基于MRAS参数辨识的PMSM无速度传感器控制

Sensorless Control of PMSM Based on Parameter Identification MRAS

研究了在无速度传感器控制条件下,基于MRAS的永磁同步电机参数辨识系统。针对目前多参数在线辨识遇到的欠秩问题,提出了一种固定部分参数分两步估计电机转速、定子电阻和永磁体磁链的辨识方法,分别推导了同时辨识的参数自适应律,确保参数估计收敛性和唯一性。仿真结果表明:该控制系统在负载突变下能准确跟踪转子的速度,具有良好的鲁棒性和动、静态性能,同时降低了参数敏感性。

The parameter identification system of permanent magnet synchronous motor based on MRAS under the condition of speed sensorless control was studied. In order to address the problem of deficient-rank in multi- parameter on-line identification. A two-step method that fixes part of the parameters to estimates motor speed, stator resistance and permanent magnet flux was proposed. The parameter adaptive laws were derived respectively in order to ensure the convergence and uniqueness of the parameter estimation. The simulation results showed that the control system could accurately track the speed of the rotor under the load transient change, and has good robustness, with reduced sensitivity on the parameters.