分布式新能源接入下配电网短路电流预警方法  

The Early Warning Method of Short-circuit Current for the DistributedNew Energy Source Cut-in Distribution Network

作　　者：黄华颖 温喜灵 杨波 HUANG Hua-ying;WEN Xi-ling;YANG Bo(Yunfu Power Supply Bureau,Guangdong Electric Network Co.Ltd.,Yunfu 527300,China)

机构地区：[1]广东电网有限责任公司云浮供电局,广东云浮527300

出　　处：《电气开关》2025年第2期59-62,共4页Electric Switchgear

摘　　要：分布式新能源的接入使得配电网电流的特性变得更为复杂,导致短路电流故障预警难度上升,因此,提出分布式新能源接入下配电网短路电流预警方法。建立分布式电源逆变器的等效电路模型,模拟其并网特性对短路电流的影响,迭代计算IIDG电流与补偿电流直至节点电压变化收敛于预设精度。在此基础上,依托风险判断阈值构建含五级预警信号的全面实时监控系统,并部署短路电流异常预警系统,实现短路电流的精准预警。实验结果表明,设计方法能够有效应对新能源接入带来的复杂性和不确定性,提升配电网短路电流的预警能力,灵敏度符合设计要求。The cut-in of distributed new energy source makes distribution current characteristic more complex,leading short-circuit current fault alarm difficulty to rise.For this reason,put forward the early warning method of short-circuit current for the distributed new energy saerce cut-in distribution network.Set up an equivalent circuit model of distributed power supply in verters,simulate the influence of ist combined in network characteristic on the short-circuit current.Iterate to calculate IIDG current and compensating current until node voltage changes restrain presinstall precision.On the basis of this,rely on risk decision threshold to structure the all-round real time monitoring system containing pentode warning signals,and arrange the abnormal warning system of short-circuit current so as to achieve accurate warning of the short-circuit current.The experimental results show the design method can effectively deal with complexity and uncertainty produced by the new energy source cutin,improve the warning ability of the distribution nework short-circuit current and the sensitivity meet with the requirements of degign.

关 键 词：分布式新能源 配电网接入 短路电流 等效电路模型 预警机制 

分 类 号：TM744[电气工程—电力系统及自动化]