三相负载不对称的Z源逆变器控制方法研究

Research on Z-source Inverter Control Strategy Under Three-phase Unbalanced Load Conditions

在电源逆变器中,往往存在着负载不平衡的问题。为了解决这个问题,将采用一种新的解决方法,即引入一种新结构的Z源逆变器。在Simulink环境下建立系统仿真模型,采用空间电压脉冲矢量控制策略,构建Z源逆变器直通状态来解决三相不平衡负载的电压不对称导致的各种电器损坏问题。理论结合仿真实验,论证了其正确性。

There is always a problem of unbalanced loads in power inverters. In order to solve this problem,this paper proposes a new solving method by introducing a new structure of Z-source inverter. Set up a system simulation model under Simulink environment. Z-source inverters,whose output voltage can be stepped down or up,does not like traditional buck three-phase inverter due to shoot-through state. The space-vector PWM technique is used to set up shoot-through state of z-source inverter,so as to solve three-phase unbalanced load voltage problem,which leads to the damage of various electric devices. At last,it proves the correctness of the modulation method through simulation and experiment.