Research on Strategy of Voltage Sag Mitigation With Configuration for Dynamic Voltage Restorers in Distribution Network

This paper addresses the problem of the optimal configuration scheme for dynamic voltage restorers (DVR) in distribution networks. The allocation of DVRs serves as an important mean to mitigate the voltage sags that frequently occur and seriously affect the distribution networks. The strategy of the configuration for DVRs have always been concerned by investors, and the appropriate investment decision-making recommendations for DVRs are beneficial for investors to reduce the cost of investment on the premise of satisfying certain governance effects. Therefore, based on the investigation of the current market price of DVRs, the strategies of the configuration for DVRs are given in this paper. The simplified models for series DVR and parallel DVR have been analyzed, and the optimal sizing and placement model for DVRs is implemented to compute the optimal configuration scheme for DVRs. Then, considering the major factors influencing the configuration scheme, including the market price and the proportion of sensitive loads capacity in all loads, the optimal configuration schemes for series DVRs and parallel DVRs are calculated respectively under varying conditions. Finally, the configuration schemes are categorized into three configuration modes and the optimal configuration mode under diverse conditions are summarized for practical application.