Optimal Demand Response and Power Flow
Willett, Rebecca
Optimal Demand Response and Power Flow Steven Low Computing + Math Sciences Electrical Engineering #12;Outline Optimal demand response n With L. Chen, L. Jiang, N. Li Optimal power flow n With S. Bose;Optimal demand response Model Results n Uncorrelated demand: distributed alg n Correlated demand
Optimal Power Flow Based Demand Response Offer Price Optimization
Lavaei, Javad
Optimal Power Flow Based Demand Response Offer Price Optimization Zhen Qiu 1 Introduction-time energy balance. Demand response programs are offered by the utility companies to reduce the load response cost in exchange for load reduction. A considerable amount of papers have discussed the demand
Global Optimization of Optimal Power Flow
Grossmann, Ignacio E.
Multi-Period OPF `Smart Grid' · Transmission short falls due to Fluctuating demands. Integrating/03/2013 2 AC-OPF definition · Given: Topology of the power grid: generators, loads, power lines. · Objective: Find operating points for generators, (PG,QG) Minimizing cost of generation f(PG) · Satisfy
Distributed Algorithms for Optimal Power Flow Problem
Lam, Albert Y S; Tse, David
2011-01-01
Optimal power flow (OPF) is an important problem for power generation and it is in general non-convex. With the employment of renewable energy, it will be desirable if OPF can be solved very efficiently so its solution can be used in real time. With some special network structure, e.g. trees, the problem has been shown to have a zero duality gap and the convex dual problem yields the optimal solution. In this paper, we propose a primal and a dual algorithm to coordinate the smaller subproblems decomposed from the convexified OPF. We can arrange the subproblems to be solved sequentially and cumulatively in a central node or solved in parallel in distributed nodes. We test the algorithms on IEEE radial distribution test feeders, some random tree-structured networks, and the IEEE transmission system benchmarks. Simulation results show that the computation time can be improved dramatically with our algorithms over the centralized approach of solving the problem without decomposition, especially in tree-structured...
Optimal power flow in microgrids using event-triggered optimization Pu Wan and Michael D. Lemmon
Lemmon, Michael
Optimal power flow in microgrids using event-triggered optimization Pu Wan and Michael D. Lemmon Abstract-- Microgrids are power generation and distribution systems in which users and generators-triggered distributed optimization algorithm to solve the optimal power flow (OPF) problem in microgrids. Under event
DC Optimal Power Flow: Uniqueness and Chee Wei Tan
Tan, Chee Wei
the minimization of power transmission loss in DC-OPF and char- acterize the uniqueness of its solutions. This hasDC Optimal Power Flow: Uniqueness and Algorithms Chee Wei TanÝ , Desmond W. H. Cai£ and Xin LouÝ Ý and transmission loss in a power net- work subject to physical constraints governed by Kirchhoff's and Ohm's law [1
Thermal Unit Commitment Including Optimal AC Power Flow Constraints
Thermal Unit Commitment Including Optimal AC Power Flow Constraints Carlos Murillo{Sanchez Robert J algorithm for unit commitment that employs a Lagrange relaxation technique with a new augmentation. This framework allows the possibility of committing units that are required for the VArs that they can produce
Resistive Network Optimal Power Flow: Uniqueness and Algorithms
Tan, CW; Cai, DWH; Lou, X
2015-01-01
The optimal power flow (OPF) problem minimizes the power loss in an electrical network by optimizing the voltage and power delivered at the network buses, and is a nonconvex problem that is generally hard to solve. By leveraging a recent development on the zero duality gap of OPF, we propose a second-order cone programming convex relaxation of the resistive network OPF, and study the uniqueness of the optimal solution using differential topology, especially the Poincare-Hopf Index Theorem. We characterize the global uniqueness for different network topologies, e.g., line, radial, and mesh networks. This serves as a starting point to design distributed local algorithms with global behaviors that have low complexity, are computationally fast, and can run under synchronous and asynchronous settings in practical power grids.
Exact Convex Relaxation of Optimal Power Flow in Radial Networks
Gan, LW; Li, N; Topcu, U; Low, SH
2015-01-01
The optimal power flow (OPF) problem determines a network operating point that minimizes a certain objective such as generation cost or power loss. It is nonconvex. We prove that a global optimum of OPF can be obtained by solving a second-order cone program, under a mild condition after shrinking the OPF feasible set slightly, for radial power networks. The condition can be checked a priori, and holds for the IEEE 13, 34, 37, 123-bus networks and two real-world networks.
Optimal Power Flow of Multiple Energy Carriers(Geidl and Andersson...
signal, optimal power flow and economic dispatch The proposed method stabilized the power grid, reduced the marginal cost of electricity, and increased the marginal cost of...
BiogeographyBiogeography--Based OptimizationBased Optimization of Power Flowof Power Flow
Simon, Dan
and phase angle vectors: 60 unknowns #12;7 Power Flow ProblemPower Flow Problem Cost Function = Power / Voltage Mismatch (Ideally = 0) ( ) ( ) ( ){ }2 2 2 min i Q i V i i Gen i PQ i PV P Q V + + V, V, V = - = - - = + - = + - a b #12;12 Simulation GA and BBO Performance ( )cost cost individual, generation, trial= ind trial gen
Wierman, Adam
.g., photovoltaic panels, wind turbines, electric vehicles, electronic appliances, and fuel cells, are easier2892 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 29, NO. 6, NOVEMBER 2014 Optimal Power Flow in Direct Current Networks Lingwen Gan and Steven H. Low, Fellow, IEEE Abstract--The optimal power flow (OPF
Bukhsh, Waqquas Ahmed
2014-07-01
Optimization plays a central role in the control and operation of electricity power networks. In this thesis we focus on two very important optimization problems in power systems. The first is the optimal power flow ...
Optimal Power Flow Formulation in Market of Retail Wheeling Taiyou Yong, Student Member, IEEE distribution in the new retail wheeling market. Formation of optimal power flow (OPF) problem, in which concerns on optimal power flow arise in the retail wheeling market. In the deregulated power system
A Formal Model for Verifying the Impact of Stealthy Attacks on Optimal Power Flow in Power Grids
Wang, Yongge
- mal Power Flow; Formal Model 1. INTRODUCTION Power system control centers employ a numberA Formal Model for Verifying the Impact of Stealthy Attacks on Optimal Power Flow in Power Grids the integrity of OPF and undermine the economic and secure system operation. We present a formal verification
Edinburgh Research Explorer Local solutions of the optimal power flow problem
Millar, Andrew J.
law (KVL), which describes the flow of power in transmission lines, and is a nonlinear function of bus is to find a steady state operating point that minimizes the cost of electric power generation whileEdinburgh Research Explorer Local solutions of the optimal power flow problem Citation
IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 15, NO. 2, MAY 2000 535 Stability-Constrained Optimal Power Flow Deqiang Gan, Member, IEEE, Robert J. Thomas, Fellow, IEEE, and Ray D. Zimmerman, Member, IEEE
1464 IEEE TRANSACTIONS ON SMART GRID, VOL. 4, NO. 3, SEPTEMBER 2013 Distributed Optimal Power Flow
Giannakis, Georgios
--Distributed optimization, distribution feeders, microgrids, optimal power flow, semidefinite relaxation. I. INTRODUCTION MICROGRIDS are portions of a power distribution net- work located downstream of the distribution substation) and energy storage devices [1]. A microgrid can operate in either grid-connected, islanded, or hybrid modes
Distributed Multi-Period Optimal Power Flow for Demand Response in Microgrids
Yeoh, William
Distributed Multi-Period Optimal Power Flow for Demand Response in Microgrids Paul Scott1 direction method of multipliers (ADMM), can be adapted to remain practical in this challenging microgrid discrete decisions. Our experiments on a suburb-sized microgrid show that the AC power flows and a simple
Wierman, Adam
Risk-Mitigated Optimal Power Flow for Wind Powered Grids Emma Sj¨odin, Dennice F. Gayme and Ufuk." High grid penetrations of solar or wind power pose a number of operational challenges and it is widely is the use of large-scale grid-integrated energy storage. The role of energy storage in power systems has
DC Optimal Power Flow Formulation in AMES Leigh Tesfatsion
Tesfatsion, Leigh
wholesale power market testbed. I. AMES TESTBED The latest version of AMES (Agent-based Modeling is measured by the net earnings it secures for itself through the purchase of power in the day- ahead market and the resale of this power to its retail cus- tomers. During the morning of each day D, each LSE j reports
Optimal Power Flow: Closing the Loop over Corrupted Data
Johansson, Karl Henrik
application are the Supervisory Control and Data Acquisition (SCADA) systems. In power networks, the SCADA System. Modern SCADA/EMS systems collect large amounts of measurement data and, using a State Estimator attack. We denote the data corruption by a. cyber attacks on SCADA/EMS systems operating power net- works
Distributed Multi-Period Optimal Power Flow for Demand Response in Microgrids
Trumpf, Jochen
Distributed Multi-Period Optimal Power Flow for Demand Response in Microgrids Paul Scott Methodologies]: Artificial Intelligence Keywords OPF; ADMM; demand response; distributed control; micro- grid-coupled behaviours. In this new regime demand response (DR) techniques will play a central role in providing
A COMPUTATIONAL ANALYSIS OF THE OPTIMAL POWER FLOW PROBLEM
under these contingencies was exemplified by the blackout in the North American power grid during 2003. The reason for the blackout was a failure of only a handful of contingencies in the network [8
Lavaei, Javad
1 Abstract-- The optimal power flow (OPF) problem is a critical problem for power generation flow on the line P: vector of active power generations Q: vector of reactive power generations L: loss/reactive power generation limits. Given the practical importance of the problem, a great many studies have been
Grothey, Andreas
is primarily due to Kirchhoff's voltage law (KVL), which describes the flow of power in transmission lines that minimizes the cost of electric power generation while satisfying operating constraints and meeting demandLocal Solutions of Optimal Power Flow Waqquas A. Bukhsh, Andreas Grothey, Ken McKinnon, and Paul
Outage Detection in Power Distribution Networks with Optimally-Deployed Power Flow Sensors
Zhao, Yue
distribution networks. As society becomes more dependent on electric power, the economic and societal costs due sensor at the substation [2]. In networks This research was supported in part by the DTRA under Grant a single digital transient recording device at the substation, fault location and diagnosis systems have
Chance Constrained Optimal Power Flow: Risk-Aware Network Control under Uncertainty
Bienstock, Daniel; Harnett, Sean
2012-01-01
When uncontrollable resources fluctuate, Optimum Power Flow (OPF), routinely used by the electric power industry to re-dispatch hourly controllable generation (coal, gas and hydro plants) over control areas of transmission networks, can result in grid instability, and, potentially, cascading outages. This risk arises because OPF dispatch is computed without awareness of major uncertainty, in particular fluctuations in renewable output. As a result, grid operation under OPF with renewable variability can lead to frequent conditions where power line flow ratings are significantly exceeded. Such a condition, which is borne by simulations of real grids, would likely resulting in automatic line tripping to protect lines from thermal stress, a risky and undesirable outcome which compromises stability. Smart grid goals include a commitment to large penetration of highly fluctuating renewables, thus calling to reconsider current practices, in particular the use of standard OPF. Our Chance Constrained (CC) OPF correct...
Biogeography-Based Optimization and the Solution of the Power Flow Problem
Simon, Dan
engineer Jules Carpentier [7]. A power utility may own power generating plants fueled by coal, natural gas
Power network analysis and optimization
Zhang, Wanping
2009-01-01
chip power supply network optimization using multigrid-basedchip decoupling capacitor optimization for high- performanceSapatnekar, “Analysis and optimization of structured power/
Optimal power flow application issues in the Pool paradigm George Grossa,*, Ettore Bompardb
Gross, George
a Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Power ramifications. These factors have wide ranging economic impacts, whose implications are very pronounced due consideration of some system performance measures into the steady state analysis of the power system. The basic
Cho, KT; Albertus, P; Battaglia, V; Kojic, A; Srinivasan, V; Weber, AZ
2013-10-07
For storage of grid-scale electrical energy, redox-flow batteries (RFBs) are considered promising technologies. This paper explores the influence of electrolyte composition and ion transport on cell performance by using an integrated approach of experiments and cost modeling. In particular, the impact of the area-specific resistance on system capability is elucidated for the hydrogen/bromine RFB. The experimental data demonstrate very good performance with 1.46 W cm(-2) peak power and 4 A cm(-2) limiting current density at ambient conditions for an optimal cell design and reactant concentrations. The data and cost model results show that higher concentrations of RFB reactants do not necessarily result in lower capital cost as there is a tradeoff between cell performance and storage (tank) requirements. In addition, the discharge time and overall efficiency demonstrate nonlinear effects on system cost, with a 3 to 4 hour minimum discharge time showing a key transition to a plateau in terms of cost for typical RFB systems. The presented results are applicable to many different RFB chemistries and technologies and highlight the importance of ohmic effects and associated area-specific resistance on RFB viability.
Optimizing Power Factor Correction
Phillips, R. K.; Burmeister, L. C.
1986-01-01
FACTOR CORRECTION Robert K. Phillips and Louis C. Burmeister, Mechanical Engineering, University of Kansas, Lawrence, KS The optimal investment for power factor correcting capacitors for Kansas Power and Light Company large power contract customers... consumer of electricity were made for demands of 200, 400, 800, 1,600, 3,200, and 6,400 k\\~ and monthly energy consumption periods of 100, 150, 200, 300, 400, and 500 hours for several capacitor purchase and installation costs. The results...
Structural power flow measurement
Falter, K.J.; Keltie, R.F.
1988-12-01
Previous investigations of structural power flow through beam-like structures resulted in some unexplained anomalies in the calculated data. In order to develop structural power flow measurement as a viable technique for machine tool design, the causes of these anomalies needed to be found. Once found, techniques for eliminating the errors could be developed. Error sources were found in the experimental apparatus itself as well as in the instrumentation. Although flexural waves are the carriers of power in the experimental apparatus, at some frequencies longitudinal waves were excited which were picked up by the accelerometers and altered power measurements. Errors were found in the phase and gain response of the sensors and amplifiers used for measurement. A transfer function correction technique was employed to compensate for these instrumentation errors.
Optimization and Control of Electric Power Systems
Lesieutre, Bernard C.; Molzahn, Daniel K.
2014-10-17
The analysis and optimization needs for planning and operation of the electric power system are challenging due to the scale and the form of model representations. The connected network spans the continent and the mathematical models are inherently nonlinear. Traditionally, computational limits have necessitated the use of very simplified models for grid analysis, and this has resulted in either less secure operation, or less efficient operation, or both. The research conducted in this project advances techniques for power system optimization problems that will enhance reliable and efficient operation. The results of this work appear in numerous publications and address different application problems include optimal power flow (OPF), unit commitment, demand response, reliability margins, planning, transmission expansion, as well as general tools and algorithms.
Xu, Huan
is motivated by the intensifying trend to deploy renewable energy such as wind or solar power. In the state and Huan Xu Abstract-- The integration of renewable energy generation, such as wind power in the Tehachapi area in California [10]. Not only is renewable energy more environmentally friendly, but its
Chandy, K. Mani
time periods. The model is motivated by the intensifying trend to deploy renewable energy such as wind and Huan Xu Abstract-- The integration of renewable energy, such as wind power, into the electric grid from wind projects in the Tehachapi area in California [9]. Not only is renewable energy more
Primus Power's Flow Battery Powered by $11 Million in Private...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Primus Power's Flow Battery Powered by 11 Million in Private Investment Primus Power's Flow Battery Powered by 11 Million in Private Investment June 14, 2011 - 10:00am Addthis...
2012-02-08
GENI Project: MSU is developing a power flow controller to improve the routing of electricity from renewable sources through existing power lines. The fast, innovative, and lightweight circuitry that MSU is incorporating into its controller will eliminate the need for a separate heavy and expensive transformer, as well as the construction of new transmission lines. MSU’s controller is better suited to control power flows from distributed and intermittent wind and solar power systems than traditional transformer-based controllers are, so it will help to integrate more renewable energy into the grid. MSU‘s power flow controller can be installed anywhere in the existing grid to optimize energy transmission and help reduce transmission congestion.
Optimal Average Cost Manufacturing Flow Controllers
Veatch, Michael H.
policy the differ- ential cost is C1 on attractive control switching boundaries. Index Terms Average costOptimal Average Cost Manufacturing Flow Controllers: Convexity and Differentiability Michael H and differentiability of the differential cost function are investigated. It is proven that under an optimal control
Network Flow Optimization under Uncertainty
Tesfatsion, Leigh
, production, generation, transportation, trade, storage injections and withdrawals of coal, gas?) xij is flow along arc (i, j), from node i to node j cij is cost per unit of flow along (i, j Network model in words Minimize the cost of satisfying demands for electric energy By: imports, exports
Broader source: Energy.gov [DOE]
This simple spreadsheet model estimates either the flow rate required to produce a specified level of power output, or the power output that can be produced from a specified flow rate.
Optimal Power Dispatch via Multistage Stochastic Programming
RÃ¶misch, Werner
Mathematical models for cost-optimal power scheduling in hydro-thermal systems often combine several di culties for the dis- patch of electric power in a hydro-thermal generation system over a certain time horizonOptimal Power Dispatch via Multistage Stochastic Programming M.P. Nowak1 and W. Romisch1 Abstract
Power-Aware Scheduling for Makespan and Flow David P. Bunde
Bunde, David
Power-Aware Scheduling for Makespan and Flow David P. Bunde Department of Computer Science Knox different amounts of work. For total flow, we show that the optimal flow corresponding to a particular in computer systems. This is most obvious for battery-powered systems such as laptops because processor power
Power network analysis and optimization
Zhang, Wanping
2009-01-01
and J. N. Kozhaya, “Fast power grid simulation,” in Proc.C. Chen, “Efficient large-scale power grid analysis based onare connected between power grid nodes and the ground. Time-
Combined Thermal and Power Energy Management Optimization
Ahner, D. J.; Priestley, R. R.
1991-01-01
steam headers and equipment outage may modify steam piping configurations. Such considerations may also be introduced and solved in the optimization algorithm. 38 COMBINED THERMAL AND POWER ENERGY MANAGEMENT OPTIMIZATION David J. Ahner Manager... The optimization control may be readily interfaced with other plant control functions as shown in Figure 6. The basic process control is designed to be responsive and stable for the various plant loops and to maintain specified process variable setpoints...
Artificial Neural Network for Optimized Power System Management
OLeary, Daniel Albert
2015-01-01
vii Abstract Artificial Neural Network for Optimized PowerAn Artificial Neural Network (ANN). Data is input to theSANTA CRUZ ARTIFICIAL NEURAL NETWORK FOR OPTIMIZED POWER
Hybrid Wind Power Balance Control Strategy using Thermal Power, Hydro Power and Flow Batteries
MacDonald, Mark
Hybrid Wind Power Balance Control Strategy using Thermal Power, Hydro Power and Flow Batteries the con- trolled use of hybrid flow battery, thermal and hydro power plant system, to support wind power on range of thermal and hydro power plant reaction times. This work suggests that power and energy
Optimized Natural-Laminar-Flow Airfoils and D. W. Zingg
Zingg, David W.
Optimized Natural-Laminar-Flow Airfoils J. Driver and D. W. Zingg University of Toronto Institute-Krylov aerodynamic shape optimization algorithm has been modified to incorporate the prediction of laminar natural-laminar-flow airfoils. In particular, the optimization algorithm is able to design an airfoil
Electric Power System Asset Optimization
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would like submitKansas Nuclear ProfileMultiferroic Electric
Some optimization problems in power system reliability analysis
Jirutitijaroen, Panida
2009-05-15
This dissertation aims to address two optimization problems involving power system reliabilty analysis, namely multi-area power system adequacy planning and transformer maintenance optimization. A new simulation method for power system reliability...
Optimal Power Allocation for Renewable Energy Source
Sinha, Abhinav
2011-01-01
Battery powered transmitters face energy constraint, replenishing their energy by a renewable energy source (like solar or wind power) can lead to longer lifetime. We consider here the problem of finding the optimal power allocation under random channel conditions for a wireless transmitter, such that rate of information transfer is maximized. Here a rechargeable battery, which is periodically charged by renewable source, is used to power the transmitter. All of above is formulated as a Markov Decision Process. Structural properties like the monotonicity of the optimal value and policy derived in this paper will be of vital importance in understanding the kind of algorithms and approximations needed in real-life scenarios. The effect of curse of dimensionality which is prevalent in Dynamic programming problems can thus be reduced. We show our results under the most general of assumptions.
under these contingencies was exemplified by the blackout in the North American power grid during 2003. The reason for the blackout was a failure of only a handful of contingencies in the network [8
Magnetic Amplifier for Power Flow Control
2012-02-24
GENI Project: ORNL is developing an electromagnet-based, amplifier-like device that will allow for complete control over the flow of power within the electric grid. To date, complete control of power flow within the grid has been prohibitively expensive. ORNL’s controller could provide a reliable, cost-effective solution to this problem. The team is combining two types of pre-existing technologies to assist in flow control, culminating in a prototype iron-based magnetic amplifier. Ordinarily, such a device would require expensive superconductive wire, but the magnetic iron core of ORNL’s device could serve as a low-cost alternative that is equally adept at regulating power flow.
Optimization Online Digest -- October 2015
Optimization Online Digest — October 2015. Applications — OR and Management Sciences Polynomial SDP Cuts for Optimal Power Flow Hassan Hijazi ...
Strategies in tower solar power plant optimization
Ramos, A
2012-01-01
A method for optimizing a central receiver solar thermal electric power plant is studied. We parametrize the plant design as a function of eleven design variables and reduce the problem of finding optimal designs to the numerical problem of finding the minimum of a function of several variables. This minimization problem is attacked with different algorithms both local and global in nature. We find that all algorithms find the same minimum of the objective function. The performance of each of the algorithms and the resulting designs are studied for two typical cases. We describe a method to evaluate the impact of design variables in the plant performance. This method will tell us what variables are key to the optimal plant design and which ones are less important. This information can be used to further improve the plant design and to accelerate the optimization procedure.
Robin, A.M.; Kassman, J.S.; Leininger, T.F.; Wolfenbarger, J.K.; Wu, C.M.; Yang, P.P.
1991-09-01
This second Topical Report describes the work that was completed between January 1, 1989 and December 31, 1990 in a Cooperative Agreement between Texaco and the US Department of Energy that began on September 30, 1987. During the period that is covered in this report, the development and optimization of in-situ and external desulfurization processes were pursued. The research effort included bench scale testing, PDU scoping tests, process economic studies and advanced instrument testing. Two bench scale studies were performed at the Research Triangle Institute with zinc titanate sorbent to obtain data on its cycle life, sulfur capacity, durability and the effect of chlorides. These studies quantify sulfur capture during simulated air and oxygen-blown gasification for two zinc titanate formulations. Eight PDU runs for a total of 20 days of operation were conducted to evaluate the performance of candidate sorbents for both in-situ and external desulfurization. A total of 47 tests were completed with oxygen and air-blown gasification. Candidate sorbents included iron oxide for in-situ desulfurization and calcium based and mixed metal oxides for external desulfurization. Gasifier performance and sorbent sulfur capture are compared for both air-blown and oxygen-blown operation.
Optimization of advanced telecommunication algorithms from power and performance perspective
Khan, Zahid
2011-11-22
This thesis investigates optimization of advanced telecommunication algorithms from power and performance perspectives. The algorithms chosen are MIMO and LDPC. MIMO is implemented in custom ASIC for power optimization ...
Solving convex problems involving powers using conic optimization
Glineur, FranÃ§ois
Solving convex problems involving powers using conic optimization and a new self-concordant barrier CFG 07 Heidelberg University CFG 07 Solving convex problems involving powers using conic optimization remarks Future plans CFG 07 Solving convex problems involving powers using conic optimization 2 #12
Flow reversal power limit for the HFBR
Cheng, L.Y.; Tichler, P.R.
1997-01-01
The High Flux Beam Reactor (HFBR) is a pressurized heavy water moderated and cooled research reactor that began operation at 40 MW. The reactor was subsequently upgraded to 60 MW and operated at that level for several years. The reactor undergoes a buoyancy-driven reversal of flow in the reactor core following certain postulated accidents. Questions which were raised about the afterheat removal capability during the flow reversal transition led to a reactor shutdown and subsequent resumption of operation at a reduced power of 30 MW. An experimental and analytical program to address these questions is described in this report. The experiments were single channel flow reversal tests under a range of conditions. The analytical phase involved simulations of the tests to benchmark the physical models and development of a criterion for dryout. The criterion is then used in simulations of reactor accidents to determine a safe operating power level. It is concluded that the limit on the HFBR operating power with respect to the issue of flow reversal is in excess of 60 MW. Direct use of the experimental results and an understanding of the governing phenomenology supports this conclusion.
MATPOWER's Extensible Optimal Power Flow Architecture
Tesfatsion, Leigh
's and LODF's) and for running OPF-based auction markets. The initial motivation for the development platform used to test electricity markets. It requires a "smart market" auction clearing software that uses Technology Solutions and the Office of Electricity Delivery and Energy Reliability, Transmission Reliability
Optimization of Reactive Power based on Newton-Raphson algorithm
Lavaei, Javad
the reactive power optimization procedures. Introduction In modern power system transmission technology, reactive power optimization is so important that it has direct influence on the high quality and stable transmitting electrical energy. The first part of the article describes the importance of the reactive power
Optimal Base Station Density for Power Efficiency in Cellular Networks
Haenggi, Martin
Optimal Base Station Density for Power Efficiency in Cellular Networks Sanglap Sarkar, Radha, power consumption, power efficiency, optimal base station density. I. INTRODUCTION Cell size reduction by increasing the number of macro base stations or adding tiers of low powered base stations. There are two
Optimal Manufacturing Flow Controllers: Zero-Inventory Policies
Veatch, Michael H.
Optimal Manufacturing Flow Controllers: Zero-Inventory Policies and Control Switching Sets Michael, (978) 927-2300, FAX (978) 524-3747, veatch@gordonc.edu Department of Manufacturing Engineering, Boston Kimemia and Gershwin [12] proposed a flow control model of a flexible manufacturing system that has been
Keeping the Power Flowing | Department of Energy
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would likeUniverseIMPACTThousand Cubic Feet) SoldDepartment of EnergyPower Flowing
Power and Delay Optimization in Multi-Hop Wireless Networks
Shihada, Basem
In this paper, we study the optimization problem of transmission power and delay in a multi-hop wireless network of transmission power and queueing delay in wireless networks has1 Power and Delay Optimization in Multi-Hop Wireless Networks Li Xia, Basem Shihada Abstract
Multi-objective optimization of solar tower power plants
Ábrahám, Erika
Multi-objective optimization of solar tower power plants Pascal Richter Center for Computational · Optimization of solar tower power plants 1/20 #12;Introduction Solar tower power plants Solar tower PS10 (11 MW) in Andalusia, Spain · Solar tower with receiver · Heliostat field with self-aligning mirrors
Optimized boundary driven flows for dynamos in a sphere
Khalzov, I. V.; Brown, B. P.; Cooper, C. M.; Weisberg, D. B.; Forest, C. B. [Center for Magnetic Self Organization in Laboratory and Astrophysical Plasmas, University of Wisconsin-Madison, 1150 University Avenue, Madison, Wisconsin 53706 (United States)
2012-11-15
We perform numerical optimization of the axisymmetric flows in a sphere to minimize the critical magnetic Reynolds number Rm{sub cr} required for dynamo onset. The optimization is done for the class of laminar incompressible flows of von Karman type satisfying the steady-state Navier-Stokes equation. Such flows are determined by equatorially antisymmetric profiles of driving azimuthal (toroidal) velocity specified at the spherical boundary. The model is relevant to the Madison plasma dynamo experiment, whose spherical boundary is capable of differential driving of plasma in the azimuthal direction. We show that the dynamo onset in this system depends strongly on details of the driving velocity profile and the fluid Reynolds number Re. It is found that the overall lowest Rm{sub cr} Almost-Equal-To 200 is achieved at Re Almost-Equal-To 240 for the flow, which is hydrodynamically marginally stable. We also show that the optimized flows can sustain dynamos only in the range Rm{sub cr}
Optimal Endogenous Carbon Taxes Electric Power Supply Chains with Power Plants
Nagurney, Anna
Optimal Endogenous Carbon Taxes for Electric Power Supply Chains with Power Plants Anna Nagurney for the determination of optimal carbon taxes applied to electric power plants in the con- text of electric power supply portion of such policy inter- ventions directed at the electric power industry. The general framework
Distributed Power Flow Control: Distributed Power Flow Control using Smart Wires for Energy Routing
2012-04-24
GENI Project: Smart Wire Grid is developing a solution for controlling power flow within the electric grid to better manage unused and overall transmission capacity. The 300,000 miles of high-voltage transmission line in the U.S. today are congested and inefficient, with only around 50% of all transmission capacity utilized at any given time. Increased consumer demand should be met in part with more efficient and an economical power flow. Smart Wire Grid’s devices clamp onto existing transmission lines and control the flow of power within—much like how internet routers help allocate bandwidth throughout the web. Smart wires could support greater use of renewable energy by providing more consistent control over how that energy is routed within the grid on a real-time basis. This would lessen the concerns surrounding the grid’s inability to effectively store intermittent energy from renewables for later use.
