改进的参考电压矢量获取方法

摘要

A new method of reference voltage vector acquisition that did not rely on motor's parameter was proposed for the problem which the change of motor's parameter could made the accuracy of reference voltage vector acquisition unreliable in the PMSM's SVM-DTC method.The PI controllers were used for the error of torque and amplitude of stator linkage,and their output was separately allotted a weight.The weighted sum of their absolute value was used for the control of amplitude of reference voltage vector,and their ratio would be the gist that could compute the angle between reference voltage vector and stator linkage vector.The result of simulation showed that the performance of this method was favourable and the influence making by the change of motor'parameters could be well overcame.The simulation verifies that the method was effective.%针对基于空间矢量调制的永磁同步电机直接转矩控制方法中,参考电压矢量获取涉及电机参数,而电机参数的变化又导致预测结果不可靠的问题,提出了一种不依赖电机参数的参考电压矢量获取方法.通过对转矩误差以及定子磁链幅值误差进行PI控制,对其输出量分别分配一定的权重,用其绝对值的加权,作为参考电压矢量幅值的控制量,用其比值作为确定参考电压矢量相对于定子磁链矢量角度偏差的依据.仿真结果表明,该方法能很好克服电机参数变化造成的影响,从而试验验证了该方法的有效性.