基于多参数辨识MRAS的三相PMSM无传感器控制系统研究

Research on Three Phase PMSM Sensorless Control System Based on Multi-parameter Identification MRAS

针对永磁同步电机在线辨识存在变参数、相互耦合、方程欠秩问题。提出一种基于Popov超稳定性理论的多参数辨识方法,首先确定交直轴电感和转子磁链参数,去辨识定子电阻和电角速度,待定子电阻稳定后,再辨识转子磁链,这样解决了转子磁链在起始时不稳定难以辨识的问题,大大提高了辨识的精度。最后待转子磁链稳定后,去辨识交直轴电感。结果表明,此设计方法提高了系统的快速性,增强了系统跟踪精度。

For the permanent magnet synchronous motor on-line identification,there are problems of variable parameters,mutual coupling,and equation under-rank.This paper proposes a multi-parameter identification method based on Popov's superstability theory.First,determine the inductance of the quadrature-direction axis and the rotor flux linkage parameters to identify the stator resistance and electrical angular velocity.After the stator resistance is stabilized,identify the rotor flux linkage.The problem that the rotor flux is unstable and difficult to identify at the beginning has greatly improved the accuracy of identification.Finally,after the rotor flux is stable,identify the inductance of the quadrature-direction axis.The simulation results show that the design method improves the speed of the system and enhances the tracking accuracy of the system.