一种改进型超前角弱磁控制算法

针对表贴式永磁同步电机弱磁控制中随负载增大易产生的速度响应动态过程电流震荡,速度稳态误差和稳态时速度波动变大的问题,本文在分析传统超前角弱磁控制算法原理的基础上,将动态和稳态性能变差的原因分别归结于SVPWM逆变器电压输出能力不足和弱磁阶段的电压闭环控制,提出一种改进型超前角弱磁控制算法.此方法采用一种运算量小的SVPWM过调制算法,同时使用q轴电流误差闭环代替电压闭环的弱磁控制策略.实验结果表明,改进型超前角弱磁控制算法可以有效地减小动态过程的电流震荡,避免加载时的稳态速度下降,且稳态速度波动小,从而提高了表贴式永磁同步电机弱磁阶段的带载能力.

Improved leading angle flux weakening control algorithm

In order to solve the problem that in the flux weakening region of surface-mounted permanent magnet synchronous motor(SPMSM),the oscillation of current in dynamic process and the steady-state error of speed grew with load increasing,an improved leading angle flux weakening control algorithm is proposed.By analyzing the mechanism of the traditional algorithm,the conclusion is that the insufficient voltage output capacity of SVPWM inverter and the voltage close-loop control for the flux weakening control are the main cause.A SVPWM over modulation algorithm with a small amount of computation and the close-loop control based on q axis current error instead of voltage were adopted in the improved algorithm.The experiment results show that the improved leading angle flux weakening control algorithm can decrease the vibration of current in dynamic process and the fluctuation of steady-state speed effectively,and meanwhile the speed steady-state error is removed,so that the load capacity of SPMSM in flux weakening region is enhanced.