Study on the Control Method and the Uninterrupted Phase-Separation Passing System with Voltage Compensation Function
Yuan Jiaxin1, 2, Ni Zhou1, Xiao Feiran1, Min Yongzhi2
1. School of Electrical Engineering and Automation Wuhan University Wuhan 430072 China; 2. School of Electrical Engineering and Automation Lanzhou Jiaotong University Lanzhou 730070 China
Abstract The uninterrupted phase-separation passing system can ensure the continuous power supply of locomotive without speed reduction and voltage and current impact. In order to further improve the reliability of the uninterrupted phase-separation passing system and the voltage fluctuation at the end of the traction power supply network, a uninterrupted power transfer system (UPT) based on three-phase MMC and its control strategy are proposed. Firstly, the UPT topology and working principle of the phase separation zone based on three-phase MMC are studied; secondly, the voltage fluctuation principle at the end of traction network caused by locomotive passing through the neutral section and the reactive voltage compensation ability of UPT are analyzed. Then, during the whole process of locomotive passing through the neutral section, the current transmission characteristics of UPT are proposed to ensure the linear change of active load on both sides. Next, the active and reactive power of UPT and the overall control strategy are proposed. Finally, simulation analysis and small capacity experiment are carried out. The theoretical analysis and test results show that the UPT can ensure that the locomotive can smoothly pass through the neutral section without power failure, and the load of traction power supply arms on both sides can realize linear and stable change, and effectively solve the problem of voltage fluctuation.
Yuan Jiaxin,Ni Zhou,Xiao Feiran等. Study on the Control Method and the Uninterrupted Phase-Separation Passing System with Voltage Compensation Function[J]. Transactions of China Electrotechnical Society, 2021, 36(5): 1084-1095.
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2021, Vol. 36 
