基于改进积分器SVPWM-DTC永磁同步电机系统仿真研究

Simulation of SVPWM-DTC of permanent magnet synchronous motor based on modified integrator

结合空间矢量脉宽调制技术和一种改进的幅值限定补偿积分器,实现永磁同步电机直接转矩控制,通过改进的幅值限定补偿器调整幅值,保证磁链相位恒定,消除定子磁链稳态误差.该方法实现了转矩和磁链的无差控制,提高了磁链观测器精确度和直流电压利用率,使系统性能更加优越.仿真实验证明了控制系统的响应速度更快、转矩脉动更小,性能明显得到改善,同时证明了该模型的有效性.

The method of direct torque control of permanent magnet synchronous motor can be achieved by using space vector pulse width modulation and a modified integrator with an amplitude.The integra-tor can adjust amplitude,keep the angle unchanged and avoid other mistakes to the steady state flux. The method realizes no difference control on torque and flux,improves the precision of flux observer and utilization percent of direct voltage,and makes system performance superior.Simulation and experiments show that the performance of control system is greatly improved,it gets faster response speed and smal-ler torque pulsation.The significance of the model is proved.