skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Controller Design of Power Quality-Improving Appliances


This paper presents an innovative solution to power quality problems -- using power quality improving (PQI) appliances to reduce harmonic currents and improve the power factor in buildings.

; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: IEEE 38th Annual Power Electronics Specialists Conference (PESC 2007), June 17-21, 2007, Orlando, Florida, 1164-1169
Country of Publication:
United States

Citation Formats

Hammerstrom, Donald J., Zhou, Ning, and Lu, Ning. Controller Design of Power Quality-Improving Appliances. United States: N. p., 2007. Web. doi:10.1109/PESC.2007.4342157.
Hammerstrom, Donald J., Zhou, Ning, & Lu, Ning. Controller Design of Power Quality-Improving Appliances. United States. doi:10.1109/PESC.2007.4342157.
Hammerstrom, Donald J., Zhou, Ning, and Lu, Ning. Mon . "Controller Design of Power Quality-Improving Appliances". United States. doi:10.1109/PESC.2007.4342157.
title = {Controller Design of Power Quality-Improving Appliances},
author = {Hammerstrom, Donald J. and Zhou, Ning and Lu, Ning},
abstractNote = {This paper presents an innovative solution to power quality problems -- using power quality improving (PQI) appliances to reduce harmonic currents and improve the power factor in buildings.},
doi = {10.1109/PESC.2007.4342157},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}

Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share:
  • This paper presents an innovative solution to power quality problems using power quality-improving (PQI) appliances. PQI appliances conduct currents that supplement and correct the sum of the other load currents within a premise. From the utility side, the premise housing a PQI appliance thus becomes an improved, if not ideal, utility customer. The PQI appliance improves both harmonic power quality and power factor while performing its normal function, such as heating water. In this paper, the water heater PQI appliance is used as an example to demonstrate the control circuit design and function. Both computer simulation results and laboratory experimentmore » results are presented to demonstrate the effectiveness of the approach. The estimated costs of the PQI controller and of harmonic compensating filters are compared to show that the PQI appliance may be an economic way to provide power quality improvement at the building level.« less
  • The Grid Friendlymore » $$^\textrm{TM}$$ Appliance~(GFA) controller, developed at Pacific Northwest National Laboratory, can autonomously switch off the appliances by detecting the under-frequency events. In this paper, the impacts of curtailing frequency threshold on the performance of frequency responsive GFAs are carefully analyzed first. The current method of selecting curtailing frequency thresholds for GFAs is found to be insufficient to guarantee the desired performance especially when the frequency deviation is shallow. In addition, the power reduction of online GFAs could be so excessive that it can even impact the system response negatively. As a remedy to the deficiency of the current controller design, a different way of selecting curtailing frequency thresholds is proposed to ensure the effectiveness of GFAs in frequency protection. Moreover, it is also proposed to introduce a supervisor at each distribution feeder to monitor the curtailing frequency thresholds of online GFAs and take corrective actions if necessary.« less
  • Design of a robust controller for a Static Var Compensator (SVC) to improve the damping of power system is presented. The main contributions of the paper are to formulate and to solve the power system damping control problem using robust optimization techniques, and to synthesize the controller with explicit consideration of the system operating condition variations. Nonlinear simulations using PSCAD/EMTDC have been conducted to evaluate the performance of the closed-loop system. The results have indicated that the designed controller can provide positive damping to the system under a wide range of operating conditions.
  • This paper discusses hierarchical software design through its application to an example software product. Decomposition of the software product into discrete functional software sub-products is addressed. Potential improvements in managing and performing software quality assurance activities, such as review, inspection and test, are presented. Resulting simplification of software configuration management, product definition, and reusability is discussed. Finally, the hierarchical approach to software design and production is extended to describe a possible software design environment of the future. 3 refs., 4 figs., 3 tabs.
  • The remarkable effectiveness of Japanese practices has led to a growing interest in the US in the development and application of rules and methodologies which attempt to capture design experience. US companies have found unexpected benefits and pitfalls in the application of these rules and methods. In this article, the authors critically examine one of the most widely accepted rules of Design for Manufacturability (DFM): minimize the number of parts. An examination of 240 assemblies and subassemblies has shown that rigid adherence to this rule can lead to unnecessarily complex parts and assembly. Quantitative insights derived from this study havemore » led to a better design goal: minimize and simplify assembly operations. This new rule, which should not be rigidly interpreted, tends to reduce part count, while having the benefit of assuring improved assembly. Another significant advantage of the new design rule is that it results in lower product defect rates as demonstrated by correlations observed for a wide range of products from two different manufacturers. This research links quality to the product concept, enabling a new approach to improving quality at the earliest stages of design.« less