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PWM电压源逆变器非线性因素迭代学习补偿

DOI: 10.13334/j.0258-8013.pcsee.2015.03.025, PP. 702-709

Keywords: 脉宽调制,电压型逆变器,死区补偿,迭代学习控制,前馈补偿

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Abstract:

脉宽调制(pulsewidthmodulation,PWM)电压源型逆变器(voltagesourceinverter,VSI)的非线性因素会导致输出电压和电流的波形畸变、基波分量幅值减小,其驱动永磁同步电机会造成转矩波动,低速运行不平稳等现象。为了解决VSI非线性因素对永磁同步电机调速系统运行性能的影响,建立上述非线性因素的数学模型,将非线性因素对系统的影响看成一个扰动电压。通过坐标变换和时域到角度域的转换,在同步旋转坐标系下,扰动电压是由关于转子位置的周期扰动和常值扰动组成的。提出在角度域内采用迭代学习和前馈的复合补偿来分别消除周期扰动和常值扰动,该方法无需系统精确模型,实现简单,只需电流传感器。仿真和实验结果标明,所提复合补偿能有效地减小电流谐波,提高低速运行平稳性,且适用于不同转速。

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