Power Optimization and Management in Embedded Systems1 Massoud Pedram
Pedram, Massoud
1 Power Optimization and Management in Embedded Systems1 Massoud Pedram University of Southern under contract number DAAB07-00-C-L516. Abstract Power-efficient design requires reducing power on the system performance and quality of service (QoS). Power-aware high-level language compilers, dynamic power
Optimal Quarantining of Wireless Malware Through Power Control
Sarkar, Saswati
Optimal Quarantining of Wireless Malware Through Power Control M. H. R. Khouzani School devices such as cellphones, smartphones and pocket-PCs are acquiring more computation and communication
Stochastic Co-optimization for Hydro-Electric Power Generation
1 Stochastic Co-optimization for Hydro-Electric Power Generation Shi-Jie Deng, Senior Member, IEEE the optimal scheduling problem faced by a hydro-electric power producer that simultaneously participates in multiple markets. Specifically, the hydro-generator participates in both the electricity spot market
Fe/V Redox Flow Battery Electrolyte Investigation and Optimization
Li, Bin; Li, Liyu; Wang, Wei; Nie, Zimin; Chen, Baowei; Wei, Xiaoliang; Luo, Qingtao; Yang, Zhenguo; Sprenkle, Vincent L.
2013-05-01
Recently invented Fe/V redox flow battery (IVBs) system has attracted more and more attentions due to its long-term cycling stability. In this paper, the factors (such as compositions, state of charge (SOC) and temperatures) influencing the stability of electrolytes in both positive and negative half-cells were investigated by an extensive matrix study. Thus an optimized electrolyte, which can be operated in the temperature ranges from -5oC to 50oC without any precipitations, was identified. The Fe/V flow cells using the optimized electrolytes and low-cost membranes exhibited satisfactory cycling performances at different temperatures. The efficiencies, capacities and energy densities of flow batteries with varying temperatures were discussed in detail.
Increased Power Generation in a Continuous Flow MFC with
Increased Power Generation in a Continuous Flow MFC with Advective Flow through the Porous Anode, The Pennsylvania State University, University Park, Pennsylvania 16802 The maximum power generated in a single without affecting power generation (16). Pt can be replaced by less expensive alternatives such as Co
Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow
Marchese, Francis
Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow Flow
Optimal Bidding Strategies for Wind Power Producers with Meteorological Forecasts
Garulli, Andrea
profiles, raise major challenges to wind power integration into the electricity grid. In this work we studyOptimal Bidding Strategies for Wind Power Producers with Meteorological Forecasts Antonio that the inherent variability in wind power generation and the related difficulty in predicting future generation
Power optimization of wind farms by curtailment of upwind turbines
Power optimization of wind farms by curtailment of upwind turbines Simon Kirkeby Wessel Kongens is shown to increase the total power production of wind farms of dierent size and shape. Several methods by curtailing upwind turbines. It is shown that the annual power production for a square wind farm consisting
Optimal Maintenance Scheduling of a Power Plant with Seasonal
Grossmann, Ignacio E.
hours for periods with high electricity tariff Sasolburg Gas Engine Power Plant 18 Wärtsila 34 SG statement · Gas engine power plant 18 identical engines with generation capacity = 10 MW Only 1Optimal Maintenance Scheduling of a Power Plant with Seasonal Electricity Tariffs Pedro M. Castro
Optimal Power Cost Management Using Stored Energy in Data Centers
Giles, C. Lee
of uninterrupted power supply (UPS) units as energy storage devices. This rep- resents a deviation from the usualOptimal Power Cost Management Using Stored Energy in Data Centers Rahul Urgaonkar, Bhuvan Urgaonkar work opens up a new area in data center power management. Categories and Subject Descriptors C.4
Optimal Power Cost Management Using Stored Energy in Data Centers
Giles, C. Lee
that arise by the use of uninterrupted power supply (UPS) units as energy storage devices. This rep- resentsOptimal Power Cost Management Using Stored Energy in Data Centers Rahul Urgaonkar, Bhuvan Urgaonkar as the storage capacity is increased. Our work opens up a new area in data center power management. Categories
Using Genetic Algorithms to Optimize Social Robot Behavior for Improved Pedestrian Flow
Maciejewski, Anthony A. "Tony"
Using Genetic Algorithms to Optimize Social Robot Behavior for Improved Pedestrian Flow Bryce D pedestrian flow. In this case, a genetic algorithm is applied to find the optimal parameters to a crowded situation can result in significant improvement in pedestrian flow. Using the optimized values
Human Factors Aspects of Power System Flow Animation
Human Factors Aspects of Power System Flow Animation Douglas A. Wiegmann, Gavin R. Essenberg experimental results associated with human factors aspects of using animation to display electric power system. Index Terms--Power System Operations and Planning, Power System Visualization, Animation, Human Factors
Conic optimization of electric power systems
Taylor, Joshua Adam
2011-01-01
The electric power grid is recognized as an essential modern infrastructure that poses numerous canonical design and operational problems. Perhaps most critically, the inherently large scale of the power grid and similar ...
Fast Power Flow Methods 1.0 Introduction
McCalley, James D.
1 Fast Power Flow Methods 1.0 Introduction What we have learned so far is the so-called "full that with a NR. But NR is slow! Often, the problem is not so "tough," and in that case, the so-called fast is fast and robust, it is not very accurate. Solving the power flow equations can be computationally
Utility system integration and optimization models for nuclear power management
Deaton, Paul Ferris
1973-01-01
A nuclear power management model suitable for nuclear utility systems optimization has been developed for use in multi-reactor fuel management planning over periods of up to ten years. The overall utility planning model ...
Optimal Control of Transient Flow in Natural Gas Networks
Zlotnik, Anatoly; Backhaus, Scott
2015-01-01
We outline a new control system model for the distributed dynamics of compressible gas flow through large-scale pipeline networks with time-varying injections, withdrawals, and control actions of compressors and regulators. The gas dynamics PDE equations over the pipelines, together with boundary conditions at junctions, are reduced using lumped elements to a sparse nonlinear ODE system expressed in vector-matrix form using graph theoretic notation. This system, which we call the reduced network flow (RNF) model, is a consistent discretization of the PDE equations for gas flow. The RNF forms the dynamic constraints for optimal control problems for pipeline systems with known time-varying withdrawals and injections and gas pressure limits throughout the network. The objectives include economic transient compression (ETC) and minimum load shedding (MLS), which involve minimizing compression costs or, if that is infeasible, minimizing the unfulfilled deliveries, respectively. These continuous functional optimiza...
DYNAMIC EMBEDDED OPTIMIZATION AND SHOOTING METHODS FOR POWER
for Deregulated Electric Power Systems: Optimization, Control, and Computational Intelligence, J. Chow, F. Wu are not always established formally, nevertheless underlying optimization principles apply. Design questions is usually undesirable, and tends to be induced by inter- actions between generator controllers. In many
Optimal Energy Storage Control Policies for the Smart Power Grid
Koutsopoulos, Iordanis
Optimal Energy Storage Control Policies for the Smart Power Grid Iordanis Koutsopoulos Vassiliki Center for Research and Technology Hellas (CERTH), Greece Abstract--Electric energy storage devices the optimal energy storage control problem from the side of the utility operator. The operator controller
Partially Adaptive Stochastic Optimization for Electric Power ...
Jikai Zou
2015-01-03
Jan 3, 2015 ... Abstract: Electric Power Generation Expansion Planning (GEP) is the problem ... expansion problem under demand and fuel price uncertainty.
Copyright 2013 IEEE. Reprinted, with permission from: Line Limit Preserving Power System Equivalent
system. Line limits are a fundamental part of the formulation for Power Flow problems, Optimal Power Flow (OPF) problems and Security-Constrained Optimal Power Flow (SCOPF) problems for electric power systems generation or loads
Optimizing a Hybrid Energy Storage System for a Virtual Power Plant for Improved Wind Power
Teodorescu, Remus
Optimizing a Hybrid Energy Storage System for a Virtual Power Plant for Improved Wind Power approach to find two optimum energy storages (ESs) to build a hybrid system which is part of a virtual power plant. In this paper it means the combination of the hybrid energy storage system and wind power
Impact of Turbulence Closures and Numerical Errors for the Optimization of Flow Control Devices
Paris-Sud XI, Université de
Impact of Turbulence Closures and Numerical Errors for the Optimization of Flow Control Devices J the use of a Kriging-based global optimization method to determine optimal control parameters conduct an optimization process and measure the impact of numerical and modeling errors on the optimal
Optimal combined wind power forecasts using exogeneous variables
Optimal combined wind power forecasts using exogeneous variables Fannar ¨Orn Thordarson Kongens to the Klim wind farm using three WPPT forecasts based on different weather forecasting systems. It is shown of the thesis is combined wind power forecasts using informations from meteorological forecasts. Lyngby, January
Optimal Maintenance Scheduling of a Gas Engine Power Plant
Grossmann, Ignacio E.
1 Optimal Maintenance Scheduling of a Gas Engine Power Plant Pedro M. Castro Ignacio E. Grossmann MILP starting from GDP model September 4-5 2EWO Fall Meeting 2013 Problem statement · Gas Engine Power Plant Project in Sasolburg (SGEPP) 18 identical gas engines consuming natural gas & producing
Optimal PMU Placement Evaluation for Power System Dynamic State Estimation
Pollefeys, Marc
Optimal PMU Placement Evaluation for Power System Dynamic State Estimation Jinghe Zhang, Student--The synchronized phasor measurement unit (PMU), developed in the 1980s, is considered to be one of the most important devices in the future of power systems. The recent development of PMU technology provides high
Optimizing Thermoelectric Power Factor by Means of a Potential Barrier
1 Optimizing Thermoelectric Power Factor by Means of a Potential Barrier Neophytos Neophytou}@iue.tuwien.ac.at Abstract Large efforts in improving thermoelectric energy conversion are devoted to energy filtering design, ~40% improvement in the thermoelectric power factor can be achieved if the following conditions
Power Modeling and Optimization for GPGPUs
Li, Zhi
2013-05-31
that request high computational performance such as scientific computing, financial applications, medical data processing, and so on. However, GPGPUs is facing severe power challenge due to the increasing number of cores placed on a single chip with decreasing...
Hybrid robust predictive optimization method of power system dispatch
Chandra, Ramu Sharat (Niskayuna, NY); Liu, Yan (Ballston Lake, NY); Bose, Sumit (Niskayuna, NY); de Bedout, Juan Manuel (West Glenville, NY)
2011-08-02
A method of power system dispatch control solves power system dispatch problems by integrating a larger variety of generation, load and storage assets, including without limitation, combined heat and power (CHP) units, renewable generation with forecasting, controllable loads, electric, thermal and water energy storage. The method employs a predictive algorithm to dynamically schedule different assets in order to achieve global optimization and maintain the system normal operation.
Contingency Analysis of Power System using Power Flow
Lavaei, Javad
and to minimize customer outages. i II. Motivation The security of a power grid into account. The other common causes of faults are weather related.0 Typical Causes of Faults iii Source: Richard Brown. Electric Power Distribution
Power Grid Optimization | GE Global Research
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration wouldMass mapSpeedingProgram Guidelines This document w w w.pv - te ch.org Power
Aerodynamic Shape Optimization of Airfoils in Ultra-Low Reynolds Number Flow using
Stanford University
Aerodynamic Shape Optimization of Airfoils in Ultra-Low Reynolds Number Flow using Simultaneous;Aerodynamic Shape Optimization of Airfoils in Ultra-Low Reynolds Number Flow using Simultaneous Pseudo Abstract. The paper presents numerical results of optimized airfoils at ultra-low Reynolds numbers
Computing an operating parameter of a unified power flow controller
Wilson, David G; Robinett, III, Rush D
2015-01-06
A Unified Power Flow Controller described herein comprises a sensor that outputs at least one sensed condition, a processor that receives the at least one sensed condition, a memory that comprises control logic that is executable by the processor; and power electronics that comprise power storage, wherein the processor causes the power electronics to selectively cause the power storage to act as one of a power generator or a load based at least in part upon the at least one sensed condition output by the sensor and the control logic, and wherein at least one operating parameter of the power electronics is designed to facilitate maximal transmittal of electrical power generated at a variable power generation system to a grid system while meeting power constraints set forth by the electrical power grid.
Does the Poynting vector always represent electromagnetic power flow?
Changbiao Wang
2015-07-07
Poynting vector as electromagnetic power flow has prevailed over one hundred years in the community. However in this paper, it is shown from Maxwell equations that the Poynting vector may not represent the electromagnetic power flow for a plane wave in a non-dispersive, lossless, non-conducting, anisotropic uniform medium; this important conclusion revises the conventional understanding of Poynting vector. It is also shown that this conclusion is clearly supported by Fermat's principle and special theory of relativity.
Does the Poynting vector always represent electromagnetic power flow?
Wang, Changbiao
2015-01-01
Poynting vector as electromagnetic power flow has prevailed over one hundred years in the community. However in this paper, it is shown from Maxwell equations that the Poynting vector may not represent the electromagnetic power flow for a plane wave in a non-dispersive, lossless, non-conducting, anisotropic uniform medium; this important conclusion revises the conventional understanding of Poynting vector. It is also shown that this conclusion is clearly supported by Fermat's principle and special theory of relativity.
Lithium Mass Flow Control for High Power Lorentz Force Accelerators
Lithium Mass Flow Control for High Power Lorentz Force Accelerators Andrea D. Kodys1 , Gregory Laboratory, Pasadena, CA 91109 (609).258.5220, choueiri@princeton.edu Abstract. A lithium feeding system has been developed to measure and control propellant flow for 30-200 kW Lithium Lorentz Force Accelerators
Power Signal Processing: A New Perspective for Power Analysis and Optimization
Zhong, Lin
Power Signal Processing: A New Perspective for Power Analysis and Optimization Quming Zhou, Lin the rich set of signal processing techniques. We first investigate the power signal properties of digital systems and analyze their limitations. We then study signal processing tech- niques for detecting temporal
Distributed control for optimal reactive power compensation in smart microgrids
Bolognani, Saverio
2011-01-01
We consider the problem of optimal reactive power compensation for the minimization of power distribution losses in a smart microgrid. We first propose an approximate model for the power distribution network, which allows us to cast the problem into the class of convex quadratic, linearly constrained, optimization problems. We also show how this model provides the tools for a distributed approach, in which agents have a partial knowledge of the problem parameters and state, and can only perform local measurements. Then, we design a randomized, gossip-like optimization algorithm, providing conditions for convergence together with an analytic characterization of the convergence speed. The analysis shows that the best performance can be achieved when we command cooperation among agents that are neighbors in the smart microgrid topology. Numerical simulations are included to validate the proposed model and to confirm the analytic results about the performance of the proposed algorithm.
Liu, Q. H. [University of Tennessee, Knoxville (UTK); Grim, G. M. [University of Tennessee, Knoxville (UTK); Papandrew, A [University of Tennessee, Knoxville (UTK); Turhan, A. [University of Tennessee, Knoxville (UTK); Zawodzinski, Thomas A [ORNL; Mench, Matthew M [ORNL
2012-01-01
The performance of a vanadium flow battery with no-gap architecture was significantly improved via several techniques. Specifically, gains arising from variation of the overall electrode thickness, membrane thickness, and electrode thermal treatment were studied. There is a trade-off between apparent kinetic losses, mass transfer losses, and ionic resistance as the electrode thickness is varied at the anode and cathode. Oxidative thermal pretreatment of the carbon paper electrode increased the peak power density by 16%. Results of the pretreatment in air showed greater improvement in peak power density compared to that obtained with pretreatment in an argon environment. The highest peak power density in a VRB yet published to the author s knowledge was achieved at a value of 767 mW cm 2 with optimized membrane and electrode engineering. 2012 The Electrochemical Society. [DOI: 10.1149/2.051208jes] All rights reserved.
OPTIMIZATION OF COAL PARTICLE FLOW PATTERNS IN LOW NOX BURNERS
Jost O.L. Wendt; Gregory E. Ogden; Jennifer Sinclair; Stephanus Budilarto
2001-09-04
It is well understood that the stability of axial diffusion flames is dependent on the mixing behavior of the fuel and combustion air streams. Combustion aerodynamic texts typically describe flame stability and transitions from laminar diffusion flames to fully developed turbulent flames as a function of increasing jet velocity. Turbulent diffusion flame stability is greatly influenced by recirculation eddies that transport hot combustion gases back to the burner nozzle. This recirculation enhances mixing and heats the incoming gas streams. Models describing these recirculation eddies utilize conservation of momentum and mass assumptions. Increasing the mass flow rate of either fuel or combustion air increases both the jet velocity and momentum for a fixed burner configuration. Thus, differentiating between gas velocity and momentum is important when evaluating flame stability under various operating conditions. The research efforts described herein are part of an ongoing project directed at evaluating the effect of flame aerodynamics on NO{sub x} emissions from coal fired burners in a systematic manner. This research includes both experimental and modeling efforts being performed at the University of Arizona in collaboration with Purdue University. The objective of this effort is to develop rational design tools for optimizing low NO{sub x} burners. Experimental studies include both cold-and hot-flow evaluations of the following parameters: primary and secondary inlet air velocity, coal concentration in the primary air, coal particle size distribution and flame holder geometry. Hot-flow experiments will also evaluate the effect of wall temperature on burner performance.
Transaction Based Power Flow Analysis For Transmission Utilization Allocation
electricity market at the ex ante phase; (ii) MW generations are decided by bilateral contracts and other contributions of individual generators to loads and flows upon the so-called proportional sharing principle the electric power industry moves into an era of supply competition and consumer choice, the power system
Free Flow Power Corporation | Open Energy Information
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION J APPENDIX ECoopButtePowerEdistoWhiskeyFootprint Ventures JumpIndiana:BuildingPower Corporation
Optimization Decomposition of Resistive Power Networks with Energy Storage
Tan, Chee Wei
with the distributed renewable energy sources and energy storage at the endpoints of the network. Renewable energy in a smart grid, motivates the important question: to what extent can moving energy through space and timeOptimization Decomposition of Resistive Power Networks with Energy Storage Xin Lou, Student Member
Optimal Demand Response Based on Utility Maximization in Power Networks
Wierman, Adam
Optimal Demand Response Based on Utility Maximization in Power Networks Na Li, Lijun Chen different appliances including PHEVs and batteries and propose a demand response approach based on utility. The utility company can thus use dynamic pricing to coordinate demand responses to the benefit of the overall
System-Level Power Optimization: Techniques and Tools
De Micheli, Giovanni
System-Level Power Optimization: Techniques and Tools LUCA BENINI Università di Bologna, and storage units, and we review methods for reducing their energy consumption. We also study models releasable by a battery of limited weight and size; (ii) the technical feasibility of high- performance
Optimization of Power Constrained Multi-Source Uplink Relay Networks
Blostein, Steven D.
Department of Electrical and Computer Engineering Queen's University, Kingston, Ontario, K7L3N6, CanadaOptimization of Power Constrained Multi-Source Uplink Relay Networks Yi Zheng and Steven Blostein beamforming in the uplink. Here, multiple single-antenna sources access a multiple- antenna destination
Optimal Demand Response Based on Utility Maximization in Power Networks
Low, Steven H.
-- Demand side management will be a key component of future smart grid that can help reduce peak load interesting properties of the proposed scheme. I. INTRODUCTION Demand side management will be a key componentOptimal Demand Response Based on Utility Maximization in Power Networks Na Li, Lijun Chen
TAS: 89 0227: TAS Recovery Act - Optimization and Control of Electric Power Systems: ARRA
Chiang, Hsiao-Dong
2014-02-01
The name SuperOPF is used to refer several projects, problem formulations and soft-ware tools intended to extend, improve and re-define some of the standard methods of optimizing electric power systems. Our work included applying primal-dual interior point methods to standard AC optimal power flow problems of large size, as well as extensions of this problem to include co-optimization of multiple scenarios. The original SuperOPF problem formulation was based on co-optimizing a base scenario along with multiple post-contingency scenarios, where all AC power flow models and constraints are enforced for each, to find optimal energy contracts, endogenously determined locational reserves and appropriate nodal energy prices for a single period optimal power flow problem with uncertainty. This led to example non-linear programming problems on the order of 1 million constraints and half a million variables. The second generation SuperOPF formulation extends this by adding multiple periods and multiple base scenarios per period. It also incorporates additional variables and constraints to model load following reserves, ramping costs, and storage resources. A third generation of the multi-period SuperOPF, adds both integer variables and a receding horizon framework in which the problem type is more challenging (mixed integer), the size is even larger, and it must be solved more frequently, pushing the limits of currently available algorithms and solvers. The consideration of transient stability constraints in optimal power flow (OPF) problems has become increasingly important in modern power systems. Transient stability constrained OPF (TSCOPF) is a nonlinear optimization problem subject to a set of algebraic and differential equations. Solving a TSCOPF problem can be challenging due to (i) the differential-equation constraints in an optimization problem, (ii) the lack of a true analytical expression for transient stability in OPF. To handle the dynamics in TSCOPF, the set of differential equations can be approximated or converted into equivalent algebraic equations before they are included in an OPF formulation. In Chapter 4, a rigorous evaluation of using a predefined and fixed threshold for rotor angles as a mean to determine transient stability of the system is developed. TSCOPF can be modeled as a large-scale nonlinear programming problem including the constraints of differential-algebraic equations (DAE). Solving a TSCOPF problem can be challenging due to (i) the differential-equation constraints in an optimization problem, (ii) the lack of a true analytical expression for transient stability constraint in OPF. Unfortunately, even the current best TSCOPF solvers still suffer from the curse of dimensionality and unacceptable computational time, especially for large-scale power systems with multiple contingencies. In chapter 5, thse issues will be addressed and a new method to incorporate the transient stability constraints will be presented.
Optimization of wind turbine energy and power factor with an evolutionary computation algorithm
Kusiak, Andrew
Optimization of wind turbine energy and power factor with an evolutionary computation algorithm 2009 Keywords: Wind turbine Power factor Power output Power quality Data mining Neural network Dynamic computation approach for optimization of power factor and power output of wind turbines is discussed. Data
Control and Optimization Meet the Smart Power Grid: Scheduling of Power Demands for Optimal Energy
Koutsopoulos, Iordanis
technologies to enforce sensible use of energy through effective demand load management. We envision a scenario of effective management of power supply and demand loads. Load management is primarily employed by the power by transferring non-emergency power demands at off-peak-load times. Demand load management does not significantly
Power optimization of wind turbines with data mining and evolutionary computation
Kusiak, Andrew
Power optimization of wind turbines with data mining and evolutionary computation Andrew Kusiak for maximization of the power produced by wind turbines is presented. The power optimization objective energy captured from the wind. Power output can be increased by optimization of the pitch angle
Dynamic Power Flow Controller: Compact Dynamic Phase Angle Regulators for Transmission Power Routing
2012-01-03
GENI Project: Varentec is developing compact, low-cost transmission power controllers with fractional power rating for controlling power flow on transmission networks. The technology will enhance grid operations through improved use of current assets and by dramatically reducing the number of transmission lines that have to be built to meet increasing contributions of renewable energy sources like wind and solar. The proposed transmission controllers would allow for the dynamic control of voltage and power flow, improving the grid’s ability to dispatch power in real time to the places where it is most needed. The controllers would work as fail-safe devices whereby the grid would be restored to its present operating state in the event of a controller malfunction instead of failing outright. The ability to affordably and dynamically control power flow with adequate fail-safe switchgear could open up new competitive energy markets which are not possible under the current regulatory structure and technology base.
Heuristic Optimization for the Discrete Virtual Power Plant Dispatch Problem
Petersen, Mette K.; Hansen, Lars H.; Bendtsen, Jan; Edlund, Kristian; Stoustrup, Jakob
2014-10-17
We consider a virtual power plant, which is given the task of dispatching a fluctuating power supply to a portfolio of flexible consumers. The flexible consumers are modeled as discrete batch processes, and the associated optimization problem is denoted the discrete virtual power plant dispatch problem (DVPPDP). First, the nondeterministic polynomial time (NP)-completeness of the discrete virtual power plant dispatch problem is proved formally. We then proceed to develop tailored versions of the meta-heuristic algorithms hill climber and greedy randomized adaptive search procedure (GRASP). The algorithms are tuned and tested on portfolios of varying sizes. We find that all the tailored algorithms perform satisfactorily in the sense that they are able to find sub-optimal, but usable, solutions to very large problems (on the order of 105 units) at computation times on the scale of just 10 s, which is far beyond the capabilities of the optimal algorithms we have tested. In particular, GRASP sorted shows with the most promising performance, as it is able to find solutions that are both agile (sorted) and well balanced, and consistently yields the best numerical performance among the developed algorithms.
Koutsopoulos, Iordanis
2010-01-01
The smart power grid aims at harnessing information and communication technologies to enhance reliability and enforce sensible use of energy. Its realization is geared by the fundamental goal of effective management of demand load. In this work, we envision a scenario with real-time communication between the operator and consumers. The grid operator controller receives requests for power demands from consumers, with different power requirement, duration, and a deadline by which it is to be completed. The objective is to devise a power demand task scheduling policy that minimizes the grid operational cost over a time horizon. The operational cost is a convex function of instantaneous power consumption and reflects the fact that each additional unit of power needed to serve demands is more expensive as demand load increases.First, we study the off-line demand scheduling problem, where parameters are fixed and known. Next, we devise a stochastic model for the case when demands are generated continually and sched...
Optimization of a solar powered absorption cycle under Abu Dhabi's weather conditions
Al-Alili, A.; Hwang, Y.; Radermacher, R. [Department of Mechanical Engineering, University of Maryland, College Park, MD (United States); Kubo, I. [Department of Mechanical Engineering, The Petroleum Institute, Abu Dhabi (United Arab Emirates)
2010-12-15
In order for the solar absorption air conditioners to become a real alternative to the conventional vapour compression systems, their performance has to be improved and their total cost has to be reduced. A solar powered absorption cycle is modeled using the Transient System Simulation (TRNSYS) program and Typical Meteorological Year 2 data of Abu Dhabi. It uses evacuated tube collectors to drive a 10 kW ammonia-water absorption chiller. Firstly, the system performance and its total cost are optimized separately using single objective optimization algorithms. The design variables considered are: the collector slope, the collector mass flow rate, the collector area and the storage tank volume. The single objective optimization results show that MATLAB global optimization methods agree with the TRNSYS optimizer. Secondly, MATLAB is used to solve a multi-objective optimization problem to improve the system's performance and cost, simultaneously. The optimum designs are presented using Pareto curve and show the potential improvements of the baseline system. (author)
Optimal Power Cost Management Using Stored Energy in Data Centers
Urgaonkar, Rahul; Neely, Michael J; Sivasubramaniam, Anand
2011-01-01
Since the electricity bill of a data center constitutes a significant portion of its overall operational costs, reducing this has become important. We investigate cost reduction opportunities that arise by the use of uninterrupted power supply (UPS) units as energy storage devices. This represents a deviation from the usual use of these devices as mere transitional fail-over mechanisms between utility and captive sources such as diesel generators. We consider the problem of opportunistically using these devices to reduce the time average electric utility bill in a data center. Using the technique of Lyapunov optimization, we develop an online control algorithm that can optimally exploit these devices to minimize the time average cost. This algorithm operates without any knowledge of the statistics of the workload or electricity cost processes, making it attractive in the presence of workload and pricing uncertainties. An interesting feature of our algorithm is that its deviation from optimality reduces as the...
Optimal Distributed Voltage Regulation in Power Distribution Networks
Lam, Albert Y S; Dominguez-Garcia, Alejandro; Tse, David
2012-01-01
In this paper, we address the problem of voltage regulation in power distribution networks with deep-penetration of distributed energy resources (DERs), e.g., renewable-based generation, and storage-capable loads such as plug-in hybrid electric vehicles. We cast the problem as an optimization program, where the objective is to minimize the losses in the network subject to constraints on bus voltage magnitudes, limits on active and reactive power injections, transmission line thermal limits and losses. We provide sufficient conditions under which the optimization problem can be solved via its convex relaxation. Using data from existing networks, we show that the conditions are expected to be satisfied by most networks. We also provide an efficient distributed algorithm to solve the problem. The algorithm is asynchronous, with a communication topology that is the same as the electrical network topology. We illustrate the algorithm's performance in the IEEE 34-bus and the 123-bus feeder test systems.
Simulation and Optimization on Power Plant Operation Using SEGA's EOP Program
Zhou, J.; Deng, S.; Turner, W. D.; Liu, M.
2000-01-01
The operation of a cogeneration power plant is complicated. The Energy Optimization Program (EOP, software made by SEGA, Inc.) was designed to simulate and optimize the operation of TAMU power plant. All major plant components were represented...
Simulation and Optimization on Power Plant Operation Using Sega's EOP Program
Zhou, J.; Deng, S.; Turner, W. D.; Liu, M.
2000-01-01
The operation of a cogeneration power plant is complicated. The Energy Optimization Program (EOP, software made by SEGA, Inc.) was designed to simulate and optimize the operation of TAMU power plant. All major plant components were represented...
Power flow analysis for amplifier design and energy harvesting
Lindner, Douglas K.
