Gradient energy matching type pilot protection method and system for sending-out line of wind power plant

The invention belongs to the technical field of power system relay protection, and particularly relates to a wind power plant sending-out line gradient energy matching type pilot protection method and system.The method comprises the steps that S001, current values on the two sides of a line at a wind power plant sending-out line protection installation position are collected, and current signal edge information is extracted from the current values on the two sides of the line through a multi-resolution morphological gradient; s002, gradient energy values are generated according to the current values on the two sides of the line and the edge information of the current signals, and the DTW distance between the gradient energy values on the two sides is obtained through calculation based on the gradient energy values; s003, judging whether the DTW distance meets a wind power plant sending-out line gradient energy matching type pilot protection criterion or not; the braking amount is adaptively adjusted by constr