基于自抗扰控制器的变速恒频风力发电并网控制

Cutting-in Control of the VSCF Wind-power Generator Based on Auto-disturbance Rejection Controller

通过分析交流励磁变速恒频风力发电机组运行特点,将矢量控制技术与自抗扰控制器(ADRC)结合起来应用于双馈发电机空载并网控制上,得到了一种新型并网控制策略。该控制方案不需要精确电机参数就可以实现并网,控制器的设计也不需要建立精确的数学模型。自抗扰控制器利用其内部的扩张状态观测器可以估计出系统的内外扰动,通过前馈补偿的方法可将系统模型等效为确定性的积分串联型对象。控制系统包括两个采用ADRC的电流控制器和一个基于“微分检测”的电压控制器。仿真表明控制器对电机模型的不确定性和外部扰动变化具有较强的鲁棒性,并网控制系统具有优良的动态性能。

By analyzing the operation behavior of an A.C. excited variable-speed constant-frequency（VSCF） wind-power generator, the field-oriented vector control technique and the auto-disturbance rejection controller（ADRC） were transplanted into the cutting-in control of the doubly-fed induction generator with no-load and a novel cutting-in control strategy was obtained. The strategy can realize cutting-in without accurate parameters of doubly-fed induction generator（DFIG） and the controller can be designed without accurate DFIG model. Extended Slates Observer（ESO） in ADRC can calculate the value of disturbance on line, and by compensating the disturbance the system model can be transformed into a certain series-connection integral object. The control system consists of two current controllers using ADRC and one voltage controller based on differential coefficient detection. The simulation results show that the controllers ensure very good robustness and adaptability under modeling uncertainty and external disturbance, and produce good dynamic performance.