基于新型趋近律的PMSM反演滑模控制

PMSM inverse sliding mode control based on new reaching law

在永磁同步电机(PMSM)矢量控制系统中,针对传统的PI控制器控制精度不足、超调量大、易受外界扰动影响的问题,本文提出了一种反演滑模控制器替换传统的PI控制器,该反演滑模控制器是由反演法与滑模控制理论相结合产生的,且在趋近律设计方面引入双曲正切函数和系统状态变量,从而形成一种新型趋近律,代替传统的指数趋近律,提高系统的收敛速度,减小滑模抖振现象。在MATLAB/Simulink中搭建仿真模型,仿真结果表明,该方法使系统对电机的转速有着良好的控制效果,与PI控制、传统滑模控制以及变指数滑模控制相比较,具有较好的动态响应性能,转速超调量分别减少了22.15%、18%和2.75%,系统抗扰动能力提高,具有较强的稳定性。

In the vector control system of permanent magnet synchronous motor(PMSM), aiming at the problems of insufficient control accuracy, large overshoot and easy to be affected by external disturbance of the traditional PI controller, an inverse sliding mode controller is proposed to replace the traditional PI controller. The inverse sliding mode controller is produced by the combination of inversion method and sliding mode control theory, In the design of reaching law, hyperbolic tangent function and system state variables are introduced to form a new reaching law, which replaces the traditional exponential reaching law, improves the convergence speed of the system and reduces the chattering phenomenon of sliding mode. The simulation model is built in MATLAB/Simulink. The simulation results show that this method makes the system have a good control effect on the motor speed. Compared with PI control, traditional sliding mode control and variable exponential sliding mode control, it has better dynamic response performance, the overshoot is reduced by 22.15%, 18% and 2.75% respectively. The anti-disturbance ability of the system is improved and the system has strong stability.