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中文摘要：
为解决高速铁路大容量负荷补偿需要、降低有源补偿装置容量，提出了基于模块化多电平换流器（MMC）与组合式接线变压器相结合的有源补偿INCH牵引供电系统。设计了基于MMC的直挂型潮流控制器（PFC）拓扑结构，并推导了MMC参数计算方法。提出了负序灵活补偿策略，在负序满足国标的前提下节省了有源补偿装置容量。与传统同相牵引供电系统相比，该方法在满足更高的电压等级和功率要求的同时，节省了匹配变压器成本，降低了有源补偿容量。最后给出了系统控制策略，并通过仿真分析验证了所提方案的有效性与正确性。
英文摘要：
In order to solve the compensative problems of high-speed railway large traction loads and to reduce the ca- pacity of active compensation device, we proposed a novel co-phase traction power supply system, which was composed of the modular multilevel converter （MMC） and the combined connection transformer. Then we designed the topology of power flow controller （PFC） based on MMC, andinferred the calculation method of MMC parameters. A flexible control tactics about negative sequence compensation was discussed, which could reduce the capacity of active compensation de- vice when the negative sequence met the demands of National Standards. Compared with traditional co-phase traction power supply systems, the proposed method can achieve higher grade in voltage and power. In addition, it can save the cost of traction matched transformer and reduce the capacity of PFC device. Finally, we put forward the sys- tem control strategies, and verify the correctness and effectiveness of the proposed method by simulation analysis.
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