改进的MRAS无速度传感器VC控制系统仿真研究

Simulation Research of Vector Control System Based on Improved MRAS Speed Sensorless

针对交流传动系统中异步电机的精确控制和速度辨识等问题,在Simulink软件环境中,对基于模型参考自适应系统(MRAS)无速度传感器的异步电机的矢量控制(VC)系统进行了研究。系统采用按转子磁场定向的VC对异步电机进行控制,通过MRAS辨识算法估算电机转速,由Popov超稳定定理对磁链偏差进行收敛。由于速度辨识算法中电压模型的纯积分环节会引起误差积累和漂移问题,故采用改进积分型转子磁链估算模型来解决这一问题。仿真结果表明,速度辨识方法能够准确推算出电机转速,控制系统动态响应快、稳态静差小、抗负载扰动能力强,具有良好的动静态控制性能。

Aiming at the issues existing in AC transmission system, e. g. , precise control and speed recognition for asynchronous motor, under Simulink software environment, the vector control （ VC ） system of asynchronous motor based on module reference adaptive system （ MRAS ） speed sensorless is researched. By adopting rotor magnetic field oriented VC, the asynchronous motor is controlled ; the rotating speed of motor is estimated with MRAS recognition algorithm, and the deviation of magnetic flux linkage is converged by Popov theorem. Due to the accumulation and drift of errors may be caused by the pure integral element of voltage model in speed recognition algorithm, thus the improved integral rotor magnetic flux linkage estimation model is adopted to solve the problem. The simulation result verifies that the rotating speed of motor can be precisely derived by speed recognition method; and the control system features fast dynamic response, small steady-state error, and strong capability of anti-disturbance of load, and it possesses good static and dynamic control performance.