A Study on Connection Point Selection Strategy in Low-Voltage Grid Expansion Digitalization Considering Three-Phase Imbalance Degree

This study addresses the challenge of connection point selection in low-voltage grid expansion under digitalization, focusing on mitigating the issue of three-phase imbalance. Traditionally, connection decisions have been primarily based on proximity and subjective judgment, often disregarding the subsequent impact on system imbalance and efficiency. This paper presents an improved approach that systematically evaluates connection points, taking into account both line costs and the three-phase imbalance degree. Through a case study, we demonstrate that our proposed method, compared to conventional practices, can effectively reduce the three-phase unbalance degree, while slightly increasing the line cost. Despite the marginal increase in cost, the comprehensive benefits including improved power quality and system stability justify the adoption of our strategy. The implementation of this strategy is expected to enhance customer satisfaction and contribute to the sustainable development of power distribution systems.