Applied Research On High-Reliability Connection Modes In Medium Voltage Distribution Network

With the development of economy and society in our country,the requirement of users about distribution network reliability is becoming higher and higher.China's medium-voltage distribution network has been in a state of natural development for a long time while the structure of distribution network is the key factor affecting the power supply reliability.However,the planning and construction of distribution network is still lack of guidance currently.How to select a reasonable connection mode to improve distribution network reliability is a problem urgently to be solved in the planning and construction of distribution network.This paper starts with the research and analysis of the high-reliability "triple-double" connection mode.This paper proposed a power supply reliability evaluation model extends to low voltage user and economic comparison model based on whole life cycle.The two models are applied to the calculation examples of reliability and economy evaluation of "triple-double" connection,so as to clarify the applicable scope of "triple-double" connection.Through the research on distribution automation of "triple-double" connection,the "triple-double" connection is integrated with the construction of distribution automation.By summarizing and refining the conventional distribution network,the typical transition scheme and the typical "double access" scheme are proposed.Finally,a case study is carried out in the pilot areas.The application results show that the "triple-double" connection has obvious advantages in reliability,economical and reasonable in the area of high load density.This paper is an attempt to analyze the connection mode of Medium-voltage distribution network under the demand of high power supply reliability.Through the comprehensive analysis of the "three-double" connection mode,the application scope,application method and typical scheme of "three-double" connection mode are summarized,provides a feasible thinking and realization way for the planning and construction of high reliability medium voltage distribution.