Optimal configuration of distributed energy storage based on the identification of voltage-vulnerable nodes

Abstract

With the rapid growth of distributed photovoltaic power generation and its integration into the grid, the power supply pressure on the grid has significantly intensified, and problems such as voltage exceeding the limit and power backflow are prone to occur. Addressing the issues of voltage surpassing thresholds and power reversal in distribution networks due to distributed photovoltaic systems through strategic placement of distributed energy storage has emerged as a principal research target. To this end, this paper first utilizes the Dempster-Shafer evidence theory to calculate the vulnerability of distribution network nodes based on vulnerability indices, selecting the vulnerable nodes. Subsequently, by analyzing the correlation between power and voltage, the sensitivity of voltage at distribution network nodes is determined. A distributed energy storage voltage regulation planning model is established using relevant constraints of energy storage in the distribution network and line-related conditions. Additionally, the voltage regulation scenarios that consider tap changers and static VAR compensation (SVC) are calculated. Ultimately, the efficacy of the suggested approach is validated through simulation on the IEEE 33-bus system.