基于4G通信的配电网分布式智能保护控制技术研究

Research on Distributed Intelligent Protection and Control Technology of Distribution Network Based on 4G Communication

为解决分布式电源大规模接入时传统单向型保护失效,以及配电网多分支、多级联结构导致级差配合困难等问题,提出一种基于4G通信建立配网馈线自动化端到端通信架构,将计算节点下沉至每个终端,其保护动作不依赖于主站,动作迅速;提出终端本地计算的保护启动判据和基于通信的动作判据,通过与变电站出线开关的级差配合,构建基于4G通信的配电网分布式智能保护方案;在RTDS半实物仿真平台上进行验证。仿真结果表明,该方案能够迅速切除相间短路、单相接地等各种故障,精准实现故障定位与隔离,并可靠恢复非故障区域的正常供电。该方案已在辽宁省沈阳市某区域示范应用,取得了良好的效果,能够显著减少停电范围和停电时间,提升电网故障消除效率。

In order to solve the problems such as the failure of traditional one-way protection when distributed power supply is connected on a large scale,and the difficulty of coordination between stages caused by the multi-branch and multi-level connection structure of the distribution network,an automatic end-to-end communication architecture of the distribution network feeder line has been proposed based on 4G communication.The computing node is sunk to each terminal,and its protection action is fast and independent of the main station.The protection start criterion of terminal local calculation and the action criterion based on communication are proposed,and the distributed intelligent protection scheme of distribution network based on 4G communication is constructed by cooperating with the level difference of substation outlet switch,and verified on RTDS semi-physical simulation platform.The simulation results show that the proposed scheme can quickly remove various faults such as interphase short circuit and single-phase grounding,accurately locate and isolate faults,and reliably restore normal power supply in non-fault areas.The scheme has been demonstrated and applied in a certain area of Shenyang,Liaoning Province,and has achieved good results,which can significantly reduce the scope and time of power outage,and improve the efficiency of power grid fault elimination.