Static model of DFIG wind farms considering control strategies

Abstract

The static equivalent models of DFIG grid-connected currents vary under different control strategies. Traditional static equivalent algorithms fail to consider these differences, posing risks in static security analysis. In this study, based on the internal structure of DFIG, grid-connected current models for DFIG under different control strategies are established. The appropriate model is selected during the current calculation process based on the coupling relationship between active power (P) and reactive power (Q) of DFIG. Subsequently, generator nodes to be retained are selected according to the reactive power sensitivity of external network generators based on the internal network, and the node admittance matrix is modified to perform static equivalence. Results show that the proposed model in this study has higher accuracy compared to the traditional Ward equivalent model.