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Note: This page contains sample records for the topic "distribution system reliability" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Constructing Reliable Distributed Communication Systems with CORBA  

E-Print Network [OSTI]

Constructing Reliable Distributed Communication Systems with CORBA Silvano Maffeis Douglas C Communication software and distributed services for next- generation applications must be reliable, efficient model to support reliable data- and process- oriented distributed systems that communicate through syn

Schmidt, Douglas C.

2

Reliability Assessment of Distribution Systems.  

E-Print Network [OSTI]

?? A stable and reliable electric power supply system is an inevitable pre-requisite for the technological and economic growth of any nation. Due to this,… (more)

Dorji, Tempa

2009-01-01T23:59:59.000Z

3

Reliability improvement of distribution systems using SSVR  

Science Journals Connector (OSTI)

This paper presents a reliability assessment algorithm for distribution systems using a Static Series Voltage Regulator (SSVR). Furthermore, this algorithm considers the effects of Distributed Generation (DG) units, alternative sources, system reconfiguration, load shedding and load adding on distribution system reliability indices. In this algorithm, load points are classified into 8 types and separated restoration times are considered for each class. Comparative studies are conducted to investigate the impacts of DG and alternative source unavailability on the distribution system reliability. For reliability assessment, the customer-oriented reliability indices such as SAIFI, SAIDI, CAIDI ASUI and also load- and energy-oriented indices such as ENS and AENS are evaluated. The effectiveness of the proposed algorithm is examined on the two standard distribution systems consisting of 33 and 69 nodes. The best location of the SSVR in distribution systems is determined based on different reliability indices, separately. Results show that the proposed algorithm is efficient for large-scale radial distribution systems and can accommodate the effects of fault isolation and load restoration.

Mehdi Hosseini; Heidar Ali Shayanfar; Mahmoud Fotuhi-Firuzabad

2009-01-01T23:59:59.000Z

4

A reliability assessment methodology for distribution systems with distributed generation  

E-Print Network [OSTI]

Generation and Micro-Grid Networks. v TABLE OF CONTENTS CHAPTER Page I INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . 1 A. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 1 B. Distribution System Reliability... Generation and Micro-Grid Networks. v TABLE OF CONTENTS CHAPTER Page I INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . 1 A. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 1 B. Distribution System Reliability...

Duttagupta, Suchismita Sujaya

2006-08-16T23:59:59.000Z

5

Reliability-Based Prioritizing Maintenance Policy for Distribution System  

Science Journals Connector (OSTI)

This paper presents an approach to prioritize maintenance tasks in power distribution system based on reliability models. This approach define weighted average system reliability index WASRI employing reliability indices SAIFI, SAIDI, MAIFI and interruption ... Keywords: Maintenance management, distribution reliability, reliability indices

Zhang Yong; Sun Xiaorong; Chen Hao; Fangxing Li

2010-06-01T23:59:59.000Z

6

Guest Editorial: Special Issue on Reliable Distributed Systems  

E-Print Network [OSTI]

Guest Editorial: Special Issue on Reliable Distributed Systems Shambhu J. Upadhyaya, Senior Member, designers, and implementers of distributed systems, with emphasis on system properties such as reliability with the 19th IEEE Symposium on Reliable Distributed Systems held at Nuernberg, Germany, 2000, but the topics

Firenze, UniversitĂ  degli Studi di

7

Reliability of Heterogeneous Distributed Computing Systems in the Presence  

E-Print Network [OSTI]

Reliability of Heterogeneous Distributed Computing Systems in the Presence of Correlated Failures of correlated failures are also investigated. Index Terms--Distributed computing, load balancing, reliability Jorge E. Pezoa, Member, IEEE and Majeed M. Hayat, Fellow, IEEE Abstract--While the reliability

Hayat, Majeed M.

8

Designing shipboard electrical distribution systems for optimal reliability.  

E-Print Network [OSTI]

??Analysis was performed to quantify and compare the reliability of several different notional shipboard DC distribution system topologies in serving their equipment loads. Further, the… (more)

Stevens, McKay Benjamin

2013-01-01T23:59:59.000Z

9

Dynamically Quantifying and Improving the Reliability of Distributed Storage Systems  

E-Print Network [OSTI]

Dynamically Quantifying and Improving the Reliability of Distributed Storage Systems Rekha Bachwani,ricardob}@cs.rutgers.edu {gryz,dubnicki}@nec-labs.com Abstract In this paper, we argue that the reliability of large-scale storage systems can be significantly improved by using bet- ter reliability metrics and more efficient

Bianchini, Ricardo

10

Impact of automatic switches on power distribution system reliability  

Science Journals Connector (OSTI)

In this paper quantitative impact of automatic switches on the reliability of power distribution systems is studied. Based on the characteristics of the studied system's topology, the reliability model is developed for the implementation of Monte Carlo simulation. Reliability indices on each load have been computed to obtain an overall reliability assessment of the system, and the sensitivity of the reliability indices to the location of automatic switches is also studied. Simulation results are used to illustrate the validity of the approach and are compared with the historical reliability records.

H. Zheng; Y. Cheng; B. Gou; D. Frank; A. Bern; W.E. Muston

2012-01-01T23:59:59.000Z

11

RELIABILITY PLANNING IN DISTRIBUTED ELECTRIC ENERGY SYSTEMS  

E-Print Network [OSTI]

the other hand, such distributed generators as fuel cells ordistributed and conventional. Nuclear plants and conventional coal fired generators

Kahn, E.

2011-01-01T23:59:59.000Z

12

Enhancing reliability in passive anti-islanding protection schemes for distribution systems with distributed generation.  

E-Print Network [OSTI]

??This thesis introduces a new approach to enhance the reliability of conventional passive anti-islanding protection scheme in distribution systems embedding distributed generation. This approach uses… (more)

Sheikholeslamzadeh, Mohsen

2012-01-01T23:59:59.000Z

13

Identifying Transformer Incipient Events for Maintaining Distribution System Reliability  

E-Print Network [OSTI]

Identifying Transformer Incipient Events for Maintaining Distribution System Reliability Karen L events in single-phase distribution transformers. This analysis will aid in the development of an automatic detection method for internal incipient faults in the transformers. The detection method can

14

RELIABILITY PLANNING IN DISTRIBUTED ELECTRIC ENERGY SYSTEMS  

E-Print Network [OSTI]

applied to the case of hydroelectric facilities with large3. For comparison, the hydroelectric system in California asas droughts which reduce hydroelectric energy availability,

Kahn, E.

2011-01-01T23:59:59.000Z

15

RELIABILITY PLANNING IN DISTRIBUTED ELECTRIC ENERGY SYSTEMS  

E-Print Network [OSTI]

mean value of load and its variance as follows: where W =as a function of load for a given system. This follows fromto some load W. We can write this as follows: LOLP = Prob [

Kahn, E.

2011-01-01T23:59:59.000Z

16

Distribution system reliability analysis for smart grid applications.  

E-Print Network [OSTI]

??Reliability of power systems is a key aspect in modern power system planning, design, and operation. The ascendance of the smart grid concept has provided… (more)

Aljohani, Tawfiq Masad

2014-01-01T23:59:59.000Z

17

Action Models: A Reliability Modeling Formalism for Fault-Tolerant Distributed Computing Systems  

E-Print Network [OSTI]

Action Models: A Reliability Modeling Formalism for Fault-Tolerant Distributed Computing Systems. Introduction Model-based evaluation of the reliability of distributed systems has traditionally required expert- proach to analyze the reliability of fault-tolerant distributed systems. More in particular, we want

Newcastle upon Tyne, University of

18

Differential evolution applied for reliability optimization of radial distribution systems  

Science Journals Connector (OSTI)

This paper describes a methodology for reliability enhancement of radial distribution system by determining optimal values of repair times and failure rates of each section. Penalty cost functions have been constructed as function of failure rates and repair times. Constraints on customer and energy based indices, i.e. SAIFI, SAIDI, CAIDI and AENS have been considered. The problem has been decomposed in two stages. One stage determines the optimum failure rates and second stage optimizes repair times satisfying constraints. A population based approach, i.e. differential evolution (DE) has been used as optimization technique. The algorithm has been implemented on a sample test system. Results obtained have been compared with those obtained using particle swarm optimization (PSO) and co-ordinated aggregation based particle swarm optimization techniques (CAPSO).

L.D. Arya; S.C. Choube; Rajesh Arya

2011-01-01T23:59:59.000Z

19

Performance and Reliability of Non-Markovian Heterogeneous Distributed Computing Systems  

E-Print Network [OSTI]

Performance and Reliability of Non-Markovian Heterogeneous Distributed Computing Systems Jorge E-of-service (QoS), and service reliability associated with heterogeneous parallel and distributed computing-Markovian processes, distributed queuing theory, reliability, distributed computing, load balancing. Ă? 1 INTRODUCTION

Hayat, Majeed M.

20

A continuous distribution method for reliability evaluation of interconnected power systems.  

E-Print Network [OSTI]

??Recursive algorithms and approximations using continuous distributions are the two basic techniques for reliability calculations of generation systems. Within assumptions common to both methodologies, recursive… (more)

Chintaluri, Gouri Mohana

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "distribution system reliability" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Task allocation for maximizing reliability of distributed computing systems using honeybee mating optimization  

Science Journals Connector (OSTI)

This paper deals with the problem of task allocation (i.e., to which processor should each task of an application be assigned) in heterogeneous distributed computing systems with the goal of maximizing the system reliability. The problem of finding an ... Keywords: Distributed computing, Honeybee mating optimization, Reliability, Task assignment

Qin-Ma Kang; Hong He; Hui-Min Song; Rong Deng

2010-11-01T23:59:59.000Z

22

Reliability Improvement Programs in Steam Distribution and Power Generation Systems  

E-Print Network [OSTI]

In the reliability and efficiency of the system. Recent studies have shownt hat more than 40% of all In stalled steam traps and 20% of certain types of valves need some form of corrective action. The majority of all high backpressure problems In condensate return... of the early 80's, energ~ I conservation was a buzzword. Excess funds were avall,8ble for high ROI projects and capital improvements were rpade to gain production efficiency. The increase in energy tosts and consumer spending triggered a moderate Increase...

Petto, S.

23

A Scheme for Reliable Delivery of Events in Distributed Middleware Systems Shrideep Pallickara and Geoffrey Fox  

E-Print Network [OSTI]

A Scheme for Reliable Delivery of Events in Distributed Middleware Systems Shrideep Pallickara. These interactions can be encapsulated in events. We describe a scheme for the reliable delivery of events. In this paper we describe our scheme for the reliable delivery of events within NaradaBrokering [1, 2], which

24

Installation of PV systems in Greece—Reliability improvement in the transmission and distribution system  

Science Journals Connector (OSTI)

Photovoltaic (PV) power systems are becoming one of the most developing investment areas in the field of Renewable Energy Sources (RES). A statement of the status quo of PV power systems in Greece, and their contribution towards the improvement of power system reliability, is the scope of the present paper. Siting and installation of PV power systems is performed according to a recent Greek law, along with environmental and geographical constraints. Meteorological data are computed, formulated and imported to appropriate software in order to simulate the PV units and generate their power output. Data for unserved loads, resulting from load shedding during peak hours, are compared to the above estimated power production. Assuming that a proportion of the eventually unsupplied power could be provided by the accessed power generation of the PV units, the reliability of both transmission and distribution system is improved. The impact on the transmission system is shown by an improvement of LOLP and LOEP indices, whereas peak shaving for the Interconnected Greek Transmission System (IGTS) is also illustrated. For the distribution system the impact is quantified using the distribution system reliability indices SAIDI, SAIFI, and CAIDI. Finally, the resulting improvement is also expressed in financial terms.

Aggelos S. Bouhouras; Antonios G. Marinopoulos; Dimitris P. Labridis; Petros S. Dokopoulos

2010-01-01T23:59:59.000Z

25

A Bi-Criteria Scheduling Heuristics for Distributed Embedded Systems under Reliability and Real-Time Constraints  

E-Print Network [OSTI]

A Bi-Criteria Scheduling Heuristics for Distributed Embedded Systems under Reliability and Real are met. Keywords: Distributed real-time systems, safety-critical systems, reliability, multi-time distributed systems in the literature do not attempt to introduce reliability; rather, they concentrate

Girault, Alain

26

A BiCriteria Scheduling Heuristics for Distributed Embedded Systems under Reliability and RealTime Constraints  

E-Print Network [OSTI]

A Bi­Criteria Scheduling Heuristics for Distributed Embedded Systems under Reliability and Real are met. Keywords: Distributed real­time systems, safety­critical systems, reliability, multi­time distributed systems in the literature do not attempt to introduce reliability; rather, they concentrate

Girault, Alain

27

Reliability analysis of urban gas transmission and distribution system based on FMEA and correlation operator  

Science Journals Connector (OSTI)

In order to improve the safety management of urban gas transmission and distribution system, failure mode and effects analysis (FMEA) was used to construct the reliability analysis ... the risk priority number (R...

Su Li; Weiguo Zhou

2014-12-01T23:59:59.000Z

28

Application of fault tree analysis for customer reliability assessment of a distribution power system  

Science Journals Connector (OSTI)

A new method is developed for predicting customer reliability of a distribution power system using the fault tree approach with customer weighted values of component failure frequencies and downtimes. Conventional customer reliability prediction of the electric grid employs the system average (SA) component failure frequency and downtime that are weighted by only the quantity of the components in the system. These SA parameters are then used to calculate the reliability and availability of components in the system, and eventually to find the effect on customer reliability. Although this approach is intuitive, information is lost regarding customer disturbance experiences when customer information is not utilized in the SA parameter calculations, contributing to inaccuracies when predicting customer reliability indices in our study. Hence our new approach directly incorporates customer disturbance information in component failure frequency and downtime calculations by weighting these parameters with information of customer interruptions. This customer weighted (CW) approach significantly improves the prediction of customer reliability indices when applied to our reliability model with fault tree and two-state Markov chain formulations. Our method has been successfully applied to an actual distribution power system that serves over 2.1 million customers. Our results show an improved benchmarking performance on the system average interruption frequency index (SAIFI) by 26% between the SA-based and CW-based reliability calculations.

Fariz Abdul Rahman; Athi Varuttamaseni; Michael Kintner-Meyer; John C. Lee

2013-01-01T23:59:59.000Z

29

Abstract--The reliability and quality of power distribution systems are usually affected by many different distribution faults.  

E-Print Network [OSTI]

1 Abstract--The reliability and quality of power distribution systems are usually affected by many different distribution faults. Tree-caused faults are one of the major fault causes. In this paper, four to analyze the characteristics of tree-caused distribution faults. This paper also uses statistical

Chow, Mo-Yuen

30

Parametric probability distributions in reliability  

E-Print Network [OSTI]

Parametric probability distributions in reliability F.P.A. Coolen Department of Mathematical parametric probability distributions which are frequently used in reliability. We present some main as models for specific reliability scenarios. Keywords: Binomial distribution, Exponential distribution

Coolen, Frank

31

Reliability modeling of transmission and distribution systems including dependent failures  

E-Print Network [OSTI]

is considered. Therefore, the trans i t ion rate mat r i x of the entire system need not be generated. Th i s method is compared wi th the sequential method for normal and stormy weather condit ions, and is then extended to include m weather conditions... . 9 E . Cut -Set Equations 10 III M A R K O V C U T - S E T M E T H O D 13 A . Basic Approach 13 B . Markov Cut -Set Me thod 13 C . Examp le 18 D . Compar ison wi th the Sequential Me thod 22 E . Cut-Sets w i th m Weather States 24 F . Extens...

Beydoun, Rami Sami

2012-06-07T23:59:59.000Z

32

Fault-Tolerant Reliable Delivery of Messages in Distributed Publish/Subscribe Systems Shrideep Pallickara, Hasan Bulut and Geoffrey Fox  

E-Print Network [OSTI]

1/10 Fault-Tolerant Reliable Delivery of Messages in Distributed Publish/Subscribe Systems Shrideep in distributed systems. In this paper we present our strategy to enable reliable delivery of messages University Abstract Reliable delivery of messages is an important problem that needs to be addressed

33

Fault Tolerant Reliable Delivery of Events in Distributed Middleware Systems Shrideep Pallickara, Geoffrey Fox and Hasan Bulut  

E-Print Network [OSTI]

Fault Tolerant Reliable Delivery of Events in Distributed Middleware Systems Shrideep Pallickara our scheme for the reliable delivery of events within NaradaBrokering [1-5], which is a distributed Abstract Reliable delivery of events (or messages, where the terms messages and events are used

34

A nonlinear binary programming model for electric distribution systems reliability optimization  

Science Journals Connector (OSTI)

This paper presents a new nonlinear binary programming model aiming to minimize the SAIDI and SAIFI reliability indices of a distribution feeder. Graph theory and a contingency simulation-based technique are used in the explicit formulation of the objective functions to accurately model the protection system response to faults and system reconfiguration practices. To ensure the solution’s feasibility both technical and economic constraints are considered. An alternative economic constraint is proposed, taking into account the current locations of the protective devices and sectionalizing switches, which directly affect the utility costs for reliability improvement. To solve the proposed model, an optimization technique based on the branch-and-bound algorithm is used in this paper. Hence, this technique enables deterministic optimization of distribution feeder reliability by identifying types and locations of protection devices and sectionalizing switches, so that SAIDI and SAIFI reliability indices are minimized. Test cases are presented to illustrate the reliability optimization of a test feeder considering the use of different protection schemes and cost constraints. A value-based reliability optimization formulation is derived from the proposed model and its application to the test feeder is also illustrated. Additionally, the solutions obtained from the proposed model are compared with the solutions obtained from two other state-of-the-art models found in the literature. A comparative study is also carried out to evaluate the efficiency of the genetic algorithm in solving the proposed models.

G.D. Ferreira; A.S. Bretas

2012-01-01T23:59:59.000Z

35

Reliability Optimization of Radial Distribution Systems Employing Differential Evolution and Bare Bones Particle Swarm Optimization  

Science Journals Connector (OSTI)

Various customer oriented reliability indices being used frequently by distribution utilities are SAIFI, SAIDI and CAIDI. They are defined...1]:

K. B. Kela; L. D. Arya

2014-09-01T23:59:59.000Z

36

IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 16, NO. 1, FEBRUARY 2001 111 Reliability and Costs Optimization for Distribution  

E-Print Network [OSTI]

methodology, using an evolutionary algorithm, for finding out the best distribution network reliability whileIEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 16, NO. 1, FEBRUARY 2001 111 Reliability and Costs Optimization for Distribution Networks Expansion Using an Evolutionary Algorithm Ignacio J. RamĂ­rez

Coello, Carlos A. Coello

37

Using the negative log-gamma distribution for Bayesian system reliability assessment.  

E-Print Network [OSTI]

??Modeling system reliability over time when binary data are collected both at the system and component level has been the subject of many papers. In… (more)

Zoh, Roger

2012-01-01T23:59:59.000Z

38

Proceedings of the 23rd IEEE International Symposium on Reliable Distributed Systems (SRDS'04) 1060-9857/04 $ 20.00 IEEE  

E-Print Network [OSTI]

Proceedings of the 23rd IEEE International Symposium on Reliable Distributed Systems (SRDS'04) 1060-9857/04 $ 20.00 IEEE #12;Proceedings of the 23rd IEEE International Symposium on Reliable Distributed Systems Symposium on Reliable Distributed Systems (SRDS'04) 1060-9857/04 $ 20.00 IEEE #12;Proceedings of the 23rd

Reiter, Michael

39

Proceedings of the 22nd International Symposium on Reliable Distributed Systems (SRDS'03) 1060-9857/03 $17.00 2003 IEEE  

E-Print Network [OSTI]

Proceedings of the 22nd International Symposium on Reliable Distributed Systems (SRDS'03) 1060-9857/03 $17.00 © 2003 IEEE #12;Proceedings of the 22nd International Symposium on Reliable Distributed Systems on Reliable Distributed Systems (SRDS'03) 1060-9857/03 $17.00 © 2003 IEEE #12;Proceedings of the 22nd

Reiter, Michael

40

Repair duration effects on distribution system reliability indices and customer outage costs.  

E-Print Network [OSTI]

??The distribution system is part of the electric power system that links the bulk transmission system and the individual customers. Approximately 80 percent of outages… (more)

Shakya, Binendra

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "distribution system reliability" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Distribution reliability analysis.  

E-Print Network [OSTI]

??This thesis presents an example for optimization of distribution maintenance scheduling of a recloser. It applies a risk reduction technique associated with maintenance of the… (more)

Bhusal, Prabodh

2007-01-01T23:59:59.000Z

42

Reliability of lightning resistant overhead distribution lines  

SciTech Connect (OSTI)

An assessment of the 32 year historical reliability of the 13.8 kV electrical distribution system at the Oak Ridge National Laboratory (ORNL) in Tennessee has yielded several conclusions useful In the planning of Industrial power Systems. The system configuration at ORNL has essentially remained unchanged in the last 32 years which allows a meaningful comparison of reliability trends for the plant`s eight overhead distribution lines, two of which were built in the 1960`s with lightning resistant construction techniques. Meticulous records indicating the cause, duration, and location of 135 electric outages in the plant`s distribution system have allowed a reliability assessment to be performed. The assessment clearly shows how differences in voltage construction class, length, age, and maximum elevation above a reference elevation influence the reliability of overhead power distribution lines. Comparisons are also made between the ORNL historical data and predicted failure rates from ANSI and IEEE industry surveys.

Tolbert, L.M.; Cleveland, J.T.; Degenhardt, L.J.

1995-04-01T23:59:59.000Z

43

IEEE TRANSACTIONS ON RELIABILITY, VOL. 38, NO. 1,1989 APRIL 103 Reliable Protocols for Distributed  

E-Print Network [OSTI]

IEEE TRANSACTIONS ON RELIABILITY, VOL. 38, NO. 1,1989 APRIL 103 Reliable Protocols for Distributed-tolerance, Message complexity, Reliable protocol Reader Aids - Purpose: Design reliable distributed protocols Special Termination Detection S. Venkatesan University of Pittsburgh, Pittsburgh Key Words - Distributed system, Fault

Venkatesan, S.

44

A study of the reliability of Stirling engines for distributed receiver systems  

SciTech Connect (OSTI)

The objective of this study was to examine the reliability of existing and improved Stirling engine concepts for dispersed solar dish/electric applications in the 25--50 kW/sub e/ range. Five current kinematic Stirling engine designs have the capability to meet or exceed the 32% system efficiency goal of the DOE Solar Thermal Program. Experience with the Vanguard Solar-Dish/Stirling Engine module demonstrated that the 32% efficiency goal is realistic, but that improved Stirling engine reliability is necessary for successful implementation of dispersed solar power systems. A review of historical Stirling engine data illustrated that the three major reliability issues with kinematic Stirling engines are the piston-rod seals, engine hot parts and power control/drive systems. A specific kinematic engine concept that appears to have the potential for meeting the 50,000-hour operating lifetime requirement of solar power systems has a pressurized crankcase to reduce piston-rod seal problems, an indirectly heated hot-end section using heat pipes to smooth out temperature gradients in the heater tubes, and a variable-angle swashplate for power control. Further development efforts are required to establish reliability and validate performance goals of these engine concepts. 30 refs., 13 figs., 8 tabs.

Holtz, R.E.; Uherka, K.L.

1988-11-01T23:59:59.000Z

45

Power Distribution System Reliability Evaluation Using Both Analytical Reliability Network Equivalent Technique and Time-sequential Simulation Approach  

Science Journals Connector (OSTI)

System average interruption frequency index (SAIFI) [7.6]: (7.4) ...$ \\label{eq:7-4} \\text{\\tex...

Peng Wang; Lalit Goel

2010-01-01T23:59:59.000Z

46

Hawaii electric system reliability.  

SciTech Connect (OSTI)

This report addresses Hawaii electric system reliability issues; greater emphasis is placed on short-term reliability but resource adequacy is reviewed in reference to electric consumers' views of reliability %E2%80%9Cworth%E2%80%9D and the reserve capacity required to deliver that value. The report begins with a description of the Hawaii electric system to the extent permitted by publicly available data. Electrical engineering literature in the area of electric reliability is researched and briefly reviewed. North American Electric Reliability Corporation standards and measures for generation and transmission are reviewed and identified as to their appropriateness for various portions of the electric grid and for application in Hawaii. Analysis of frequency data supplied by the State of Hawaii Public Utilities Commission is presented together with comparison and contrast of performance of each of the systems for two years, 2010 and 2011. Literature tracing the development of reliability economics is reviewed and referenced. A method is explained for integrating system cost with outage cost to determine the optimal resource adequacy given customers' views of the value contributed by reliable electric supply. The report concludes with findings and recommendations for reliability in the State of Hawaii.

Silva Monroy, Cesar Augusto; Loose, Verne William

2012-09-01T23:59:59.000Z

47

IEEE TRANSACTIONS ON RELIABILITY, VOL. 54, NO. 3, SEPTEMBER 2005 421 Reliability Optimization of Distributed Access  

E-Print Network [OSTI]

of the SSA. Index Terms--Branch and bound, distributed access networks, optimization, system reliabilityIEEE TRANSACTIONS ON RELIABILITY, VOL. 54, NO. 3, SEPTEMBER 2005 421 Reliability Optimization of Distributed Access Networks With Constrained Total Cost Fang-Ming Shao, Xuemin (Sherman) Shen, Senior Member

Shen, Xuemin "Sherman"

48

Measuring Improved Reliability in Stochastic Systems  

E-Print Network [OSTI]

for such a path, this represents a better measure of the path's reliability. If the distribution were asymmetricMeasuring Improved Reliability in Stochastic Systems Jeremy Bradley \\Lambda Neil Davies y 30 June 1999 Abstract In this paper, we examine reliability of stochastic systems with specific application

Bradley, Jeremy

49

TRANSACTIONS ON PARALLEL AND DISTRIBUTED COMPUTING 1 Reliability of Heterogeneous Distributed  

E-Print Network [OSTI]

TRANSACTIONS ON PARALLEL AND DISTRIBUTED COMPUTING 1 Reliability of Heterogeneous Distributed, Senior Member, IEEE Abstract--While the reliability of distributed-computing systems (DCSs) has been group 1 INTRODUCTION TRADITIONALLY, the problem of modeling and ana- lyzing reliability in distributed

Hayat, Majeed M.

50

Reliability assessment in active distribution networks with detailed effects of PV systems  

Science Journals Connector (OSTI)

A micro-grid is a cluster of distributed generators and...2]. The micro-grids are typically designed for bi-mode of ... operating in the grid connected mode, the micro-grid interchangeably imports and exports pow...

Zulu ESAU; Dilan JAYAWEERA

2014-03-01T23:59:59.000Z

51

Reliability enhancement using optimal distribution feeder reconfiguration  

Science Journals Connector (OSTI)

Failure statistics show that distribution networks engage the most contribution to the customer unavailability services. Optimal reconfiguration of distribution systems has many advantages like total power losses reduction, voltage profile enhancement, reliability improvement and so on. Therefore, in this paper a new multiobjective improved shuffled frog leaping algorithm (ISFLA) is proposed to investigate the distribution feeder reconfiguration (DFR) problem from the reliability enhancement point of view. Nevertheless, since the total cost of MW loss is an important and attractive subject to the electric power utilities, the total active power losses is also considered as an objective function in the investigations. Therefore, the objective functions of the problem to be optimized are system average interruption frequency index (SAIFI), system average interruption duration index (SAIDI), average energy not supplied (AENS) and the total active power losses. During the optimization process, the proposed ISFLA finds a set of non-dominated optimal solutions referred to Pareto optimal solutions that are kept in an external memory called repository. As the result of the conflicting behavior of the objective functions investigated, a fuzzy clustering technique is employed to control the size of the repository in the predetermined limits. The feasibility and the efficiency of the proposed method are examined by a standard distribution test system.

Abdollah Kavousi-Fard; Mohammad-Reza Akbari-Zadeh

2013-01-01T23:59:59.000Z

52

The design of a reliable reputation system  

E-Print Network [OSTI]

a peer reliability metric based on the distribution ofa higher reliability score. The most reliable distribution,distribution for the Sybil colluder and a sharp drop in its reliability

Swamynathan, Gayatri; Almeroth, Kevin C.; Zhao, Ben Y.

2010-01-01T23:59:59.000Z

53

FIELD RELIABILITY OF ELECTRONIC SYSTEMS  

E-Print Network [OSTI]

: ELECTRONIC EQUIPMENT; FAILURES; RELIABILITY; RISK ANALYSIS; SYSTEM ANALYSIS UDC: 621.38.004.64 ISBN 87 Predicted and Observed Reliability 16 3.3. Source 3 16 3.3.1. Description (Reactor Gamma Monitor) 16 3I Ww i 1 i FIELD RELIABILITY OF ELECTRONIC SYSTEMS wcwotoias R I S 0 - M - 2 4 1 8 An analytical

54

Reliable Deployment of Component-based Applications into Distributed Environments  

E-Print Network [OSTI]

Reliable Deployment of Component-based Applications into Distributed Environments Abbas Heydarnoori's quality of service properties such as reliability. In distributed sys- tems, the reliability that should be deployed into a large distributed en- vironment, several deployment configurations are typ

Czarnecki, Krzysztof

55

Reliability enhancement of a radial distribution system using coordinated aggregation based particle swarm optimization considering customer and energy based indices  

Science Journals Connector (OSTI)

This paper describes an algorithm for optimum modifications for failure rate and repair time for a radial electrical distribution system. The modifications are with respect to a penalty cost function minimization. The cost function has been minimized subject to the energy based and customer oriented indices, i.e. AENS, SAIFI, SAIDI and CAIDI. Coordinated aggregation based particle swarm optimization (CAPSO) has been used for optimization. The algorithm has been implemented on a sample radial distribution system. The results obtained have been compared with those obtained using PSO.

Rajesh Arya; S.C. Choube; L.D. Arya; D.P. Kothari

2012-01-01T23:59:59.000Z

56

Hybrid Control Network Intrusion Detection Systems for Automated Power Distribution Systems  

E-Print Network [OSTI]

and improve the reliability of the distribution system [3].distribution topology for protection and to improve reliability.

Parvania, Masood; Koutsandria, Georgia; Muthukumar, Vishak; Peisert, Sean; McParland, Chuck; Scaglione, Anna

2014-01-01T23:59:59.000Z

57

Reliability and Functional Availability of HVAC Systems  

E-Print Network [OSTI]

This paper presents a model to calculate the reliability and availability of heating, ventilation and air conditioning systems. The reliability is expressed in the terms of reliability, maintainability and decision capability. These terms are a...

Myrefelt, S.

2004-01-01T23:59:59.000Z

58

A model and framework for reliable build systems Derrick Coetzee  

E-Print Network [OSTI]

A model and framework for reliable build systems Derrick Coetzee Anand Bhaskar George Necula, requires prior specific permission. #12;A model and framework for reliable build systems Derrick Coetzee- distributed, incremental, parallel build systems. We de- fine a general model for resources accessed by build

Necula, George

59

Microgrids and Heterogeneous Security, Quality, Reliability, and Availability  

E-Print Network [OSTI]

and Energy Reliability, Distribution System Integrationand Energy Reliability, Distribution System Integration

Marnay, Chris

2007-01-01T23:59:59.000Z

60

Reliability evaluation of smart distribution grids.  

E-Print Network [OSTI]

??The term "Smart Grid" generally refers to a power grid equipped with the advanced technologies dedicated for purposes such as reliability improvement, ease of control… (more)

Kazemi, Shahram

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "distribution system reliability" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Information Concerning Reliability Impacts under Various System...  

Broader source: Energy.gov (indexed) [DOE]

Impacts under Various System Configurations of the Mirant Potomac River Plant Information Concerning Reliability Impacts under Various System Configurations of the Mirant...

62

On Optimization of Reliability of Distributed Generation-Enhanced Feeders  

Science Journals Connector (OSTI)

Placement of protection devices in a conventionalfeeder (without distributed generation) is often performedso as to minimize traditional reliability indices (SAIDI,SAIFI, MAIFIe...), assuming the sole source(s) of energyat substation(s). Distributed ...

A. Pregelj; M. Begovic; A. Rohatgi; D. Novosel

2003-01-01T23:59:59.000Z

63

Definition: Reliability Coordinator Information System | Open Energy  

Open Energy Info (EERE)

Reliability Coordinator Information System Reliability Coordinator Information System Jump to: navigation, search Dictionary.png Reliability Coordinator Information System The system that Reliability Coordinators use to post messages and share operating information in real time.[1] Related Terms Reliability Coordinator References ↑ Glossary of Terms Used in Reliability Standards An LikeLike UnlikeLike You like this.Sign Up to see what your friends like. inline Glossary Definition Retrieved from "http://en.openei.org/w/index.php?title=Definition:Reliability_Coordinator_Information_System&oldid=480407" Categories: Definitions ISGAN Definitions What links here Related changes Special pages Printable version Permanent link Browse properties 429 Throttled (bot load) Error 429 Throttled (bot load) Throttled (bot load)

64

Reliability Assessment of a Power Grid with Customer Operated CHP Systems Using Monte Carlo Simulation.  

E-Print Network [OSTI]

??This thesis presents a method for reliability assessment of a power grid with distributed generation providing support to the system. The distributed generation units considered… (more)

Manohar, Lokesh Prakash

2009-01-01T23:59:59.000Z

65

Fault-Tolerant Reliable Delivery of Messages in Distributed Publish/Subscribe Shrideep Pallickara, Hasan Bulut and Geoffrey Fox  

E-Print Network [OSTI]

Fault-Tolerant Reliable Delivery of Messages in Distributed Publish/Subscribe Systems Shrideep)@indiana.edu Abstract Reliable delivery of messages is an important problem that needs to be addressed in distributed systems. In this paper we briefly describe our basic strategy to enable reliable delivery of messages

66

Substation reliability -- Practical application and system approach  

SciTech Connect (OSTI)

Practical application of reliability analysis was made for the comparison of alternate line and bus arrangements of a future transmission substation with potential savings of up to $3.6 M. The paper describes how both the substation and the power system were simulated by using computer programs STAREL and COMREL. It presents the method used to obtain the most accurate estimates for the outage data of the system components. Finally, it expresses the results with simple reliability indices which can be meaningful for management. The results of the study show the need to include the reliability of the transmission system in a substation reliability evaluation.

Save, P. [Southern California Edison Co., Rosemead, CA (United States)] [Southern California Edison Co., Rosemead, CA (United States)

1995-02-01T23:59:59.000Z

67

Substation reliability -- Practical application and system approach  

SciTech Connect (OSTI)

Practical application of reliability analysis was made for the comparison of alternate line and bus arrangements of a future transmission substation with potential savings of up to 53.6 M. The paper describes how both the substation and the power system were simulated by using computer programs STAREL and COMREL. It presents the method used to obtain the most accurate estimates for the outage data of the system components. Finally, it expresses the results with simple reliability indices which can be meaningful for management. The results of the study show the need to include the reliability of the transmission system in a substation reliability evaluation.

Save, P. [Southern California Edison Co., Rosemead, CA (United States)

1994-12-31T23:59:59.000Z

68

inferences on stress-strength reliability from lindley distributions  

E-Print Network [OSTI]

inferences on stress-strength reliability from lindley distributions D.K. Al-Mutairi , M.E. Ghitany minimum variance unbiased estimator has explicit expression, however, its exact or asymptotic distribution be obtained in explicit form. We obtain the asymptotic distribution of the maximum likelihood estimator

Kundu, Debasis

69

Information Concerning Reliability Impacts under Various System  

Broader source: Energy.gov (indexed) [DOE]

Information Concerning Reliability Impacts under Various System Information Concerning Reliability Impacts under Various System Configurations of the Mirant Potomac River Plant Information Concerning Reliability Impacts under Various System Configurations of the Mirant Potomac River Plant Docket No. EO-05-01: PJM Interconnection, L.L.C. and PEPCO Holdings, Inc. is hereby providing you with additional information concerning reliability impacts under various system conditions associated with the unavailability of the Potomac River Generating Station to serve load in the D.C. area. Also enclosed as part of this submittal is material provided by PEPCO (balance of sentence redacted) In addition, there is a discussion concerning the impacts of demand side response in addressing this situation. Information Concerning Reliability Impacts under Various System

70

Uncovering the Distribution of Motorists' Preferences for Travel Time and Reliability: Implications for Road Pricing  

E-Print Network [OSTI]

estimate distributions of the values of time and reliabilityDISTRIBUTION OF MOTORISTS' PREFERENCES FOR TRAVEL TIME AND RELIABILITY:and reliability, we maintain that they consider both the central tendency and the dispersion of that distribution.

Small, Kenneth A; Winston, Clifford; Yan, Jia

2002-01-01T23:59:59.000Z

71

Distributed Energy Resources for Carbon Emissions Mitigation  

E-Print Network [OSTI]

and Energy Reliability, Distribution System Integrationand Energy Reliability, Distribution System Integration

Firestone, Ryan; Marnay, Chris

2008-01-01T23:59:59.000Z

72

Development in structural systems reliability theory  

Science Journals Connector (OSTI)

This paper is concerned with two topics on structural systems reliability theory. One covers automatic generation of failure mode equations, identifications of stochastically dominant failure modes, and reliability assessment of redundant structures. Reduced stiffness matrixes and equivalent nodal forces representing the failed elements are introduced for expressing the safety margins of the elements, using a matrix method. Dominant failure modes are systematically selected by a branch-and-bound technique and heuristic operations. The other discusses the various optimum design problems based on reliability concept. Those problems are interpreted through a solution to a multi-objective optimization problem.

Y. Murotsu

1986-01-01T23:59:59.000Z

73

Understanding Bulk Power Reliability: The Importance of Good Data and A Critical Review of Existing Sources  

E-Print Network [OSTI]

for Electric Power Distribution Reliability Indices. ISBN 0-to report distribution system reliability for each dataset

Fisher, Emily

2012-01-01T23:59:59.000Z

74

Reliable Link Maintenance in Cognitive Radio Systems  

E-Print Network [OSTI]

resources and overcome the under-utilization of licensed spectrum. Since the licensed user still keeps) have to vacate the spectrum in case the licensed user claims it. In order to maintain the qualityReliable Link Maintenance in Cognitive Radio Systems Daniel Willkomm, James Gross and Adam Wolisz

Gross, James

75

Combined Heat and Power System Enables 100% Reliability at Leading...  

Broader source: Energy.gov (indexed) [DOE]

Enables 100% Reliability at Leading Medical Campus - Case Study, 2013 Combined Heat and Power System Enables 100% Reliability at Leading Medical Campus - Case Study, 2013 Thermal...

76

Compound Poisson approximation in systems reliability A.D. Barbour, University of Zurich,  

E-Print Network [OSTI]

in clusters, W may be better approximated by a compound Poisson distribution, and the reliability IP[W = 0Compound Poisson approximation in systems reliability A.D. Barbour, University of Z¨urich, Ourania `local' formulation of the Stein-Chen method is applied to problems in reliability theory. Bounds

Barbour, Andrew

77

Reliability Improvements from the Application of Distribution Automation Technologies - Initial Results  

Broader source: Energy.gov (indexed) [DOE]

U.S. Department of Energy | December 2012 Table of Contents Executive Summary ................................................................................................................. ii 1. Introduction ..................................................................................................................... 1 1.1 Purpose and Scope ....................................................................................................... 1 1.2 Background on Electric Distribution Reliability ............................................................ 2 1.3 Organization of this Report .......................................................................................... 3 2. Overview of Systems, Devices, and Expected Benefits...................................................... 4

78

Software Reliability Cases: The Bridge Between Hardware, Software and System Safety and Reliability  

SciTech Connect (OSTI)

High integrity/high consequence systems must be safe and reliable; hence it is only logical that both software safety and software reliability cases should be developed. Risk assessments in safety cases evaluate the severity of the consequences of a hazard and the likelihood of it occurring. The likelihood is directly related to system and software reliability predictions. Software reliability cases, as promoted by SAE JA 1002 and 1003, provide a practical approach to bridge the gap between hardware reliability, software reliability, and system safety and reliability by using a common methodology and information structure. They also facilitate early insight into whether or not a project is on track for meeting stated safety and reliability goals, while facilitating an informed assessment by regulatory and/or contractual authorities.

Herrmann, D.S.; Peercy, D.E.

1999-01-08T23:59:59.000Z

79

System reliability: An example of nuclear reactor system analysis  

Science Journals Connector (OSTI)

This paper presents an overview of the three reliability investigations of a 900 \\{MWe\\} reactor residual heat removal system. Following a description of the system and its functions, the main procedures used in operational reliability analysis, based on the analysis of occurence records, are covered. The second part of the investigations covers predicted reliability, involving the use of the Markov method. It will be noted that the two types of analysis are in good agreement, the probability of system loss after two months' operation being of the order of 10?1. Additional investigation data are also given.

R. Coudray; J.M. Mattei

1984-01-01T23:59:59.000Z

80

Is "Spike" a Reliable Feature in Porb Distribution of AM HER Stars?  

E-Print Network [OSTI]

Orbital periods in AM Her stars (polars) are synchronized with spin periods of white dwarf by its high magnetic field. Since the last study of Porb distribution of these systems, the number of known objects of such type has more than doubled. This challenged us to compile a new updated catalogue of cataclysmic variables with highly magnetic white dwarfs (polars) and to study their Porb distribution. In this paper we also discus if "spike" is reliable feature in the distribution. ("Spike" is a concentration of polars in the distribution of their orbital periods near Porb = 114 min and was previously discussed by Ritter & Kolb (1992) and Shahbaz & Wood (1996).)

