基于分数阶滑模自适应观测器的永磁电机转速估计策略研究

Study on Speed Estimation Algorithm for Permanent Magnet Synchronous Motor Based on Fractional Sliding Mode

针对永磁同步电机模型参考自适应系统转速估计的动态性能和鲁棒性,提出了一种基于分数阶滑模的模型参考自适应观测器的转速估计策略。首先针对传统MRAS误差收敛速度慢的问题,在系统中加入反馈校正环节;其次为增加系统鲁棒性、防止系统抖振,采用二阶滑模中的分数阶滑模代替传统MRAS中的PI结构;最后采用MATLAB/Simulink软件验证了所提方法的有效性,发现基于分数阶滑模的观测器在鲁棒性和动态性能上都有所提高。

Aiming at the dynamic performance and robustness of speed estimation of PMSM model reference adaptive system,a speed estimation strategy based on fractional sliding mode model reference adaptive observer was proposed in this paper.Firstly,to solve the problem of slow error convergence of traditional MRAS,a feedback correction link was added into the system.Secondly,in order to increase the robustness of the system and prevent chattering,the PI structure in traditional MRAS was replaced by fractional sliding mode of second order.Finally,MATLAB/Simulink software was used to verify the effectiveness of the proposed method,and it was found that the robustness and dynamic performance of the observer based on fractional sliding mode were improved.