改进指数趋近率的PMSM矢量控制研究

Research on PMSM space vector control based on sliding mode velocity controller

永磁同步电机(permanent magnet synchronous motor, PMSM)为具有强耦合特点的非线性系统。传统矢量控制方法存在转速超调量大、抗扰动性能较差的问题。基于PMSM的数学模型,对比了现今常用的几种滑模控制器的特点,通过改进一般指数趋近率得到新型指数趋近率的滑模控制器模型,数学推导证明其稳定性并在Matlab/Simulink环境中搭建仿真模型。与一般的指数趋近率相比,改进的指数趋近率滑模控制器控制永磁同步电机具有超调量小、转速响应快的特点,并且能很好地抑制外界干扰,验证了结论的正确性。

Permanent magnet synchronous motor(PMSM)is a nonlinear system with strong coupling characteristics.The traditional vector control method has the problems of large speed overshoot and poor anti-disturbance performance.Based on the mathematical model of PMSM, the characteristics of several commonly used sliding mode controllers are compared.By improving the general exponential reaching law, the sliding mode controller model of the new exponential reaching law is obtained.The mathematical derivation proves its stability and the simulation model is built in Matlab/Simulink environment.Compared with the general exponential reaching rate, the improved exponential reaching rate sliding mode controller for permanent magnet synchronous motor has the characteristics of small overshoot and fast speed response, and can well suppress external interference, which verifies the correctness of the conclusion.