Alex Golovin; Mykola Malygin; Elena Pavlenko

2008-08-12T23:59:59.000Z

Note: This page contains sample records for the topic "distribution system reliability" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

RSVC: A Reliable Distributed Control Software Development Toolkit Control Software Group  

E-Print Network [OSTI]

RSVC: A Reliable Distributed Control Software Development Toolkit Jie Chen Control Software Group- velop a toolkit for building reliable and fault-tolerant distributed software. This paper describes a C++ toolkit (RSVC) that reduces e ort of development of reliable distributed control software. Keywords

Mao, Weizhen

82

Burr-XII Distribution Parametric Estimation and Estimation of Reliability of Multicomponent Stress-Strength  

E-Print Network [OSTI]

1 Burr-XII Distribution Parametric Estimation and Estimation of Reliability of Multicomponent-strength reliability by assuming the Burr-XII distribution. The research methodology adopted here is to estimate. By using real data sets we well illustrate the procedure. Key Words: Burr-XII distribution, reliability

Kundu, Debasis

83

Libra: A Library for Reliable Distributed Applications Jinsong Ouyang and Gernot Heiser  

E-Print Network [OSTI]

Libra: A Library for Reliable Distributed Applications Jinsong Ouyang and Gernot Heiser School to support efficient reliable distributed applications. libra is designed to meet two objectives: to simplify the development of reliable distributed applications, and to achieve fault­tolerance at low run­time cost

Heiser, Gernot

84

Computing Reliability Distributions of Windowed Max-log-map (MLM) Detectors : ISI Channels  

E-Print Network [OSTI]

Computing Reliability Distributions of Windowed Max-log-map (MLM) Detectors : ISI Channels Fabian provide exact expressions for both i) the joint distribution of the MLM symbol reliabilities, and ii--detection, intersymbol inteference, max-log- map, probability distribution, reliability I. INTRODUCTION The max

Kavcic, Aleksandar

85

Hybrid reliability model for nuclear reactor safety system  

Science Journals Connector (OSTI)

The dependability of critical safety systems needs to be quantitatively determined in order to verify their effectiveness, e.g. with regard to regulatory requirements. Since modular redundant safety systems are not required for normal operation, their reliability is strongly dependent on periodic inspection. Several modeling methods for the quantitative assessment of dependability are described in the literature, with a broad variation in complexity and modeling power. Static modeling techniques such as fault tree analysis (FTA) or reliability block diagrams (RBD) are not capable of capturing redundancy and repair or test activities. Dynamic state space based models such as continuous time Markov chains (CTMC) are more powerful but often result in very large, intractable models. Moreover, exponentially distributed state residence times are not a correct representation of actual residence times associated with repair activities or periodic inspection. In this study, a hybrid model combines a system level RBD with a CTMC to describe the dynamics. The effects of periodic testing are modeled by redistributing state probabilities at deterministic test times. Applying the method to the primary safety shutdown system of the BR2(Belgian Reactor 2)—nuclear research reactor, resulted in a quantitative as well as a qualitative assessment of its reliability.

Steven Verlinden; Geert Deconinck; Bernard Coupé

2012-01-01T23:59:59.000Z

86

We present two systems, reliable sockets (rocks) and reliable packets (racks), that provide transparent network connection  

E-Print Network [OSTI]

Abstract We present two systems, reliable sockets (rocks) and reliable packets (racks of the connection changes IP address, with correct recovery of in-flight data. To allow rocks and racks Protocol that enables the remote detection of rocks and racks, or any other socket enhancement system

Miller, Barton P.

87

FRIB cryogenic distribution system  

SciTech Connect (OSTI)

The Michigan State University Facility for Rare Isotope Beams (MSU-FRIB) helium distribution system has been revised to include bayonet/warm valve type disconnects between each cryomodule and the transfer line distribution system, similar to the Thomas Jefferson National Accelerator Facility (JLab) and the Spallation Neutron Source (SNS) cryogenic distribution systems. The heat loads at various temperature levels and some of the features in the design of the distribution system are outlined. The present status, the plans for fabrication, and the procurement approach for the helium distribution system are also included.

Ganni, Venkatarao [JLAB; Dixon, Kelly D. [JLAB; Laverdure, Nathaniel A. [JLAB; Knudsen, Peter N. [JLAB; Arenius, Dana M. [JLAB; Barrios, Matthew N. [Michigan State; Jones, S. [Michigan State; Johnson, M. [Michigan State; Casagrande, Fabio [Michigan State

2014-01-01T23:59:59.000Z

88

FRIB cryogenic distribution system  

SciTech Connect (OSTI)

The Michigan State University Facility for Rare Isotope Beams (MSU-FRIB) helium distribution system has been revised to include bayonet/warm valve type disconnects between each cryomodule and the transfer line distribution system, similar to the Thomas Jefferson National Accelerator Facility (JLab) and the Spallation Neutron Source (SNS) cryogenic distribution systems. The heat loads at various temperature levels and some of the features in the design of the distribution system are outlined. The present status, the plans for fabrication, and the procurement approach for the helium distribution system are also included.

Ganni, V.; Dixon, K.; Laverdure, N.; Knudsen, P.; Arenius, D. [Thomas Jefferson National Accelerator Facility (JLab), Newport News, VA 23606 (United States); Barrios, M.; Jones, S.; Johnson, M.; Casagrande, F. [Facility for Rare Isotope Beams (FRIB), Michigan State University, East Lansing, MI 48824 (United States)

2014-01-29T23:59:59.000Z

89

Multi-objective stochastic Distribution Feeder Reconfiguration from the reliability point of view  

Science Journals Connector (OSTI)

Abstract The main purpose of this paper is to assess the DFR (Distribution Feeder Reconfiguration) strategy as a costless technique to enhance the reliability of the distribution systems. The objective functions to be investigated are: SAIFI (System Average Interruption Frequency Index), AENS (Average Energy Not Supplied), total active power losses and the total network cost. In order to observe the effect of renewable energy sources on the reliability of the power system, wind power source as a popular type of renewable energy source is also considered in the system. In addition, to make the analysis more reliable, the uncertainty of the forecast error of active and reactive loads, wind speed variations as well as the failure rate and repair rate parameters are modeled though the probabilistic load flow. Since the problem investigated is a type of discrete, nonlinear and non-convex optimization problem, a novel self adaptive modified optimization algorithm based on the BA (bat algorithm) is proposed too. The proposed self adaptive modification method makes use of three sub-modifications to give each bat (solution) a choice of preferences during the optimization process. The efficiency and feasibility of the proposed method are studied through a standard IEEE (Institute of Electrical and Electronics Engineers) test system.

Abdollah Kavousi-Fard; Taher Niknam

2014-01-01T23:59:59.000Z

90

Operating Systems: The Problems Of Performance and Reliability  

E-Print Network [OSTI]

Operating Systems: The Problems Of Performance and Reliability B. Randell University of Newcastle and reliability are amongst the most difficult that operating system designers and implementors have to face. This is particularly the case with generic operating systems, i.e., systems intended for use in many different versions

Newcastle upon Tyne, University of

91

Kernel density estimation of reliability with applications to extreme value distribution.  

E-Print Network [OSTI]

??In the present study, we investigate kernel density estimation (KDE) and its application to the Gumbel probability distribution. We introduce the basic concepts of reliability… (more)

Miladinovic, Branko

2008-01-01T23:59:59.000Z

92

RELIABILITY PLANNING IN DISTRIBUTED ELECTRIC ENERGY SYSTEMS  

E-Print Network [OSTI]

for Large Arrays of Wind Turbines (Great Lakes and PacificConsequences for Variance Wind turbines and solar electricestimate of p = .8 and wind turbine arrays. G In section 3

Kahn, E.

2011-01-01T23:59:59.000Z

93

RELIABILITY PLANNING IN DISTRIBUTED ELECTRIC ENERGY SYSTEMS  

E-Print Network [OSTI]

William, "Energy Storage and Solar Power: An Exaggeratedreasons solar cogeneration requires on-site storage (1, 26).that solar alternatives will require so much storage to

Kahn, E.

2011-01-01T23:59:59.000Z

94

NREL Study of Fielded PV Systems Demonstrates PV Reliability...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

modules and systems has decreased sig- nificantly. However, NREL's analysis of Section 1603 of the American Recovery and Reinvestment Tax Act of field performance, reliability,...

95

Combined Heat and Power System Enables 100% Reliability at Leading...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

buildings on nearly 1,000 acres. Photo courtesy of Thermal Energy Corporation Combined Heat and Power System Enables 100% Reliability at Leading Medical Campus Recovery Act...

96

Ductless Hydronic Distribution Systems  

Broader source: Energy.gov [DOE]

This presentation is from a Building America webinar conducted on November 8, 2011, by the Alliance for Residential Building Innovation (ARBI) about ductless hydronic distribution systems.

97

Reliability-based Design of Offshore Mooring Systems  

E-Print Network [OSTI]

This study proposes new methods for the reliability-based design of structural systems, with emphasis on offshore mooring systems. After a brief introduction to the mooring systems, two main objectives are discussed in this dissertation. The first...

Mousavi, Mir Emad

2013-02-05T23:59:59.000Z

98

Distribution expansion planning considering reliability and security of energy using modified PSO (Particle Swarm Optimization) algorithm  

Science Journals Connector (OSTI)

Abstract Distribution feeders and substations need to provide additional capacity to serve the growing electrical demand of customers without compromising the reliability of the electrical networks. Also, more control devices, such as DG (Distributed Generation) units are being integrated into distribution feeders. Distribution networks were not planned to host these intermittent generation units before construction of the systems. Therefore, additional distribution facilities are needed to be planned and prepared for the future growth of the electrical demand as well as the increase of network hosting capacity by DG units. This paper presents a multiobjective optimization algorithm for the MDEP (Multi-Stage Distribution Expansion Planning) in the presence of \\{DGs\\} using nonlinear formulations. The objective functions of the MDEP consist of minimization of costs, END (Energy-Not-Distributed), active power losses and voltage stability index based on SCC (Short Circuit Capacity). A MPSO (modified Particle Swarm Optimization) algorithm is developed and used for this multiobjective MDEP optimization. In the proposed MPSO algorithm, a new mutation method is implemented to improve the global searching ability and restrain the premature convergence to local minima. The effectiveness of the proposed method is tested on a typical 33-bus test system and results are presented.

Jamshid Aghaei; Kashem M. Muttaqi; Ali Azizivahed; Mohsen Gitizadeh

2014-01-01T23:59:59.000Z

99

DOE Electricity Distribution System Workshop  

Broader source: Energy.gov (indexed) [DOE]

DISTRIBUTION SYSTEM WORKSHOP DISTRIBUTION SYSTEM WORKSHOP Mapping Challenges and Opportunities to Help Guide DOE R&D Investments over the Next Five Years Sheraton Crystal City, 1800 Jefferson Davis Hwy, Arlington, Virginia September 24-26, 2012 AGENDA Monday, September 24, 2012 1:00-1:30 Welcome and Introduction to the Grid Tech Team (GTT), Vision, and Framework The GTT synchronizes all grid-related activities across the DOE Dr. Anjan Bose, Grid Tech Team Lead 1:30-1:50 OE Vision, Activities, and Issues Patricia A. Hoffman, Assistant Secretary for the Office of Electricity Delivery and Energy Reliability (OE) 1:50-2:10 EERE Vision, Activities, and Issues Dr. David Danielson, Assistant Secretary for the Office of Energy Efficiency and Renewable Energy (EERE) 2:10-2:40 Open Q&A Rich Scheer,

100

Complex Technical Systems Operation, Reliability, Availability, Safety and Cost Optimization  

Science Journals Connector (OSTI)

The methods based on the results of the joint model linking a semi-Markov modeling of the system operation processes with a multistate approach to system reliability and safety and the linear programming are prop...

Krzysztof Ko?owrocki; Joanna Soszy?ska-Budny

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "distribution system reliability" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Reliability and component importance analysis of substation automation systems  

Science Journals Connector (OSTI)

This paper aims to present a comprehensive technique to quantitatively assess the reliability of substation automation systems. The technique is based on the tie-sets methodology. In order to demonstrate the application of the proposed technique, a variety of substation automation architectures is first introduced. The associated reliability block diagrams as well as the exact system reliability are then given. The impacts and the degree of importance of various components on the reliability of substation automation systems are presented. Two suitable measures of importance are selected. The first is the Birnbaum’s measure used to determine the bottleneck of the system reliability. The second measure uses criticality importance to diagnose failures and generating repair or inspection checklists.

Hamze Hajian-Hoseinabadi

2013-01-01T23:59:59.000Z

102

Transport level multicast protocols providing reliability and scalability properties are certainly essential building blocks for several distributed group applications. We consider the effect of reliable multicast transport  

E-Print Network [OSTI]

1 Abstract Transport level multicast protocols providing reliability and scalability properties are certainly essential building blocks for several distributed group applications. We consider the effect of reliable multicast transport mechanisms on traffic characteristics and hence network performance. Although

Caglar, Mine

103

Impact of Distributed Energy Resources on the Reliability of a Critical Telecommunications Facility  

SciTech Connect (OSTI)

Telecommunications has been identified by the Department of Homeland Security as a critical infrastructure to the United States. Failures in the power systems supporting major telecommunications service nodes are a main contributor to major telecommunications outages, as documented by analyses of Federal Communications Commission (FCC) outage reports by the National Reliability Steering Committee (under auspices of the Alliance for Telecommunications Industry Solutions). There are two major issues that are having increasing impact on the sensitivity of the power distribution to telecommunication facilities: deregulation of the power industry, and changing weather patterns. A logical approach to improve the robustness of telecommunication facilities would be to increase the depth and breadth of technologies available to restore power in the face of power outages. Distributed energy resources such as fuel cells and gas turbines could provide one more onsite electric power source to provide backup power, if batteries and diesel generators fail. But does the diversity in power sources actually increase the reliability of offered power to the office equipment, or does the complexity of installing and managing the extended power system induce more potential faults and higher failure rates? This report analyzes a system involving a telecommunications facility consisting of two switch-bays and a satellite reception system.

Robinson, D.; Atcitty, C.; Zuffranieri, J.; Arent, D.

2006-03-01T23:59:59.000Z

104

Distribution System Research Priorities  

Broader source: Energy.gov (indexed) [DOE]

Mark McGranaghan Mark McGranaghan EPRI ELECTRICITY DISTRIBUTION SYSTEM WORKSHOP Crystal City, VA September 24, 2012 Distribution System Research Priorities 2 © 2012 Electric Power Research Institute, Inc. All rights reserved. The Power System Roadmaps start with a Vision Future Power System will require new technologies, infrastructure, and control systems 3 © 2012 Electric Power Research Institute, Inc. All rights reserved. R&D Roadmaps - Coordination is Critical Roadmaps are living documents 4 © 2012 Electric Power Research Institute, Inc. All rights reserved. Developing the next generation grid * Industry needs new technologies, communication protocols, and information management methods - More variable generation sources and controllable loads - Aging infrastructure

105

Electricity Distribution System Workshop  

Broader source: Energy.gov (indexed) [DOE]

Grid Tech Team Grid Tech Team Discussion Summary Electricity Distribution System Workshop 2 Table of Contents INTRODUCTION ............................................................................................................................................. 3 EXECUTIVE SUMMARY .................................................................................................................................. 4 Process ...................................................................................................................................................... 4 Common Themes ...................................................................................................................................... 5 Discussion Topic Tables ............................................................................................................................. 8

106

System level design of power distribution network for mobile computing platforms.  

E-Print Network [OSTI]

??Providing a reliable power distribution network (PDN) is a critical design challenge for mobile system on chip platforms. A well-designed power distribution network should be… (more)

Shayan Arani, Amirali

2011-01-01T23:59:59.000Z

107

Reliability assessment of autonomous power systems incorporating HVDC interconnection links  

SciTech Connect (OSTI)

The objective of this paper is to present an improved computational method for the overall reliability assessment of autonomous power systems that may or may not contain HVdc interconnection links. This is a hybrid method based on a Monte-Carlo simulation sequential approach which incorporates an analytical approach for the reliability modeling of the HVdc transmission links. The developed models and techniques have been implemented into a computer program that can be used to simulate the operational practices and characteristics of the overall system under study efficiently and realistically. A set of reliability indices are calculated for each load-point of interest and the entire system while a set of additional indices is calculated for quantifying the reliability performance of the interconnection links under the specified operating requirements. The analysis of a practical system is also included for a number of studies representing its various operating and design characteristics.

Dialynas, E.N.; Koskolos, N.C. [National Technical Univ., Athens (Greece). Dept. of Electrical and Computer Engineering] [National Technical Univ., Athens (Greece). Dept. of Electrical and Computer Engineering; Agoris, D. [Public Power Corp., Athens (Greece)] [Public Power Corp., Athens (Greece)

1996-01-01T23:59:59.000Z

108

Computer system reliability and nuclear war  

Science Journals Connector (OSTI)

Given the devastating consequences of nuclear war, it is appropriate to look at current and planned uses of computers in nuclear weapons command and control systems, and to examine whether these systems can fulfill their intended roles.

Alan Borning

1987-02-01T23:59:59.000Z

109

Wind Farm Diversification and Its Impact on Power System Reliability  

E-Print Network [OSTI]

WIND FARM DIVERSIFICATION AND ITS IMPACT ON POWER SYSTEM RELIABILITY A Thesis by YANNICK DEGEILH Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree... of MASTER OF SCIENCE August 2009 Major Subject: Electrical Engineering WIND FARM DIVERSIFICATION AND ITS IMPACT ON POWER SYSTEM RELIABILITY A Thesis by YANNICK DEGEILH Submitted to the Office of Graduate Studies of Texas A...

Degeilh, Yannick

2010-10-12T23:59:59.000Z

110

Final Report for the Virtual Reliability Realization System LDRD  

SciTech Connect (OSTI)

Current approaches to reliability are not adequate to keep pace with the need for faster, better and cheaper products and systems. This is especially true in high consequence of failure applications. The original proposal for the LDRD was to look at this challenge and see if there was a new paradigm that could make reliability predictions, along with a quantitative estimate of the risk in that prediction, in a way that was faster, better and cheaper. Such an approach would be based on the underlying science models that are the backbone of reliability predictions. The new paradigm would be implemented in two software tools: the Virtual Reliability Realization System (VRRS) and the Reliability Expert System (REX). The three-year LDRD was funded at a reduced level for the first year ($120K vs. $250K) and not renewed. Because of the reduced funding, we concentrated on the initial development of the expertise system. We developed an interactive semiconductor calculation tool needed for reliability analyses. We also were able to generate a basic functional system using Microsoft Siteserver Commerce Edition and Microsoft Sequel Server. The base system has the capability to store Office documents from multiple authors, and has the ability to track and charge for usage. The full outline of the knowledge model has been incorporated as well as examples of various types of content.

DELLIN, THEODORE A.; HENDERSON, CHRISTOPHER L.; O'TOOLE, EDWARD J.

2000-12-01T23:59:59.000Z

111

Cyber Effects Analysis Using VCSE Promoting Control System Reliability |  

Broader source: Energy.gov (indexed) [DOE]

Cyber Effects Analysis Using VCSE Promoting Control System Cyber Effects Analysis Using VCSE Promoting Control System Reliability Cyber Effects Analysis Using VCSE Promoting Control System Reliability This report describes the Virtual Control System Environment (VCSE) technology- developed at Sandia National Laboratories-to investigate Supervisory Control And Data Acquisition (SCADA) vulnerabilities associated with energy systems; and it describes a set of experiments with findings from using that environment. The report explains how VCSE can be used to analyze and develop an understanding of cyber attacks. Specific analyses in this report focus on unencrypted, unsecured data channels on Internet protocol (IP)-routed computer networks within electric power systems. Cyber Effects Analysis Using VCSE Promoting Control System Reliability

112

IEEE TRANSACTIONS ON INFORMATION THEORY, VOL. 59, NO. 4, APRIL 2013 2411 Reliability Distributions of Truncated Max-Log-MAP  

E-Print Network [OSTI]

IEEE TRANSACTIONS ON INFORMATION THEORY, VOL. 59, NO. 4, APRIL 2013 2411 Reliability Distributions codes with constraint length two in [10]. Approximations for the MLM reliability distributions have been-form expressions for both 1) the joint distribution of the symbol reliabilities, and 2) the joint probability

Kavcic, Aleksandar

113

Building diagnosable distributed systems  

E-Print Network [OSTI]

Building diagnosable distributed systems Petros Maniatis Intel Research Berkeley ICSI ­ Security] Project response@R (R, K, SI) lookup response Specification #12;2/8/2006 Petros Maniatis9 Strawman Design Join lookup.NI == node.NI Join lookup.NI == succ.NI Select K in (N, S] Project response@R (R, K, SI

Maniatis, Petros

114

2 - Durability and reliability in diesel engine system design  

Science Journals Connector (OSTI)

Abstract: Consideration of durability and reliability is necessary at the earliest stage of system design. This chapter presents the theory and analysis methods of durability and reliability in diesel engine system design. It begins by describing engine durability issues, followed by an elaboration on the relationship between performance and durability through the discussions on system-level loading and durability design constraints. It then provides a systematic introduction on the fundamentals of thermo-mechanical failures and the applications on diesel engine cylinder head, exhaust manifold, valvetrain, piston, turbocharger and aftertreatment devices, followed by discussions on cylinder liner cavitation, engine wear, and EGR cooler durability. An integrated analysis approach on system durability–reliability is finally summarized.

Qianfan Xin

2013-01-01T23:59:59.000Z

115

Reliable Software Development for Machine Protection Systems  

E-Print Network [OSTI]

The Controls software for the Large Hadron Collider (LHC) at CERN, with more than 150 millions lines of code, resides amongst the largest known code bases in the world1. Industry has been applying Agile software engineering techniques for more than two decades now, and the advantages of these techniques can no longer be ignored to manage the code base for large projects within the accelerator community. Furthermore, CERN is a particular environment due to the high personnel turnover and manpower limitations, where applying Agile processes can improve both, the codebase management as well as its quality. This paper presents the successful application of the Agile software development process Scrum for machine protection systems at CERN, the quality standards and infrastructure introduced together with the Agile process as well as the challenges encountered to adapt it to the CERN environment.

Anderson, D; Dragu, M; Fuchsberger, K; Garnier, JC; Gorzawski, AA; Koza, M; Krol, K; Misiowiec, K; Stamos, K; Zerlauth, M

2014-01-01T23:59:59.000Z

116

Reliability of EUCLIDIAN: An autonomous robotic system for image-guided prostate brachytherapy  

SciTech Connect (OSTI)

Purpose: Recently, several robotic systems have been developed to perform accurate and consistent image-guided brachytherapy. Before introducing a new device into clinical operations, it is important to assess the reliability and mean time before failure (MTBF) of the system. In this article, the authors present the preclinical evaluation and analysis of the reliability and MTBF of an autonomous robotic system, which is developed for prostate seed implantation. Methods: The authors have considered three steps that are important in reliability growth analysis. These steps are: Identification and isolation of failures, classification of failures, and trend analysis. For any one-of-a-kind product, the reliability enhancement is accomplished through test-fix-test. The authors have used failure mode and effect analysis for collection and analysis of reliability data by identifying and categorizing the failure modes. Failures were classified according to severity. Failures that occurred during the operation of this robotic system were considered as nonhomogenous Poisson process. The failure occurrence trend was analyzed using Laplace test. For analyzing and predicting reliability growth, commonly used and widely accepted models, Duane's model and the Army Material Systems Analysis Activity, i.e., Crow's model, were applied. The MTBF was used as an important measure for assessing the system's reliability. Results: During preclinical testing, 3196 seeds (in 53 test cases) were deposited autonomously by the robot and 14 critical failures were encountered. The majority of the failures occurred during the first few cases. The distribution of failures followed Duane's postulation as well as Crow's postulation of reliability growth. The Laplace test index was -3.82 (<0), indicating a significant trend in failure data, and the failure intervals lengthened gradually. The continuous increase in the failure occurrence interval suggested a trend toward improved reliability. The MTBF was 592 seeds, which implied that several prostate seed implantation cases would be possible without encountering any critical failure. The shape parameter for the MTBF was 0.3859 (<1), suggesting a positive reliability growth of this robotic system. At 95% confidence, the reliability for deposition of 65 seeds was more than 90%. Conclusions: Analyses of failure mode strongly indicated a gradual improvement of reliability of this autonomous robotic system. High MTBF implied that several prostate seed implant cases would be possible without encountering any critical failure.

Podder, Tarun K.; Buzurovic, Ivan; Huang Ke; Showalter, Timothy; Dicker, Adam P.; Yu, Yan [Department of Radiation Oncology, Kimmel Cancer Center (NCI-designated), Thomas Jefferson University, Philadelphia, Pennsylvania 19107 (United States)

2011-01-15T23:59:59.000Z

117

Reliability analysis for LEB ring magnet power system in SSC  

SciTech Connect (OSTI)

The LEB ring magnet power system contains six subsystems, supervisory control, power supplies, regulation, DC bus, resonant cells, and fault sensing network. The system availability of the total LEB RMPS is required to be 0.999. The work in this paper is to allocate the overall LEB RMPS reliability requirement into reliability requirements for each of the subsystems and lower-tier items. The Feasibility-of-Objective technique combining with engineering experience is the key for the allocation. MIL-HDBK-217F is used to derate SCR components. 7 refs., 5 figs.

Smedley, K.

1991-11-01T23:59:59.000Z

118

Reliability modeling and evaluation of HVDC power transmission systems  

SciTech Connect (OSTI)

The objective of this paper is to present an improved computational method for evaluating the reliability indices of HVdc transmission systems. The developed models and computational techniques are described. These can be used to simulate the operational practices and characteristics of a system under study efficiently and realistically. This method is based on the failure modes and effects analysis and uses the event tree method and the minimal cut set approach to represent the system's operational behavior and deduce the appropriate system's failure modes. A set of five reliability indices is evaluated for each output node being analyzed together with the probability and frequency of encountering particular regions of system performance levels. The analysis of an assumed HVdc bipolar transmission system is also included.

Dialynas, E.N.; Koskolos, N.C. (National Technical Univ., Athens (Greece). Dept. of Electrical and Computer Engineering)

1994-04-01T23:59:59.000Z

119

Tracking the Reliability of the U.S. Electric Power System: An Assessment of Publicly Available Information Reported to State Public Utility Commissions  

E-Print Network [OSTI]

Use Guide for Power Distribution Reliability Indices. ISBN#Engineers (IEEE) Distribution Reliability Working Group,for Electric Power Distribution Reliability Indices, which

LaCommare, Kristina H.

2008-01-01T23:59:59.000Z

120

Reliability Modeling and Evaluation in Aging Power Systems  

E-Print Network [OSTI]

Renewal process has been often employed as a mathematical model of the failure and repair cycle of components in power system reliability assessment. This implies that after repair, the component is assumed to be restored to be in as good as new...

Kim, Hag-Kwen

2010-01-14T23:59:59.000Z

Note: This page contains sample records for the topic "distribution system reliability" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Onsite Wastewater Treatment Systems: Spray Distribution System  

E-Print Network [OSTI]

Spray distribution systems for wastewater are much like lawn sprinkler systems, in that they spray treated wastewater over the surface of a yard. This publication explains how spray distribution systems work, what their design requirements are...

Lesikar, Bruce J.

2008-10-23T23:59:59.000Z

122

An approach for assessing ALWR passive safety system reliability  

SciTech Connect (OSTI)

Many advanced light water reactor designs incorporate passive rather than active safety features for front-line accident response. A method for evaluating the reliability of these passive systems in the context of probabilistic risk assessment has been developed at Sandia National Laboratories. This method addresses both the component (e.g. valve) failure aspect of passive system failure, and uncertainties in system success criteria arising from uncertainties in the system's underlying physical processes. These processes provide the system's driving force; examples are natural circulation and gravity-induced injection. This paper describes the method, and provides some preliminary results of application of the approach to the Westinghouse AP600 design.

Hake, T M

1991-01-01T23:59:59.000Z

123

Reliability analysis for Atucha II reactor protection system signals  

Science Journals Connector (OSTI)

Atucha II is a 745 MW Argentine Power Nuclear Reactor constructed by ENACE SA, Nuclear Argentine Company for Electrical Power Generation and SIEMENS AG KWU, Erlangen, Germany. A preliminary modular logic analysis of RPS (Reactor Protection System) signals was performed by means of the well known Swedish professional risk and reliability software named Risk-Spectrum taking as a basis a reference signal coded as JR17ER003 which command the two moderator loops valves. From the reliability and behavior knowledge for this reference signal folloos an estimation of the reliability for the other 97 RPS signals. Because the preliminary character of this analysis Main Important Measures are not performed at this stage. Reliability is by the statistic value named unavailability predicted. The scope of this analysis is restricted from the measurement elements to the RPS buffer outputs. In the present context only one redundancy is analyzed so in the Instrumentation and Control area there no CCF (Common Cause Failures) present for signals. Finally those unavailability values could be introduced in the failure domain for the posterior complete Atucha II reliability analysis which includes all mechanical and electromechanical features. Also an estimation of the spurious frequency of RPS signals defined as faulty by no trip is performed.

Jose Luis Roca

1996-01-01T23:59:59.000Z

124

Energy and reliability benefits of wind energy conversion systems  

Science Journals Connector (OSTI)

The electrical energy production and reliability benefits of a wind energy conversion system (WECS) at a specific site depend on many factors, including the statistical characteristics of the site wind speed and the design characteristics of the wind turbine generator (WTG) itself, particularly the cut-in, rated and cut-out wind speed parameters. In general, the higher the degree of the wind site matching with a WECS is, the more are the energy and reliability benefits. An electrical energy production and reliability benefit index designated as the Equivalent Capacity Ratio (ECR) is introduced in this paper. This index can be used to indicate the electrical energy production, the annual equivalent utilization time and the credit of a WECS, and quantify the degree of wind site matching with a WECS. The equivalent capacity of a WECS is modeled as the expected value of the power output random variable with the probability density function of the site wind speed. The analytical formulation of the ECR is based on a mathematical derivation with high accuracy. Twelve WTG types and two test systems are used to demonstrate the effectiveness of the proposed model. The results show that the ECR provides a useful index for a WTG to evaluate the energy production and the relative reliability performance in a power system, and can be used to assist in the determination of the optimal WTG type for a specific wind site.

Kaigui Xie; Roy Billinton

2011-01-01T23:59:59.000Z

125

Ductless Hydronic Distribution Systems  

Broader source: Energy.gov (indexed) [DOE]

8, 2011 8, 2011 Ductless Hydronic Distribution Systems Welcome to the Webinar! We will start at 1:00 PM Eastern Time Be sure that you are also dialed into the telephone conference call: Dial-in number: 800-779-8694; Pass code: 2506667 Download the presentation at: www.buildingamerica.gov/meetings.html Building Technologies Program eere.energy.gov * Reduce energy use in new and existing residential buildings * Promote building science and systems engineering / integration approach * "Do no harm": Ensure safety, health and durability are maintained or improved * Accelerate adoption of high performance technologies www.buildingamerica.gov Introduction to Building America Building Technologies Program eere.energy.gov Building America Industry Consortia

126

Distribution lines overload control to increase reliability and power loss reduction  

Science Journals Connector (OSTI)

The Indian Power sector is currently undergoing sea change. The pace of economic development along with increasing power demand would require additional generating capacity. Simultaneously increased efficiency in the sector can help in the task of achieving ... Keywords: ASCR conductor, controlling carbon emission, distribution lines, overload, power losses, reliability

Shrirang Karandikar; Ashok Ghatol

2008-04-01T23:59:59.000Z

127

IEEE TRANSACTIONS ON POWER SYSTEMS, VOL 21,NO 3, AUGUST 2006 Reliability and Cost trade-off in Multi-Area  

E-Print Network [OSTI]

distribution is developed in this paper. After global decomposition, an equation for reliability is derived1 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL 21,NO 3, AUGUST 2006 Reliability and Cost trade an optimization procedure for generation expansion and placement considering generation reliability in multi

128

Method for reliability analysis of complex reactor systems. [LMFBR  

SciTech Connect (OSTI)

A method and a computer code for efficient and accurate reliability analyses of complex reactor systems are described and illustrated through an example. The method permits realistic analyses through its ability to accurately model and evaluate instantaneous and average unavailabilities for large systems with dependencies. The component models can include continuously monitored, non-repairable, and periodically tested components which are subject to failures resulting from components which are subject to failures resulting from component demands, stand-by conditions, human errors associated with testing and repair, as well as failures during actual operation. The numerical process used is efficient and allows analysis of general system configurations with arbitrary scheduling of maintenance operations.

Elerath, J.G.; Vaurio, J.K.; Wood, A.P.

1982-01-01T23:59:59.000Z

129

Reliability guarantees, demonstration, and control for weapon systems proposals  

E-Print Network [OSTI]

in partial fulfillment oi the requirements for the PHOPASSIOMAL LbiGkhr IM MMGIMKKRIMG January 1959 Ma)or Sub)sets Sleotrioal MngineeriIIg RELIABILITY GUARANIS, ISMONSTRATION& A53 CONTROL POR WEAPON SYSTEMS PROPOSALS ROSS ~~' WIN LANI' APProved... acouraoy, and warhead lethality are combined to yield weapon effectiveness, Zffeotivensss is then defined as the probability that any miss1le, after passing all presoribsd oheckouts and given a proper cosm3and, will sucoessfully launch& operate without...

Lanier, Ross Edwin

2012-06-07T23:59:59.000Z

130

Impact of distributed energy resources on the reliability of a critical telecommunications facility.  

SciTech Connect (OSTI)

This report documents a probabilistic risk assessment of an existing power supply system at a large telecommunications office. The focus is on characterizing the increase in the reliability of power supply through the use of two alternative power configurations. Telecommunications has been identified by the Department of Homeland Security as a critical infrastructure to the United States. Failures in the power systems supporting major telecommunications service nodes are a main contributor to major telecommunications outages. A logical approach to improve the robustness of telecommunication facilities would be to increase the depth and breadth of technologies available to restore power in the face of power outages. Distributed energy resources such as fuel cells and gas turbines could provide one more onsite electric power source to provide backup power, if batteries and diesel generators fail. The analysis is based on a hierarchical Bayesian approach and focuses on the failure probability associated with each of three possible facility configurations, along with assessment of the uncertainty or confidence level in the probability of failure. A risk-based characterization of final best configuration is presented.

Robinson, David; Zuffranieri, Jason V.; Atcitty, Christopher B.; Arent, Douglas (National Renewable Energy Laboratory, Golden, CO)

2006-03-01T23:59:59.000Z

131

Improved measurement method for electron energy distribution functions with high accuracy and reliability  

SciTech Connect (OSTI)

An improved ac superimposed method for measuring the electron energy distribution function (EEDF) with high accuracy is proposed. Although high amplitude of the superimposed ac voltage provides a higher signal-to-noise ratio (SNR), it causes the distortion in the EEDF. To correct the distortion, we used two different EEDFs measured by applying two different amplitudes. The distortion was accurately corrected over the entire electron energy region, and the corrected EEDF had the better SNR. The reliability of the corrected EEDF was proved by comparing the effective electron temperatures obtained from the measured EEDFs, and as a result, the corrected EEDF was very reliable.

Bang, Jin Young; Kim, Aram; Chung, Chin Wook [Department of Electrical Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791 (Korea, Republic of)

2010-06-15T23:59:59.000Z

132

Failure and Reliability Analysis for the Master Pump Shutdown System  

SciTech Connect (OSTI)

The Master Pump Shutdown System (MPSS) will be installed in the 200 Areas of the Hanford Site to monitor and control the transfer of liquid waste between tank farms and between the 200 West and 200 East areas through the Cross-Site Transfer Line. The Safety Function provided by the MPSS is to shutdown any waste transfer process within or between tank farms if a waste leak should occur along the selected transfer route. The MPSS, which provides this Safety Class Function, is composed of Programmable Logic Controllers (PLCs), interconnecting wires, relays, Human to Machine Interfaces (HMI), and software. These components are defined as providing a Safety Class Function and will be designated in this report as MPSS/PLC. Input signals to the MPSS/PLC are provided by leak detection systems from each of the tank farm leak detector locations along the waste transfer route. The combination of the MPSS/PLC, leak detection system, and transfer pump controller system will be referred to as MPSS/SYS. The components addressed in this analysis are associated with the MPSS/SYS. The purpose of this failure and reliability analysis is to address the following design issues of the Project Development Specification (PDS) for the MPSS/SYS (HNF 2000a): (1) Single Component Failure Criterion, (2) System Status Upon Loss of Electrical Power, (3) Physical Separation of Safety Class cables, (4) Physical Isolation of Safety Class Wiring from General Service Wiring, and (5) Meeting the MPSS/PLC Option 1b (RPP 1999) Reliability estimate. The failure and reliability analysis examined the system on a component level basis and identified any hardware or software elements that could fail and/or prevent the system from performing its intended safety function.

BEVINS, R.R.

2000-09-05T23:59:59.000Z

133

Hydrogen storage and distribution systems  

Science Journals Connector (OSTI)

Hydrogen storage and transportation or distribution is closely linked together. Hydrogen can be distributed continuously in pipelines or ... or airplanes. All batch transportation requires a storage system but al...

Andreas Züttel

2007-03-01T23:59:59.000Z

134

Software system reliability and safety assessment: an extended FMEA approach  

Science Journals Connector (OSTI)

This paper presents a methodology for assessing the reliability and safety of a software based on an extended Failure Modes and Effects Analysis (FMEA) approach. The methodology is described in steps with illustrative examples. The analysis starts from initial phase of the software development and evolves during the subsequent phases of software development providing valuable information to each phases. Finally, the analysis yields a quantitative assessment of reliability and safety of the software system. The paper's main objective is to support Probabilistic Safety Assessment (PSA) in assessing risk. Risk is a function of severity and failure frequency/probability. The severity is characteristic of failure effects. Failures may be analysed as functional or component failure. In this paper, it is proposed to consider severity levels at functional failure level as it is easier to understand failure effects at functional level. Moreover, various logical combinations of different functional failures can also be formed and analysed using the proposed approach.

Sinda Rebello; Neeraj Kumar Goyal

2010-01-01T23:59:59.000Z

135

Distribution System State Estimation  

Office of Scientific and Technical Information (OSTI)

these include reactive power management, outage management, loss reduction, demand response, adaptable over-current protection, condition-based maintenance, distributed...

136

Assessing the Usefulness of Distributed Measurements in the Smart Grid  

E-Print Network [OSTI]

for achieving greater reliability in distribution systemsImproved Reliability and Failure Diagnosis in Distributionincreasing the reliability of modern power distribution is a

Framhein, Theodore Anthony

2012-01-01T23:59:59.000Z

137

Measuring Advances in HVAC Distribution System Design  

E-Print Network [OSTI]

Advances in HV AC Distribution System Design Ellen FranconiAdvances in HVAC Distribution System Design Ellen Franconisavings result from distribution system design improvements,

Franconi, E.

2011-01-01T23:59:59.000Z

138

Network Reconfiguration at the Distribution System with Distributed Generators  

Science Journals Connector (OSTI)

This article proposes a novel model for distribution network reconfiguration to meet current distribution system operating demands. In the model the connection of distributed generators to distribution system is ...

Gao Xiaozhi; Li Linchuan; Xue Hailong

2010-01-01T23:59:59.000Z

139

Distributed Power Electronics for PV Systems (Presentation)  

SciTech Connect (OSTI)

An overview of the benefits and applications of microinverters and DC power optimizers in residential systems. Some conclusions from this report are: (1) The impact of shade is greater than just the area of shade; (2) Additional mismatch losses include panel orientation, panel distribution, inverter voltage window, soiling; (3) Per-module devices can help increase performance, 4-12% or more depending on the system; (4) Value-added benefits (safety, monitoring, reduced design constraints) are helping their adoption; and (5) The residential market is growing rapidly. Efficiency increases, cost reductions are improving market acceptance. Panel integration will further reduce price and installation cost. Reliability remains an unknown.

Deline, C.

2011-12-01T23:59:59.000Z

140

Gossiping in distributed systems  

E-Print Network [OSTI]

Exchange of information between various nodes in a distributed network can be useful to utilize the available resources effectively. Gossiping algorithms can be used for this purpose. We begin with a survey of various gossiping schemes for different...

Penubothu, Muralidhar V

2012-06-07T23:59:59.000Z

Note: This page contains sample records for the topic "distribution system reliability" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Thermal distribution systems in commercial buildings  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Thermal distribution systems in commercial buildings Thermal distribution systems in commercial buildings Title Thermal distribution systems in commercial buildings Publication Type Journal Article LBNL Report Number LBNL-51860 Year of Publication 2003 Authors Diamond, Richard C., Craig P. Wray, Darryl J. Dickerhoff, Nance Matson, and Duo Wang Start Page Chapter Abstract Previous research suggests that HVAC thermal distribution systems in commercial buildings suffer from thermal losses, such as those caused by duct air leakage and poor duct location. Due to a lack of metrics and data showing the potentially large energy savings from reducing these losses, the California building industry has mostly overlooked energy efficiency improvements in this area. The purpose of this project is to obtain the technical knowledge needed to properly measure and understand the energy efficiency of these systems. This project has three specific objectives: to develop metrics and diagnostics for determining system efficiencies, to develop design and retrofit information that the building industry can use to improve these systems, and to determine the energy impacts associated with duct leakage airflows in an existing large commercial building. The primary outcome of this project is the confirmation that duct leakage airflows can significantly impact energy use in large commercial buildings: our measurements indicate that adding 15% duct leakage at operating conditions leads to an increase in fan power of about 25 to 35%. This finding is consistent with impacts of increased duct leakage airflows on fan power that have been predicted by previous simulations. Other project outcomes include the definition of a new metric for distribution system efficiency, the demonstration of a reliable test for determining duct leakage airflows, and the development of new techniques for duct sealing. We expect that the project outcomes will lead to new requirements for commercial thermal distribution system efficiency in future revisions of California's Title 24.

