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A Multilevel Railway Power Conditioner System Based on YNvd Trans-former
Received:April 26, 2018  Revised:June 18, 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 was proposed in this paper. This system adopted 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 integrated 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 were reduced significantly. The topology structure, the equivalent model and the compensation principle were analyzed, furthermore, this paper came up with the hierarchical control on command current, circulating current restrainingand and link voltage balance. The simulation results showed the feasibility and effectiveness of the proposed system.