基于有限位置集锁相环的永磁风力发电机转子位置估计方法

Rotor position estimation method of permanent magnet wind generator based on finite position set-phase locked loop

针对风速突变时,同步参考系锁相环(SRF-PLL)估计永磁同步发电机(PMSG)转子位置存在响应速度慢及跟踪精度低的问题,提出一种基于有限位置集锁相环(FPS-PLL)的转子位置估计方法。将某一时刻的转子位置离散出多个位置信息,结合滑模观测器和设计的反电动势代价函数计算评估反电动势准确提取实际转子位置。该方法省略SRF-PLL的PI整定过程,并增强了抗风速突变的系统扰动能力。仿真和实验结果表明:在风速突变下能够快速跟踪转子位置和转速信息,转速跟踪整定时间减少42 ms,位置误差在0.03 rad以下,具有良好的动静态性能及更高的估计精度。

Considering the problems of slow response speed and low tracking accuracy caused by the synchronous reference frame phase-locked loop(SRF-PLL)under the sudden change of wind speed,a novel rotor position estimation approach was presented based on the finite position set phase-locked loop(FPS-PLL)for the estimation of PMSG rotor position method.The rotor position at a certain time was discretized into multiple position information.Meanwhile,the actual rotor position was accurately extracted by combining the sliding mode observer and the designed back EMF cost function.This novel approach eliminates the process of a fixed-gain proportional-integral(PI)setting which is commonly utilized in the SRF-PLL,and enhances the anti-disturbance ability of the system.The simulation and experimental results show that the novel approach can quickly track the rotor position and the speed information under a sudden change of the wind speed.It also shows that the setting time is reduced by 42 ms,and the position error was less than 0.03 rad.Hence,this verifies a better static and dynamic performance,as well as a higher estimation accuracy of the proposed control strategy.