. In order to improve the efficiency of an active isolation system we analyze different feedback control energy on a active vibration isolation system it is important to understand the influence of the existingPower flow analysis for amplifier design and energy harvesting Nikola Vujica, Donald J. Leoa
Power Control and Optimization of Photovoltaic and Wind Energy Conversion Systems /
Ghaffari, Azad
2013-01-01
Power Optimization and Control in Wind Energy Conversion Systemspower point tracking in wind energy conversion systems,”power point tracking of wind energy conversion systems based
Optimal Power Market Participation of Plug-In Electric Vehicles Pooled by Distribution Feeder
Caramanis, Michael
Optimal Power Market Participation of Plug-In Electric Vehicles Pooled by Distribution Feeder : Power system markets, Power system economics Key Words: Load management, Electric vehicle grid Transactions on Power Systems #12;WORKING PAPER 1 Optimal Power Market Participation of Plug-In Electric
Start-up Optimization of a Combined Cycle Power Plant A. Linda, E. Sllberga,
Start-up Optimization of a Combined Cycle Power Plant A. Linda, E. Sällberga, S. Velutb, S the dynamic start-up procedure of a com- bined cycle power plant can be optimized using di- rect collocation. Keywords: Combined Cycle Power Plants, Start-up, Dynamic optimization, Optimica, Control, Modelica
Physical Layer Security with Artificial Noise: Secrecy Capacity and Optimal Power Allocation
Zhou, Xiangyun "Sean"
as the objective function to optimize transmit power allocation between the information signal and the artificial expression as the objective function, we investigate the optimal transmit power allocation betweenPhysical Layer Security with Artificial Noise: Secrecy Capacity and Optimal Power Allocation
Co-optimization of Performance and Power in a Superscalar Processor Design
Wong, Weng Fai
. As process technology scales down, power wall starts to hinder im- provements in processor performanceCo-optimization of Performance and Power in a Superscalar Processor Design Yongxin Zhu1 , Weng. Performance optimization has to proceed under a power constraint. The co-optimization requires exploration
Probabilistic Vulnerability Assessment Based on Power Flow and Voltage Distribution
Ma, Jian; Huang, Zhenyu; Wong, Pak C.; Ferryman, Thomas A.
2010-04-30
Risk assessment of large scale power systems has been an important problem in power system reliability study. Probabilistic technique provides a powerful tool to solve the task. In this paper, we present the results of a study on probabilistic vulnerability assessment on WECC system. Cumulant based expansion method is applied to obtain the probabilistic distribution function (PDF) and cumulative distribution function (CDF) of power flows on transmission lines and voltage. Overall risk index based on the system vulnerability analysis is calculated using the WECC system. The simulation results based on WECC system is used to demonstrate the effectiveness of the method. The methodology can be applied to the risk analysis on large scale power systems.
Primary Side Power Flow Control of Wireless Power Transfer for Electric Vehicle Charging
Miller, John M; Onar, Omer C; Chinthavali, Madhu Sudhan
2015-01-01
Various noncontacting methods of plug-in electric vehicle charging are either under development or now deployed as aftermarket options in the light-duty automotive market. Wireless power transfer (WPT) is now the accepted term for wireless charging and is used synonymously for inductive power transfer and magnetic resonance coupling. WPT technology is in its infancy; standardization is lacking, especially on interoperability, center frequency selection, magnetic fringe field suppression, and the methods employed for power flow regulation. This paper proposes a new analysis concept for power flow in WPT in which the primary provides frequency selection and the tuned secondary, with its resemblance to a power transmission network having a reactive power voltage control, is analyzed as a transmission network. Analysis is supported with experimental data taken from Oak Ridge National Laboratory s WPT apparatus. This paper also provides an experimental evidence for frequency selection, fringe field assessment, and the need for low-latency communications in the feedback path.
Optimizing interventions for the treatment of vascular flow disruptions
Boval, Brett Lawrence
2014-01-01
All tissues rely on perfusion and therefore intact blood flow. When flow is disrupted the coupled interaction between the functional and fluid domains of a tissue is impeded and viability is lost. Aortic stenosis is a ...
Power Optimal Routing in Wireless Networks Rajit Manohar and Anna Scaglione
Manohar, Rajit
Power Optimal Routing in Wireless Networks Rajit Manohar and Anna Scaglione ECE, Cornell University Abstract-- Reducing power consumption and increasing bat- tery life of nodes in an ad-hoc network requires an integrated power control and routing strategy. Power optimal routing selects the multi-hop links that require
Thornton, Mitchell
cir- cuit directly contributes to overall power dissipation. By ap- proximating the switching activity in producing digital circuits optimized for low power dissipa- tion. The design of low power consumption designers to place emphasis on optimization for low power dissipation, see e.g. [7] for an excellent
Optimal quantum-enhanced interferometry using a laser power source
Matthias D. Lang; Carlton M. Caves
2013-10-28
We consider an interferometer powered by laser light (a coherent state) into one input port and ask the following question: what is the best state to inject into the second input port, given a constraint on the mean number of photons this state can carry, in order to optimize the interferometer's phase sensitivity? This question is the practical question for high-sensitivity interferometry. We answer the question by considering the quantum Cram{\\'e}r-Rao bound for such a setup. The answer is squeezed vacuum.
Gupta, Shubham, Ph. D. Massachusetts Institute of Technology
2012-01-01
We propose a tractable optimization framework for network Air Traffic Flow Management (ATFM) with an eye towards the future. The thesis addresses two issues in ATFM research: a) fairness and collaboration amongst airlines; ...
Power Control and Optimization of Photovoltaic and Wind Energy Conversion Systems /
Ghaffari, Azad
2013-01-01
be realized by capturing wind power at altitudes over the2011. [2] ——, “High altitude wind power systems: A survey onOckels, “Optimal cross-wind towing and power generation with
Power Saving Optimization for Linear Collider Interaction Region Parameters
Seryi, Andrei; /SLAC
2009-10-30
Optimization of Interaction Region parameters of a TeV energy scale linear collider has to take into account constraints defined by phenomena such as beam-beam focusing forces, beamstrahlung radiation, and hour-glass effect. With those constraints, achieving a desired luminosity of about 2E34 would require use of e{sup +}e{sup -} beams with about 10 MW average power. Application of the 'travelling focus' regime may allow the required beam power to be reduced by at least a factor of two, helping reduce the cost of the collider, while keeping the beamstrahlung energy loss reasonably low. The technique is illustrated for the 500 GeV CM parameters of the International Linear Collider. This technique may also in principle allow recycling the e{sup +}e{sup -} beams and/or recuperation of their energy.
Derivation of Locational Marginal Prices for Restructured Wholesale Power Markets
Tesfatsion, Leigh
the performance of these markets. In this paper, different AC and DC optimal power flow (OPF) models are presented Operator (MISO). Keywords: Locational marginal pricing, wholesale power market, AC optimal power flow, DC optimal power flow, U.S. Midwest Independent System Operator (MISO). #12;3 1 INTRODUCTION In an April 2003
GLOBAL OPTIMIZATION OF MULTIPHASE FLOW NETWORKS IN OIL AND GAS PRODUCTION SYSTEMS
Johansen, Tor Arne
1 GLOBAL OPTIMIZATION OF MULTIPHASE FLOW NETWORKS IN OIL AND GAS PRODUCTION SYSTEMS MSc. Hans, NTNU, Trondheim, Norway Abstract A mathematical program for finding the optimal oil production rates in an oil production system is developed. Each well may be manipulated by injecting lift gas and adjusting
Formation of a laminar electron flow for 300 GHz high-power pulsed gyrotron
Yamaguchi, Yuusuke; Tatematsu, Yoshinori; Saito, Teruo; Ikeda, Ryosuke; Mudiganti, Jagadish C.; Ogawa, Isamu; Idehara, Toshitaka [Research Center for Development of Far-Infrared Region, University of Fukui, 3-9-1 Bunkyo, Fukui-shi 910-8507 (Japan)
2012-11-15
This paper describes the design of a triode magnetron injection gun for use in a 200 kW, 300 GHz gyrotron. As power and frequency increase, the performance of the gyrotron becomes quite sensitive to the quality of the electron beam. Formation of a laminar electron flow is essential for the realization of a high quality beam with a small velocity spread. In this study, a new method is developed for a quantitative evaluation of the laminarity and is applied to optimize the electrode design. The laminarity depends not only on conventional design parameters such as the cathode slant angle but also on the spatial distribution of the electric field along the beam trajectory. In the optimized design, the velocity pitch factors, {alpha}, larger than 1.2 are obtained at 65 kV, 10 A with spreads, {Delta}{alpha}, less than 5%.
Power network verication and optimization at planning stages
Du, Peng
2012-01-01
tive resistances among power stations for reducing the powerresistances among power stations for decreasing power lossesresistances among power stations for reducing the power
Aalborg Universitet Power Flow Analysis Algorithm for Islanded LV Microgrids Including Distributed
Vasquez, Juan Carlos
Aalborg Universitet Power Flow Analysis Algorithm for Islanded LV Microgrids Including Distributed., & Guerrero, J. M. (2014). Power Flow Analysis Algorithm for Islanded LV Microgrids Including Distributed.aau.dk on: juli 04, 2015 #12;Power Flow Analysis Algorithm for Islanded LV Microgrids Including Distributed
Aalborg Universitet Power flow analysis for DC voltage droop controlled DC microgrids
Vasquez, Juan Carlos
Aalborg Universitet Power flow analysis for DC voltage droop controlled DC microgrids Li, Chendan). Power flow analysis for DC voltage droop controlled DC microgrids. In Proceedings of the 11th.aau.dk on: juli 07, 2015 #12;Power flow analysis for DC voltage droop controlled DC microgrids Chendan Li
Optimization of a Steady-State Tokamak-Based Power Plant
Optimization of a Steady-State Tokamak-Based Power Plant Farrokh Najmabadi University of California, San Diego, La Jolla, CA IEA Workshop 59 "Shape and aspect ratio optimization for high , steady between a physics optimization and an integrated systems optimization Identify key impact of physics
Optimization and hybridization of membrane-based oxy-combustion power plants
Gunasekaran, Surekha
2013-01-01
This thesis considers the optimization and hybridization of advanced zero emissions power (AZEP) cycles. More specifically, existing flowsheets for zero and partial emissions are optimized, and new integration schemes with ...
Optimization of Wind Power and Its Variability With a Computational Intelligence Approach
Kusiak, Andrew
Optimization of Wind Power and Its Variability With a Computational Intelligence Approach Zijun is presented for maximizing the generation of wind power while minimizing its variability. In the optimization model, data-driven approaches are used to model the wind-power generation process based on industrial
Lindner, Douglas K.
Design Optimization of Power Electronics Circuits using Genetic Algorithms A Boost PFC Converter with a developed software tool for designing a low-cost boost power factor correction (PFC) front-end converter presents an approach to discrete design optimization of a complete power electronics converter
OPTIMAL POWER/DELAY TRADE-OFFS IN WIRELESS COMMUNICATIONS SMALL DELAY ASYMPTOTICS
Berry, Randall
OPTIMAL POWER/DELAY TRADE-OFFS IN WIRELESS COMMUNICATIONS SMALL DELAY ASYMPTOTICS Randall A@ece.northwestern.edu ABSTRACT In this paper we consider the optimal trade-off between av- erage transmission power and average the behavior of this trade-off in the regime of asymptotically large power and small delay. Our focus
Power-Optimal Scheduling for a Green Base Station with Delay Constraints
Sharma, Vinod
Power-Optimal Scheduling for a Green Base Station with Delay Constraints Anusha Lalitha, Santanu with average delay constraint on the downlink of a Green Base- station. A Green Base-station is powered by both Terms--Power-optimal, Green Base station, Delay con- straint, multi-user. I. INTRODUCTION The main
Optimal Power Allocation and Scheduling for Two-Cell Capacity Maximization
Øien, Geir E.
Optimal Power Allocation and Scheduling for Two-Cell Capacity Maximization Anders Gjendemsjø, David consider the problem of optimally allo- cating the base station transmit power in two neighboring cells sched- uler [1] is generalized to the two-cell case. Thus, both power allocation and multiuser diversity
Model Order Reduction in Porous Media Flow Simulation and Optimization
Ghasemi, Mohammadreza
2015-05-06
Subsurface flow modeling and simulation is ubiquitous in many energy related processes, including oil and gas production. These models are usually large scale and simulating them can be very computationally demanding, particularly in work...
Flow control optimization in a jet engine serpentine inlet duct
Kumar, Abhinav
2009-05-15
Computational investigations were carried out on an advanced serpentine jet engine inlet duct to understand the development and propagation of secondary flow structures. Computational analysis which went in tandem with experimental investigation...
Optimal Contract for Wind Power in Day-Ahead Electricity Markets
Wierman, Adam
Optimal Contract for Wind Power in Day-Ahead Electricity Markets Desmond W. H. Cai1 Sachin Adlakha2 integration in current electric power systems. In this work, we study how a wind power producer can bid wind power producer will produce as much as wind power is available (up to its contract size). 1
Optimal Load Management System for Aircraft Electric Power Distribution
Maasoumy, Mehdi; Nuzzo, Pierluigi; Iandola, Forrest; Kamgarpour, Maryam; Sangiovanni-Vincentelli, Alberto; Tomlin, Claire
2014-01-01
Optimal Load Management System for Aircraft Electric Poweris to develop an optimal load management system based on thescheme where a high-level load management system receives as
A Global Optimization Approach to the Design of Solar Power Plants
Apr 1, 2014 ... A Global Optimization Approach to the Design of Solar Power Plants. E. Carrizosa (ecarrizosa ***at*** us.es) C. DomÃnguez-Bravo ...
Liu, Hui-Hai
2011-01-01
gradient because water flux, energy gradient, and K areis equal to the energy carried by the water flowing into thevolume minus the energy carried by the water flowing out of
Liu, G.; Liu, M.
2006-01-01
This paper presents a new building energy monitoring and pump speed control method. The pump speed is controlled to maintain the system resistance at an optimized value to approach the best pump efficiency and save pump power. The system resistance...
Artificial Neural Network for Optimized Power System Management
OLeary, Daniel Albert
2015-01-01
nineteen percent), and hydroelectric power (seven percent) [rich countries. • Hydroelectric power is ideal in many ways,
Mayhorn, Ebony T
2015-08-09
This dissertation investigates the problem of optimally coordinating distributed energy resources (DERs) in isolated power systems. It is motivated by the recent efforts worldwide of integrating large amounts of renewable generation into power grids...
Application of Flow Battery in Marine Current Turbine System for Daily Power Management
Brest, Université de
Application of Flow Battery in Marine Current Turbine System for Daily Power Management Zhibin Zhou focuses on a grid-connected MCT system and proposes using vanadium redox flow battery (VRB) energy storage and to guarantee the expected power injection to the local grid. Keywords--Marine current turbine, flow battery
Parallel Processing Implementation of the Unit Commitment Problem with Full AC Power Flow power flow model, which per- mits addressing voltage limits, as well as more real- istic branch flow specific kbd is achieved. Lagrangian relaxation allows trading a direct solution approach exhibiting
Passive Acoustic Detection of Wind Turbine In-Flow Conditions for Active Control and Optimization
Murray, Nathan E.
2012-03-12
Wind is a significant source of energy; however, the human capability to produce electrical energy still has many hurdles to overcome. One of these is the unpredictability of the winds in the atmospheric boundary layer (ABL). The ABL is highly turbulent in both stable and unstable conditions (based on the vertical temperature profile) and the resulting fluctuations can have a dramatic impact on wind turbine operation. Any method by which these fluctuations could be observed, estimated, or predicted could provide a benefit to the wind energy industry as a whole. Based on the fundamental coupling of velocity fluctuations to pressure fluctuations in the nearly incompressible flow in the ABL, This work hypothesizes that a ground-based array of infrasonic pressure transducers could be employed to estimate the vertical wind profile over a height relevant for wind turbines. To analyze this hypothesis, experiments and field deployments were conducted. Wind tunnel experiments were performed for a thick turbulent boundary layer over a neutral or heated surface. Surface pressure and velocity probe measurements were acquired simultaneously. Two field deployments yielded surface pressure data from a 49 element array. The second deployment at the Reese Technology Center in Lubbock, TX, also included data from a smaller aperture, 96-element array and a 200-meter tall meteorological tower. Analysis of the data successfully demonstrated the ability to estimate the vertical velocity profile using coherence data from the pressure array. Also, dynamical systems analysis methods were successful in identifying and tracking a gust type event. In addition to the passive acoustic profiling method, this program also investigated a rapid response Doppler SODAR system, the optimization of wind turbine blades for enhanced power with reduced aeroacoustic noise production, and the implementation of a wireless health monitoring system for the wind turbine blades. Each of these other objectives was met successfully. The use of phase unwrapping applied to SODAR data was found to yield reasonable results for per-pulse measurements. A health monitoring system design analysis was able to demonstrate the ability to use a very small number of sensors to monitor blade health based on the blade's overall structural modes. Most notable was the development of a multi-objective optimization methodology that successfully yielded an aerodynamic blade design that produces greater power output with reduced aerodynamic loading noise. This optimization method could be significant for future design work.
Artificial Neural Network for Optimized Power System Management
OLeary, Daniel Albert
2015-01-01
nineteen percent), and hydroelectric power (seven percent) [rich countries. • Hydroelectric power is ideal in many ways,like hydroelectric dams, the construction of nuclear power
Artificial Neural Network for Optimized Power System Management
OLeary, Daniel Albert
2015-01-01
3.2 Wind and Power ConsumptionThe power consumption fitness analysis of a standard,of Figures A model of the power management model decision
Artificial Neural Network for Optimized Power System Management
OLeary, Daniel Albert
2015-01-01
3.2 Wind and Power Consumptionsolid angle. Wind and Power Consumption Measurements Windfor the prediction of solar and wind power pro- duction and
Power network verication and optimization at planning stages
Du, Peng
2012-01-01
Results and Summary . . . . . . . . vi Chapter 3 Power Gridof the power grid. . . . . . . . . . . . . . Zoom-in part ofparameters of a power grid . . . . . . . . . . . . . . Table
Artificial Neural Network for Optimized Power System Management
OLeary, Daniel Albert
2015-01-01
into the aging US power grid requires new technologies andtechniques. This improved power grid, the smart grid, willutility for the overall power grid, and the prosumer needs
2012-02-24
GENI Project: Sandia National Laboratories is working with several commercial and university partners to develop software for market management systems (MMSs) that enable greater use of renewable energy sources throughout the grid. MMSs are used to securely and optimally determine which energy resources should be used to service energy demand across the country. Contributions of electricity to the grid from renewable energy sources such as wind and solar are intermittent, introducing complications for MMSs, which have trouble accommodating the multiple sources of price and supply uncertainties associated with bringing these new types of energy into the grid. Sandia’s software will bring a new, probability-based formulation to account for these uncertainties. By factoring in various probability scenarios for electricity production from renewable energy sources in real time, Sandia’s formula can reduce the risk of inefficient electricity transmission, save ratepayers money, conserve power, and support the future use of renewable energy.
OPTIMAL OPERATION OF AN INTEGRATED ENERGY PARK INCLUDING FOSSIL FUEL POWER GENERATION,
Stanford University
OPTIMAL OPERATION OF AN INTEGRATED ENERGY PARK INCLUDING FOSSIL FUEL POWER GENERATION, CO2 CAPTURE combustion turbine, and wind generation. Energy park com- ponents are modeled using energy and mass balances. A formal optimization proce- dure is used to determine the optimal hourly dispatch of energy park
Stochastic Modeling and Optimization for Robust Power Management in a Partially Observable System
Qiu, Qinru
-of-the- art system modules are capable of trading power for performance or being put into sleep or low powerStochastic Modeling and Optimization for Robust Power Management in a Partially Observable System As the hardware and software complexity grows, it is unlikely for the power management hardware/software to have
Paris-Sud XI, Université de
Optimal transition from coal to gas and renewable power under capacity constraints and adjustment existing coal power plants to gas and renewable power under a carbon budget. It solves a model of polluting, exhaustible resources with capacity constraints and adjustment costs (to build coal, gas, and renewable power
Artificial Neural Network for Optimized Power System Management
OLeary, Daniel Albert
2015-01-01
times when solar power produced exceeded the home’s power2014. This home’s power included solar panel production,solar, and one consumption model, the power usage in a home.
Energy 42 (2012) 486-496 Thermoeconomic operation optimization of a coal-fired power plant
Luh, Peter
2012-01-01
optimization of a coal-fired power plant Jie Xiong a, Haibo Zhao a.*, Chao Zhang a, Chuguang Zheng a, Peter B. Luh b aState Key Laboratory of Coal Combustion. Huazhong University ofSdence and Technology. Wuhan optimization on a 300 MW coal-fired power plant located in Yiyang (Hunan Province, China) is accomplished based
Power system analysis project Modeling and Sizing optimization of Stand-alone
Lavaei, Javad
Power system analysis project Modeling and Sizing optimization of Stand-alone photovoltaic/wind to explore a new way to do the site matching of wind turbine by introducing the design parameters: cut-in, cut-out wind speed and rated power, into the optimization based on the real load of the site and write
Design, Analysis and Optimization of the Power Conversion System for the Modular Pebble Bed Reactor August 31, 2003 Certified by Ronald G. Ballinger Professor of Nuclear Engineering and Materials Science;2 #12;Design, Analysis, and Optimization of the Power Conversion System for the Modular Pebble Bed
Hierarchical DWT Based Optimal Diversity Power Allocation for Video Transmission in 4G OFDMA
Jagannatham, Aditya K.
quality video transmission in an OFDMA system, it is critical to optimally distribute the limited power Wireless Systems Sohil Mahajan Electrical Engineering Department Indian Institute of Technology, Kanpur system demonstrate superior performance of the proposed optimal subcarrier power allocation schemes over
Potkonjak, Miodrag
1 Optimizing the Output of a Human-Powered Energy Harvesting System with Miniaturization]. Aside from reducing power consumption in such systems, har- vesting human energy output as a potential mechanical energy from human foot-strikes and explore its configuration and control towards optimized energy
Optimal power-delay trade-offs in fading channels -small delay asymptotics
Berry, Randall
1 Optimal power-delay trade-offs in fading channels - small delay asymptotics Randall A. Berry Dept, we study the behavior of the optimal power-delay trade-off for a single user in the regime@ece.northwestern.edu Abstract When transmitting stochastically arriving data over fading channels there is an inherent trade
Leakage Power Optimization With Dual-Vth Library In High-Level Synthesis*
Zhou, Hai
algorithm for leakage power optimization based on the maximum weight independent set problem. A dual as the maximum weight independent set (MWIS) problem. The solution is weighed and the objective is to produce13.2 202 Leakage Power Optimization With Dual-Vth Library In High-Level Synthesis* Xiaoyong Tang
Pedram, Massoud
Concurrent Optimization of Consumer's Electrical Energy Bill and Producer's Power Generation Cost their electric bill. On the other hand optimizing the number and production time of power generation facilities lower cost. I. INTRODUCTION There is no substitute for the status of electrical energy, which
Optimal Power Policy for Energy Harvesting Transmitters with Inefficient Energy Storage
Yener, Aylin
1 Optimal Power Policy for Energy Harvesting Transmitters with Inefficient Energy Storage Kaya with an inefficient energy storage device, i.e., battery or capacitor, is considered, where a fraction of the stored for optimal power allocations with energy harvesting transmitters, it is observed that storage losses
Maximizing the Performance of Wind Turbines with Nonlinear Aeroservoelastic Power Flow Control
1 Maximizing the Performance of Wind Turbines with Nonlinear Aeroservoelastic Power Flow Control by a wind turbine by operating at the edge of dynamic stall. This paper applies a novel nonlinear power flow of the first torsional mode of a nominal 5 MW rated power wind turbine blade. This model is analyzed using
Nonlinear Power Flow Control Design: Utilizing Exergy, Entropy, Static and Dynamic
Nonlinear Power Flow Control Design: Utilizing Exergy, Entropy, Static and Dynamic Stability (future electric power grid control, wind turbine load alleviation control, and novel micro-grid control provide the theoretical foundations necessary to view control design as power flow control problem
A MultiPhase Power Flow Model for Grid Analysis A. P. Sakis Meliopoulos
A MultiPhase Power Flow Model for µµµµGrid Analysis A. P. Sakis Meliopoulos School of Electrical power system with distributed energy sources forming a microgrid (µGrid). The µGrid is a radial multiphase power flow analysis method that provides exact solution to the operation of the µGrid under steady
Finding Benefits by Modeling and Optimizing Steam and Power Systems
Jones, B.; Nelson, D.
2007-01-01
A site-wide steam modeling and optimization program (Visual MESA) was implemented at the INEOS Chocolate Bayou site. This program optimizes steam production, compressor turbine extraction, pump operation (turbine/motor) operation, as well...
Optimal adaptive control of cascading power grid failures1 Version 2010-Dec-20
Bienstock, Daniel
problems. Perhaps best known among the optimization community are the unit commitment problems and related, unlike the typical formulations for the unit commitment problem, includes a detailed model of flows
Steffenhagan, W.; de Sam Lazaro, A.
1995-01-01
to carry out the optimization. The results of this work will be published separately. 8. REFERENCES [1] Naccarino JR., Cheung RT., Briggs W., and Mayur N., Real-time monitoring, optimization and control of a hydroelectric generation complex. IEEE... OPTIMIZATION FOR INDUSTRIAL POWER PLANTS UNDER LOAD FLUCTUATIONS USING FUZZY LOGIC A. de Sam Lazaro and W. Steffenhagan, Department of Mechanical Engineering St Martin's College, Lacey WA 98503 1. INTRODUCTION The automation of the control to a power...
Pollock, George G. (San Ramon, CA)
1997-01-01
Two power supplies are combined to control a furnace. A main power supply heats the furnace in the traditional manner, while the power from the auxiliary supply is introduced as a current flow through charged particles existing due to ionized gas or thermionic emission. The main power supply provides the bulk heating power and the auxiliary supply provides a precise and fast power source such that the precision of the total power delivered to the furnace is improved.
Pollock, G.G.
1997-01-28
Two power supplies are combined to control a furnace. A main power supply heats the furnace in the traditional manner, while the power from the auxiliary supply is introduced as a current flow through charged particles existing due to ionized gas or thermionic emission. The main power supply provides the bulk heating power and the auxiliary supply provides a precise and fast power source such that the precision of the total power delivered to the furnace is improved. 5 figs.
The impact of uncertainty on shape optimization of idealized bypass graft models in unsteady flow
Marsden, Alison L.
in the upstream proximal angle. The impact of cost function choice on the optimal solution was explored construction of a graft over a blocked blood vessel. Depending on the location and the underlying disease of surgical geometry on flow fields and hence wall- shear stress WSS , oscillatory shear index OSI , wall
Paris-Sud XI, Université de
for optimal dispatching of power flows in a microgrid with storage. The investigated approach is based Scheduling and Sensitivity Analysis for Sizing a Microgrid with Storage. (2014) In: 11th International ANALYSIS FOR SIZING A MICROGRID WITH STORAGE R. Rigo-Mariani1 , B. Sareni1 , X. Roboam1 1. Université de
OPTIMAL CONTROL OF THERMALLY CONVECTED FLUID FLOWS \\Lambda K. ITO y AND S.S. RAVINDRAN y
OPTIMAL CONTROL OF THERMALLY CONVECTED FLUID FLOWS \\Lambda K. ITO y AND S.S. RAVINDRAN y Abstract. We examine the optimal control of stationary thermally convected fluid flows from the the oretical and numerical point of view. We use thermal convection as control mechanism, that is, control is effected
Artificial Neural Network for Optimized Power System Management
OLeary, Daniel Albert
2015-01-01
ran S ¸ ahin. Short–mid-term solar power prediction by usingof forecasting techniques for solar power production with noto improve short term solar power predictions. viii To my
Optimal monitoring and visualization of steady state power system operation
Xu, Bei
2009-06-02
Power system operation requires accurate monitoring of electrical quantities and a reliable database of the power system. As the power system operation becomes more competitive, the secure operation becomes highly important ...
Artificial Neural Network for Optimized Power System Management
OLeary, Daniel Albert
2015-01-01
of ANNs for the prediction of solar and wind power pro-developed for the prediction of solar power production thatalgorithms for improved solar prediction looks promising [
Artificial Neural Network for Optimized Power System Management
OLeary, Daniel Albert
2015-01-01
nineteen percent), and hydroelectric power (seven percent) [fuel-rich countries. • Hydroelectric power is ideal in manyHowever the construction of hydroelectric dams have several
Artificial Neural Network for Optimized Power System Management
OLeary, Daniel Albert
2015-01-01
electricity market using PSO. Solar energy, [17] PresidentParticle Swarm Optimization (PSO) algorithm was used with aEV charging, scientists used PSO algorithms to minimize cost
Finding Benefits by Modeling and Optimizing Steam and Power Systems
Harper, C.; Nelson, D. A.
2008-01-01
case studies which can be used to optimize production of these products on our industrial gas pipelines. The program is used for both day-to-day site optimization, outage forecasting, and long-term site planning. In this presentation, we will discuss...
Power Optimization of Wireless Media Systems with Space-Time Code Building
Yousefi'zadeh, Homayoun
between the power consumption and the quality of service in wireless media systems. Fig. 1 includes1 Power Optimization of Wireless Media Systems with Space-Time Code Building Blocks Homayoun solution to the problem of power control in wireless media systems with multiple transmit antennas. We
Optimal Power Allocation Auction for H.264/SVC Coded Wireless Video Transmission
Jagannatham, Aditya K.
quality based auction bidding models. The framework for optimal power allocation is formulated in an OFDMA system. Typical power allocation schemes existing in literature such as those based on the water that are suited to the scenarios of high quality video transmission. Towards this purpose we propose a power
Optimal Resource Allocation for Wireless Video Sensors with Power-Rate-Distortion Model of Imager
Heinzelman, Wendi
role in the resulting video quality as well as in the life-time of the system. The problem of power (WVSs), including the image sensor subsystem into the system analysis. By assigning a power quality under power and rate constraints. To demonstrate the optimization method, we further establish a P
Analysis and Optimization of Maximum Power Point Tracking Algorithms in the Presence of
Odam, Kofi
characteristic. This perturbation reduces the power obtained from the solar panel because the panel is no longerAnalysis and Optimization of Maximum Power Point Tracking Algorithms in the Presence of Noise maximum power point tracking (MPPT) algorithms for photovoltaic systems. Noise is an essential
Lindner, Douglas K.
