基于滑模观测器与SPLL的PMSG无传感器控制

Sensorless control of PMSG based on sliding mode observer and software phase locked-loop

实现永磁同步发电机矢量控制的前提在于电机转速与转子位置信息的准确获取。为此,提出一种基于滑模观测器与软件锁相环的无传感器方法,该方法直接在转子同步旋转d-q坐标系中采用滑模观测器估计电机感应电动势,再将估计出的感应电动势作为软件锁相环输入进行转速与转子位置的估计。分析、推导出了感应电动势滑模观测器与软件锁相环的数学模型,通过仿真测试了该法在模型参数与电机实际参数相差较大的情况下,对电机多种工况的估计效果,并将其用于某永磁直驱风力发电系统中。结果表明该方法对电机参数变化与外部扰动有很强的鲁棒性,跟踪转速与转子位置准确,且算法简单,易于数字系统实现。

The premise of realizing the vector-control of permanent magnet synchronous generator（PMSG） lies in obtaining the accurate information about angular speed and rotor position.This paper put forward to a sensorless control of PMSG based on sliding mode observer and software phase locked-loop（SPLL） which estimates the internal voltage in the rotor-oriented dq-reference frame by using sliding mode observer.SPLL used the internal voltage estimated to estimate angular speed and rotor position.Under the condition that there was much difference between model parameter and actual parameter,through simulation it tested the estimating result of various operating modes by using the method and applied the method to PMSG of directly driven wind turbine.The result indicates that it is robust to parameter variation and exterior interfere,and could accurately estimate rotate speed and rotor position.