142

Electricity Distribution System Workshop  

Broader source: Energy.gov (indexed) [DOE]

Discussion Summary Discussion Summary Electricity Transmission System Workshop 1 Grid Tech Team Discussion Summary Electricity Transmission System Workshop 2 Table of Contents INTRODUCTION ............................................................................................................................................. 3 EXECUTIVE SUMMARY .................................................................................................................................. 4 Process ...................................................................................................................................................... 4 Synthesized Challenges ............................................................................................................................. 5

143

A Unified Framework for Reliability Assessment of Wind Energy Conversion Systems  

E-Print Network [OSTI]

1 A Unified Framework for Reliability Assessment of Wind Energy Conversion Systems Sebastian S a framework for assessing wind energy conversion systems (WECS) reliability in the face of external based on wind energy are: the impact of wind speed variability on system reliability [1]; WECS' reaction

Liberzon, Daniel

144

A Framework for Reliability and Performance Assessment of Wind Energy Conversion Systems  

E-Print Network [OSTI]

1 A Framework for Reliability and Performance Assessment of Wind Energy Conversion Systems proposes a framework for reliability and dynamic performance assessment of wind energy conversion systems--Reliability, Dynamic Performance, Wind Power, Wind Energy Conversion System (WECS), Doubly-Fed Induction Generator

Liberzon, Daniel

145

Reliability of islanded microgrids with stochastic generation and prioritized load  

E-Print Network [OSTI]

The potential to improve distribution system reliability is a primary motivation behind the development and deployment of microgrids. Previous studies have illustrated substantial reliability benefits of dispatchable ...

Marden, Mirjana Milosevic

146

Using Fragmentation To Increase Reliability For Workflow Systems  

Science Journals Connector (OSTI)

In a large organization, at any moment there may exist a large number of process instances. If a failure occurs a considerable number of them may be affected. Thus enhancing reliability is an important issue in workflow applications. Traditionally, reliability ...

J. Tang; J. Veijalainen

1999-04-01T23:59:59.000Z

147

On the reliability of peak-flux distributions, with an application to solar flares  

E-Print Network [OSTI]

Narrow-band radio spikes have been recorded during a solar flare with unprecedented resolution. This unique example allows to study the effect of low resolution in previously published peak-flux distributions of radio spikes. We give a general, analytical expression for how an actual peak-flux distribution is changed in shape if the peaks are determined with low temporal and/or frequency resolution. It turns out that, generally, low resolution tends to cause an exponential behavior at large flux values if the actual distribution is of power-law shape. The distribution may be severely altered if the burst-duration depends on the peak-flux. The derived expression is applicable also to peak-flux distributions derived at other wavelengths (e.g. soft and hard X-rays, EUV). We show that for the analyzed spike-event the resolution was sufficient for a reliable peak flux distribution. It can be fitted by generalized power-laws or by an exponential.

H. Isliker; A. O. Benz

2001-06-08T23:59:59.000Z

148

Imprecise Reliability Assessment and Decision-Making when the Type of the Probability Distribution of the Random Variables is  

E-Print Network [OSTI]

1 Imprecise Reliability Assessment and Decision-Making when the Type of the Probability Distribution of the Random Variables is Unknown Efstratios Nikolaidis Department of Mechanical Industrial@oakland.edu First ISSMO Internet Conference on Reliability-based Structural Optimization Keywords: Imprecise

Nikolaidis, Efstratios

149

Main Injector power distribution system  

SciTech Connect (OSTI)

The paper describes a new power distribution system for Fermilab's Main Injector. The system provides 13.8 kV power to Main Injector accelerator (accelerator and conventional loads) and is capable of providing power to the rest of the laboratory (backfeed system). Design criteria, and features including simulation results are given.

Cezary Jach and Daniel Wolff

2002-06-03T23:59:59.000Z

150

Reliability analysis of solar photovoltaic system using hourly mean solar radiation data  

SciTech Connect (OSTI)

This paper presents the hourly mean solar radiation and standard deviation as inputs to simulate the solar radiation over a year. Monte Carlo simulation (MCS) technique is applied and MATLAB program is developed for reliability analysis of small isolated power system using solar photovoltaic (SPV). This paper is distributed in two parts. Firstly various solar radiation prediction methods along with hourly mean solar radiation (HMSR) method are compared. The comparison is carried on the basis of predicted electrical power generation with actual power generated by SPV system. Estimation of solar photovoltaic power using HMSR method is close to the actual power generated by SPV system. The deviation in monsoon months is due to the cloud cover. In later part of the paper various reliability indices are obtained by HMSR method using MCS technique. Load model used is IEEE-RTS. Reliability indices, additional load hours (ALH) and additional power (AP) reduces exponentially with increase in load indicates that a SPV source will offset maximum fuel when all of its generated energy is utilized. Fuel saving calculation is also investigated. Case studies are presented for Sagardeep Island in West Bengal state of India. (author)

Moharil, Ravindra M. [Department of Electrical Engineering, Yeshwantrao Chavan College of Engineering, Nagpur, Maharashtra (India); Kulkarni, Prakash S. [Department of Electrical Engineering, Visvesvaraya National Institute of Technology, South Ambazari Road, Nagpur 440011, Maharashtra (India)

2010-04-15T23:59:59.000Z

151

Chapter 8 - Power-System Reliability Impact of Energy-Storage Integration with Intelligent-Operation Strategy  

Science Journals Connector (OSTI)

Abstract Electric power industry is experiencing a critical movement from the existing conventional electric grid to a more reliable, efficient and secure smart grid. In order to achieve these goals, components such as large scale energy storage will be included. Many feasible applications of energy storage in power systems have been investigated. The major benefits of energy storage include electric energy time-shift, frequency regulation and transmission congestion relief. In this chapter, the focus is on the reliability improvement of the bulk power system brought by the utilization of energy storage in the local distribution systems integrated with renewable energy generation. Operation strategies for flexible energy storage device are critical to the reliability and economic performance of the power system. An intelligent operation strategy for energy storage which improves reliability considering the renewable energy integration is presented. The framework of the smart grid communication and control network is utilized to implement the proposed energy storage operation. A bulk power system reliability evaluation framework is proposed to study the reliability impact brought by the energy storage integration and operation.

Yixing Xu

2015-01-01T23:59:59.000Z

152

Improving grid reliability through integration of distributed PV and energy storage  

Science Journals Connector (OSTI)

Several emerging technologies, namely, high penetration grid-connected distributed photovoltaics (PV), energy storage, and smart grid have seen tremendous growth in recent years. Because of their interconnected nature, the deployed systems are fairly ...

Guohui Yuan

2012-01-01T23:59:59.000Z

153

System Reliability Model for Solid-State Lighting Luminaires  

Broader source: Energy.gov [DOE]

This project is developing and validating a probabilistic reliability prediction tool, and accelerated life testing methodologies, to help lighting manufacturers and stakeholders answer two questions: (1) How can the promised reliability for a rapidly changing technology platform be ensured?, and (2) What will the usage and maintenance profiles be for a product that lasts 15 years?

154

INVESTIGATING THE RELIABILITY OF CORONAL EMISSION MEASURE DISTRIBUTION DIAGNOSTICS USING THREE-DIMENSIONAL RADIATIVE MAGNETOHYDRODYNAMIC SIMULATIONS  

SciTech Connect (OSTI)

Determining the temperature distribution of coronal plasmas can provide stringent constraints on coronal heating. Current observations with the Extreme ultraviolet Imaging Spectrograph (EIS) on board Hinode and the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory provide diagnostics of the emission measure distribution (EMD) of the coronal plasma. Here we test the reliability of temperature diagnostics using three-dimensional radiative MHD simulations. We produce synthetic observables from the models and apply the Monte Carlo Markov chain EMD diagnostic. By comparing the derived EMDs with the 'true' distributions from the model, we assess the limitations of the diagnostics as a function of the plasma parameters and the signal-to-noise ratio of the data. We find that EMDs derived from EIS synthetic data reproduce some general characteristics of the true distributions, but usually show differences from the true EMDs that are much larger than the estimated uncertainties suggest, especially when structures with significantly different density overlap along the line of sight. When using AIA synthetic data the derived EMDs reproduce the true EMDs much less accurately, especially for broad EMDs. The differences between the two instruments are due to the: (1) smaller number of constraints provided by AIA data and (2) broad temperature response function of the AIA channels which provide looser constraints to the temperature distribution. Our results suggest that EMDs derived from current observatories may often show significant discrepancies from the true EMDs, rendering their interpretation fraught with uncertainty. These inherent limitations to the method should be carefully considered when using these distributions to constrain coronal heating.

Testa, Paola [Smithsonian Astrophysical Observatory, 60 Garden Street, MS 58, Cambridge, MA 02138 (United States); De Pontieu, Bart; Martinez-Sykora, Juan [Lockheed Martin Solar and Astrophysics Laboratory, Org. A021S, Building 252, 3251 Hanover Street, Palo Alto, CA 94304 (United States); Hansteen, Viggo; Carlsson, Mats, E-mail: ptesta@cfa.harvard.edu [Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029, Blindern, NO-0315 Oslo (Norway)

2012-10-10T23:59:59.000Z

155

System reliability prediction model based on evidential reasoning algorithm with nonlinear optimization  

Science Journals Connector (OSTI)

In this paper, a novel reliability prediction technique based on the evidential reasoning (ER) algorithm is developed and applied to forecast reliability in turbocharger engine systems. The focus of this study is to examine the feasibility and validity ... Keywords: Evidential reasoning, Forecasting, Nonlinear optimization, Reliability

Chang-Hua Hu; Xiao-Sheng Si; Jian-Bo Yang

2010-03-01T23:59:59.000Z

156

An LMI approach to reliable guaranteed cost control of discrete-time systems with actuator failure  

Science Journals Connector (OSTI)

This paper is concerned with the reliable guaranteed cost control problem for discrete-time systems with actuator failures and a given quadratic cost function. The problem is to design a reliable guaranteed cost state feedback control law which can tolerate ... Keywords: Actuator failure, Guaranteed cost control, LMI, Reliable control

Li Yu

2005-03-01T23:59:59.000Z

157

Water Distribution System Monitoring and Decision Support Using a Wireless Sensor Network  

E-Print Network [OSTI]

Water distribution systems comprise labyrinthine networks of pipes, often in poor states of repair, that are buried beneath our city streets and relatively inaccessible. Engineers who manage these systems need reliable ...

Allen, Michael

158

THE DEVELOPMENT OF DISTRI-bution systems poses new challenges  

E-Print Network [OSTI]

in the way distribution systems are designed, planned, operated, and managed is a must for both developed came into exis- tence. However, recognizing the value of electric energy and the need for development levels of electrification need to be increased and electricity served reliably for sus- tainable economic

Dixon, Juan

159

Distributed Robust Power System State Estimation  

E-Print Network [OSTI]

Deregulation of energy markets, penetration of renewables, advanced metering capabilities, and the urge for situational awareness, all call for system-wide power system state estimation (PSSE). Implementing a centralized estimator though is practically infeasible due to the complexity scale of an interconnection, the communication bottleneck in real-time monitoring, regional disclosure policies, and reliability issues. In this context, distributed PSSE methods are treated here under a unified and systematic framework. A novel algorithm is developed based on the alternating direction method of multipliers. It leverages existing PSSE solvers, respects privacy policies, exhibits low communication load, and its convergence to the centralized estimates is guaranteed even in the absence of local observability. Beyond the conventional least-squares based PSSE, the decentralized framework accommodates a robust state estimator. By exploiting interesting links to the compressive sampling advances, the latter jointly es...

Kekatos, Vassilis

2012-01-01T23:59:59.000Z

160

Water Heaters and Hot Water Distribution Systems  

E-Print Network [OSTI]

from controlling heat loss through the distribution pipes.distribution system configurations; a collection of analytical heat lossdistribution system configurations; a collection of analytical heat loss

Lutz, Jim

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "distribution system reliability" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Enhanced Reliability of Photovoltaic Systems with Energy Storage and Controls  

SciTech Connect (OSTI)

This report summarizes efforts to reconfigure loads during outages to allow individual customers the opportunity to enhance the reliability of their electric service through the management of their loads, photovoltaics, and energy storage devices.

Manz, D.; Schelenz, O.; Chandra, R.; Bose, S.; de Rooij, M.; Bebic, J.

2008-02-01T23:59:59.000Z

162

Joint first-passage probability, and reliability of systems under Stochastic excitation  

E-Print Network [OSTI]

reliability of electrical substation equipment and system. ”nents, e.g. , electrical substations with interconnectedrepresent a small electrical substation. Equip- ment items 1

Song, J; Kiureghian, A D

2006-01-01T23:59:59.000Z

163

Trav Info Evaluation (Technology Element ) Traveler Information Center (TIC) Study: System Reliability and Communications Interface  

E-Print Network [OSTI]

Traveler Information Center (TIC) Study (September 1996 -Information Center (TIC) Study (Technology EvaluationTraveler Information Center (TIC) Study: System Reliability

Miller, Mark; Loukakos, Dimitri

1998-01-01T23:59:59.000Z

164

Preliminary Study on Reliability Analysis of Safety I&C System in NPP  

Science Journals Connector (OSTI)

Digital instrumentation and control (I&C) systems, such as digital Reactor Protection System (RPS), are being employed ... upgraded Nuclear Power Plants (NPPs). The reliability analysis of digital I&C system turn...

Chao Guo; Duo Li; Huasheng Xiong

2012-01-01T23:59:59.000Z

165

Comparison of reliability performance of group connected and conventional HVDC transmission systems  

SciTech Connect (OSTI)

A group connected HVDC transmission scheme is a variant of the unit connection where instead of a single generator, a group of generators are directly connected to the converter. Studies conducted in the past indicated that significant cost reduction can be achieved using this scheme. This is mainly due to the elimination of many components which results in considerable capital and operating cost savings to the utility. Concerns regarding the reliability performance of unit connected schemes were raised, however, there has not been a detailed reliability study conducted. This paper addresses the reliability evaluation aspect of a group connected scheme and compares the reliability performance of the group connected scheme with that of the conventional common collector system. Reliability models for both schemes were developed using a hypothetical system model based on the Nelson River system. Practical system component outage data was used to examine the reliability performance of both schemes.

Kuruganty, S. [Univ. of North Dakota, Grand Forks, ND (United States). Dept. of Electrical Engineering] [Univ. of North Dakota, Grand Forks, ND (United States). Dept. of Electrical Engineering

1995-10-01T23:59:59.000Z

166

Collector Field Maintenance: Distributed Solar Thermal Systems  

Science Journals Connector (OSTI)

This paper reports on recent operation and maintenance experiences with distributed solar thermal systems. Although some information on system-...

E. C. Boes; E. C. Cameron; E. L. Harley

1986-01-01T23:59:59.000Z

167

Optimal planning of distributed generation systems in distribution system: A review  

Science Journals Connector (OSTI)

This paper attempts to present the state of art of research work carried out on the optimal planning of distributed generation (DG) systems under different aspects. There are number of important issues to be considered while carrying out studies related to the planning and operational aspects of DG. The planning of the electric system with the presence of DG requires the definition of several factors, such as: the best technology to be used, the number and the capacity of the units, the best location, the type of network connection, etc. The impact of DG in system operating characteristics, such as electric losses, voltage profile, stability and reliability needs to be appropriately evaluated. For that reason, the use of an optimization method capable of indicating the best solution for a given distribution network can be very useful for the system planning engineer, when dealing with the increase of DG penetration that is happening nowadays. The selection of the best places for installation and the preferable size of the DG units in large distribution systems is a complex combinatorial optimization problem. This paper aims at providing a review of the relevant aspects related to DG and its impact that DG might have on the operation of distributed networks. This paper covers the review of basics of DG, DG definition, current status of DG technologies, potential advantages and disadvantages, review for optimal placement of DG systems, optimizations techniques/methodologies used in optimal planning of DG in distribution systems. An attempt has been made to judge that which methodologies/techniques are suitable for optimal placement of DG systems based on the available literature and detail comparison(s) of each one.

Rajkumar Viral; D.K. Khatod

2012-01-01T23:59:59.000Z

168

Probability distributions of some power system reliability indices  

E-Print Network [OSTI]

. Component Failure Rate X (Failures Per Year) 17 2. Component Average Repair Time r (In Hours) 18 3. Gamma Di s t r i b u t i o n Parameters 18 4. Wei bul l D i s t r i b u t i o n Parameters 18 5. Comparison Of Expected Number Of Failures (Per Year... 0'#5X#'PAR AALL SYAT EM NO. FAILURL =?,I3/) IF (K.EQ.O)GOT0113 NC=NC+1 KJ (NC)=K D01 11J=1,K TE(NC,J)=TSP(J) III CONTINUE C*******TIHE EVENTS ORDERING 113 K=1 IK=1 D013 M= 1 f NC ISN(M) =1 IS (M) = 1 13 CONTINUE 15 TSE(IK)=1.E10 16 D017M...

Dip, Minh

2012-06-07T23:59:59.000Z

169

Wind energy Computerized Maintenance Management System (CMMS) : data collection recommendations for reliability analysis.  

SciTech Connect (OSTI)

This report addresses the general data requirements for reliability analysis of fielded wind turbines and other wind plant equipment. The report provides a list of the data needed to support reliability and availability analysis, and gives specific recommendations for a Computerized Maintenance Management System (CMMS) to support automated analysis. This data collection recommendations report was written by Sandia National Laboratories to address the general data requirements for reliability analysis of fielded wind turbines. This report is intended to help the reader develop a basic understanding of what data are needed from a Computerized Maintenance Management System (CMMS) and other data systems, for reliability analysis. The report provides: (1) a list of the data needed to support reliability and availability analysis; and (2) specific recommendations for a CMMS to support automated analysis. Though written for reliability analysis of wind turbines, much of the information is applicable to a wider variety of equipment and a wider variety of analysis and reporting needs.

Peters, Valerie A.; Ogilvie, Alistair; Veers, Paul S.

2009-09-01T23:59:59.000Z

170

Reliability Based Vegetation Management Through Intelligent System Monitoring  

E-Print Network [OSTI]

management programs for transmission lines operated at 200 kV and above are now subject to a reliability vegetation-caused outages. Programs for lower voltage lines are subject to state regulatory policies data that was utilized and referenced in this report. #12;ii Executive Summary Trees and other

171

A Framework for Multi-Level Reliability Evaluation of Electrical Energy Systems  

E-Print Network [OSTI]

A Framework for Multi-Level Reliability Evaluation of Electrical Energy Systems Alejandro D. Dom@illinois.edu Abstract--This paper proposes a framework for multi-level reliability evaluation of electrical energy intended function or in which degraded performance is not allowed. Electrical energy systems are highly

Liberzon, Daniel

172

Reliability-based synthesis of non-linear stochastic dynamical systems: a global approximation approach  

Science Journals Connector (OSTI)

The paper presents an efficient methodology to carry out reliability-based structural optimisation of non-linear systems under stochastic loading. The optimisation problem is formulated as the minimisation of an objective function subject to multiple reliability constraints. The reliability constraints are given in terms of first excursion probabilities with large state-space dimensions. A sequential approximate optimisation scheme based on global approximations of the reliability constraints is implemented in the proposed formulation. The approximations of the first excursion probabilities in terms of the design variables are constructed by combining a global mixed linearisation approach with a reliability sensitivity analysis. The sensitivity of the first excursion probabilities are estimated by considering some statistics of an augmented reliability problem. The number of reliability estimations required during the optimal design process is generally very small. Two numerical examples are presented to illustrate the effectiveness of the method.

Hector A. Jensen; Macarena S. Ferre; Danilo S. Kusanovic

2010-01-01T23:59:59.000Z

173

Functional reliability analysis of Safety Grade Decay Heat Removal System of Indian 500 MWe PFBR  

Science Journals Connector (OSTI)

Passive systems are increasingly deployed in nuclear industry with an objective of increasing reliability and safety of operations with reduced cost. Methods for assessing the reliability of thermal–hydraulic passive systems, that is systems with moving working fluid, address the issues in natural buoyancy-driven flow that could result in a failure to meet the design safety limits under accident scenarios. This is referred as design functional reliability. This paper presents the results of functional reliability analysis carried out for the passive Safety Grade Decay Heat Removal System (SGDHRS) of Indian Prototype Fast Breeder Reactor (PFBR). The analysis is carried out based on the overall approach reported in the Reliability Methods for Passive System (RMPS, European Commission) project. Functional failure probability is calculated using Monte-Carlo method and also with method of moments.

T. Sajith Mathews; M. Ramakrishnan; U. Parthasarathy; A. John Arul; C. Senthil Kumar

2008-01-01T23:59:59.000Z

174

Distribution System Voltage Regulation by Distributed Energy Resources  

SciTech Connect (OSTI)

This paper proposes a control method to regulate voltages in 3 phase unbalanced electrical distribution systems. A constrained optimization problem to minimize voltage deviations and maximize distributed energy resource (DER) active power output is solved by harmony search algorithm. IEEE 13 Bus Distribution Test System was modified to test three different cases: a) only voltage regulator controlled system b) only DER controlled system and c) both voltage regulator and DER controlled system. The simulation results show that systems with both voltage regulators and DER control provide better voltage profile.

Ceylan, Oguzhan [ORNL; Liu, Guodong [ORNL; Xu, Yan [ORNL; Tomsovic, Kevin [University of Tennessee, Knoxville (UTK)

2014-01-01T23:59:59.000Z

175

Reliable-linac design for accelerator-driven subcritical reactor systems.  

SciTech Connect (OSTI)

Accelerator reliability corresponding to a very low frequency of beam interrupts is an important new accelerator requirement for accelerator-driven subcritical reactor systems. In this paper we review typical accelerator-reliability requirements and discuss possible methods for meeting these goals with superconducting proton-linac technology.

Wangler, Thomas P.,

2002-01-01T23:59:59.000Z

176

Layered and segmented system organization (LASSO) for highly reliable inventory monitoring systems (IMS)  

SciTech Connect (OSTI)

The Trilateral Initiative is preparing for International Atomic Energy Agency (LUiA) verification of excess fissile material released itom the defense programs of the United States and the Russian Federation. Following acceptance of the material using an Attribute Verification System, the IAEA will depend on an Inventory Monitoring System to maintain Continuity of Knowledge of the large inventory of thousands of items. Recovery fiom a total loss of Continuity of Knowledge in such a large storage facility would involve an extremely costly inventory re-verification This paper presents the framework for a Layered and Segmented System Organization that is the basis for a highly reliable IMS with protection-in-depth.

Mangan, Dennis L.; Matter, John C.; Waddoups, I. (Ivan); Abhold, M. E. (Mark E.); Chiaro, P. (Peter)

2002-01-01T23:59:59.000Z

177

Report on the analysis of field data relating to the reliability of solar hot water systems.  

SciTech Connect (OSTI)

Utilities are overseeing the installations of thousand of solar hot water (SHW) systems. Utility planners have begun to ask for quantitative measures of the expected lifetimes of these systems so that they can properly forecast their loads. This report, which augments a 2009 reliability analysis effort by Sandia National Laboratories (SNL), addresses this need. Additional reliability data have been collected, added to the existing database, and analyzed. The results are presented. Additionally, formal reliability theory is described, including the bathtub curve, which is the most common model to characterize the lifetime reliability character of systems, and for predicting failures in the field. Reliability theory is used to assess the SNL reliability database. This assessment shows that the database is heavily weighted with data that describe the reliability of SHW systems early in their lives, during the warranty period. But it contains few measured data to describe the ends of SHW systems lives. End-of-life data are the most critical ones to define sufficiently the reliability of SHW systems in order to answer the questions that the utilities pose. Several ideas are presented for collecting the required data, including photometric analysis of aerial photographs of installed collectors, statistical and neural network analysis of energy bills from solar homes, and the development of simple algorithms to allow conventional SHW controllers to announce system failures and record the details of the event, similar to how aircraft black box recorders perform. Some information is also presented about public expectations for the longevity of a SHW system, information that is useful in developing reliability goals.

Menicucci, David F. (Building Specialists, Inc., Albuquerque, NM)

2011-07-01T23:59:59.000Z

178

Autonomous, Decentralized Grid Architecture: Prosumer-Based Distributed Autonomous Cyber-Physical Architecture for Ultra-Reliable Green Electricity Networks  

SciTech Connect (OSTI)

GENI Project: Georgia Tech is developing a decentralized, autonomous, internet-like control architecture and control software system for the electric power grid. Georgia Tech’s new architecture is based on the emerging concept of electricity prosumers—economically motivated actors that can produce, consume, or store electricity. Under Georgia Tech’s architecture, all of the actors in an energy system are empowered to offer associated energy services based on their capabilities. The actors achieve their sustainability, efficiency, reliability, and economic objectives, while contributing to system-wide reliability and efficiency goals. This is in marked contrast to the current one-way, centralized control paradigm.

None

2012-01-11T23:59:59.000Z

179

Designing Distributed, Real-Time Systems  

E-Print Network [OSTI]

- - Designing Distributed, Real-Time Systems Kevin L. Mills INFT 796 SUMMER 1993 DIRECTED READINGS IN SOFTWARE ENGINEERING WITH DR. H. GOMAA GEORGE MASON UNIVERSITY #12;Designing Distributed, Real-Time Systems problem faced by designers of software systems, and particularly by designers of distributed, real

Mills, Kevin

180

Reliability Modeling and Simulation of Composite Power Systems with Renewable Energy Resources and Storage  

E-Print Network [OSTI]

This research proposes an efficient reliability modeling and simulation methodology in power systems to include photovoltaic units, wind farms and storage. Energy losses by wake effect in a wind farm are incorporated. Using the wake model, wind...

Kim, Hagkwen

2013-05-24T23:59:59.000Z

Note: This page contains sample records for the topic "distribution system reliability" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Reliability Evaluation of Composite Power Systems Including the Effects of Hurricanes  

E-Print Network [OSTI]

Adverse weather such as hurricanes can significantly affect the reliability of composite power systems. Predicting the impact of hurricanes can help utilities for better preparedness and make appropriate restoration arrangements...

Liu, Yong

2011-02-22T23:59:59.000Z

182

Consideration of Reliability in System Design for Ground Water Remediation  

Science Journals Connector (OSTI)

A remedial action design system is described that may be used to evaluate candidate remediation systems and select the preferred alternative under conditions of uncertainty. The remedial action design method i...

W. Woldt; I. Bogardi; L. Duckstein

1991-01-01T23:59:59.000Z

183

Reliability of substation protection system based on IEC61850  

Science Journals Connector (OSTI)

Although the new technology of protection and automation system of substation based on IEC61850 standard has developed rapidly...

Xiaofu Xiong ???; Jun Yu ? ?; Xiaofang Liu ???…

2008-04-01T23:59:59.000Z

184

Comparison of heuristic methods for reliability optimization of series-parallel systems  

E-Print Network [OSTI]

COMPARISON OF HEURISTIC METHODS FOR RELIABILITY OPTIMIZATION OF SERIE&PARALLEL SYSTEMS A Thesis by HSIANG LEE Submitted to the Office of Graduate Studies of Texas ARM University in partial fulfillment of the requirements for the degree... of MASTER OF SCIENCE May 2003 Major Subject: Industrial Engineering COMPARISON OF HEURISTIC METHODS FOR RELIABILITY OPTIMIZATION OF SERIES-PARALLEL SYSTEMS A. Thesis by HSIANG LEE Submitted to Texas ASSAM University in partial fulfillment...

Lee, Hsiang

2012-06-07T23:59:59.000Z

185

Reliability Analysis of Electric Power Systems Using an Object-oriented Hybrid Modeling Approach  

E-Print Network [OSTI]

The ongoing evolution of the electric power systems brings about the need to cope with increasingly complex interactions of technical components and relevant actors. In order to integrate a more comprehensive spectrum of different aspects into a probabilistic reliability assessment and to include time-dependent effects, this paper proposes an object-oriented hybrid approach combining agent-based modeling techniques with classical methods such as Monte Carlo simulation. Objects represent both technical components such as generators and transmission lines and non-technical components such as grid operators. The approach allows the calculation of conventional reliability indices and the estimation of blackout frequencies. Furthermore, the influence of the time needed to remove line overloads on the overall system reliability can be assessed. The applicability of the approach is demonstrated by performing simulations on the IEEE Reliability Test System 1996 and on a model of the Swiss high-voltage grid.

Schläpfer, Markus; Kröger, Wolfgang

2012-01-01T23:59:59.000Z

186

Heat Distribution Systems | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Distribution Systems Distribution Systems Heat Distribution Systems May 16, 2013 - 5:26pm Addthis Radiators are used in steam and hot water heating. | Photo courtesy of ©iStockphoto/Jot Radiators are used in steam and hot water heating. | Photo courtesy of ©iStockphoto/Jot Heat is distributed through your home in a variety of ways. Forced-air systems use ducts that can also be used for central air conditioning and heat pump systems. Radiant heating systems also have unique heat distribution systems. That leaves two heat distribution systems -- steam radiators and hot water radiators. Steam Radiators Steam heating is one of the oldest heating technologies, but the process of boiling and condensing water is inherently less efficient than more modern systems, plus it typically suffers from significant lag times between the

187

Reliability assessment of electrical power systems using genetic algorithms  

E-Print Network [OSTI]

of the dissertation, a GA based method for state sampling of composite generation-transmission power systems is introduced. Binary encoded GA is used as a state sampling tool for the composite power system network states. A linearized optimization load flow model...

Samaan, Nader Amin Aziz

2004-11-15T23:59:59.000Z

188

On the problem of reliable stabilization for large power systems  

E-Print Network [OSTI]

, the electric power systems such as the Eastern/Western North American grids and European grid have experienced, and moreover pushed the networks to their operational limits. Besides, the integration of land-based/offshore dynamics as well as on the load flow of the system. On the other hand, the transmission grids have seen

Antsaklis, Panos

189

Electricity Distribution Systems: How Information Will Lead the Transformation  

Broader source: Energy.gov (indexed) [DOE]

IBM IBM Electricity Distribution Systems How information will lead the transformation Allan Schurr VP Energy and Utilities 24 September 2012 Corporation Challenges facing the energy grid New entrants and disruptive technologies environmental concerns Increased pressure on Climate change and Aging asset performance operational efficiency with increased expectations and workforce on reliability productivity Increasing desire by consumers for a role in energy management and Growth in renewable generation and distributed resources conservation © 2012 IBM Corporation 2 Other transformed industries have lessons for the power grid Common Themes * Technology innovation * Disruptive new entrants * New business models Benefits for the consumer © 2012 IBM Corporation

190

Definition: Distribution Management System | Open Energy Information  

Open Energy Info (EERE)

Management System Management System Jump to: navigation, search Dictionary.png Distribution Management System A Distribution Management System (DMS) is a utility IT system capable of collecting, organizing, displaying and analyzing real-time or near real-time electric distribution system information. A DMS can also allow operators to plan and execute complex distribution system operations in order to increase system efficiency, optimize power flows, and prevent overloads. A DMS can interface with other operations applications such as geographic information systems (GIS), outage management systems (OMS), and customer information systems (CIS) to create an integrated view of distribution operations.[1] View on Wikipedia Wikipedia Definition In the recent years, utilization of electrical energy increased

191

A Simulation Model for Evaluating Distributed Systems Dependability  

E-Print Network [OSTI]

In this paper we present a new simulation model designed to evaluate the dependability in distributed systems. This model extends the MONARC simulation model with new capabilities for capturing reliability, safety, availability, security, and maintainability requirements. The model has been implemented as an extension of the multithreaded, process oriented simulator MONARC, which allows the realistic simulation of a wide-range of distributed system technologies, with respect to their specific components and characteristics. The extended simulation model includes the necessary components to inject various failure events, and provides the mechanisms to evaluate different strategies for replication, redundancy procedures, and security enforcement mechanisms, as well. The results obtained in simulation experiments presented in this paper probe that the use of discrete-event simulators, such as MONARC, in the design and development of distributed systems is appealing due to their efficiency and scalability.

Dobre, Ciprian; Cristea, Valentin

2012-01-01T23:59:59.000Z

192

Reliability enhancement in software testing – an agent-based approach for complex systems  

Science Journals Connector (OSTI)

Although each paradigm have their own influence in the software engineering field with the support of their merits, researchers continue to strive for more efficient and powerful techniques. Agents are being advocated as a next generation model for engineering ... Keywords: agent-based framework, distributed frame work, integrated framework, intra-class testing, multi agent-based, reliability enhancement

P. Dhavachelvan; G. V. Uma

2004-12-01T23:59:59.000Z

193

The Clouds Distributed Operating System * Partha Dasgupta  

E-Print Network [OSTI]

The Clouds Distributed Operating System * Partha Dasgupta Dept. of Computer Science and Engg Ramachandran. College of Computing Georgia Tech, Atlanta, GA 30332 Keywords: Distributed Operating Systems operating system that runs on general purpose computers connected via a local­area network. The system

Yeom, Heon Young

194

Assessing Reliability of Substation Spare Current Transformer System  

Science Journals Connector (OSTI)

This paper relates a case study involving Current Transformers (CTs) from the electrical system of the Companhia Hidro Elétrica do Săo Francisco (CHESF) in order to estimate the optimum number of spare. Two mo...

Cristiano G. de Melo; Renata Maria Cardoso R. de Souza…

2012-01-01T23:59:59.000Z

195

Reliability review of the remote tool delivery system locomotor  

SciTech Connect (OSTI)

The locomotor being built by RedZone Robotics is designed to serve as a remote tool delivery (RID) system for waste retrieval, tank cleaning, viewing, and inspection inside the high-level waste tanks 8D-1 and 8D-2 at West Valley Nuclear Services (WVNS). The RTD systm is to be deployed through a tank riser. The locomotor portion of the RTD system is designed to be inserted into the tank and is to be capable of moving around the tank by supporting itself and moving on the tank internal structural columns. The locomotor will serve as a mounting platform for a dexterous manipulator arm. The complete RTD system consists of the locomotor, dexterous manipulator arm, cameras, lights, cables, hoses, cable/hose management system, power supply, and operator control station.

Chesser, J.B.

1999-04-01T23:59:59.000Z

196

Information sharing for distributed intrusion detection systems  

Science Journals Connector (OSTI)

In this paper, we present an information sharing model for distributed intrusion detection systems. The typical challenges faced by distributed intrusion detection systems is what information to share and how to share information. We address these problems ... Keywords: Anomaly detection, Denial of service attack, Distributed intrusion detection, Information sharing, Reflector attack

Tao Peng; Christopher Leckie; Kotagiri Ramamohanarao

2007-08-01T23:59:59.000Z

197

Describing and Analyzing Distributed Software System Designs  

E-Print Network [OSTI]

Describing and Analyzing Distributed Software System Designs GEORGE S. AVRUNIN and JACK C. WILEDEN by applying it to a realistic distributed software-system design problem involving mutual exclusion Additional Key Words and Phrases: Analysis of software design, design notation, distributed mutual exclusion

Avrunin, George S.

198

Interoperability between a dynamic reliability modeling and a Systems Engineering process Principles and Case Study  

E-Print Network [OSTI]

element for interoperability with the tools and activities required for a dynamic reliability assessment. The case study is the dynamic assessment of availability of a feed-water control system in a power plant steam generator, presented in previous articles. Keywords: Systems engineering, systems modeling, RAMS

Paris-Sud XI, Université de

199

Low jitter RF distribution system  

DOE Patents [OSTI]

A timing signal distribution system includes an optical frequency stabilized laser signal amplitude modulated at an rf frequency. A transmitter box transmits a first portion of the laser signal and receive a modified optical signal, and outputs a second portion of the laser signal and a portion of the modified optical signal. A first optical fiber carries the first laser signal portion and the modified optical signal, and a second optical fiber carries the second portion of the laser signal and the returned modified optical signal. A receiver box receives the first laser signal portion, shifts the frequency of the first laser signal portion outputs the modified optical signal, and outputs an electrical signal on the basis of the laser signal. A detector at the end of the second optical fiber outputs a signal based on the modified optical signal. An optical delay sensing circuit outputs a data signal based on the detected modified optical signal. An rf phase detect and correct signal circuit outputs a signal corresponding to a phase stabilized rf signal based on the data signal and the frequency received from the receiver box.

Wilcox, Russell; Doolittle, Lawrence; Huang, Gang

2012-09-18T23:59:59.000Z

200

WATER DISTRIBUTION SYSTEM OPERATION: APPLICATION OF  

E-Print Network [OSTI]

CHAPTER 5 WATER DISTRIBUTION SYSTEM OPERATION: APPLICATION OF SIMULATED ANNEALING Fred E. Goldman Arizona State University, Tempe, Arizona 5.1 INTRODUCTION The operation of water distribution systems affects the water quality in these systems. EPA regulations require that water quality be maintained

Mays, Larry W.

Note: This page contains sample records for the topic "distribution system reliability" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Laser Spark Distribution and Ignition System  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

partners interested in implement- ing United States Patent Number 7,421,166 entitled "Laser Spark Distribution and Ignition System." Disclosed in this patent is NETL's laser...

202

A Distributed Honeypot System for Grid Security  

Science Journals Connector (OSTI)

In this paper, we propose a distributed honeypot model for grid computing system security. Based on the IDS Snort and the...

Geng Yang; Chunming Rong; Yunping Dai

2004-01-01T23:59:59.000Z

203

Building a Smarter Distribution System in Pennsylvania  

Broader source: Energy.gov (indexed) [DOE]

Development of an advanced distribution management system (DMS) software is at the heart of the project. The DMS monitors and controls all of the smart devices being installed...

204

Building America Webinar: Ductless Hydronic Distribution Systems...  

Energy Savers [EERE]

Ductless Hydronic Distribution Systems This webinar was presented by research team Alliance for Residential Building Innovation (ARBI), and reviewed findings from a feasibility...

205

How to Effectively Compute the Reliability of a Thermal-Hydraulic Nuclear Passive System  

E-Print Network [OSTI]

of a thermal-hydraulic (T-H) passive system of a nuclear power plant can be obtained by i) Monte Carlo (MC1 How to Effectively Compute the Reliability of a Thermal- Hydraulic Nuclear Passive System E. Zio1 be prohibitive because of the large number of (typically long) T-H code simulations that must be performed (one

Boyer, Edmond

206

Power Systems Engineering  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and distribution systems; steam, water, fuel, and environmental monitoring systems; alternative energy systems; reliability, availability, and maintainability assessments;...

207

Assembly and comparison of available solar hot water system reliability databases and information.  

SciTech Connect (OSTI)

Solar hot water (SHW) systems have been installed commercially for over 30 years, yet few quantitative details are known about their reliability. This report describes a comprehensive analysis of all of the known major previous research and data regarding the reliability of SHW systems and components. Some important conclusions emerged. First, based on a detailed inspection of ten-year-old systems in Florida, about half of active systems can be expected to fail within a ten-year period. Second, valves were identified as the probable cause of a majority of active SHW failures. Third, passive integral and thermosiphon SHW systems have much lower failure rates than active ones, probably due to their simple design that employs few mechanical parts. Fourth, it is probable that the existing data about reliability do not reveal the full extent of fielded system failures because most of the data were based on trouble calls. Often an SHW system owner is not aware of a failure because the backup system silently continues to produce hot water. Thus, a repair event may not be generated in a timely manner, if at all. This final report for the project provides all of the pertinent details about this study, including the source of the data, the techniques to assure their quality before analysis, the organization of the data into perhaps the most comprehensive reliability database in existence, a detailed statistical analysis, and a list of recommendations for additional critical work. Important recommendations include the inclusion of an alarm on SHW systems to identify a failed system, the need for a scientifically designed study to collect high-quality reliability data that will lead to design improvements and lower costs, and accelerated testing of components that are identified as highly problematic.

Menicucci, David F. (Building Specialists, Inc., Albuquerque, NM)

2009-05-01T23:59:59.000Z

208

Evaluation of systems specified to work at a high level of reliability  

E-Print Network [OSTI]

Evaluation of Systems Specified. to Mork at a High Level of Reliability. (August 1974) I Luc Perrouin, Ingenieur civil des Telecommunications Chairman of Advisory Committee: Dr. H. 0. Hartley In order to evaluate the reliability of a system to a high... to express my sincerest appreciation and gratitude to Dr. H. 0. Hartley for his patience and understanding during the course of this research and for his invaluable help during my year of study at Texas AQ4 University. I am s1so thankfu1 to the members...

Perrouin, Luc Victor

2012-06-07T23:59:59.000Z

209

Hybrid solar lighting distribution systems and components  

DOE Patents [OSTI]

A hybrid solar lighting distribution system and components having at least one hybrid solar concentrator, at least one fiber receiver, at least one hybrid luminaire, and a light distribution system operably connected to each hybrid solar concentrator and each hybrid luminaire. A controller operates all components.

Muhs, Jeffrey D. (Lenoir City, TN); Earl, Dennis D. (Knoxville, TN); Beshears, David L. (Knoxville, TN); Maxey, Lonnie C. (Powell, TN); Jordan, John K. (Oak Ridge, TN); Lind, Randall F. (Lenoir City, TN)

2011-07-05T23:59:59.000Z

210

Design of an advanced electric power distribution systems using seeker optimization algorithm  

Science Journals Connector (OSTI)

Abstract The power distribution network design problem has a growing impact on secure and economical operation of distribution power system. This issue is well known as a non-linear, multi-modal and multi-objective optimization problem where global optimization techniques are required in order to avoid local minima. In this study, a new approach using seeker optimization algorithm (SOA) is proposed for distribution system planning problem with simultaneous placement of automatic reclosers (RAs), considering total system economic cost, overall system reliability, system power losses and voltage deviations as an objective functions. Normally, conventional power distribution systems (CPDS) are radial in nature and momentary fault in the system causes large area of the grid to be blacked out, which leads to huge load interruptions. Reliable distribution system minimize this effect by allowing faults to clear themselves by protection device operations such as automatic reclosers (RAs) and quickly restores the power through system reconfiguration by minimizing the loads affected. Thus, in order to prevent the system from momentary faults, simultaneous placement of \\{RAs\\} has been also done which leads to a design of an advanced power distribution system (APDS). Thus, the reliability issues are of major importance for effective planning of an APDS. For evaluation of reliability measure, the contingency-load-loss index (CLLI) is assessed in this paper, which is independent of the failure rate and fault repair duration of the feeder branches. The performance of the proposed algorithm is extensively assessed and comparisons are made with Particle Swarm Optimization (PSOs), Genetic Algorithm (GA) and graph theoretical approach (GTA) applied on the 54 and 100-bus primary power distribution systems. The simulation results show that the proposed approach performed better than the other listed algorithms and can be efficiently used for the optimal design of an advanced power distribution system.

