自适应高阶滑模永磁同步电机永磁磁链观测

Permanent magnet flux linkage observation for PMSM basedon adaptive high-order sliding mode

针对永磁同步电机(PMSM)用传统方法难以准确观测永磁体的失磁问题,讨论基于自适应非奇异终端滑模变结构的永磁磁链观测策略。依据永磁体失磁工况建立永磁同步电机数学模型,根据永磁同步电机失磁故障检测,构建自适应和非奇异终端滑模观测器,给出定子电阻自适应估计值,借助Lyapunov稳定性理论对观测器的稳定性加以证明,依据滑模变结构等值控制原理构造出永磁磁链算式。仿真实验验证了在改变定子电阻参数后,自适应高阶滑模永磁磁链观测器能准确地检测磁链参数。

With regard to the problem that the traditional methods are difficult to precisely detect the demagnetization of permanent magnet synchronous motor(PMSM), an adaptive nonsingular terminal-sliding-mode control algorithm is discussed for PMSM. Firstly, the mathematical model of PMSM is established according to permanent magnet demagnetization condition. Then, adaptive observer and nonsingular terminal-sliding-mode observer(NTSMO) is constructed for permanent magnet demagnetization detection and the adaptive estimation of stator resistance is given. The stability of the sliding mode observer is proved by the Lyapunov stability theory. Based on the equivalent control principle of sliding mode variable structure, equation for permanent magnet flux linkage is constructed. Finally, it is verified by simulation experiments that after changing the stator resistance parameter, the adaptive high-order sliding mode permanent flux observer can detect the flux parameters accurately.