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过调制区内三电平SVPWM与CBPWM算法的统一性研究

DOI: 10.13334/j.0258-8013.pcsee.2015.08.020, PP. 1993-2002

Keywords: 过调制,三电平,空间矢量脉宽调制,载波脉宽调制,统一性

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Abstract:

有效使用过调制策略可提高直流电压利用率,加快电机的动态响应速度,扩大其稳定运行区域。为了揭示过调制区内三电平空间矢量脉宽调制(spacevectorpulsewidthmodulation,SVPWM)和载波脉宽调制(carrier-basepulsewidthmodulation,CBPWM)算法的内在联系,在分析SVPWM过调制原理的基础上,用两种方法从不同角度推导与SVPWM等效的CBPWM形式。第1种方法根据伏秒平衡原理推导出与SVPWM等效的CBPWM调制函数中应注入的零序分量表达式;第2种方法根据规则采样规律推导出以调制度为自变量的与SVPWM等效的CBPWM整个调制函数形式。理论研究表明:在过调制区内同样可以用CBPWM方法实现与SVPWM相同的效果。仿真和实验结果验证了理论分析的正确性与有效性。

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