变桨距型双馈风电机组并网控制及建模仿真

变桨距型双馈风电机组在并网过程中，转子励磁控制虽然具有良好的定子电压调节效果，但是对转子转速缺乏控制。针对该问题提出了结合变桨距系统调整转子转速，共同完成并网的方案。由于双馈发电机并网前后的控制策略不同，分析了控制系统间无扰切换的方法。采用分开建模、分时仿真的思路建立了风电机组模型，实现了风机并网全过程仿真，研究结果证明了本文所提方案的有效性。

Cutting-in Control of Variable-Pitch Doubly-Fed Wind Power Generation System and Its Modeling and Simulation

In the cutting-in process of variable-pitch doubly-fed wind power generator sets, the stator voltage can be adjusted by AC excitation control system of rotor in a certain range of rotor rotational speed, however the rotational speed of rotor itself is not controlled. For this reason, a cutting-in strategy combined with variable-pitch control to regulate rotor speed is proposed. Because the control strategies of doubly-fed induction generation set before and after connecting it with power grid are different, the approach for switching over of control systems without disturbance is anlayzed. By using the idea of respective modeling and time sharing simulation, the model of variable-pitch doubly-fed wind power generator is established, and the whole cutting-in process simulation of variable-pitch doubly-fed wind power generator is implmented. The effectiveness of the proposed cutting-in strategy is validated by simulation results.