Adaptive distance protection photovoltaic power station power distribution network protection method and device

The invention discloses an adaptive distance protection photovoltaic power station power distribution network protection method and device, and the method comprises the steps: calculating the positive-sequence source impedance and negative-sequence source impedance of a photovoltaic power station through the voltage and current data before a fault, and calculating the positive-sequence fault current and current parameter factors of the photovoltaic power station according to the positive-sequence source impedance and negative-sequence source impedance of the photovoltaic power station; the self-adaptive tripping boundary impedance of the photovoltaic power station is calculated, under the sampling condition, the impedance of each pair of new voltage and current phasors of the photovoltaic power station is updated, a new tripping boundary is continuously corrected, and self-adaptive distance protection of the photovoltaic power station is achieved. The technical problems that a traditional distance protection