CHB逆变器3N+1与SVM容错切换  

3N+1 and SVM Fault-tolerant Switching of CHB Inverter

作　　者：张影 祝杰 王宁 田诗雯 陈曲 ZHANG Ying;ZHU Jie;WANG Ning;TIAN Shiwen;CHEN Qu(Jinzhou Power Supply Company,State Grid Liaoning Electrical Power Co.,Ltd.,Jinzhou 121000,Liaoning,China)

机构地区：[1]国网辽宁省电力有限公司锦州供电公司,辽宁锦州121000

出　　处：《电气传动》2020年第12期21-26,共6页Electric Drive

摘　　要：多电平逆变器的开关器件一旦发生故障,会造成输出电压不对称,系统运行负担加剧等不良影响。将3N+1冗余和空间矢量调制(SVM)应用于多电平级联H桥(CHB)逆变器实现开关故障的容错控制,平衡故障引起的直流偏移,稳定逆变器的运行。根据不同开关故障类型的无效空间矢量分布,判断是否需要插入冗余单元以及冗余单元是否发挥直流电压的作用,再选择有效开关状态控制开关器件的通断平衡线电压和负载电压。提出的方案能够提高故障CHB逆变器的最大输出电压和可靠性。仿真和实验结果验证了提出的容错策略的有效性。Switching device of multi-level inverter once the fault occurs,and it will cause the output voltage asymmetry,system operation burden increased and other adverse effects.The 3N+1 redundancy and space vector modulation(SVM)was applied to the multi-level cascade H-bridge(CHB)inverter to realize the fault-tolerant control of the switch failure,balanced DC offset caused by the fault,and stabilized operation of the inverter.According to the different switch fault typesinvalid space vector distribution,judging whether need to insert redundancy and whether the redundancy units play the role of DC voltage,and then the valid switching states were selected to control switches on-off balancing line-to-line voltage and load voltage.The proposed scheme can improve the maximum output voltage and reliability of the fault CHB inverter.The results of simulation and experiment verify the effectiveness of the proposed fault tolerance strategy.

关 键 词：级联H桥逆变器 空间矢量调制 直流偏移 3N+1冗余 有效开关状态 

分 类 号：TM464[电气工程—电器]