Photovoltaic array fault detection method and device

The invention discloses a photovoltaic array fault detection method and device, and relates to the technical field of photovoltaic power generation. The method comprises the steps that electrical quantity parameters corresponding to each photovoltaic cell unit are acquired, and the electrical quantity parameters corresponding to the photovoltaic cell units comprise a plurality of current values, a plurality of voltage values and a plurality of power values corresponding to the photovoltaic cell units; generating a voltage current curve and a voltage power curve corresponding to each photovoltaic cell unit according to the plurality of current values, the plurality of voltage values and the plurality of power values corresponding to each photovoltaic cell unit; determining a first fault detection result corresponding to each photovoltaic cell unit according to a fault analysis rule set, the voltage current curve corresponding to each photovoltaic cell unit and the voltage power curve corresponding to each phot