变速恒频DFIG的fal函数积分滑模控制

摘要

双馈发电机有功、无功功率的解耦控制是变速恒频双馈风力发电系统的关键技术.首先对双馈异步发电机的动态数学模型以及基于定子磁场定向的矢量控制方案进行了分析,进而针对传统矢量控制在双馈风力发电机功率解耦过程中的动态性能不佳现象,提出基于积分滑模变结构控制方案,并将幂次函数引入积分滑模控制中,构建了基于幂次函数的积分滑模控制器,实现了双馈风力发电机有功、无功功率的解耦及风能最大追踪.仿真实验表明与传统PI控制器相比,该控制策略具有优良的动、静态性能和控制精度.%Decoupling control of active power and reactive power of doubly fed induction generators (DFIG) is a key technology of variable-speed constant-frequency doubly-fed wind power generation system.In this study,the dynamic mathematical model of the doubly-fed asynchronous generator was firstly analyzed,and the vector control scheme was also analyzed based on the stator field orientation.In order to cope with the poor dynamic performance of traditional vector control in decoupling of DFIG power,a scheme based on integral sliding mode variable structure control was proposed and the power function was introduced into integral sliding mode control to construct an integral sliding mode controller based on the power function.The decoupling of active power and reactive power of DFIG,and the maximum wind power tracking were finally realized.The simulation results show that this control strategy,compared with the traditional PI controller,exhibits better dynamic and static performance,and control precision.