IF控制结合滑模观测器的永磁同步电机无位置传感器复合控制策略

摘要

用于永磁同步电机低速区的高频信号注入无位置传感器控制算法会产生额外的损耗,而且算法数字运算量较大.针对这一问题,提出一种IF控制结合滑模观测器的永磁同步电机无位置传感器复合控制策略.在电机低速区采用转速开环、电流闭环的 IF控制策略,对 IF控制使用的虚拟同步坐标系和转子同步坐标系相位关系进行分析.在电机中高速区采用基于滑模观测器的无位置传感器控制策略,在滑模观测器中采用正弦型切换函数,改善了滑模运动的抖振问题.通过合理设计过渡状态,实现了两种控制策略的平滑切换.在一台三相永磁同步电机上对所提复合控制策略进行了实验验证.%The high frequency signal injection method for position-sensorless control of permanent magnet synchronous motor (PMSM) in low speed region will produce extra power loss. Moreover, this method is computationally intensive. Therefore, this paper proposes a hybrid position-sensorless control scheme for PMSM based on combination of IF control and sliding mode observer. In low speed region, IF control with open speed loop and closed current loop is used. The phase relationship between virtual synchronous frame and rotor synchronous frame is analyzed. In high speed region, sliding mode observer (SMO) is used to achieve position-sensorless control. Sinusoidal function is adopted to decrease the chatter in SMO. The smooth transition of the two control schemes is achieved by designing a proper transition status. This hybrid control scheme is verified by experiment results on a three-phase PMSM.