| As the world energy crisis and environmental pollution are growing,Distributed Generation(DG)and MicroGrid that are focused on green energy exploitation have been rapidly developed and promoted.A large number of distributed power supply accessed to distribution network,however,changed the traditional passive distribution network power supply mode,which has a huge influence on the protection disposition of traditional power system.Therefore,the present paper analyzes the configuration and the influence of the micro network protection,a network protection scheme is proposed,the main contentsare as follows:(1)A brief introduction and comparison of several common distributed power supply,the basic concept and structure ofmicro network,and distributed power grid technology standard is introduced and analysis will be performed.of different internal power(2)By applying PSCAD/EMTDC software,simulation model of distribution network including micro networkis established.By simulating analysis,this paper expatiates on the impactof network accessof different internal power to the power flow distribution;the impact of different fault location and micro network access capacity to traditionaldistribution networkcurrent protection;as well as the impact to automatic reclosing of the distribution network.(3)Deals with the impact of the micro network access without distribution network feeder automation,the reclosing mode distribution network feeder automation,and the FTU modedistribution feeder automation to the protection of distribution network,summarizes the five general conclusion,and the implementation methods of three kinds of distribution network protectionstrategies are put forward.(4)Finally,the communication mode of using IEC 61850 agreementwithin the micro site,and micro network clock synchronization mode adopted IEEE1588 protocol is brought up,and the establishment of a mesh network protection scheme is implemented on the basis of framework construction,software design,and hardware design ofnetwork protection system. |
