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Electrochemical energy storage systems have the advantages of fast power response, intensive energy storage, flexible and convenient deployment, but the output characteristics of the battery system directly affect the service effect of the energy storage power plant. Therefore, it is quite necessary to analyze the reliability of battery energy storage and scientifically assess the system’s performance. This paper considers the aging state of the battery storage system as well as sudden failures and establishes a comprehensive reliability assessment method for battery energy storage systems that take into account the battery health index and the impact of thermal runaway failures, which makes up for the shortcomings of existing reliability assessment methods.

Trip to cope with the lightning strike caused around power grid, this paper proposed a transmission line based on the mechanism of lightning strike around all lightning strike tripping around risk analysis method. This method needed to detour lightning tripping thunderstorms and risk analysis of transmission lines tower size, proportion of topography, altitude, insulation configuration data were collected, calculated in turn hit distance, distance and exposure correction of line pressure level and single-base tower above factors lightning strike risk. Based on the calculation model, the lightning wind characteristics under different tower shout height, lightning day and terrain were studied to identify the weak links along the line. Select the composition condition calculation of typical tower lightning strike tripping around risk, based on the same area across the terrain and tower usage of extract weight coefficient calculation all lightning strike tripping around risk, through the typical combination of the weighted average of all lightning strike tripping around risk was analyzed. Through the example analysis, verified the feasibility of this method to improve the reliability of transmission lines.