永磁同步电机的级联自适应扰动观测器控制策略

受电压源逆变器非线性特性的影响,转速控制通常不能精确抑制齿槽转矩。为精确补偿齿槽转矩,提高永磁同步电机转速控制精度,提出一种级联自适应扰动观测器控制策略。首先,采用参考电流指令建立了同步旋转坐标系下逆变器死区电压模型,并通过自适应扰动观测器对其进行补偿。然后,针对齿槽转矩为转子位置的周期函数的特点,设计了速度环自适应扰动观测器,实现了对齿槽转矩的有效补偿,所提控制策略只需已知电机参数的界。仿真结果表明,所提出的控制策略能够有效抑制电机齿槽转矩、提高转速控制精度。

A Cascade Adaptive Disturbance Observer Control Strategy for Permanent Magnet Synchronous Motor

The speed controller can not suppress the cogging torque accurately due to the nonlinearity of the voltage source inverter(VSI).In order to compensate the cogging torque effectively and to control the speed of permanent magnet synchronous motor accu?rately,a cascade adaptive disturbance observer control strategy is proposed.First,the reference current commands are used to mod?el the VSI deadtime voltages in the synchronous rotating reference frame.An adaptive disturbance observer in the current loop is designed to compensate the deadtime voltages.The cogging torque is the periodic function of the rotor position.Then,considered this characteristic of the cogging torque,an adaptive disturbance observer is proposed to compensate it effectively.The presented control strategy need only know the boundaries of the motor parameters.The simulation results show that the proposed control strat?egy can suppress the cogging torque effectively,and the speed control accuracy is enhanced.