永磁同步电机新型滑模观测器无传感器控制

Sensorless Control for New Sliding Mode Observersof Permanent Magnet Synchronous Motors

为了减少永磁同步电机(permanent magnet synchronous motor,PMSM)滑模观测器(sliding mode observer,SMO)无传感器控制策略的高频抖振,提出了一种基于模型参考自适应滑模观测器无传感器控制方法。通过扩展滑模观测器得到静止坐标系下的反电动势估计值,运用模型参考自适应的方法建立速度观测器获得转速估计值和新的反电动势,并将反电动势带入到改进型锁相环(phase-locked loop,PLL)中处理获取位置角。仿真和试验结果表明,与相比传统SMO的锁相环位置估算方法,显著减小滑模抖振分量,提高系统动态性能。

In order to reduce high-frequency buffeting of the sensorless control strategy of the sliding mode observer(SMO)of the permanent magnet synchronous motor(PMSM),a sensorless SMO control method was proposed on the basis of model reference adaptive sliding mode observer.According to this method,an estimated counter electromotive force in the static coordinate system was obtained by extending the SMO.Then,a speed observer was constructed in the model reference adaptive method to obtain an estimated rotational speed and a new counter electromotive force.Furthermore,the counter electromotive force was brought into the improved phased-locked loop(PLL)to obtain the position angel.Simulation and test results showed that,compared with conventional SMO PLL position estimation,the buffeting component of the sliding mode was reduced significantly and the dynamic performance of the system was improved.