一种H桥级联型多电平逆变器SVPWM通用算法实现

General SVPWM Algorithm of H-bridge Cascaded Multi-level Inverter

为解决多电平逆变器SVPWM控制策略实现的复杂问题,采用了一种简单通用的SVPWM算法。此算法基于g-h坐标系,容易确定参考矢量的位置和作用时间,采用开关状态等效法使多电平和两电平的调制策略相一致,降低了器件的开关频率,且此算法可以直接应用于任意电平逆变器系统中。结合3电平H桥级联拓扑开展了仿真和实验研究,仿真和实验结果证明了方法的有效性。

In order to solve the complexity of achieving the multilevel inverter SVPWM strategy,a simple and general SVPWM algorithm was analyzed. Based on gh coordinate system, the algorithm can easily determine the location and executive time of the reference vector. By analyzing the switching state equivalent method, the multilevel control strategy is consistent with two level strategy. More importantly, the algorithm can be applied to any level inverter system directly. The algorithm was applied in the three level H bridge cascade topology. Simulation and experimental results show that the method is effective.