Sensitivity Analysis of Influence Factors of Parallel Capacitor Switching Overvoltage Based on Sobol’

Due to the need for power quality, parallel reactive compensation devices are frequently switched on and off, and the harm caused by switching overvoltage and inrush current cannot be ignored. Therefore, it is necessary to equip overvoltage and inrush current suppression devices. Engineering practice shows that even with suppression devices, there are still insulation damage events caused by inrush current or overvoltage. In response to this problem, this paper proposes an analysis method for the influence factors of capacitor switching overvoltage based on Sobol’. The paper first analyzes the influence factors of capacitor group switching overvoltage and inrush current from the mechanism, and on this basis, constructs a Sobol’ influence factor calculation model. From both local and global perspectives, it quantifies the influence of each influencing factor on the capacitor switching overvoltage, and determines the key factors based on this. Based on the test system, a simulation model is built to simulate various working conditions of capacitor switching. On the basis of obtaining a large amount of data, the proposed method is used to analyze the key influencing factors of capacitor switching overvoltage and inrush current, which can provide certain reference for engineering overvoltage suppression.