基于SVPWM的永磁同步电机直接转矩控制

针对永磁同步电机直接转矩、控制系统转矩和定子磁链的脉动问题，设计了基于电压空间矢量脉宽调制(SVPWM)策略的永磁同步电机直接转矩控制.在每个控制周期内，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作用时间，然后利用线性组合法将其合成为新的电压矢量.在MATLAB/SIMULINK仿真环境下，对该控制系统进行了建模与仿真.仿真结果表明，该方法可以明显减小转矩和磁链脉动，具有更好的动、静态性能，而且响应速度快，运行平稳.

Direct torque control for permanent magnet synchronous motor based on space voltage vector pulse width modulation

To solve the problem of torque and stator flux linkage ripples in direct torque control(DTC) for a permanent magnet synchronous motor(PMSM),the space voltage vector pulse width modulation(SVPWM) strategy in DTC for PMSM was designed.The offset between the reference stator flux linkage and the estimated one 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.The modeling and simulation of this system were introduced based on MATLAB/SIMULINK.Simulation results show that the present method can dramatically reduce the torque and the stator flux linkage ripples.The system has better dynamic and steady state performances,fast response and stable operation.