Deepak Kumar; S.R. Samantaray

2014-01-01T23:59:59.000Z

211

North American Electric Reliability Corporation (NERC): Reliability  

Broader source: Energy.gov (indexed) [DOE]

Corporation (NERC): Reliability Corporation (NERC): Reliability Considerations from the Integration of Smart Grid North American Electric Reliability Corporation (NERC): Reliability Considerations from the Integration of Smart Grid North American Electric Reliability Corporation (NERC): Reliability Considerations from the Integration of Smart Grid. NERC develops and enforces Reliability Standards; assesses adequacy annually via a ten-year forcast and winter and summer forecasts; monitors the bulk power systems; and educates, trains, and certifies industry personnel. North American Electric Reliability Corporation (NERC): Reliability Considerations from the Integration of Smart Grid More Documents & Publications Re: DOE Request for Information - Implementing the National Broadband Plan by Studying the Communications Requirements of Electric Utilities to

212

Reliability analysis of safety grade decay heat removal system of Indian prototype fast breeder reactor  

Science Journals Connector (OSTI)

The 500 MW Indian pool type Prototype Fast Breeder Reactor (PFBR), is provided with two independent and diverse Decay Heat Removal (DHR) systems viz., Operating Grade Decay Heat Removal System (OGDHRS) and Safety Grade Decay Heat Removal System (SGDHRS). OGDHRS utilizes the secondary sodium loops and Steam–Water System with special decay heat removal condensers for DHR function. The unreliability of this system is of the order of 0.1–0.01. The safety requirements of the present generation of fast reactors are very high, and specifically for DHR function the failure frequency should be less than ?1E-7/ry. Therefore, a passive SGDHR system using four completely independent thermo-siphon loops in natural convection mode is provided to ensure adequate core cooling for all Design Basis Events. The very high reliability requirement for DHR function is achieved mainly with the help of SGDHRS. This paper presents the reliability analysis of SGDHR system. Analysis is performed by Fault Tree method using ‘CRAFT’ software developed at Indira Gandhi Centre for Atomic Research. This software has special features for compact representation and CCF analysis of high redundancy safety systems encountered in nuclear reactors. Common Cause Failures (CCF) are evaluated by ? factor method. The reliability target for SGDHRS arrived from DHR reliability requirement and the ultimate number of demands per year (7/y) on SGDHRS is that the failure frequency should be ?1.4E-8/de. Since it is found from the analysis that the unreliability of SGDHRS with identical loops is 5.2E-6/de and dominated by leak rates of components like AHX, DHX and sodium dump and isolation valves, options with diversity measures in important components were studied. The failure probability of SGDHRS for a design consisting of 2 types of diverse loops (Diverse AHX, DHX and sodium dump and isolation valves) is 2.1E-8/de, which practically meets the reliability requirement.

A. John Arul; C. Senthil Kumar; S. Athmalingam; Om Pal Singh; K. Suryaprakasa Rao

2006-01-01T23:59:59.000Z

213

Reliability evaluation for large-scale bulk transmission systems: Volume 1, Comparative evaluation, method development, and recommendations: Final report  

SciTech Connect (OSTI)

This volume (1 of 2) contains a comparative evaluation of existing transmission system reliability programs (SYREL, GATOR, RECS) and relevant mathematical methods for transmission reliability analysis. Several new and enhanced methods in the areas of network analysis, contingency selection, remedial action, and reliability index calculation, developed and tested during the project, are described. Recommendations for methods to be used in a production grade transmission reliability assessment program are presented. 69 figs., 41 tabs.

Lam, B.P.; Lawrence, D.J.; Reppen, N.D.; Ringlee, R.J.

1988-01-01T23:59:59.000Z

214

Laser Spark Distribution and Ignition System  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Spark Distribution and Ignition System Spark Distribution and Ignition System Opportunity The Department of Energy's National Energy Technology Laboratory (NETL) is seeking licensing partners interested in implement- ing United States Patent Number 7,421,166 entitled "Laser Spark Distribution and Ignition System." Disclosed in this patent is NETL's laser spark distribution and ignition system, which reduces the high-power optical requirements normally needed for such a system by using optical fibers to deliver low-peak-energy pumping pulses to a laser amplifier or laser oscillator. Laser spark generators then produce a high-peak-power laser spark from a single low power pulse. The system has ap- plications in natural gas fueled reciprocating engines, turbine combustors, explosives, and laser induced breakdown spectroscopy diagnostic sensors.

215

Techniques for Modeling the Reliability of Fault-Tolerant Systems With  

Science Journals Connector (OSTI)

This paper presents a step-by-step tutorial of the methods and the tools that were used for the reliability analysis of fault-tolerant systems. The approach used in this paper is the Markov (or semi-Markov) state-space method. The paper is intended for ...

Butler Ricky W.; Johnson Sally C.

1995-09-01T23:59:59.000Z

216

MINI-SYMPOSIUM COMPDYN2011 RELIABILITY OF STRUCTURAL AND MECHANICAL SYSTEMS  

E-Print Network [OSTI]

MINI-SYMPOSIUM ­ COMPDYN2011 RELIABILITY OF STRUCTURAL AND MECHANICAL SYSTEMS FOR UNCERTAIN, structural mechanics, and wind engineering are appropriate for this mini-symposium. #12; University, 110V, Valparaiso, Chile 2 Institute of Engineering Mechanics, University of Innsbruck, A-6020

Kreinovich, Vladik

217

Electricity Reliability  

E-Print Network [OSTI]

Electricity Delivery and Energy Reliability High Temperature Superconductivity (HTS) Visualization in the future because they have virtually no resistance to electric current, offering the possibility of new electric power equipment with more energy efficiency and higher capacity than today's systems

218

Reliability of Beam Loss Monitors System for the Large Hadron Collider  

E-Print Network [OSTI]

The employment of superconducting magnets, in the high energies colliders, opens challenging failure scenarios and brings new criticalities for the whole system protection. For the LHC beam loss protection system, the failure rate and the availability requirements have been evaluated using the Safety Integrity Level (SIL) approach. A downtime cost evaluation is used as input for the SIL approach. The most critical systems, which contribute to the final SIL value, are the dump system, the interlock system, the beam loss monitors system and the energy monitor system. The Beam Loss Monitors System (BLMS) is critical for short and intense particles losses, while at medium and higher loss time it is assisted by other systems, such as the quench protection system and the cryogenic system. For BLMS, hardware and software have been evaluated in detail. The reliability input figures have been collected using historical data from the SPS, using temperature and radiation damage experimental data as well as using standar...

Guaglio, Gianluca; Santoni, C

2004-01-01T23:59:59.000Z

219

Development of an Integrated Distribution Management System  

SciTech Connect (OSTI)

This final report details the components, functionality, costs, schedule and benefits of developing an Integrated Distribution Management System (IDMS) for power distribution system operation. The Distribution Automation (DA) and Supervisory Control and Data Acquisition (SCADA) systems used by electric power companies to manage the distribution of electric power to retail energy consumers are vital components of the Nation’s critical infrastructure. Providing electricity is an essential public service and a disruption in that service, if not quickly restored, could threaten the public safety and the Nation’s economic security. Our Nation’s economic prosperity and quality of life have long depended on the essential services that utilities provide; therefore, it is necessary to ensure that electric utilities are able to conduct their operations safely and efficiently. A fully integrated technology of applications is needed to link various remote sensing, communications and control devices with other information tools that help guide Power Distribution Operations personnel. A fully implemented IDMS will provide this, a seamlessly integrated set of applications to raise electric system operating intelligence. IDMS will enhance DA and SCADA through integration of applications such as Geographic Information Systems, Outage Management Systems, Switching Management and Analysis, Operator Training Simulator, and other Advanced Applications, including unbalanced load flow and fault isolation/service restoration. These apps are capable of utilizing and obtaining information from appropriately installed DER, and by integrating disparate systems, the Distribution Operators will benefit from advanced capabilities when analyzing, controlling and operating the electric system.

Schatz, Joe E.

2010-10-20T23:59:59.000Z

220

NREL: Electric Infrastructure Systems Research - Distributed Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Distributed Energy Resources Test Facility Distributed Energy Resources Test Facility NREL's Distributed Energy Resources Test Facility (DERTF) is a working laboratory for interconnection and systems integration testing. This state-of-the-art facility includes generation, storage, and interconnection technologies as well as electric power system equipment capable of simulating a real-world electric system. Photo of the Distributed Energy Resources Test Facility and an adjacent solar photovoltaic array. The Distributed Energy Resources Test Facility is located at the National Wind Technology Center near Boulder, Colorado. Take a virtual tour of the DERTF. Researchers at the facility can vary equipment configurations and introduce common electrical disturbances such as sags, swells, and harmonic issues on

Note: This page contains sample records for the topic "distribution system reliability" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Study Shows Active Power Controls from Wind May Increase Revenues and Improve System Reliability  

Broader source: Energy.gov [DOE]

The DOE Wind Program and the National Renewable Energy Laboratory recently published a study conducted in collaboration with the Electric Power Research Institute and the University of Colorado. Researchers examined how the contribution of wind power providing active power controls could benefit the total power system economics, increase revenue streams, and improve the reliability and security of the nation’s power system, all while having negligible impacts on the turbine and its components.

222

Reliability and Geographic Trends of 50,000 Photovoltaic Systems in the USA: Preprint  

SciTech Connect (OSTI)

This paper presents performance and reliability data from nearly 50,000 photovoltaic (PV) systems totaling 1.7 gigawatts installed capacity in the USA from 2009 to 2012 and their geographic trends. About 90% of the normal systems and about 85% of all systems, including systems with known issues, performed to within 10% or better of expected performance. Although considerable uncertainty may exist due to the nature of the data, hotter climates appear to exhibit some degradation not seen in the more moderate climates. Special causes of underperformance and their impacts are delineated by reliability category. Hardware-related issues are dominated by inverter problems (totaling less than 0.5%) and underperforming modules (totaling less than 0.1%). Furthermore, many reliability categories show a significant decrease in occurrence from year 1 to subsequent years, emphasizing the need for higher-quality installations but also the need for improved standards development. The probability of PV system damage because of hail is below 0.05%. Singular weather events can have a significant impact such as a single lightning strike to a transformer or the impact of a hurricane. However, grid outages are more likely to have a significant impact than PV system damage when extreme weather events occur.

Jordan, D. C.; Kurtz, S. R.

2014-09-01T23:59:59.000Z

223

Reliability of Beam Loss Monitors System for the Large Hadron Collider  

Science Journals Connector (OSTI)

The employment of superconducting magnets in high energy colliders opens challenging failure scenarios and brings new criticalities for the whole system protection. For the LHC beam loss protection system the failure rate and the availability requirements have been evaluated using the Safety Integrity Level (SIL) approach. A downtime cost evaluation is used as input for the SIL approach. The most critical systems which contribute to the final SIL value are the dump system the interlock system the beam loss monitors system and the energy monitor system. The Beam Loss Monitors System (BLMS) is critical for short and intense particle losses while at medium and higher loss time it is assisted by other systems such as the quench protection system and the cryogenic system. For BLMS hardware and software have been evaluated in detail. The reliability input figures have been collected using historical data from the SPS using temperature and radiation damage experimental data as well as using standard databases. All the data have been processed by reliability software (Isograph). The analysis ranges from the components data to the system configuration.

G. Guaglio; B. Dehning; C. Santoni

2004-01-01T23:59:59.000Z

224

Reliability of Beam Loss Monitor Systems for the Large Hadron Collider  

Science Journals Connector (OSTI)

The increase of beam energy and beam intensity together with the use of super conducting magnets opens new failure scenarios and brings new criticalities for the whole accelerator protection system. For the LHC beam loss protection system the failure rate and the availability requirements have been evaluated using the Safety Integrity Level (SIL) approach. A downtime cost evaluation is used as input for the SIL approach. The most critical systems which contribute to the final SIL value are the dump system the interlock system the beam loss monitors system and the energy monitor system. The Beam Loss Monitors System (BLMS) is critical for short and intense particles losses at 7 TeV and assisted by the Fast Beam Current Decay Monitors at 450 GeV. At medium and higher loss time it is assisted by other systems such as the quench protection system and the cryogenic system. For BLMS hardware and software have been evaluated in detail. The reliability input figures have been collected using historical data from the SPS using temperature and radiation damage experimental data as well as using standard databases. All the data has been processed by reliability software (Isograph). The analysis spaces from the components data to the system configuration.

G. Guaglio; B. Dehning; C. Santoni

2005-01-01T23:59:59.000Z

225

Performance Simulation of a Dependable Distributed System Yinong Chen  

E-Print Network [OSTI]

]. Availability, reliability and risk analysis were studied under Markov models in [7]. This work describes, including · Reliability: The property of continuity regarding service delivery. Reliability is denoted by R in safety-critical control and monitoring systems like nuclear reactors, flight control and traffic

Chen, Yinong

226

Examination and characterization of distribution system biofilms.  

Science Journals Connector (OSTI)

...18 May 1987/Accepted 21 August 1987 Investigations concerning the role of distribution...not occurring at the treatment plant. Remedial actions to control the coliform episode...forms in a water distribution system: a remedial approach. J. Am. Water Works Assoc...

M W LeChevallier; T M Babcock; R G Lee

1987-12-01T23:59:59.000Z

227

A DISTRIBUTED AUTOMATION SYSTEM FOR ELECTROPHYSICAL INSTALLATIONS  

E-Print Network [OSTI]

A DISTRIBUTED AUTOMATION SYSTEM FOR ELECTROPHYSICAL INSTALLATIONS V.R. Kozak Budker Institute There was designed a set of devices for automation systems of physical installations. On this basis approach. KEY WORDS Automation, systems, applications, CANBUS, embedded, controller. 1. Introduction Budker

Kozak, Victor R.

228

Virtualizing Operating Systems for Seamless Distributed Environments  

E-Print Network [OSTI]

Virtualizing Operating Systems for Seamless Distributed Environments 1 Tom Boyd and Partha Dasgupta. Abstract Applications and operating systems can be augmented with extra functionality by injecting bindings. This is called virtualiza- tion. We are developing a virtualizing Operating System (vOS) residing

Dasgupta, Partha

229

Alleviations of Substation Congestions by Distributed Generations â An Optimal Location and Reliability Analysis.  

E-Print Network [OSTI]

??With increased load demands from the customers, substation congestion problems have become inevitable to the utility companies. Instead of expanding related system installations to alleviate… (more)

Melvin, Galicia

2011-01-01T23:59:59.000Z

230

Application of systems engineering techniques (reliability, availability, maintainability, and dollars) to the Gas Centrifuge Enrichment Plant  

SciTech Connect (OSTI)

The systems engineering function for the Gas Centrifuge Enrichment Plant (GCEP) covers system requirements definition, analyses, verification, technical reviews, and other system efforts necessary to assure good balance of performance, safety, cost, and scheduling. The systems engineering function will support the design, installation, start-up, and operational phases of GCEP. The principal objectives of the systems engineering function are to: assure that the system requirements of the GCEP process are adequately specified and documented and that due consideration and emphasis are given to all aspects of the project; provide system analyses of the designs as they progress to assure that system requirements are met and that GCEP interfaces are compatible; assist in the definition of programs for the necessary and sufficient verification of GCEP systems; and integrate reliability, maintainability, logistics, safety, producibility, and other related specialties into a total system effort. This paper addresses the GCEP reliability, availability, maintainability, and dollars (RAM dollars) analyses which are the primary systems engineering tools for the development and implementation of trade-off studies. These studies are basic to reaching cost-effective project decisions. The steps necessary to achieve optimum cost-effective design are shown.

Boylan, J.G.; DeLozier, R.C.

1982-01-01T23:59:59.000Z

231

Strategy Guideline: Compact Air Distribution Systems  

SciTech Connect (OSTI)

This Strategy Guideline discusses the benefits and challenges of using a compact air distribution system to handle the reduced loads and reduced air volume needed to condition the space within an energy efficient home. Traditional systems sized by 'rule of thumb' (i.e., 1 ton of cooling per 400 ft2 of floor space) that 'wash' the exterior walls with conditioned air from floor registers cannot provide appropriate air mixing and moisture removal in low-load homes. A compact air distribution system locates the HVAC equipment centrally with shorter ducts run to interior walls, and ceiling supply outlets throw the air toward the exterior walls along the ceiling plane; alternatively, high sidewall supply outlets throw the air toward the exterior walls. Potential drawbacks include resistance from installing contractors or code officials who are unfamiliar with compact air distribution systems, as well as a lack of availability of low-cost high sidewall or ceiling supply outlets to meet the low air volumes with good throw characteristics. The decision criteria for a compact air distribution system must be determined early in the whole-house design process, considering both supply and return air design. However, careful installation of a compact air distribution system can result in lower material costs from smaller equipment, shorter duct runs, and fewer outlets; increased installation efficiencies, including ease of fitting the system into conditioned space; lower loads on a better balanced HVAC system, and overall improved energy efficiency of the home.

Burdick, A.

2013-06-01T23:59:59.000Z

232

Distributed Delays Stabilize Ecological Feedback Systems  

Science Journals Connector (OSTI)

We consider the effect of distributed delays in predator-prey models and ecological food webs. Whereas the occurrence of delays in population dynamics is usually regarded a destabilizing factor leading to the extinction of species, we here demonstrate complementarily that delay distributions yield larger stability regimes than single delays. Food webs with distributed delays closely resemble nondelayed systems in terms of ecological stability measures. Thus, we state that dependence of dynamics on multiple instances in the past is an important, but so far underestimated, factor for stability in dynamical systems.

Christian W. Eurich; Andreas Thiel; Lorenz Fahse

2005-04-22T23:59:59.000Z

233

An Optimized Adaptive Protection Scheme for Distribution Systems Penetrated with Distributed Generators  

Science Journals Connector (OSTI)

An intelligent adaptive protection scheme for distribution systems penetrated with distributed generators is proposed in this chapter. The scheme...

Ahmed H. Osman; Mohamed S. Hassan…

2014-01-01T23:59:59.000Z

234

Consortium for Electric Reliability Technology Solutions Grid of the Future White Paper on Review of Recent Reliability Issues and Systems Events  

SciTech Connect (OSTI)

This report is one of six reports developed under the U.S. Department of Energy (DOE) program in Power System Integration and Reliability (PSIR). The objective of this report is to review, analyze, and evaluate critical reliability issues demonstrated by recent disturbance events in the North America power system. Eleven major disturbances are examined, most occurring in this decade. The strategic challenge is that the pattern of technical need has persisted for a long period of time. For more than a decade, anticipation of market deregulation has been a major disincentive to new investments in system capacity. It has also inspired reduced maintenance of existing assets. A massive infusion of better technology is emerging as the final option to continue reliable electrical services. If an investment in better technology will not be made in a timely manner, then North America should plan its adjustments to a very different level of electrical service. It is apparent that technical operations staff among the utilities can be very effective at marshaling their forces in the immediate aftermath of a system emergency, and that serious disturbances often lead to improved mechanisms for coordinated operation. It is not at all apparent that such efforts can be sustained through voluntary reliability organizations in which utility personnel external to those organizations do most of the technical work. The eastern interconnection shows several situations in which much of the technical support has migrated from the utilities to the Independent System Operator (ISO), and the ISO staffs or shares staff with the regional reliability council. This process may be a natural and very positive consequence of utility restructuring. If so, the process should be expedited in regions where it is less advanced.

Hauer, John F.; Dagle, Jeffery E.

1999-12-01T23:59:59.000Z

235

Reliability of Calderbank-Shor-Steane Codes and Security of Quantum Key Distribution  

E-Print Network [OSTI]

After Mayers (1996, 2001) gave a proof of the security of the Bennett-Brassard 1984 (BB84) quantum key distribution protocol, Shor and Preskill (2000) made a remarkable observation that a Calderbank-Shor-Steane (CSS) code had been implicitly used in the BB84 protocol, and suggested its security could be proven by bounding the fidelity, say F(n), of the incorporated CSS code of length n in the form 1-F(n) 0 whenever R < R', which is larger than the achievable rate based on the Gilbert-Varshamov bound that is essentially due to Shor and Preskill (2000). The codes in the present work are robust against fluctuations of channel parameters, which fact is needed to establish the security rigorously and was not proved for rates above the Gilbert-Varshamov rate before in the literature. As a byproduct, the security of a modified BB84 protocol against any joint (coherent) attacks is proved quantitatively.

Mitsuru Hamada

2003-08-05T23:59:59.000Z

236

Relay coordination and protection failure effects on reliability indices in an interconnected sub-transmission system  

Science Journals Connector (OSTI)

Protection system failure is the main cause of cascading outages. It has been shown that the hidden failures lead to cascading outages. However, the effects of the coordination method as well as the hidden failure of the protection systems have not been investigated yet. In this paper, an algorithm based on sequential Monte Carlo simulation is proposed to find the reliability indices for different overcurrent relay coordination methods. The proposed algorithm is applied to the results of different relay coordination methods of a real network. The indices SAIFI, CAIDI, CAIFI and ENS for the results of different relay coordination methods are obtained strictly based on the contribution of the protection failure issues. Then, a comparison is made between the results of the different relay coordination methods in order to show how the coordination methods affect the reliability indices.

Kazem Mazlumi; Hossein Askarian Abyaneh

2009-01-01T23:59:59.000Z

237

Reliability evaluation for electrical collector systems of wind farm using the section enumeration technique  

Science Journals Connector (OSTI)

Topology has a significant effect on the reliability performance of an electrical collector system (ECS) of wind farms. Novel indices for the reliability of wind farm ECS are presented based on topological features of wind farm ECS in this paper. The concept of the section for a wind farm ECS is defined. The probability table of multistate capacity (PTMC) for a wind turbine generator (WTG) and the Probability Table of the Number of WTG in Up-state (PTNU) for a section can be created. Based on the PTMC and PTNU PTMC of a wind farm can be established using the state enumeration algorithm and the matrix operations. Therefore the reliability evaluation model considering effects of wind speed and component failures can be built. The proposed model not only considers the multi-failures of ECS components including failures of cable feeder WTG and wind turbine transformer (WTT) but also states of switching devices in failure disconnection and switching processes. Four wind farm ECS topologies i.e. radial topology single-sided ring topology double-sided ring topology and star topology are implemented. Case studies on the reliability evaluation of wind farm ECS are used to verify the feasibility and validity of the proposed technique.

Kaigui Xie; Hejun Yang; Bo Hu; David Yu

2013-01-01T23:59:59.000Z

238

Building a Smarter Distribution System in Pennsylvania  

Broader source: Energy.gov (indexed) [DOE]

Study - PPL Electric Utilities Corporation Smart Grid Investment Grant Study - PPL Electric Utilities Corporation Smart Grid Investment Grant 1 Building a Smarter Distribution System in Pennsylvania PPL Electric Utilities Corporation (PPL) provides electricity to 1.4 million customers across central and eastern Pennsylvania. Having installed smart meters and other advanced technologies over the last several years, PPL has experience with operating smart grid systems and achieving operational improvements. To further improve quality of service for its customers, PPL is implementing a $38 million Smart Grid Investment Grant, which includes $19 million in Recovery Act funds from the U.S. Department of Energy (DOE). PPL is installing a distribution management system (DMS), distribution automation (DA) devices, and supporting communication systems in a pilot program in the Harrisburg

239

RELY: A reliability modeling system for analysis of sodium-sulfur battery configurations  

SciTech Connect (OSTI)

In support of the Office of Energy Storage and Distribution of the US Department of Energy (DOE), Pacific Northwest Laboratory has produced a microcomputer-based software package, called RELY, to assess the impact of sodium-sulfur cell reliability on constant current discharge battery performance. The Fortran-based software operates on IBM microcomputers and IBM-compatibles that have a minimum of 512K of internal memory. The software package has three models that provide the following: (1) a description of the failure distribution parameters used to model cell failure, (2) a Monte Carlo simulation of battery life, and (3) a detailed discharge model for a user-specified battery discharge cycle. 6 refs., 31 figs., 4 tabs.

Hostick, C.J.; Huber, H.D.; Doggett, W.H.; Dirks, J.A.; Dovey, J.F.; Grinde, R.B.; Littlefield, J.S.; Cuta, F.M.

1987-06-01T23:59:59.000Z

240

Designing Safe, Reliable Systems using Scade Parosh Aziz Abdulla 1 , Johann Deneux 1 , Gunnar Stalmarck 2 , Herman Agren 2 ,  

E-Print Network [OSTI]

ways to verify that systems are reliable: -- Failure Mode and E#ect Analysis (FMEA). In this approach in order to make the system unsafe. Both FMEA and FTA are described in details in [VGRH81]. We have

Abdulla, Parosh Aziz

Note: This page contains sample records for the topic "distribution system reliability" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

Energy optimization of water distribution system  

SciTech Connect (OSTI)

In order to analyze pump operating scenarios for the system with the computer model, information on existing pumping equipment and the distribution system was collected. The information includes the following: component description and design criteria for line booster stations, booster stations with reservoirs, and high lift pumps at the water treatment plants; daily operations data for 1988; annual reports from fiscal year 1987/1988 to fiscal year 1991/1992; and a 1985 calibrated KYPIPE computer model of DWSD`s water distribution system which included input data for the maximum hour and average day demands on the system for that year. This information has been used to produce the inventory database of the system and will be used to develop the computer program to analyze the system.

Not Available

1993-02-01T23:59:59.000Z

242

System Integration of Distributed Power for Complete Building Systems: Phase 1 Report  

SciTech Connect (OSTI)

This report describes NiSource Energy Technologies Inc.'s base year of a planned 3-year effort to advance distributed power development, deployment, and integration. Its long-term goal is to design ways to extend distributed generation into the physical design and controls of buildings. NET worked to meet this goal through advances in the implementation and control of CHP systems in end-user environments and a further understanding of electric interconnection and siting issues. Important results from the first year were a survey of the state of the art of interconnection issues associated with distributed generation, a survey of the local zoning requirements for the NiSource service territory, and the acquisition of data about the operation, reliability, interconnection, and performance of CHP systems and components of two test sites.

Kramer, R.

2003-12-01T23:59:59.000Z

243

A Queueing Based Scheduling Approach to Plug-In Electric Vehicle Dispatch in Distribution Systems  

E-Print Network [OSTI]

Large-scale integration of plug-in electric vehicles (PEV) in power systems can cause severe issues to the existing distribution system, such as branch congestions and significant voltage drops. As a consequence, smart charging strategies are crucial for the secure and reliable operation of the power system. This paper tries to achieve high penetration level of PEVs with the existing distribution system infrastructure by proposing a smart charging algorithm that can optimally utilize the distribution system capacity. Specifically, the paper proposes a max-weight PEV dispatch algorithm to control the PEV charging rates, subject to power system physical limits. The proposed max-weight PEV dispatch algorithm is proved to be throughput optimal under very mild assumptions on the stochastic dynamics in the system. This suggests that the costly distribution system infrastructure upgrade can be avoided, or failing that, at least successfully deferred. The proposed PEV dispatch algorithm is particularly attractive in ...

Li, Qiao; Ilic, Marija D

2012-01-01T23:59:59.000Z

244

Reliability assessment of Passive Containment Cooling System of an Advanced Reactor using APSRA methodology  

Science Journals Connector (OSTI)

Abstract Passive Systems are increasingly playing a prominent role in the advanced nuclear reactor systems and are being utilised in normal operations as well as safety systems of the reactors following an accident. The Passive Containment Cooling System (PCCS) is one of the several passive safety features in an Advanced Reactor (AHWR). In this paper, the APSRA methodology has been employed for reliability evaluation of the PCCS of AHWR. Performance assessment of the PCCS is initially performed during a postulated design basis LOCA using the best-estimate code RELAP5/Mod 3.2. The parameters affecting the system performance are then identified and considered for further analysis. Based on some pre-determined failure criterion, the failure surface for the system is predicted using the best-estimate code taking into account the deviations of the identified parameters from their nominal states as well as the model uncertainties inherent to the best estimate code. Root diagnosis is then carried out to determine the various failure causes, which occurs mainly due to malfunctioning of mechanical components. The failure probabilities of the various components are assessed through a classical PSA treatment using generic data. The reliability of the PCCS is then evaluated from the probability of availability of these components.

Mukesh Kumar; Aranyak Chakravarty; A.K. Nayak; Hari Prasad; V. Gopika

2014-01-01T23:59:59.000Z

245

Reliability study of Stirling engines for solar dish/heat engine systems  

SciTech Connect (OSTI)

The objective of this study was to examine the reliability of existing and improved Stirling engine concepts for dispersed solar dish-electric applications in the 25-50 kWe range. Five current kinematic Stirling engine designs have the capability to meet or exceed the 32% efficiency goal of the DOE Solar Thermal Program. A review of historical Stirling engine data illustrated that the three major reliability issues with kinematic Stirling engines are the piston-rod seals, engine hot parts (i.e., heater head, regenerator and cylinders) and power control/drive system. The most significant reliability issue associated with achieving the 50,000 hour operating life goal involves piston-rod seals. A specific kinematic engine concept that appears to have the potential for meeting the 50,000 hour operating lifetime requirement of solar power systems is the STM4-120 engine. This engine has a pressurized crankcase to reduce piston-rod seal problems, an indirect heat pipe hot-end section to smooth out temperature gradients in the heater tubes, and a variable angle swashplate for power control.

Holtz, R.E.; Uherka, K.L.

1987-05-01T23:59:59.000Z

246

Distributed Generation Systems Inc | Open Energy Information  

Open Energy Info (EERE)

Distributed Generation Systems Inc Distributed Generation Systems Inc Name Distributed Generation Systems Inc Address 200 Union Blvd Place Lakewood, Colorado Zip 80228 Sector Wind energy Product Developer of electricity generation wind power facilities Website http://www.disgenonline.com/ Coordinates 39.718048°, -105.1324055° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":39.718048,"lon":-105.1324055,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

247

Multiobjective electric distribution system expansion planning using hybrid energy hub concept  

Science Journals Connector (OSTI)

This paper presents a novel approach for optimal electric distribution system expansion planning (OEDSEP) using a hybrid energy hub concept. The proposed method uses an energy hub model to explore the impacts of energy carrier systems on OEDSEP procedure. This algorithm decomposes the OEDSEP problem into three subproblems to achieve an optimal expansion planning of a system in which the investment and operational costs are minimized, while the reliability of the system is maximized. The algorithm was successfully tested in the present research for an urban distribution system.

Mehrdad Setayesh Nazar; Mahmood R. Haghifam

2009-01-01T23:59:59.000Z

248

Systems Analysis Programs for Hands-on Integrated Reliability Evaluations (SAPHIRE) Quality Assurance Manual  

SciTech Connect (OSTI)

The Systems Analysis Programs for Hands-on Integrated Reliability Evaluations (SAPHIRE) is a software application developed for performing a complete probabilistic risk assessment using a personal computer running the Microsoft Windows operating system. SAPHIRE is primarily funded by the U.S. Nuclear Regulatory Commission (NRC). The role of the INL in this project is that of software developer and tester. This development takes place using formal software development procedures and is subject to quality assurance (QA) processes. The purpose of this document is to describe how the SAPHIRE software QA is performed for Version 6 and 7, what constitutes its parts, and limitations of those processes.

C. L. Smith; R. Nims; K. J. Kvarfordt; C. Wharton

2008-08-01T23:59:59.000Z

249

Interconnecting PV on New York City's Secondary Network Distribution System  

SciTech Connect (OSTI)

The U.S. Department of Energy (DOE) has teamed with cities across the country through the Solar America Cities (SAC) partnership program to help reduce barriers and accelerate implementation of solar energy. The New York City SAC team is a partnership between the City University of New York (CUNY), the New York City Mayor s Office of Long-term Planning and Sustainability, and the New York City Economic Development Corporation (NYCEDC).The New York City SAC team is working with DOE s National Renewable Energy Laboratory (NREL) and Con Edison, the local utility, to develop a roadmap for photovoltaic (PV) installations in the five boroughs. The city set a goal to increase its installed PV capacity from1.1 MW in 2005 to 8.1 MW by 2015 (the maximum allowed in 2005). A key barrier to reaching this goal, however, is the complexity of the interconnection process with the local utility. Unique challenges are associated with connecting distributed PV systems to secondary network distribution systems (simplified to ���¢��������networks���¢������� in this report). Although most areas of the country use simpler radial distribution systems to distribute electricity, larger metropolitan areas like New York City typically use networks to increase reliability in large load centers. Unlike the radial distribution system, where each customer receives power through a single line, a network uses a grid of interconnected lines to deliver power to each customer through several parallel circuits and sources. This redundancy improves reliability, but it also requires more complicated coordination and protection schemes that can be disrupted by energy exported from distributed PV systems. Currently, Con Edison studies each potential PV system in New York City to evaluate the system s impact on the network, but this is time consuming for utility engineers and may delay the customer s project or add cost for larger installations. City leaders would like to streamline this process to facilitate faster, simpler, and less expensive distributed PV system interconnections. To assess ways to improve the interconnection process, NREL conducted a four-part study with support from DOE. The NREL team then compiled the final reports from each study into this report. In Section 1���¢��������PV Deployment Analysis for New York City���¢��������we analyze the technical potential for rooftop PV systems in the city. This analysis evaluates potential PV power production in ten Con Edison networks of various locations and building densities (ranging from high density apartments to lower density single family homes). Next, we compare the potential power production to network loads to determine where and when PV generation is most likely to exceed network load and disrupt network protection schemes. The results of this analysis may assist Con Edison in evaluating future PV interconnection applications and in planning future network protection system upgrades. This analysis may also assist other utilities interconnecting PV systems to networks by defining a method for assessing the technical potential of PV in the network and its impact on network loads. Section 2���¢��������A Briefing for Policy Makers on Connecting PV to a Network Grid���¢��������presents an overview intended for nontechnical stakeholders. This section describes the issues associated with interconnecting PV systems to networks, along with possible solutions. Section 3���¢��������Technical Review of Concerns and Solutions to PV Interconnection in New Y

K. Anderson; M. Coddington; K. Burman; S. Hayter; B. Kroposki; and A. Watson

2009-11-30T23:59:59.000Z

250

Wavelet technique based islanding detection and improved repetitive current control for reliable operation of grid-connected PV systems  

Science Journals Connector (OSTI)

Abstract Recent years have witnessed a thrust towards the use of solar energy as the major renewable energy source for distributed power generation. The proposed system requires reliable detection technique and suitable current control strategy for proper operation. This paper focuses on plug-in repetitive current (RC) control strategy for grid connected inverter system and wavelet technique for electrical grid status identification. The performance of proposed current control technique employed for grid connected inverter system under distorted and unbalanced grid voltage is compared with the existing conventional methods like PI and PR controller. This controller uses the feedback control system for attenuating periodic disturbances, improving high quality sinusoidal output current and high power factor. The proposed scheme employs fourth order infinite impulse response (IIR) filter for maintaining its resonance frequency, output frequency matching with grid fundamental frequency and reduction of harmonics. The DC-DC boost converter implements incremental conductance based (INC) maximum power point tracker (MPPT) algorithm. The effects of LCL filter for improving disturbance rejection capability and dynamic performance of the proposed system is also demonstrated. Grid connected PV inverter employs wavelet technique for an islanding detection functionality in order to determine the status of the electrical grid. In order to show the effectiveness of the proposed algorithm, modeling and simulation for grid connected PV system is performed using MATLAB/SIMULINK and its PowerSim toolbox.

Smitha Joyce Pinto; Gayadhar Panda

2015-01-01T23:59:59.000Z

251

Integration of HVAC System Design with Simplified Duct Distribution...  

Broader source: Energy.gov (indexed) [DOE]

Integration of HVAC System Design with Simplified Duct Distribution - Building America Top Innovation Integration of HVAC System Design with Simplified Duct Distribution - Building...

252

Distributed/Stationary Fuel Cell Systems | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

DistributedStationary Fuel Cell Systems DistributedStationary Fuel Cell Systems Photo of stationary fuel cell The Department of Energy (DOE) is developing high-efficiency fuel...

253

Dynamic reliability and risk assessment of the accident localization system of the Ignalina NPP RBMK-1500 reactor  

Science Journals Connector (OSTI)

The paper presents reliability and risk analysis of the RBMK-1500 reactor accident localization system (ALS) (confinement), which prevents radioactive releases to the environment. Reliability of the system was estimated and compared by two methods: the conventional fault tree method and an innovative dynamic reliability model, based on stochastic differential equations. Frequency of radioactive release through ALS was also estimated. The results of the study indicate that conventional fault tree modeling techniques in this case apply high degree of conservatism in the system reliability estimates. One of the purposes of the ALS reliability study was to demonstrate advantages of the dynamic reliability analysis against the conventional fault/event tree methods. The Markovian framework to deal with dynamic aspects of system behavior is presented. Although not analyzed in detail, the framework is also capable of accounting for non-constant component failure rates. Computational methods are proposed to solve stochastic differential equations, including analytical solution, which is possible only for relatively small and simple systems. Other numerical methods, like Monte Carlo and numerical schemes of differential equations are analyzed and compared. The study is finalized with concluding remarks regarding both the studied system reliability and computational methods used.

V. Kopustinskas; J. Augutis; S. Rimkevi?ius

2005-01-01T23:59:59.000Z

254

World Class Boilers and Steam Distribution System  

E-Print Network [OSTI]

WORLD CLASS BOILERS AND STEAM DISTRIBUTION SYSTEM Vernon P. Portell, Ph.D. Manager Armstrong Service, Inc. ABSTRACT categorizing, measuring, and comparing subjects which are of interest to us is the way we identify the "World class" is a... of information can also be obtained through an independent firm that provides third-party assessment of steam systems. One of these third parties, Armstrong Energy Certification, Inc., has used data gleaned from decades of industrial experience...

Portell, V. P.

255

The Reliability Investigation on ACSR Splice Connector Systems Used in Overhead Power transmission Lines  

SciTech Connect (OSTI)

Due to material discontinuity and inherited forming mechanism from a crimped-type splice connector, the associated conductor-connector system is highly sensitive to system components aging, especially during high-temperature operations. Furthermore, due to the increase in power demand and limited investment in new infrastructure, existing overhead power transmission lines often need to operate at temperatures higher than the original designed values. This has led to the accelerated aging and degradation of conductor-connector systems. The implications of connector aging are two-fold: (1) significant increase in resistivity of the splice connector and (2) significant reduction in the connector clamping strength. Therefore, splice connectors are one of the weakest links in the electric power transmission infrastructure. In this paper we will discuss the reliability of splice connector systems, including both single stage and two stage splice connectors, used in ACSR conductor of transmission lines under high temperature operations.

Wang, Jy-An John [ORNL] [ORNL; Jiang, Hao [ORNL] [ORNL; Ren, Fei [ORNL] [ORNL

2012-01-01T23:59:59.000Z

256

Senslide: a distributed landslide prediction system  

Science Journals Connector (OSTI)

We describe the design, implementation, and current status of Senslide, a distributed sensor system aimed at predicting landslides in the hilly regions of western India. Landslides in this region occur during the monsoon rains and cause significant damage ... Keywords: fault tolerant, landslide prediction, sensor network application

Anmol Sheth; Chandramohan A. Thekkath; Prakshep Mehta; Kalyan Tejaswi; Chandresh Parekh; Trilok N. Singh; Uday B. Desai

2007-04-01T23:59:59.000Z

257

Clock and timing distribution in the LHCb upgraded detector and readout system  

E-Print Network [OSTI]

The LHCb experiment is upgrading part of its detector and the entire readout system towards a full 40 MHz readout system in order to run between five and ten times its initial design luminosity and increase its trigger efficiency. In this paper, the new timing, trigger and control distribution system for such an upgrade is reviewed with particular attention given to the distribution of the clock and timing information across the entire readout system, up to the FE and the on-detector electronics. Current ideas are here presented in terms of reliability, jitter, complexity and implementation.

Alessio, F; Barros Marin, M; Cachemiche, JP; Hachon, F; Jacobsson, R; Wyllie, K

2014-01-01T23:59:59.000Z

258

LHCb : Clock and timing distribution in the LHCb upgraded detector and readout system  

E-Print Network [OSTI]

The LHCb experiment is upgrading part of its detector and the entire readout system towards a full 40 MHz readout system in order to run between five and ten times its initial design luminosity and increase its trigger efficiency. In this paper, the new timing, trigger and control distribution system for such an upgrade is reviewed with particular attention given to the distribution of the clock and timing information across the entire readout system, up to the FE and the on-detector electronics. Current ideas are here presented in terms of reliability, jitter, complexity and implementation.

Alessio, Federico; Barros Marin, M; Cachemiche, JP; Hachon, F; Jacobsson, Richard; Wyllie, Ken

2014-01-01T23:59:59.000Z

259

Natural Circulation in Water Cooled Nuclear Power Plants Phenomena, models, and methodology for system reliability assessments  

SciTech Connect (OSTI)

In recent years it has been recognized that the application of passive safety systems (i.e., those whose operation takes advantage of natural forces such as convection and gravity), can contribute to simplification and potentially to improved economics of new nuclear power plant designs. In 1991 the IAEA Conference on ''The Safety of Nuclear Power: Strategy for the Future'' noted that for new plants the use of passive safety features is a desirable method of achieving simplification and increasing the reliability of the performance of essential safety functions, and should be used wherever appropriate''.

