Study Of Operation State Assessment For Intelligent Distribution Network Based On Ubiquitous Power Internet Of Things

In recent years,intelligent distribution network has entered the stage of rapid construction in our country.At the same time,scale of distribution network and number of equipment have sharply increased.At present,number of operation and inspection personnel has been difficult to meet the needs of normal inspection for distribution network.Therefore,operation statuses of intelligent distribution network are evaluated through advanced communication networking,intelligent sensing,big data processing and other technologies which has been widespreadly concerned by power companies to timely find hidden dangers,master the operation statuses of equipment and system.In view of composition characteristics of intelligent distribution network,current maintenance requirements and technology situations,research achievements of author in the field of distribution network are utilized and the ubiquitous power internet of things construction concept of State Grid is specially applied to evaluate operation statuses of intelligent distribution network equipments and system in this thesis.Onsite operation inspection efficiency and operation situation of whole distribution network those are controlled by back-end system are improved,operation status of intelligent distribution network system are timely mastered through hierarchical evaluation schemes those are given in this thesis.The main work contents of this thesis are as follows:(1)Concepts and characteristics of ubiquitous power internet of things and edge computing are analyzed.Low-power wireless self-organizing network Lo Ra communication technology is especially studied and compared with other communication technologies.A design scheme of distribution network intelligent IOT terminal which is used to gather,compute and send back-end system on-site information is studied.At the same time,taking switch cabinet which is commonly used in the intelligent distribution network as an example,information collection scheme of operation status is designed which provides a reference for operation information collection of other equipments.(2)Evaluation indexes of intelligent distribution network operation status are constructed.Determination and fusion methods of subjective and objective weight are studied about evaluation indexes and comprehensive weights those are obtained through the fusion methods are determined final weights of evaluation indexes.Evaluation methods of distribution network operation statuses are analyzed.(3)Referring to construction concept of ubiquitous power internet of things,front-end evaluation scheme and back-end comprehensive evaluation scheme of intelligent distribution network operation status are studied based on edge computing.Advantages of the proposed schemes are analyzed and an example of switch cabinet information collection and transmission is given.The hierarchical evaluation schemes those are given in this thesis can not only reduce transmission amount of unnecessary information,decrease transmission pressure of communication system and workloads of operation maintenance personnel but also provide guidance for on-site inspection personnel to master operation statuses of equipments,solve hidden dangers of system in a shorter time and ensure reliable supply of power.