An aggregation method of wind farm model for electromagnetic transient simulation analysis

An aggregation method of wind farm considering electromagnetic transient process is given and verified. It includes doubly-fed (wind turbine generators)WTGs, converter-driven WTGs and squirrel cage WTGs with same and different parameters. Simplifications are analyzied. For the aggregation WTG, main parameters of its control and protection system need to be amended besides the main circuit values. Simulation results show that the electromagnetic transient process of a wind farm consisting of WTGs with same type and parameters can be exactly simulated by the aggregation model in this paper. However, for WTGs of same type with different parameters, only wind farms with squirrel cage WTGs can be replaced properly by the aggregation model. In that situation, greater deviations happened in small parts of the fault period for doubly-fed WTGs and converter-driven WTGs wind farms. Additional simulation results show that the deviations are mainly brought by value of the aggregation energy consuming resistance.