三相四桥臂混合五电平逆变器及其3D-SVPWM算法

混合型多电平逆变器可以用较少的开关器件输出更多的电平,常被应用于中频逆变器领域,与传统逆变器相比,具有体积小、成本低、效率高等优点。一种新型的三相四桥臂混合式五电平逆变器拓扑及其abc坐标下的SVPWM调制优化算法被提出,通过将直流端三个电容器的电压按1:2:1的比例调整,可实现输出线电压的9个电压等级。在提高了输出电平的同时,精简了电路结构,降低开关管应力。最后,通过对所提结构和3D-SVPWM算法的仿真和实验结果验证了该方法的性能。

Three-phase Four-leg Hybrid Five-level Inverter and Its 3D-SVPWM Algorithm

Hybrid multilevel inverters can output more levels with fewer switching devices and are often used in the field of medium frequency inverters, which have the advantages of small size, low cost and high efficiency compared with conventional inverters. This article proposes a novel three-phase four leg hybrid five-level inverter topology and SVPWM algorithm in abc coordinate, which can achieve nine voltage levels of output line voltage by adjusting the voltage of the three voltage divider capacitors at the DC terminal to a ratio of 1:2:1. The output level is increased while the circuit structure is streamlined and the switching tube stress is reduced. Finally, the performance of the proposal is verified by simulation and experimental results of the proposed structure and SVPWM algorithm.