摘要
中压微电网的接入改变了传统配电网的辐射型结构,使配电网可以多端供电方式运行。单相接地故障是配电系统频发的故障类型,而多端供电运行使得配电网的接地故障特性复杂化,传统的单相接地选线方法不再适用。先分析中压微电网和中压配电网的网络结构,并建立了中压微电网接入的多层级多端供电配电网模型;然后,以两级母线节点为视角分析了小电流接地方式下多端供电配电系统的单相接地故障特征,进而基于故障特性的分析,提出适用于微电网接入的多端供电网络选线方法;最后,在装备布局、选线任务分配等方面进行了详细设计,构成了一套完备的自动化选线系统。所提选线方案以两级母线节点为依托,可以类比应用于多层级多端供电运行的配电网络。研究结果表明,本文所提选线方案可有效应用于中压微电网接入的多端供电运行配电网。
The access of the medium-voltage(MV)microgrid changes the radial structure of the traditional distribution network,causing the distribution network to operate in a multi-terminal power supply mode.The single-phase grounding(SPG)fault is a frequent fault type in distribution system,and multi-terminal power supply operation complicates the grounding fault characteristics of the distribution network.Thus,the traditional SPG line selection method is no longer applicable.This paper analyzes the network structure of the MV microgrid and the MV distribution network and establishes a multi-level multi-terminal power supply distribution network model with MV microgrid access.Then,the SPG fault characteristics of the multi-terminal power supply distribution system under the small current grounding mode are analyzed from the perspective of two-level bus nodes.Furthermore,based on the analysis of fault characteristics,a line selection method suitable for multi-terminal power supply networks with microgrid access is proposed,and a detailed design is carried out in terms of equipment layout and line selection task allocation,forming a relatively complete automatic line selection system.At the same time,the proposed line selection scheme is based on the two-level bus nodes,which can be analogously applied to the multi-level multi-terminal power supply distribution network.The simulation results show that the proposed line selection scheme can be effectively applied to the multi-terminal power supply distribution network with MV microgrid access.
作者
王巍
卢庆辉
吕帅
崔瑞
杨鹏
尹项根
乔健
WANG Wei;LU Qinghui;LYU Shuai;CUI Rui;YANG Peng;YIN Xianggen;QIAO Jian(Ordos Power Supply Branch,Inner Mongolia Power(Group)Co.,Ltd.,Ordos 017010,China;State Key Laboratory of Advanced Electromagnetic Engineering and Technology,Huazhong University of Science and Technology,Wuhan 430074,China)
出处
《电力科学与技术学报》
北大核心
2025年第2期110-121,共12页
Journal of Electric Power Science And Technology
基金
国家自然科学基金(52007010)。
关键词
中压微电网
多端供电
单相接地故障
故障选线
medium-voltage microgrid
multi-terminal power supply
single-phase grounding fault
fault line selection
