基于自适应滑模观测器的无传感器PMSM系统设计  

Design of Sensorless PMSM System Based on Self-adaptive Sliding Mode Observer

作　　者：周玉莹 罗静 戴鑫 曾云峰 黄鑫 Zhou Yuying;Luo Jing;Dai Xin;Zeng Yunfeng;Huang Xin(School of Electronic and Information Engineering,Jingchu Institute of Technology,Jingmen,Hubei 448000,China;School of Electrical Engineering,Changjiang University,Jingzhou,Hubei 434023,China)

机构地区：[1]荆楚理工学院电子信息工程学院,湖北荆门448000 [2]长江大学电气工程学院,湖北荆州434023

出　　处：《机电工程技术》2024年第7期163-166,共4页Mechanical & Electrical Engineering Technology

基　　金：荆门市科技计划项目(2022YFYB011);荆楚理工学院校级科研项目(YY202101);大学生科技创新项目(S202311336002)。

摘　　要：为解决传统自适应滑模观测器存在跟踪精度较低、抖振较大等问题,在传统滑膜观测器的基础上,提出了一种改进的幂指数趋近律,使系统更加平稳地趋近滑模面,并证明了该趋近律的存在性、合理性。首先,建立了永磁同步电机的数学模型;其次,根据电流的状态方程和滑模的等效控制理论,估计出PMSM在两相静止坐标系下的反电动势,并由此得到在传统滑模观测器转子位置;再次,基于改进的幂指数趋近律,设计了新的转子位置观测器,并利用Lyapunov稳定性理论证明了观测器的稳定性;最后,在MATLAB平台上进行了仿真,以幂指数趋近律构建转子位置,搭建Simulink仿真模型,将传统滑模趋近律与幂指数趋近律进行了对比分析,结果表明,改进的幂指数观测器能够有效地降低转子位置跟踪过程中的抖振,并提高跟踪精度。To address the issues of low tracking accuracy and significant vibration in traditional adaptive sliding-mode observers,an improved power-exponential convergence law is proposed based on the traditional sliding-mode observer.The law helps the system approach the sliding surface more smoothly,and the existence and rationality of this convergence law are proven.Firstly,the mathematical model of the permanent magnet synchronous motor(PMSM) is established.Secondly,based on the state equations of current and the equivalent control theory of sliding mode,the back electromotive force of PMSM in the two-phase stationary coordinate system is estimated,from which the rotor position is obtained in the traditional sliding-mode observer.Thirdly,using the improved power-exponential convergence law,a new rotor position observer is designed,and the stability of the observer is proved using Lyapunov stability theory.Finally,simulations are conducted in the MATLAB platform to construct rotor position and velocity observers using the power-exponential convergence law.A Simulink simulation model is built to compare the traditional sliding-mode convergence law with the improved power-exponential convergence law.The results show that the improved power-exponential observer can effectively reduce vibration during rotor position tracking and enhance tracking accuracy.

关 键 词：滑模观测器 永磁同步电机 趋近律 

分 类 号：TM351[电气工程—电机]