双馈式风力发电系统的运行控制与建模仿真

Operation control and modeling-simulation of doubly-fed wind power generation systems

建立包含风速、风力机、风力机机械控制部分、双馈发电机及发电机电气控制部分的双馈式风力发电系统模型。基于最佳叶尖速比(即最大风能利用率),给出速度和桨距角控制器的控制策略。采用定子磁链定向的矢量控制技术,对双馈发电机转子进行交流励磁控制,实现发电机有功、无功功率的解耦控制。对风力发电系统的空载并网及低风速下的发电运行进行仿真,验证了双馈式风力发电系统建模和控制的正确性与有效性。

A whole model for a doubly-fed wind power generation system （DFWPGS） was presented and the model included wind speeed, wind turbines and mechanical control, doubly-fed generators and electrical control of generators. Based on optimum tip speed ratio of the rotor blade tip speed to wind speed （also maximum performance coefficient of the turbine）, speed control and blade pitch angle control strategy were given. The paper introduced the vector control technique oriented by the stator flux of the generator, which was used to provide AC excitation for doubly-fed generators, and decoupling control of the active and reactive power was implemented. The simulation was done under the condihons of no load, integrating with the electric network, and wind power generation at low wind speed. The results vertify that the modeling and control of DFWPGS are correct and effective.