Lightning risk estimation and preventive control method for power distribution networks referring to the indeterminacy of wind power and photovoltaic

Abstract

• An estimation model based on the prediction of distributed power is put forward to calculate the operating risk of distribution network in lightning weather. • A two-step preventive protection strategy, namely the power flow transferring based on topological reconstruction, and the coordination of the controllable resource, is put forward. • Simulation shows topological reconstruction and the optimization to the distributed power source can improve the stability of distribution system operation, and cut down the load loss in extreme weather. The power distribution networks are deeply influenced by the lightning weather. Such impact includes not only the load loss caused by the outage of the overhead lines due to direct and/or indirect lightning strikes, but also the output fluctuation of the wind power and photovoltaic (PV) connected to the network. Since lightning storms can be forecasted to some extent, it would be useful to establish a model for lightning risk estimation and preventive control of the distribution network, in order to cut the economic loss in extreme weather. In this paper, the scene analysis method is used to simulate the indeterminacy of the wind and PV output based on the lightning storm pre-warning, and the lightning risk and operating state of the distribution networks can be estimated. Referring to the results, lightning preventive strategy of distribution network can be formulated by network topology reconstruction and resource synergy.