一种永磁同步电机驱动系统效率优化方法

An Efficiency Optimization Method for Permanent Magnet Synchronous Motor Drive System

常规永磁同步电机驱动系统效率优化方法中电机功率因素变化值小,搜索时间长。因此,提出了一种工程化的效率优化方法。在低电压穿越工况下,从运行速度和母线电压等多方面考虑构建了一种非线性的载波切换曲线。根据曲线中最高值和最低值来设置调制系数,采用空间矢量脉宽调制方式的控制器在线性区做最大调制。在此基础上调节最优电流角,通过不连续脉宽调制方法将七段式发波规律改为五段式,最终实现永磁同步电机驱动系统效率的优化。通过对比试验发现,与其他两种效率优化方法对比电机驱动系统,提出的工程化的效率优化方法更具优势。

In the conventional efficiency optimization method for permanent magnet synchronous motor drive systems,the variation of motor power factor is small and the search time is long.Therefore,an engineering efficiency optimization method is proposed.Under the low-voltage ride-through condition,a nonlinear carrier switching curve is constructed from various aspects such as operating speed and bus voltage.The modulation coefficient is set according to the highest and lowest values in the curve,and the controller using the space vector pulse width modulation is used to do maximum modulation in the linear region.On this basis,the optimal current angle is adjusted,and the seven-segment waveform generation law is changed to a five-segment waveform through the DPWM method,and finally the optimization of the efficiency of the permanent magnet synchronous motor drive system is realized.Through comparative test,it is found that compared with the other two efficiency optimization methods of motor drive system,the proposed engineering efficiency optimization method is more advantageous.