一种有源中点钳位五电平逆变器简化等效空间矢量调制策略  

A Simplified Equivalent SVPWM Strategy for Active Neutral Point Clamped Five-level Inverter

作　　者：刘计龙[1] 李科峰 肖飞[1] 麦志勤[1] 付康壮 连传强 LIU Jilong;LI Kefeng;XIAO Fei;MAI Zhiqin;FU Kangzhuang;LIAN Chuanqiang(National Key Laboratory of Science and Technology on Vessel Integrated Power System(Naval University of Engineering),Wuhan 430033,Hubei Province,China)

机构地区：[1]舰船综合电力技术国防科技重点实验室(海军工程大学),湖北省武汉市430033

出　　处：《中国电机工程学报》2022年第17期6410-6424,共15页Proceedings of the CSEE

基　　金：国防科技卓越青年基金项目(2018-JCJQ-ZQ-002)。

摘　　要：针对有源中点钳位五电平(active neutral-point-clamped five-level,ANPC-5L)逆变器传统空间矢量调制策略中存在的“计算复杂、无法避开寄生模态”等问题,提出一种实现简便且能够避开寄生模态的简化等效空间矢量调制(space vectorpulsewidthmodulation,SVPWM)策略。所提策略参照两电平SVPWM的载波实现方法生成马鞍形调制信号,经过简单计算后与载波信号比较,得到开关管驱动信号,输出期望的电压波形。一方面,通过优化开关模态切换图,避开因死区产生的寄生模态,改善逆变器输出谐波特性;另一方面,通过合理选择冗余模态,向调制信号注入零序电压,实现ANPC-5L逆变器悬浮电容电压和支撑电容中点电位的解耦控制。所提策略不会增加开关管的开关频率,因此不会产生额外的损耗,产生的共模电压较小,避免电磁干扰等问题。最后,仿真和实验结果验证所提策略的有效性。To solve the problems of high computational complexity and inevitable parasitic modes in traditional space vector pulse width modulation(SVPWM) of active neutral-point-clamped five-level(ANPC-5L) inverter, a simplified equivalent SVPWM strategy was proposed, which could avoid parasitic modes. In the proposed strategy,saddle-shaped modulation signal was generated by utilizing the carrier method of 2-level SVPWM and was compared with the carrier signal after simple calculation. Then, the driving signal was obtained and the desired voltage waveform was output. On the one hand, by optimizing the switch mode transition diagram, the parasitic mode caused by dead zone could be eliminated and the output harmonic characteristics of the inverter could be improved. On the other hand, by properly selecting redundant modes and injecting zero-sequence voltage into modulation signal, the decoupling control of the floating capacitor voltage and neutral point potential of the DC-link capacitor could be realized. Moreover, the proposed strategy does not increase the switching frequency of switch components, so no extra losses are generated. Due to the less common-mode voltage produced by the proposed strategy,problems such as electromagnetic interference could be avoided. The validity of the proposed strategy was proved by the simulation and experimental results.

关 键 词：有源中点钳位 五电平 空间矢量调制 寄生模态 电容电压控制 

分 类 号：TM464[电气工程—电器]