Jose Reyes

2005-02-14T23:59:59.000Z

260

Impact of dispersed solar and wind systems on electric distribution planning and operation  

SciTech Connect (OSTI)

Small-scale dispersed solar photovoltaic and wind generation (DSW) will affect the generation, transmission, and distribution systems of an electric utility. This study examines the technical and economic impacts of dispersing DSW devices within the distribution system. Dispersed intermittent generation is included. Effects of DSW devices on capital investments, reliability, operating and maintenance costs, protection requirements, and communication and control requirements are examined. A DSW operation model is developed to help determine the dependable capacity of fluctuating solar photovoltaic and wind generation as part of the distribution planning process. Specific case studies using distribution system data and renewable resource data for Southern California Edison Company and Consumers Power Company are analyzed to gain insights into the effects of interconnecting DSW devices. The DSW devices were found to offer some distribution investment savings, depending on their availability during peak loads. For a summer-peaking utility, for example, dispersing photovoltaic systems is more likely to defer distribution capital investments than dispersing wind systems. Dispersing storage devices to increase DSW's dependable capacity for distribution systems needs is not economically attractive. Substation placement of DSW and storage devices is found to be more cost effective than feeder or customer placement. Examination of the effects of DSW on distribution system operation showed that small customer-owned DSW devices are not likely to disrupt present time-current distribution protection coordination. Present maintenance work procedures, are adequate to ensure workmen's safety. Regulating voltages within appropriate limits will become more complex with intermittent generation along the distribution feeders.

Boardman, R.W.; Patton, R.; Curtice, D.H.

1981-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "distribution system reliability" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

DOE Action Plan Addressing the Electricity Distribution System  

Broader source: Energy.gov (indexed) [DOE]

ACTION PLAN ACTION PLAN ADDRESSING THE ELECTRICITY DISTRIBUTION SYSTEM ~DRAFT~ DOE Action Plan Addressing the Electricity Distribution System 1 Table of Contents INTRODUCTION ................................................................................................................... 2 The Grid Tech Team ................................................................................................ 2 Focus on Distribution .............................................................................................. 3 Roadmap Goals ....................................................................................................... 3 PROCESS OVERVIEW ........................................................................................................... 4

262

Laser spark distribution and ignition system  

DOE Patents [OSTI]

A laser spark distribution and ignition system that reduces the high power optical requirements for use in a laser ignition and distribution system allowing for the use of optical fibers for delivering the low peak energy pumping pulses to a laser amplifier or laser oscillator. An optical distributor distributes and delivers optical pumping energy from an optical pumping source to multiple combustion chambers incorporating laser oscillators or laser amplifiers for inducing a laser spark within a combustion chamber. The optical distributor preferably includes a single rotating mirror or lens which deflects the optical pumping energy from the axis of rotation and into a plurality of distinct optical fibers each connected to a respective laser media or amplifier coupled to an associated combustion chamber. The laser spark generators preferably produce a high peak power laser spark, from a single low power pulse. The laser spark distribution and ignition system has application in natural gas fueled reciprocating engines, turbine combustors, explosives and laser induced breakdown spectroscopy diagnostic sensors.

Woodruff, Steven (Morgantown, WV); McIntyre, Dustin L. (Morgantown, WV)

2008-09-02T23:59:59.000Z

263

Distributed computer controls for accelerator systems  

SciTech Connect (OSTI)

A distributed control system has been designed and installed at the Lawrence Livermore National Laboratory Multi-user Tandem Facility using an extremely modular approach in hardware and software. The two tiered, geographically organized design allowed total system implementation with four months with a computer and instrumentation cost of approximately $100K. Since the system structure is modular, application to a variety of facilities is possible. Such a system allows rethinking and operational style of the facilities, making possible highly reproducible and unattended operation. The impact of industry standards, i.e., UNIX, CAMAC, and IEEE-802.3, and the use of a graphics-oriented controls software suite allowed the efficient implementation of the system. The definition, design, implementation, operation and total system performance will be discussed. 3 refs.

Moore, T.L.

1988-09-01T23:59:59.000Z

264

Log Summarization and Anomaly Detection for TroubleshootingDistributed Systems  

SciTech Connect (OSTI)

Today's system monitoring tools are capable of detectingsystem failures such as host failures, OS errors, and network partitionsin near-real time. Unfortunately, the same cannot yet be said of theend-to-end distributed softwarestack. Any given action, for example,reliably transferring a directory of files, can involve a wide range ofcomplex and interrelated actions across multiple pieces of software:checking user certificates and permissions, getting details for allfiles, performing third-party transfers, understanding re-try policydecisions, etc. We present an infrastructure for troubleshooting complexmiddleware, a general purpose technique for configurable logsummarization, and an anomaly detection technique that works in near-realtime on running Grid middleware. We present results gathered using thisinfrastructure from instrumented Grid middleware and applications runningon the Emulab testbed. From these results, we analyze the effectivenessof several algorithms at accurately detecting a variety of performanceanomalies.

Gunter, Dan; Tierney, Brian L.; Brown, Aaron; Swany, Martin; Bresnahan, John; Schopf, Jennifer M.

2007-08-01T23:59:59.000Z

265

An analysis of the reliability of the Los Alamos National Laboratory electrical system  

SciTech Connect (OSTI)

This paper discusses the results of a study of the reliability of the Los Alamos National Laboratory electrical system and an assessment of the risk arising from power interruptions and outages. Our study was intended to provide a current status of the system and to rank upgrades to improve the system. In this study, we used fault-tree analysis, cause-consequence analysis, and directed graphs. The study resulted in a ranking of the relative importance of the consequences of power loss to various Los Alamos technical sites and facilities, sets of equipment whose failure will lead to loss of power to the sites, and statistical estimates of the frequency of power loss to sites and facilities. 1 tab.

Bott, T.F.

1990-01-01T23:59:59.000Z

266

Reliability Engineering and System Safety 92 (2007) 609618 The nuclear industry's transition to risk-informed regulation and  

E-Print Network [OSTI]

Reliability Engineering and System Safety 92 (2007) 609­618 The nuclear industry's transition a Nuclear Science and Engineering Department, Massachusetts Institute of Technology, Cambridge, MA 02139, USA b Nuclear Power Engineering, Quality and Safety Management Department, Tokyo Electric Power

267

Power Systems Engineering Research Center Using Active Customer Participation  

E-Print Network [OSTI]

components and distribution system reliability. The time-varying nature of these resources will alter to improve distribution system reliability. An approach to manage the distribution system assets under are in the area of distribution system automation, reliability enhancement through smart distribution systems

Van Veen, Barry D.

268

Reliability of the Beam Loss Monitors System for the Large Hadron Collider at CERN  

E-Print Network [OSTI]

The energy stored in the Large Hadron Collider is unprecedented. The impact of the beam particles can cause severe damage on the superconductive magnets, resulting in significant downtime for repairing. The Beam Loss Monitors System (BLMS) detects the secondary particles shower of the lost beam particles and initiates the extraction of the beam before any serious damage to the equipment can occur. This thesis defines the BLMS specifications in term of reliability. The main goal is the design of a system minimizing both the probability to not detect a dangerous loss and the number of false alarms generated. The reliability theory and techniques utilized are described. The prediction of the hazard rates, the testing procedures, the Failure Modes Effects and Criticalities Analysis and the Fault Tree Analysis have been used to provide an estimation of the probability to damage a magnet, of the number of false alarms and of the number of generated warnings. The weakest components in the BLMS have been pointed out....

Guaglio, G; Santoni, C

2005-01-01T23:59:59.000Z

269

The application of Plant Reliability Data Information System (PRINS) to CANDU reactor  

SciTech Connect (OSTI)

As risk-informed applications (RIAs) are actively implanted in the nuclear industry, an issue associated with technical adequacy of Probabilistic Safety Assessment (PSA) arises in its modeling and data sourcing. In Korea, PSA for all Korean NPPs has been completed and KHNP(Korea Hydro and Nuclear Power Plant Company) developed the database called the Plant Reliability Data Information System (PRinS). It has several characteristics that distinguish it from other database system such as NPRDs (INPO,1994), PRIS (IAEA), and SRDF (EdF). This database has the function of systematic data management such as automatic data-gathering, periodic data deposition and updating, statistical analysis including Bayesian method, and trend analysis of failure rate or unavailability. In recent PSA for CANDU reactor, the component failure data of EPRI ALWR URD and Component Reliability Database were preferentially used as generic data set. The error factor for most component failure data was estimated by using the information NUREG/CR-4550 and NUREG/CR-4639. Also, annual trend analysis was performed for the functional losses of components using the statistical analysis and chart module of PRinS. Furthermore, the database has been updated regularly and maintained as a living program to reflect the current status. This paper presents the failure data analysis using PRinS which provides Bayesian analysis on main components in the CANDU reactor. (authors)

Hwang, S. W.; Lim, Y. H.; Park, H. C. [Korea Hydro and Nuclear Power Co., Ltd., Naah-ri 260, Yangnam-myun, Gyeongju-si, Gyeong Buk (Korea, Republic of)

2012-07-01T23:59:59.000Z

270

Distributed Energy Systems Corp | Open Energy Information  

Open Energy Info (EERE)

Systems Corp Systems Corp Jump to: navigation, search Name Distributed Energy Systems Corp Place Wallingford, Connecticut Zip CT 06492 Product The former holding company of Proton Energy Systems and Northern Power Systems that ceased to operate upon the sale of both subsidiaries. Coordinates 43.473755°, -72.976925° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":43.473755,"lon":-72.976925,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

271

Uncertainty evaluation of reliability of safety grade decay heat removal system of Indian prototype fast breeder reactor  

Science Journals Connector (OSTI)

Abstract Deterministic and probabilistic safety assessment of nuclear power reactor technology is very important in assuring that the design is robust and safety systems perform as per requirement. The parameters required as input data for such analysis have uncertainties associated with them. Their impact is to be assessed on the results obtained for such analyses and it affects the overall decision making process. Safety Grade Decay Heat Removal System (SGDHRS) is one of the safety systems in fast breeder reactors and itremoves decay heat after reactor shutdown. It is a critical safety system; hence failure frequency for SGDHR is targeted to be less than 1.0 × 10?7 per reactor year. By bringing diversity in some of the components of SGDHRS, such as sodium-to-sodium decay heat exchanger (DHX), sodium to air heat exchanger (AHX) and valves, one can achieve the targeted low failure frequency of SGDHRS. We perform uncertainty analysis of the reliability of such SGDHRS here. Uncertainty in failure rate (of components of SGDHRS) is assumed to follow the log-normal distribution with error factor of three. Monte Carlo method of sampling is used in MATLAB environment. Results are obtained in terms of mean, median and standard deviation values of failure frequency. Percentile and confidence interval analysis of mean values are also obtained. These provide 95 and 98 percentile and confidence interval values of 98%, 99% and 99.8%. It is found that error factor of failure frequency of SGDHRS is found to be less than 3 in all the cases except the one in which DHX, AHX and Valves are designed with diversity in design. It is to be noted here that error factor of all input parameters distribution is taken as 3.

H.L. Kumawat; Om Pal Singh; Prabhat Munshi

2013-01-01T23:59:59.000Z

272

Integrated Computing, Communication, and Distributed Control of Deregulated Electric Power Systems  

SciTech Connect (OSTI)

Restructuring of the electricity market has affected all aspects of the power industry from generation to transmission, distribution, and consumption. Transmission circuits, in particular, are stressed often exceeding their stability limits because of the difficulty in building new transmission lines due to environmental concerns and financial risk. Deregulation has resulted in the need for tighter control strategies to maintain reliability even in the event of considerable structural changes, such as loss of a large generating unit or a transmission line, and changes in loading conditions due to the continuously varying power consumption. Our research efforts under the DOE EPSCoR Grant focused on Integrated Computing, Communication and Distributed Control of Deregulated Electric Power Systems. This research is applicable to operating and controlling modern electric energy systems. The controls developed by APERC provide for a more efficient, economical, reliable, and secure operation of these systems. Under this program, we developed distributed control algorithms suitable for large-scale geographically dispersed power systems and also economic tools to evaluate their effectiveness and impact on power markets. Progress was made in the development of distributed intelligent control agents for reliable and automated operation of integrated electric power systems. The methodologies employed combine information technology, control and communication, agent technology, and power systems engineering in the development of intelligent control agents for reliable and automated operation of integrated electric power systems. In the event of scheduled load changes or unforeseen disturbances, the power system is expected to minimize the effects and costs of disturbances and to maintain critical infrastructure operational.

Bajura, Richard; Feliachi, Ali

2008-09-24T23:59:59.000Z

273

Phonon distribution in a model polariton system  

Science Journals Connector (OSTI)

We consider a simple model polariton problem and show that the phonons in this system will never exhibit sub-Poissonian statistics. We furthermore observe that the probability distribution of the phonons will be classical at all temperatures, although the polariton complex as a whole can have a nonclassical behavior below a threshold temperature whose value will depend on the photon-phonon coupling strength.

Sharmishtha Ghoshal and Ashok Chatterjee

1995-07-01T23:59:59.000Z

274

[An improved, more reliable and more marketable version of the Automatic Metering System  

SciTech Connect (OSTI)

Texas Research Institute Austin, Inc. (TRI/Austin) was tasked by Letco International to evaluate its Automatic Metering System (AMS), a proportional controller for heat tracing cable. The original objectives were focused primarily on the reliability of the AMS controller. However, from the time of the original TRI/Austin proposal, the AMS device evolved beyond the prototype level into an established market product with sufficient operational experience and data that product reliability evaluation was not a significant test objective. The goals of this effort have been to determine the relative energy usage of the AMS proportional control compared to existing thermostatic control in a realistic freeze protection installation (low temperature test), to perform an accelerated life test for self limiting heat tracing cables to determine the service life impact of AMS control vs. thermostat control, and to perform a reliability analysis of the AMS device according to the 1986 edition of MIL-HDBK-217E [1] specifications. TRI/Austin designed and constructed a test set-up for conducting the low temperature test and the accelerated life test. A conceptual diagram of the test hardware is shown in Figure 1. The control computer was programmed to monitor and collect data from both tests in parallel, using the relay box and control circuitry fabricated at TRI/Austin. Test data and control commands were transmitted to and from the computer via standard parallel and serial interfaces. The AMS controller and relay box switched the power to the test cables, the commercial freezer, and the ALT chamber.

Patas, J.E.

1993-07-01T23:59:59.000Z

275

Reliability-based characterization of prefabricated FRP composites for rehabilitation of concrete structures  

E-Print Network [OSTI]

or nonnormal distributions; the reliability index ? dependsOF DISTRIBUTION FITTING ROUTINE %Calculation of ReliabilityDistribution and Distribution Parameters of Resistance Variables Considered for Reliability

Jin, Sung-Jun

2008-01-01T23:59:59.000Z

276

Modelling repairable system reliability with explanatory variables and repair and maintenance actions  

Science Journals Connector (OSTI)

......hazards modeling in reliability analysis-an application to...model to light water reactor component failure data...SGATTI,S.(2003) Reliability in automotive electronics...1972a) The statistical analysis of dependencies in point......

Diederik Lugtigheid; agan Banjevic; Andrew K. S. Jardine

2004-04-01T23:59:59.000Z

277

Advanced Non-Distributed Operating Systems Course Yair Wiseman  

E-Print Network [OSTI]

1 Advanced Non-Distributed Operating Systems Course Yair Wiseman Computer Science Department Bar://www.cs.biu.ac.il/~wiseman wiseman@cs.huji.ac.il Keywords: Operating Systems, Graduate Course, Operating System Kernel, Non-Distributed Operating Systems. Abstract The use of Non-Distributed Operating Systems is very common and old. Many

Wiseman, Yair

278

Distributed digital real-time control system for TCV tokamak  

Science Journals Connector (OSTI)

Abstract A new digital feedback control system (named the SCD “Systčme de Contrôle Distribué”) has been developed, integrated and used successfully to control TCV (Tokamak ŕ Configuration Variable) plasmas. The system is designed to be modular, distributed, and scalable, accommodating hundreds of diagnostic inputs and actuator outputs. With many more inputs and outputs available than previously possible, it offers the possibility to design advanced control algorithms with better knowledge of the plasma state and to coherently control all TCV actuators, including poloidal field (PF) coils, gas valves, the gyrotron powers and launcher angles of the electron cyclotron heating and current drive system (ECRH/ECCD) together with diagnostic triggering signals. The system consists of multiple nodes; each is a customised Linux desktop or embedded PC which may have local ADC and DAC cards. Each node is also connected to a memory network (reflective memory) providing a reliable, deterministic method of sharing memory between all nodes. Control algorithms are programmed as block diagrams in Matlab-Simulink providing a powerful environment for modelling and control design. The C code is generated automatically from the Simulink block diagram and compiled, with the Simulink Embedded Coder (SEC, formerly Real-Time Workshop Embedded Coder), into a Linux shared library (“.so” file) and distributed to target nodes in the discharge preparation phase. During the TCV discharge, an application on each node is executed that dynamically loads the shared library at runtime. In order to obtain reliable and reproducible real time execution of the algorithm, all interrupts to the CPU on each node are suspended just before firing the shot and re-enabled afterwards. Since installation, the new digital control system has been used for a multitude of plasma control applications, ranging from basic experiments of coil current and density control to advanced experiments of MHD (magnetohydrodynamics) and plasma profile control, as well as real-time plasma transport simulations. Recently, a real-time version of a plasma equilibrium reconstruction code was developed and implemented, providing the future possibility to control the plasma shape and profiles directly during the discharge evolution. This paper presents the architecture of the new control system, its integration into the TCV plant and a sample of control applications used for TCV plasma discharges.

H.B. Le; F. Felici; J.I. Paley; B.P. Duval; J.-M. Moret; S. Coda; O. Sauter; D. Fasel; P. Marmillod

2014-01-01T23:59:59.000Z

279

Reliability Calculus: A Theoretical Framework To Analyze Communication Reliability  

E-Print Network [OSTI]

distribution function (CDF) of the message delays can be used as a metric to infer communication reliability. Note that the communication reliability (end-to-end delay distribution) depends on the delay-to-end delay distribution over possible routes and under different protocols to provide reliability or quality

Liu, Xue

280

Energy performance of underfloor air distribution systems  

E-Print Network [OSTI]

Underfloor Air Distribution (UFAD) Design Guide.  Atlanta: distribution, UFAD, EnergyPlus, EnergyPlus/UFAD, energy  modeling, design design calculations must account for the distribution of 

Bauman, Fred; Webster, Tom; Linden, Paul; Buhl, Fred

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "distribution system reliability" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Short Term Load Forecasting with Fuzzy Logic Systems for power system planning and reliability?A Review  

Science Journals Connector (OSTI)

Load forecasting is very essential to the operation of Electricity companies. It enhances the energy efficient and reliable operation of power system. Forecasting of load demand data forms an important component in planning generation schedules in a power system. The purpose of this paper is to identify issues and better method for load foecasting. In this paper we focus on fuzzy logic system based short term load forecasting. It serves as overview of the state of the art in the intelligent techniques employed for load forecasting in power system planning and reliability. Literature review has been conducted and fuzzy logic method has been summarized to highlight advantages and disadvantages of this technique. The proposed technique for implementing fuzzy logic based forecasting is by Identification of the specific day and by using maximum and minimum temperature for that day and finally listing the maximum temperature and peak load for that day. The results show that Load forecasting where there are considerable changes in temperature parameter is better dealt with Fuzzy Logic system method as compared to other short term forecasting techniques.

R. M. Holmukhe; Mrs. Sunita Dhumale; Mr. P. S. Chaudhari; Mr. P. P. Kulkarni

2010-01-01T23:59:59.000Z

282

Using ductwork to improve supply plenum temperature distribution in underfloor air distribution (UFAD) system  

E-Print Network [OSTI]

overhead air distribution design(1). 1.3 Thermal comfortS. Under Floor Air Distribution (UFAD) Design Guide. s.l. :load design tool for underfloor air distribution systems.

Pasut, Wilmer

2011-01-01T23:59:59.000Z

283

North American Electric Reliability Corporation (NERC): Reliability...  

Broader source: Energy.gov (indexed) [DOE]

and winter and summer forecasts; monitors the bulk power systems; and educates, trains, and certifies industry personnel. North American Electric Reliability Corporation...

284

The development of a high reliability auxiliary power system for a coal-fired cycling generating station  

SciTech Connect (OSTI)

An auxiliary system for a fossil generating station is evolved based on operating and reliability criteria including the capabilities of switchgear and standard auxiliary transformer impedances. These criteria are used to design a flexible and reliable auxiliary power system for a cyclic duty power generating station. The effect of mechanical equipment selection on the auxiliary power system design is discussed. An economic comparison of single voltage versus dual-voltage is made. A one-line diagram of the resulting proposed system is included.

Jackowski, M.; Bailey, M.

1983-06-01T23:59:59.000Z

285

0711TrustSecrecyReliabilityVotingSystems(Casati) Trust, secrecy and accuracy in voting systems  

E-Print Network [OSTI]

external conditionings and blackmailing, and of preventing the exchange or sale of votes. On the other hand systems (EVS) promise to put an end to the accuracy issue, at least in principle. All steps of the systems

Paris-Sud XI, Université de

286

Renewable and Distributed Systems Integration Peer Review  

Broader source: Energy.gov (indexed) [DOE]

4 4 Denver Marriott West Golden, Colorado AGENDA Tuesday, November 2, 2010 8:00 am Registration and Continental Breakfast 9:00 am-9:10 am Welcome Dr. Robert Hawsey, Associate Laboratory Director for Renewable Electricity and End Use Systems, US DOE-National Renewable Energy Laboratory 9:10 am-9:25 am Overview of Smart Grid Program Eric Lightner, U.S. Department of Energy 9:25 am-9:40 am Overview of Smart Grid Research and Development Activities Dan Ton, U.S. Department of Energy Moderator - Merrill Smith, U.S. Department of Energy 9:40 am-10:10 am University of Hawaii Renewable and Distributed Systems Jay Griffin, University of Hawaii 10:10 am-10:40 am Demonstration of a Coordinated and Integrated System Dennis Sumner, City of Fort Collins

287

A fuzzy expert system for the human reliability analysis of crews in simulated nuclear emergency procedures  

Science Journals Connector (OSTI)

The use of Human Reliability Analysis (HRA) for a particular safety assessment is still a difficult problem. In order to perform a comparison of the available methods, the best approach is simulation. In this regard, the pilot study proposed by the Organisation for Economic Co-operation and Development (OECD) Halden Reactor Project (HRP) is intended to provide a first guidance in HRA methods evaluation through experimental data on crew performance in simulated scenarios. The quantitative evaluation of the results of these simulations in terms of crew performance and Human Error Probabilities (HEPs) is quite a difficult task. In this paper, a fuzzy expert system for systematically assessing crew performance is presented. The feasibility of the method is proved on a case study concerning a scenario of an incomplete scram in a Boiling Water Reactor (BWR).

E. Zio; P. Baraldi; M. Librizzi

2010-01-01T23:59:59.000Z

288

Distributed Sensor Coordination for Advanced Energy Systems  

SciTech Connect (OSTI)

The ability to collect key system level information is critical to the safe, efficient and reli- able operation of advanced energy systems. With recent advances in sensor development, it is now possible to push some level of decision making directly to computationally sophisticated sensors, rather than wait for data to arrive to a massive centralized location before a decision is made. This type of approach relies on networked sensors (called “agents” from here on) to actively collect and process data, and provide key control deci- sions to significantly improve both the quality/relevance of the collected data and the as- sociating decision making. The technological bottlenecks for such sensor networks stem from a lack of mathematics and algorithms to manage the systems, rather than difficulties associated with building and deploying them. Indeed, traditional sensor coordination strategies do not provide adequate solutions for this problem. Passive data collection methods (e.g., large sensor webs) can scale to large systems, but are generally not suited to highly dynamic environments, such as ad- vanced energy systems, where crucial decisions may need to be reached quickly and lo- cally. Approaches based on local decisions on the other hand cannot guarantee that each agent performing its task (maximize an agent objective) will lead to good network wide solution (maximize a network objective) without invoking cumbersome coordination rou- tines. There is currently a lack of algorithms that will enable self-organization and blend the efficiency of local decision making with the system level guarantees of global decision making, particularly when the systems operate in dynamic and stochastic environments. In this work we addressed this critical gap and provided a comprehensive solution to the problem of sensor coordination to ensure the safe, reliable, and robust operation of advanced energy systems. The differentiating aspect of the proposed work is in shift- ing the focus towards “what to observe” rather than “how to observe” in large sensor networks, allowing the agents to actively determine both the structure of the network and the relevance of the information they are seeking to collect. In addition to providing an implicit coordination mechanism, this approach allows the system to be reconfigured in response to changing needs (e.g., sudden external events requiring new responses) or changing sensor network characteristics (e.g., sudden changes to plant condition). Outcome Summary: All milestones associated with this project have been completed. In particular, private sensor objective functions were developed which are aligned with the global objective function, sensor effectiveness has been improved by using “sensor teams,” system efficiency has been improved by 30% using difference evaluation func- tions, we have demonstrated system reconfigurability for 20% changes in system con- ditions, we have demonstrated extreme scalability of our proposed algorithm, we have demonstrated that sensor networks can overcome disruptions of up to 20% in network conditions, and have demonstrated system reconfigurability to 20% changes in system conditions in hardware-based simulations. This final report summarizes how each of these milestones was achieved, and gives insight into future research possibilities past the work which has been completed. The following publications support these milestones [6, 8, 9, 10, 16, 18, 19].

Tumer, Kagan

2013-07-31T23:59:59.000Z

289

Optimal fuzzy multi-objective design of a renewable energy system with economics, reliability, and environmental emissions considerations  

Science Journals Connector (OSTI)

Besides economical issues reliability and environmental emissions have become major concerns whenever an energy system is designed. The objective of this study is to design both an autonomous and non-autonomous hybrid green power system (HGPS) to supply a specific load demand considering economics reliability indices and environmental emissions. The HGPS includes wind turbine (WT) photovoltaic (PV) array fuel cell and the actual data used for simulation which are annual solar irradiation and wind speed for the state of Illinois. For reliability analysis it is assumed that only WT PV DC/AC convertor and electrical network might have failure in supplying power. To evaluate the actual reliability level of the HGPS equipments all possible conditions should be considered and for each one of them the reliability indices are estimated by determining the quantity and probability of load demands not supplied. However in this study an approximate model is utilized to examine the reliability indices. In the approximate model the average power generation of WT units and PV array is utilized (instead of considering the outage of each WT unit and PV array separately) and then the mathematical expectation of reliability indices is calculated. The results show that the reliability indices are activated when there is no backup (electrical network) for the HGPS. The utilization of HGPS in parallel with electrical network when cost is given the highest importance leads to the purchase of all power from the electrical network. However when emission is considered as the second objective function in the fuzzy multi-objective problem; the degree of importance given to each function (total cost and emission) plays a major role in the optimal design of HGPS.

2014-01-01T23:59:59.000Z

290

SOFC combined cycle systems for distributed generation  

SciTech Connect (OSTI)

The final phase of the tubular SOFC development program will focus on the development and demonstration of pressurized solid oxide fuel cell (PSOFC)/gas turbine (GT) combined cycle power systems for distributed power applications. The commercial PSOFC/GT product line will cover the power range 200 kWe to 50 MWe, and the electrical efficiency for these systems will range from 60 to 75% (net AC/LHV CH4), the highest of any known fossil fueled power generation technology. The first demonstration of a pressurized solid oxide fuel cell/gas turbine combined cycle will be a proof-of-concept 250 kWe PSOFC/MTG power system consisting of a single 200 kWe PSOFC module and a 50 kWe microturbine generator (MTG). The second demonstration of this combined cycle will be 1.3 MWe fully packaged, commercial prototype PSOFC/GT power system consisting of two 500 kWe PSOFC modules and a 300 kWe gas turbine.

Brown, R.A.

1997-05-01T23:59:59.000Z

291

Best Management Practice: Distribution System Audits, Leak Detection, and  

Broader source: Energy.gov (indexed) [DOE]

Best Management Practice: Distribution System Audits, Leak Best Management Practice: Distribution System Audits, Leak Detection, and Repair Best Management Practice: Distribution System Audits, Leak Detection, and Repair October 7, 2013 - 3:06pm Addthis A distribution system audit, leak detection, and repair programs help Federal facilities reduce water losses and make better use of limited water resources. Overview Federal facilities with large campus settings and expansive distribution systems can lose a significant amount of total water production and purchases to system leaks. Leaks in distribution systems are caused by a number of factors, including pipe corrosion, high system pressure, construction disturbances, frost damage, damaged joints, and ground shifting and settling. Regular distribution system leak detection surveys

292

Multi-scale Analysis of Large Distributed Computing Systems  

E-Print Network [OSTI]

Multi-scale Analysis of Large Distributed Computing Systems Lucas Mello Schnorr INRIA MESCAL, CNRS-scale distributed systems, Performance visualization analysis, Resource usage anomalies, Volunteer computing, Triva.Vincent@imag.fr ABSTRACT Large scale distributed systems are composed of many thou- sands of computing units. Today

Paris-Sud XI, Université de

293

Reliability Modeling of Cyber-Physical Electric Power Systems: A System-Theoretic Framework  

E-Print Network [OSTI]

generation sources, e.g., wind, photovoltaics (PV), new loads, such as plug-in hybrid electric vehicles (PHEV]. In this regard, next generation electric power systems envisioned under the US DOE Smart Grid initiative and its the tight coupling between this communication and control infrastructure and the physical components

Liberzon, Daniel

294

Carbon and Water Resource Management for Water Distribution Systems  

E-Print Network [OSTI]

the embodied energy in drinking water supply systems: a caselosses to 5% of total drinking water supply for threeResearch Council. Drinking Water Distribution Systems:

Hendrickson, Thomas Peter

2013-01-01T23:59:59.000Z

295

A reliable control system for measurement on film thickness in copper chemical mechanical planarization system  

SciTech Connect (OSTI)

In recent years, a variety of film thickness measurement techniques for copper chemical mechanical planarization (CMP) are subsequently proposed. In this paper, the eddy-current technique is used. In the control system of the CMP tool developed in the State Key Laboratory of Tribology, there are in situ module and off-line module for measurement subsystem. The in situ module can get the thickness of copper film on wafer surface in real time, and accurately judge when the CMP process should stop. This is called end-point detection. The off-line module is used for multi-points measurement after CMP process, in order to know the thickness of remained copper film. The whole control system is structured with two levels, and the physical connection between the upper and the lower is achieved by the industrial Ethernet. The process flow includes calibration and measurement, and there are different algorithms for two modules. In the process of software development, C++ is chosen as the programming language, in combination with Qt OpenSource to design two modules’ GUI and OPC technology to implement the communication between the two levels. In addition, the drawing function is developed relying on Matlab, enriching the software functions of the off-line module. The result shows that the control system is running stably after repeated tests and practical operations for a long time.

Li, Hongkai; Qu, Zilian; Zhao, Qian; Tian, Fangxin; Zhao, Dewen; Meng, Yonggang; Lu, Xinchun [State Key Laboratory of Tribology, Tsinghua University, Beijing 100084 (China)] [State Key Laboratory of Tribology, Tsinghua University, Beijing 100084 (China)

2013-12-15T23:59:59.000Z

296

Cathode power distribution system and method of using the same for power distribution  

DOE Patents [OSTI]

Embodiments include a cathode power distribution system and/or method of using the same for power distribution. The cathode power distribution system includes a plurality of cathode assemblies. Each cathode assembly of the plurality of cathode assemblies includes a plurality of cathode rods. The system also includes a plurality of bus bars configured to distribute current to each of the plurality of cathode assemblies. The plurality of bus bars include a first bus bar configured to distribute the current to first ends of the plurality of cathode assemblies and a second bus bar configured to distribute the current to second ends of the plurality of cathode assemblies.

Williamson, Mark A; Wiedmeyer, Stanley G; Koehl, Eugene R; Bailey, James L; Willit, James L; Barnes, Laurel A; Blaskovitz, Robert J

2014-11-11T23:59:59.000Z

297

Enhancing Lifetime Reliability Of Chip Multiprocessors Through 3D Resource Sharing  

E-Print Network [OSTI]

macroscopic distribution of failures in reliability design.in reliability analysis than the exponential distribution [distributions can be used to provide a methodology for simulating lifetime reliability

Strikos, Nikolaos

298

Probabilistic Approach to Quantifying the Contribution of Variable Generation and Transmission to System Reliability: Preprint  

SciTech Connect (OSTI)

The increasing electrical load served by variable generation (VG), such as wind and solar energy, in the United States and many other countries has stimulated an interesting line of research to better quantify the capacity value of these resources. Methods applied traditionally to thermal units based on their average outage rates do not apply to VG because of their uncertain and non-dispatchable nature. The North American Electric Reliability Corporation's Integration of Variable Generation Task Force recently released a report that highlighted the need to develop and benchmark underlying loss-of-load expectation and related metrics that reasonably and fairly calculate the contribution to planning reserves, or capacity value, of solar and wind power. As the fraction of generation coming from VG becomes more significant, their estimated capacity value will have a larger impact on system planning. In this paper, we provide a method to include VG in traditional probabilistic-based adequacy methods. This method has been implemented in the Renewable Energy Probabilistic Resource Assessment tool developed at the National Renewable Energy Laboratory. Through an example based on the U.S. Western Interconnection, this method is applied to assess the effect that transmission can have on resource adequacy. We also analyze the interactions between available transmission and capacity value for VG.

Ibanez, E.; Milligan, M.

2012-09-01T23:59:59.000Z

299

Systems Analysis Programs for Hands-on Integrated Reliability Evaluations (SAPHIRE) Data Loading Manual  

SciTech Connect (OSTI)

The Systems Analysis Programs for Hands-on Integrated Reliability Evaluations (SAPHIRE) is a software application developed for performing a complete probabilistic risk assessment (PRA) using a personal computer. SAPHIRE is primarily funded by the U.S. Nuclear Regulatory Commission (NRC) and developed by the Idaho National Laboratory. This report is intended to assist the user to enter PRA data into the SAPHIRE program using the built-in MAR-D ASCII-text file data transfer process. Towards this end, a small sample database is constructed and utilized for demonstration. Where applicable, the discussion includes how the data processes for loading the sample database relate to the actual processes used to load a larger PRA models. The procedures described herein were developed for use with SAPHIRE Version 6.0 and Version 7.0. In general, the data transfer procedures for version 6 and 7 are the same, but where deviations exist, the differences are noted. The guidance specified in this document will allow a user to have sufficient knowledge to both understand the data format used by SAPHIRE and to carry out the transfer of data between different PRA projects.

C. L. Smith; K. J. Kvarfordt; S. T. Wood

2006-07-01T23:59:59.000Z

300

Systems Analysis Programs for Hands-on Integrated Reliability Evaluations (SAPHIRE) Data Loading Manual  

SciTech Connect (OSTI)

The Systems Analysis Programs for Hands-on Integrated Reliability Evaluations (SAPHIRE) is a software application developed for performing a complete probabilistic risk assessment (PRA) using a personal computer. SAPHIRE is primarily funded by the U.S. Nuclear Regulatory Commission (NRC) and developed by the Idaho National Laboratory. This report is intended to assist the user to enter PRA data into the SAPHIRE program using the built-in MAR-D ASCII-text file data transfer process. Towards this end, a small sample database is constructed and utilized for demonstration. Where applicable, the discussion includes how the data processes for loading the sample database relate to the actual processes used to load a larger PRA models. The procedures described herein were developed for use with SAPHIRE Version 6.0 and Version 7.0. In general, the data transfer procedures for version 6 and 7 are the same, but where deviations exist, the differences are noted. The guidance specified in this document will allow a user to have sufficient knowledge to both understand the data format used by SAPHIRE and to carry out the transfer of data between different PRA projects.

C. L. Smith; K. J. Kvarfordt; S. T. Wood

2008-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "distribution system reliability" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Property:Distributed Generation System Enclosure | Open Energy Information  

Open Energy Info (EERE)

System Enclosure System Enclosure Jump to: navigation, search This is a property of type String. The allowed values for this property are: Indoor Outdoor Dedicated Shelter Pages using the property "Distributed Generation System Enclosure" Showing 22 pages using this property. D Distributed Generation Study/10 West 66th Street Corp + Indoor + Distributed Generation Study/615 kW Waukesha Packaged System + Outdoor + Distributed Generation Study/Aisin Seiki G60 at Hooligans Bar and Grille + Outdoor + Distributed Generation Study/Arrow Linen + Outdoor + Distributed Generation Study/Dakota Station (Minnegasco) + Outdoor + Distributed Generation Study/Elgin Community College + Indoor + Distributed Generation Study/Emerling Farm + Dedicated Shelter + Distributed Generation Study/Floyd Bennett + Outdoor +

302

Waste Feed Delivery System Phase 1 Preliminary Reliability and Availability and Maintainability Analysis [SEC 1 and 2  

SciTech Connect (OSTI)

The document presents updated results of the preliminary reliability, availability, maintainability analysis performed for delivery of waste feed from tanks 241-AZ-101 and 241-AN-105 to British Nuclear Fuels Limited, inc. under the Tank Waste Remediation System Privatization Contract. The operational schedule delay risk is estimated and contributing factors are discussed.

CARLSON, A.B.

1999-11-11T23:59:59.000Z

303

Cost Modeling and Design Techniques for Integrated Package Distribution Systems  

E-Print Network [OSTI]

Cost Modeling and Design Techniques for Integrated Package Distribution Systems Karen R. Smilowitz and Carlos F. Daganzo December 23, 2005 Abstract Complex package distribution systems are designed using-scale integrated distribution networks. While the network design problem is quite complex, we demonstrate

Smilowitz, Karen

304

Estimation of the reliability of space nuclear power systems by probabilistic risk assessment techniques  

E-Print Network [OSTI]

Thermionic Reactor (SEHPTR). The present analysis focuses on the SNPS failure to produce nominal electrical power. Typical events threatening the reliability of the SNPS will consist of hardware failures, external events, and command errors or software...

Gutner, Sophie Isabelle

2012-06-07T23:59:59.000Z

305

Reliability study of a special decay heat removal system of a gas-cooled fast reactor demonstrator  

Science Journals Connector (OSTI)

Abstract The European roadmap toward the development of generation IV concepts addresses the safety and reliability assessment of the special system designed for decay heat removal of a gas-cooled fast reactor demonstrator (GFRD). The envisaged system includes the combination of both active and passive means to accomplish the fundamental safety function. Failure probabilities are calculated on various system configurations, according to either pressurized or depressurized accident events under investigation, and integrated with probabilities of occurrence of corresponding hardware components and natural circulation performance assessment. The analysis suggests the improvement of measures against common cause failures (CCF), in terms of an appropriate diversification among the redundant systems, to reduce the system failure risk. Particular emphasis is placed upon passive system reliability assessment, being recognized to be still an open issue, and the approach based on the functional reliability is adopted to address the point. Results highlight natural circulation as a challenging factor for the decay heat removal safety function accomplishment by means of passive devices. With the models presented here, the simplifying assumptions and the limited scenarios considered according to the level of definition of the design, where many systems are not yet established, one can conclude that attention has to be paid to the functional aspects of the passive system, i.e. the ones not pertaining to the “hardware” of the system. In this article the results of the analysis are discussed, where the effects of the analytical assumptions, design options, accident managements on the reliability are examined. The design diversity of the components undergoing \\{CCFs\\} can be effective for the improvement and some accident management measures are also possible by making use of the long grace period in GFRD.

Luciano Burgazzi

2014-01-01T23:59:59.000Z

306

Power electronics reliability analysis.  

SciTech Connect (OSTI)

This report provides the DOE and industry with a general process for analyzing power electronics reliability. The analysis can help with understanding the main causes of failures, downtime, and cost and how to reduce them. One approach is to collect field maintenance data and use it directly to calculate reliability metrics related to each cause. Another approach is to model the functional structure of the equipment using a fault tree to derive system reliability from component reliability. Analysis of a fictitious device demonstrates the latter process. Optimization can use the resulting baseline model to decide how to improve reliability and/or lower costs. It is recommended that both electric utilities and equipment manufacturers make provisions to collect and share data in order to lay the groundwork for improving reliability into the future. Reliability analysis helps guide reliability improvements in hardware and software technology including condition monitoring and prognostics and health management.

Smith, Mark A.; Atcitty, Stanley

2009-12-01T23:59:59.000Z

307

Property:Distributed Generation System Application | Open Energy  

Open Energy Info (EERE)

System Application System Application Jump to: navigation, search This is a property of type Page. Pages using the property "Distributed Generation System Application" Showing 22 pages using this property. D Distributed Generation Study/10 West 66th Street Corp + Combined Heat and Power + Distributed Generation Study/615 kW Waukesha Packaged System + Combined Heat and Power + Distributed Generation Study/Aisin Seiki G60 at Hooligans Bar and Grille + Combined Heat and Power + Distributed Generation Study/Arrow Linen + Combined Heat and Power + Distributed Generation Study/Dakota Station (Minnegasco) + Combined Heat and Power + Distributed Generation Study/Elgin Community College + Combined Heat and Power + Distributed Generation Study/Emerling Farm + Combined Heat and Power +

308

Multi-objective planning of electrical distribution systems using dynamic programming  

Science Journals Connector (OSTI)

This paper presents a novel dynamic programming approach for multi-objective planning of electrical distribution systems. In this planning, the optimal feeder routes and branch conductor sizes of a distribution system are determined by simultaneous optimization of cost and reliability. The multiple planning objectives are minimization of: (i) installation and operational cost, and (ii) interruption cost. The first objective function consists of the installation cost of new feeder branches and substations, maintenance cost of the existing and new feeder branches, and the cost of energy losses. The second objective function measures the reliability of the distribution network in terms of the associated interruption costs for all the branches, which includes the cost of non-delivered energy, cost of repair, and the customer damage cost due to interruptions. A dynamic programming based planning algorithm for optimization of the feeder routes and branch conductor sizes is proposed. A set of Pareto solutions is obtained using a weighted aggregation of the two objectives with different weight settings. The proposed approach is evaluated on 21-, 54-, and 100-node distribution systems. The simulation test results are analyzed with various case studies and are compared with those of two existing planning approaches based on multi-objective evolutionary algorithm.

