双馈风力发电机组等效模型对机组暂态稳定性影响

为研究并网双馈风力发电机组的机电耦合作用对机组暂态性能的影响,采用等效集中质量法,在Mat-lab/Simulink环境下,提出一种基于叶片弯曲柔性和传动轴扭转柔性的风力发电机组3质量块等效模型。结合双馈发电机控制策略,分别以额定功率750 kW和3 MW的风力发电机组为例,对其在电网电压跌落和机械扰动两种情况下进行暂态稳定性仿真,并将仿真结果和传统的1质量块、2质量块等效模型的仿真结果进行比较分析。结果表明:随着单机容量的增加,叶片的柔性对机组暂态稳定性的影响逐渐增大,建立3质量块等效模型对研究大容量双馈风力发电机组暂态稳定性是必要和有效的。

Influence of equivalent models on transient performances of a wind turbine with DFIG

In order to analyze the influences of the mechanical-electrical decoupling on transient performances for a grid connected wind turbine doubly fed induction generator(DFIG) system,a three-mass equivalent model of wind turbine is presented considering both the bending flexibility of blades and the torsional flexibility of the drive-train shaft,by using equivalent lumped mass method based on Matlab/Simulink.Combined with the power control strategy of DFIG,the transient stability of the wind turbine systems with rated power of 750 kW and 3 MW are investigated,during a grid voltage drop and a mechanical disturbance.Comparing with those of the typical one-mass and two-mass equivalent models of wind turbines,the simulation results show that the proposed three-mass equivalent model of wind turbine is essential and valid to analyze the transient stability of large capacity of wind turbine systems,because the influences of blade flexibility on the transient stability rise along with the increase of the single capacity of wind turbine systems.