模块化多电平变流器型中压直流牵引供电系统控制方法研究  

Research on Control Strategy of Modular Multilevel Converter based Medium-Voltage Direct Current Traction Power Supply System

作　　者：葛银波 胡海涛[1] 杨孝伟 何正友[1] 高仕斌[1,2] Ge Yinbo;Hu Haitao;Yang Xiaowei;He Zhengyou;Gao Shibin(School of Electrical Engineering Southwest Jiaotong University Chengdu 611756 China;National Rail Transit Electrification and Automation Engineering Technique Research Center Southwest Jiaotong University Chengdu 611756 China)

机构地区：[1]西南交通大学电气工程学院,成都611756 [2]国家轨道交通电气化与自动化工程技术研究中心(西南交通大学),成都611756

出　　处：《电工技术学报》2018年第16期3792-3801,共10页Transactions of China Electrotechnical Society

基　　金：中央高校基本科研业务费专项资金(2682017CX041);国家轨道交通电气化与自动化工程技术研究中心公开重点课题(NEEC-2017-A03);中国科协青年托举工程项目(2017QNRC001)资助

摘　　要：针对当前交流电气化铁道存在的电能质量和过分相等问题,研究一种适用于高速铁路的模块化多电平变流器(MMC)型中压直流牵引供电系统(MVDC TPSS)。针对系统运行控制问题,提出一种多牵引变电所(TSS)并联运行协调控制方法,用于抑制牵引网直流电压的波动,提高牵引网直流电压水平,使系统具备更高的可靠性与即插即用性能。从MMC的等效简化模型出发,建立MMC型牵引变电所的控制小信号模型,推导出牵引变电所输出电流与牵引网直流电压间的小信号传递函数,研究输出电流前馈控制对系统动态性能的影响,分析在牵引负荷移动时控制系统的稳定性。最后搭建详细仿真模型,模拟实际牵引供电系统的运行工况,验证所提控制方法的有效性。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.

关 键 词：中压直流牵引供电系统 模块化多电平变流器 小信号模型 电流前馈控制 

分 类 号：TM922.3[电气工程—电力电子与电力传动]