Lightning risk assessment of active distribution network with distributed photovoltaic system

Lightning strikes are the main reason for the fault of active distribution network. It is of great significance to study the risk assessment of lightning in active distribution network for lightning protection. Taking an active distribution network in a certain region as the research object, considering the mutual influence between the photovoltaic side and the distribution line side during lightning strikes, the method of lightning risk assessment for the active distribution network with photovoltaic system was proposed. Electrical geometric models were constructed to calculate the fault rate of the photovoltaic side and the trip rate of the distribution line side, and the risk assessment was conducted based on the calculation results. The results show that when the lightning strike is closest to the tower on the photovoltaic side, the lightning fault rate on the photovoltaic side increases from 0.957 times/year to 3.0766 times/year. When the photovoltaic side is struck by lightning, the intrusion of lightning impulse can double the lightning trip rate of the adjacent three towers on the distribution line side, indicating a higher risk level. It is recommended to focus on the protection measurement for the three towers near the photovoltaic system.