基于位置观测的直驱系统无速度传感器技术

针对兆瓦级永磁同步直驱系统中电机的特点,采用一种基于状态观测器和锁相环模型相结合的无速度传感器控制技术。该技术通过电机数学模型,建立定子电流的状态方程,并构建基于定子电流状态方程的观测器模型;运用锁相环原理,在假定旋转坐标系下对观测器模型的输出建立速度和位置估计的闭环控制器。采用此技术构建了应用于直驱系统的永磁同步电机矢量控制方案。通过仿真验证了所述方案的可行性,并通过实验室样机平台,验证其在全速范围内位置和转速估计的正确性。

A Sensorless Control Method for Direct Driven Wind Turbines Based on Position Observation

Given the characteristics of the MW level permanent magnetic synchronous generator (PMSG),a sensorless control method is proposed by use of the state observation technology and phase-locked loop (PLL) model. Based on the mathematical model of PMSG,the state equations of stator current are derived and an observer model is established. Based on the PLL technology,a close loop controller for the speed and position estimation using the outputs of the observer is established in a presumed rotating coordinate system. A vector control scheme is then proposed. Simulation results indicate the feasibility of the method. Experiments on a lab prototype platform also validate the correctness of the position and speed estimation.