基于MRAS无速度传感器的永磁同步电机转速跟踪控制

Speed Tracking Control of Permanent Magnet Synchronous Motor Based on MRAS Sensorless Speed Sensor

为了提高永磁同步电机在直接转矩控制过程中磁链和转速的观测精度,降低控制系统对电机参数的依赖性,提出了一种基于模型参考自适应(MRAS)的直接转矩控制方法。首先针对磁链估计提出了一种转子位置和定子电流的新型磁链估计方法,该方法受速度影响小,调速范围广。采用基于转矩和磁链两个PI调节器,对电机空间电压矢量中转矩和磁链两个分量进行解耦从而构造出控制方法。为了获得转子的位置,提高这个系统的稳定性,在新型磁链估计方法的基础上提出了基于MRAS的无速度传感器的电机转速辨识方法。实验结果表明,本文所提方法能够有效提高整个控制系统的动态响应性和稳定性。

In order to improve the PMSM in the direct torque control the observation accuracy of flux in the process, the control system is reduced the dependence on motor parameters, put forward a kind of control method of direct torque control based on model reference adaptive system(MRAS). First for the estimation of the flux presents a novel rotor position and stator current flux estimation method, the method by affecting the speed of small, speed range wide. Use based on the torque and flux linkage of two PI regulator, decoupling to construct control method of motor voltage space vector torque and flux linkage of two components. In order to obtain the rotor position and improve the stability of the system, the new flux estimation method based on the non speed sensor motor speed identification method based on MRAS. Experimental results show that the proposed method can effectively improve the dynamic response and stability of the whole control system.