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基于三相桥臂坐标的SVPWM过调制方法

, PP. 150-158

Keywords: 三相桥臂,空间电压矢量脉宽调制(SVPWM),过调制,电压利用率

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Abstract:

讨论了一种新型的SVPWM过调制方法,并对其过调制性能及谐波成分进行了分析。首先,对经典SVPWM技术进行了分析,探讨了常规过调制策略的实质。其次,引入了新的三相桥臂坐标,在该坐标下将现有的SVPWM的串行合成时间关系推导为并行。最后,给出了线性调制和过调制统一的求解模型,避免了现有过调制算法中控制角和保持角的计算。新方法取消了扇区的概念并简化了计算,可实现从线性调制到六阶梯模式的连续平滑调制。文中介绍了该过调制算法的基本原理,进行了仿真和实验。结果表明,该方法在线性调制和六阶梯模式下调制效果与经典SVPWM方法相当;而过调制区,其输出PWM波形的THD明显小于常规过调制方法。

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