Dynamic Clustering Equivalence of Wind Farms Considering Impacts of Collection Lines

Abstract

This paper focuses on the problem of low accuracy when wind farms are dynamically equated without considering the impacts of collection lines and proposes a dynamic cluster equivalence method of coherent generators. Based on hierarchical clustering analysis, it considers the intra-site impacts of collection lines. Firstly, it uses the rotor current of the doubly fed induction generator (DFIG) as the characteristic quantity to analyze the influence of the topology in the doubly fed wind farm (DFWF) and the collection lines on the dynamic process. Then, it uses hierarchical clustering method to correlate the disturbed trajectory of rotor current of the intra-site DFIGs and obtains the dynamic clustering results. Finally, according to the equivalent power loss method, the equivalent parameters of the collection network and the DFIGs are given to obtain a multi-machine equivalent model. The proposed clustering method is validated by simulation results.