Photovoltaic transmission line pilot protection method and system based on Hairinger distance algorithm

The invention discloses a photovoltaic transmission line pilot protection method and system based on a Hailinger distance algorithm, and the method comprises the steps: collecting the three-phase current of a photovoltaic transmission line, calculating the discrete probability distribution of a current sampling value, and carrying out the fault discrimination; calculating the Hailinger distance of the discrete probability distribution of the current sampling values at the two ends of the line, and quantifying the similarity of the discrete probability distribution of the current sampling values at the two ends of the line through the Hailinger distance; and constructing a pilot protection action criterion by using the Hailinger distance, substituting the currents at the two ends of the line, and performing line pilot protection when the protection action criterion is met. According to the method, the similarity of distribution of current sampling values at the two ends of the line after the fault is quantitat