Design of a Boost Power Factor Correction Converter Using Optimization Techniques Sergio Busquets Foundation under Award Number EEC-9731677. #12;Design of a Boost Power Factor Correction Converter Using of a boost power factor correction front-end converter with an input electromagnetic interference filter
Optimal Design of Power-Split Transmissions for Hydraulic Hybrid Passenger Vehicles
Li, Perry Y.
Optimal Design of Power-Split Transmissions for Hydraulic Hybrid Passenger Vehicles Kai Loon Cheong, Perry Y. Li and Thomas R. Chase Abstract-- Hydraulic hybrid vehicles are inherently power dense. Power-split or hydro-mechanical transmissions (HMT) have advantages over series and parallel architectures
Bulk CMOS Device Optimization for High-Speed and Ultra-Low Power Operations
Nyathi, Jabulani
Bulk CMOS Device Optimization for High-Speed and Ultra-Low Power Operations Brent Bero and Jabulani- Interest in subthreshold design has increased due to the emergence of systems that require ultra-low power creating a clear divide between designing for high speed and ultra-low power. It might be beneficial
Joint Optimal Channel Base Station and Power Assignment for Wireless Access \\Lambda
Tassiulas, Leandros
Joint Optimal Channel Base Station and Power Assignment for Wireless Access \\Lambda Symeon powers, forward (downstream) and reverse (upstream) channels, and base stations such that every mobile the transmission powers both of the base stations and the users will be controllable. This great flexibility
Power-Optimal Pipelining in Deep Submicron Technology Seongmoo Heo and Krste Asanovic
effective techniques for trading time slack for power. Supply voltage reduction leads to a quadratic be used to provide excess performance to trade for lower power, but pipelining has the advantagePower-Optimal Pipelining in Deep Submicron Technology Seongmoo Heo and Krste Asanovi´c MIT
OPTIMIZATION STRATEGIES FOR THE VULNERABILITY ANALYSIS OF THE ELECTRIC POWER GRID
Pinar, Ali
OPTIMIZATION STRATEGIES FOR THE VULNERABILITY ANALYSIS OF THE ELECTRIC POWER GRID ALI PINAR, JUAN would cause a severe blackout, is critical for the secure operation of the electric power grid. We show how power grid vulnerability analysis can be studied as a bilevel mixed integer nonlinear programming
Power Grid Optimization in 3D Circuits Using MIM and CMOS Decoupling Capacitors
Sapatnekar, Sachin
Power Grid Optimization in 3D Circuits Using MIM and CMOS Decoupling Capacitors Pingqiang Zhou severe in 3D. CMOS decoupling capacitors (decaps) have been used effectively for controlling power grid between MIM and CMOS decaps. Experimental results show that power grid noise can be more effectively
Demirel, Melik C.
PENNSTATE Department of Mechanical and Nuclear Engineering Spring 2012 East Campus Power Plant Deaerator Optimization Overview In the East Campus Power plant a new Deaerator system has been installed. Approach Understand the inner-workings and operations of the power plant and the Deaerator system. Visit
Potkonjak, Miodrag
design techniques are used. The average power consumption of a CMOS gate due to the switching component of throughput with increasingly important design metric - power. In particular, we seek to find the extentPower Optimization in Programmable Processors and ASIC Implementations of Linear Systems
Time series power flow analysis for distribution connected PV generation.
Broderick, Robert Joseph; Quiroz, Jimmy Edward; Ellis, Abraham; Reno, Matthew J.; Smith, Jeff; Dugan, Roger
2013-01-01
Distributed photovoltaic (PV) projects must go through an interconnection study process before connecting to the distribution grid. These studies are intended to identify the likely impacts and mitigation alternatives. In the majority of the cases, system impacts can be ruled out or mitigation can be identified without an involved study, through a screening process or a simple supplemental review study. For some proposed projects, expensive and time-consuming interconnection studies are required. The challenges to performing the studies are twofold. First, every study scenario is potentially unique, as the studies are often highly specific to the amount of PV generation capacity that varies greatly from feeder to feeder and is often unevenly distributed along the same feeder. This can cause location-specific impacts and mitigations. The second challenge is the inherent variability in PV power output which can interact with feeder operation in complex ways, by affecting the operation of voltage regulation and protection devices. The typical simulation tools and methods in use today for distribution system planning are often not adequate to accurately assess these potential impacts. This report demonstrates how quasi-static time series (QSTS) simulation and high time-resolution data can be used to assess the potential impacts in a more comprehensive manner. The QSTS simulations are applied to a set of sample feeders with high PV deployment to illustrate the usefulness of the approach. The report describes methods that can help determine how PV affects distribution system operations. The simulation results are focused on enhancing the understanding of the underlying technical issues. The examples also highlight the steps needed to perform QSTS simulation and describe the data needed to drive the simulations. The goal of this report is to make the methodology of time series power flow analysis readily accessible to utilities and others responsible for evaluating potential PV impacts.
Tesfatsion, Leigh
the performance of these markets. In this paper, different AC and DC optimal power flow (OPF) models are presented Terms-- Locational marginal pricing, wholesale power market, AC optimal power flow, DC optimal power to distinct local conditions (e.g., hydroelectric power in the northwest). Even in regions adopting the design
Journal of Power Sources 128 (2004) 5460 Microfluidic fuel cell based on laminar flow
Kenis, Paul J. A.
2004-01-01
Journal of Power Sources 128 (2004) 5460 Microfluidic fuel cell based on laminar flow Eric R compartments. While these PEM-type fuel cell designs have great promise to become the power source of choice a novel microfluidic fuel cell concept that utilizes the occurrence of multi-stream laminar flow
A Comparison of the AC and DC Power Flow Models for LMP Calculations
power flow model for LMP-based market calculations. The paper first provides a general discussion values include generator AVR status, LTC and phase shifting transformer tap positions, discrete switched shifting transformers is often dependent upon the transformer's tap value. Last, the power flow models
Optimization of the axial power shape in pressurized water reactors
Malik, Mushtaq Ahmad
1981-01-01
Analytical and numerical methods have been applied to find the optimum axial power profile in a PWR with respect to uranium utilization. The preferred shape was found to have a large central region of uniform power density, ...
Performance and power optimization in VLSI physical design
Jiang, Zhanyuan
2008-10-10
As VLSI technology enters the nanoscale regime, a great amount of efforts have been made to reduce interconnect delay. Among them, buffer insertion stands out as an effective technique for timing optimization. A dramatic ...
Automated Synthesis Tool for Design Optimization of Power Electronic Converters
Mirjafari, Mehran
2013-01-09
optimization methods. This dissertation will use Technology Characterization Methods (TCM) to bridge the gap between high-level performance attributes and low-level design attributes where direct relationship between these two does not currently exist...
Aerodynamic optimization of a solar powered race vehicle
Augenbergs, Peteris K
2006-01-01
Aerodynamic optimization was performed on Tesseract, the MIT Solar Electric Vehicle Team's 2003-2005 solar car using Wind Tunnel 8 at Jacobs/Sverdrup Drivability Test Facility in Allen Park, MI. These tests include angle ...
Optimal Power Masking in Soft Frequency Reuse based
Gross, James
from the power radiated by the base station of neighboring cells in their communication band-carrier the base stations are restricted to a certain power bound. All these approaches to mitigating CCI can the fraction of the maximum transmit power that the base station may use depending at the part of the spectrum
Optimal Maintenance Scheduling of a Gas Engine Power Plant
Grossmann, Ignacio E.
premature aging and failure of generators leading to unplanned and costly power outages, it is important separately to reduce the manpower requirement. The maintenance scheduling of generators in power systems of these function adversely20 . In traditional power systems, the maintenance scheduling of generator units
Birge, Jonathan R.
The optimization of phase distortion spectral power density is proposed as an alternative to GDD minimization of ultrafast cavity mirrors. This criterion is shown to minimize the detuning of cavity resonances from a uniform comb.
Incremental costs and optimization of in-core fuel management of nuclear power plants
Watt, Hing Yan
1973-01-01
This thesis is concerned with development of methods for optimizing the energy production and refuelling decision for nuclear power plants in an electric utility system containing both nuclear and fossil-fuelled stations. ...
1346 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 23, NO. 3, AUGUST 2008 Optimal Transmission Switching
Ferris, Michael C.
switching in which upper limit on open lines is . I. INTRODUCTION I N large electric networks, transmission1346 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 23, NO. 3, AUGUST 2008 Optimal Transmission Switching, we formulate the problem of finding an optimal generation dispatch and transmission topology to meet
Hierarchical DWT Based Optimal Diversity Power Allocation for Video Transmission in MIMO
Jagannatham, Aditya K.
Systems with Quantized Feedback Sohil Mahajan Electrical Engineering Department Indian Institute beamforming. Hence, to achieve high quality video transmission in a MIMO system, it is critical to optimally algorithm based optimal schemes [1] have been proposed for power allocation in MIMO systems
Asymptotically Optimal Power-Aware Routing for Multihop Wireless Networks with Renewable
Srikant, Rayadurgam
1 Asymptotically Optimal Power-Aware Routing for Multihop Wireless Networks with Renewable Energy the performance of multihop radio networks in the presence of energy constraints, and design routing algorithms to optimally utilize the available energy. The energy model allows vastly different energy sources
Wroblewski, David (Mentor, OH); Katrompas, Alexander M. (Concord, OH); Parikh, Neel J. (Richmond Heights, OH)
2009-09-01
A method and apparatus for optimizing the operation of a power generating plant using artificial intelligence techniques. One or more decisions D are determined for at least one consecutive time increment, where at least one of the decisions D is associated with a discrete variable for the operation of a power plant device in the power generating plant. In an illustrated embodiment, the power plant device is a soot cleaning device associated with a boiler.
DiPippo, R.
1982-02-01
Combined steam-turbine/positive-displacement engine (PDE) geothermal power systems are analyzed thermodynamically and compared with optimized reference flash-steam plants. Three different configurations of combined systems are considered. Treated separately are the cases of self-flowing and pumped wells. Two strategies are investigated that help overcome the inherent expansion-ratio limitation of PDE's: pre-flashing and pre-mixing. Parametrically-obtained results show the required minimum PDE efficiency for the combined system to match the reference plant for various sets of design conditions.
Power Supply Optimization in Sub-130 nm Leakage Dominant Technologies Man L Mui Kaustav Banerjee a methodology for systematically optimizing the power supply voltage for maximizing the performance of VLSI cir- cuits in technologies where leakage power is not an insignificant fraction of the total power
Artificial Neural Network for Optimized Power System Management
OLeary, Daniel Albert
2015-01-01
smart grid to influence distributed generation power systems reduced down time and costssmart grid with flexible EV charging, scientists used PSO algorithms to minimize cost
Artificial Neural Network for Optimized Power System Management
OLeary, Daniel Albert
2015-01-01
load, and the diesel battery storage, they minimized the usebattery. A decision must be made about the use of power, given considerations about storage
Optimization Online - The Worst-case Wind Power Scenario for ...
German Morales-EspaÃ±a
2014-09-16
Sep 16, 2014 ... The Worst-case Wind Power Scenario for Adaptive Robust Unit Commitment Problems. German Morales-EspaÃ±a(gmorales ***at*** kth.se).
Artificial Neural Network for Optimized Power System Management
OLeary, Daniel Albert
2015-01-01
production data • Day - when solar energy is consistent (onvolatility of the solar energy production data Solar Power [conversion of solar radiation data. Energy Conversion and
Optimization of a Two-Fluid Hydrodynamic Model of Churn-Turbulent Flow
Donna Post Guillen
2009-07-01
A hydrodynamic model of two-phase, churn-turbulent flows is being developed using the computational multiphase fluid dynamics (CMFD) code, NPHASE-CMFD. The numerical solutions obtained by this model are compared with experimental data obtained at the TOPFLOW facility of the Institute of Safety Research at the Forschungszentrum Dresden-Rossendorf. The TOPFLOW data is a high quality experimental database of upward, co-current air-water flows in a vertical pipe suitable for validation of computational fluid dynamics (CFD) codes. A five-field CMFD model was developed for the continuous liquid phase and four bubble size groups using mechanistic closure models for the ensemble-averaged Navier-Stokes equations. Mechanistic models for the drag and non-drag interfacial forces are implemented to include the governing physics to describe the hydrodynamic forces controlling the gas distribution. The closure models provide the functional form of the interfacial forces, with user defined coefficients to adjust the force magnitude. An optimization strategy was devised for these coefficients using commercial design optimization software. This paper demonstrates an approach to optimizing CMFD model parameters using a design optimization approach. Computed radial void fraction profiles predicted by the NPHASE-CMFD code are compared to experimental data for four bubble size groups.
A Power-Law Formulation of Laminar Flow in Short Pipes Max Sherman
A Power-Law Formulation of Laminar Flow in Short Pipes Max Sherman Indoor Environment Program ABSTRACT This report develops a theoretical description of the hydrodynamic relationship based on a power pipes can be described with a simple power law dependence on pressure, but that the exponent
Power Flow Analysis Algorithm for Islanded LV Microgrids Including Distributed Generator Units with
Chaudhary, Sanjay
Power Flow Analysis Algorithm for Islanded LV Microgrids Including Distributed Generator Units power system. Being able to operate in both grid-connected and islanded mode, a microgrid manages and controls distributed energy resources, energy storage systems and loads, most of them are power electronic
A Novel Power Flow Method for Long Term Frequency Stability Analysis
Yan, Wenjin
2013-05-06
This thesis presents a novel approach for a power system to find a practical power flow solution when all the generators in the system have hit their real power output limits, such as some generator units shutting down or load outages. The approach...
Power Conversion Efficiency Characterization and Optimization for Smartphones
Pedram, Massoud
waste a significant amount of the battery's stored energy during power con- version from the 3.7V output this energy waste in smartphones is to (i) profile the power consumption of each module under different with a multi-core gi- gahertz processor, gigabytes of high-speed DDR SDRAM, dozens of gigabytes of flash memory
Application of Symbolic Analysis to Power and Ground Interconnect Optimization
Sapatnekar, Sachin
submicron levels · Vdd levels going down to conserve power · Power and Ground buses cannot be assumed to be perfect conductors · P&G buses must be designed carefully to ensure that supply voltage levels are maintained at appropriate levels. · Better CAD techniques needed for estimation of voltage drops in P&G buses
Optimal distributed power generation under network load constraints
Utrecht, Universiteit
, small wind turbine or central heating power units) can be inserted into any transmission line, mainly because of the development of novel components for decentral power generation (solar panels, small wind turbines and heat pumps). This gives rise to the question how many units of each type (solar panel
POWER FLOW ANALYSIS OF ELECTROSTRICTIVE ACTUATORS DRIVEN BYSWITCHMODE AMPLIFIERS
Lindner, Douglas K.
of that energy. We adopt this view in this paper. The analysis in this paper is motivated by the smart skin being Consider the flow of energy through this smart skin. Electrical energy is supplied to the smart skin from energy into mechanical energy. This mechanical energy then flows from the smart skin into the surrounding
When Simplicity Meets Optimality: Efficient Transmission Power Control with
Liu, Mingyan
function, e.g., the total data rate. We develop simple control policies that achieve near optimal the energy constraint that low cost (mobile) wireless devices operate under and prolong their operational usually fluctuates due to environmental factors (e.g., in the case of wind and solar energy
Off Shore Wind Farm Siting Optimization (Implementing More Detailed Power Predictions)
Mountziaris, T. J.
· A Portfolio Model for Siting Offshore Wind Farms with Economic and Environmental Objectives, Zana Cranmer*, DrOff Shore Wind Farm Siting Optimization (Implementing More Detailed Power Predictions) Wayne Being able to predict the expected power output of a wind turbine and ultimately a windfarm as a whole
Power Optimization of Memoryless Wireless Media Systems with Space-Time Block Codes
Yousefi'zadeh, Homayoun
Power Optimization of Memoryless Wireless Media Systems with Space-Time Block Codes Hamid present an analytical so- lution to the problem of power control in wireless media systems with multiple- less media systems subject to a given level of Quality of Service (QoS) and an available bit rate. Our
OPTIMIZED ENERGY ALLOCATION IN BATTERY POWERED IMAGE SENSOR Chao Yu, Gaurav Sharma
Sharma, Gaurav
OPTIMIZED ENERGY ALLOCATION IN BATTERY POWERED IMAGE SENSOR NETWORKS Chao Yu, Gaurav Sharma is obtained by deploying wireless, battery-powered image sensors. Each sensor camera provides coverage over investigate energy allocation strategies in image sensor networks for the purpose of maximizing the network
The Opportunity Process for Optimal Consumption and Investment with Power Utility
Nutz, Marcel
The Opportunity Process for Optimal Consumption and Investment with Power Utility Marcel Nutz ETH: November 24, 2009. This Version: May 31, 2010. Abstract We study the utility maximization problem for power utility ran- dom elds in a semimartingale nancial market, with and without intermediate consumption
Thermal-Aware Performance Optimization in Power Constrained Heterogeneous Data Centers
Maciejewski, Anthony A.
Thermal-Aware Performance Optimization in Power Constrained Heterogeneous Data Centers Abdulla M of data centers has been increasing at a rapid rate over the past few years. Many of these data centers experience physical limitations on the power needed to run the data center. This paper attempts to maximize
Temperature-Aware Dynamic Resource Provisioning in a Power-Optimized Datacenter
Pedram, Massoud
, resource provisioning, energy efficient, power optimization, temperature aware I. INTRODUCTION Cloud-wide power and thermal management (PTM) solutions that improve the energy efficiency of the datacenters and sustainable energy-efficiency curve, this paper seeks to advance the technology of energy-efficient
Optimal Power Procurement and Demand Response with Quality-of-Usage Guarantees
Huang, Longbo
1 Optimal Power Procurement and Demand Response with Quality-of-Usage Guarantees Longbo Huang, Jean the utility company to jointly perform power procurement and demand response so as to maximize the social are the inte- gration of renewable energy technologies [1] and the design of efficient user demand-response
Low Power Optimization Technique for BDD Mapped Circuits Per Lindgren Mikael Kerttu Mitch Thornton
Thornton, Mitchell
consumption is an important design constraint for circuits used in portable devices. The switching activity. The design of low power consumption circuits can allow for the production of devices that operate longer costs. These facts motivate designers to place emphasis on optimization for low power dissipation
Efficiency Optimization for a Power Factor Correction (PFC) Rectifier with Gallium Nitride
Paderborn, Universität
and utilized to identify the best design by numeric optimization of switching frequency, number of turns) and to increase the power density. Despite of the comparable low switching losses of GaN transistors circuit that achieves negative voltage at switch-off with a unipolar power supply is described in Section
A Design Methodology for Domain-Optimized Power-Ecient Supercomputing
California at Berkeley, University of
1/29 A Design Methodology for Domain-Optimized Power-Ecient Supercomputing Marghoob Mohiyuddin, Nov 19, 2009 #12;2/29 Takeaway HW/SW co-tuning as a new approach to HW design Applied the new approach power-ecient Intel Core2 sc: 15W@1000 MHz Tensilica XTensa DP: .09W@600 MHz Typical HW design space
Utility Optimal Scheduling in Energy Cooperation Networks Powered by Renewable Energy
Utility Optimal Scheduling in Energy Cooperation Networks Powered by Renewable Energy Congshi Hu the problem of energy and data control in energy cooperation networks powered by renewable energy Stations (BSs) with renewable energy has been proved technically feasible [1]. However, the harvested
Lopez Hernandez, Henry De Jesus
2004-11-15
This thesis presents a methodology based on Proppant Number approach for optimal fracture treatment design of natural gas wells considering non-Darcy flow effects in the design process. Closure stress is taken into account, ...
Smart Grid Application of Optimal Transmission Switching
Ferris, Michael C.
;6 Introduction continued Electric Transmission Network Flow Problem Optimal Power Flow (OPF) AlternatingSmart Grid Application of Optimal Transmission Switching By, Kory W. Hedman, et al.* University (Professor, UC Berkeley) #12;2 Motivation Co-optimize transmission topology and generation dispatch
Designing Optimal Heat and Power Systems for Industrial Processes
Rutkowski, M. A.; Witherell, W. D.
1988-01-01
. It must facilitate understanding the tradeoffs among the components of the heat and power system including steam generation, furnaces used for process heating, steam and gas turbines, heat exchange networks, heat pumps, refrigeration systems, and purchased...
Artificial Neural Network for Optimized Power System Management
OLeary, Daniel Albert
2015-01-01
and businesses with solar panels and wind turbines). MostMany homes now have solar panels that produce power, anda solar tracker, six solar panels, a computer, and several
Artificial Neural Network for Optimized Power System Management
OLeary, Daniel Albert
2015-01-01
sources, wind and solar, and one consumption model, theto power lines that run to one solar panel on the solarsolar energy production is lowest, and most easily predicted • Sunrise - one
Artificial Neural Network for Optimized Power System Management
OLeary, Daniel Albert
2015-01-01
to improve solar and wind forecasts. Further, weather dataone-third of a kWh. Wind data forecasts based on wind speedwind power models presented here, with the potential of improving forecast
Adaptive primary side control for a wireless power transfer optimization
Bogoda, Thilani Imanthika Dissanayake
2012-01-01
A resonant inductive wireless power transfer system, consisting of a primary (transmitter) circuit and secondary (receiver) circuit, was designed and implemented. This document also contains a novel indirect feedback method ...
Optimal Power Allocation in Distributed Sensing (SEN 3)
Gautam Thatte; Urbashi Mitra
2006-01-01
the star topology The received signal at the fusion centerfusion center (FC) – P i is power gain factor, Figure 1: Different generic topologies considered for distributed parameter estimation: linear, star
Free Flow Power Partners to Improve Hydrokinetic Turbine Performance...
as the device performed as expected, with no discernible harm to river-dwelling fish. Free Flow has also completed preliminary designs of utility-scale installations at a...
A three phase load flow algorithm for Shipboard Power Systems
Medina-Calder?on, M?onica M
2003-01-01
-Seidel and/or Newton Raphson techniques, were primarily developed for transmission system analysis. Distribution load flow analysis must incorporate its unique characteristics such as unbalanced loads, distributed loads, radial network structure, and one...
Compatibility Study of Compile-Time Optimizations for Power and Reliability
systems performance. However, for a wide range of today's power restricted, battery oper- ated embedded, reliability is the most significant design issue. Moreover, the limited battery capacities of such devices, the instruction flow at run- time can be adjusted to achieve a desirable trade-off between reliability, power
Analysis of operating data related to power and flow distribution in a PWR
Herbin, Henry Christophe
1974-01-01
The analysis of the effects of the uncertainties associated with temperature and power measurements in the Connecticut Yankee Reactor leads to the evaluation of the uncertainty associated with the effective flow factor. ...
Assessment of microwave power flow for reflectometry measurements in tokamak plasmas
Gourdain, P-A; Peebles, W. A.
2008-01-01
of incident and reflected microwave rays for O-mode and X-Assessment of microwave power flow for reflectometryLos Angeles, CA 90095-1547 Microwave diagnostics, such as
Urgaonkar, Bhuvan
1 A Hierarchical Demand Response Framework for Data Center Power Cost Optimization Under Real for optimizing their utility bills. Our focus is on a subset of this work that carries out demand response (DR
Optimal Power Train Design of a Hybrid Refuse Collector Vehicle
Noé, Reinhold
components like an electrical machine, an energy storage, etc. In order to exploit full potential is possible with most of hybrid electric vehicles, promises significant fuel saving. In addition. Apart from fuel savings, an electrically powered collec- tor unit allows noise reduction
Power Optimization in Fault-Tolerant Mobile Ad Hoc Networks
Grosu, Radu
devices that communicate over wireless links. Mobile devices are typically powered by batteries applications [3] [4] [5] [6] need sensor nodes to be mobile making such networks similar to MANETS. However, embedded devices and impracticality of recharging batteries. Thus, mobile sensor networks make
Two-Stage Robust Power Grid Optimization Problem
2011-01-02
transmission capacity limits for a given planning horizon (e.g., one week) ... power market was studied in [22], and to estimate the potential contribution of demand flexibility ... Integration in the Liberalised Electricity Markets (WILMAR) model [1]. ... literature, such as inventory theory [8, 9], network design [2], and lot-
Method of optimizing performance of Rankine cycle power plants
Pope, William L. (Walnut Creek, CA); Pines, Howard S. (El Cerrito, CA); Doyle, Padraic A. (Oakland, CA); Silvester, Lenard F. (Richmond, CA)
1982-01-01
A method for efficiently operating a Rankine cycle power plant (10) to maximize fuel utilization efficiency or energy conversion efficiency or minimize costs by selecting a turbine (22) fluid inlet state which is substantially in the area adjacent and including the transposed critical temperature line (46).
Partial Gating Optimization for Power Reduction During Test Application
Tehranipoor, Mohammad
and energy consumption self testing of portable devices is rendered impractical. For all these reasons. INTRODUCTION Power consumption during testing has become an impor- tant issue in modern day designs consumption is especially important in today's chips, where larger numbers of transistors are packed
Stanford University
*jkpark11@stanford.edu; phone 1 512 917 7751. A Bayesian optimization approach for wind farm power-free optimization algorithm to improve the total wind farm power production in a cooperative game framework. Conventionally, for a given wind condition, an individual wind turbine maximizes its own power production without
Oren, Shmuel S.
that is more controllable and flexible. The full control of transmission assets are not currently built into electric network optimization models. Optimal transmission switching is a straight- forward way to leverage economics, power system reliability, power transmission control, power transmission economics. NOMENCLATURE
Optimization Studies for ISOL Type High-Powered Targets
Remec, Igor; Ronningen, Reginald Martin
2013-09-24
The research studied one-step and two-step Isotope Separation on Line (ISOL) targets for future radioactive beam facilities with high driver-beam power through advanced computer simulations. As a target material uranium carbide in the form of foils was used because of increasing demand for actinide targets in rare-isotope beam facilities and because such material was under development in ISAC at TRIUMF when this project started. Simulations of effusion were performed for one-step and two step targets and the effects of target dimensions and foil matrix were studied. Diffusion simulations were limited by availability of diffusion parameters for UCx material at reduced density; however, the viability of the combined diffusion?effusion simulation methodology was demonstrated and could be used to extract physical parameters such as diffusion coefficients and effusion delay times from experimental isotope release curves. Dissipation of the heat from the isotope-producing targets is the limiting factor for high-power beam operation both for the direct and two-step targets. Detailed target models were used to simulate proton beam interactions with the targets to obtain the fission rates and power deposition distributions, which were then applied in the heat transfer calculations to study the performance of the targets. Results indicate that a direct target, with specification matching ISAC TRIUMF target, could operate in 500-MeV proton beam at beam powers up to ~40 kW, producing ~8 1013 fission/s with maximum temperature in UCx below 2200 C. Targets with larger radius allow higher beam powers and fission rates. For the target radius in the range 9-mm to 30-mm the achievable fission rate increases almost linearly with target radius, however, the effusion delay time also increases linearly with target radius.
G Aragon-Gonzalez; A. Canales-Palma; A. Leon-Galicia; J. R. Morales-Gomez
2007-01-29
In this work we include, for the Carnot cycle, irreversibilities of linear finite rate of heat transferences between the heat engine and its reservoirs, heat leak between the reservoirs and internal dissipations of the working fluid. A first optimization of the power output, the efficiency and ecological function of an irreversible Carnot cycle, with respect to: internal temperature ratio, time ratio for the heat exchange and the allocation ratio of the heat exchangers; is performed. For the second and third optimizations, the optimum values for the time ratio and internal temperature ratio are substituted into the equation of power and, then, the optimizations with respect to the cost and effectiveness ratio of the heat exchangers are performed. Finally, a criterion of partial optimization for the class of irreversible Carnot engines is herein presented.
Aragon-Gonzalez, G; Leon-Galicia, A; Morales-Gomez, J R
2007-01-01
In this work we include, for the Carnot cycle, irreversibilities of linear finite rate of heat transferences between the heat engine and its reservoirs, heat leak between the reservoirs and internal dissipations of the working fluid. A first optimization of the power output, the efficiency and ecological function of an irreversible Carnot cycle, with respect to: internal temperature ratio, time ratio for the heat exchange and the allocation ratio of the heat exchangers; is performed. For the second and third optimizations, the optimum values for the time ratio and internal temperature ratio are substituted into the equation of power and, then, the optimizations with respect to the cost and effectiveness ratio of the heat exchangers are performed. Finally, a criterion of partial optimization for the class of irreversible Carnot engines is herein presented.
Optimization Online - Information Gap Decision Theory Based OPF ...
rabiee abbas
2015-01-03
Jan 3, 2015 ... Abstract: A method for solving the optimal power flow (OPF) problem including HVDC connected offshore wind farms is presented in this paper.
Throughput Optimal Policies for Energy Harvesting Wireless Transmitters with Non-Ideal Circuit Power
Xu, Jie
2012-01-01
Characterizing the fundamental tradeoffs for maximizing energy efficiency (EE) versus spectrum efficiency (SE) is a key problem in wireless communication. In this paper, we address this problem for a point-to-point additive white Gaussian noise (AWGN) channel with the transmitter powered solely via energy harvesting from the environment. In addition, we assume a practical on-off transmitter model with non-ideal circuit power, i.e., when the transmitter is on, its consumed power is the sum of the transmit power and a constant circuit power. Under this setup, we study the optimal transmit power allocation to maximize the average throughput over a finite horizon, subject to the time-varying energy constraint and the non-ideal circuit power consumption. First, we consider the off-line optimization under the assumption that the energy arrival time and amount are a priori known at the transmitter. Although this problem is non-convex due to the non-ideal circuit power, we show an efficient optimal solution that in g...
