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最小占空比跟踪法及其在五相逆变器双三相电机系统中的应用

, PP. 117-124

Keywords: 双三相电机,五相逆变器,SVPWM,占空比

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Abstract:

为了减少功率开关器件的使用数量,提出了一种针对五相逆变器双三相电机系统的控制方法。首先根据传统的SVPWM方法得到每台三相电机的三相占空比;然后,从线电压角度考虑,跟踪得到满足系统控制要求的最小的五相桥臂占空比;最后,根据等分零矢量的原则得到最终的五相桥臂占空比。由于该方法跟踪最小占空比,因此可以得到各相桥臂的最小占空比。根据五相逆变器双三相电机系统的固有特性,讨论了转速互补和等速恒转矩这两种可能的运行模式。转速互补模式中,通过合理配置高低速,使得双电机系统与单电机系统对直流母线电压的需求基本相同。等速恒转矩模式作为一种容错控制策略,并通过降速的方法使系统维持最大转矩不变。实验结果均验证了所提方法的正确性和两种运行模式的可行性。

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