中文摘要：

为了有效减少变速恒频双馈风电机组额定风速以上时的功率和转速波动,提出了一种同时考虑桨距角和双馈感应发电机转子励磁电压调节的新型恒功率控制策略。在分析风力机特性和双馈感应发电机基本电磁关系的基础上,建立了变速恒频双馈风电机组的非线性数学模型,并利用反馈线性化理论设计了非线性控制器。仿真结果表明,所提出的控制策略与现存的仅考虑桨距角或电磁转矩调节的恒功率控制策略相比,具有更好的功率调节特性。

英文摘要：

A new power regulation strategy for the variable-speed constant-frequency wind turbine driven doubly-fed induction generator（DFIG） system is studied with simultaneous pitch angle and excitation voltage control.The primary objective of the control strategy is to reduce electrical power and rotor speed fluctuations above the rated wind speed.Based on the wind turbine＇s characteristics and basic electromagnetic relationship of DFIG,a nonlinear mathematic model of the variable speed constant frequency wind turbine driven DFIG is established.The feedback linearization theory is used to design a nonlinear controller.Compared with existing strategies which only consider the pitch angle or electromagnet torque regulation,the proposed approach achieves better power regulation.