Voltage multi-stability in distribution grids with power flow reversal
Hung D. Nguyen; Konstantin Turitsyn
2014-07-08
High levels of penetration of distributed generation and aggressive reactive power compensation with modern power electronics may result in the reversal of active and reactive power flows in future distribution grids. The voltage stability of these operating conditions may be very different from the more traditional power consumption regime. We study the stability characteristics of distribution networks with reversed power flow. After introducing a universal algebraic approach to characterize all the solutions of the power flow equations, we show that new solutions appear in the reversed power flow regime even in the simplest three bus systems. We show that the some of these solutions are stable and the system may exhibit a phenomenon of multistability, where multiple stable equilibria co-exist at the given set of parameters, and the system may converge to an undesirable equilibrium after a disturbance. These predictions are validated with dynamic simulations of two different systems. Under certain conditions the new states are viable and may be characterized by relatively high voltages. Possible approaches towards reactive power/voltage regulation as well as permissible distributed generation capacity in future power systems are proposed and discussed in the end of the paper.
Online Optimal Control of Connected Vehicles for Efficient Traffic Flow at Merging Roads
Rios-Torres, Jackeline [ORNL; Malikopoulos, Andreas [ORNL; Pisu, Pierluigi [Clemson University
2015-01-01
This paper addresses the problem of coordinating online connected vehicles at merging roads to achieve a smooth traffic flow without stop-and-go driving. We present a framework and a closed-form solution that optimize the acceleration profile of each vehicle in terms of fuel economy while avoiding collision with other vehicles at the merging zone. The proposed solution is validated through simulation and it is shown that coordination of connected vehicles can reduce significantly fuel consumption and travel time at merging roads.
Nitinol Heat Engine power plant system installation and cost optimization
Cady, E.C.; McNichols, J.L.
1984-08-01
Nitinol Heat Engines (NHE) use a shape memory alloy of nickel and titanium to directly convert the thermal energy in hot water to mechanical power (and, through a generator, to electricity). The authors designed a commercial version of a NHE based on the thermoturbine configuration developed in prototype form under contract to the Department of Energy in 1978-1980. The operation and cost of various forms of NHE have been described previously, but the penalties and costs associated with integrating the complete NHE system into installations supplying the thermal energy have not previously been determined. They found that these costs are most important, as they will often exceed the costs of the NHE proper. However, the total installed costs are quite low and result in very economical power from waste-heat or geothermal hot-water sources.
Flow Shop Scheduling with Peak Power Consumption Constraints
2012-09-23
voltages to produce a preemptive task schedule that minimizes total energy ... since it affects the power supply and cooling technologies in the design of ...... The primary role of the two heuristic algorithms described above in our study is to
Zhou, Jijun
2001-01-01
The operation of a combined cycle cogeneration power plant system is complicated because of the complex interactions among components as well as the dynamic nature of the system. Studies of plant operation through experiments in such a sensitive...
Interline Photovoltaic (I-PV) power system - A novel concept of power flow control and management
Khadkikar, Vinod
This paper presents a new system configuration for a large-scale Photovoltaic (PV) power system with multi-line transmission/distribution networks. A PV power plant is reconfigured in a way that two adjacent power system ...
Aalborg Universitet Power flow analysis for droop controlled LV hybrid AC-DC microgrids with virtual
Vasquez, Juan Carlos
Aalborg Universitet Power flow analysis for droop controlled LV hybrid AC-DC microgrids controlled LV hybrid AC-DC microgrids with virtual impedance. In Proceedings of the IEEE Power & Energy Interlinking converter PV WT IBS DC microgrid DC microgrid AC microgrid AC Load Figure 1. Structure
Comaskey, Brian J. (Walnut Creek, CA); Ault, Earl R. (Livermore, CA); Kuklo, Thomas C. (Oakdale, CA)
2005-07-05
A high average power, low optical distortion laser gain media is based on a flowing liquid media. A diode laser pumping device with tailored irradiance excites the laser active atom, ion or molecule within the liquid media. A laser active component of the liquid media exhibits energy storage times longer than or comparable to the thermal optical response time of the liquid. A circulation system that provides a closed loop for mixing and circulating the lasing liquid into and out of the optical cavity includes a pump, a diffuser, and a heat exchanger. A liquid flow gain cell includes flow straighteners and flow channel compression.
: Joint Optimization of Charger Placement and Power Allocation for Wireless Power Transfer
Wu, Jie
, the energy-hungry battery-powered devices. It enables energy to be wirelessly transmitted from power chargers the lifetime of, and thus enhance the usability of, these battery-powered devices, solutions from different per- spectives have been proposed, including energy harvesting [1], energy conservation [2], and battery
Power flow tracing in a simplified highly renewable European electricity network
Tranberg, Bo; Rodriguez, Rolando A; Andresen, Gorm B; Schäfer, Mirko; Greiner, Martin
2015-01-01
The increasing transmission capacity needs in a future energy system raise the question how associated costs should be allocated to the users of a strengthened power grid. In contrast to straightforward oversimplified methods, a flow tracing based approach provides a fair and consistent nodal usage and thus cost assignment of transmission investments. This technique follows the power flow through the network and assigns the link capacity usage to the respective sources or sinks using a diffusion-like process, thus taking into account the underlying network structure and injection pattern. As a showcase, we apply power flow tracing to a simplified model of the European electricity grid with a high share of renewable wind and solar power generation, based on long-term weather and load data with an hourly temporal resolution.
Optimizing the Configuration and Control of a Novel Human-Powered Energy Harvesting System
Potkonjak, Miodrag
. For example, a hydraulic-amplified piezo-electric based foot-strike energy harvesting system was proposedOptimizing the Configuration and Control of a Novel Human-Powered Energy Harvesting System Vishwa and energy efficient design, sampling, processing and communication techniques emerge to counter these issues
Optimizing Datacenter Power with Memory System Levers for Guaranteed Quality-of-Service
Balasubramonian, Rajeev
Optimizing Datacenter Power with Memory System Levers for Guaranteed Quality-of-Service Kshitij scenario in datacenters. Co- location, while maintaining Quality-of-Service (QoS) for each application is a complex problem that is fast gaining rele- vance for these datacenters. The problem is exacerbated
Optimal Frequencies for Inductive Powering of Fully Implantable Biosensors for Chronic and Elderly
De Micheli, Giovanni
Optimal Frequencies for Inductive Powering of Fully Implantable Biosensors for Chronic and Elderly wirelessly to implanted biosensors. A system with an external transmitting coil located into a skin patch and a receiving coil embedded into a fully implanted biosensor is simulated. The effects of the geometry
Optimal Power Allocation and Load Distribution for Multiple Heterogeneous Multicore Server
Stojmenovic, Ivan
clouds and data centers, the aggregated performance of the cloud of clouds can be optimized by load processor, power allocation, queuing model, response time Ç 1 INTRODUCTION 1.1 Motivation CLOUD computing, software, databases, information, and all re- sources are provided to users on-demand. In a data center
Journal of Power Sources 142 (2005) 184193 Modeling and optimization of catalytic partial oxidation
Daraio, Chiara
2005-01-01
of a micro-reformer for a fuel cell unit based on catalytic partial oxidation using a systematic numerical is around 80% is identified. © 2004 Elsevier B.V. All rights reserved. Keywords: Catalytic partial oxidationJournal of Power Sources 142 (2005) 184193 Modeling and optimization of catalytic partial
LQ Optimal Control of Wind Turbines in Hybrid Power Systems N.A. Cutululis1
LQ Optimal Control of Wind Turbines in Hybrid Power Systems N.A. Cutululis1 , H. Bindner1 , I. Munteanu2 , A. Bratcu2 , E. Ceanga2 , P. Soerensen1 1 Risø National Laboratory, Denmark Wind Energy Systems, Faculty of Electrical Engineering, "Dunrea de Jos" University of Galati, Abstract: Wind diesel
JOINT OPTIMIZATION OF SOURCE CODING AND POWER ALLOCATION IN SENSOR Jun Yuan and Wei Yu
Yu, Wei
JOINT OPTIMIZATION OF SOURCE CODING AND POWER ALLOCATION IN SENSOR NETWORKS Jun Yuan and Wei Yu and correlated, the network performance becomes a complicated and non-separable function of all individual data allocation in a sensor network. We model the sensor network from an information theoretical perspective
HypoEnergy: Hybrid supercapacitor-battery power-supply optimization for Energy efficiency
HypoEnergy: Hybrid supercapacitor-battery power-supply optimization for Energy efficiency Azalia that leaks energy. Evaluations on iPhone load measurements demonstrate the efficiency and applicability, and (iii) a much higher charge and discharge efficiency. However, while the energy density
Highly Optimized Tolerance: A Mechanism for Power Laws in Designed Systems J. M. Carlson
Carlson, Jean
Highly Optimized Tolerance: A Mechanism for Power Laws in Designed Systems J. M. Carlson Department, California Institute of Technology, Pasadena, CA 91125 (April 27, 1999) We introduce a mechanism, either through natural selection or engineering design, to provide robust performance despite uncertain
An Integrated Approach for Optimal Coordination of Wind Power and Hydro Pumping Storage
Paris-Sud XI, Université de
1 An Integrated Approach for Optimal Coordination of Wind Power and Hydro Pumping Storage Edgardo D hydro station with pumping capacity. Economic profits and better operational features can be obtained of hydro storage used and the market characteristics and several options are compared in this study
Flight Path and Wing Optimization of Lithium-Air Battery Powered Passenger Aircraft
Alonso, Juan J.
in the design of electrically-driven aircraft, particularly in the case of fuel cells and batteries.57 One to implement vis. a vis. fuel cells, in particular, liquid hydrogen fuel cells. However, present-day batteryFlight Path and Wing Optimization of Lithium-Air Battery Powered Passenger Aircraft J. Michael Vegh
Online Capable Optimized Planning of Power Split in a Hybrid Energy Storage System
Noé, Reinhold
Online Capable Optimized Planning of Power Split in a Hybrid Energy Storage System Karl Stephan, D-33095 Paderborn (Germany) {stille,romaus,boecker}@lea.upb.de Abstract--A hybrid energy storage system is an energy storage consisting of more than one type of energy storages combining
Optimal Power Control for Energy Harvesting Transmitters in an Interference Channel
Yener, Aylin
of energy harvesting wireless communi- cation devices in the near future. The design principles of energy it inapplicable for nodes with limited battery capacity. An alternative approach enforcing strict energyOptimal Power Control for Energy Harvesting Transmitters in an Interference Channel Kaya
Interconnection networks synthesis and optimization
Zhu, Yi
2008-01-01
Synthesis and Optimization . . . . . . . . . . .1.Wire Style Optimization . . . . . . . . . . . . . B. PowerSynthesis and Optimization . 1. Overview . . . . . . . . . .
Sum-Rate Optimal Power Policies for Energy Harvesting Transmitters in an Interference Channel
Tutuncuoglu, Kaya
2011-01-01
This paper considers a two-user Gaussian interference channel with energy harvesting transmitters. Different than conventional battery powered wireless nodes, energy harvesting transmitters have to adapt transmission to availability of energy at a particular instant. In this setting, the optimal power allocation problem to maximize sum throughput within a given deadline is formulated. The convergence of the proposed iterative coordinate descent method for the problem is proved and the short-term throughput maximizing offline power allocation policy is found. Examples for interference regions with known sum capacities are given with directional water-filling interpretations when possible. Next, stochastic data arrivals are addressed. Finally online and/or distributed near-optimal policies are proposed. Performance of the proposed algorithms are demonstrated through simulations.
Stochastic optimization methods for extracting cosmological parameters from CMBR power spectra
Steen Hannestad
1999-11-17
The reconstruction of the CMBR power spectrum from a map represents a major computational challenge to which much effort has been applied. However, once the power spectrum has been recovered there still remains the problem of extracting cosmological parameters from it. Doing this involves optimizing a complicated function in a many dimensional parameter space. Therefore efficient algorithms are necessary in order to make this feasible. We have tested several different types of algorithms and found that the technique known as simulated annealing is very effective for this purpose. It is shown that simulated annealing is able to extract the correct cosmological parameters from a set of simulated power spectra, but even with such fast optimization algorithms, a substantial computational effort is needed.
Optimization of the output and efficiency of a high power cascaded arc hydrogen plasma source
Vijvers, W. A. J.; Gils, C. A. J. van; Goedheer, W. J.; Meiden, H. J. van der; Veremiyenko, V. P.; Westerhout, J.; Lopes Cardozo, N. J.; Rooij, G. J. van; Schram, D. C.
2008-09-15
The operation of a cascaded arc hydrogen plasma source was experimentally investigated to provide an empirical basis for the scaling of this source to higher plasma fluxes and efficiencies. The flux and efficiency were determined as a function of the input power, discharge channel diameter, and hydrogen gas flow rate. Measurements of the pressure in the arc channel show that the flow is well described by Poiseuille flow and that the effective heavy particle temperature is approximately 0.8 eV. Interpretation of the measured I-V data in terms of a one-parameter model shows that the plasma production is proportional to the input power, to the square root of the hydrogen flow rate, and is independent of the channel diameter. The observed scaling shows that the dominant power loss mechanism inside the arc channel is one that scales with the effective volume of the plasma in the discharge channel. Measurements on the plasma output with Thomson scattering confirm the linear dependence of the plasma production on the input power. Extrapolation of these results shows that (without a magnetic field) an improvement in the plasma production by a factor of 10 over where it was in van Rooij et al. [Appl. Phys. Lett. 90, 121501 (2007)] should be possible.
Solar Power Ramp Events Detection Using an Optimized Swinging Door Algorithm: Preprint
Cui, Mingjian; Zhang, Jie; Florita, Anthony; Hodge, Bri-Mathias; Ke, Deping; Sun, Yuanzhang
2015-08-07
Solar power ramp events (SPREs) are those that significantly influence the integration of solar power on non-clear days and threaten the reliable and economic operation of power systems. Accurately extracting solar power ramps becomes more important with increasing levels of solar power penetrations in power systems. In this paper, we develop an optimized swinging door algorithm (OpSDA) to detection. First, the swinging door algorithm (SDA) is utilized to segregate measured solar power generation into consecutive segments in a piecewise linear fashion. Then we use a dynamic programming approach to combine adjacent segments into significant ramps when the decision thresholds are met. In addition, the expected SPREs occurring in clear-sky solar power conditions are removed. Measured solar power data from Tucson Electric Power is used to assess the performance of the proposed methodology. OpSDA is compared to two other ramp detection methods: the SDA and the L1-Ramp Detect with Sliding Window (L1-SW) method. The statistical results show the validity and effectiveness of the proposed method. OpSDA can significantly improve the performance of the SDA, and it can perform as well as or better than L1-SW with substantially less computation time.
Optimization Under Uncertainty for Water Consumption in a Pulverized Coal Power Plant
Juan M. Salazara; Stephen E. Zitney; Urmila M. Diwekara
2009-01-01
Pulverized coal (PC) power plants are widely recognized as major water consumers whose operability has started to be affected by drought conditions across some regions of the country. Water availability will further restrict the retrofitting of existing PC plants with water-expensive carbon capture technologies. Therefore, national efforts to reduce water withdrawal and consumption have been intensified. Water consumption in PC plants is strongly associated to losses from the cooling water cycle, particularly water evaporation from cooling towers. Accurate estimation of these water losses requires realistic cooling tower models, as well as the inclusion of uncertainties arising from atmospheric conditions. In this work, the cooling tower for a supercritical PC power plant was modeled as a humidification operation and used for optimization under uncertainty. Characterization of the uncertainty (air temperature and humidity) was based on available weather data. Process characteristics including boiler conditions, reactant ratios, and pressure ratios in turbines were calculated to obtain the minimum water consumption under the above mentioned uncertainties. In this study, the calculated conditions predicted up to 12% in reduction in the average water consumption for a 548 MW supercritical PC power plant simulated using Aspen Plus. Optimization under uncertainty for these large-scale PC plants cannot be solved with conventional stochastic programming algorithms because of the computational expenses involved. In this work, we discuss the use of a novel better optimization of nonlinear uncertain systems (BONUS) algorithm which dramatically decreases the computational requirements of the stochastic optimization.
Optimization under Uncertainty for Water Consumption in a Pulverized Coal Power Plant
Juan M. Salazar; Stephen E. Zitney; Urmila Diwekar
2009-01-01
Pulverized coal (PC) power plants are widely recognized as major water consumers whose operability has started to be affected by drought conditions across some regions of the country. Water availability will further restrict the retrofitting of existing PC plants with water-expensive carbon capture technologies. Therefore, national efforts to reduce water withdrawal and consumption have been intensified. Water consumption in PC plants is strongly associated to losses from the cooling water cycle, particularly water evaporation from cooling towers. Accurate estimation of these water losses requires realistic cooling tower models, as well as the inclusion of uncertainties arising from atmospheric conditions. In this work, the cooling tower for a supercritical PC power plant was modeled as a humidification operation and used for optimization under uncertainty. Characterization of the uncertainty (air temperature and humidity) was based on available weather data. Process characteristics including boiler conditions, reactant ratios, and pressure ratios in turbines were calculated to obtain the minimum water consumption under the above mentioned uncertainties. In this study, the calculated conditions predicted up to 12% in reduction in the average water consumption for a 548 MW supercritical PC power plant simulated using Aspen Plus. Optimization under uncertainty for these large-scale PC plants cannot be solved with conventional stochastic programming algorithms because of the computational expenses involved. In this work, we discuss the use of a novel better optimization of nonlinear uncertain systems (BONUS) algorithm which dramatically decreases the computational requirements of the stochastic optimization.
The Flow of Power-Law Fluids in Axisymmetric Corrugated Tubes
Sochi, Taha
2010-01-01
In this article we present an analytical method for deriving the relationship between the pressure drop and flow rate in laminar flow regimes, and apply it to the flow of power-law fluids through axially-symmetric corrugated tubes. The method, which is general with regards to fluid and tube shape within certain restrictions, can also be used as a foundation for numerical integration where analytical expressions are hard to obtain due to mathematical or practical complexities. Five converging-diverging geometries are used as examples to illustrate the application of this method.
The Flow of Power-Law Fluids in Axisymmetric Corrugated Tubes
Taha Sochi
2010-06-13
In this article we present an analytical method for deriving the relationship between the pressure drop and flow rate in laminar flow regimes, and apply it to the flow of power-law fluids through axially-symmetric corrugated tubes. The method, which is general with regards to fluid and tube shape within certain restrictions, can also be used as a foundation for numerical integration where analytical expressions are hard to obtain due to mathematical or practical complexities. Five converging-diverging geometries are used as examples to illustrate the application of this method.
Nanorod Niobium Oxide as Powerful Catalysts for an All Vanadium Redox Flow Battery
Li, Bin; Gu, Meng; Nie, Zimin; Wei, Xiaoliang; Wang, Chong M.; Sprenkle, Vincent L.; Wang, Wei
2014-01-01
Graphite felts (GFs), as typical electrode materials for all vanadium redox flow batteries (VRBs), limit the cell operation to low current density because of their poor kinetic reversibility and electrochemical activity. Here, in order to address this issue we report an electrocatalyst, Nb2O5, decorating the surface of GFs to reduce the activation barrier for redox conversion. Nb2O5 nanofibers with monoclinic phases are synthesized by hydrothermal method and deposited on GFs, which is confirmed to have catalytic effects towards redox couples of V(II)/V(III) at the negative side and V(IV)/V(V) at the positive side, and thus applied in both electrodes of VRB cells. Due to the low conductivity of Nb2O5, the performance of electrodes heavily depends on the nano size and uniform distribution of catalysts on GFs surfaces. The addition of the water-soluble compounds containing W element into the precursor solutions facilitates the precipitation of nanofibers on the GFs. Accordingly, an optimal amount of W-doped Nb2O5 nanofibers with weaker agglomeration and better distribution on GFs surfaces are obtained, leading to significant improvement of the electrochemical performances of VRB cells particularly under the high power operation. The corresponding energy efficiency is enhanced by 10.7 % under the operation of high charge/discharge current density (150 mA•cm-2) owing to faster charge transfer as compared with that without catalysts. These results suggest that Nb2O5 based nanofibers-decorating GFs hold great promise as high-performance electrodes for VRB applications.
Optimal operation of a concurrent-flow corn dryer with a drying heat pump using superheated steam
Moraitis, C.S. [Systelligence Consultants and Research Associates, Volos (Greece); Akritidis, C.B. [Dept. of Hydraulics and Agricultural Engineering, Thessaloniki (Greece)
1998-07-01
A numerical model of a concurrent-flow dryer of corn using superheated steam as drying medium is solved applying a shooting technique, so as to satisfy boundary conditions imposed by the optimal design of a drying heat pump. The drying heat pump is based on the theory of minimum energy cycles. The solution of the model proves the applicability of the heat pump to a concurrent-flow dryer, achieving a Specific Energy Consumption as low as 1080 kJ/kg.
Drouilhet, S. M.
1999-07-29
This paper is intended as an introduction to some of the control challenges faced by developers of high penetration wind-diesel systems, with a focus on the management of power flows in order to achieve precise regulation of frequency and voltage in the face of rapidly varying wind power input and load conditions. The control algorithms presented herein are being implemented in the National Renewable Energy Laboratory (NREL) high penetration wind-diesel system controller that will be installed in the village of Wales, Alaska, in early 2000.
Systems studies and optimization of the ARIES-CS power plant
Lyon, J. [Oak Ridge National Laboratory (ORNL); Ku, L. P. [Princeton Plasma Physics Laboratory (PPPL); El-GuebalyUniv. Wisco, L. [University of Wisconsin; Bromberg, L. [Massachusetts Institute of Technology (MIT); Wagner, L. [The Boeing Co., St. Louis, MO; Zarnstorff, M. C. [Princeton Plasma Physics Laboratory (PPPL)
2008-01-01
stellarator systems/optimization code is used to optimize the ARIES-CS fusion power plant parameters for minimum cost of electricity subject to a large number of physics, engineering, and in-vessel component constraints for a compact stellarator configuration. Different physics models, reactor component models, and costing algorithms are used to test sensitivities to models and assumptions. The most important factors determining the size of the fusion power core are the allowable neutron and radiative power fluxes to the wall, the distance needed between the edge of the plasma and the nonplanar magnetic field coils for the intervening components, and an adequate tritium breeding ratio. The magnetic field and coil parameters are determined from both plasma performance and constraints on the Nb3Sn superconductor. The same costing approach and algorithms used in previous ARIES studies are used with updated material costs. The result is a compact stellarator reactor with a major radius close to that of tokamaks. A one-dimensional power balance code is used to study the path to ignition and the effect of different plasma and confinement assumptions on plasma performance for the reference plasma and coil configuration. A number of variations are studied that affect the size and cost of the fusion power core: maximum field at the coils, component cost penalties, a different blanket and shield approach, alternative plasma and coil configurations, etc. Comparisons are made with some earlier ARIES power plant studies. A number of issues for the development of compact quasi-axisymmetric stellarators are identified.
Nir, Vincent Le; Verlinden, Jan; Guenach, Mamoun
2010-01-01
In xDSL systems, crosstalk can be separated into two categories, namely in-domain crosstalk and out-of-domain crosstalk. In-domain crosstalk is also refered to as self crosstalk. Out-of-domain crosstalk is crosstalk originating from outside the multi-pair system and is also denoted as external noise (alien crosstalk, radio frequency interference,...). While self crosstalk in itself can easily be canceled by a linear detector like the ZF detector, the presence of external noise requires a more advanced processing. Coordination between transmitters and receivers enables the self crosstalk and the external noise to be mitigated using MIMO signal processing, usually by means of a whitening ï¬lter and SVD. In this paper, we investigate the problem of ï¬nding the optimal power allocation in MIMO xDSL systems in the presence of self crosstalk and external noise. Optimal Tx/Rx structures and power allocation algorithms will be devised under practical limitations from xDSL systems, namely per-modem total power...
Kusiak, Andrew
1 Abstract--A bi-objective optimization model of power and power changes generated by a wind the industrial data collected at a wind farm. The models and constraints derived from the data were integrated prediction, power ramp rate, data mining, wind turbine operation strategy, generator torque, blade pitch
Development of an entrained flow gasifier model for process optimization study
Biagini, E.; Bardi, A.; Pannocchia, G.; Tognotti, L. [Consorzio Pisa Ric, Pisa (Italy). Div Energia Ambiente
2009-10-15
Coal gasification is a versatile process to convert a solid fuel in syngas, which can be further converted and separated in hydrogen, which is a valuable and environmentally acceptable energy carrier. Different technologies (fixed beds, fluidized beds, entrained flow reactors) are used, operating under different conditions of temperature, pressure, and residence time. Process studies should be performed for defining the best plant configurations and operating conditions. Although 'gasification models' can be found in the literature simulating equilibrium reactors, a more detailed approach is required for process analysis and optimization procedures. In this work, a gasifier model is developed by using AspenPlus as a tool to be implemented in a comprehensive process model for the production of hydrogen via coal gasification. It is developed as a multizonal model by interconnecting each step of gasification (preheating, devolatilization, combustion, gasification, quench) according to the reactor configuration, that is in entrained flow reactor. The model removes the hypothesis of equilibrium by introducing the kinetics of all steps and solves the heat balance by relating the gasification temperature to the operating conditions. The model allows to predict the syngas composition as well as quantity the heat recovery (for calculating the plant efficiency), 'byproducts', and residual char. Finally, in view of future works, the development of a 'gasifier model' instead of a 'gasification model' will allow different reactor configurations to be compared.
Neubauer, J.; Simpson, M.
2013-10-01
Commercial facility utility bills are often a strong function of demand charges -- a fee proportional to peak power demand rather than total energy consumed. In some instances, demand charges can constitute more than 50% of a commercial customer's monthly electricity cost. While installation of behind-the-meter solar power generation decreases energy costs, its variability makes it likely to leave the peak load -- and thereby demand charges -- unaffected. This then makes demand charges an even larger fraction of remaining electricity costs. Adding controllable behind-the-meter energy storage can more predictably affect building peak demand, thus reducing electricity costs. Due to the high cost of energy storage technology, the size and operation of an energy storage system providing demand charge management (DCM) service must be optimized to yield a positive return on investment (ROI). The peak demand reduction achievable with an energy storage system depends heavily on a facility's load profile, so the optimal configuration will be specific to both the customer and the amount of installed solar power capacity. We explore the sensitivity of DCM value to the power and energy levels of installed solar power and energy storage systems. An optimal peak load reduction control algorithm for energy storage systems will be introduced and applied to historic solar power data and meter load data from multiple facilities for a broad range of energy storage system configurations. For each scenario, the peak load reduction and electricity cost savings will be computed. From this, we will identify a favorable energy storage system configuration that maximizes ROI.
Animation and Visualization of Spot Prices via Quadratized Power Flow Analysis
Animation and Visualization of Spot Prices via Quadratized Power Flow Analysis A. P. Sakis@attbi.com Abstract This paper presents a new model for efficient calculation of spot prices and animation and visualization of spot price evolution as the system operating point is changing. The computational method
Primary pump power as a measure of fluid density during bubbly two-phase flow. [PWR
McCreery, G.E.; Linebarger, J.H.; Koske, J.E.
1983-01-01
A nuclear plant operator requires other information on reactor coolant system inventory besides just pressurizer liquid level, which often disappears or gives ambiguous indications during a loss-of-coolant accident. Erroneous instrument readings during the Three Mile Island and Ginna accidents are examples. Pump power or current is shown in this paper to provide an additional source of inventory information. When the reactor coolant pumps are operating, it allows the operator to make decisions about the advisability of continued pump- and safety-injection operation. The inventory information is provided by a simple method of calculating fluid density for bubbly two-phase flow by relating pump power or current to fluid density. The calculational method is derived and compared with data in this paper. Calculations using the method agree well with the measured experimental data with increasing void fraction, until the flow transitions from bubbly to partially stratified churn flow within the pump.
Optimal Power Procurement and Demand Response with Quality-of-Usage Guarantees
Huang, Longbo; Ramchandran, Kannan
2011-01-01
In this paper, we propose a general operating scheme which allows the utility company to jointly perform power procurement and demand response so as to maximize the social welfare. Our model takes into consideration the effect of the renewable energy and the multi-stage feature of the power procurement process. It also enables the utility company to provide quality-of-usage (QoU) guarantee to the power consumers, which ensures that the average power usage level meets the target value for each user. To maximize the social welfare, we develop a low-complexity algorithm called the \\emph{welfare maximization algorithm} (WMA), which performs joint power procurement and dynamic pricing. WMA is constructed based on a two-timescale Lyapunov optimization technique. We prove that WMA achieves a close-to-optimal utility and ensures that the QoU requirement is met with bounded deficit. WMA can be implemented in a distributed manner and is robust with respect to system dynamics uncertainty.
HHFW Power Flow Along Magnetic Field Lines In The Scrape-off Layer of NSTX
Rory Perkins, et. al.
2012-02-27
A significant fraction of high-harmonic fast-wave (HHFW) power applied to NSTX can be lost to the scrape-off layer (SOL) and deposited in bright and hot spirals on the divertor rather than in the core plasma. We show that the HHFW power flows to these spirals along magnetic field lines passing through the SOL in front of the antenna, implying that the HHFW power couples across the entire width of the SOL rather than mostly at the antenna face. This result will help guide future efforts to understand and minimize these edge losses in order to maximize fast wave heating and current drive.
