容错控制模式下三电平逆变器输出电压不平衡抑制方法  

Suppression Algorithm for Output Voltage Unbalance of Three-Level Inverters under Fault Tolerant Operation

作　　者：张铭 郭源博[2] 李泽 张晓华[1,2] Zhang Ming;Guo Yuanbo;Li Ze;Zhang Xiaohua(School of Electrical Engineering&Automation Harbin Institute of Technology Harbin 150001 China;School of Electrical Engineering Dalian University of Technology Dalian 116024 China)

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,哈尔滨150001 [2]大连理工大学电气工程学院,大连116024

出　　处：《电工技术学报》2018年第22期5300-5310,共11页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51377013;51407023)

摘　　要：容错控制技术作为提高系统可靠性的一种重要方法,在工程领域得到了广泛应用;在中大功率电力电子控制领域,针对NPC型三电平逆变器容错控制拓扑的中点电压波动问题,目前研究尚未涉及。本文以八开关三相逆变器为三电平容错拓扑方案,首先证明容错拓扑中中点电压波动存在的必然性;其次,推导证明中点电压波动对逆变器输出侧的影响,即会导致输出电压的三相不平衡;最后,提出一种基于改进SVPWM的输出不平衡抑制策略,该策略能够在中点电压波动时,保证输出电压的三相平衡。实验结果证明,所提出的抑制策略能够对中点电压波动导致的输出不平衡起到明显的抑制效果,调节时间在一个调制周期内。In medium and high power drive application,the fault tolerance of three-level neutralpoint-clamped(NPC)inverter has been deeply studied.However,the neutral-point(NP)voltage fluctuation of three-level NPC inverter under fault-tolerant operation is seldom discussed.Using eight-switch three-phase inverter(ESTPI)as the fault-tolerant topology,this paper firstly proves that the existence of NP voltage unbalance is inevitable.Furthermore,the fluctuation of NP voltage will cause the three-phase unbalance of output voltage.Thus,a suppression strategy for output voltage is proposed considering the NP voltage fluctuation.Experimental results show that the proposed method can suppress the three-phase unbalance of output voltage effectively,and the adjustment time is within one modulation period.

关 键 词：中点钳位式三电平逆变器 容错控制 中点电压波动 输出电压不平衡抑制 

分 类 号：TM464[电气工程—电器]