基于内模原理的双馈发电机功率解耦控制

The Decoupling Control of Power of Doubly-fed Induction Generator Based on the Internal Model Control Theory

双馈发电机有功、无功功率解耦控制是变速恒频风力发电系统的关键技术。在分析双馈发电机有功、无功功率解耦控制规律的基础上,对双馈发电机的交叉耦合电势采用内模控制解耦方案,使系统具有良好的输出动态性能。为了在设计的内模控制器中实现磁链和参数估计,采用一种基于模型参考方法的自适应定子磁链观测器,应用 Lyapunov 原理证明了电流估计误差的收敛性,使其估计值准确地跟踪其实际值。仿真结果表明,该方法实现了发电机有功功率和无功功率的充分解耦,提高了控制系统的准确性和鲁棒性。

The decoupling of the active and reactive power of a doubly-fed induction generator （DFIG） is the key technology in the variable speed constant frequency wind turbine generator system. A configuration for decoupling active and reactive power in DFIG is put forward, which uses an Internal Model Controller for voltage and current for eliminating the cross coupling potential. To estimate and realize the flux and parameters in this scheme, an adaptive stor flux observer based on model reference method is adopted, and the convergence of the estimation error is proved by Lyapanov theory. Results of simulation show that this method can efficiently decouple the active and reactive power of the DFIG. The accuracy and robustness of control system are also improved.