Microsoft PowerPoint - P&RA CoP EPA optimization Biggs final...
Office of Environmental Management (EM)
National Optimization Strategy to meet goals * Goal: Expand optimization throughout pipeline * Goal: Increase number of sites optimized * Goal: Expand optimization resource...
Mishchenko, Alan
switching activity of signals in large sequential designs. o PowerMap uses switching activity to make better for power-aware logic optimization: o SimSwitch is an efficient sequential simulator for estimating With the increase of the design size and the reduction of feature size, power minimization becomes an important
Hu, Jiang
, APRIL 2008 Power Grid Analysis and Optimization Using Algebraic Multigrid Cheng Zhuo, Student Member of power grid analy- sis and optimization techniques, all of which are based on the algebraic of reducing the problem size for power grid analysis and optimization. Next, with the proposed reduction
Edwin A. Harvego; Michael G. McKellar
2011-05-01
There have been a number of studies involving the use of gases operating in the supercritical mode for power production and process heat applications. Supercritical carbon dioxide (CO2) is particularly attractive because it is capable of achieving relatively high power conversion cycle efficiencies in the temperature range between 550°C and 750°C. Therefore, it has the potential for use with any type of high-temperature nuclear reactor concept, assuming reactor core outlet temperatures of at least 550°C. The particular power cycle investigated in this paper is a supercritical CO2 Recompression Brayton Cycle. The CO2 Recompression Brayton Cycle can be used as either a direct or indirect power conversion cycle, depending on the reactor type and reactor outlet temperature. The advantage of this cycle when compared to the helium Brayton Cycle is the lower required operating temperature; 550°C versus 850°C. However, the supercritical CO2 Recompression Brayton Cycle requires an operating pressure in the range of 20 MPa, which is considerably higher than the required helium Brayton cycle operating pressure of 8 MPa. This paper presents results of analyses performed using the UniSim process analyses software to evaluate the performance of the supercritical CO2 Brayton Recompression Cycle for different reactor outlet temperatures. The UniSim model assumed a 600 MWt reactor power source, which provides heat to the power cycle at a maximum temperature of between 550°C and 750°C. The UniSim model used realistic component parameters and operating conditions to model the complete power conversion system. CO2 properties were evaluated, and the operating range for the cycle was adjusted to take advantage of the rapidly changing conditions near the critical point. The UniSim model was then optimized to maximize the power cycle thermal efficiency at the different maximum power cycle operating temperatures. The results of the analyses showed that power cycle thermal efficiencies in the range of 40 to 50% can be achieved.
A thermodynamic hypothesis regarding optimality principles for flow processes in geosystems
Liu, Hui-Hai
2015-01-01
basin has larger energy than the downstream water. Thus, thea way that the energy expenditure rate for water flow shouldhypothesis. The energy expenditure rate, EE, for water flow
Optimization of electrode characteristics for the Br2/H2 redox flow cell
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Tucker, Michael C.; Cho, Kyu Taek; Weber, Adam Z.; Lin, Guangyu; Nguyen, Trung V.
2014-10-01
The Br2/H2 redox flow cell shows promise as a high-power, low-cost energy storage device. The effect of various aspects of material selection, processing, and assembly of electrodes on the operation, performance, and efficiency of the system is determined. In particular, (+) electrode thickness, cell compression, hydrogen pressure, and (?) electrode architecture are investigated. Increasing hydrogen pressure and depositing the (?) catalyst layer on the membrane instead of on the carbon paper backing layers have a large positive impact on performance, enabling a limiting current density above 2 A cm?2 and a peak power density of 1.4 W cm?2. Maximum energymore »efficiency of 79 % is achieved. In addition, the root cause of limiting-current behavior in this system is elucidated, where it is found that Br? reversibly adsorbs at the Pt (?) electrode for potentials exceeding a critical value, and the extent of Br? coverage is potential-dependent. This phenomenon limits maximum cell current density and must be addressed in system modeling and design. These findings are expected to lower system cost and enable higher efficiency.« less
Optimization of electrode characteristics for the Br2/H2 redox flow cell
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Tucker, Michael C.; Cho, Kyu Taek; Weber, Adam Z.; Lin, Guangyu; Nguyen, Trung V.
2014-10-01
The Br2/H2 redox flow cell shows promise as a high-power, low-cost energy storage device. The effect of various aspects of material selection, processing, and assembly of electrodes on the operation, performance, and efficiency of the system is determined. In particular, (+) electrode thickness, cell compression, hydrogen pressure, and (?) electrode architecture are investigated. Increasing hydrogen pressure and depositing the (?) catalyst layer on the membrane instead of on the carbon paper backing layers have a large positive impact on performance, enabling a limiting current density above 2 A cm?2 and a peak power density of 1.4 W cm?2. Maximum energy efficiency of 79 % is achieved. In addition, the root cause of limiting-current behavior in this system is elucidated, where it is found that Br? reversibly adsorbs at the Pt (?) electrode for potentials exceeding a critical value, and the extent of Br? coverage is potential-dependent. This phenomenon limits maximum cell current density and must be addressed in system modeling and design. These findings are expected to lower system cost and enable higher efficiency.
Optimization of electrode characteristics for the Br?/H? redox flow cell
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Tucker, Michael C.; Cho, Kyu Taek; Weber, Adam Z.; Lin, Guangyu; Van Nguyen, Trung
2014-10-17
The Br?/H? redox flow cell shows promise as a high-power, low-cost energy storage device. The effect of various aspects of material selection, processing, and assembly of electrodes on the operation, performance, and efficiency of the system is determined. In particular, (+) electrode thickness, cell compression, hydrogen pressure, and (–) electrode architecture are investigated. Increasing hydrogen pressure and depositing the (–) catalyst layer on the membrane instead of on the carbon-paper backing layers have a large positive impact on performance, enabling a limiting current density above 2 A cm-2 and a peak power density of 1.4 W cm-2. Maximum energy efficiencymore »of 79% is achieved. In addition, the root cause of limiting-current behavior in this system is elucidated, where it is found that Br- reversibly adsorbs at the Pt (–) electrode for potentials exceeding a critical value, and the extent of Br- coverage is potential-dependent. This phenomenon limits maximum cell current density and must be addressed in system modeling and design. These findings are expected to lower system cost and enable higher efficiency.« less
Optimization of electrode characteristics for the Br?/H? redox flow cell
Tucker, Michael C.; Cho, Kyu Taek; Weber, Adam Z.; Lin, Guangyu; Van Nguyen, Trung
2015-01-01
The Br?/H? redox flow cell shows promise as a high-power, low-cost energy storage device. The effect of various aspects of material selection, processing, and assembly of electrodes on the operation, performance, and efficiency of the system is determined. In particular, (+) electrode thickness, cell compression, hydrogen pressure, and (–) electrode architecture are investigated. Increasing hydrogen pressure and depositing the (–) catalyst layer on the membrane instead of on the carbon-paper backing layers have a large positive impact on performance, enabling a limiting current density above 2 A cm^{-2 }and a peak power density of 1.4 W cm^{-2}. Maximum energy efficiency of 79% is achieved. In addition, the root cause of limiting-current behavior in this system is elucidated, where it is found that Br^{-} reversibly adsorbs at the Pt (–) electrode for potentials exceeding a critical value, and the extent of Br^{-} coverage is potential-dependent. This phenomenon limits maximum cell current density and must be addressed in system modeling and design. These findings are expected to lower system cost and enable higher efficiency.
Optimization of electrode characteristics for the Br-2/H-2 redox flow cell
Tucker, MC; Cho, KT; Weber, AZ; Lin, GY; Nguyen, TV
2014-10-17
The Br-2/H-2 redox flow cell shows promise as a high-power, low-cost energy storage device. The effect of various aspects of material selection, processing, and assembly of electrodes on the operation, performance, and efficiency of the system is determined. In particular, (+) electrode thickness, cell compression, hydrogen pressure, and (-) electrode architecture are investigated. Increasing hydrogen pressure and depositing the (-) catalyst layer on the membrane instead of on the carbon paper backing layers have a large positive impact on performance, enabling a limiting current density above 2 A cm(-2) and a peak power density of 1.4 W cm(-2). Maximum energy efficiency of 79 % is achieved. In addition, the root cause of limiting-current behavior in this system is elucidated, where it is found that Br- reversibly adsorbs at the Pt (-) electrode for potentials exceeding a critical value, and the extent of Br- coverage is potential-dependent. This phenomenon limits maximum cell current density and must be addressed in system modeling and design. These findings are expected to lower system cost and enable higher efficiency.
Giles, C. Lee
1 A Hierarchical Demand Response Framework for Data Center Power Cost Optimization Under Real bills. Our focus is on a subset of this work that carries out demand response (DR) by modulating
Powell, Warren B.
-at-Risk Optimal Energy Storage Operation in the Presence of Transaction Costs Somayeh Moazeni, Member, IEEE the formulation and solution of an optimal energy storage management problem under risk consideration and transaction costs of trading energy with the power grid. The price evolves as a stochastic process, capable
Schmitz, Paul Charles
1990-01-01
RELIABILITY AND OPTIMIZATION STUDIES OF NUCLEAR AND SOLAR POWERED SYSTEMS UTILIZING A STIRLING ENGINE FOR THE SPACE STATION A Thesis by PAUL CHARLES SCHMITZ 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 1990 Major Subject: Nuclear Engineering RELIABILITY AND OPTIMIZATION STUDIES OF NUCLEAR AND SOLAR POWERED SYSTEMS UTILIZING A STIRLING ENGINE FOR THE SPACE STATION A Thesis...
Optimization Strategies for the Vulnerability Analysis of the Electric Power Grid
Pinar, A.; Meza, J.; Donde, V.; Lesieutre, B.
2007-11-13
Identifying small groups of lines, whose removal would cause a severe blackout, is critical for the secure operation of the electric power grid. We show how power grid vulnerability analysis can be studied as a mixed integer nonlinear programming (MINLP) problem. Our analysis reveals a special structure in the formulation that can be exploited to avoid nonlinearity and approximate the original problem as a pure combinatorial problem. The key new observation behind our analysis is the correspondence between the Jacobian matrix (a representation of the feasibility boundary of the equations that describe the flow of power in the network) and the Laplacian matrix in spectral graph theory (a representation of the graph of the power grid). The reduced combinatorial problem is known as the network inhibition problem, for which we present a mixed integer linear programming formulation. Our experiments on benchmark power grids show that the reduced combinatorial model provides an accurate approximation, to enable vulnerability analyses of real-sized problems with more than 10,000 power lines.
Optimization strategies for the vulnerability analysis of the electric power grid.
Meza, Juan C.; Pinar, Ali; Lesieutre, Bernard; Donde, Vaibhav
2009-03-01
Identifying small groups of lines, whose removal would cause a severe blackout, is critical for the secure operation of the electric power grid. We show how power grid vulnerability analysis can be studied as a mixed integer nonlinear programming (minlp) problem. Our analysis reveals a special structure in the formulation that can be exploited to avoid nonlinearity and approximate the original problem as a pure combinatorial problem. The key new observation behind our analysis is the correspondence between the Jacobian matrix (a representation of the feasibility boundary of the equations that describe the flow of power in the network) and the Laplacian matrix in spectral graph theory (a representation of the graph of the power grid). The reduced combinatorial problem is known as the network inhibition problem, for which we present a mixed integer linear programming formulation. Our experiments on benchmark power grids show that the reduced combinatorial model provides an accurate approximation, to enable vulnerability analyses of real-sized problems with more than 10,000 power lines.
Chang, S.L.; Lottes, S.A.; Bouillard, J.X.; Petrick, M.
1997-11-01
This report covers application of Argonne National Laboratory`s (ANL`s) computer codes to simulation and analysis of components of the magnetohydrodynamic (MHD) power train system at the Component Development and Integration Facility (CDIF). Major components of the system include a 50-MWt coal-fired, two-stage combustor and an MHD channel. The combustor, designed and built by TRW, includes a deswirl section between the first and the second-stage combustor and a converging nozzle following the second-stage combustor, which connects to the MHD channel. ANL used computer codes to simulate and analyze flow characteristics in various components of the MHD system. The first-stage swirl combustor was deemed a mature technology and, therefore, was not included in the computer simulation. Several versions of the ICOMFLO computer code were used for the deswirl section and second-stage combustor. The MGMHD code, upgraded with a slag current leakage submodel, was used for the MHD channel. Whenever possible data from the test facilities were used to aid in calibrating parameters in the computer code, to validate the computer code, or to set base-case operating conditions for computations with the computer code. Extensive sensitivity and parametric studies were done on cold-flow mixing in the second-stage combustor, reacting flow in the second-stage combustor and converging nozzle, and particle-laden flow in the deswirl zone of the first-stage combustor, the second-stage combustor, and the converging nozzle. These simulations with subsequent analysis were able to show clearly in flow patterns and various computable measures of performance a number of sensitive and problematical areas in the design of the power train. The simulations of upstream components also provided inlet parameter profiles for simulation of the MHD power generating channel. 86 figs., 18 tabs.
Labinov, Mark S
2014-01-01
Industrial and power systems rely on engineering predictions of the flow properties of working fluids. The paper proposes a way of the utilization of the vapor quality values along the new retrograde condensation curve in the generation of the void fraction design guidelines and reliable prediction of the saturated liquid specific volumes/densities. The new procedure eliminates the involvement of semi-empirical relationships like rectilinear diameter and other similar models.
Numerical Simulation of the Flow of a Power Law Fluid in an Elbow Bend
Kanakamedala, Karthik
2010-07-14
equations are given by, ????? = ????? + ?? + ??? where, ? is the Laplacian operator ? is the density of the body ? is the body force ? is the velocity vector However, the fluid being dealt within the problem is a non-Newtonian power law fluid... parameters. This problem finds applications mainly in the food and polymer industries where non-Newtonian fluids flow through different piping sections. The elbow geometry used for performing the simulations consists of a straight portion of ??? both after...
LOGIC BASED DESIGN OF OPTIMAL RECONFIGURATION STRATEGIES FOR SHIP
Kwatny, Harry G.
LOGIC BASED DESIGN OF OPTIMAL RECONFIGURATION STRATEGIES FOR SHIP POWER SYSTEMS Harry G. Kwatny that are supplied. Keywords: applications, hybrid systems, switching, optimal control, feedback design, nonlinear of power flow, loads and energy storage devices. A challenge is the design of a power management system
Comaskey, Brian J.
2004-12-07
A fluid flow concept is applied in an optical apparatus to define a high gain stand-off, fast electro-optical q-switch which is highly impervious to high average power optical loads.
On-chip interconnection architecture optimization using a multicommodity flow approach
Hu, Yuanfang
2007-01-01
Routing Architecture Optimization . . . . . . . . . . . .Timing Analysis in On-Chip Interconnection ArchitectureLarge Scale On-Chip Interconnection Architecture Opti-
Marinca, Vasile
2015-01-01
In this paper, Optimal Homotopy Perturbation Method (OHPM) is employed to determine an analytic approximate solutions for nonlinear MHD Jeffery-Hamel flow and heat transfer problem. The Navier-Stokes equations, taking into account Maxwell's electromagnetism and heat transfer lead to two nonlinear ordinary differential equations. The obtained results by means of OHPM show a very good agreement in comparison with the numerical results and with Homotopy Perturbation Method (HPM).
Julien Sylvestre
2003-08-19
Searches for gravitational wave signals which do not have a precise model describing the shape of their waveforms are often performed using power detectors based on a quadratic form of the data. A new, optimal method of generalizing these power detectors so that they operate coherently over a network of interferometers is presented. Such a mode of operation is useful in obtaining better detection efficiencies, and better estimates of the position of the source of the gravitational wave signal. Numerical simulations based on a realistic, computationally efficient hierarchical implementation of the method are used to characterize its efficiency, for detection and for position estimation. The method is shown to be more efficient at detecting signals than an incoherent approach based on coincidences between lists of events. It is also shown to be capable of locating the position of the source.
Tatematsu, Y. Yamaguchi, Y.; Kawase, T.; Ichioka, R.; Ogawa, I.; Saito, T.; Idehara, T.
2014-08-15
The oscillation characteristics of Gyrotron FU CW GIII and its wave frequency and output power dependences on the magnetic field strength, the gun coil current, and the anode voltage were investigated experimentally. The experimental results were analyzed theoretically using a self-consistent code that included the electron properties in the cavity, corresponding to the actual operating conditions in the experiments. As a result, it was found that the variation in frequency with the magnetic field strength was related to an axial profile change in the electromagnetic wave in the cavity. In addition, the optimal condition that gives the maximum output power was found to be determined by the pitch factor rather than by the electron beam radius under the given operating conditions.
Backpropagation architecture optimization and an application in nuclear power plant diagnostics
Basu, A.; Bartlett, E.B.
1993-04-01
This paper presents a Dynamic Node Architecture (DNA) scheme to optimize the architecture of backpropagation Artificial Neural Networks (ANNs). This network scheme is used to develop an ANN based diagnostic adviser capable of identifying the operating status of a nuclear power plant. Specifically, a ``root`` network is trained to diagnose if the plant is in a normal operating condition or not. In the event of an abnormal condition, and other ``classifier`` network is trained to recognize the particular transient taking place. these networks are trained using plant instrumentation data gathered during simulations of the various transients and normal operating conditions at the Iowa Electric Light and Power Company`s Duane Arnold Energy Center (DAEC) operator training simulator.
Backpropagation architecture optimization and an application in nuclear power plant diagnostics
Basu, A.; Bartlett, E.B.
1993-01-01
This paper presents a Dynamic Node Architecture (DNA) scheme to optimize the architecture of backpropagation Artificial Neural Networks (ANNs). This network scheme is used to develop an ANN based diagnostic adviser capable of identifying the operating status of a nuclear power plant. Specifically, a root'' network is trained to diagnose if the plant is in a normal operating condition or not. In the event of an abnormal condition, and other classifier'' network is trained to recognize the particular transient taking place. these networks are trained using plant instrumentation data gathered during simulations of the various transients and normal operating conditions at the Iowa Electric Light and Power Company's Duane Arnold Energy Center (DAEC) operator training simulator.
Feng, Wei
2013-01-01
energy economic optimizations. Technologies assessed include photovoltaics (PV), solar thermal,Energy Flow Battery Power Absorption Chiller Abs. Refrigeration PV Solar Thermal
Optimal control system design for IGCC power plants with CO2 capture
Jones, D.; Bhattacharyya, D.; Turton, R.; Zitney, S.
2012-01-01
Designing an optimal control system for an integrated gasification combined cycle (IGCC) power plant with CO2 capture addresses the challenge of efficiently operating and controlling a coal-fed IGCC plant with the desired extent of CO2 capture in the face of disturbances without violating operational and environmental constraints. The control system design needs to optimize a desired scalar objective function while satisfying all the operational and environmental constraints in the presence of measured and unmeasured disturbances. Various objective functions can be considered for the control system design such as maximization of profit, maximization of the power produced, or minimization of the auxiliary power. The design of such a control system makes the plant suitable to play an active role in the smart grid era as the plant will have the required agility. In addition, other penalty function(s) such as emission penalties for CO2 or other criteria pollutants can be considered in the framework as well as losses associated with any hydrogen or carbon monoxide loses. The proposed control system design is performed in two stages. In the first stage, a top-down analysis is performed to generate a list of controlled, manipulated, and disturbance variables considering a scalar operational objective and other process constraints. In the second stage, a bottom-up approach for simultaneous design of the control structure and the controllers is used. In this paper, the first stage of the two-stage approach is applied to the IGCC’s acid gas removal (AGR) process which removes both H2S and CO2 from the shifted synthesis gas. While these results are still preliminary, they demonstrate the application of the proposed approach for a commercial-scale plant and show some interesting results related to controlled variable selection. Such an approach can be followed not only to design control systems for new power plants, but also to retrofit control systems for existing plants with suitable modifications.
Peng, Huei
. This is a consequence of an increase in the relative number of light trucks and sport-utility vehicles, as well. Optimization of Power Management Strategies for a Hydraulic Hybrid Medium Truck Bin Wu, Chan-Chiao Lin, Zoran@umich.edu This paper investigates development of power management strategies tailored specifically to a medium truck
Cho, Young Hyun
1 Optimization of Vertical and Horizontal Beamforming Kernels on the PowerPC G4 Processor with Alti-time on a Sun UltraSPARC II server with 16 333-MHz processors by utilizing the Visual Instruction Set (VIS beamforming kernels to use AltiVec SIMD extension for the PowerPC. AltiVec can execute up to four 32-bit
Optimal Risk-aware Power Procurement for Data Centers in Day-Ahead and Real-Time Electricity Markets
Mohsenian-Rad, Hamed
: Data Center, Day-ahead Market, Real-time Market, Price Diversity, Power Procurement, Service: (a) The Ameren retail price trends [18]. (b) The PJM wholesale market price trends [19]. prices, [12Optimal Risk-aware Power Procurement for Data Centers in Day-Ahead and Real-Time Electricity
Study of multi-phase flow characteristics in an MHD power train
Chang, S.L.; Lottes, S.A.; Bouillard, J.X.; Petrick, M.
1993-08-01
Computer simulation was used to predict two-phase flow processes in the CDIF MHD power train system. The predictions were used to evaluate the effects of operating and design parameters on the performance of the system and a parametric evaluation provides information to enhance the performance of the system. Major components of the system under investigation are the two-stage combustor, the converging/diverging nozzle, the supersonic MHD channel, and the diffuser. Flow in each component was simulated using a computer code. Integrating the computer codes, the two-phase flow processes in the system was calculated. Recently, the computer codes were used to investigate problems of nozzle erosion and the non-uniform iron oxide coverage on the cathode wall in the channel. A limited parametric study was conducted. The results indicated that (1) among the three nozzle geometries under investigation a {number_sign}5 nozzle has the smoothest flow development in the nozzle and has the lowest droplet deposition on wall and (2) smaller particle size and lower injection velocity tend to disperse the iron oxide particles more uniformly in the nozzle.
The flow of power law fluids in elastic networks and porous media
Sochi, Taha
2015-01-01
The flow of power law fluids, which include shear thinning and shear thickening as well as Newtonian as a special case, in networks of interconnected elastic tubes is investigated using a residual based pore scale network modeling method with the employment of newly derived formulae. Two relations describing the mechanical interaction between the local pressure and local cross sectional area in distensible tubes of elastic nature are considered in the derivation of these formulae. The model can be used to describe shear dependent flows of mainly viscous nature. The behavior of the proposed model is vindicated by several tests in a number of special and limiting cases where the results can be verified quantitatively or qualitatively. The model, which is the first of its kind, incorporates more than one major non-linearity corresponding to the fluid rheology and conduit mechanical properties, that is non-Newtonian effects and tube distensibility. The formulation, implementation and performance indicate that the...
Chertkov, M; Turtisyn, K; Chernyak, V; Lebedev, V
2011-01-01
We consider a model of a distribution feeder connecting multiple loads to the sub-station. Voltage is controlled directly at the head of the line (sub-station), however, voltage anywhere further down the line is subject to fluctuations, caused by irregularities of real and reactive distributed power consumption/generation. The lack of a direct control of voltage along the line may result in the voltage instability, also called voltage collapse - phenomenon well known and documented in the power engineering literature. Motivated by emerging photo-voltaic technology, which brings a new source of renewable generation but also contributes significant increase in power flow fluctuations, we reexamine the phenomenon of voltage stability and collapse. In the limit where the number of consumers is large and spatial variations in power flows are smooth functions of position along the feeder, we derive a set of the power flow Ordinary Differential Equations (ODE), verify phenomenon of voltage collapse, and study the ef...
AVTA: Vehicle to Grid Power Flow Regulations and Building Codes Review
Broader source: Energy.gov [DOE]
The Vehicle Technologies Office's Advanced Vehicle Testing Activity carries out testing on a wide range of advanced vehicles and technologies on dynamometers, closed test tracks, and on-the-road. These results provide benchmark data that researchers can use to develop technology models and guide future research and development. The following report is a review of Vehicle-to-Grid power flow regulations and building codes, as informed by the AVTA's testing on plug-in electric vehicle charging equipment. This research was conducted by Idaho National Laboratory.
Jennings, W.; Green, J.
2001-01-01
The purpose of this research was to determine the optimal configuration of home power systems relevant to different regions in the United States. The hypothesis was that, regardless of region, the optimal system would be a hybrid incorporating wind technology, versus a photovoltaic hybrid system without the use of wind technology. The method used in this research was HOMER, the Hybrid Optimization Model for Electric Renewables. HOMER is a computer program that optimizes electrical configurations under user-defined circumstances. According to HOMER, the optimal system for the four regions studied (Kansas, Massachusetts, Oregon, and Arizona) was a hybrid incorporating wind technology. The cost differences between these regions, however, were dependent upon regional renewable resources. Future studies will be necessary, as it is difficult to estimate meteorological impacts for other regions.
A. Vaudrey; P. Baucour; F. Lanzetta; R. Glises
2010-08-30
Producing useful electrical work in consuming chemical energy, the fuel cell have to reject heat to its surrounding. However, as it occurs for any other type of engine, this thermal energy cannot be exchanged in an isothermal way in finite time through finite areas. As it was already done for various types of systems, we study the fuel cell within the finite time thermodynamics framework and define an endoreversible fuel cell. Considering different types of heat transfer laws, we obtain an optimal value of the operating temperature, corresponding to a maximum produced power. This analysis is a first step of a thermodynamical approach of design of thermal management devices, taking into account performances of the whole system.
Vaudrey, A; Lanzetta, F; Glises, R
2009-01-01
Producing useful electrical work in consuming chemical energy, the fuel cell have to reject heat to its surrounding. However, as it occurs for any other type of engine, this thermal energy cannot be exchanged in an isothermal way in finite time through finite areas. As it was already done for various types of systems, we study the fuel cell within the finite time thermodynamics framework and define an endoreversible fuel cell. Considering different types of heat transfer laws, we obtain an optimal value of the operating temperature, corresponding to a maximum produced power. This analysis is a first step of a thermodynamical approach of design of thermal management devices, taking into account performances of the whole system.
Real-Time Combined Heat and Power Operational Strategy Using a Hierarchical Optimization Algorithm
Yun, Kyung Tae; Cho, Heejin; Luck, Rogelio; Mago, Pedro J.
2011-06-01
Existing attempts to optimize the operation of Combined Heat and Power (CHP) systems for building applications have two major limitations: the electrical and thermal loads are obtained from historical weather profiles; and the CHP system models ignore transient responses by using constant equipment efficiencies. This paper considers the transient response of a building combined with a hierarchical CHP optimal control algorithm to obtain a real-time integrated system that uses the most recent weather and electric load information. This is accomplished by running concurrent simulations of two transient building models. The first transient building model uses current as well as forecast input information to obtain short term predictions of the thermal and electric building loads. The predictions are then used by an optimization algorithm, i.e., a hierarchical controller, that decides the amount of fuel and of electrical energy to be allocated at the current time step. In a simulation, the actual physical building is not available and, hence, to simulate a real-time environment, a second, building model with similar but not identical input loads are used to represent the actual building. A state-variable feedback loop is completed at the beginning of each time step by copying, i.e., measuring, the state variable from the actual building and restarting the predictive model using these ?measured? values as initial conditions. The simulation environment presented in this paper features nonlinear effects such as the dependence of the heat exchanger effectiveness on their operating conditions. The results indicate that the CHP engine operation dictated by the proposed hierarchical controller with uncertain weather conditions have the potential to yield significant savings when compared to conventional systems using current values of electricity and fuel prices.
ECE 617: Economic Control of Interconnected Power Systems Description
Haimovich, Alexander
; economic dispatch, penalty factors, optimal power flow, short-term electricity markets and locational economic dispatch problem 4. Thermal unit economic dispatch and methods of solution 5. Optimization with constraints 6. Optimization methods such as linear programming, dynamic programming, nonlinear optimization
Power Control and Optimization of Photovoltaic and Wind Energy Conversion Systems /
Ghaffari, Azad
2013-01-01
multiple photovoltaic arrays: a PSO approach,” IEEE Trans.Particle Swarm Optimization (PSO), which is an algorithmParticle Swarm Optimization (PSO), which is an algorithm
Givler, T.; Lilienthal, P.
2005-05-01
This paper discusses using HOMER Software, NREL's Micropower Optimization Model, to explore the role of gen-sets in small solar power systems in Sri Lanka.
Optimizing flow rate and bacterial removal performance of ceramic pot filters in Tamale, Ghana
Zhang, Yiyue, S.M. Massachusetts Institute of Technology
2015-01-01
Pure Home Water (PHW) is an organization that seeks to improve the drinking water quality for those who do not have access to clean water in Northern Ghana. This study focuses on the further optimization of ceramic pot ...
A thermodynamic hypothesis regarding optimality principles for flow processes in geosystems
Liu, Hui-Hai
2015-01-01
structure of river basins. Water Resour Res 28:1095–1103of drainage networks. Water Resour Res 28:2183–2191 3. Liuhydraulic conductivity for water flow, in this case, is not
Optimization of Chilled Water Flow and Its Distribution in Central Cooling System
Maheshwari, G. P.; Hajiah, A. E.; ElSherbini, A. I.
2007-01-01
This paper analyzes the impact of chilled water flow and its distribution on energy efficiency and comfort quality, using the results of a field study conducted for a central cooling production system during 2006 in Kuwait. The paper identifies...
