基于SVPWM的永磁同步电动机直接转矩控制

针对永磁同步电动机直接转矩控制系统转矩和定子磁链脉动问题,采用电压空间矢量脉宽调制(SVPWM)的永磁同步电动机直接转矩控制方法。根据在每一个控制周期内,计算出参考磁链和所估计磁链的偏差,选择相邻非零矢量和零矢量,并精确地计算出各自的作用时间,然后利用线性组合法将其合成为新的电压矢量。仿真结果表明,所提出的控制方案是有效的,明显地改善转矩和磁链脉动,并且有很好的动态和稳态性能。

Direct Torque Control for Permanent Magnet Synchronous Motor Drive Based on Voltage Space Vector Pulse Width Modulation

To solve the problem of the torque and the stator flux linkage dpples of direct torque control （DTC） for a permanent magnet synchronous motor （PMSM）, the space volt- ages vector pulse width modulation （SVPWM） of for permanent magnet synchronous motor DTC system is designed. Its principle is that the offset between the reference stator flux linkage and the estimated stator flux linkage is calculated during each sampling period, and the two nonzero neighboring voltage vectors are selected and then the operating time is calculated accurately. Finally the linear combination method is utilized to synthesize a new voltage vector. Simulation results show that the proposed control scheme can dramatically reduce the torque and the stator flux linkage ripples and it has better dynamic and steady state performance.