基于脉冲调整的四桥臂逆变器死区补偿策略  

Dead-time Compensation Strategy for Four-leg Inverter Based on Pulse-tuning

作　　者：周娟[1] 陈映[1,2] 唐慧英[1] 魏琛[1] 吴璇[1] 

机构地区：[1]中国矿业大学信息与电气工程学院,徐州221008 [2]四川电力设计咨询有限责任公司,成都610041

出　　处：《电工技术学报》2016年第3期16-24,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51407184)

摘　　要：为防止桥臂直通加入死区时间会导致逆变器输出能力下降以及输出波形畸变,需要进行死区补偿。四桥臂逆变器开关状态多,电压矢量分布复杂,死区补偿实现困难。对死区效应及其产生机理进行分析,归纳各相电流极性与对应脉冲调整方案的关系,将基于脉冲调整的死区补偿策略应用于四桥臂逆变器。该补偿策略在同一电流极性下脉冲调整具有一致性,易于实现,仅需判断电流极性即可确定脉冲调整方案,达到校正基矢量作用时间的目的,补偿死区效应。分别在三相平衡及不平衡工况下对基于脉冲调整的四桥臂逆变器死区补偿策略进行仿真和实验分析,结果表明该补偿策略能提高逆变器输出能力,减小波形畸变程度,有效补偿了死区效应。To avoid the short circuit of the bridge, the dead-time is often added, which causes the drop of the output capability and the distortion of the output waveforms, and needs to be compensated. The dead-time compensation of the four-leg inverter is hard to be implemented due to its multiple switch states and complex voltage vectors distribution. The forming mechanism of the dead-time effect is firstly analyzed. Then the relevance between the currents polarities and the corresponding compensation methods are generalized. Afterwards a dead-time compensation strategy based on pulse-tunlng for four-leg inverters is obtained. This compensation strategy has consistency in specific currents polarities. So it is easy to be implemented. The compensation method is determined as long as the currents polarities are distinguished. The dead-time effect is compensated by correcting the duty factors of the base vectors. Simulation and experiment results prove that the proposed compensation strategy is effective in both balanced and unbalanced situation, can raise the output capability, and reduce the waveform distortion.

关 键 词：四桥臂逆变器 三维空间矢量脉宽调制 死区补偿 脉冲调整 

分 类 号：TM464[电气工程—电器]