Smart Selection of Connection Modes in Distribution System Based on Basic Element Theory

A new method of basic element is proposed to classify distribution network connection modes. Basic element is the smallest connection mode with characters of integrity and independent operation in distribution system. Then a dynamic and comprehensive evaluation criterion of basic element connection mode is raised based on fuzzy membership function, to achieve the dynamic and intelligent selection of connection modes according to different focus of planners. The dynamic and comprehensive evaluation of radial connection mode, "2-1" connection mode and three sub-3 liaison connection mode illustrates that the criterion is of strong feasibility and practicability to the selection of typical connection modes in distribution network planning.