基于滑模观测器与分数阶锁相环的无传感器PMSM矢量控制

摘要

提出一种基于滑模观测器与分数阶锁相环(FO-PLL)的无传感器永磁同步电机(permanent magnet synchronous motor,PMSM)矢量控制算法.首先用滑模观测器估计出反电势,然后设计FO-PLL对转子位置和速度进行估计.切换函数采用饱和函数代替开关函数,有效地削弱了滑模观测器存在的抖振.所提出的FO-PLL包含一个可调的分数阶次r,因此与传统锁相环(PLL)相比,该FO-PLL具有一个额外的自由度,传统PLL也可以看成是FO-PLL的一个特例.通过选择合适的分数阶次r,能够获得更好的转子位置和速度观测性能.仿真结果证明了所提方法的有效性.%A sliding mode observer and fractional-order phase-locked loop(FO-PLL)method is proposed for the sensorless speed control of a permanent magnet synchronous motor(PMSM).The saturation function is adopted in order to reduce the chattering phenomenon caused by the sliding mode observer.In this proposed FO-PLL method,a regulable fractional order r is involved,which means that the FO-PLL provides an extra degree of freedom.In fact,the conventional phase-locked loop(PLL)applied in sensorless PMSM control can be seen as a special case of the proposed FO-PLL.By selecting a proper fractional order r a better performance may be achieved.The computer simulation results demonstrate the effectiveness of the proposed method.