DocumentCode :
2483179
Title :
Case study of a unique power quality problem and solution. Application of a damped harmonic filter to a cycloconverter
Author :
Baier, M. ; Sheppard, J.
Author_Institution :
Westinghouse Power Syst. Services, Oakdale, PA, USA
fYear :
1996
fDate :
6-9 May 1996
Firstpage :
117
Lastpage :
122
Abstract :
As detailed in numerous references, variable speed drives cause degradation of power quality by distorting current and voltage waveforms in the distribution systems. Commonly applied solutions incorporate devices of a passive shunt filter design connected at the nearest power distribution bus. Apart from improving harmonic distortion at the point of their connection, such filters, consisting of capacitors, also provide necessary power factor correction to the application. Cycloconverters represent a special type of variable speed AC drive. Most commonly applied variable speed drives, such as variable frequency and variable speed DC drives, produce harmonics at their characteristic frequencies. These frequencies are essentially constant in time. In addition to the characteristic frequencies, cycloconverter spectra also contain frequencies that vary with the output converter frequency. Therefore, when passive harmonic filtering is considered for a cycloconverter application, special precautions have to be observed. It is the intent of this paper to discuss such an approach based on an example of an actual filter design. The motivation for the filter application was similar to most situations; to reduce the electrical costs by improving the power factor and to prevent equipment misoperation due to poor power quality. While the goal was common, the solution was not. The case study is detailed in the following steps: data collection and analysis, problem and solution identification, detailed filter engineering, implementation, and verification
Keywords :
AC motor drives; DC motor drives; cycloconvertors; damping; distribution networks; passive filters; power factor correction; power supply quality; power system harmonics; variable speed drives; capacitors; current waveforms distortion; cycloconverter; cycloconverter spectra; damped harmonic filter; distribution systems; electrical costs reduction; harmonic distortion improvement; output converter frequency; passive harmonic filtering; passive shunt filter; power distribution bus; power factor correction; power quality problem; variable frequency drives; variable speed DC drives; variable speed drives; voltage waveforms distortion; Capacitors; Degradation; Frequency conversion; Harmonic distortion; Passive filters; Power distribution; Power harmonic filters; Power quality; Variable speed drives; Voltage;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Industrial and Commercial Power Systems Technical Conference, 1996. Conference Record, Papers Presented at the 1996 Annual Meeting., IEEE 1996
Conference_Location :
New Orleans, LA
Print_ISBN :
0-7803-3263-6
Type :
conf
DOI :
10.1109/ICPS.1996.533945
Filename :
533945
Link To Document :
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