Study Of The Technological And Economic Of The Medium Voltage Distribution Network Connection Models

Distribution network is connected directly to users as the end of grid, directly reflecting the users' requirements of safety, reliability, high quality and economy. As users' requirements of power quality have become increasingly demanding, the study of distribution network has been paid more and more attention. The study of connection modes of distribution network is not only an important part of the planning and design of distribution network, but also playing an important role in achieving network's security, economic, and reasonable operation.This paper study the development of distribution network of domestic and international, by comparing the different kinds of connection modes to show the necessity of reliability economic assessment of distribution network.Then we study the factors of load characteristics, capacity of substation and connection modes of medium voltage distribution network. Approximating assumptions to actual situation and combine the planning and design guidelines of distribution network, develop and get a variety of typical planning scenarios, so that laying the foundation of technical and economic comparative analysis of different kinds of connection modes under typical scenes.In the main of economic evaluation index of distribution network, and also taking into account the reliability, safety, adaptability. We proposed a systematic comprehensive assessment system as a basis means and methods of connection modes comparative analysis.Then according to the basis data of distribution network we calculate the technical and economic indicators of medium voltage distribution network. Based on a comprehensive assessment of the technical and economic indicators of results, we proposed recommendations wiring scheme under different planning scenarios.We also focus on the practicality of connection modes of distribution network, provide a reference for the embodiments of connection modes of distribution network under different regions by conducting case analysis of typical distribution network of Hankou district and Jingmen rural grid, using the plan of connection modes of medium voltage distribution network.