Completed Compensation Strategy Research of Railway Power Conditioner for Negative-sequence Current Under Unbalanced AC Power Grids

被引：0
|
作者：
Zhang J. [1 ]
Xu Y. [1 ]
Li Y. [2 ]
机构：
[1] School of Electrical and Automation Engineering, East China Jiaotong University, Nanchang, 330013, Jiangxi Province
[2] State Grid Hunan Electric Power Company Limited Economic & Technical Research Institute, Changsha, 410004, Hunan Province
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2020年 / 40卷 / 10期
关键词：
Completed compensation; Modular multilevel converter (MMC); Negative sequence voltage; Positive and negative components extraction; Railway power conditioner; V/v transformer;
D O I：
10.13334/j.0258-8013.pcsee.191682
中图分类号：
学科分类号：
摘要：
Railway power conditioner (RPC) with traditional compensation strategy can completely compensate the negative sequence current in V/v traction transformer railway system under balanced power grid voltage. However, it is difficult to fully compensate the negative sequence current when there is negative sequence component in power grid voltage. Firstly, this paper studied the completed compensation mechanism that the current flowing through the secondary side of V/v traction transformer should be equal in magnitude and phase difference 120 degrees. Secondly, the mechanism of how negative sequence voltage affects the secondary voltage of V/v traction transformer and RPC compensation performance was analyzed. Thirdly, to completely compensate the negative sequence current, the method of separating the positive and negative sequence voltages based on the secondary side voltage of V/v traction transformer was proposed. In addition, the analytical expressions of reference currents for converters were also derived and presented. Finally, simulation models were built to verify the correctness and effectiveness of the proposed method from the aspects of compensation strategy performance comparison, dynamic and transient response characteristics. © 2020 Chin. Soc. for Elec. Eng.
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页码：3144 / 3153
页数：9
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