DC arc detection method

The invention provides a direct current arc detection method. The detection method comprises the following steps: detecting current data of an inverter in real time; current characteristic data of at least one preset frequency band, at least one irradiation disturbance frequency band and at least one electromagnetic disturbance frequency band are extracted from the current data; determining noise data of each preset frequency band according to the current characteristic data of each preset frequency band; determining a current characteristic value of the current period according to the noise data of each preset frequency band; determining a characteristic change rate according to the historical characteristic value and the current characteristic value; determining a first linear correlation degree of the irradiation disturbance frequency band according to the current characteristic data of the irradiation disturbance frequency band; determining a second linear correlation degree of the electromagnetic disturb