基于积分滑模的感应电机无速度传感器带速重投控制策略

A Restart Method Based on Integral Sliding Mode for Speed Sensorless Controlled Induction Motor

轨道交通车辆在过分相或无电区过程中将逆变器脉冲封锁,车辆进入惰行工况,惰行结束后再次起动逆变器进行牵引电机的带速重投。在采用无速度传感器控制时,由于重投时刻电机的实际速度未知,带速重投成为需要解决的关键问题。本文提出一种基于积分滑模的感应电机无速度传感器带速重投控制策略。建立基于转子反电动势的非线性系统模型,设计积分滑模控制策略,准确估算电机在重投时的初始转速,并采用合理的切换函数减小系统抖振。理论分析积分滑模控制的稳定性和对电机转子时间常数的鲁棒性。仿真和实验验证了该方法的有效性,并和原有的输入输出线性化方法进行对比,仿真和实验结果表明该方法在带速重投过程中具有更好的动态性能和良好的鲁棒性。

The inverter is turned off during the phase-splitter or no-voltage section when the railway vehicle enters coasting condition.After the coasting condition ends,the inverter is turned on and the traction motor is restarted.Since the actual speed is unknown,restart at coasting condition is the key problem for the speed sensorless control of the traction motor.A restart method based on integral sliding mode(ISM)is proposed in this paper.The nonlinear system model based on the rotor back-EMF is built.The integral sliding mode control is designed to estimate the initial speed of induction motor during restart at coasting condition.Meanwhile,a reasonable switching function is designed to alleviate chattering phenomenon.The stability of control system and robustness to the motor rotor time constant are analyzed.Simulations and experiments have verified the proposed method.Compared with the existing input-output linearization method,it is shown that the proposed method has better dynamic performance and great robustness.