一种基于积分滑模观测器的永磁同步电机磁链重构方法

PMSM Flux Reconstruction Method Based on Integral Sliding Mode Observers

针对永磁同步电机转子永磁体的失磁故障问题,提出了一种基于积分滑模观测器的磁链重构方法。首先,建立d-q轴坐标系下永磁同步电机失磁故障时的电流状态方程;其次,结合滑模观测器和比例积分观测器的特点构建了积分滑模观测器,实现了对永磁同步电机磁链信息的在线检测重构;最后,基于Lyapunov 稳定性理论,证明了积分滑模观测器的稳定性,并依据滑模等值控制原理重构了永磁体磁链算式。仿真结果表明,所设计的积分滑模观测器对磁链的观测精度较高,且具有较好的鲁棒性和快速性。

In view of the demagnetization fault of the permanent magnets of the permanent magnet synchronous motor(PMSM)rotor,a flux reconstruction method has thus been proposed based on the integral sliding mode observer.Firstly,the current state equation is established of the permanent magnet synchronous motor during demagnetization fault in the d-q axis coordinate system.Secondly,an integral sliding mode observer is constructed with the characteristics of the sliding mode observer and the proportional integral observer combined together,thus realizing the on-line detection and reconstruction of flux linkage information of the permanent magnet synchronous motor(PMSM).Finally,the stability of the integral sliding mode observer is verified based on Lyapunov stability theory,with the permanent magnetic flux linkage reconstructed according to the sliding mode equivalent control principle.The simulation results show that the designed integral sliding mode observer is characterized with a high observation accuracy for flux linkage,greatly improved in its robustness and rapidity.