考虑风电机组稳定性的DFIG机组无功功率极限

Reactive power limit of double fed induction generator considering the small signal stability

根据双馈风电机组(DFIG)的动态和稳态特性,提出了一种计算其无功功率极限的方法.该方法以整个系统的功率关系为基础,在进行机组无功功率极限计算时,除了考虑双馈机组定子、转子和逆变器电流限制外,还考虑了系统稳定运行对输出无功功率的约束,从而为双馈机组控制系统中无功功率输出极限值的设定提供了依据.最后,通过仿真对考虑与不考虑系统稳定性的无功功率计算结果进行了比较.

According to the dynamic and static character of DFIG（double fed inductive generator）,based on the power relationships of overall system,a method is proposed to calculate the reactive power limit of DFIG wind power generation system.Considering the reactive power capacity of the grid side converter,the total reactive power including reactive power of stator and the converter,and the small signal stability of DFIG,we obtain the relationship between reactive power,active power and slip.On the base of the model a method to calculate the reactive power limit of the DFIG is put forward,and the simulant calculation and analysis for a DFIG are carried out.