基于模糊时变滑模的永磁同步电机调速系统设计

Design of Permanent Magnet Synchronous Motor Speed Control System Based on Fuzzy Time-varying Sliding Mode

针对永磁同步电机突然加入负载时存在的转速波动和不稳定问题,提出一种基于积分时变滑模面和新型模糊增益趋近律的滑模调速方法。采用积分时变滑模面,在传统积分滑模面中加入一个时变项,借此提升系统的响应速度。改进传统的指数趋近律,加入非线性函数来削弱系统的抖振,同时根据不同的系统状态用模糊算法整定趋近律增益参数,着重于提升趋近速度和系统抗扰动能力。最后,使用李雅普诺夫稳定性判据证明了该控制系统的稳定性。在MATLAB/Simulink环境下将此控制策略与传统滑模控制策略进行对比,仿真结果表明:采用此控制方法的系统响应速度更快、抑制系统扰动和抖振的能力更强,具备更好的综合性能。

Aiming at the problem of speed fluctuation and instability when the permanent magnet synchronous motor(PMSM)is suddenly loaded,a sliding mode speed regulation method based on integral time-varying sliding mode surface and a new fuzzy gain reaching law was proposed.A time-varying term was added to the traditional integral sliding mode surface by using the integral time-varying sliding mode surface to improve the response speed of the system.The traditional exponential approach law was improved by adding nonlinear functions to weaken the chattering of the system.At the same time,fuzzy algorithm was used to adjust the gain parameters of the approach law according to different system states,focusing on improving the approach speed and anti-disturbance ability of the system.Finally,Lyapunov stability criterion was used to prove the stability of the control system.The proposed control strategy was compared with the traditional sliding mode control strategy in MATLAB/Simulink environment.The simulation results show that the proposed control method has faster response speed,stronger ability to suppress system disturbance and chattering,and better comprehensive performance.