There is a problem in that the fault component directional element is not suitable for grid-connected large-scale DFIG. Thus a novel parameter identification directional element based on the difference of positive sequence impedance amplitude fluctuation is proposed. First, this paper quantifies the positive sequence impedance fluctuation of a wind farm, analyzes the impact of impedance fluctuation and obtains the rejection boundary of the positive sequence fault component directional element on the wind farm outgoing line. Second, based on the Prony algorithm combined with a band-pass filter, the power frequency is extracted, and the characteristics of the positive sequence impedance amplitude change of the forward and reverse faults on the wind power side of the outgoing line are analyzed. Finally, detrended fluctuation analysis (DFA) is introduced to calculate the fluctuation function, and a novel parameter identification directional element action criterion is constructed to realize the fault direction identification. The simulation results show that the proposed parameter identification directional element is unaffected by the operating conditions of the wind farm, fault types and system oscillations. When the transition resistance reaches 100 ?, it can still correctly determine the fault direction, has strong anti-interference performance, and is suitable for weak feeder power systems with wind power access. This work is supported by the National Natural Science Foundation of China (No. 51877185).