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双三相感应电机新型空间矢量脉宽调制策略研究

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Keywords: 双三相感应电机,空间矢量脉宽调制,抑制谐波,分类算法,过调制

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Abstract:

电压源型逆变器驱动双三相感应电机时共有64种开关状态,电压调制算法复杂。基于分类算法提出了一种十二边形空间矢量脉冲宽度调制(spacevectorpulsewidthmodulation,SVPWM)策略。与其他研究相比,该新型调制策略可有效缩短算法处理时间,扩展调制区域。算法对输入的电压进行分类,获取最大和次大的中间变量,从而判断参考电压矢量所在扇区;对中间变量进行线性组合可求得基本矢量作用时间,从而缩短算法处理时间。该算法通过将调制区域分为3段,可实现线性调制区域向过调制区域的平滑过渡。仿真和实验结果表明,线性调制区可抑制定子电流谐波;过调制区可补偿十二边形外电压矢量损失。

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