Lightning stroke risk assessment method and system for distributed photovoltaic active power distribution network

The invention discloses a lightning stroke risk assessment method for a distributed photovoltaic active power distribution network, and the method comprises the following steps: building a lightning stroke simulation calculation model of the active power distribution network, and carrying out the calculation through the simulation calculation model; calculating the fault rate according to the ground lightning density information and the photovoltaic side fault lightning resistance level; the flashover rate is calculated according to the ground lightning density information and the line side flashover lightning resistance level; summarizing the failure rate of the photovoltaic side and the failure rate of the photovoltaic side of the lightning stroke line to obtain the total failure rate of the photovoltaic side, and obtaining the annual average electric energy loss through the total failure rate of the photovoltaic side; and summarizing the flashover rate of the line side and the flashover rate of the lightni