双馈电机无速度传感器控制算法研究

Research on Speed Sensorless Control Strategy of Doubly Fed Induction Generator Under Asymmetry Grid

为解决电网不对称条件下,双馈电机转速、转子位置估算不准确问题,从而解决无速度控制算法无法工程化应用问题,提出一种基于比例积分谐振(PIR)闭环控制器的自适应控制器的无速度传感器控制算法。分析了速度估算原理与实现方法及无速度传感器控制策略研究。搭建2 MW的双馈异发步电机(DFIG)背靠背及电网跌落装置试验台,验证了在电网对称、不对称条件下,估算转子位置在不同转速和功率下都能准确跟踪实际值,确保有功、无功解耦的准确控制,证明了所提方案的可行性。并成功应用到商业化风机上,在风力发电场也得到验证。

In order to solve the problem of inaccurate estimation of speed and rotor position of doubly-fed machines under asymmetric grid condition, an adaptive control scheme based on proportional-integral-resonance（PIR）closed-loop controller is proposed.Controllerless speed sensorless control algorithm.The speed estimation principle and implemen- tation method and speed sensorless control strategy are analyzed.The experimental results show that the rotor position can accurately track the actual value under the symmetrical and asymmetrical conditions of the grid, and ensure the active and reactive power solutions of the doubly-fed induction generator （DFIG） back-to-back and grid-drop testfig. The feasibility of the proposed scheme is proved by the accurate control of the coupling.And successfully applied to the commercial fan, the wind farm has also been verified.