无刷双馈风力发电系统的转速自抗扰控制

针对变速、恒频风力发电系统具有非线性、强耦合的特点，结合无刷双馈电机的结构特点及基本理论，导出其在发电状态下的转子速由轴电压、电流方程式，并以此为基础构建了无刷双馈发电机（brushlessdoubly—fedgenerator，BDFG）在双同步坐标系下的数学模型。对控制绕组子系统对应的转子磁链进行观测，引入自抗扰控制（active—disturbancerejectioncontrol，ADRC）策略实现转速解耦控制，使发电机转速跟踪风速变化，获得最佳叶尖速比；调节控制绕组频率，在低风速下可达到最大风能跟踪控制和变速恒频发电的目的。仿真结果表明：磁链观测器能较准确估计控制绕组子系统对应的转子磁链，ADRC受系统参数变化的影响较小，具有较强的鲁棒性和适应性，改善了系统的控制品质，验证了控制策略的可行性。

Automatic Disturbance Rejection Control over Rotating Speed of Brushless Doubly-fed Wind Generator System

Aiming at nonlinearity and close coupling of variable speed generator and frequency constant generator system,the paper,in combination with structural characteristics and basic principles of brushless doubly-fed generator,derives voltage and current equation at axis dq of stator rotating speed in generating state,on the basis of which it establishes mathematic model of brushless doubly-fed generator(BDFG) in double synchronous coordinate system.By observing rotator flux corresponding to winding control subsystem,the paper introduces active-disturbance rejection control(ADRC) for implementation of rotating speed decoupling control to enable rotating speed of generator to follow wind speed and obtain speed ratio of blade tip;it adjusts winding control frequency to achieve tracking control over maximum wind energy and speed-varied frequency-constant power generation.The simulation result shows that rotator flux observer can accurately evaluate rotator flux corresponding to winding control subsystem;ADRC can be scarcely influenced by parameter change of the system and it is of greater robustness and adaptability,improving control quality of the system and verifying feasibility of control strategy.