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逆变器简化PWM算法及抑制共模电压策略

, PP. 158-165

Keywords: 共模电压,简化PWM算法,分类算法,逆变器

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Abstract:

基于αβ坐标系,结合分类算法对两电平逆变器脉冲宽度调制(PWM)算法进行简化,该简化算法由三相参考电压直接判断参考电压矢量所处的扇区,并获取器件开关时刻。在分析死区时间对各桥臂开关动作时刻影响的基础上,通过调整开关器件切换时刻,解决因死区时间的存在造成抑制共模电压调制算法失效的问题,消除了共模尖峰电压。仿真和实验结果验证了简化PWM调制算法的正确性,且改进后的抑制共模电压调制策略能有效地减小共模电压。

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