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A Multilevel Railway Power Conditioner System Based on YNvd Trans-former
Received:April 26, 2018  Revised:May 30, 2018
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Keywords:railway power conditioner (RPC)  modular multilevel converter (MMC)  balanced transformer  negative sequence current  harmonic  hierarchical control
Fund Project:Natural Science Foundation of China(51477046)
luolongfu llf_hnu@163.com
zhoujingxuan College of Electrical and Information Engineering, Hunan University 510629676@qq.com
tianye College of Electrical and Information Engineering, Hunan University
yanyafei College of Electrical and Information Engineering, Hunan University
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      In order to solve the power quality problem of negative sequence current and harmonic current in high-speed railway power supply system, a railway power conditioner system based on YNvd balance transformer is proposed in this paper. This system adopts a novel multilevel railway power conditioner(MRPC)which consists of four H-Bridge links and corresponding output filter inductors. Different from the conventional railway power conditioner based compensation systems, this system integrates MRPC into the phase-β side flexible taps of YNvd balance transformer instead of into phase-b side feeder via a step-down transformer, thus the initial costs are reduced significantly. The topology struc-ture, the equivalent model and the compensation principle are analyzed, furthermore, this paper comes up with the hierarchical control on com-mand current, circulating current restrainingand and link voltage balance. The simulation results show the feasibility and effectiveness of the proposed system.