Abstract: To address the low reliability of traditional fault sequence component phase selection in an inverter-interfaced wind power access system, an improved fault sequence component phase selection method is proposed. First, the fault sequence impedance characteristics of the wind power side and the adaptability of the traditional fault sequence component phase selection element are analyzed in the latest low voltage-through strategy of a wind farm. Then negative positive sequence and negative zero impedance phase difference are used to the equivalent positive and negative sequence current branch coefficient phase difference so that the phase angle error of the traditional sequence compensating phase selection criterion can be compensated. Finally, the compensated fault sequence current phase difference is used as the phase selection criterion, and the fault phase identification is realized. The method has better resistance to transition resistance by adjusting the zero negative sequence phase selection partition. The simulation results show that the improved method can reliably select the fault phase with various fault types, different fault locations and transition resistance.