Virtual neutral point selection for three-leg railway power quality conditioner

With the development of series connection of IGBTs, the transformerless high-voltage converter becomes an important type utilized in power quality improvement applications. Electric railway is a kind of unbalanced load and the compensators based on three-leg converters are potential solutions for it...

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Bibliographic Details
Published in2013 IEEE Energy Conversion Congress and Exposition pp. 5237 - 5239
Main Authors Zhang Chunpeng, Jiang Qirong, Tian Xu, Wei Yingdong
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.09.2013
Subjects
Insulated gate bipolar transistors
Mathematical model
Power quality
Rail transportation
Rails
Reactive power
Voltage control
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Summary:With the development of series connection of IGBTs, the transformerless high-voltage converter becomes an important type utilized in power quality improvement applications. Electric railway is a kind of unbalanced load and the compensators based on three-leg converters are potential solutions for it. This paper proposes a modeling method for three-leg railway power quality conditioner, by means of selecting a virtual neutral point. This method, compared with conventional ways, replaces the two higher actual phase voltages by three lower virtual ones, which helps the converter lower the requirement of dc-link voltage level and the number of series-connected devices by about 30%. Simulation results prove that the control strategy based on this new model represents satisfying performances.
ISSN:2329-3721
2329-3748
DOI:10.1109/ECCE.2013.6647409