A pilot protection method for the wind farm transmission line based on interaction power difference

•Pilot protection method for wind farm transmission line based on interaction power difference.•Only needs to transmit the fault direction identification results between two ends of the AC line.•Can distinguish different types of internal and external faults reliably.•Highly immune to the fault resistance and is not affected by the fault location.•Interaction power is decomposed into inter-generator and generator-grid interaction power.