带自调整因子的双馈风力发电空载并网模糊控制

摘要

Doubly-fed wind power generation requires a safe and fast grid cutting-in,yet the traditional PID control depends much on the precise mathematical model of the doubly-fed induction generator (DFIG).In this study,the fuzzy PID controller is applied to the no-load cutting-in control of the DFIG.In the start and steady stages of no-load cutting-in,there is voltage deviation between the stator and the grid,which holds different re-quirements for the controller.To meet the requirements,this paper proposes a kind of fuzzy PID controller with the self-tuning factor.It can automatically distribute the different tuning factors according to voltage deviation,so as to realize the self-tuning of fuzzy control domain according to the input signal.The proposed control strategy is verified on a 10 kW DFIG experimental platform.The controller with the self-tuning factor can make the stator voltage track the grid voltage quickly and accurately compared with the conventional fuzzy controller,thus,the transition process of no-load cutting-in is short,and the impact current of the stator is small.%双馈风力发电要求机组安全平稳快速实现并网过程,传统的 PID控制依赖于双馈电机精确数学模型,将模糊PID控制器应用于双馈电机的空载并网过程中.针对并网起始及稳态阶段定子与电网不同电压差对控制器的不同要求,提出了带自调整因子的空载并网模糊 PID控制器,该控制器能根据电压偏差大小自动分配不同的调整因子,使模糊论域随着输入信号的变化而变化.所提策略在10 kW双馈风力发电模拟平台上进行了实验验证,通过与常规的模糊控制空载并网实验结果相比较,带自调整因子控制器能使定子电压快速、准确的跟踪电网电压,并网过渡过程短暂,定子电流冲击小.