基于电流滞环控制的H桥级联型逆变器新型调制方法

A New Modulation Method Based on Current Hysteresis Control for Cascaded H-Bridge Inverter

首先介绍了H桥级联型逆变器常用的载波相移SPWM调制方法,基于相移原理与电流滞环控制提出了一种适用于H桥级联型逆变器的新型调制方法。其具有以下特点:①单个H桥采用与单极性SPWM调制相似的单极性电流滞环控制,脉冲产生简单,可以有效减少开关损耗;②通过动态调整滞环宽度来实现电流滞环控制时功率器件开关频率恒定,从而可以用类似相移SPWM脉冲产生方式来实现电流滞环控制时H桥级联型逆变器一相多H桥移相控制脉冲的产生。最后仿真与实验结果验证了本文所提方法的正确性。

This paper first introduces the commonly used carrier phase shift SPWM modulation method for cascaded H-bridge inverter. Based on the principle of phase shift and current hysteresis control, a new modulation method is proposed for cascaded inverter.It has the following characteristics： O~）The control method is similar to unipolar SPWM modulation for a single H bridge.It is simple for pulse generator and can effectively reduce the switching losses. @The phase-shifted control pulse for multi H bridges of a phase with current hysteresis control can be generated which is similar to the phase shift SPWM by dynamically adjusting the width of hysteresis to keep power device switching frequency constant.At last, the simulation and experimental results verify the correctness of the proposed method.