S. Ganguly; N.C. Sahoo; D. Das

2013-01-01T23:59:59.000Z

309

GridLab Power Distribution System Simulation | Open Energy Information  

Open Energy Info (EERE)

GridLab Power Distribution System Simulation GridLab Power Distribution System Simulation Jump to: navigation, search Tool Summary Name: GridLab Power Distribution System Simulation Agency/Company /Organization: Pacific Northwest National Laboratory Sector: Energy Focus Area: Grid Assessment and Integration Phase: Evaluate Options Topics: Pathways analysis User Interface: Desktop Application Website: www.gridlabd.org/ Cost: Free OpenEI Keyword(s): EERE tool Language: English References: GridLAB-D Simulation Software[1] Examine in detail the interplay of every part of a distribution system with every other part of the system. GridLAB-D(tm) is a new power distribution system simulation and analysis tool that provides valuable information to users who design and operate distribution systems, and to utilities that wish to take advantage of the

310

NREL: Energy Systems Integration Facility - Thermal Distribution...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

thermal distribution bus consists of a thermal water loop connected to a research boiler and chiller that provide precise and efficient control of the water temperature...

311

Research on Energy Efficiency of DC Distribution System  

Science Journals Connector (OSTI)

Abstract Energy efficiency of DC distribution systems is researched in this paper. Efficiency calculation models of feeders and loads are established, efficiencies of AC/DC, DC/DC and DC/AC are analyzed. Moreover, energy efficiencies of an AC system and two DC systems, monopole and bipolar, are calculated and compared. The efficiency improvement of office building supplied by DC power system compared to supply by AC power system is demonstrated. From analysis, it is showed that the energy efficiency is higher in DC distribution system than AC distribution system.

Zifa Liu; Mengyu Li

2014-01-01T23:59:59.000Z

312

Multiobjective optimal placement of switches and protective devices in electric power distribution systems using ant colony optimization  

Science Journals Connector (OSTI)

This paper presents a multiobjective optimization methodology to optimally place switches and protective devices in electric power distribution networks. Identifying the type and location of them is a combinatorial optimization problem described by a nonlinear and nondifferential function. The multiobjective ant colony optimization (MACO) has been applied to this problem to minimize the total cost while simultaneously minimize two distribution network reliability indices including system average interruption frequency index (SAIFI) and system interruption duration index (SAIDI). Actual distribution feeders are used in the tests, and test results have shown that the algorithm can determine the set of optimal nondominated solutions. It allows the utility to obtain the optimal type and location of devices to achieve the best system reliability with the lowest cost.

Wiwat Tippachon; Dulpichet Rerkpreedapong

2009-01-01T23:59:59.000Z

313

Quality Modeling of Water Distribution Systems using Sensitivity Equations  

E-Print Network [OSTI]

Quality Modeling of Water Distribution Systems using Sensitivity Equations P. Fabrie1 ; G. Gancel2 and the associated sensitivity equa- tions are solved for Water Distribution Systems (WDS). A new solution algorithm presented in this study permits global sensitivity analysis of the system to be performed and its efficiency

Boyer, Edmond

314

Managing Uncertainty in Operational Control of Water Distribution Systems  

E-Print Network [OSTI]

Managing Uncertainty in Operational Control of Water Distribution Systems A. Bargiela Department. There are system management decisions concerning the regulatory measures such as water pricing principles, effluent in water distribution systems con- cern reservoir(s) management with associated pump scheduling

Bargiela, Andrzej

315

Distributed dynamic load balancing for pipelined computations on heterogeneous systems  

Science Journals Connector (OSTI)

One of the most significant causes for performance degradation of scientific and engineering applications on high performance computing systems is the uneven distribution of the computational work to the resources of the system. This effect, which is ... Keywords: Distributed model, Dynamic load balancing algorithms, Loops with dependencies, Master-worker model, Non-dedicated heterogeneous systems, Synchronization, Weighting

Ioannis Riakiotakis; Florina M. Ciorba; Theodore Andronikos; George Papakonstantinou

2011-10-01T23:59:59.000Z

316

Laboratories for the 21st Century: Best Practices (Brochure): Onsite Distributed Generation Systems For Laboratories  

Broader source: Energy.gov (indexed) [DOE]

L L a b o r a t o r i e s f o r t h e 2 1 s t C e n t u r y : B e s t P r a c t i c e s This combined heat and power system at the Bristol-Myers Squibb laboratory in Wallingford, Connecticut, could meet 100% of the lab's power requirement, if necessary. Bernard Blesinger / PIX 12552 ONSITE DISTRIBUTED GENERATION SYSTEMS FOR LABORATORIES Introduction Laboratories have unique requirements for lighting, ventilation, and scientific equipment with each requiring a considerable amount of energy. The reliability of that energy is very important. Laboratories must be able to conduct research without power interruptions, which can damage both equipment and experiments. Generating power and heat on site is one good way to enhance energy reliability, improve fuel utilization efficiency, reduce utility costs,

317

Engineering Incentives in Distributed Systems with Healthcare Applications  

E-Print Network [OSTI]

ENGINEERING INCENTIVES IN DISTRIBUTED SYSTEMS WITH HEALTHCARE APPLICATIONS A Dissertation by BRANDON REED POPE Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree... of DOCTOR OF PHILOSOPHY August 2011 Major Subject: Industrial Engineering Engineering Incentives in Distributed Systems with Healthcare Applications Copyright 2011 Brandon Reed Pope ENGINEERING INCENTIVES IN DISTRIBUTED SYSTEMS WITH HEALTHCARE...

Pope, Brandon 1984-

2011-07-15T23:59:59.000Z

318

Automatic diagnosis and control of distributed solid state lighting systems  

Science Journals Connector (OSTI)

This paper describes a new design concept of automatically diagnosing and compensating LED degradations in distributed solid state lighting (SSL) systems. A failed LED may...

Dong, Jianfei; van Driel, Willem; Zhang, Guoqi

2011-01-01T23:59:59.000Z

319

An integrated optimal design method for utility power distribution systems.  

E-Print Network [OSTI]

??This dissertation presents a comprehensive and integrated design methodology to optimize both the electrical and the economic performance of a utility power distribution system. The… (more)

Fehr, Ralph E

2005-01-01T23:59:59.000Z

320

Sensor Networks for Monitoring and Control of Water Distribution Systems  

E-Print Network [OSTI]

Water distribution systems present a significant challenge for structural monitoring. They comprise a complex network of pipelines buried underground that are relatively inaccessible. Maintaining the integrity of these ...

Whittle, Andrew

Note: This page contains sample records for the topic "distribution system reliability" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Economic Operation and Planning of Distribution System Sources.  

E-Print Network [OSTI]

??This thesis presents the findings of some research carried out pertaining to economic operation and planning distribution systems. An optimal capacitor switching algorithm is developed… (more)

Li, KaiYu

2010-01-01T23:59:59.000Z

322

Design optimization of a fuzzy distributed generation (DG) system with multiple renewable energy sources  

Science Journals Connector (OSTI)

The global rise in energy demands brings major obstacles to many energy organizations in providing adequate energy supply. Hence many techniques to generate cost effective reliable and environmentally friendly alternative energy source are being explored. One such method is the integration of photovoltaic cells wind turbine generators and fuel-based generators included with storage batteries. This sort of power systems are known as distributed generation (DG) power system. However the application of DG power systems raise certain issues such as cost effectiveness environmental impact and reliability. The modelling as well as the optimization of this DG power system was successfully performed in the previous work using Particle Swarm Optimization (PSO). The central idea of that work was to minimize cost minimize emissions and maximize reliability (multi-objective (MO) setting) with respect to the power balance and design requirements. In this work we introduce a fuzzy model that takes into account the uncertain nature of certain variables in the DG system which are dependent on the weather conditions (such as; the insolation and wind speed profiles). The MO optimization in a fuzzy environment was performed by applying the Hopfield Recurrent Neural Network (HNN). Analysis on the optimized results was then carried out.

2012-01-01T23:59:59.000Z

323

Property:Distributed Generation System Power Application | Open Energy  

Open Energy Info (EERE)

Application Application Jump to: navigation, search This is a property of type Page. Pages using the property "Distributed Generation System Power Application" Showing 21 pages using this property. D Distributed Generation Study/10 West 66th Street Corp + Based Load + Distributed Generation Study/Aisin Seiki G60 at Hooligans Bar and Grille + Based Load + Distributed Generation Study/Arrow Linen + Based Load + Distributed Generation Study/Dakota Station (Minnegasco) + Based Load +, Backup + Distributed Generation Study/Elgin Community College + Based Load +, Backup + Distributed Generation Study/Emerling Farm + Based Load + Distributed Generation Study/Floyd Bennett + Based Load + Distributed Generation Study/Harbec Plastics + Based Load + Distributed Generation Study/Hudson Valley Community College + Based Load +

324

Systems Analysis Programs for Hands-on Intergrated Reliability Evaluations (SAPHIRE) Summary Manual  

SciTech Connect (OSTI)

The Systems Analysis Programs for Hands-on Integrated Reliability Evaluations (SAPHIRE) is a software application developed for performing a complete probabilistic risk assessment (PRA) using a personal computer (PC) running the Microsoft Windows operating system. SAPHIRE is primarily funded by the U.S. Nuclear Regulatory Commission (NRC) and developed by the Idaho National Laboratory (INL). INL's primary role in this project is that of software developer and tester. However, INL also plays an important role in technology transfer by interfacing and supporting SAPHIRE users, who constitute a wide range of PRA practitioners from the NRC, national laboratories, the private sector, and foreign countries. SAPHIRE can be used to model a complex system’s response to initiating events and quantify associated consequential outcome frequencies. Specifically, for nuclear power plant applications, SAPHIRE can identify important contributors to core damage (Level 1 PRA) and containment failure during a severe accident which lead to releases (Level 2 PRA). It can be used for a PRA where the reactor is at full power, low power, or at shutdown conditions. Furthermore, it can be used to analyze both internal and external initiating events and has special features for transforming an internal events model to a model for external events, such as flooding and fire analysis. It can also be used in a limited manner to quantify risk in terms of release consequences to the public and environment (Level 3 PRA). SAPHIRE also includes a separate module called the Graphical Evaluation Module (GEM). GEM is a special user interface linked to SAPHIRE that automates the SAPHIRE process steps for evaluating operational events at commercial nuclear power plants. Using GEM, an analyst can estimate the risk associated with operational events (for example, to calculate a conditional core damage probability) very efficiently and expeditiously. This report provides an overview of the functions available in SAPHIRE and presents general instructions for using the software. Section 1 presents SAPHIRE’s historical evolution and summarizes its capabilities. Section 2 presents instructions for installing and using the code. Section 3 explains the database structure used in SAPHIRE and discusses database concepts. Section 4 explains how PRA data (event frequencies, human error probabilities, etc.) can be generated and manipulated using “change sets.” Section 5 deals with fault tree operations, including constructing, editing, solving, and displaying results. Section 6 presents operations associated with event trees, including rule application for event tree linking, partitioning, and editing sequences. Section 7 presents how accident sequences are generated, solved, quantified, and analyzed. Section 8 discusses the functions available for performing end state analysis. Section 9 explains how to modify data stored in a SAPHIRE database. Section 10 illustrates how to generate and customize reports. Section 11 covers SAPHIRE utility options to perform routine functions such as defining constant values, recovering databases, and loading data from external sources. Section 12 provides an overview of GEM’s features and capabilities. Finally, Section 13 summarizes SAPHIRE’s quality assurance process.

C. L. Smith

2008-08-01T23:59:59.000Z

325

NiSource Energy Technologies Inc.: System Integration of Distributed Power for Complete Building Systems  

SciTech Connect (OSTI)

Summarizes NiSource Energy Technologies' work under contract to DOE's Distribution and Interconnection R&D. Includes studying distributed generation interconnection issues and CHP system performance.

Not Available

2003-10-01T23:59:59.000Z

326

Approximately optimum confidence bounds on series system reliability for exponential time to failure data  

Science Journals Connector (OSTI)

......exponential time to failure data NANCY R. MANN FRANK E. GRUBBS Rocketdyne, North American Rockwell Corporation U.S. Army Aberdeen...reliability for exponential time to failure data BY NANCY R. MANN Rocketdyne, North American Rockwell Corporation AND FRANK E. GRUBBS......

NANCY R. MANN; FRANK E. GRUBBS

1972-04-01T23:59:59.000Z

327

Reliability test of a RIFD system for tool management on construction sites  

E-Print Network [OSTI]

technology and tests are conducted to understand the influence of these factors on the readability of the RFID tags. Number of tools and the velocity with which tools are taken across the portal are two variables that are tested for reliability of RFID. Tests...

Kalla, Naresh

2009-05-15T23:59:59.000Z

328

Optimal allocation of reliability tasks to mitigate faults during system development  

Science Journals Connector (OSTI)

......fault tree analysis (FTA), failure mode and effects analysis (FMEA) and highly accelerated life testing (see O'Connor, 2000...since, e.g. the concern elicitation provides a rough-cut FMEA which provides the inputs to the reliability-centred maintenance......

W. Johnston; J. Quigley; L. Walls

2006-04-01T23:59:59.000Z

329

Incorporating reliability analysis into the design of passive cooling systems with an application to a gas-cooled reactor  

Science Journals Connector (OSTI)

A time-dependent reliability evaluation of a two-loop passive decay heat removal (DHR) system was performed as part of the iterative design process for a helium-cooled fast reactor. The system was modeled using RELAP5-3D. The uncertainties in input parameters were assessed and were propagated through the model using Latin hypercube sampling. An important finding was the discovery that the smaller pressure loss through the DHR heat exchanger than through the core would make the flow to bypass the core through one DHR loop, if two loops operated in parallel. This finding is a warning against modeling only one lumped DHR loop and assuming that n of them will remove n times the decay power. Sensitivity analyses revealed that there are values of some input parameters for which failures are very unlikely. The calculated conditional (i.e., given the LOCA) failure probability was deemed to be too high leading to the identification of several design changes to improve system reliability. This study is an example of the kinds of insights that can be obtained by including a reliability assessment in the design process. It is different from the usual use of PSA in design, which compares different system configurations, because it focuses on the thermal–hydraulic performance of a safety function.

Francisco J. Mackay; George E. Apostolakis; Pavel Hejzlar

2008-01-01T23:59:59.000Z

330

Century Electric Distribution System Operations Lorenzo Kristov,1  

E-Print Network [OSTI]

May 2014 1 21st Century Electric Distribution System Operations Lorenzo Kristov,1 California adoption of distribution energy technologies. All of this has occurred during a period of increasing of Renewable and Distributed Energy Resources, Caltech Resnick Institute, 2012 #12;May 2014 2 and wholesale

Low, Steven H.

331

State Control Design for Linear Systems with Distributed Time Delays  

E-Print Network [OSTI]

State Control Design for Linear Systems with Distributed Time Delays Daniel Gontkovic and RĂłbert with distributed time delays. Using an extended form of the Lyapunov- Krasovskii functional the controller design involving distributed time delays is a problem of large practical interest where intensive activity are done

Paris-Sud XI, Université de

332

Designing Directories in Distributed Systems: A Systematic Framework  

E-Print Network [OSTI]

Designing Directories in Distributed Systems: A Systematic Framework K. Mani Chandy and Eve M of directory­based distributed applications. We evaluate a space of directory designs using our frame­ work. We distributed applications, including directory design. We propose a weaker con­ cept: estimation. We define

333

How Reliable are Parallel Disk Systems When Energy-Saving Schemes are Involved? Shu Yin, Xiaojun Ruan, Adam Manzanares, and Xiao Qin  

E-Print Network [OSTI]

How Reliable are Parallel Disk Systems When Energy-Saving Schemes are Involved? Shu Yin, Xiaojun, growing evidence shows that energy-saving schemes in disk drives usually have negative impacts on storage - called MINT - to evaluate the reliability of a parallel disk system where energy-saving mechanisms

Qin, Xiao

334

Considering Risk-Taking Behavior in Travel Time Reliability  

E-Print Network [OSTI]

wide distribution of preferences for speed and reliability.Distribution of Motorists’ Preference for Travel Time and Reliability:time, reliability and cost have normal distributions, i.e. ,

2005-01-01T23:59:59.000Z

335

Numerical Analysis of a Cold Air Distribution System  

E-Print Network [OSTI]

Cold air distribution systems may reduce the operating energy consumption of air-conditioned air supply system and improve the outside air volume percentages and indoor air quality. However, indoor temperature patterns and velocity field are easily...

Zhu, L.; Li, R.; Yuan, D.

2006-01-01T23:59:59.000Z

336

MSc Distributed Computing Systems Engineering Department of Electronic & Computer  

E-Print Network [OSTI]

Computing Systems Engineering Department of Electronic & Computer Engineering Brunel University Audio ServerMSc Distributed Computing Systems Engineering Department of Electronic & Computer Engineering Brunel University Audio Server for Virtual Reality Applications Marc Schreier May 2002 A dissertation

Schulze, JĂĽrgen P.

337

Increasing the Reliability of Reliability Jochen Brocker1,  

E-Print Network [OSTI]

Increasing the Reliability of Reliability Diagrams Jochen Br¨ocker1, and Leonard A. Smith1,2 1 University Oxford, UK Corresponding Author, cats@lse.ac.uk November 9, 2006 #12;Abstract The reliability; for the most part, ambiguities arise from variation in the distribution of forecast probabilities and from

Stevenson, Paul

338

A Distributed Facilities Automation System For IBM Buildings  

E-Print Network [OSTI]

protocol. This will allow the facility manager to take advantage of the expertise of ~any control system suppliers while retaining central control, override authority, and specialized manage ment functions. A distributed facilities automation system... protocol. This will allow the facility manager to take advantage of the expertise of ~any control system suppliers while retaining central control, override authority, and specialized manage ment functions. A distributed facilities automation system...

Houle, W. D. Sr.

339

Coping with dependent failures in distributed systems  

E-Print Network [OSTI]

election, as well as practical applications, such as replication in multi-site systems and cooperative

Junqueira, Flavio

2006-01-01T23:59:59.000Z

340

A Task Context Aware Physical Distribution Knowledge Service System  

Science Journals Connector (OSTI)

A physical distribution task has typical characteristics of dynamic mobility: dynamic locations, time criticality, and environmental complexity. Research has focused on creating an environmental and task adaptive knowledge service system to support collaborative ... Keywords: Collaborative Physical Distribution, Context Awareness, Knowledge Services, Service Systems, Task Context

Liang Xiao, Yanli Pei

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "distribution system reliability" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Local dynamic update for component-based distributed systems  

Science Journals Connector (OSTI)

Dynamic evolution is a key aspect of the design, development, and maintenance of complex and distributed software systems built by integrating components. Evolution, traditionally obtained by producing software upgrades, may derive from changes in the ... Keywords: component-based distributed system, dynamic reconfiguration, dynamic software update, software evolution

Valerio Panzica La Manna

2012-06-01T23:59:59.000Z

342

Dynamic software update for component-based distributed systems  

Science Journals Connector (OSTI)

Dynamic evolution is a key aspect of the design, development, and maintenance of complex and distributed software systems built by integrating components. Evolution, tradi- tionally obtained by producing software upgrades, may de- rive from changes in ... Keywords: component-based distributed system, dynamic reconfiguration, dynamic software update, software evolution

Valerio Panzica La Manna

2011-06-01T23:59:59.000Z

343

STOCHASTIC CONTROL FOR DISTRIBUTED SYSTEMS WITH APPLICATIONS TO WIRELESS  

E-Print Network [OSTI]

STOCHASTIC CONTROL FOR DISTRIBUTED SYSTEMS WITH APPLICATIONS TO WIRELESS COMMUNICATIONS Minyi Huang Departement of Electrical and Computer Engineering McGill University, Montr´eal June 2003 A Thesis submitted and optimization of distributed stochastic systems motivated by current wireless applications. In wireless

Huang, Minyi

344

Quasi-parallel network applications in real-time distribution management system  

Science Journals Connector (OSTI)

In modern distribution management systems (DMSs), the real-time calculation of the network's state plays an important role for the operation of the network. High sophisticated algorithms for the estimation and calculation of the system's state like distribution system state estimation (DSSE), distribution system power and short circuit calculations (DSPF and SCC), voltage var control (VVC) and others must operate in a real-time environment, supplying subsequently running functions with reliable input data. Closed-loop requirements also increase the requirements concerning performance, availability and robustness. In this paper, an implementation of the sequence control of different DMS-network applications is presented. This proposed real-time scheduler takes advantage of CPU-cores inside of a modern computer system: by passing subtasks to different CPU-cores, the overall performance is significantly increased. The scheduling process is analysed in detail taking the nature of a distribution system into consideration. The presentation is finalised with a report about the gain of performance for the state estimation process.

Izudin Dzafic; Hans-Theo Neisius

2012-01-01T23:59:59.000Z

345

The Comandos Toolset for Distributed Systems Management  

Science Journals Connector (OSTI)

......Hoffner, Y. (1992) Management in Object-Based Federated...1988) Construction and management of distributed office...MEITNER AND F. REIM approach. In Proc. Int. Workshop...die Gestaltung und das Management verteilter Informationssysteme...374-378, Elsevier Science Publishers, Amsterdam......

Gerrit Kerber; Helmut Meitner; Friedemann Reim

1994-01-01T23:59:59.000Z

346

An analysis of distributed solar fuel systems  

E-Print Network [OSTI]

While solar fuel systems offer tremendous potential to address global clean energy needs, most existing analyses have focused on the feasibility of large centralized systems and applications. Not much research exists on ...

Thomas, Alex, S.M. Massachusetts Institute of Technology

2012-01-01T23:59:59.000Z

347

Safety of Gas Transmission and Distribution Systems (Maine) | Department of  

Broader source: Energy.gov (indexed) [DOE]

Safety of Gas Transmission and Distribution Systems (Maine) Safety of Gas Transmission and Distribution Systems (Maine) Safety of Gas Transmission and Distribution Systems (Maine) < Back Eligibility Agricultural Commercial Construction Fed. Government Fuel Distributor General Public/Consumer Industrial Installer/Contractor Institutional Investor-Owned Utility Local Government Low-Income Residential Multi-Family Residential Municipal/Public Utility Nonprofit Residential Retail Supplier Rural Electric Cooperative Schools State/Provincial Govt Systems Integrator Transportation Tribal Government Utility Program Info State Maine Program Type Safety and Operational Guidelines Provider Public Utilities Commission These regulations describe requirements for the participation of natural gas utilities in the Underground Utility Damage Prevention Program,

348

Minimizing Energy Consumption in a Water Distribution System: A Systems Modeling Approach  

E-Print Network [OSTI]

In a water distribution system from groundwater supply, the bulk of energy consumption is expended at pump stations. These pumps pressurize the water and transport it from the aquifer to the distribution system and to elevated storage tanks. Each...

Johnston, John

2011-08-08T23:59:59.000Z

349

Distribution Effectiveness and Impacts on Equipment Sizing for Residential Thermal Distribution Systems  

E-Print Network [OSTI]

1 LBNL-43724 Distribution Effectiveness and Impacts on Equipment Sizing for Residential Thermal Distribution Systems Walker, I., Sherman, M., and Siegel, J. Environmental Energy Technologies Division Energy .................................................................................................................. 14 Figure 1. Simulations of Pulldowns from 3:00 p.m. on a Sacramento Design Day

350

Performance Enhancement of Radial Distributed System with Distributed Generators by Reconfiguration Using Binary Firefly Algorithm  

Science Journals Connector (OSTI)

The extent of real power loss and voltage deviation associated with overloaded feeders in radial distribution system can be reduced by reconfiguration. Reconfiguration is normally achieved by changing the open/cl...

N. Rajalakshmi; D. Padma Subramanian…

2014-08-01T23:59:59.000Z

351

General Order Ensuring Reliable Electric Service (Louisiana) | Department  

Broader source: Energy.gov (indexed) [DOE]

General Order Ensuring Reliable Electric Service (Louisiana) General Order Ensuring Reliable Electric Service (Louisiana) General Order Ensuring Reliable Electric Service (Louisiana) < Back Eligibility Investor-Owned Utility Municipal/Public Utility Utility Savings Category Alternative Fuel Vehicles Hydrogen & Fuel Cells Buying & Making Electricity Water Home Weatherization Solar Wind Program Info State Louisiana Program Type Safety and Operational Guidelines Provider Louisiana Public Service Commission The standards set forth herein have been developed to provide consumers, the Louisiana Public Service Commission, and jurisdictional electric utilities with a uniform method of ensuring reliable electric service. The standards shall be applicable to the distribution systems of all electric utilities under the jurisdiction of the Louisiana Public Service

352

Property:Distributed Generation System Heating-Cooling Application | Open  

Open Energy Info (EERE)

Heating-Cooling Application Heating-Cooling Application Jump to: navigation, search This is a property of type Page. Pages using the property "Distributed Generation System Heating-Cooling Application" Showing 21 pages using this property. D Distributed Generation Study/10 West 66th Street Corp + Domestic Hot Water +, Space Heat and/or Cooling + Distributed Generation Study/Aisin Seiki G60 at Hooligans Bar and Grille + Domestic Hot Water + Distributed Generation Study/Arrow Linen + Domestic Hot Water + Distributed Generation Study/Dakota Station (Minnegasco) + Space Heat and/or Cooling +, Other + Distributed Generation Study/Elgin Community College + Space Heat and/or Cooling +, Domestic Hot Water + Distributed Generation Study/Emerling Farm + Domestic Hot Water +, Process Heat and/or Cooling +

353

The Case for Distributed Decision Making Systems  

Science Journals Connector (OSTI)

......Manager team three Foreman plumber Foreman electrician 1 Project 1 Projea Figure 1. Divisional...Director. The actual labour used (electricians, plumbers, etc.) is, however...A. C. D. Smith, APL--A Design Handbook for Commercial Systems. Wiley, Chichester......

R. C. Thomas; A. Burns

1982-02-01T23:59:59.000Z

354

Automated Fault Location In Smart Distribution Systems  

E-Print Network [OSTI]

measured at the power substation during a single phase to ground fault clearance [17] .............................................. 111 Figure 26 Analyzed signal using wavelet transform from phase B current during a fault [17..., but are not limited to, substation and feeder relay, intelligent controllers for capacitor bank switches or reclosers, Automatic Meter Reading (AMR) systems installed at the customer sites, power quality meters installed at strategic locations in the system, low...

Lotfifard, Saeed

2012-10-19T23:59:59.000Z

355

Summary Results of Electricity Distribution System Challenges and Opportunities  

Broader source: Energy.gov (indexed) [DOE]

6, 2012 6, 2012 Summary Results of Electricity Distribution System Challenges & Opportunities From Breakout Group Sessions Red Team Results Top Challenges * Communication * System Awareness & Modeling * Standards and Interoperability * Need a national scale Grid Operating System (Grid OS) including microgrids - a uniform framework towards operating all of the nation's distribution grids using a collaborative approach - DOE needs to develop an advanced SCADA system definition given to system operators * Bring information together from various sources - differing protocols, lack of a data service bus, automated processes * Lack of a standard communication protocols, data formats/interfaces

356

A distributed data storage and processing framework for next-generation residential distribution systems  

Science Journals Connector (OSTI)

Abstract As the number of smart meters/sensors increases to more than hundreds of thousands, it is rather intuitive that the state-of-the-art centralized information processing architecture will no longer be sustainable under such a big data explosion. Hence, an innovative data management system is urgently needed to facilitate the real-world deployment of a future residential distribution system. In this paper, we investigate a radically different approach through distributed software agents to translate the legacy centralized data storage and processing scheme to a completely distributed cyber-physical architecture. We further substantiate the proposed distributed data storage and processing framework on a proof-of-concept testbed using a cluster of low-cost and credit-card-sized single-board computers. Finally, we evaluate the proposed distributed framework and proof-of-concept testbed with a comprehensive set of performance measures.

Ni Zhang; Yu Yan; Shengyao Xu; Wencong Su

2014-01-01T23:59:59.000Z

357

Appears in Dependable Systems and Networks (DSN), July 2001 We propose a fault-tolerant approach to reliable micropro-  

E-Print Network [OSTI]

that manufactured parts work reliably in varied (and occasionally adverse) operating conditions. If successful

Austin, Todd M.

358

Cost Modeling and Design Techniques for Integrated Package Distribution Systems  

E-Print Network [OSTI]

Cost Modeling and Design Techniques for Integrated Package Distribution Systems Karen R. Smilowitz idealizations of network geometries, operating costs, demand and customer distributions, and routing patterns that approximate the total cost of operation. The design problem is then reduced to a series of optimization

Daganzo, Carlos F.

359

Collaborative Creativity: A Complex Systems Model with Distributed Affect  

E-Print Network [OSTI]

Collaborative Creativity: A Complex Systems Model with Distributed Affect Cecilia R. Aragon E16 2RD UK alisonwilliams62@googlemail.com ABSTRACT The study of creativity has received significant attention over the past century, with a recent increase in interest in collaborative, distributed creativity

Anderson, Richard

360

A Smart Energy System: Distributed Resource Management, Control and Optimization  

E-Print Network [OSTI]

A Smart Energy System: Distributed Resource Management, Control and Optimization Yong Ding, Student of distributed energy resource and consumption management, which proposes to design a networked and embedded platform for realizing a dynamic energy mix and optimizing the energy consumption dy- namically. Based

Beigl, Michael

Note: This page contains sample records for the topic "distribution system reliability" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Enertech 2-kW high-reliability wind system. Phase II. Fabrication and testing  

SciTech Connect (OSTI)

A high-reliability wind machine rated for 2 kW in a 9 m/s wind has been developed. Activities are summarized that are centered on the fabrication and testing of prototypes of the wind machine. The test results verified that the wind machine met the power output specification and that the variable-pitch rotor effectively controlled the rotor speed for wind speeds up to 50 mph. Three prototypes of the wind machine were shipped to the Rocky Flats test center in September through November of 1979. Work was also performed to reduce the start-up wind speed. The start-up wind speed to the Enertech facility has been reduced to 4.5 m/s.

Cordes, J A; Johnson, B A

1981-06-01T23:59:59.000Z

362

Next-Generation Distributed Power Management for Photovoltaic Systems  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Next-Generation Distributed Power Management for Photovoltaic Systems Next-Generation Distributed Power Management for Photovoltaic Systems Speaker(s): Jason Stauth Date: July 29, 2011 - 12:00pm Location: 90-3122 Seminar Host/Point of Contact: Steven Lanzisera In recent years, the balance of systems (BOS) side of photovoltaic (PV) energy has become a major focus in the effort to drive solar energy towards grid parity. The power management architecture has expanded to include a range of distributed solutions, including microinverters and 'micro' DC-DC converters to solve problems with mismatch (shading), expand networking and control, and solve critical BOS issues such as fire safety. This talk will introduce traditional and distributed approaches for PV systems, and will propose a next-generation architecture based on a new

363

Modeling the Effect of Hurricanes on Power Distribution Systems  

E-Print Network [OSTI]

There are many calamitous events such as earthquakes, hurricanes, tsunamis etc. that occur suddenly and cause great loss of life, damage, or hardship. Hurricanes cause significant damage to power distribution systems, resulting in prolonged customer...

Chanda, Suraj

2012-10-19T23:59:59.000Z

364

A distributed boundary detection algorithm for multi-robot systems  

E-Print Network [OSTI]

We describe a distributed boundary detection algorithm suitable for use on multi-robot systems with dynamic network topologies. We assume that each robot has access to its local network geometry, which is the combination ...

McLurkin, James

365

Leader Election in Asynchronous Distributed Systems Scott D. Stoller  

E-Print Network [OSTI]

Leader Election in Asynchronous Distributed Systems Scott D. Stoller March 9, 2000 Abstract cation, which is satis ed by the Invitation Algorithm and never forces nodes that cannot directly

Stoller, Scott

366

Process and dataflow control in distributed data-intensive systems  

Science Journals Connector (OSTI)

In dataflow architectures, each dataflow operation is typically executed on a single physical node. We are concerned with distributed data-intensive systems, in which each base (i.e., persistent) set of data has been declustered over many physical ...

W. Alexander; G. Copeland

1988-06-01T23:59:59.000Z

367

Statistical estimation of water distribution system pipe break risk  

E-Print Network [OSTI]

The deterioration of pipes in urban water distribution systems is of concern to water utilities throughout the world. This deterioration generally leads to pipe breaks and leaks, which may result in reduction in the water-carrying capacity...

Yamijala, Shridhar

2009-05-15T23:59:59.000Z

368

Universal software packages to model the distributed-parameter systems  

Science Journals Connector (OSTI)

Consideration was given to the universal software packages for modeling objects and distributed-parameter systems obeying the partial differential equations. The packages may serve as important tools for industrial automation because the majority of ... Keywords: 07.05.Tp

E. E. Dudnikov

2009-01-01T23:59:59.000Z

369

Photovoltaic Systems Interconnected onto Secondary Network Distribution Systems – Success Stories  

Broader source: Energy.gov [DOE]

This report examines six case studies of photovoltaic (PV) systems integrated into secondary network systems. The six PV systems were chosen for evaluation because they are interconnected to secondary network systems located in four major Solar America Cities.

370

Green field planning of distribution systems  

Science Journals Connector (OSTI)

It as an evident that the everyday life is basically based on electric power. Electric power networks provide the required power to the customers. However as greater amounts of power are daily demanded, the need for the construction of new networks or ... Keywords: energy transmission, green field approach, power demand, power loss, power system modelling, voltage drop

S. Hadjiionas; D. S. Oikonomou; G. P. Fotis; V. Vita; L. Ekonomou; C. Pavlatos

2009-05-01T23:59:59.000Z

371

PROTECTIVE SYSTEMS FOR RURAL ELECTRICAL DISTRIBUTION  

Science Journals Connector (OSTI)

... a system entirely protected by Petersen coils, and (6) the interruption in supply to substations connected to healthy lines between switching points must of necessity sometimes be experienced, it ... event of the fault being on the last section in the series, or in a substation structure, that the full sequence of operation takes place. ...

1943-07-03T23:59:59.000Z

372

Residential hot water distribution systems: Roundtablesession  

SciTech Connect (OSTI)

Residential building practice currently ignores the lossesof energy and water caused by the poor design of hot water systems. Theselosses include: combustion and standby losses from water heaters, thewaste of water (and energy) while waiting for hot water to get to thepoint of use; the wasted heat as water cools down in the distributionsystem after a draw; heat losses from recirculation systems and thediscarded warmth of waste water as it runs down the drain. Severaltechnologies are available that save energy (and water) by reducing theselosses or by passively recovering heat from wastewater streams and othersources. Energy savings from some individual technologies are reported tobe as much as 30 percent. Savings calculations of prototype systemsincluding bundles of technologies have been reported above 50 percent.This roundtable session will describe the current practices, summarizethe results of past and ongoing studies, discuss ways to think about hotwater system efficiency, and point to areas of future study. We will alsorecommend further steps to reduce unnecessary losses from hot waterdistribution systems.

Lutz, James D.; Klein, Gary; Springer, David; Howard, Bion D.

2002-08-01T23:59:59.000Z

373

Distributed Timing and Triggering Control System  

SciTech Connect (OSTI)

This document is a slide show type presentation regarding the need and realization of a new control system for work at the Nevada National Security Site. Commercial products that met the need are identified, both hardware and software. Particular emphasis is on the Integrated Signal Programmer.

Bowen, T., Huerta, J. A.

2012-08-01T23:59:59.000Z

374

Parallel and Distributed Systems Speaker: Dick Epema  

E-Print Network [OSTI]

systems Online Social Netw. #12;3 M.Sc. Thesis Projects: The Supervision · We help you excel, without is international · We often organize the top international conferences in our field #12;4 M.Sc. Thesis Projects concepts and show that they work · For examples of previous MSc projects see the theses on the PDS website

Kuzmanov, Georgi

375

Applications of Automatic Vehicle Location systems towards improving service reliability and operations planning in London  

E-Print Network [OSTI]

Technological advances in the transit industry, such as the introduction of Automatic Vehicle Location (AVL) systems, have provided agencies with robust data collection and measurement systems and enabled the development ...

Ehrlich, Joseph Emanuel

2010-01-01T23:59:59.000Z

376

Effect of HVDC component enhancement on the overall system reliability performance  

SciTech Connect (OSTI)

This paper examines several HVDC transmission system component enhancement schemes as they affect the overall system availability using a system model based on a practical system and actual system outage data. A frequency and duration approach is used in modeling the system components such as valve-groups, converter transformers, smoothing reactors, pole, and bipole controls, transmission lines, and the overall system model developed. This model is used to compare the impact on the overall system availability of different methods of HVDC converter enhancement. These methods include the addition of spare converter transformers, spare smoothing reactors, replacement of valves, and increase of converter rating. Finally the costs of typical enhancements are compared with the benefits arising with the improved availability using a cost-benefit analysis.

Kuruganty, S. (Univ. of North Dakota, Grand Forks, ND (United States). Dept. of Electrical Engineering)

1994-01-01T23:59:59.000Z

377

Water Distribution and Wastewater Systems Operators (North Dakota) |  

Broader source: Energy.gov (indexed) [DOE]

Water Distribution and Wastewater Systems Operators (North Dakota) Water Distribution and Wastewater Systems Operators (North Dakota) Water Distribution and Wastewater Systems Operators (North Dakota) < Back Eligibility Utility Fed. Government Commercial Agricultural Investor-Owned Utility State/Provincial Govt Industrial Construction Municipal/Public Utility Local Government Residential Installer/Contractor Rural Electric Cooperative Tribal Government Low-Income Residential Schools Retail Supplier Institutional Multi-Family Residential Systems Integrator Fuel Distributor Nonprofit General Public/Consumer Transportation Program Info State North Dakota Program Type Siting and Permitting All public water supply and wastewater disposal systems are subject to classification and regulation by the State of North Dakota, and must obtain certification from the State Department of Health

378

Buildings Energy Data Book: 5.5 Thermal Distribution Systems  

Buildings Energy Data Book [EERE]

5 5 Typical Commercial Building Thermal Energy Distribution Design Load Intensities (Watts per SF) Distribution System Fans Other Central System Supply Fans Cooling Tower Fan Central System Return Fans Air-Cooled Chiller Condenser Fan 0.6 Terminal Box Fans 0.5 Exhaust Fans (2) Fan-Coil Unit Fans (1) Condenser Fans 0.6 Packaged or Split System Indoor Blower 0.6 Pumps Chilled Water Pump Condenser Water Pump Heating Water Pump Note(s): Source(s): 0.1 - 0.2 0.1 - 0.2 1) Unducted units are lower than those with some ductwork. 2) Strong dependence on building type. BTS/A.D. Little, Energy Consumption Characteristics of Commercial Building HVAC Systems, Volume II:Thermal Distribution, Auxiliary Equipment, and Ventilation, Oct. 1999, Table 3-1, p. 3-6. 0.3 - 1.0 0.1 - 0.3 0.1 - 0.4

379

Reliability implications of price responsive demand : a study of New England's power system  

E-Print Network [OSTI]

With restructuring of the traditional, vertically integrated electricity industry come new opportunities for electricity demand to actively participate in electricity markets. Traditional definitions of power system ...

Whitaker, Andrew C. (Andrew Craig)

2011-01-01T23:59:59.000Z

380

Multiple Coaxial Catheter System for Reliable Access in Interventional Stroke Therapy  

SciTech Connect (OSTI)

In some patients with acute cerebral vessel occlusion, navigating mechanical thrombectomy systems is difficult due to tortuous anatomy of the aortic arch, carotid arteries, or vertebral arteries. Our purpose was to describe a multiple coaxial catheter system used for mechanical revascularization that helps navigation and manipulations in tortuous vessels. A triple or quadruple coaxial catheter system was built in 28 consecutive cases presenting with acute ischemic stroke. All cases were treated by mechanical thrombectomy with the Penumbra System. In cases of unsuccessful thrombo-aspiration, additional thrombolysis or angioplasty with stent placement was used for improving recanalization. The catheter system consisted of an outermost 8-Fr and an intermediate 6-Fr guiding catheter, containing the inner Penumbra reperfusion catheters. The largest, 4.1-Fr, reperfusion catheter was navigated over a Prowler Select Plus microcatheter. The catheter system provided access to reach the cerebral lesions and provided stability for the mechanically demanding manipulations of thromboaspiration and stent navigation in all cases. Apart from their mechanical role, the specific parts of the system could also provide access to different types of interventions, like carotid stenting through the 8-Fr guiding catheter and intracranial stenting and thrombolysis through the Prowler Select Plus microcatheter. In this series, there were no complications related to the catheter system. In conclusion, building up a triple or quadruple coaxial system proved to be safe and efficient in our experience for the mechanical thrombectomy treatment of acute ischemic stroke.

