基于电力电子变压器的新型贯通式同相供电变流器  

New continuous co-phase traction power supply converter system based on power electronic transformer

作　　者：李子欣[1,2] 张航 雷鸣 王哲[1,2] 王平 李耀华 LI Zi-xin;ZHANG Hang;LEI Ming;WANG Zhe;WANG Ping;LI Yao-hua(Key Laboratory of Power Electronics and Electric Drive,Institute of Electrical Engineering,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院电力电子与电气驱动重点实验室,中国科学院电工研究所,北京100190 [2]中国科学院大学,北京100049

出　　处：《电工电能新技术》2018年第5期1-11,共11页Advanced Technology of Electrical Engineering and Energy

摘　　要：本文在对同相供电系统分类研究的基础上提出了一种基于单相-单相电力电子变压器(PET)的新型贯通式同相供电变流器电路拓扑。相对于传统的基于工频变压器的同相供电变流器方案,该拓扑可以取消工频变压器,并大幅减少低频滤波电感数量;相对于模块化多电平变流器(MMC)的方案,所提出的拓扑所需储能电容和低频滤波电感数量均可减少60%以上,而功率半导体数量几乎不变,可显著提升系统功率密度,降低系统造价。此外,当单台PET故障时系统可继续降额运行,而非系统全部停运,可靠性高。本文分析了所提出拓扑的工作原理并设计了控制策略。在所搭建的基于单相-单相PET的20MV·A贯通式牵引同相供电变流器模型上的仿真结果验证了该拓扑的正确性和有效性。In this paper, a novel continuous co-phase power supply converter system is proposed based on single-phase to single-phase power electronic transformer （PET）. Compared with the traditional converter in the continu-ous co？phase traction power supply system that adopts the grid-frequency transformer, this topology greatly reducesthe number of the low frequency inductors with no need of low-frequency transformer. With respect to the MMCtype topology, the proposed system can reduce the quantity of the required storage capacitance and the low-frequen-cy filter inductors by 60% with the same number of power semiconductor devices. Therefore, the proposed solutioncan significantly improve the power density and reduce the cost. In addition, the proposed system has high reliabili-ty and can continue to work even though one of the two PETs fails. The operation principle of the proposed convert-er is analyzed and the control strategy is also designed. The simulation results based on a 20MV·A continuous trac-tion co-phase power supply converter model verify the correctness and effectiveness of the presented solution.

关 键 词：电气化铁路 牵引供电 贯通式同相供电 电力电子变压器 电能质量 

分 类 号：U223.5[交通运输工程—道路与铁道工程]