Optimal Dispatch of Photovoltaic Inverters in Residential Distribution Systems
Giannakis, Georgios
Optimal Dispatch of Photovoltaic Inverters in Residential Distribution Systems Emiliano Dall. The increased penetration of roof-top photovoltaic (PV) systems has highlighted pressing needs to address power--Distribution networks, inverter control, optimal power flow (OPF), photovoltaic (PV) systems, sparsity, voltage
Nonlinear power flow feedback control for improved stability and performance of airfoil sections
Wilson, David G.; Robinett, III, Rush D.
2013-09-03
A computer-implemented method of determining the pitch stability of an airfoil system, comprising using a computer to numerically integrate a differential equation of motion that includes terms describing PID controller action. In one model, the differential equation characterizes the time-dependent response of the airfoil's pitch angle, .alpha.. The computer model calculates limit-cycles of the model, which represent the stability boundaries of the airfoil system. Once the stability boundary is known, feedback control can be implemented, by using, for example, a PID controller to control a feedback actuator. The method allows the PID controller gain constants, K.sub.I, K.sub.p, and K.sub.d, to be optimized. This permits operation closer to the stability boundaries, while preventing the physical apparatus from unintentionally crossing the stability boundaries. Operating closer to the stability boundaries permits greater power efficiencies to be extracted from the airfoil system.
Sapatnekar, Sachin
Placement Optimization of Power Supply Pads Based on Locality Pingqiang Zhou, Vivek Mishra, and Sachin S. Sapatnekar Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN 55455, USA. {pingqiang, vivek, sachin}@umn.edu Abstract--This paper presents an efficient
Su, Weifeng
IEEE SIGNAL PROCESSING LETTERS, VOL. 14, NO. 6, JUNE 2007 377 Outage Analysis and Optimal Power. Ray Liu, Fellow, IEEE Abstract--In this letter, a novel approach for outage probability analysis on that approximation, an outage probability bound is derived which proves to be tight at high SNR. Based on the derived
Pedram, Massoud
SLA-based Optimization of Power and Migration Cost in Cloud Computing Hadi Goudarzi, Mohammad - Systems {hgoudarz, ghasemaz and pedram}@usc.edu Abstract--Cloud computing systems (or hosting datacenters of a cloud computing system is a strong function of the consolidation and migration techniques used to assign
Stefanopoulou, Anna
Dynamics, Optimization and Control of a Fuel Cell Based Combined Heat Power (CHP) System, a natural gas fuel processor system (FPS), a proton exchange membrane fuel cell (PEM-FC) and a catalytic) systems based on fuel cells and fuel processing technologies have great potential for future shipboard
Oren, Shmuel S.
Marginal Pricing for Optimal Electric Vehicle Charging Management Ruoyang Li, Student Member, IEEE, Qiuwei Wu, Member, IEEE, and Shmuel S. Oren, Fellow, IEEE Abstract--This paper presents an integrated vehicle (EV) loads in future power systems. In the proposed approach, the distribution system op- erator
Design of a Real-Time Adaptive Power Optimal Sensor System Ari Y. Benbasat and Joseph A. Paradiso
and size of the necessary components, particularly MEMS based sensors. However, such systems are oftenDesign of a Real-Time Adaptive Power Optimal Sensor System Ari Y. Benbasat and Joseph A. Paradiso,joep}@media.mit.edu Abstract Wireless sensors systems are currently being deployed in a wide variety of lightweight mobile
Optimal selection of on-site generation with combined heat and power applications
Siddiqui, Afzal S.; Marnay, Chris; Bailey, Owen; Hamachi LaCommare, Kristina
2004-01-01
Modeling with Combined Heat and Power Applications. LBNL-Tax on Microgrid Combined Heat and Power Adoption. JournalGeneration with Combined Heat and Power Applications Afzal
Power Control and Optimization of Photovoltaic and Wind Energy Conversion Systems /
Ghaffari, Azad
2013-01-01
Power Point Tracking in Photovoltaic Systems . . . 4.1DC- DC converter photovoltaic systems: power optimizationgrid-connected photovoltaic systems,” IET Electric Power
Optimal unsteady convection over a duty cycle for arbitrary unsteady flow under dynamic thermal load
Bahrami, Majid
power electronics and electric machines (APEEM) inside hybrid electric, electric, and fuel cell vehicles for the next generation advanced power electronics and electric machines (APEEM). APEEM has applications in emerging cleantech systems such as powertrain and propulsion systems of hybrid electric, electric vehi
Ernst, Damien
Advanced optimization methods for power systems P. Panciatici, M.C. Campi, S. Garatti, S.H. Low, D from a grid operator perspective 2 Taxonomy of optimization problems 3 Recent developments in the eld of optimization 4 Possible synergies with sister elds 5 Summary 6 References 2 / 53 #12;Context: An increasing
Approximating an Optimal Production Policy in a Continuous Flow Line: Recurrence and Asymptotic
Vázquez-Abad, Felisa J.
, production planning and schedul ing, producetostock, buffer size, buffer control, JIT systemsprone tandem machines. The production is regulated by a continuous version of buffer control. Our goal that for each feasible machine state, the optimal production control policy is to move the inventory levels
Improving electricity production in tubular microbial fuel cells through optimizing the anolyte h l i g h t s " The spiral spacers improve electricity production in tubular microbial fuel cells fuel cells Spiral spacers Energy Wastewater treatment a b s t r a c t The use of spiral spacers
Qin, Wensheng
. The use of methanol as solvent at the optimal conditions proved to be potential in making the system more. Introduction The world biodiesel production has been boosted in recent years owing to an increasing demand of renewable and sustainable energy. Glycerol is produced as a byproduct in the process of biodiesel production
An Improved Lagrangian Relaxation Method for VLSI Combinational Circuit Optimization
Huang, Yi-Le
2012-02-14
Gate sizing and threshold voltage (Vt) assignment are very popular and useful techniques in current very large scale integration (VLSI) design flow for timing and power optimization. Lagrangian relaxation (LR) is a common ...
Kimura, Nobuyuki; Hayashi, Kenji; Kamide, Hideki; Itoh, Masami; Sekine, Tadashi
2005-11-15
An innovative sodium-cooled fast reactor has been investigated in a feasibility study of fast breeder reactor cycle systems in Japan. A compact reactor vessel and a column-type upper inner structure with a radial slit for an arm of a fuel-handling machine (FHM) are adopted. Dipped plates are set in the reactor vessel below the free surface to prevent gas entrainment. We performed a one-tenth-scaled model water experiment for the upper plenum of the reactor vessel. Gas entrainment was not observed in the experiment under the same velocity condition as the reactor. Three vortex cavitations were observed near the hot-leg inlet. A vertical rib on the reactor vessel wall was set to restrict the rotating flow near the hot leg. The vortex cavitation between the reactor vessel wall and the hot leg was suppressed by the rib under the same cavitation factor condition as in the reactor. The cylindrical plug was installed through the hole in the dipped plates for the FHM to reduce the flow toward the free surface. It was effective when the plug was submerged into the middle height in the upper plenum. This combination of two components had a possibility to optimize the flow in the compact reactor vessel.
Qu, Zhihua
for Power Flow Control of Photovoltaic Generators in a Distribution Network Huanhai Xin, Zhihua Qu, Fellow 310027, China. He was also with the University of Central Florida, Orlando, FL 32815 USA, when he and Computer Sci- ence, University of Central Florida, Orlando, FL 32815 USA (e-mail: qu@eecs. ucf.edu). J
Optimal Power Flow as a Tool for Fault Level Constrained Network Capacity Analysis
Vovos, Panagis; Harrison, Gareth P; Wallace, Robin; Bialek, Janusz
2005-01-01
The aim of this paper is to present a new method for the allocation of new generation capacity, which takes into account fault level constraints imposed by protection equipment such as switcvhgear. It simulates new generation ...
CHANCE CONSTRAINED OPTIMAL POWER FLOW: RISK-AWARE NETWORK CONTROL UNDER UNCERTAINTY
Bienstock, Daniel
which compromises stability. Smart grid goals include a commitment to large penetration of highly. A benefit of a cost-effective migration toward a more algorithmic-driven grid concerns the effective generation (coal, gas and hy- dro plants) over control areas of transmission networks, can result in grid
Robertson, James George
2015-06-29
Climate change has brought about legally-binding targets for Scotland, the U.K. and the E.U. to reduce greenhouse gas emissions and source a share of overall energy consumption from renewable energy resources by 2020. ...
Relaxations for multi-period optimal power flow problems with discrete decision variables
Ernst, Damien
of renewable energy sources. To benefit from the flexibility of customers, it is necessary to account with discrete variables that define mixed-integer non-convex mathematical programs. We propose two types or the rejection of bids, or the start up of some generation units. As a first example, the day-ahead energy market
Aalborg Universitet Supervisory Control for Real Time Reactive Power Flow Optimization in Islanded
Vasquez, Juan Carlos
production paradigm to local and distributed generation. However, such energy systems require complex-662 Warsaw, Poland b Aalborg University, Institute of Energy Technology, Pontoppidanstraede 101, DK-9220 Aalborg East, Denmark c Universitat Politècnica de Catalunya Department of Chemical Engineering EUETIB
Optimal Power Flow of Multiple Energy Carriers(Geidl and Andersson 2007) |
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION J APPENDIX ECoop Inc Jump to:Newberg, Oregon:OGEProjects/Definitions Jump
Chang, S.L.; Lottes, S.A.; Petrick, M.
1994-06-01
A three-dimensional, two-phase, turbulent flow computer code was used to predict flow characteristics of seed particles and coal gas in the deswirl section of the CDIF MHD power train system. Seed material which has a great effect on the overall performance of the MHD system is injected in the deswirl against the swirling coal gas flow coming from the first stage combustor. While testing the MHD system, excessive seed material (70% more than theoretical value) was required to achieve design operating conditions. Calculations show that the swirling coal gas flow turns a 90 degree angle to minimize the swirl motion before entering a second stage combustor and many seed particles are too slow to react to the flow turning and deposit on the walls of the deswirl section. Some seed material deposited on the walls is covered by slag layer and removed from the gas flow. The reduction of seed material in the gas flow decreases MHD power generation significantly. A computational experiment was conducted and its results show that seed injection on the wall can be minimized by simply changing the seed injection and an optimum location was identified. If seed is injected from the location of choice, the seed deposition is reduced by a factor of 10 compared to the original case.
Miller, John M; Rakouth, Heri; Suh, In-Soo
2012-01-01
This paper is aimed at reviewing the technology trends for wireless power transfer (WPT) for electric vehicles (EV). It also analyzes the factors affecting its efficiency and describes the techniques currently used for its optimization. The review of the technology trends encompasses both stationary and moving vehicle charging systems. The study of the stationary vehicle charging technology is based on current implementations and on-going developments at WiTricity and Oak Ridge National Lab (ORNL). The moving vehicle charging technology is primarily described through the results achieved by the Korean Advanced Institute of Technology (KAIST) along with on-going efforts at Stanford University. The factors affecting the efficiency are determined through the analysis of the equivalent circuit of magnetic resonant coupling. The air gap between both transmitting and receiving coils along with the magnetic field distribution and the relative impedance mismatch between the related circuits are the primary factors affecting the WPT efficiency. Currently the industry is looking at an air gap of 25 cm or below. To control the magnetic field distribution, Kaist has recently developed the Shaped Magnetic Field In Resonance (SMFIR) technology that uses conveniently shaped ferrite material to provide low reluctance path. The efficiency can be further increased by means of impedance matching. As a result, Delphi's implementation of the WiTricity's technology exhibits a WPT efficiency above 90% for stationary charging while KAIST has demonstrated a maximum efficiency of 83% for moving vehicle with its On Line Vehicle (OLEV) project. This study is restricted to near-field applications (short and mid-range) and does not address long-range technology such as microwave power transfer that has low efficiency as it is based on radiating electromagnetic waves. This paper exemplifies Delphi's work in powertrain electrification as part of its innovation for the real world program geared toward a safer, greener and more connected driving. Moreover, it draws from and adds to Dr. Andrew Brown Jr.'s SAE books 'Active Safety and the Mobility Industry', 'Connectivity and Mobility Industry', and 'Green Technologies and the Mobility Industry'. Magnetic resonant coupling is the foundation of modern wireless power transfer. Its efficiency can be controlled through impedance matching and magnetic field shaping. Current implementations use one or both of these control methods and enable both stationary and mobile charging with typical efficiency within the 80% and 90% range for an air gap up to 25 cm.
Aydin, Hakan
for efficient power- aware design and dynamic power monitoring techniques. Solar- and nuclear-powered systems such as the ACPI (Advanced COP figuration and Power Interface) [I11 for power manage- ment of laptop computers,his technique remains sub-optima.1, even for a system with perfect, knowledge of idle intervals. In other words
Opazo, A; Bustamante, G; Labbé, R
2015-01-01
We report experimental results for fluctuations of injected power in confined von K\\'arm\\'an swirling flows with constant external torque applied to the stirrers. Two experiments were performed at nearly equal Reynolds numbers in geometrically similar experimental setups, using air in one of them and water in the other. We found that the probability density function of power fluctuations is strongly asymmetric in air, while in water it is closer to a Gaussian, showing that the effect that a big change on the fluid density has on the flow-stirrer interaction is not reflected merely by a change in the amplitude of stirrers' response. In the case of water, with a density roughly 830 times greater than air density, the forcing exerted by the flow on the stirrers is stronger, so that they follow more closely the locally averaged rotation of the flow. When the fluid is air, the forcing is much weaker, resulting not only in a smaller stirrer response to the torque exerted by the flow, but also in power fluctuations ...
Power Control and Optimization of Photovoltaic and Wind Energy Conversion Systems /
Ghaffari, Azad
2013-01-01
2011. [2] ——, “High altitude wind power systems: A survey onidea of harnessing high altitude wind power using a tetheredComputed power densities in high altitude winds exceed a 10
Circuit and System Level Design Optimization for Power Delivery And Management
Xu, Tong
2014-12-08
that are widely utilized in modern chip designs. Various design challenges merge with these power management techniques in nanometer VLSI circuits. For example, power gating introduces unique power integrity issues and trade-offs between switching noise and rush...
emission in galaxies at z1-2: Evidence for cold flow accretion powered star formation in the
Spoon, Henrik
PDRs, extending to kpc scales. We suggest that the star formation mode in these systems follows to the observed [CII] line. Subject headings: galaxies: evolution, star formation, PDRs, PAHs, shocks #12; 3 1Strong C+ emission in galaxies at z1-2: Evidence for cold flow accretion powered star formation
Van Zee, John W.
2006-01-01
Journal of Power Sources xxx (2006) xxxxxx The impact of channel path length on PEMFC flow Distributions in reactant species concentration in a PEMFC due to local consumption of fuel and local transport in three dimensions in a PEMFC. These distributions can lead to flooding or drying of the membrane that may
Interactions between turbulent open channel flow, power and the wake of an axial-flow marine turbine
Siefert, Chris
turbine Leonardo P. Chamorro1 , Craig Hill1 , Vincent Neary2 , Budi Gunawan2 , Roger Arndt1 , Fotis-flow marine hydrokinetic turbines was lacking. Advancing this area of knowledge within the field of marine and hydrokinetic energy research, development, and deployment will lead to more efficient turbine operations
Power Control and Optimization of Photovoltaic and Wind Energy Conversion Systems /
Ghaffari, Azad
2013-01-01
77 5.2 Wind Energy Conversion System . . . . .Optimization and Control in Wind Energy Conversion SystemsAC matrix con- verter for wind energy conversion system,” in
Data-Semantics Driven Power Optimization of Wireless Medical Monitoring Devices
Goudar, Vishwatma Arun
2013-01-01
Kaiser. “MicroLEAP: Energy-aware Wireless Sensor PlatformAdaptive Strategy for Energy- Efficiency in Wireless Medicaljid Sarrafzadeh. “Energy optimization in wireless medical
High-Harmonic Fast-Wave Power Flow Along Magnetic Field Lines in the Scrape-Off Layer of NSTX
Perkins, R. J. [Princeton Plasma Physics Laboratory (PPPL); Hosea, J. [Princeton Plasma Physics Laboratory (PPPL); Kramer, G. [Princeton Plasma Physics Laboratory (PPPL); Ahn, Joonwook [ORNL; Bell, R. E. [Princeton Plasma Physics Laboratory (PPPL); Diallo, A. [Princeton Plasma Physics Laboratory (PPPL); Gerhardt, S. [Princeton Plasma Physics Laboratory (PPPL); Gray, T. K. [Oak Ridge National Laboratory (ORNL); Green, David L [ORNL; Jaeger, Erwin Frederick [ORNL; Jaworski, M. A. [Princeton Plasma Physics Laboratory (PPPL); LeBlanc, B [Princeton Plasma Physics Laboratory (PPPL); McLean, Adam G [ORNL; Maingi, Rajesh [ORNL; Phillips, C. K. [Princeton Plasma Physics Laboratory (PPPL); Roquemore, L. [Princeton Plasma Physics Laboratory (PPPL); Ryan, Philip Michael [ORNL; Sabbagh, S. A. [Columbia University; Taylor, G. [Princeton Plasma Physics Laboratory (PPPL); Wilson, J. R. [Princeton Plasma Physics Laboratory (PPPL)
2012-01-01
A significant fraction of high-harmonic fast-wave (HHFW) power applied to NSTX can be lost to the scrape-off layer (SOL) and deposited in bright and hot spirals on the divertor rather than in the core plasma. We show that the HHFW power flows to these spirals along magnetic field lines passing through the SOL in front of the antenna, implying that the HHFW power couples across the entire width of the SOL rather than mostly at the antenna face. This result will help guide future efforts to understand and minimize these edge losses in order to maximize fast-wave heating and current drive.
The optimization problem Genetic Algorithm
Giménez, Domingo
The optimization problem Genetic Algorithm Particle Swarm Optimization Experimental results for time-power optimization META, October 27-31, 2014 1 / 25 #12;The optimization problem Genetic Algorithm Particle Swarm Optimization Experimental results Conclusions Time and energy optimization Traditionally
slowly driving the generator while flying fast in a crosswind direction. To achieve a periodic power
Kolb, Gregory J. (Albuquerque, NM)
2012-02-07
A suction-recirculation device for stabilizing the flow of a curtain of blackened heat absorption particles falling inside of a solar receiver with an open aperture. The curtain of particles absorbs the concentrated heat from a solar mirror array reflected up to the receiver on a solar power tower. External winds entering the receiver at an oblique angle can destabilize the particle curtain and eject particles. A fan and ductwork is located behind the back wall of the receiver and sucks air out through an array of small holes in the back wall. Any entrained particles are separated out by a conventional cyclone device. Then, the air is recirculated back to the top of the receiver by injecting the recycled air through an array of small holes in the receiver's ceiling and upper aperture front wall. Since internal air is recirculated, heat losses are minimized and high receiver efficiency is maintained. Suction-recirculation velocities in the range of 1-5 m/s are sufficient to stabilize the particle curtain against external wind speeds in excess of 10 m/s.
Power plant degradation : a modular secondary plant and integral flow accelerated corrosion model
Van der Helm, Mark Johan, 1972-
2001-01-01
Flow Accelerated Corrosion (FAC) is the most prevalent material degradation mechanism for low carbon steel in steam-water flow systems. The band of uncertainty in predictions of wear rate due to FAC spans one to two orders ...
Optimizing the Mass Flow and Temperature Difference in a Cooling System for Energy Conservation
Hart, M. N.; Bond, S. K.
1980-01-01
for specifying the mass rate and temperature difference for given heat loads to minimize energy consumption. I INTRODUCTION Conventional wisdom has suggested to most Operational parameters of heat exchangers a~e building operators that raising the chilled...-STORY OFFICE BUILDINGS 8uildi ng A 8ui1ding 8 8ullding C Lighting 28 31 33 Chiller 29 25 29 Auxill aries {fans & pumps l 37 39 34 Hi sce 11 aneous 6 5 4 rota1 square footage 104,000 95,000 91,000 Total No. of Floors 4 4 In Figure 3 the fan power...
Membranes Optimized for High Conductivity and Low Crossover of Redox Flow
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration wouldMass map shines light on dark matter By SarahMODELINGMeetingsMembranes - Phosphazene
Combinational logic optimization for low power using implication-based transformations
Swarna, Madhukiran V.
1997-01-01
The demand for portable equipment has increased the emphasis on low-power designs. Higher power consumption results in shorter battery-lifetime of portable electronic devices. As a result larger batteries are required for ...
Computation of the maximum loadability of a power system using nonlinear optimization
Khabirov, Abdufarrukh
2001-01-01
In recent years, power systems have undergone radical changes by becoming deregulated. Many electric companies have met new requirements and found ways to keep up with the changes in power systems. Issues of transfer capability and maximum...
Power Control and Optimization of Photovoltaic and Wind Energy Conversion Systems /
Ghaffari, Azad
2013-01-01
Output power leveling of wind turbine generator for allpower map of Distributed Generators (DG), including Photo- voltaic (PV) and WindGenerator (IG) stator. Introduction A variable speed wind turbine generates power
Power Control and Optimization of Photovoltaic and Wind Energy Conversion Systems /
Ghaffari, Azad
2013-01-01
design that has good performance robustness to uncertainty, and faster transient performance, allowing for power tracking under rapidly varying wind
TCOM-06-0462 1 Full vectoring optimal power allocation in xDSL
systems, Optimization methods I. INTRODUCTION The growing demand for high speed services in access copper pairs, allowing customers to be served with higher bitrates through the usage of adequate Multiple
Optimal meter placement and transaction-based loss allocation in deregulated power system operation
Ding, Qifeng
2005-02-17
is the selection of candidate measurement sets, each of which will make the system observable under a given contingency (loss of measurements and network topology changes). A new method is then developed for optimal meter placement, which is the choice...
Zebian, Hussam
2014-01-01
Efficient and clean electricity generation is a major challenge for today's world. Multivariable optimization is shown to be essential in unveiling the true potential and the high efficiency of pressurized oxy-coal combustion ...
A Multilevel Introspective Dynamic Optimization System For Holistic Power-Aware
and longer lasting, but battery technology is not improving at the same rate that power consumption is rising://drops.dagstuhl.de/opus/volltexte/2005/309 #12;2 V. Venkatachalam, C. W. Probst, M. Franz applications application mobile code virtual with exponentially growing power densities. At the low-end, there is a demand to make mobile devices more powerful
Optimal Low Power XOR Gate Decomposition Hai Zhou 1 , D. F. Wong 2
Zhou, Hai
and integration density, power is being given compa rable weight to speed and area in IC designs. For the problemspeed computation and complex functionality with low power consump tion. Without lowpower design techniques and E i sw can be controlled in design process, usually E i sw in logic synthesis and C i L in physical
Noble, Pascal
2012-01-01
In this paper we derive consistent shallow water equations for thin films of power law fluids down an incline. These models account for the streamwise diffusion of momentum which is important to describe accurately the full dynamic of the thin film flows when instabilities like roll-waves arise. These models are validated through a comparison with Orr Sommerfeld equations for large scale perturbations. We only consider laminar flow for which the boundary layer issued from the interaction of the flow with the bottom surface has an influence all over the transverse direction to the flow. In this case the concept itself of thin film and its relation with long wave asymptotic leads naturally to flow conditions around a uniform free surface Poiseuille flow. The apparent viscosity diverges at the free surface which, in turn, introduces a singularity in the formulation of the Orr-Sommerfeld equations and in the derivation of shallow water models. We remove this singularity by introducing a weaker formulation of Cauc...
CHANNELS WITH ALIEN CROSSTALK Vincent Le Nir, Marc Moonen, Jan Verlinden Katholieke Universiteit Leuven of do- main or alien crosstalk requires a more advanced processing. In vector channels, Multiple Input. In this paper, we investigate the problem of power allocation in xDSL vector channels under in-domain and alien
Peng, Huei
strategy is as significant as component sizing in achieving optimal fuel economy of a fuel cell hybrid demonstrate that combined optimization can efficiently provide excellent fuel economy. 1. Introduction Power management strategy and component sizing affect vehicle performance and fuel economy considerably in hybrid
Ramanujam, J. "Ram"
- and a is the average number of transitions per clock phase heuristic for peak and average power cycle at the gate
A Global Optimization Approach to the Design of Solar Power Plants
2014-05-08
May 8, 2014 ... at a high temperature is then transferred to the heat transfer fluid to produce ...... A Review of Hybrid Solar-Fossil Fuel Power Generation.
Power dissipation and time-averaged pressure in oscillating flow through a sudden area change
Smith, Barton L.
that abrupt changes in geometry are ubiquitous in Stirling engines, thermoacoustics, and res- piratory flows Barton L. Smith Mechanical and Aerospace Engineering Department, Utah State University, Logan, Utah 84322-averaged pressure gradient has been used to counteract streaming flows in a thermoacoustic Stirling refrigerator1
Davis, Michael A.
2011-10-21
Single Duct Variable Air Volume (SDVAV) systems use series and parallel Fan Powered Terminal Units to control the air flow in conditioned spaces. This research developed a laboratory verified model of SDVAV systems that ...
Paper Number Sizing and Optimal Operation of a Power Split Hydraulic
Li, Perry Y.
sector. In hybrid vehicles energy is saved by regenerating kinetic energy while braking, by operating power sources that can directly or indirectly propel the vehicle. A hybrid vehicle saves energy in three as alternative energy storage and electric motors and generators are used to assist the engine in power, is often
Highly optimized tolerance and power laws in dense and sparse resource regimes M. Manning,1
Carlson, Jean
with data for wildfires, web file sizes, and electric power outages. However, another HOT model, based of the power laws, with detailed, high-resolution simulation models, aimed at pinpointing specific system, USA 2 Department of Control and Dynamical Systems and Electrical Engineering, California Institute
S-MAPEL: Monotonic Optimization for Non-convex Joint Power Control and Scheduling Problems
Huang, Jianwei
generation wireless networks. Transmission power control in wireless networks has been extensively studied-limited wireless networks where si- multaneous transmissions on nearby links heavily interfere with each other of concurrently active links as well as the flexibility to vary power allocation over time gives rise to a series
Optimal Power Scheduling for Correlated Data Fusion in Wireless Sensor Networks Via
Jayaweera, Sudharman K.
in many WSN applications over the centralized approach since it drastically reduces communication resource power WSN is limited by resource constraints, namely power and bandwidth. In a typical WSN is considered to be a core issue in designing a WSN. A. Related work The problem of distributed detection
Rogelio, Garcia Retegui; Gustavo, Uicich; Mario, Benedetti; Gilles, Le Godec; Konstantinos, Papastergiou
2015-01-01
In the framework of a Transfer line (TT2) Consolidation Programme, a number of studies on Energy cycling have been commissioned. Part of this work involves the study of dierent power electronic system topologies for magnet energy recovery. In this report, the use of a boost front-end converter supplying DC link of a 4-quadrant magnet supply is analysed. The key objective of the study is to find control strategies that result in the control of the peak power required from the power network as well as to recover the magnet energy into capacitor banks with controlled voltage fluctuation. The study comprises the modelling of the system by means of the method of state averaging and the development of regulation strategies to energy management. The proposed control strategies can be divided in two groups: in the first group, the magnet current is used to define the reference for the control system, while in the second group this current is unknown and some strategies are devised to limit the power drawn from the el...
He, Zhihai "Henry"
-Rate-Distortion Optimization Zhihai He, Wenye Cheng, and Xi Chen £ Department of Electrical and Computer Engineering University framework to save the data processing energy and extend the operational lifetime of portable video communication devices. Video compression is computationally intensive and energy-consuming. However, portable
Optimal Design of a Stand-Alone Hybrid PV/Fuel Cell Power System for the City of Brest in France
Paris-Sud XI, Université de
cell power system without battery storage to supply the electric load demand of the city of Brest energy consumption depends on the "regional sidelines" by high-voltage transmission lines through highOptimal Design of a Stand-Alone Hybrid PV/Fuel Cell Power System for the City of Brest in France
Optimal Inverter VAR Control in Distribution Systems with High PV Penetration
Low, Steven H.
and the net benefits, taking into account the additional cost of inverter losses when operating at non the substation. Index Terms--Distribution systems, volt/var control, DC/AC inverter, optimal power flow
Wang, Chunyun, 1968-
2003-01-01
The Modular Pebble Bed Reactor system (MPBR) requires a gas turbine cycle (Brayton cycle) as the power conversion system for it to achieve economic competitiveness as a GenIV nuclear system. The availability of controllable ...
Naval ship propulsion and electric power systems selection for optimal fuel consumption
Sarris, Emmanouil
2011-01-01
Although propulsion and electric power systems selection is an important part of naval ship design, respective decisions often have to be made without detailed ship knowledge (resistance, propulsors, etc.). Propulsion and ...
Utility-based Time and Power Allocation on an Energy Harvesting Downlink: The Optimal
Uysal-Biyikoglu, Elif
advances in the areas of solar, piezoelectric and thermal energy har- vesting, enable systems harvest energy through solar cells, vibration absorption devices, thermoelectric generators, wind power of wireless communication networks. However, this renewable energy supply feature also calls for specific
Bertsimas, Dimitris J.
In this paper, we show a significant role that geometric properties of uncertainty sets, such as symmetry, play in determining the power of robust and finitely adaptable solutions in multistage stochastic and adaptive ...
Development of optimized core design and analysis methods for high power density BWRs
Shirvan, Koroush
2013-01-01
Increasing the economic competitiveness of nuclear energy is vital to its future. Improving the economics of BWRs is the main goal of this work, focusing on designing cores with higher power density, to reduce the BWR ...
