MRAS异步电机无速度传感器矢量控制低速性能的改善

Improvement of Low Speed Range for the MRAS Speed Sensor-less Vector Control of Induction Motor

异步电机驱动系统中,模型参考自适应(MRAS)无速度传感器矢量控制方法的应用,在低速范围受到定子电压误差的影响。尤其在电压型逆变器供电的情况下,定子电压给定值代替实际值,一定会产生幅值误差和直流偏置,直接影响低速运行的稳定性。为了提高异步电机无速度传感器矢量控制的低速性能,提出了一种定子电压幅值和直流偏置补偿办法。并且通过仿真实验验证了所提出方法的有效性。

The MRAS (model reference adaptive system) speed sensor-less vector control has been widely studied in induction motor system. But its low speed range is easy affected by the stator voltage error, especially when the motor is connected to the voltage inverter. In such case, the reference value of the stator voltage, not the practical value, is used, which will cause amplitude error and DC offset, and affect the stability of low speed directly. This paper presents a new compensation method for stator voltage amplitude and DC offset, which can improve the performance of the speed sensor-less vector control of induction motor. The validity of the proposed method is also verified by simulation.