A power flow transfer optimization strategy for important transmission channels based on lightning early warning

Abstract

With the substantial increase in global thunderstorm activities, the hazards of thunder and lightning to the security of the power grid are increasingly not to be ignored. Due to the large scale of the power grid, the small probability event that the trip of inter-provincial tie line of the same tower due to lightning strikes may still trigger the accident cascade effect of the power grid, which seriously threatens the power supply reliability of the power grid. This paper proposes an active lightning protection measure based on lightning warning which adjusts the power flow of transmission lines that are threatened by lightning strikes by controlling the output of key power sources. And it is different from the traditional static lightning protection measures such as erecting lightning shield lines. This paper also establishes a power flow transfer optimization model that takes into account system constraints such as generator output. Finally, taking the actual large-scale system of Central China Power Grid as an example, the implementation process of the proposed lightning protection strategy is simulated and analyzed, and the research results have reference value for the lightning protection of important power transmission channels.