A Novel Superimposed Phase Selection Method for Transmission Line of DFIG-based Wind Farm

摘要

The transient characteristics of large-capacity wind farms will present challenges to traditional phase selection methods. This paper analyzes the fault current and equivalent impedances of the doubly-fed introduction generator (DFIG), and proposes a novel phase selection method. The method uses the amplitude of the ratio of one phase fault component and the other two phases’ phase difference fault component as a factor, and combines the voltage factor and current factor through a self-adaptive coefficient. Then it constitutes the criteria for phase selection according to characteristics of different fault types. The method solves the problem that the fault component on the wind farm side is too small, and shows better sensitivity with the relative change of the strength of the wind farm. The simulation results show that the performance of the traditional superimposed phase selector in the system with wind farms is improved with the proposed method.