一种适用于中压直流配电网单极故障的保护方法  

A New Type of Protection Method Suitable for Single-pole Fault in Medium Voltage DC Distribution Network

作　　者：高淑萍[1] 邵明星 宋国兵[2] 段必聪 徐振曦 GAO Shuping;SHAO Mingxing;SONG Guobing;DUAN Bicong;XU Zhenxi(School of Electrical and Control Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安科技大学电气与控制工程学院,陕西西安710054 [2]西安交通大学电气工程学院,陕西西安710049

出　　处：《湖南大学学报（自然科学版）》2021年第8期78-89,共12页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51777166);国家自然科学基金联合基金重点支持项目(U1766209);国家留学基金委资助项目~。

摘　　要：针对中压直流配电网线路保护尚不完善这一问题,提出一种基于零模功率的单极故障保护方法.首先,分析直流配电网中线路发生单极故障时的故障特征,利用暂态电流分量的极性进行区内、外故障识别,利用零模功率幅值的大小进行故障线选择,利用零模电压的大小进行故障极选择.其次,对所提保护方法给出了整定判据.最后,在PSCAD/EMTDC中搭建直流配电网模型用以输出故障数据,利用MATLAB进行保护方法验证.结果表明,所提方法快速有效,可靠性高,耐受过渡电阻的能力较强,对数据延迟不敏感,且抗干扰能力较强.In order to solve the problem of imperfect line protection in medium voltage DC distribution network,a single-pole fault protection method based on zero-mode power is proposed in this paper.Firstly,the characteristics of single-pole fault in the DC distribution network are analyzed.Fault identification is carried out by using the polarity of the transient current component,fault line selection is realized by using the magnitude of zero-mode power amplitude,and fault pole selection is implemented by using the magnitude of zero-mode voltage.Secondly,the setting criteria are given for the proposed protection method.Finally,a DC distribution network model is built in PSCAD/EMTDC to output fault data,and MATLAB is used to verify the protection method.The simulation results show that the proposed method is fast and effective,highly reliable,and has a strong ability to withstand transition resistance.It is not sensitive to data delay and has a strong anti-interference ability.

关 键 词：直流配电网 电流极性 相模变换 零模功率 继电保护 

分 类 号：TM77[电气工程—电力系统及自动化]