Research on Control Strategy of Modular Multilevel Converter based Medium-Voltage Direct Current Traction Power Supply System
Ge Yinbo1, Hu Haitao1, Yang Xiaowei1, He Zhengyou1, Gao Shibin1,2
1. School of Electrical Engineering Southwest Jiaotong University Chengdu 611756 China; 2. National Rail Transit Electrification and Automation Engineering Technique Research Center Southwest Jiaotong University Chengdu 611756 China
Abstract The traditional AC traction power supply system (TPSS) suffers from the problems such as power quality and neutral section. In this paper, the modular multilevel converter (MMC) based medium-voltage direct current (MVDC) TPSS for high-speed railways was studied. For the system operation and control, a coordinated control strategy for parallel operation between traction substations (TSSs) was proposed to restrain the traction network DC voltage fluctuation. Consequently, the traction network DC voltage quality can be improved to make the system more reliable and have higher plug-and-play performance. The small-signal model of the proposed strategy based on simplified equivalent model of MMC was built, and then the small-signal transfer function between the traction network voltage and the output current of TSS was deduced. The influence of TSS output current feed-forward control on the dynamic performance of the system was analyzed. The control system stability in the case of moving load was analyzed. Finally, considering the actual operation condition of TPSS, the simulation model was established and the proposed strategy was verified.
Ge Yinbo,Hu Haitao,Yang Xiaowei等. Research on Control Strategy of Modular Multilevel Converter based Medium-Voltage Direct Current Traction Power Supply System[J]. Transactions of China Electrotechnical Society, 2018, 33(16): 3792-3801.
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2018, Vol. 33 
