Response Characteristics of Power Grid Rainstorm Convection Disaster to ENSO in Spring and Winter

The occurrence and distribution of rainstorm convection affect the safe operation of power grid. In this study, the response characteristics of power grid rainstorm convection disaster to ENSO in spring and winter are analyzed, by taking lightning as a proxy index. It is found that the increase center of lightning(sever convection) during El Nino spring and winter, and the decrease center of lightning(sever convection) during La Nina spring and winter are both located over the southern side of the Qinghai Tibet Plateau, and the two sides of the Yunnan Guizhou Plateau. During the ENSO period, frequency difference of lightning (sever convection) over the adjacent elevations is mainly reduced. Intensity variations of El Nino events can affect lighting (sever convection) over higher altitudes more dramatically, while La Nina has an opposite characteristic. This study summarizes the temporal and spatial distribution characteristics of lightning over different altitudes during ENSO period, and summarizes the response of lightning and sever convection variation to ENSO intensity, which provides guidance for sever convection protection and lightning protection of power grid under special climatic conditions.