基于开关复用型子模块的电力电子变压器及其控制策略  

Power electric transformer and its control strategy based on sub-modules with duplicated switches

作　　者：张宸宇 袁宇波 袁晓冬 杨景刚 张哲 许崇福 ZHANG Chenyu;YUAN Yubo;YUAN Xiaodong;YANG Jinggang;ZHANG Zhe;XU Chongfu(State Grid Jiangsu Electric Power Co.,Ltd.Research Institute,Nanjing 211103,China;Xi′an XD Power System Co.,Ltd.,Xi′an 710065,China)

机构地区：[1]国网江苏省电力有限公司电力科学研究院,江苏南京211103 [2]西安西电电力系统有限公司,陕西西安710065

出　　处：《电力工程技术》2021年第5期100-106,共7页Electric Power Engineering Technology

基　　金：国家重点研发计划资助项目(2017YFB0903300)。

摘　　要：直流配电系统一般采用双极性供电形式,其中真双极接线形式在故障工况下正、负极可单独运行,但成本较高,适用于对可靠性要求较高的场合。为实现电力电子变压器在真双极接线形式的直流配电系统中的应用并有效降低装置成本,文中提出了一种基于开关复用型子模块的电力电子变压器拓扑,并对其工作原理和控制策略进行分析。所提电力电子变压器控制包括低压端口电压控制和电压均衡控制,电压均衡控制器和低压端口电压控制器相互解耦,方便独立设计。相比传统真双极接线形式,所提子模块中双有源桥和电压均衡电路之间功率开关实现了有效复用,能够有效降低系统成本,提高功率密度。仿真结果验证了所提控制策略的正确性和有效性。The DC power distribution system usually adopts bipolar power supply mode,which is suitable for occasions with independent positive and negative load and high reliability requirements.In order to realize the application of power electronic transformer in real bipolar low voltage DC system,a power electronic transformer topology based on switching multiplexing sub-module is proposed,and its working principle and control strategy are analyzed.The proposed power electronic transformer control includes low-voltage port voltage control and voltage equalization control.The voltage equalization controller and the low-voltage port voltage controller are mutually decoupled to facilitate independent design.Compared with the traditional true bipolar wiring form,the effective multiplexing of power switches between double active bridges and voltage equalization circuits in the proposed sub-module effectively reduces system cost and improve power density.The simulation results verify the correctness and effectiveness of the proposed control strategy.

关 键 词：电力电子变压器 双有源桥 真双极 电压均衡 开关复用 低压端口电压控制 

分 类 号：TM46[电气工程—电器]