The Segmented Frequency Response Model for Power System with Wind Generations Considering Synthetic Inertia Control

During the frequency regulation process, the Doubly-fed Induction Generation (DFIG) based on synthetic inertia (SI) control is likely to exit frequency regulation due to its speed protection. The current physical model-based system frequency response (SFR) model has problems of low accuracy and complex calculation. To this end, the SFR model for frequency regulation and rotor speed recovery phases are established. When consider the diversity of wind speed in the wind farm, the wind turbine generators (WTG) can be aggregated segmentally according to the frequency regulation exiting time of each WTG, which greatly reduces the dimension and improves the accuracy of the model. Finally, the model is applied in the modified 10-generator 39-bus system. The simulation results show that the segmented SFR model has good accuracy and fast calculation speed.