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SONG Pinggang,ZHOU Zhenbang,LIN Jiatong,DONG Hui.Novel Droop Control Strategy of MMC-RPC with the Combination of Power Coupling and Resistance Ratio[J].JOURNAL OF POWER SUPPLY,2018,16(3):128-136
Novel Droop Control Strategy of MMC-RPC with the Combination of Power Coupling and Resistance Ratio
Received:November 11, 2016  Revised:January 11, 2017
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DOI:10.13234/j.issn.2095-2805.2018.3.128
Keywords:modular multilevel converter  railway power conditioner  droop control  power coupling  power quality
Fund Project:The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)
           
AuthorInstitutionEmail
SONG Pinggang School of Electrical and Automation Engineering, East China Jiaotong University, Nanchang , China
ZHOU Zhenbang School of Electrical and Automation Engineering, East China Jiaotong University, Nanchang , China apabang@qq.com
LIN Jiatong Xiamen Rail Transit Group Co., Ltd, Xiamen , China
DONG Hui School of Electrical and Automation Engineering, East China Jiaotong University, Nanchang , China
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Abstract:
      Energy loss will occur on the transmission line between the railway power conditioner(RPC) and power su-pply arm, which makes the RPC cannot achieve the effective and accurate control of power quality in the traction network. In this paper, the RPC with a structure of modular multilevel converter(MMC-RPC) is adopted as the research object, and its model is built. Afterwards, the P-f and Q-U relationships on AC side are derived, and a traditional droop control mode is established. On this basis, the influence of the transmission line's resistance is considered, and an improved droop control strategy is proposed:the power coupling method is used with the introduction of resistance ratio, which can track the expected power of MMC-RPC more flexibly and effectively. At last, the MMC-RPC system working under the actual working conditions is simulated in MATLAB/Simulink, and simulation results prove that the proposed droop control strategy is effective for the MMC-RPC system; moreover, the comparison of simulation results with the traditional droop control further indicates the advantage of the improved method.
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