Variation of Short-circuit Current in the Power System With Large-scale Wind Power Centralized Access

Abstract

The short-circuit current problem is a key issue in the operation control and rational planning of large power grids. With the centralized accsee of large-scale wind farms, the power planning and operation departments are focus on the short-circuit current contributed by wind power. Doubly-fed induction generator (DFIG), the most widely used wind turbine currently, is selected for research in this paper. The short-circuit characteristics of DFIG are analyzed, and a practical model for short-circuit current calculation with multiple wind farms in an actual power grid is constructed. The proposed practical calculation model can simplify the modeling process, and ensure the calculation accuracy. Applying the model, the variation of the short circuit current on the access point is simulated under different access forms and installed capacities. Finally, the contribution of large-scale wind power to the short-circuit current of the regional bus (110kV and above) is given. The result can provide practical reference for the power sectors.