Due to its unreasonable DC voltage distribution, the phase-shifted pulse width modulation (PS-PWM) method cannot be directly applied to equal-ratio and equal-difference hybrid CHB inverters. Thus, these types of inverters lose the double-frequency characteristic of the CHB topology. To preserve this double-frequency characteristic, reduce the switching frequency of the high-voltage cells, and simplify the modulation method. This article proposes an optimized topology for the hybrid CHB inverter by optimizing the distribution of the DC voltage. A hybrid PS-PWM method is also proposed by combing the step-wave modulation method and the PS-PWM method. Theoretical analysis, simulation analysis, and experimental results show that the optimized topology and the hybrid PS-PWM method are both valid and feasible.

由于其直流电压分布不合理，相移脉宽调制（PS-PWM）方法不能直接应用于等比等差混合CHB逆变器。因此，这些类型的逆变器失去了 CHB 拓扑的双频特性。为了保持这种双频特性，降低高压电池的开关频率，并简化调制方法。本文通过优化直流电压的分布，提出了混合 CHB 逆变器的优化拓扑。通过将阶跃波调制方法和PS-PWM方法相结合，还提出了一种混合PS-PWM方法。理论分析、仿真分析和实验结果表明，优化后的拓扑结构和混合PS-PWM方法均有效可行。