AUTHOR=Wang Fengxue , Ou Yangsen , Xin Xi , Yang Moyuan TITLE=Comprehensive Decision-Making Method for DC Transformation Object of Medium Voltage AC Distribution Network JOURNAL=Frontiers in Energy Research VOLUME=10 YEAR=2022 URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2022.906047 DOI=10.3389/fenrg.2022.906047 ISSN=2296-598X ABSTRACT=

The trend of DC development in the medium voltage AC distribution network is obvious. However, due to the constraints of reliability, cost, and power quality, not every AC distribution network is suitable for DC transformation. As for the AC distribution network suitable for DC transformation, it is necessary to solve the problems of multivariable constraint solutions and the demand for sorting and optimizing multi-schemes in DC transformation. Therefore, this study proposes a comprehensive decision-making method for the DC transformation object of the medium voltage AC distribution network. Firstly, a comprehensive evaluation index system for DC transformation is established from four aspects: improving power supply reliability, technical requirements, social benefits, and economic benefits. Among them, the reliability of power supply mainly examines the completion degree of the target. In terms of the technical requirements of DC transformation, it is necessary to consider the constraints of AC transformation and the driving force of DC transformation. As for the social benefits, it reflects the indirect demand for DC transformation, which reflects social development. In terms of economic benefits, it pays attention to the transformation cost and input–output ratio. Then, the combined optimization model is used to solve the index’s comprehensive weight based on the subjective and objective weight model. Moreover, the comprehensive evaluation value of the transformation object is determined by the double-base point method. The scheme optimization model is used to determine the final transformation scheme to guide the power grid enterprises to prioritize the DC transformation projects. Finally, several medium-voltage distribution networks in Guangzhou, Guangdong province, China, are taken as examples to verify the effectiveness of the proposed method.