一种改进的级联H桥整流器直流电压平衡策略

直流电压平衡策略是级联整流器控制中一个重要的组成部分。比例式脉冲补偿平衡策略是一种典型的电压平衡策略,它可以较好地实现特定工况下的直流电压平衡,但是其平衡效果会受到负载电流大小影响,在不同负载工况下难以自适应。基于这种比例式脉冲补偿平衡策略,通过对电路模型进行分析,提出一种改进电压平衡策略,将负载电流引入调节范围,使整流器在不同负载工况下都能很好地实现直流电压平衡。仿真和实验验证了改进电压平衡策略的有效性。

An Advanced DC Voltage Balance Strategy for Cascaded H-Bridge Rectifier

DC voltage balance control strategy is one of important parts in cascaded H-bridge rectifier control. Due to the good performance under certain conditions, proportional pulse compensation strategy for voltage balancing is a typical strategy. However, its balancing effect will be influenced by load current of the rectifier, which is difficult to realize self-adaptation for various load conditions. Therefore, an advanced voltage balance method based on the proportional pulse compensation strategy is proposed in this paper. The load current is introduced into the regulator to obtain good performance under different load conditions. Simulation and experimental results verify the proposed improved strategy.