Kulcsar, Zsolt, E-mail: kulcsarzsolt22@gmail.com; Yilmaz, Hasan [Geneva University Hospital, Neurointerventional Division, Department of Clinical Neurosciences (Switzerland); Bonvin, Christophe [Geneva University Hospital, Neurology Division, Department of Clinical Neurosciences (Switzerland); Lovblad, Karl O. [Geneva University Hospital, Diagnostic Neuroradiology Division, Department of Radiology (Switzerland); Ruefenacht, Daniel A. [Geneva University Hospital, Neurointerventional Division, Department of Clinical Neurosciences (Switzerland)

2010-12-15T23:59:59.000Z

Note: This page contains sample records for the topic "distribution system reliability" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Reliability of the U.S. electric system -- Recent trends and current issues  

E-Print Network [OSTI]

Hours (SAIDI) and Events (SAIFI) that Have Resulted fromand Current Issues SAIDI SAIFI SC SCADA SERC SPP TO UPS VARof interruptions. 1. SAIFI (System Average Interruption

Osborn, Julie; Kawann, Cornelia

2002-01-01T23:59:59.000Z

382

Data transmission system with distributed microprocessors  

DOE Patents [OSTI]

A data transmission system having a common request line and a special request line in addition to a transmission line. The special request line has priority over the common request line. A plurality of node stations are multi-drop connected to the transmission line. Among the node stations, a supervising station is connected to the special request line and takes precedence over other slave stations to become a master station. The master station collects data from the slave stations. The station connected to the common request line can assign a master control function to any station requesting to be assigned the master control function within a short period of time. Each station has an auto response control circuit. The master station automatically collects data by the auto response controlling circuit independently of the microprocessors of the slave stations.

Nambu, Shigeo (Fuchu, JP)

1985-01-01T23:59:59.000Z

383

Linear quadratic regulator for time-varying hyperbolic distributed parameter systems  

Science Journals Connector (OSTI)

......concentration along the reactor are shown in Figure 2. To assess the reliability of the above algorithm...Contribution to the analysis and control of distributed...2001) Trajectory analysis of nonisothermal tubular reactor nonlinear models......

Ilyasse Aksikas; J. Fraser Forbes

2010-09-01T23:59:59.000Z

384

Advanced islanding detection utilized in distribution systems with DFIG  

Science Journals Connector (OSTI)

Abstract The penetration of distributed generation (DG) in electrical power systems is rapidly increasing these days and more attention is drawn to maintain a healthy distribution system. Islanding operation of \\{DGs\\} is one of the biggest challenges to the distribution system stability. Fast and accurate islanding detection can avoid the possibility of damages to the \\{DGs\\} when they are un-intentionally reconnected to the grid and also provide useful information to the protection and automation design of the stand alone operated system. Rate of change of frequency (ROCOF) method is one of the most commonly employed anti-islanding protection techniques, it offers fast detection and easy implementation. However, it is often easily affected by the system disturbance and might not able to detect the islanding situation if the power imbalance between the DG and the load is small. This paper investigates an inter-lock method which can improve the performance of rate of change of frequency (ROCOF) by applying system impedance estimation. It was found that this new method can help in verifying the ROCOF relay islanding detection and avoiding false operations of ROCOF in a grid connected distribution system which has large load variations. The proposed method was verified using the experimental testing results derived from both an experimental testing model which includes an 8 kW Double Feed Induction Generator (DFIG) and a 9 MW DFIG simulation system.

Ke Jia; Tianshu Bi; Bohan Liu; David Thomas; Andrew Goodman

2014-01-01T23:59:59.000Z

385

DOE Hydrogen Analysis Repository: Distributed Hydrogen Fueling Systems  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Distributed Hydrogen Fueling Systems Analysis Distributed Hydrogen Fueling Systems Analysis Project Summary Full Title: H2 Production Infrastructure Analysis - Task 1: Distributed Hydrogen Fueling Systems Analysis Project ID: 78 Principal Investigator: Brian James Keywords: Hydrogen infrastructure; costs; methanol; hydrogen fueling Purpose As the DOE considers both direct hydrogen and reformer-based fuel cell vehicles, it is vital to have a clear perspective of the relative infrastructure costs to supply each prospective fuel (gasoline, methanol, or hydrogen). Consequently, this analysis compares these infrastructure costs as well as the cost to remove sulfur from gasoline (as will most likely be required for use in fuel cell systems) and the cost implications for several hydrogen tank filling options. This analysis supports Analysis

386

New Water Booster Pump System Reduces Energy Consumption by 80 Percent and Increases Reliability  

Broader source: Energy.gov [DOE]

This case study outlines how General Motors (GM) developed a highly efficient pumping system for their Pontiac Operations Complex in Pontiac, Michigan. In short, GM was able to replace five original 60- to 100-hp pumps with three 15-hp pumps whose speed could be adjusted to meet plant requirements. As a result, the company reduced pumping system energy consumption by 80 percent (225,100 kWh per year), saving an annual $11,255 in pumping costs. With a capital investment of $44,966 in the energy efficiency portion of their new system, GM projected a simple payback of 4 years.

387

Reliability of torque and temperature feedback for an autonomous glass monitoring system  

E-Print Network [OSTI]

Automated pipe turners used in glassblowing studios are limited in their application by the duration a blown glass piece can be left unattended. An autonomous monitoring system can increase the usefulness of pipe turners ...

Becker, Kaitlyn P. (Kaitlyn Patricia)

2009-01-01T23:59:59.000Z

388

Distributed Generation System Characteristics and Costs in the Buildings  

Gasoline and Diesel Fuel Update (EIA)

1.6 mb) 1.6 mb) Appendix A - Photovoltaic (PV) Cost and Performance Characteristics for Residential and Commercial Applications (1.0 mb) Appendix B - The Cost and Performance of Distributed Wind Turbines, 2010-35 (0.5 mb) Distributed Generation System Characteristics and Costs in the Buildings Sector Release date: August 7, 2013 Distributed generation in the residential and commercial buildings sectors refers to the on-site generation of energy, often electricity from renewable energy systems such as solar photovoltaics (PV) and small wind turbines. Many factors influence the market for distributed generation, including government policies at the local, state, and federal level, and project costs, which vary significantly depending on time, location, size, and application.

389

Performance of thermal distribution systems in large commercial buildings  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Performance of thermal distribution systems in large commercial buildings Performance of thermal distribution systems in large commercial buildings Title Performance of thermal distribution systems in large commercial buildings Publication Type Journal Article LBNL Report Number LBNL-44331 Year of Publication 2002 Authors Xu, Tengfang T., François Rémi Carrié, Darryl J. Dickerhoff, William J. Fisk, Jennifer A. McWilliams, Duo Wang, and Mark P. Modera Journal Energy and Buildings Volume 34 Start Page Chapter Pagination 215-226 Abstract This paper presents major findings of a field study on the performance of five thermal distribution systems in four large commercial buildings. The five systems studied are typical single-duct or dual-duct constant air volume (CAV) systems and variable air volume (VAV) systems, each of which serves an office building or a retail building with floor area over 2,000 m2. The air leakage from ducts are reported in terms of effective leakage area (ELA) at 25 Pa reference pressure, the ASHRAE-defined duct leakage class, and air leakage ratios. The specific ELAs ranged from 0.7 to 12.9 cm2 per m2 of duct surface area, and from 0.1 to 7.7 cm2 per square meter of floor area served. The leakage classes ranged from 34 to 757 for the five systems and systems sections tested. The air leakage ratios are estimated to be up to one-third of the fan- supplied airflow in the constant-air-volume systems. The specific ELAs and leakage classes indicate that air leakage in large commercial duct systems varies significantly from system to system, and from system section to system section even within the same thermal distribution system. The duct systems measured are much leakier than the ductwork specified as "unsealed ducts" by ASHRAE. Energy losses from supply ducts by conduction (including convection and radiation) are found to be significant, on the scale similar to the losses induced by air leakage in the duct systems. The energy losses induced by leakage and conduction suggest that there are significant energy-savings potentials from duct-sealing and insulation practice in large commercial buildings

390

Reliability evaluation of electric power generation systems including unconventional energy sources  

E-Print Network [OSTI]

System Used in Case Study Table 5. Interstate Transition Rates of Units in Base System Table 6. Comparison of LOLE Results for January 1982 Table 7. Comparison of LOLE Results for July 1982 . Table 8. Comparison of Frequency Results for January 1982... Table 9. Comparison of Frequency Results for July 1982 Table 10. Comparison of CPU secs Used by III and IV 27 36 50 52 55 55 56 56 57 CHAPTER I INTRODUCTION 1. 1 Alternative Energy Sources In recent years, the escalation in the cost...

Lago-Gonzalez, Alex

1984-01-01T23:59:59.000Z

391

System Verification Through Reliability, Availability, Maintainability (RAM) Analysis & Technology Readiness Levels (TRLs)  

SciTech Connect (OSTI)

The Next Generation Nuclear Plant (NGNP) Project, managed by the Idaho National Laboratory (INL), is authored by the Energy Policy Act of 2005, to research, develop, design, construct, and operate a prototype fourth generation nuclear reactor to meet the needs of the 21st Century. A section in this document proposes that the NGNP will provide heat for process heat applications. As with all large projects developing and deploying new technologies, the NGNP is expected to meet high performance and availability targets relative to current state of the art systems and technology. One requirement for the NGNP is to provide heat for the generation of hydrogen for large scale productions and this process heat application is required to be at least 90% or more available relative to other technologies currently on the market. To reach this goal, a RAM Roadmap was developed highlighting the actions to be taken to ensure that various milestones in system development and maturation concurrently meet required availability requirements. Integral to the RAM Roadmap was the use of a RAM analytical/simulation tool which was used to estimate the availability of the system when deployed based on current design configuration and the maturation level of the system.

Emmanuel Ohene Opare, Jr.; Charles V. Park

2011-06-01T23:59:59.000Z

392

Modelling repairable system reliability with explanatory variables and repair and maintenance actions  

Science Journals Connector (OSTI)

......However, in general, in RMs...overhaul of an engine (a midlife...used with diesel engines...g. from diesel engines, such as...is a quite general model, and...analysis of diesel engine failure data...systems with general repair......

Diederik Lugtigheid; agan Banjevic; Andrew K. S. Jardine

2004-04-01T23:59:59.000Z

393

Scheduling of Real-Time Embedded Systems under Reliability and Power Constraints  

E-Print Network [OSTI]

Alain Girault Hamoudi Kalla RTSE team, ENSEM POPART team, INRIA REDS team University Hassan II is defined as the probability that none of the system components will fail while processing. We present, produces a static multiprocessor schedule that optimizes three criteria: its length (crucial for real

Paris-Sud XI, Université de

394

Reliable GPS-Based Timing for Power Systems: A Multi-Layered Multi-Receiver Architecture  

E-Print Network [OSTI]

a victim receiver's reported position, time, or both. In a future scenario where PMU data play signal and data process- ing; most of the countermeasures exploit the static and networked nature of time measurement unit (PMU), also known as synchrophasor, is a device capable of measuring power system voltage

Gao, Grace Xingxin

395

Distributed Generation System Characteristics and Costs in the Buildings Sector  

Gasoline and Diesel Fuel Update (EIA)

Distributed Generation System Distributed Generation System Characteristics and Costs in the Buildings Sector August 2013 Independent Statistics & Analysis www.eia.gov U.S. Department of Energy Washington, DC 20585 U.S. Energy Information Administration | Distributed Generation System Characteristics and Costs in the Buildings Sector i This report was prepared by the U.S. Energy Information Administration (EIA), the statistical and analytical agency within the U.S. Department of Energy. By law, EIA's data, analyses, and forecasts are independent of approval by any other officer or employee of the United States Government. The views in this report therefore should not be construed as representing those of the U.S. Department of Energy or other Federal agencies.

396

Pressure Regain Strategies for Existing Air Distribution Systems  

Broader source: Energy.gov (indexed) [DOE]

Pressure Regain Strategies for Pressure Regain Strategies for Existing Air Distribution Systems Arlan Burdick IBACOS, Inc. Pressure Regain Strategies for Existing Air Distribution Systems Problem Statement Thermal enclosure upgrades can reduce peak loads by 50%. If the furnace is right-sized for this new peak load and the ducts are not modified or replaced, the resulting airflows at the supply registers will be significantly reduced. -Will the outlets meet industry standards for performance? - Should they be replaced to achieve good room air mixing? - Should the end of the duct be modified to improve airflow characteristics? Pressure Regain Strategies for Existing Air Distribution Systems Expected Results We expect to find a cost-effective solution to gaining proper airflow to a room without completely replacing

397

Category:Smart Grid Projects - Electric Distributions Systems | Open Energy  

Open Energy Info (EERE)

Distributions Systems category. Distributions Systems category. Pages in category "Smart Grid Projects - Electric Distributions Systems" The following 13 pages are in this category, out of 13 total. A Atlantic City Electric Company Smart Grid Project Avista Utilities Smart Grid Project C Consolidated Edison Company of New York, Inc. Smart Grid Project E El Paso Electric Smart Grid Project H Hawaii Electric Co. Inc. Smart Grid Project M Memphis Light, Gas and Water Division Smart Grid Project Municipal Electric Authority of Georgia Smart Grid Project N Northern Virginia Electric Cooperative Smart Grid Project NSTAR Electric Company Smart Grid Project P Powder River Energy Corporation Smart Grid Project P cont. PPL Electric Utilities Corp. Smart Grid Project S Snohomish County Public Utilities District Smart Grid Project

398

Emergence of energy storage technologies as the solution for reliable operation of smart power systems: A review  

Science Journals Connector (OSTI)

Abstract The ever increasing penetration of renewable energy systems (RESs) in today deregulated intelligent power grids, necessitates the use of electrical storage systems. Energy storage systems (ESSs) are helpful to make balance between generation and demand improving the performance of whole power grid. In collaboration with RESs, energy storage devices can be integrated into the power networks to bring ancillary service for the power system and hence enable an increased penetration of distributed generation (DG) units. This paper presents different applications of electrical energy storage technologies in power systems emphasizing on the collaboration of such entities with RESs. The role of \\{ESSs\\} in intelligent micropower grids is also discussed where the stochastic nature of renewable energy sources may affect the power quality. Particular attention is paid to flywheel storage, electrochemical storage, pumped hydroelectric storage, and compressed air storage and their operating principle are discussed as well. The application of each type in the area of power system is investigated and compared to others.

Sam Koohi-Kamali; V.V. Tyagi; N.A. Rahim; N.L. Panwar; H. Mokhlis

2013-01-01T23:59:59.000Z

399

IMPROVEMENT TO PIPELINE COMPRESSOR ENGINE RELIABILITY THROUGH RETROFIT MICRO-PILOT IGNITION SYSTEM  

SciTech Connect (OSTI)

This report documents a 3-year research program conducted by the Engines & Energy Conversion Laboratory (EECL) at Colorado State University (CSU) to develop micropilot ignition systems for existing pipeline compressor engines. Research activities for the overall program were conducted with the understanding that the efforts are to result in a commercial product to capture and disseminate the efficiency and environmental benefits of this new technology. An extensive state-of-art review was conducted to leverage the existing body of knowledge of micropilot ignition with respect to retrofit applications. Additionally, commercially-available fuel injection products were identified and applied to the program where appropriate. This approach will minimize the overall time-to-market requirements, while meeting performance and cost criteria. The objective for Phase I was to demonstrate the feasibility of micropilot ignition for large bore, slow speed engines operating at low compression ratios under laboratory conditions at the EECL. The primary elements of Micropilot Phase I were to develop a single-cylinder test chamber to study the injection of pilot fuel into a combustion cylinder and to develop, install and test a multi-cylinder micropilot ignition system for a 4-cylinder, natural gas test engine. In all, there were twelve (12) tasks defined and executed to support these two (2) primarily elements in a stepwise fashion. Task-specific approaches and results are documented in this report. The four-cylinder prototype data was encouraging for the micro-pilot ignition technology when compared to spark ignition. The objective for Phase II was to further develop and optimize the micropilot ignition system at the EECL for large bore, slow speed engines operating at low compression ratios. The primary elements of Micropilot Phase II were to evaluate the results for the 4-cylinder system prototype developed for Phase I, then optimize this system and prepare the technology for the field demonstration phase in Year 3. In all, there were twelve (12) tasks defined and executed to support objectives in a stepwise fashion. The optimized four-cylinder system data demonstrated significant progress compared to Phase I results, as well as traditional spark ignition systems. These laboratory results were enhanced, then verified via a field demonstration project during Phase III of the Micropilot Ignition program. An Implementation Team of qualified engine retrofit service providers was assembled to install the retrofit micropilot ignition system on an engine operated by El Paso Pipeline Group at a compressor station near Window Rock, Arizona. Testing of this demonstration unit showed that the same benefits identified by laboratory testing at CSU, i.e., reduced fuel consumption and exhaust emissions (NOx, THC, CO, and CH2O). Commercialization of the retrofit micropilot ignition technology is awaiting a ''market pull'', which is expected to materialize as the results of the field demonstration become known and accepted. The Implementation Team, comprised of Woodward Governor Company, Enginuity LLC, Hoerbiger Corporation of America, and DigiCon Inc., has direct experience with the technology development and implementation, and stands ready to promote and commercialize the retrofit micropilot ignition system.

Scott Chase; Daniel Olsen; Ted Bestor

2005-05-01T23:59:59.000Z

400

US Recovery Act Smart Grid Projects - Electric Distributions Systems | Open  

Open Energy Info (EERE)

Distributions Systems Distributions Systems Jump to: navigation, search CSV Loading map... {"format":"googlemaps3","type":"ROADMAP","types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"limit":500,"offset":0,"link":"all","sort":[""],"order":[],"headers":"show","mainlabel":"","intro":"","outro":"","searchlabel":"\u2026 further results","default":"","geoservice":"google","zoom":false,"width":"600px","height":"350px","centre":false,"layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","icon":"","visitedicon":"","forceshow":true,"showtitle":true,"hidenamespace":false,"template":false,"title":"","label":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"locations":[{"text":"

Note: This page contains sample records for the topic "distribution system reliability" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

E-Print Network 3.0 - air-distribution systems interactions Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Distribution Systems Bass Abushakra Iain S. Walker... , and the installation of supply boots and diffusers. Introduction The installation of air distribution systems... in the...

402

Onsite Distributed Generation Systems For Laboratories, Laboratories for the 21st Century: Best Practices (Brochure)  

SciTech Connect (OSTI)

This guide provides general information on implementing onsite distributed generation systems in laboratory environments. Specific technology applications, general performance information, and cost data are provided to educate and encourage laboratory energy managers to consider onsite power generation or combined heat and power (CHP) systems for their facilities. After conducting an initial screening, energy managers are encouraged to conduct a detailed feasibility study with actual cost and performance data for technologies that look promising. Onsite distributed generation systems are small, modular, decentralized, grid-connected, or off-grid energy systems. These systems are located at or near the place where the energy is used. These systems are also known as distributed energy or distributed power systems. DG technologies are generally considered those that produce less than 20 megawatts (MW) of power. A number of technologies can be applied as effective onsite DG systems, including: (1) Diesel, natural gas, and dual-fuel reciprocating engines; (2) Combustion turbines and steam turbines; (3) Fuel cells; (4) Biomass heating; (5) Biomass combined heat and power; (6) Photovoltaics; and (7) Wind turbines. These systems can provide a number of potential benefits to an individual laboratory facility or campus, including: (1) High-quality, reliable, and potentially dispatchable power; (2) Low-cost energy and long-term utility cost assurance, especially where electricity and/or fuel costs are high; (3) Significantly reduced greenhouse gas (GHG) emissions. Typical CHP plants reduce onsite GHG by 40 to 60 percent; (4) Peak demand shaving where demand costs are high; (5) CHP where thermal energy can be used in addition to electricity; (6) The ability to meet standby power needs, especially where utility-supplied power is interrupted frequently or for long periods and where standby power is required for safety or emergencies; and (7) Use for standalone or off-grid systems where extending the grid is too expensive or impractical. Because they are installed close to the load, DG systems avoid some of the disadvantages of large, central power plants, such as transmission and distribution losses over long electric lines.

Not Available

2011-09-01T23:59:59.000Z

403

A new mathematical approach to multi-area power system reliability evaluation  

E-Print Network [OSTI]

the first stage of the decomposition process. 19 Subset of acceptable states MlM2 . . . M? A, V, 2 vl ? 1 M2 ~ . M? Ll ml m2 ~ ~ ~ ~ ~ ~ 7B? ul ? 1 M2 ~ M? Ul Vl V2 Ml v2 ? 1 ~ M? L2 vl pn2 Mlul ? 1 M? Ul Bl V2 Ml M2 . . . M? Subset... of unclassified states being decomposed MlM2 . v?? 1 Vl V2 ~ ~ ~ ~ Bl? Ml Ml . -. . u?? 1 U. ul G2 ''' ' V? Disjoint subsets of system loss-of-load states Disjoint subsets of unclassified states Fig. 2. Decomposition of an unclassified set U 20 2...

Pathak, Rajesh

2012-06-07T23:59:59.000Z

404

Building Reliable Clients and Douglas Thain and Miron Livny  

E-Print Network [OSTI]

chapters have introduced the basic principles of service-oriented architecture and OGSA (279), explained contexts: remote execution, work organization, and data output. 19.1 PRINCIPLES OF RELIABLE SYSTEMS We first introduce some general design principles that apply to distributed systems and, in particular

Liblit, Ben

405

Internal electrolyte supply system for reliable transport throughout fuel cell stacks  

DOE Patents [OSTI]

An improved internal electrolyte supply system in a fuel cell stack employs a variety of arrangements of grooves and passages in bipolar plates of the multiplicity of repeating fuel cells to route gravity-assisted flowing electrolyte throughout the stack. The grooves route electrolyte flow along series of first paths which extend horizontally through the cells between the plates thereof. The passages route electrolyte flow along series of second paths which extend vertically through the stack so as to supply electrolyte to the first paths in order to expose the electrolyte to the matrices of the cells. Five different embodiments of the supply system are disclosed. Some embodiments employ wicks in the grooves for facilitating transfer of the electrolyte to the matrices as well as providing support for the matrices. Additionally, the passages of some embodiments by-pass certain of the grooves and supply electrolyte directly to other of the grooves. Some embodiments employ single grooves and others have dual grooves. Finally, in some embodiments the passages are connected to the grooves by a step which produces a cascading electrolyte flow.

Wright, Maynard K. (Bethel Park, PA); Downs, Robert E. (Monroeville, PA); King, Robert B. (Westlake, OH)

1988-01-01T23:59:59.000Z

406

Sample sizes for confidence limits for reliability.  

SciTech Connect (OSTI)

We recently performed an evaluation of the implications of a reduced stockpile of nuclear weapons for surveillance to support estimates of reliability. We found that one technique developed at Sandia National Laboratories (SNL) under-estimates the required sample size for systems-level testing. For a large population the discrepancy is not important, but for a small population it is important. We found that another technique used by SNL provides the correct required sample size. For systems-level testing of nuclear weapons, samples are selected without replacement, and the hypergeometric probability distribution applies. Both of the SNL techniques focus on samples without defects from sampling without replacement. We generalized the second SNL technique to cases with defects in the sample. We created a computer program in Mathematica to automate the calculation of confidence for reliability. We also evaluated sampling with replacement where the binomial probability distribution applies.

Darby, John L.

2010-02-01T23:59:59.000Z

407

Integrating Renewable Energy into the Transmission and Distribution System  

Broader source: Energy.gov (indexed) [DOE]

Integrating Renewable Energy into the Transmission and Distribution Integrating Renewable Energy into the Transmission and Distribution System of the U.S. Virgin Islands Integrating Renewable Energy into the Transmission and Distribution System of the U.S. Virgin Islands This report describes one area in which islands may lead: integrating a high percentage of renewable energy resources into an isolated grid. In addition, it explores the challenges, feasibility, and potential benefits of interconnecting the USVI grids with the much larger Puerto Rican grid. 51294.pdf More Documents & Publications USVI Energy Road Map: Charting the Course to a Clean Energy Future (Brochure), EDIN (Energy Development in Island Nations), U.S. Virgin Islands U.S. Virgin Islands Energy Road Map: Analysis Waste-to-Energy Evaluation: U.S. Virgin Islands

408

Paradigm shift in urban energy systems through distributed generation: Methods and models  

Science Journals Connector (OSTI)

The path towards energy sustainability is commonly referred to the incremental adoption of available technologies, practices and policies that may help to decrease the environmental impact of energy sector, while providing an adequate standard of energy services. The evaluation of trade-offs among technologies, practices and policies for the mitigation of environmental problems related to energy resources depletion requires a deep knowledge of the local and global effects of the proposed solutions. While attempting to calculate such effects for a large complex system like a city, an advanced multidisciplinary approach is needed to overcome difficulties in modeling correctly real phenomena while maintaining computational transparency, reliability, interoperability and efficiency across different levels of analysis. Further, a methodology that rationally integrates different computational models and techniques is necessary to enable collaborative research in the field of optimization of energy efficiency strategies and integration of renewable energy systems in urban areas. For these reasons, a selection of currently available models for distributed generation planning and design is presented and analyzed in the perspective of gathering their capabilities in an optimization framework to support a paradigm shift in urban energy systems. This framework embodies the main concepts of a local energy management system and adopts a multicriteria perspective to determine optimal solutions for providing energy services through distributed generation.

Massimiliano Manfren; Paola Caputo; Gaia Costa

2011-01-01T23:59:59.000Z

409

IMPROVEMENT TO PIPELINE COMPRESSOR ENGINE RELIABILITY THROUGH RETROFIT MICRO-PILOT IGNITION SYSTEM-PHASE I  

SciTech Connect (OSTI)

This report documents the first year's effort towards a 3-year program to develop micropilot ignition systems for existing pipeline compressor engines. In essence, all Phase I goals and objectives were met. We intend to proceed with the Phase II research plan, as set forth by the applicable Research Management Plan. The objective for Phase I was to demonstrate the feasibility of micropilot ignition for large bore, slow speed engines operating at low compression ratios. The primary elements of Micropilot Phase I were to develop a single-cylinder test chamber to study the injection of pilot fuel into a combustion cylinder and to develop, install and test a multi-cylinder micropilot ignition system for a 4-cylinder, natural gas test engine. In all, there were twelve (12) tasks defined and executed to support these two (2) primarily elements in a stepwise fashion. Task-specific approaches and results are documented in this report. Research activities for Micropilot Phase I were conducted with the understanding that the efforts are expected to result in a commercial product to capture and disseminate the efficiency and environmental benefits of this new technology. An extensive state-of-art review was conducted to leverage the existing body of knowledge of micropilot ignition with respect to retrofit applications. Additionally, commercially-available fuel injection products were identified and applied to the program where appropriate. This approach will minimize the overall time-to-market requirements, while meeting performance and cost criteria. The four-cylinder prototype data was encouraging for the micro-pilot ignition technology when compared to spark ignition. Initial testing results showed: (1) Brake specific fuel consumption of natural gas was improved from standard spark ignition across the map, 1% at full load and 5% at 70% load. (2) 0% misfires for all points on micropilot ignition. Fuel savings were most likely due to this percent misfire improvement. (3) THC (Total Hydrocarbon) emissions were improved significantly at light load, 38% at 70% load. (4) VOC (Volatile Organic Compounds) emissions were improved above 80% load. (5) Coefficient of Variance for the IMEP (Indicated Mean Effective Pressure) was significantly less at lower loads, 76% less at 70%. These preliminary results will be substantiated and enhanced during Phase II of the Micropilot Ignition program.

Ted Bestor

2003-03-04T23:59:59.000Z

410

Efficient Symbolic Detection of Global Properties in Distributed Systems  

E-Print Network [OSTI]

to total orders containing the happened­before relation. A consistent global state (CGS) of a computation cEfficient Symbolic Detection of Global Properties in Distributed Systems Scott D. Stoller a global state satisfying property \\Phi. Previous general­purpose algorithms for this problem explicitly

Stoller, Scott

411

Distributed Predictive Control and Estimation for Systems with Information  

E-Print Network [OSTI]

constraints and a stationary LQG (Linear Quadratic Gaussian) control law is presented based on the model control and estimation law is demonstrated through a numerical simulation of smart grid. KeywordsDistributed Predictive Control and Estimation for Systems with Information Structures Exemplified

412

SELFMONITORING DISTRIBUTED MONITORING SYSTEM FOR NUCLEAR POWER PLANTS (PRELIMINARY VERSION)  

E-Print Network [OSTI]

SELF­MONITORING DISTRIBUTED MONITORING SYSTEM FOR NUCLEAR POWER PLANTS (PRELIMINARY VERSION) Aldo and identification are extremely important activities for the safety of a nuclear power plant. In particular inside huge and complex production plants. 1 INTRODUCTION Safety in nuclear power plants requires

413

Uni ed Support for Heterogeneous Security Policies in Distributed Systems  

E-Print Network [OSTI]

Uni ed Support for Heterogeneous Security Policies in Distributed Systems Naftaly H. Minsky in this paper a security mechanism that can support e ciently, and in a uni ed manner, a wide range of security policies are de ned formallyandexplicitly,and are enforced bya uni ed mechanism. Each policy under

Minsky, Naftaly

414

Distributed Proving in Access-Control Systems Scott Garriss  

E-Print Network [OSTI]

]). That is, credentials (i.e., certificates) are encoded as formulas in the logic (e.g., "KAlice signed (KBobDistributed Proving in Access-Control Systems Lujo Bauer Scott Garriss Michael K. Reiter§ Abstract- dentials in a formal logic (e.g., [16]). Of particular in- terest here are those in which the evidence

Reiter, Michael

415

Fuzzy logic based operated device identification in power distribution systems  

E-Print Network [OSTI]

of an operated device identification algorithm to be used as one of four modules in an automated modular scheme for fault section estimation on radial distribution systems. This algorithm will be executed in tandem with the other fault location modules that form...

Manivannan, Karthick Muthu

2002-01-01T23:59:59.000Z

416

Topic 5: Renewable Power 1Networking and Distributed Systems  

E-Print Network [OSTI]

Communications and Control in Smart Grid 10 · Wave power is the energy from ocean surface waves. · Orbital motion the device to the ocean floor to hold it. cable Power modules Tubular section #12;Wave Energy Converter DrTopic 5: Renewable Power 1Networking and Distributed Systems Department of Electrical & Computer

Mohsenian-Rad, Hamed

417

DISTRIBUTED VISION SYSTEM FOR ROBOT LOCALISATION IN INDOOR ENVIRONMENT  

E-Print Network [OSTI]

DISTRIBUTED VISION SYSTEM FOR ROBOT LOCALISATION IN INDOOR ENVIRONMENT E. Menegatti, G. Gatto, and E. Pagello Department of Information Engineering Faculty of Engineering, The University of Padua in an environment whose appear- ance is changing in time. We propose an extension to the classical image

Menegatti, Emanuele

418

Application of an Energy Management System to a Distribution Center  

E-Print Network [OSTI]

such a System in its Dallas Distribution Center. In one year the electric bills were reduced by a total of $17,668.91. Electric consumption (KWH) was reduced by thirty-one percent, electrical demand (KW) was reduced by thirty-six percent while plant...

Warnick, T.

1984-01-01T23:59:59.000Z

419

A scenario driven multiobjective Primary–Secondary Distribution System Expansion Planning algorithm in the presence of wholesale–retail market  

Science Journals Connector (OSTI)

This paper presents a novel approach for Integrated Generation and Primary–Secondary Distribution System Expansion Planning (IGDSEP) in the presence of wholesale and retail markets. The proposed method uses a model to explore the impacts of wholesale and retail market on IGDSEP procedure. This algorithm decomposes the IGDSEP problem into six subproblems to achieve an optimal expansion planning of a system, in which the investment and operational costs are minimized, while the reliability of the system is maximized. The proposed model of IGDSEP is a Mixed Integer Non Linear Programming (MINLP) problem and a Scenario Driven MINLP (SCMINLP) method is proposed for solving the problem. The algorithm was successfully tested for an urban distribution system.

Mehrdad Setayesh Nazar; Mahmood R. Haghifam; Mëhran Nažar

2012-01-01T23:59:59.000Z

420

Commercial thermal distribution systems, Final report for CIEE/CEC  

SciTech Connect (OSTI)

According to the California Energy Commission (CEC 1998a), California commercial buildings account for 35% of statewide electricity consumption, and 16% of statewide gas consumption. Space conditioning accounts for roughly 16,000 GWh of electricity and 800 million therms of natural gas annually, and the vast majority of this space conditioning energy passes through thermal distribution systems in these buildings. In addition, 8600 GWh per year is consumed by fans and pumps in commercial buildings, most of which is used to move the thermal energy through these systems. Research work at Lawrence Berkeley National Laboratory (LBNL) has been ongoing over the past five years to investigate the energy efficiency of these thermal distribution systems, and to explore possibilities for improving that energy efficiency. Based upon that work, annual savings estimates of 1 kWh/ft{sup 2} for light commercial buildings, and 1-2 kWh/ft{sup 2} in large commercial buildings have been developed for the particular aspects of thermal distribution system performance being addressed by this project. Those savings estimates, combined with a distribution of the building stock based upon an extensive stock characterization study (Modera et al. 1999a), and technical penetration estimates, translate into statewide saving potentials of 2000 GWh/year and 75 million thermal/year, as well as an electricity peak reduction potential of 0.7 GW. The overall goal of this research program is to provide new technology and application knowledge that will allow the design, construction, and energy services industries to reduce the energy waste associated with thermal distribution systems in California commercial buildings. The specific goals of the LBNL efforts over the past year were: (1) to advance the state of knowledge about system performance and energy losses in commercial-building thermal distribution systems; (2) to evaluate the potential of reducing thermal losses through duct sealing, duct insulation, and improved equipment sizing; and (3) to develop and evaluate innovative techniques applicable to large buildings for sealing ducts and encapsulating internal duct insulation. In the UCB fan project, the goals were: (1) to develop a protocol for testing, analyzing and diagnosing problems in large commercial building built-up air handling systems, and (2) to develop low-cost measurement techniques to improve short term monitoring practices. To meet our stated goals and objectives, this project: (1) continued to investigate and characterize the performance of thermal distribution systems in commercial buildings; (2) performed energy analyses and evaluation for duct-performance improvements for both small and large commercial buildings; (3) developed aerosol injection technologies for both duct sealing and liner encapsulation in commercial buildings; and (4) designed energy-related diagnostic protocols based on short term measurement and used a benchmarking database to compare subject systems with other measured systems for certain performance metrics. This year's efforts consisted of the following distinct tasks: performing characterization measurements for five light commercial building systems and five large-commercial-building systems; analyzing the potential for including duct performance in California's Energy Efficiency Standards for Residential and Non-Residential Buildings (Title 24), including performing energy and equipment sizing analyses of air distribution systems using DOE 2.1E for non-residential buildings; conducting laboratory experiments, field experiments, and modeling of new aerosol injection technologies concepts for sealing and coating, including field testing aerosol-based sealing in two large commercial buildings; improving low-cost fan monitoring techniques measurements, and disseminating fan tools by working with energy practitioners directly where possible and publishing the results of this research and the tools developed on a web-site. The final report consists of five sections listed below. Each section includes its related

Xu, Tengfang; Bechu, Olivier; Carrie, Remi; Dickerhoff, Darryl; Fisk, William; Franconi, Ellen; Kristiansen, Oyvind; Levinson, Ronnen; McWilliams, Jennifer; Wang, Duo; Modera, Mark; Webster, Tom; Ring, Erik; Zhang, Qiang; Huizenga, Charlie; Bauman, Fred; Arens, Ed

1999-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "distribution system reliability" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Implementation of non-intrusive energy saving estimation for Volt/VAr control of smart distribution system  

Science Journals Connector (OSTI)

Abstract There has been a growing interest among power distribution utilities to explore smart grid technologies to improve the operational efficiency and reliability. As electricity distribution grid is evolving to become “smart”, energy demand reduction is one of the goals for the distribution utilities. In order to obtain this goal, utilities need to commit significant financial resources. Therefore, it became important to assess the benefit of new technologies such as Volt/VAr control (VVC). To compute the energy savings due to VVC implementation, existing algorithms are intrusive, and generally require altering the distribution system control settings and operating points, which is undesirable for system operator. On the other hand, these may require large amount of historical data. In this paper, implementation of a new non-intrusive energy saving estimation algorithm has been presented for integrated Volt/VAr control by Avista Utilities in Northwest USA. Developed algorithm utilizes measurements from smart distribution system. Develop algorithm allows studying the energy saving in long term as it requires no change in control settings of actual distribution system. Satisfactory results have been obtained and validated against field data from experiments on real feeders by Avista Utilities.

S. Chanda; F. Shariatzadeh; A. Srivastava; E. Lee; W. Stone; J. Ham

2014-01-01T23:59:59.000Z

422

Power estimation and reliability evaluation of municipal waste water and self-excited induction generator-based micro hydropower generation system  

Science Journals Connector (OSTI)

This paper presents power estimation and reliability evaluation of the micro hydro power generation system based on municipal waste water. Self-excited induction generator was used in the developed power plant, situated at IIT (BHU) campus, Varanasi, India. The hydro potential of the waste water flowing through sewage system of the Banaras Hindu University has been determined for annual flow duration and daily flow duration curves by ordering the recorded waste water from maximum to minimum flows. This paper estimates output power and determines reliability indices like: failure rate, repair rate, MTTF, MTTR and MTBF of the MWW-based developed generation plant. Design parameters of the SEIG with suitable values of the capacitor have been used and recommended for improvement of the power generation quality and reliability of the system.

Lokesh Varshney; R.K. Saket; Saeid Eslamian

2013-01-01T23:59:59.000Z

423

The Fermilab CMTF cryogenic distribution remote control system  

SciTech Connect (OSTI)

The Cryomodule Test Facility (CMTF) is able to provide the necessary test bed for measuring the performance of Superconducting Radio Frequency (SRF) cavities in a cryomodule (CM). The CMTF have seven 300 KW screw compressors, two liquid helium refrigerators, and two Cryomodule Test Stands (CMTS). CMTS1 is designed for 1.3 GHz cryomodule operating in a pulsed mode (PM) and CMTS2 is for cryomodule operating in Half-Wave (HW) and Continuous Wave (CW) mode. Based on the design requirement, each subsystem has to be far away from each other and be placed in distant locations. Therefore choosing Siemens Process Control System 7-400, DL205 PLC, Synoptic and Fermilab ACNET are the ideal choices for CMTF cryogenic distribution real-time remote control system. This paper presents a method which has been successfully used by many Fermilab distribution cryogenic real-time remote control systems.

Pei, L.; Theilacker, J.; Klebaner, A.; Martinez, A.; Bossert, R. [Fermi National Accelerator Laboratory Batavia, IL, 60510 (United States)

2014-01-29T23:59:59.000Z

424

ENERGY STAR Building Upgrade Manual Chapter 8: Air Distribution Systems |  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

8: Air Distribution 8: Air Distribution Systems Secondary menu About us Press room Contact Us Portfolio Manager Login Facility owners and managers Existing buildings Commercial new construction Industrial energy management Small business Service providers Service and product providers Verify applications for ENERGY STAR certification Design commercial buildings Energy efficiency program administrators Commercial and industrial program sponsors Associations State and local governments Federal agencies Tools and resources Training In This Section Campaigns Commercial building design Communications resources Energy management guidance Financial resources Portfolio Manager Products and purchasing Recognition Research and reports Service and product provider (SPP) resources Success stories Target Finder

425

Factor Influencing Logistics Service Providers Efficiency’ in Urban Distribution Systems  

Science Journals Connector (OSTI)

Abstract The increased urbanization and the awareness of freight transportation impacts have stressed the importance of City Logistics (CL) as a comprehensive approach aimed at mitigating the negative effects of distribution activities without penalizing social, cultural, and economic issues. In this context, a crucial role is played by logistics service providers (LSPs). This paper proposes an empirical analysis on the operational factors determining the level of efficiency of a LSP. This study represents an attempt to develop a panel of operational variables supporting the efficiency of the urban distribution system of LSPs. The potential benefits are both economic and environmental.

Alberto De Marco; Anna C. Cagliano; Giulio Mangano; Francesca Perfetti

2014-01-01T23:59:59.000Z

426

Distributed Generation Study/Patterson Farms CHP System Using Renewable  

Open Energy Info (EERE)

Farms CHP System Using Renewable Farms CHP System Using Renewable Biogas < Distributed Generation Study Jump to: navigation, search Study Location Auburn, New York Site Description Agricultural Study Type Field Test Technology Internal Combustion Engine Prime Mover Caterpillar G379 Heat Recovery Systems Built-in Fuel Biogas System Installer Martin Machinery System Enclosure Dedicated Shelter System Application Combined Heat and Power Number of Prime Movers 1 Stand-alone Capability None Power Rating 200 kW0.2 MW 200,000 W 200,000,000 mW 2.0e-4 GW 2.0e-7 TW Nominal Voltage (V) 480 Heat Recovery Rating (BTU/hr) 1366072 Cooling Capacity (Refrig/Tons) Origin of Controller 3rd Party Custom Made Component Integration Customer Assembled Start Date 2007/05/02 Monitoring Termination Date 2007/05/26

427

Laboratories for the 21st Century Best Practices: Onsite Distributed Generation Systems For Laboratories  

Broader source: Energy.gov [DOE]

Guide describes general information on implementing onsite distributed generation systems in laboratory environments.

428

Transmission Pricing of Distributed Multilateral Energy Transactions to Ensure System Security and Guide Economic Dispatch  

E-Print Network [OSTI]

Transmission Pricing of Distributed Multilateral Energy Transactions to Ensure System Security and Guide Economic Dispatch...

