五相永磁同步电机三次谐波电流控制比较研究

A compare research on third harmonic current control for five-phase permanent magnet synchronous motor

三次谐波电流的注入可以有效提高五相永磁同步电机电磁转矩的输出。以铜耗不变和最大电流不变为约束条件,分析了2种约束条件下三次谐波电流与基波电流之间的比值对电磁转矩的影响。通过分析可知,当采用基于铜耗不变作为约束条件时,三次谐波电流参考值等于ψf3/ψf倍的基波电流参考值时,电磁转矩最大;当采用基于最大电流不变作为约束条件时,三次谐波电流幅值为基波电流的k w/(6k w-k w3/3)倍时,电磁转矩最大。在此基础上,根据基础电压矢量幅值、相位以及作用时间给出了3种空间矢量脉宽调制技术的最大基波电压利用率随V ref3/V ref1的变化趋势。最后,通过实验平台对比了3种空间矢量脉宽调制计算方法分别工作于2种约束条件下的控制效果。

The injection of a third harmonic current can improve the electromagnetic torque output of the five-phase permanent magnet synchronous motor.In this paper,constant copper consumption and constant maximum current are used as constraints,and the influence of the ratio between the third harmonic current and the fundamental current on the electromagnetic torque under the two constraints is analyzed.The electromagnetic torque is the largest when the third harmonic current reference value is equal to the fundamental current reference value ofψf3/ψf times under the premise of the constant copper loss.On the premise that the maximum current is constant,the electromagnetic torque is the largest when the third harmonic current reference value is equal to the fundamental current reference value of k w/(6k w-k w3/3)times.On this basis,according to the vector amplitude,phase and action time,the changing trends of maximum voltage utilization rate with V ref3/V ref1 under three different kinds of methods are given.Finally,through the experimental platform,the control effects of the three kinds of SVPWM are compared under two constraint conditions.