基于SVPWM的永磁同步电机直接转矩控制系统

PMSM DTC system based on SVPWM

为解决永磁同步电动机直接转矩控制中磁链和转矩脉动的问题,采用将空间矢量脉宽调制与直接转矩控制相结合的控制方法。SVPWM控制技术代替了传统开关方式,不仅实现了电压空间矢量的连续调节而且保证了定子磁链近似为圆形,有效地解决了常规DTC系统电磁转矩脉动较大的问题。仿真结果表明:所提出的控制方法可以在很大程度上降低磁链和转矩脉动,系统具有更好的动态和静态性能。

In order to solve the problems of flux linkage and torque tipple in PMSM DTC system, a control method combining space vector pulse width modulation and direct torque control is adopted. SVPWM control technology re- places the traditional switch table method, which not only achieves the continuous adjustment of the voltage space vector, but also ensures that the stator flux linkage is approximately circular as well as effectively solving the prob- lem of conventional DTC system electromagnetic torque tipple. The simulation results show that the proposed control method can reduce the flux linkage and torque tipple to a great extent, and the system has better dynamic and static performances.