Ilic, Marija; Hsieh, Eric; Remanan, Prasad

2004-06-16T23:59:59.000Z

429

2012 SG Peer Review - Wide Area Wireless Distribution Grid Sensor & Faulted Circuit Indicator System for Underground Assets - Jason Wilson, On-Ramp Wireless  

Broader source: Energy.gov (indexed) [DOE]

Wide Area Wireless Distribution Grid Sensor Wide Area Wireless Distribution Grid Sensor for Underground Assets Jason Wilson On-Ramp Wireless June 7, 2012 December 2008 Wide Area Wireless Distribution Grid Sensor for Underground Assets Objective Life-cycle Funding Summary ($K) Prior to FY 12 FY12, authorized FY13, requested Out-year(s) $1,046 $580 $39 $0 Technical Scope Develop and demonstrate a wireless network solution for distribution automation, including fault circuit indicators and transformer monitoring, capable of secure and reliable communication with below ground and hard to reach utility assets at a TCO that is commercially viable for utilities to deploy at large scale. Enable utilities throughout the US to improve critical grid reliability metrics including SAIDI. * Conceptual design and trade studies including sensor system interfaces, augmenting FCI with

430

Revise CS 552: Distributed Systems to CS552: Distributed Real-Time Systems  

E-Print Network [OSTI]

Text Book: Real-Time Systems by Jane W.S. Liu, Prentice Hall, 2000 Research papers: Research papers Liu's book 1 #12;­ Resources and resource access control ­ Multiprocessor scheduling, resource access

Heller, Barbara

431

The design of a distributed image processing and dissemination system  

SciTech Connect (OSTI)

The design and implementation of a distributed image processing and dissemination system was undertaken and accomplished as part of a prototype communication and intelligence (CI) system, the contingency support system (CSS), which is intended to support contingency operations of the Tactical Air Command. The system consists of six (6) Sun 3/180C workstations with integrated ITEX image processors and three (3) 3/50 diskless workstations located at four (4) system nodes (INEL, base, and mobiles). All 3/180C workstations are capable of image system server functions where as the 3/50s are image system clients only. Distribution is accomplished via both local and wide area networks using standard Defense Data Network (DDN) protocols (i.e., TCP/IP, et al.) and Defense Satellite Communication Systems (DSCS) compatible SHF Transportable Satellite Earth Terminals (TSET). Image applications utilize Sun's Remote Procedure Call (RPC) to facilitate the image system client and server relationships. The system provides functions to acquire, display, annotate, process, transfer, and manage images via an icon, panel, and menu oriented Sunview{trademark} based user interface. Image spatial resolution is 512 {times} 480 with 8-bits/pixel black and white and 12/24 bits/pixel color depending on system configuration. Compression is used during various image display and transmission functions to reduce the dynamic range of image data of 12/6/3/2 bits/pixel depending on the application. Image acquisition is accomplished in real-time or near-real-time by special purpose Itex image hardware. As a result all image displays are highly interactive with attention given to subsecond response time. 3 refs., 7 figs.

Rafferty, P.; Hower, L.

1990-01-01T23:59:59.000Z

432

Parallel Breadth-First Search on Distributed Memory Systems  

SciTech Connect (OSTI)

Data-intensive, graph-based computations are pervasive in several scientific applications, and are known to to be quite challenging to implement on distributed memory systems. In this work, we explore the design space of parallel algorithms for Breadth-First Search (BFS), a key subroutine in several graph algorithms. We present two highly-tuned par- allel approaches for BFS on large parallel systems: a level-synchronous strategy that relies on a simple vertex-based partitioning of the graph, and a two-dimensional sparse matrix- partitioning-based approach that mitigates parallel commu- nication overhead. For both approaches, we also present hybrid versions with intra-node multithreading. Our novel hybrid two-dimensional algorithm reduces communication times by up to a factor of 3.5, relative to a common vertex based approach. Our experimental study identifies execu- tion regimes in which these approaches will be competitive, and we demonstrate extremely high performance on lead- ing distributed-memory parallel systems. For instance, for a 40,000-core parallel execution on Hopper, an AMD Magny- Cours based system, we achieve a BFS performance rate of 17.8 billion edge visits per second on an undirected graph of 4.3 billion vertices and 68.7 billion edges with skewed degree distribution.

Computational Research Division; Buluc, Aydin; Madduri, Kamesh

2011-04-15T23:59:59.000Z

433

Lessons learned in modeling Underfloor Air Distribution system  

E-Print Network [OSTI]

Underfloor Air Distribution (UFAD) Design Guide. Atlanta:for design cooling loads in underfloor air distribution (

Lee, Kwang Ho; Schiavon, Stefano; Webster, Tom; Bauman, Fred; Feng, Jingjuan; Hoyt, Tyler

2011-01-01T23:59:59.000Z

434

Towards reliable nanoelectronic systems  

E-Print Network [OSTI]

to the left. The generator matrix of a linear block code ona linear block code generated by a systematic generatorlinear block code consists of multiplying a dataword vector with the generator

Rao, Wenjing

2008-01-01T23:59:59.000Z

435

OE's Smart Grid Activities in the Distribution System  

Broader source: Energy.gov (indexed) [DOE]

1/2013 1 1/2013 1 National Academy of Engineering - BMED December 2008 www.oe.energy.gov U.S. Department of Energy - 1000 Independence Ave., SW Washington, DC 20585 OE's Smart Grid Activities in the Distribution system September 2012 Patricia Hoffman Assistant Secretary December 2008 Mission  Drive Grid Modernization and Resiliency in the Energy Infrastructure  The formation of the Grid Technology Team is a recognition by DOE that we need to bring more resources to bear on grid modernization, coordinating effort from the Science programs, ARPA-E, and the other applied programs 2 December 2008 Desired Outcomes from this Workshop  Better shared understanding of the technology needs of the Distribution system  Identification of gaps in current research

436

Compiling software for a hierarchical distributed processing system  

DOE Patents [OSTI]

Compiling software for a hierarchical distributed processing system including providing to one or more compiling nodes software to be compiled, wherein at least a portion of the software to be compiled is to be executed by one or more nodes; compiling, by the compiling node, the software; maintaining, by the compiling node, any compiled software to be executed on the compiling node; selecting, by the compiling node, one or more nodes in a next tier of the hierarchy of the distributed processing system in dependence upon whether any compiled software is for the selected node or the selected node's descendents; sending to the selected node only the compiled software to be executed by the selected node or selected node's descendent.

Archer, Charles J; Blocksome, Michael A; Ratterman, Joseph D; Smith, Brian E

2013-12-31T23:59:59.000Z

437

Valuing time and reliability: assessing the evidence from road pricing demonstrations  

E-Print Network [OSTI]

distribution of motorists’ preferences for travel time and reliability:time and reliability as preferences about this distribution.reliability can be fruitfully modeled as a property of the upper tail of the travel-time distribution

Brownstone, David; Small, K A

2005-01-01T23:59:59.000Z

438

Using Active Customer Participation in Managing Distribution Systems  

E-Print Network [OSTI]

;Impact AnalysisUtility Cost Benefit Analysis Consumer Participation DSM Objectives Load Shape Request] Department of Energy, Online: http://energy.gov/oe/technology-development/smart-grid #12;Current State 5 Gen at feeder/lateral level o IEEE 13 bus system o Distributed solar PV at 40% penetration 0.0 0.2 0.4 0.6 0.8 1

Van Veen, Barry D.

439

Evaluation of the application uniformity of subsurface drip distribution systems  

E-Print Network [OSTI]

. .......................................................................................13 Table 3. Recommended acid concentration to treat water (Netafim, 2000a)................15 Table 4. Methods of comparison of statistical uniformity (ASAE, 1999). ...................19 Table 5. Evaluation of type Y emitter flow rates... is This thesis is written to conform to the style of Transactions of the ASAE. 2 essential for proper treatment of wastewater. Subsurface drip distribution systems can be used in these areas, but the effects of different site conditions and drip emitter...

Weynand, Vance Leo

2004-09-30T23:59:59.000Z

440

Acceleration of dormant storage effects to address the reliability of silicon surface micromachined Micro-Electro-Mechanical Systems (MEMS).  

SciTech Connect (OSTI)

Qualification of microsystems for weapon applications is critically dependent on our ability to build confidence in their performance, by predicting the evolution of their behavior over time in the stockpile. The objective of this work was to accelerate aging mechanisms operative in surface micromachined silicon microelectromechanical systems (MEMS) with contacting surfaces that are stored for many years prior to use, to determine the effects of aging on reliability, and relate those effects to changes in the behavior of interfaces. Hence the main focus was on 'dormant' storage effects on the reliability of devices having mechanical contacts, the first time they must move. A large number ({approx}1000) of modules containing prototype devices and diagnostic structures were packaged using the best available processes for simple electromechanical devices. The packaging processes evolved during the project to better protect surfaces from exposure to contaminants and water vapor. Packages were subjected to accelerated aging and stress tests to explore dormancy and operational environment effects on reliability and performance. Functional tests and quantitative measurements of adhesion and friction demonstrated that the main failure mechanism during dormant storage is change in adhesion and friction, precipitated by loss of the fluorinated monolayer applied after fabrication. The data indicate that damage to the monolayer can occur at water vapor concentrations as low as 500 ppm inside the package. The most common type of failure was attributed to surfaces that were in direct contact during aging. The application of quantitative methods for monolayer lubricant analysis showed that even though the coverage of vapor-deposited monolayers is generally very uniform, even on hidden surfaces, locations of intimate contact can be significantly depleted in initial concentration of lubricating molecules. These areas represent defects in the film prone to adsorption of water or contaminants that can cause movable structures to adhere. These analysis methods also indicated significant variability in the coverage of lubricating molecules from one coating process to another, even for identical processing conditions. The variability was due to residual molecules left in the deposition chamber after incomplete cleaning. The coating process was modified to result in improved uniformity and total coverage. Still, a direct correlation was found between the resulting static friction behavior of MEMS interfaces, and the absolute monolayer coverage. While experimental results indicated that many devices would fail to start after aging, the modeling approach used here predicted that all the devices should start. Adhesion modeling based upon values of adhesion energy from cantilever beams is therefore inadequate. Material deposition that bridged gaps was observed in some devices, and potentially inhibits start-up more than the adhesion model indicates. Advances were made in our ability to model MEMS devices, but additional combined experimental-modeling studies will be needed to advance the work to a point of providing predictive capability. The methodology developed here should prove useful in future assessments of device aging, however. Namely, it consisted of measuring interface properties, determining how they change with time, developing a model of device behavior incorporating interface behavior, and then using the age-aware interface behavior model to predict device function.

Cox, James V.; Candelaria, Sam A.; Dugger, Michael Thomas; Duesterhaus, Michelle Ann; Tanner, Danelle Mary; Timpe, Shannon J.; Ohlhausen, James Anthony; Skousen, Troy J.; Jenkins, Mark W.; Jokiel, Bernhard, Jr.; Walraven, Jeremy Allen; Parson, Ted Blair

2006-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "distribution system reliability" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

A new approach to power quality and electricity reliability monitoring-case study illustrations of the capabilities of the I-GridTM system  

SciTech Connect (OSTI)

This report describes a new approach for collecting information on power quality and reliability and making it available in the public domain. Making this information readily available in a form that is meaningful to electricity consumers is necessary for enabling more informed private and public decisions regarding electricity reliability. The system dramatically reduces the cost (and expertise) needed for customers to obtain information on the most significant power quality events, called voltage sags and interruptions. The system also offers widespread access to information on power quality collected from multiple sites and the potential for capturing information on the impacts of power quality problems, together enabling a wide variety of analysis and benchmarking to improve system reliability. Six case studies demonstrate selected functionality and capabilities of the system, including: Linking measured power quality events to process interruption and downtime; Demonstrating the ability to correlate events recorded by multiple monitors to narrow and confirm the causes of power quality events; and Benchmarking power quality and reliability on a firm and regional basis.

Divan, Deepak; Brumsickle, William; Eto, Joseph

2003-04-01T23:59:59.000Z

442

Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation  

SciTech Connect (OSTI)

This report summarizes the work performed by Honeywell during the January 2002 to March 2002 reporting period under Cooperative Agreement DE-FC26-01NT40779 for the U. S. Department of Energy, National Energy Technology Laboratory (DOE/NETL) entitled ''Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation''. The main objective of this project is to develop and demonstrate the feasibility of a highly efficient hybrid system integrating a planar Solid Oxide Fuel Cell (SOFC) and a turbogenerator. For this reporting period the following activities have been carried out: {lg_bullet} Conceptual system design trade studies were performed {lg_bullet} System-level performance model was created {lg_bullet} Dynamic control models are being developed {lg_bullet} Mechanical properties of candidate heat exchanger materials were investigated {lg_bullet} SOFC performance mapping as a function of flow rate and pressure was completed

Nguyen Minh

2002-03-31T23:59:59.000Z

443

Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation  

SciTech Connect (OSTI)

This report summarizes the work performed by Hybrid Power Generation Systems, LLC (HPGS) during the July 2003 to December 2003 reporting period under Cooperative Agreement DE-FC26-01NT40779 for the U. S. Department of Energy, National Energy Technology Laboratory (DOE/NETL) entitled ''Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation''. The main objective of this project is to develop and demonstrate the feasibility of a highly efficient hybrid system integrating a planar Solid Oxide Fuel Cell (SOFC) and a micro-turbine. In addition, an activity included in this program focuses on the development of an integrated coal gasification fuel cell system concept based on planar SOFC technology. Also, another activity included in this program focuses on the development of SOFC scale up strategies.

Faress Rahman; Nguyen Minh

2004-01-04T23:59:59.000Z

444

NREL: Gearbox Reliability Collaborative - Gearbox Reliability Collaborative  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Publications Publications Screenshot of the cover of an NREL report, titled Gearbox Reliability Collaborative Project Report: Findings from Phase 1 and Phase 2 testing. The NREL wind research program's Gearbox Reliability Collaborative publishes reports and presentations of its activities. General Gearbox Reliability Collaborative Phase 3 Gearbox 2 Test Plan 2013 DOE/NREL Gearbox Reliability Collaborative: All Members Meeting Agenda 2012 Gearbox Reliability Collaborative Phase 1 and 2: Testing and Modeling Results 2012 Gearbox Reliability Collaborative Update: A Brief (Presentation) Jan 2012 Gearbox Reliability Collaborative Update (Presentation) April 2012 NREL Collaborates to Improve Wind Turbine Technology (Fact Sheet) 2012 Gearbox Reliability Collaborative - Phase 1 and 2 Overview

445

IEEE TRANSACTIONS ON RELIABILITY, VOL. 42, NO. 4, 1993 DECEMBER 641 Bayes Estimation of the Extreme-Value Reliability Function  

E-Print Network [OSTI]

& Conclusions-This paper obtainsBayesestimates of the reliability function of the extreme value distribution referred to as the Gumbel distribution, is widely used in reliability and life testing. This distribution estimatesof the reliability func- tion of the EV1 distribution using two well known Bayes ap- proximation

446

Reliability-based optimization using evolutionary algorithms  

Science Journals Connector (OSTI)

Uncertainties in design variables and problem parameters are often inevitable and must be considered in an optimization task if reliable optimal solutions are sought. Besides a number of sampling techniques, there exist several mathematical approximations ... Keywords: Ditlevsen's bound, Pareto-optimal front, evolutionary multiobjective optimization, most probable point, reliability-based optimization, reliable front, system reliability

Kalyanmoy Deb; Shubham Gupta; David Daum; Jürgen Branke; Abhishek Kumar Mall; Dhanesh Padmanabhan

2009-10-01T23:59:59.000Z

447

Distributed embedded computing systems are special-purpose computer systems designed for particular applications and set up in a networked or distributed manner. A  

E-Print Network [OSTI]

ABSTRACT Distributed embedded computing systems are special-purpose computer systems designed). Therefore, this thesis presents a design methodology for distributing DSP applica- tions across wireless-power, application-specific sensor node platform for distributed WSN sys- tems is designed and demonstrated

Bhattacharyya, Shuvra S.

448

Software-Based Challenges of Developing the Future Distribution Grid  

E-Print Network [OSTI]

distribution  grid  can  provide  vital  information  for   reliability  distribution  grid   loads  in  order  to  ensure  grid  reliability.  

Stewart, Emma

2014-01-01T23:59:59.000Z

449

SOLID OXIDE FUEL CELL HYBRID SYSTEM FOR DISTRIBUTED POWER GENERATION  

SciTech Connect (OSTI)

This report summarizes the work performed by Honeywell during the July 2001 to September 2001 reporting period under Cooperative Agreement DE-FC26-01NT40779 for the U. S. Department of Energy, National Energy Technology Laboratory (DOE/NETL) entitled ''Solid Oxide Fuel Cell Hybrid System for Distributed Power Generation''. The main objective of this project is to develop and demonstrate the feasibility of a highly efficient hybrid system integrating a planar Solid Oxide Fuel Cell (SOFC) and a turbogenerator. An internal program kickoff was held at Honeywell in Torrance, CA. The program structure was outlined and the overall technical approach for the program was presented to the team members. Detail program schedules were developed and detailed objectives were defined. Initial work has begun on the system design and pressurized SOFC operation.

Unknown

2002-03-01T23:59:59.000Z

450

SAFETY AND RELIABILITY ANALYSIS OF NUCLEAR REACTORS  

Science Journals Connector (OSTI)

Abstract A survey of the various aspects of safety and reliability analysis of nuclear reactors is presented with particular emphasis on the interrelation between structural reliability and systems reliability. In reactor design this interrelation is of overriding importance since it is the task of the control, protective and containment systems to protect the mechanical system and the structure from accidental overloading.

T.A. JAEGER

1972-01-01T23:59:59.000Z

451

A comprehensive power loss, efficiency, reliability and cost calculation of a 1 MW/500 kWh battery based energy storage system for frequency regulation application  

Science Journals Connector (OSTI)

Abstract Battery based energy storage system (ESS) has tremendous diversity of application with an intense focus on frequency regulation market. An ESS typically comprised of a battery and a power conversion system. A calculation of performance parameters is performed in this research. The aim is to formulate an in-depth analysis of the ESS in terms of power losses of the semiconductor and electrical devices, efficiency, reliability and cost which would foster various research groups and industries around the globe to improve their future product. In view of this, a relation between the operating conditions and power losses is established to evaluate the efficiency of the system. The power loss calculation presented in this paper has taken into account the conduction and switching losses of the semiconductor devices. Afterwards, the Arrhenius Life Stress relation is adopted to calculate the reliability of the system by considering temperature as a covariate. And finally, a cost calculation is executed and presented as a percentage of total cost of the ESS. It has been found that the power loss and efficiency of the ESS at rated power is 146 kW and 85% respectively. Furthermore, the mean time between failures of the ESS is 8 years and reliability remains at 73% after a year. The major cost impact observed is for battery and PCS as 58% and 16% respectively. Finally, it has been determined that further research is necessary for higher efficient and lower cost system for high penetration of energy storage system in the market.

Md Arifujjaman

2015-01-01T23:59:59.000Z

452

Chapter Three - Pipeline Reliability Assessment  

Science Journals Connector (OSTI)

Abstract Another aspect of pipeline integrity management is the assessment of system reliability over the age of the pipeline. In order to assess the aging effects through the pipe’s lifetime, a reliability assessment is carried out for the pipeline or its segment. The assessment of the residual stress effect is carried out by evaluating the reliability of new uncorroded pipelines, which are assumed to be free from any flaw. The influence of residual stress parameters, mean, and coefficient of variation are considered in the reliability assessment.

Ramesh Singh

2014-01-01T23:59:59.000Z

453

Transmission Reliability | Department of Energy  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Transmission Reliability Transmission Reliability Transmission Reliability Modernizing America's electricity infrastructure is one of the U.S. Department of Energy's top priorities. The DOE Strategic Plan states that today's electric grid needs to be more efficient, reliable, and secure. A modern, smarter electric grid may save consumers money, help our economy run more efficiently, allow rapid growth in renewable energy sources, and enhance energy reliability. The Department's research into a variety of tools that will improve advanced system monitoring, visualization, control, operations, and market structure will ultimately modernize the electricity transmission infrastructure to ease congestion, allow for increases in demand, and provide a greater degree of security. The Transmission Reliability Program is aligned with this strategic plan

454

Depositional systems distribution of the lower Oligocene Vicksburg Formation, TX  

SciTech Connect (OSTI)

The lower Oligocene Vicksburg Formation of Texas is situated between the upper Eocene Jackson Group and the upper Oligocene Frio Formation. The paleogeography of the Texas Gulf coastal plain during the early Oligocene is typical of a progradational passive continental margin. However, a detailed regional depositional systems analysis of stratigraphic units, such as the Vicksburg, within a mature petroleum basin can yield results beneficial in both exploration and development. Stratigraphic plays are determined from the distribution of depositional systems, and reservoir characteristics are heavily influenced by conditions of sedimentation. Two primary depocenters (and exploration fairways) of the Texas Vicksburg were the Houston Embayment and the Rio Grande Embayment; they were separated by a deep-rooted structural nose in central Texas: the San Marcos arch. Within the embayments, deltaic depositional systems merged along strike with barrier/strand plain systems. Updip, fluvial systems traversed coastal plain units. On the seaward edge of the paralic systems, sand and mud deposits prograded across, and built up over, the relict Jackson shelf and shelf margin. Contemporaneous growth faulting controlled deltaic depositional patterns in the Rio Grande Embayment and, to a lesser degree, in the Houston Embayment. A barrier/strand plain system within an interdeltaic coastal bight extended across the northern flank of the San Marcos arch. Several minor wave-dominated delta complexes were interspersed within this regional setting. The southern flank of the arch was influenced by the fluvial systems of the Rio Grande Embayment that established another wave-dominated delta. Deposition of the Vicksburg progradational paralic sediments was initiated seaward of the Jackson coastal position. A brief, minor transgression interrupted the progradational pattern during middle Vicksburg deposition.

Coleman, J.; Galloway, W.E. (Univ. of Texas, Austin (USA))

1990-05-01T23:59:59.000Z

455

Solid-state current limiter for power distribution system  

SciTech Connect (OSTI)

To prevent voltage decrease of distribution systems, the principle and fundamental characteristics of a solid-state current limiter using GTO thyristors were investigated. Basic components of the apparatus were a fast solid-state switch and a current limiting impedance of low resistance in parallel with the switch. Experimental results of the test current limiter showed the fault current was limited successfully, regardless of DC component size. The time from detection of fault current was limited successfully, regardless of DC component size. The time from detection of fault occurrence to interruption of the fault current by the solid-state switch was 40 [mu]s. This time was very short in comparison with that before the fault current reached a large value. Thermal rise of the solid-state switch for conduction was solved by a self-cooling apparatus using a non-combustible cooling liquid. The results indicated that the solid-state current limiter was a valuable protecting device for high fault current distribution systems.

Ueda, T.; Morita, M. (Chubu Electric Power Co. Inc., Nagoya (Japan)); Arita, H.; Kida, J.; Kurosawa, Y.; Yamagiwa, T. (Hitachi Ltd., Ibaraki (Japan). Hitachi Research Lab.)

1993-10-01T23:59:59.000Z

456

A Microkernel Middleware Architecture for Distributed Embedded Real-Time Systems  

E-Print Network [OSTI]

microcontrollers and (ii) development of a permanent monitoring distributed system for an oil drilling application control embedded distributed system for oil drilling application.. A comparison of the OSA+ approach

Ungerer, Theo

457

A new HBMO algorithm for multiobjective daily Volt/Var control in distribution systems considering Distributed Generators  

Science Journals Connector (OSTI)

In recent years, Distributed Generators (DGs) connected to the distribution network have received increasing attention. The connection of enormous \\{DGs\\} into existing distribution network changes the operation of distribution systems. Because of the small X/R ratio and radial structure of distribution systems, \\{DGs\\} affect the daily Volt/Var control. This paper presents a new algorithm for multiobjective daily Volt/Var control in distribution systems including Distributed Generators (DGs). The objectives are costs of energy generation by \\{DGs\\} and distribution companies, electrical energy losses and the voltage deviations for the next day. A new optimization algorithm based on a Chaotic Improved Honey Bee Mating Optimization (CIHBMO) is proposed to determine the active power values of DGs, reactive power values of capacitors and tap positions of transformers for the next day. Since objectives are not the same, a fuzzy system is used to calculate the best solution. The plausibility of the proposed algorithm is demonstrated and its performance is compared with other methods on a 69-bus distribution feeder. Simulation results illustrate that the proposed algorithm has better outperforms the other algorithms.

Taher Niknam

2011-01-01T23:59:59.000Z

458

Effect of Heat and Electricity Storage and Reliability on Microgrid  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Effect of Heat and Electricity Storage and Reliability on Microgrid Effect of Heat and Electricity Storage and Reliability on Microgrid Viability: A Study of Commercial Buildings in California and New York States Title Effect of Heat and Electricity Storage and Reliability on Microgrid Viability: A Study of Commercial Buildings in California and New York States Publication Type Report Year of Publication 2009 Authors Stadler, Michael, Chris Marnay, Afzal S. Siddiqui, Judy Lai, Brian Coffey, and Hirohisa Aki Pagination 106 Date Published 03/2006 Publisher LBNL City Berkeley Keywords consortium for electric reliability technology solutions (certs), energy analysis and environmental impacts department Abstract Berkeley Lab has for several years been developing methods for selection of optimal microgrid systems, especially for commercial building applications, and applying these methods in the Distributed Energy Resources Customer Adoption Model (DER-CAM). This project began with 3 major goals:

459

Systems Management with Distributed Objects: Porting SNMP Agents to a CORBA Environment  

E-Print Network [OSTI]

Systems Management with Distributed Objects: Porting SNMP Agents to a CORBA Environment NM M TEAM the management of these systems in an efficient manner. Currently, this is not the case: while no such CORBA. Keywords: CORBA, Distributed Objects, Distributed Systems Management, Middleware 1 Introduction

460

Subsystem Interaction Analysis in Power Distribution Systems of Next Generation Airlifters  

E-Print Network [OSTI]

1 Subsystem Interaction Analysis in Power Distribution Systems of Next Generation Airlifters Sriram power distribution system of a next generation transport aircraft is addressed. Detailed analysis with the analysis of subsystem integration in power distribution systems of next generation transport aircraft

Lindner, Douglas K.

Note: This page contains sample records for the topic "distribution system reliability" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Reliability Considerations from Integration of Smart Grid  

Broader source: Energy.gov (indexed) [DOE]

Considerations Considerations from the Integration of Smart Grid 116-390 Village Blvd., Princeton, NJ 08540 609.452.8060 | 609.452.9550 fax www.nerc.com the reliability of the to ensure bulk power system December 2010 (This page intentionally left blank) to ensure the reliability of the bulk power system Reliability Considerations of Integration of Smart Grid i

462

Time-cost analysis of a quantum key distribution system clocked at 100 MHz  

Science Journals Connector (OSTI)

We describe the realization of a quantum key distribution (QKD) system clocked at 100 MHz. The system includes classical postprocessing implemented via software, and is operated over a...

Mo, X F; Lucio-Martinez, I; Chan, P; Healey, C; Hosier, S; Tittel, W

2011-01-01T23:59:59.000Z

463

Modelling in industrial maintenance and reliability  

Science Journals Connector (OSTI)

......of modelling the reliability of wind turbines and some critical subsystems from...change, through the years, in wind turbines reliability. There were major...research on determining optimal maintenance policies for deteriorating systems......

Wenbin Wang

2010-10-01T23:59:59.000Z

464

Cogeneration and Distributed Generation1 This appendix describes cogeneration and distributed generating resources. Also provided is an  

E-Print Network [OSTI]

reinforcement, remote loads more economically served by small-scale generation than by distribution system. · Reliability upgrade for systems susceptible to outages. · Alternative to the expansion of transmission

465

Distribution System Voltage Performance Analysis for High-Penetration Photovoltaics  

SciTech Connect (OSTI)

This report examines the performance of commonly used distribution voltage regulation methods under reverse power flow.

Liu, E.; Bebic, J.

2008-02-01T23:59:59.000Z

466

Enhancement of loading capacity of distribution system through distributed generator placement considering techno-economic benefits with load growth  

Science Journals Connector (OSTI)

Abstract Load growth in a system is a natural phenomenon. With the increase in load demand, system power loss and voltage drop increases. Distributed generators (DGs) are one of the best solutions to cope up with the load growth if they are allocated appropriately in the distribution system. In this work, optimal size and location of multiple \\{DGs\\} are found to cater the incremental load on the system and minimization of power loss without violating system constraints. For this a predetermined annual load growth up to five years is considered with voltage regulation as a constraint. The particle swarm optimization with constriction factor approach is applied to determine the optimum size and location with multiple DGs. To see the effect of load growth on system, 33-node IEEE standard test case is considered. It is observed that with the penetration of multiple number of \\{DGs\\} in distribution system, there is great improvement in several distribution system parameters. Moreover, the loading capacity of distribution system is enhanced through DG placement and its techno-economic benefits are also established.

Khyati D. Mistry; Ranjit Roy

2014-01-01T23:59:59.000Z

467

An autonomy-oriented computing mechanism for modeling the formation of energy distribution networks: crude oil distribution in U.S. and Canada  

Science Journals Connector (OSTI)

An efficient, economical, as well as reliable energy distribution system plays important roles in distributing energy resources from energy suppliers to energy consumers in different regions. In this paper, we present a decentralized self-organized mechanism ...

Benyun Shi; Jiming Liu

2010-09-01T23:59:59.000Z

468

2012 SG Peer Review - Real-Time Distribution Feed Performance Monitoring, Advisory Control, and Health Management System - James Stoupis, ABB Inc.  

Broader source: Energy.gov (indexed) [DOE]

Real-Time Distribution Feeder Performance Real-Time Distribution Feeder Performance Monitoring, Advisory Control, and Health Management System James Stoupis ABB Inc., US Corporate Research Center June 7, 2012 December 2008 Real-Time Distribution Feeder Performance Monitoring Objective Life-cycle Funding Summary ($K) Prior to FY 12 FY12, authorized FY13, requested Out-year(s) $200 k $1.1 M $1.3 M $400k Technical Scope To innovatively leverage advanced sensing, monitoring, and control technologies to enhance asset utilization and grid reliability Install state-of-the-art data collection, monitoring, and sensing equipment in distribution substations and on distribution feeders Develop new feeder monitoring, advisory control, and asset health applications deployed on current circuits, and future circuits with DERs

469

Distributed Generation Systems Inc DISGEN | Open Energy Information  

Open Energy Info (EERE)

DISGEN DISGEN Jump to: navigation, search Name Distributed Generation Systems Inc (DISGEN) Place Lakewood, Colorado Zip 80228 Sector Wind energy Product Developer of Green Mountain (10.4 MW) and Ponnequin (16 MW) wind generation projects in the US. Manages everything from site selection through construction. Coordinates 45.300538°, -88.522572° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":45.300538,"lon":-88.522572,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

470

CEMS (continuous emission monitoring systems) pilot project: evaluation of opacity CEMS reliability and QA (quality assurance) procedures. Volume 1  

SciTech Connect (OSTI)

A study was conducted in Missouri to evaluate the reliability of opacity-monitoring data and to facilitate the development and evaluation of QA procedures for opacity CEMS's. The study included opacity CEMS's installed on six coal-fired electric utility generating units at four generating stations, each owned by a different company. The sources were representative of a wide range of monitoring applications and conditions, and were equipped with contemporary opacity monitoring instrumentation. For each station, monitor- and source-specific opacity CEMS QA procedures were developed and CEMS audits were conducted at the beginning of the study. Plant personnel implemented and revised the QA procedures and conducted a performance audit during a 6- to 8-month period. Performance audits were also conducted at the end of the study. The report presents evaluations both of opacity CEMS reliability (i.e., accuracy, precision, and availability) and of the QA procedures that were used in the study. In summary, appropriate and effective QA procedures can be developed and implemented for a variety of opacity monitoring equipment and applications without imposing an undue burden on the monitor operators. Such procedures are inherently source- and monitor-specific. Reliable opacity monitoring data are obtained when appropriate QA procedures are implemented.

Peeler, J.W.

1986-05-01T23:59:59.000Z

471

Impact of Utility-Scale Distributed Wind on Transmission-Level System Operations  

SciTech Connect (OSTI)

This report presents a new renewable integration study that aims to assess the potential for adding distributed wind to the current power system with minimal or no upgrades to the distribution or transmission electricity systems. It investigates the impacts of integrating large amounts of utility-scale distributed wind power on bulk system operations by performing a case study on the power system of the Independent System Operator-New England (ISO-NE).

Brancucci Martinez-Anido, C.; Hodge, B. M.

2014-09-01T23:59:59.000Z

472

Abstract--Multimedia groupware systems provide rich support for distributed team work. Yet effective design of these systems is  

E-Print Network [OSTI]

evolve design ideas. The problem is that multimedia groupware is hard to prototype because distributed that inform the design of universally accepted toolkits for building distributed multimedia systems: we1 Abstract--Multimedia groupware systems provide rich support for distributed team work. Yet

Greenberg, Saul

473

ALBL: an adaptive load balancing algorithm for distributed web systems  

Science Journals Connector (OSTI)

This paper presents an adaptive load balancing algorithm (ALBL) for cluster-based web systems. The balancing policy is based on two criteria: HTTP process time and network delay. The former describes web server ability to process a forthcoming request, while the latter tries to estimate network conditions. Periodic criteria calculations are performed by agents at the web switch and the weight estimation process is transparent to web servers enhancing therefore distributed system's scalability. We put to test our implementation against known blind selection balancing algorithms used at web-farms such as: Round Robin, stateful ones such as Least Connections and adaptive ones such as Least Load. We also put to test performance and scalability of previous algorithms. From our testbed scenario results we show that ALBL algorithm outperforms stateless and stateful algorithms and also presents significant performance gains towards adaptive algorithms. We also show that our algorithm scales well as the number of balancing servers and web cluster's requests rate increases. We also pinpoint ALBL algorithm ability to predict network conditions and web servers load without the use of feedback information obtained by web servers but frequent service and network probes towards web servers issued by the web switch.

Sotirios Kontogiannis; Alexandros Karakos

2014-01-01T23:59:59.000Z

474

Cybersecurity through Real-Time Distributed Control Systems  

SciTech Connect (OSTI)

Critical infrastructure sites and facilities are becoming increasingly dependent on interconnected physical and cyber-based real-time distributed control systems (RTDCSs). A mounting cybersecurity threat results from the nature of these ubiquitous and sometimes unrestrained communications interconnections. Much work is under way in numerous organizations to characterize the cyber threat, determine means to minimize risk, and develop mitigation strategies to address potential consequences. While it seems natural that a simple application of cyber-protection methods derived from corporate business information technology (IT) domain would lead to an acceptable solution, the reality is that the characteristics of RTDCSs make many of those methods inadequate and unsatisfactory or even harmful. A solution lies in developing a defense-in-depth approach that ranges from protection at communications interconnect levels ultimately to the control system s functional characteristics that are designed to maintain control in the face of malicious intrusion. This paper summarizes the nature of RTDCSs from a cybersecurity perspec tive and discusses issues, vulnerabilities, candidate mitigation approaches, and metrics.

Kisner, Roger A [ORNL; Manges, Wayne W [ORNL; MacIntyre, Lawrence Paul [ORNL; Nutaro, James J [ORNL; Munro Jr, John K [ORNL; Ewing, Paul D [ORNL; Howlader, Mostofa [ORNL; Kuruganti, Phani Teja [ORNL; Wallace, Richard M [ORNL; Olama, Mohammed M [ORNL

2010-04-01T23:59:59.000Z

475

Linac cryogenic distribution system maintenance and upgrades at JLab  

SciTech Connect (OSTI)

The Central Helium Liquefier (CHL) distribution system to the CEBAF and FEL linacs at Jefferson Lab (JLab) experienced a planned warm up during the late summer and fall of 2012 for the first time after its commissioning in 1991. Various maintenance and modifications were performed to support high beam availability to the experimental users, meet 10 CFR 851 requirements for pressure systems, address operational issues, and prepare the cryogenic interfaces for the high-gradient cryomodules needed for the 12 GeV upgrade. Cryogenic maintenance and installation work had to be coordinated with other activities in the linacs and compete for manpower from other department installation activities. With less than a quarter of the gas storage capacity available to handle the boil-off from the more than 40 cryomodules, 35,000 Nm{sup 3} of helium was re-liquefied and shipped to a vendor via a liquid tanker trailer. Nearly 200 u-tubes had to be removed and stored while seals were replaced on related equipment such as vacuum pump outs, bayonet isolation and process valves.

Dixon, K.; Wright, M.; Ganni, V. [Thomas Jefferson National Accelerator Facility (JLab), Newport News, VA 23606 (United States)

2014-01-29T23:59:59.000Z

476

Linac cryogenic distribution system maintenance and upgrades at Jlab  

SciTech Connect (OSTI)

The Central Helium Liquefier (CHL) distribution system to the CEBAF and FEL linacs at Jefferson Lab (JLab) experienced a planned warm up during the late summer and fall of 2012 for the first time after its commissioning in 1991. Various maintenance and modifications were performed to support high beam availability to the experimental users, meet 10 CFR 851 requirements for pressure systems, address operational issues, and prepare the cryogenic interfaces for the high-gradient cryomodules needed for the 12 GeV upgrade. Cryogenic maintenance and installation work had to be coordinated with other activities in the linacs and compete for manpower from other department installation activities. With less than a quarter of the gas storage capacity available to handle the boil-off from the more than 40 cryomodules, 35,000 Nm{sup 3} of helium was re-liquefied and shipped to a vendor via a liquid tanker trailer. Nearly 200 u-tubes had to be removed and stored while seals were replaced on related equipment such as vacuum pump outs, bayonet isolation and process valves.

Dixon, Kelly D. [JLAB; Wright, Mathew C. [JLAB; Ganni, Venkatarao [JLAB

2014-01-01T23:59:59.000Z

477

Distributed Solar PV for Electricity System Resiliency: Policy...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

supply. Members of the community installed a total of 700 kW of distributed rooftop solar capacity. CES units were added at the substation and distribution circuits, along with...

478

Carbon and Water Resource Management for Water Distribution Systems  

E-Print Network [OSTI]

wastewater transmission and sewage treatment. Distribution pumping and sewage treatment were found to contribute the most to climate change

Hendrickson, Thomas Peter

2013-01-01T23:59:59.000Z

479

Power-Aware Autonomous Distributed Storage Systems for Internet Hosting Service Platforms  

E-Print Network [OSTI]

percentage of the total computing system's energy is used by the data storage systems, various attemptsPower-Aware Autonomous Distributed Storage Systems for Internet Hosting Service Platforms Jumpei@osss.,hasebe@,kato@}cs.tsukuba.ac.jp Abstract. We present a power-saving method for large-scale distributed storage systems of Internet hosting

Banbara, Mutsunori

480

Creol: a type-safe object-oriented model for distributed concurrent systems  

Science Journals Connector (OSTI)

Object-oriented distributed computing is becoming increasingly important for critical infrastructure in society. In standard object-oriented models, objects synchronize on method calls. These models may be criticized in the distributed setting for their ... Keywords: distributed object-oriented systems, type and effect system, type soundness

Einar Broch Johnsen; Olaf Owe; Ingrid Chieh Yu

2006-11-01T23:59:59.000Z

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481

Interaction systems design and the protocol-and middleware-centred paradigms in distributed application development  

E-Print Network [OSTI]

Interaction systems design and the protocol- and middleware-centred paradigms in distributed the benefits and importance of interaction systems design in the development of distributed applications. We in the development of distributed applications. Typical design methods based on the re-use of middleware platforms

van Sinderen, Marten

482

A Simple Toy Example of a Distributed System: On the Design of a Connecting Switch  

E-Print Network [OSTI]

A Simple Toy Example of a Distributed System: On the Design of a Connecting Switch Thomas F Munchen 2 (Germany) Abstract In this paper the development life-cycle of a design method for distributed the design method more transparent. 1. Introduction A distributed system consists of a family of components

483

Distributed Solar PV for Electricity System Resiliency: Policy and Regulatory Considerations (Brochure)  

SciTech Connect (OSTI)

Distributed Solar PV systems have the potential of increasing the grid's resiliency to unforeseen events, such as extreme weather events and attacks. This paper presents the role that distributed PV can play in electric grid resiliency, introduces basic system design requirements and options, and discusses the regulatory and policy options for supporting the use of distributed PV for the purpose of increased electricity resiliency.

Not Available

2014-11-01T23:59:59.000Z

484

2013 Reliability & Markets Peer Review - Day 2 Presentations...  

Broader source: Energy.gov (indexed) [DOE]

Review - The Nexus of System Reliability, Energy Costs, and the Environment During High Energy Demand Days - Max Zhang, Cornell More Documents & Publications 2012 Reliability &...

485

Reliability Evaluation of Substations Subject to Protection Failures:.  

E-Print Network [OSTI]

??Reliability evaluation of power system substations is of significant importance when performing asset management. Most of the studies about substation reliability only focus on the… (more)

Wang, F.

2012-01-01T23:59:59.000Z

486

Methods of estimating the reliability of nuclear reactor installations  

Science Journals Connector (OSTI)

Domestic and foreign experience indicate that quantitative analysis of the reliability of reactor systems during their development is a rather effective means of increasing their reliability.

I. Ya. Emel'yanov; A. I. Klemin; E. F. Polyakov

1974-11-01T23:59:59.000Z

487

Travel Time Reliability: Its Measurement and Prediction | ornl...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

reliability can help agencies understand the performance of their systems and monitor how reliability improves over time. It equips them to answer questions like: What is the...

488

Low-Cost Hydrogen Distributed Production System Development  

SciTech Connect (OSTI)

H{sub 2}Gen, with the support of the Department of Energy, successfully designed, built and field-tested two steam methane reformers with 578 kg/day capacity, which has now become a standard commercial product serving customers in the specialty metals and PV manufacturing businesses. We demonstrated that this reformer/PSA system, when combined with compression, storage and dispensing (CSD) equipment could produce hydrogen that is already cost-competitive with gasoline per mile driven in a conventional (non-hybrid) vehicle. We further showed that mass producing this 578 kg/day system in quantities of just 100 units would reduce hydrogen cost per mile approximately 13% below the cost of untaxed gasoline per mile used in a hybrid electric vehicle. If mass produced in quantities of 500 units, hyd