基于滑模控制的异步电机无速度传感器DTC研究

摘要

A sliding mode observer for speed sensorless DTC of induction motor is presented. The observer is built on the state equation with using the most of its characteristics, and there are no rotor time constants and speed information involved in estimating rotor flux, thus the observer＇s robustness to parameter error is better. Combined the observer and SVPWM, the performance of the system has been promoted. Simulation results demonstrate the effectiveness and robustness of the proposed algorithm.%建立了一种滑模速度观测器,用于电机转速的精确观测。该观测器充分利用电机状态方程具有的结构特点,设计出简单有效的速度估算方法,在转子磁链的估算中无须用到转子时间常数和转速等信息,提高了观测器对于参数误差的鲁棒性。将所建立的观测器和空间电压矢量脉宽调制技术（SVPWM）结合对电机进行控制,进一步提高了系统的调速性能。仿真结果验证了基于滑模控制理论的异步电机无速度传感器直接转矩控制系统的可行性以及对参数误差的鲁棒性。