Dynamic equivalence to induction generators and wind turbines for power system stability analysis

With increasing installation capacity and energy production, wind power plays more important role in power systems. In transient stability analysis, detailed modeling to each induction generator and wind turbine will introduce lots of calculation effort, which necessitates dynamic equivalence to induction generators and wind turbines in the same wind farm, or wind farms closely located. In this paper, weighted equivalence is proposed for the wind turbines and the induction generators in the same wind farm, and coherency-based equivalence is given to aggregate the wind farms at different sites. The transient response of power system against a short-circuit fault is studied. The electrical parameters, e.g. the angular velocity of wind turbine, slip of induction generator, active and reactive output of wind farm, power angle and frequency of synchronous generator, and bus voltage, are quantified and compared to validate the feasibility and accuracy.