摘要
针对多端柔性直流配电网的故障快速识别、定位及隔离这一关键技术难题,利用配电网中相邻直流配电终端节点的故障识别特征信息,提出一种基于面向通用对象的变电站事件(GOOSE)等通信方式的直流配电网分布式区域保护方法,能够实现故障快速定位及隔离功能。首先将复杂的直流配电网通过网格化分解成若干个有限区域单元,每个区域单元就是一个独立的故障预判区,然后提出一种依靠直流配电终端的GOOSE通信,在故障预判区内通过比较中心节点和边界节点配电终端的带方向电流状态值来实现故障定位,并通过直流断路器来隔离故障的保护策略。最后,在实时数字仿真系统中搭建三端柔性直流电网模型,仿真结果验证了该保护方案在不同直流故障和运行情况下的有效性和准确性。
Aiming at the key technical problem of fast fault identification,location and isolation of multi terminal flexible DC distribution network,based on the fault identification characteristic information of adjacent DC distribution terminal nodes in the distribution network,a distributed area protection method for DC distribution network based on generic object oriented substation event(GOOSE)and other communication modes is proposed to realize the function of fault location and isolation.Firstly,the complex DC distribution network is divided into several finite area units by gridding,and each area unit is an independent fault prediction area.Then,a GOOSE communication based on DC distribution terminal is proposed.In the fault prediction area,the fault location is realized by comparing the band direction current state values of the distribution terminals of the central node and the boundary node,and the fault location is realized by DC distribution terminal circuit breaker.Finally,a three terminal flexible DC grid model is built in real time digital simulation(RTDS),and the simulation results verify the effectiveness and accuracy of the protection scheme under different DC faults and operation conditions.
作者
李辉
吴海
胡国
鲍柏舟
LI Hui;WU Hai;HU Guo;BAO Baizhou(NARI Technology Development Limited Company,Nanjing 211106)
出处
《电气技术》
2022年第4期70-75,81,共7页
Electrical Engineering
关键词
多端柔性直流配电网
GOOSE通信
故障识别
故障定位
故障隔离
分布式区域保护
multi terminal flexible DC distribution network
GOOSE communication
fault identification
fault location
fault isolation
distributed area protection