Cleaning process development and optimization in the surface mount assembly line of power modules
Mukherjee, Ishan
2011-01-01
The cleaning process in the surface mount assembly line of power modules had been found to insufficiently remove solder flux residue from printed circuit board (PCB) assemblies after the process of reflow soldering. This ...
Gallant, Betar M. (Betar Maurkah)
2008-01-01
Compressive stress applied to the electrode area of a Proton Exchange Membrane (PEM) fuel cell is known to significantly affect power output. In practice, electrode stress arises during operation due to the clamping force ...
A method to determine the optimal features for control of a powered lower-limb prostheses
Farrell, Matthew T.
Lower-limb prostheses are rapidly advancing with greater computing power and sensing modalities. This paper is an attempt to begin exploring the trade-off between extrinsic and intrinsic control modalities. In this case, ...
Power Control and Optimization of Photovoltaic and Wind Energy Conversion Systems /
Ghaffari, Azad
2013-01-01
power at the wind turbine shaft as the cost func- tion asstructure, cost, and land occupation. In wind turbines, thecost. Since the P&O method adds delay, it is not practical for medium- and large-inertia wind turbine
Thermal desalination : structural optimization and integration in clean power and water
Zak, Gina Marie
2012-01-01
A large number of resources are dedicated to seawater desalination and will only grow as world-wide water scarcity increases. In arid areas with high temperature and salinity seawater, thermal desalination and power plants ...
Feasibility Study of a Multi-Purpose Computer Program for Optimizing Heat Rates in Power Cycles
Menuchin, Y.; Singh, K. P.; Hirota, N.
1981-01-01
A study of currently available commercial codes which evaluate the thermal performance of turbine cycles in power plants is presented. The analytical basis, capabilities, and possible applications of these codes are described. A survey of some user...
Design, Packaging, and Architectural Policy Co-optimization for DC Power Integrity in 3D DRAM
Lim, Sung Kyu
-domain CAD/architectural platform that addresses DC power noise issues in 3D DRAM targeting stacked DDR3) Interposer Figure 1: Default configurations of four 3D DRAM designs. (a) on-chip stacked DDR3, (b) off-chip stacked DDR3, (c) Wide I/O, and (d) HMC. are used in a stacked DDR3 design [2] to reduce power noise. Sub
Optimization and operation of a cementation plant in the Atucha I Nuclear Power Plant
Schifferdecker, H. [Kraftanlagen Energie- und Industrieanlagen Heidelberg (Germany)
1995-12-31
The quality of conditioned radioactive waste must constantly be improved to keep pace with technical progress. To meet these ever-increasing demands it is necessary to modernize existing plants for the treatment of radioactive waste. The Atucha I NPP has been in operation since 1974 and the cementation plant no longer conformed with today`s requirements regarding safe operation and product quality. The optimization of the plant mainly involved the execution of the following points: Dismantling of existing plant sections to enable the installation of new and supplementary components; Installation of new and supplementary plant sections (components); Integration of the new system into the existing plant; and Commissioning of the new plant and operation of the plant using the optimized process for the duration of 60 calendar days. 200 barrels were to be cemented during this period.
Energy Savings Opportunities through Combined Heat and Power Systems Optimization Model Case Studies
Owaidh, M.
2015-01-01
Use Energy Savings Opportunities Through CHP Optimization Models IETC, Jun 2-4 2015 © Copyright 2015, Saudi Aramco. All rights reserved. ESL-IE-15-06-07 Proceedings of the Thrity-Seventh Industrial Energy Technology Conference New Orleans, LA. June 2...-4, 2015 Saudi Aramco: Company General Use Outline: • Introduction – Overview of CHP models – Current Reality • Case Study – Correlations development – Analysis • Conclusion ESL-IE-15-06-07 Proceedings of the Thrity-Seventh Industrial Energy Technology...
Optimal Power System and Grid Interface Design Considerations for the CLICs Klystron Modulators
Marija, Jankovic; Jon, Clare; Pat, Wheeler; Davide, Aguglia
2015-01-01
The Compact Linear Collider (CLIC) is an electron-positron collider under study at CERN with the aim to explore the next generation of high precision/high energy particles physics. The CLIC’s drive beams will be accelerated by approximately 1300 klystrons, requiring highly efficient and controllable solid state capacitor discharge modulators. Capacitor charger specifications include the requirement to mask the pulsed effect of the load from the utility grid, ensure maximum power quality, control the derived DC voltage precisely (to maximize accuracy for the modulators being implemented), and achieve high efficiency and operability of the overall power system. This paper presents the work carried out on the power system interface for the CLIC facility. In particular it discusses the challenges on the utility interface and analysis of the grid interface converters with regards to required functionality, efficiency, and control methodologies.
Optimal site selection and sizing of distributed utility-scale wind power plants
Milligan, M.R. [National Renewable Energy Lab., Golden, CO (United States); Artig, R. [Minnesota Dept. of Public Service, St. Paul, MN (United States)
1998-04-01
As electric market product unbundling occurs, sellers in the wholesale market for electricity will find it to their advantage to be able to specify the quantity of electricity available and the time of availability. Since wind power plants are driven by the stochastic nature of the wind itself, this can present difficulties. To the extent that an accurate wind forecast is available, contract deviations, and therefore penalties, can be significantly reduced. Even though one might have the ability to accurately forecast the availability of wind power, it might not be available during enough of the peak period to provide sufficient value. However, if the wind power plant is developed over geographically disperse locations, the timing and availability of wind power from these multiple sources could provide a better match with the utility`s peak load than a single site. There are several wind plants in various stages of planning or development in the US. Although some of these are small-scale demonstration projects, significant wind capacity has been developed in Minnesota, with additional developments planned in Wyoming and Iowa. As these and other projects are planned and developed, there is a need to perform analysis of the value of geographically diverse sites on the efficiency of the overall wind plant. In this paper, the authors use hourly wind-speed data from six geographically diverse sites to provide some insight into the potential benefits of disperse wind plant development. They provide hourly wind power from each of these sites to an electric reliability simulation model. This model uses generating plant characteristics of the generators within the state of Minnesota to calculate various reliability indices. Since they lack data on wholesale power transactions, they do not include them in the analysis, and they reduce the hourly load data accordingly. The authors present and compare results of their methods and suggest some areas of future research.
Constantinescu, E. M; Zavala, V. M.; Rocklin, M.; Lee, S.; Anitescu, M.
2011-02-01
We present a computational framework for integrating a state-of-the-art numerical weather prediction (NWP) model in stochastic unit commitment/economic dispatch formulations that account for wind power uncertainty. We first enhance the NWP model with an ensemble-based uncertainty quantification strategy implemented in a distributed-memory parallel computing architecture. We discuss computational issues arising in the implementation of the framework and validate the model using real wind-speed data obtained from a set of meteorological stations. We build a simulated power system to demonstrate the developments.
Power Supply and Consumption Co-Optimization of Portable Embedded Systems with
Pedram, Massoud
consumption. These techniques focus on reducing the energy consumption of the processing units while meeting capacitors) are widely exploited for electrical energy storage and power supply. Compared with batteries disadvantages such as low energy density and high self- discharge rate. Therefore, as electrical energy storage
Power Optimization of Wireless Media Systems with Space-Time Block Codes
Yousefi'zadeh, Homayoun
power consumption of mobile devices. Added to this the fact that the battery life is growing far more is, therefore, very impor- tant because it extends the lifetime of batteries. Multiple antenna at the University of California, Irvine; E-mail: [hy- ousefi,hamidj,mmoshfeg]@uci.edu . images across the wireless
Simulating calculations and optimization design of a new HVDC supply power for light rail system
Boyer, Edmond
investments and operation costs [1]. A light rail system is a complex system including a moving electrical with megawatt bulk substations, which includes a power transformer, a rectifier with diodes and protections [2]. This kind of substation is uncontrollable and irreversible, which limits the possible improvement
Method of optimizing performance of Rankine cycle power plants. [US DOE Patent
Pope, W.L.; Pines, H.S.; Doyle, P.A.; Silvester, L.F.
1980-06-23
A method is described for efficiently operating a Rankine cycle power plant to maximize fuel utilization efficiency or energy conversion efficiency or minimize costs by selecting a turbine fluid inlet state which is substantially on the area adjacent and including the transposed critical temperature line.
Prediction Models for Multi-dimensional Power-Performance Optimization on Many Cores
Nikolopoulos, Dimitris
a primary concern for HPC systems. Dynamic voltage and frequency scaling (DVFS) and dynamic concurrency significant reductions in energy (19% mean) and ED2 (40% mean), through simultaneous power savings (6% mean by reducing contention between threads for shared resources such as memory bandwidth. Conserving cores
Optimal Two-Tier Forecasting Power Generation Model in Smart Grids
Iyengar, S. S.
resources mostly use fos- sil fuel as their energy source which is a ma- jor environmental concern. Additionally, DRR utilization helps power system to become dis- persed. Therefore, not only SG is more dis Processing, 8(4), 79-88, 2014 ISSN : 0973-8215 IK International Publishing House Pvt. Ltd., New Delhi, India
Multi-hop wireless charging optimization in Low-Power Networks
Boyer, Edmond
to address the challenging problem of energy consumption in low-power networks. Based on these breakthroughs, none of these works have considered the multihop energy transmission, whose feasibility have been demonstrated recently. In such a system, a node can transmit energy wirelessly to its neighbors. In this paper
Edwin A. Harvego; Michael G. McKellar
2011-11-01
There have been a number of studies involving the use of gases operating in the supercritical mode for power production and process heat applications. Supercritical carbon dioxide (CO2) is particularly attractive because it is capable of achieving relatively high power conversion cycle efficiencies in the temperature range between 550 C and 750 C. Therefore, it has the potential for use with any type of high-temperature nuclear reactor concept, assuming reactor core outlet temperatures of at least 550 C. The particular power cycle investigated in this paper is a supercritical CO2 Recompression Brayton Cycle. The CO2 Recompression Brayton Cycle can be used as either a direct or indirect power conversion cycle, depending on the reactor type and reactor outlet temperature. The advantage of this cycle when compared to the helium Brayton cycle is the lower required operating temperature; 550 C versus 850 C. However, the supercritical CO2 Recompression Brayton Cycle requires an operating pressure in the range of 20 MPa, which is considerably higher than the required helium Brayton cycle operating pressure of 8 MPa. This paper presents results of analyses performed using the UniSim process analyses software to evaluate the performance of both a direct and indirect supercritical CO2 Brayton Recompression cycle for different reactor outlet temperatures. The direct supercritical CO2 cycle transferred heat directly from a 600 MWt reactor to the supercritical CO2 working fluid supplied to the turbine generator at approximately 20 MPa. The indirect supercritical CO2 cycle assumed a helium-cooled Very High Temperature Reactor (VHTR), operating at a primary system pressure of approximately 7.0 MPa, delivered heat through an intermediate heat exchanger to the secondary indirect supercritical CO2 Brayton Recompression cycle, again operating at a pressure of about 20 MPa. For both the direct and indirect cycles, sensitivity calculations were performed for reactor outlet temperature between 550 C and 850 C. The UniSim models used realistic component parameters and operating conditions to model the complete reactor and power conversion systems. CO2 properties were evaluated, and the operating ranges of the cycles were adjusted to take advantage of the rapidly changing properties of CO2 near the critical point. The results of the analyses showed that, for the direct supercritical CO2 power cycle, thermal efficiencies in the range of 40 to 50% can be achieved. For the indirect supercritical CO2 power cycle, thermal efficiencies were approximately 10% lower than those obtained for the direct cycle over the same reactor outlet temperature range.
Optimal sizing study of hybrid wind/PV/diesel power generation unit
Belfkira, Rachid; Zhang, Lu; Barakat, Georges [Groupe de Recherche en Electrotechnique et Automatique du Havre, University of Le Havre, 25 rue Philippe Lebon, BP 1123, 76063 Le Havre (France)
2011-01-15
In this paper, a methodology of sizing optimization of a stand-alone hybrid wind/PV/diesel energy system is presented. This approach makes use of a deterministic algorithm to suggest, among a list of commercially available system devices, the optimal number and type of units ensuring that the total cost of the system is minimized while guaranteeing the availability of the energy. The collection of 6 months of data of wind speed, solar radiation and ambient temperature recorded for every hour of the day were used. The mathematical modeling of the main elements of the hybrid wind/PV/diesel system is exposed showing the more relevant sizing variables. A deterministic algorithm is used to minimize the total cost of the system while guaranteeing the satisfaction of the load demand. A comparison between the total cost of the hybrid wind/PV/diesel energy system with batteries and the hybrid wind/PV/diesel energy system without batteries is presented. The reached results demonstrate the practical utility of the used sizing methodology and show the influence of the battery storage on the total cost of the hybrid system. (author)
Suction recirculation and its effects upon axial-flow pump power consumption
Prince, Tony M.
1983-01-01
1 Test Procedure Outline 2 Section and Pump Critical Flowrates and Speeds. 63 91 3 Power Coefficient and Reynolds Number Based on Cone Radius. 100 4 Power Coefficient and Reynolds Number Based on Surface Area. 101 5 Power Coefficient... Variation with NPSH with Q rl 54 Head Variation with NPSH with Q 2 . r2 55 Head Variation with NPSH with Q 3. r3' 120 128 129 130 131 134 135 136 CHAPTER I INTRODUCTION Pumps of different types are used to displace liquids from one location...
Perkins, Roy
2013-06-21
Fast-wave heating and current drive efficiencies can be reduced by a number of processes in the vicinity of the antenna and in the scrape off layer (SOL). On NSTX from around 25% to more than 60% of the high-harmonic fast-wave power can be lost to the SOL regions, and a large part of this lost power flows along SOL magnetic field lines and is deposited in bright spirals on the divertor floor and ceiling. We show that field-line mapping matches the location of heat deposition on the lower divertor, albeit with a portion of the heat outside of the predictions. The field-line mapping can then be used to partially reconstruct the profile of lost fast-wave power at the midplane in front of the antenna, and the losses peak close to the last closed flux surface (LCFS) as well as the antenna. This profile suggests a radial standing-wave pattern formed by fast-wave propagation in the SOL, and this hypothesis will be tested on NSTX-U. Advanced RF codes must reproduce these results so that such codes can be used to understand this edge loss and to minimize RF heat deposition and erosion in the divertor region on ITER.
Control strategies for 2-quadrant converter used in grid power flow control
Maestri, Sebastian; Uicich, Gustavo; Benedetti, Mario; Papastergiou, Konstantinos; Le Godec, Gilles
2015-01-01
This work presents the analysis of a two-quadrant regulator connected to the DC-link of a 4-quadrant magnet supply. The key objective is to present some regulation strategies for controlling the peak power required from the power network as well as to recover the magnet energy into capacitor banks. A comparative study that highlights the trade off between the size of reactive elements, and the peak current drawn from the electrical network is presented.
Concentration solar power optimization system and method of using the same
Andraka, Charles E
2014-03-18
A system and method for optimizing at least one mirror of at least one CSP system is provided. The system has a screen for displaying light patterns for reflection by the mirror, a camera for receiving a reflection of the light patterns from the mirror, and a solar characterization tool. The solar characterization tool has a characterizing unit for determining at least one mirror parameter of the mirror based on an initial position of the camera and the screen, and a refinement unit for refining the determined parameter(s) based on an adjusted position of the camera and screen whereby the mirror is characterized. The system may also be provided with a solar alignment tool for comparing at least one mirror parameter of the mirror to a design geometry whereby an alignment error is defined, and at least one alignment unit for adjusting the mirror to reduce the alignment error.
On Exploiting Flow Allocation with Rate Adaptation for Green Networking
Tang, Jian "Neil"
proposed for the MF-RAP provide close-to-optimal solutions. Index Terms--Green networking, power efficiency is known to have a negative impact on global climate. Therefore, green (power efficient) networking hasOn Exploiting Flow Allocation with Rate Adaptation for Green Networking Jian Tang, Brendan Mumey
Subtask 1.24 - Optimization of Cooling Water Resources for Power Generation
Daniel Stepan; Richard Shockey; Bethany Kurz; Wesley Peck
2009-03-31
The Energy & Environmental Research Center (EERC) has developed an interactive, Web-based decision support system (DSS{copyright} 2007 EERC Foundation) to provide power generation utilities with an assessment tool to address water supply issues when planning new or modifying existing generation facilities. The Web-based DSS integrates water and wastewater treatment technology and water law information with a geographic information system-based interactive map that links to state and federal water quality and quantity databases for North Dakota, South Dakota, Minnesota, Wyoming, Montana, Nebraska, Wisconsin, and Iowa.
Large amplitude oscillatory shear flow of gluten dough: A model power-law gel
Ng, Trevor S. K.
In a previous paper [T. S. K. Ng and G. H. McKinley, J. Rheol.52(2), 417–449 (2008)], we demonstrated that gluten gels can best be understood as a polymericnetwork with a power-law frequency response that reflects the ...
Liu, J.; Mai, Y.; Liu, X.
2006-01-01
At present, regulation of water flow by means of pump frequency conversion is one of the major methods for power-saving in central air conditioning systems. In this article, optimization regulation for central air conditioning system on the basis...
Yener, Aylin
Policies for Energy Harvesting Transmitters in an Interference Channel Kaya Tutuncuoglu and Aylin Yener by harvesting from ambient sources. Optimal power policies for energy harvesting nodes have attracted recent (Invited Paper) Abstract: This paper considers a two-user Gaussian interference channel with energy
Email: {zzeng2,yangao3, prkumar}@illinois.edu Abstract--Mobile devices adopt the IEEE 802.11 PSM (Power- ever, the capability of PSM to save energy is limited when the WLANs are highly congested by other Wi first-come-first-serve policy is not sleep optimal since it keeps the PSM clients awake unnecessarily
Magnetic nanoparticles for power absorption: Optimizing size, shape and magnetic properties
Gonzalez-Fernandez, M.A.; Torres, T.E.; Andres-Verges, M.; Costo, R.; Presa, P. de la; Serna, C.J.; Morales, M.P.; Marquina, C.; Ibarra, M.R.; Goya, G.F.
2009-10-15
We present a study on the magnetic properties of naked and silica-coated Fe{sub 3}O{sub 4} nanoparticles with sizes between 5 and 110 nm. Their efficiency as heating agents was assessed through specific power absorption (SPA) measurements as a function of particle size and shape. The results show a strong dependence of the SPA with the particle size, with a maximum around 30 nm, as expected for a Neel relaxation mechanism in single-domain particles. The SiO{sub 2} shell thickness was found to play an important role in the SPA mechanism by hindering the heat outflow, thus decreasing the heating efficiency. It is concluded that a compromise between good heating efficiency and surface functionality for biomedical purposes can be attained by making the SiO{sub 2} functional coating as thin as possible. - Graphical Abstract: The magnetic properties of Fe{sub 3}O{sub 4} nanoparticles from 5 to 110 nm are presented, and their efficiency as heating agents discussed as a function of particle size, shape and surface functionalization.
Miller, Travis Reed
2010-01-01
This work aimed to inform the design of ceramic pot filters to be manufactured by the organization Pure Home Water (PHW) in Northern Ghana, and to model the flow through an innovative paraboloid-shaped ceramic pot filter. ...
Graves, Steven W; Habbersett, Robert C
2013-10-22
A system and method for analyzing a particle in a sample stream of a flow cytometer or the like. The system has a light source, such as a laser pointer module, for generating a low powered light beam and a fluidics apparatus which is configured to transport particles in the sample stream at substantially low velocity through the light beam for interrogation. Detectors, such as photomultiplier tubes, are configured to detect optical signals generated in response to the light beam impinging the particles. Signal conditioning circuitry is connected to each of the detectors to condition each detector output into electronic signals for processing and is designed to have a limited frequency response to filter high frequency noise from the detector output signals.
Graves, Steven W.; Habbersett, Robert C.
2014-07-01
A system and method for analyzing a particle in a sample stream of a flow cytometer or the like. The system has a light source, such as a laser pointer module, for generating a low powered light beam and a fluidics apparatus which is configured to transport particles in the sample stream at substantially low velocity through the light beam for interrogation. Detectors, such as photomultiplier tubes, are configured to detect optical signals generated in response to the light beam impinging the particles. Signal conditioning circuitry is connected to each of the detectors to condition each detector output into electronic signals for processing and is designed to have a limited frequency response to filter high frequency noise from the detector output signals.
LaRocca, Sarah; Hassel, Henrik; Guikema, Seth
2013-01-01
Critical infrastructure systems must be both robust and resilient in order to ensure the functioning of society. To improve the performance of such systems, we often use risk and vulnerability analysis to find and address system weaknesses. A critical component of such analyses is the ability to accurately determine the negative consequences of various types of failures in the system. Numerous mathematical and simulation models exist which can be used to this end. However, there are relatively few studies comparing the implications of using different modeling approaches in the context of comprehensive risk analysis of critical infrastructures. Thus in this paper, we suggest a classification of these models, which span from simple topologically-oriented models to advanced physical flow-based models. Here, we focus on electric power systems and present a study aimed at understanding the tradeoffs between simplicity and fidelity in models used in the context of risk analysis. Specifically, the purpose of this pa...
Parallel computation of Gauss-Seidel type algorithms for power flow analysis
Ongsakul, Weerakorn
1991-01-01
of Iteration Numbers and CPU Time 25 ; III Comparison of CPU Time per Iteration and per Bus Iteration IV Number of Operations per Iteration per Bus 26 32. V Summary of Connections and Connectivity Degree in IEEE 14 Bus System VI Number of Colored Buses... in Standard IEEE System 61, VII Summary of Colored Bus Numbers 62 ' VIII CPU Times to Color Power System in 3 Colors 63 ' IX CPU Times Data to Color Texas 2429 Bus System as the Available Color Numbers Vary . X Color-by-Color Synchronized Implementation...
Microsoft PowerPoint - Proposal-Review-Flow-Chart_2013.pptx
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration wouldMass map shines light on darkMicroorganismsnow widelySmallBPA Prepayment Program 202 Jon
Robin, A.M.; Kassman, J.S.; Leininger, T.F.; Wolfenbarger, J.K.; Wu, C.M.; Yang, P.P.
1991-09-01
This second Topical Report describes the work that was completed between January 1, 1989 and December 31, 1990 in a Cooperative Agreement between Texaco and the US Department of Energy that began on September 30, 1987. During the period that is covered in this report, the development and optimization of in-situ and external desulfurization processes were pursued. The research effort included bench scale testing, PDU scoping tests, process economic studies and advanced instrument testing. Two bench scale studies were performed at the Research Triangle Institute with zinc titanate sorbent to obtain data on its cycle life, sulfur capacity, durability and the effect of chlorides. These studies quantify sulfur capture during simulated air and oxygen-blown gasification for two zinc titanate formulations. Eight PDU runs for a total of 20 days of operation were conducted to evaluate the performance of candidate sorbents for both in-situ and external desulfurization. A total of 47 tests were completed with oxygen and air-blown gasification. Candidate sorbents included iron oxide for in-situ desulfurization and calcium based and mixed metal oxides for external desulfurization. Gasifier performance and sorbent sulfur capture are compared for both air-blown and oxygen-blown operation.
Oren, Shmuel S.
Unit Commitment and Transmission Switching With N-1 Reliability Kory W. Hedman, Student Member, IEEE present a co-optimization formulation of the generation unit commitment and transmission switching problem to hour. We also show that optimizing the topology can change the optimal unit commitment schedule
Christian Kreuzer; Endre Süli
2015-03-18
We develop the a posteriori error analysis of finite element approximations of implicit power-law-like models for viscous incompressible fluids. The Cauchy stress and the symmetric part of the velocity gradient in the class of models under consideration are related by a, possibly multi--valued, maximal monotone $r$-graph, with $\\frac{2d}{d+1}finite element residual, as well as the local stability of the error bound. We then consider an adaptive finite element approximation of the problem, and, under suitable assumptions, we show the weak convergence of the adaptive algorithm to a weak solution of the boundary-value problem. The argument is based on a variety of weak compactness techniques, including Chacon's biting lemma and a finite element counterpart of the Acerbi--Fusco Lipschitz truncation of Sobolev functions, introduced by L. Diening, C. Kreuzer and E. S\\"uli [Finite element approximation of steady flows of incompressible fluids with implicit power-law-like rheology. SIAM J. Numer. Anal., 51(2), 984--1015].
Characterization of Limiting Factors in Laminar Flow-Based Membraneless Microfuel Cells
Kenis, Paul J. A.
are underway to develop and optimize microscale fuel cells as high-energy-density power source alternatives, where fuel and oxidant are oxidized and re- duced, respectively, is essential for fuel cell optimization reports the analysis of a microflu- idic fuel cell based on laminar flow using an external reference
Pankonien, Alexander Morgan
2011-10-21
to verify and extend the analytic solutions to large deflections. An energy harvester was built using off-the-shelf piezoelectric elements and tested in a wave tank facility to validate experimentally the voltage and average power predicted...
Optimization of Direct Ionization of CO2 by Controlling the Gas Flow Inside of a Beam-Target
Salazar Quintero, G A; Ognibene, T
2011-03-07
We designed and optimized a target that directs a CO{sub 2} pulse onto a Ti surface where a Cs{sup +} sputtering beam ionizes the CO{sub 2} to generate C{sup -}. These targets will be used for the direct ionization of CO{sub 2} pulses to enable the measurement of carbon isotope ratios in real time. The design was based on the results of Comsol{trademark} simulations of the target configurations.
Mailhes, Corinne
dispatching of power flows in a microgrid with storage. The investigated approach is based on the use Scheduling and Sensitivity Analysis for Sizing a Microgrid with Storage. (2014) In: 11th International FOR SIZING A MICROGRID WITH STORAGE R. Rigo-Mariani1 , B. Sareni1 , X. Roboam1 1. Université de Toulouse
Johnson, Peter D.
may also explain the larger extent of quiet Sun spicules1,2 where p- mode power and granular flows 2004; doi:10.1038/nature02749. 1. Beckers, J. M. Solar spicules. Sol. Phys. 3, 367433 (1968). 2. Beckers, J. M. Solar spicules. Annu. Rev. Astron. Astrophys. 10, 73100 (1972). 3. Sterling, A. C. Solar
The Economic Implications of Adding Wind Capacity to a Bulk Power Transmission Network
The Economic Implications of Adding Wind Capacity to a Bulk Power Transmission Network by Tim Mount. * Corresponding author, tdm2@cornell.edu. #12;2 The Economic Implications of Adding Wind Capacity to a Bulk Power limitations of solving large AC Optimal Power Flows (OPF) for real networks, system operators typically use
ELEN9501: Electrical Power Networks Name: Xiangying Qian UNI: xq2120 Final Report
Lavaei, Javad
prices resulting from an optimal power flow performed by a centralized dispatcher, e.g. Independent is the produced power and a, b and c are constants. The quadratic cost functions enable the OPF problemELEN9501: Electrical Power Networks Name: Xiangying Qian UNI: xq2120 1 Final Report 1. Literature
Giannakis, Georgios
estimation is at the core of grid monitoring, PMU deployment is optimized here based on estimation-theoretic criteria. Considering both voltage and incident current readings per PMU-instrumented bus and incorporating conventionally derived state estimates under the Bayesian framework, PMU placement is formulated as an optimal
Williams, Rube Ben
1993-01-01
flow and the required condensation rate. Large film thicknesses (small void fractions) are limited by the requirement that the condensing channels must discharge two-phase annular flow (discussed in this chapter, see FLOW REGIME RESTRICTION... Channel for Four Cases of the Ambient Radiation Load. The Void Fraction for Two-Phase Annular Flow was Predicted by the Wheeler Void Fraction Correlation . Figure 35. Comparison of the Void Fraction in a SLIC Condensing Channel for Four Cases...
Clement, Prabhakar
Pipe Flow System Design Holly Guest #12;Problem · An engineer is asked to compute the flow rate · Flow type: Turbulent or Laminar flow · Flow rate · Frictional head loss · Optimal diameters if a pump · = - ( . + . ) · f = friction factor · = relative roughness = · = Reynolds Number = · Laminar flow: 2000
Simplified VO M&V Protocol Simplified Voltage Optimization (VO)
modeling is mentioned, it refers to using industry accepted distribution system power flow simulation tools the verification process. · Calculations of all system improvements (reduction of line losses and no-load lossesSimplified VO M&V Protocol 1 Simplified Voltage Optimization (VO) Measurement and Verification
Zhang, Fan
2012-02-14
, control and communication, the concept of Virtual Power Plant (VPP) is proposed as one possible solution which aggregates and firms up spatially distributed resources? net power injection to the system. This thesis proposes a coordinated control...
Rao, D.V.; Darby, J.L.; Ross, S.B.; Clark, R.A. [Science and Engineering Associates, Inc., Albuquerque, NM (United States)
1990-04-19
The High Flux Beam Reactor (HFBR) operated by Brookhaven National Laboratory (BNL) employs forced downflow for heat removal during normal operation. In the event of total loss of forced flow, the reactor will shutdown and the flow reversal valves open. When the downward core flow becomes sufficiently small then the opposing thermal buoyancy induces flow reversal leading to decay heat removal by natural convection. There is some uncertainty as to whether the natural circulation is adequate for decay heat removal after 60 MW operation. BNL- staff carried out a series of calculations to establish the adequacy of flow reversal to remove decay heat. Their calculations are based on a natural convective CHF model. The primary purpose of the present calculations is to review the accuracy and applicability of Fauske`s CHF model for the HFBR, and the assumptions and methodology employed by BNL-staff to determine the heat removal limit in the HFBR during a flow reversal and natural convection situation.