基于特性参数自适应修正的花瓣式配电网反时限过电流保护方法  

Parameter adaptive correction based inverse-time overcurrent protection method of petal-shaped distribution network

作　　者：陈晓龙[1] 闫若璇 李永丽[1] 李仲青 蒋帅 耿少博 CHEN Xiaolong;YAN Ruoxuan;LI Yongli;LI Zhongqing;JIANG Shuai;GENG Shaobo(Key Laboratory of Smart Grid of Ministry of Education,Tianjin University,Tianjin 300072,China;China Electric Power Research Institute,Beijing 100192,China;State Grid Hebei Electric Power Company,Shijiazhuang 050000,China)

机构地区：[1]天津大学智能电网教育部重点实验室,天津300072 [2]中国电力科学研究院有限公司,北京100192 [3]国网河北省电力有限公司,河北石家庄050000

出　　处：《电力自动化设备》2023年第4期143-151,共9页Electric Power Automation Equipment

基　　金：国家电网有限公司总部科技项目(适应灵活可控源荷接入的新型城市电网继电保护关键技术研究及应用)(5100-201913019A-0-0-00)。

摘　　要：闭环运行的花瓣式配电网具有更为复杂的故障特性,导致传统保护方法难以满足选择性和速动性要求。针对这一难题,分析了花瓣式配电网的短路故障电流特性,揭示了故障点上、下游故障电流随故障位置移动的变化规律,并指出定时限过电流保护与标准反时限过电流保护应用于花瓣式配电网时存在的问题;结合花瓣式配电网的故障电流特性,提出一种基于特性参数自适应修正的反时限过电流保护方法,仅利用本地电流信息对反时限特性参数进行自适应修正,能够在保障保护选择性的同时显著提升保护速动性;基于PSCAD/EMTDC仿真软件搭建10 kV花瓣式配电网模型对所提保护方法进行验证,仿真结果表明该保护方法能在提升保护选择性和速动性的同时,克服传统保护方法应用于花瓣式配电网时的局限性。The petal-shaped distribution network under closed-loop operation has more complex fault charac⁃teristics,which makes it difficult for traditional protection methods to satisfy the requirements of selectivity and speed.Aiming at this problem,the short circuit fault characteristics of the petal-shaped distribution net⁃work are analyzed.The variation trend of both upstream and downstream fault currents with the changing of fault location is revealed.And the problems encountered in the application of definite-time and standard inverse-time overcurrent protection to petal-shaped distribution network are clarified.Then,combined with the fault current characteristics of the petal-shaped distribution network,a parameter adaptive correction based inverse-time overcurrent protection(PACITO)method is proposed.The PACITO only uses the local current information to adaptively correct the inverse-time characteristic,which can significantly improve the speed of protection while ensuring selectivity.A 10 kV petal-shaped distribution network model is established in PSCAD/EMTDC simulation software to verify the PACITO method.The simulative results prove that the proposed protection can improve protection selectivity and speed while also overcoming the drawbacks of traditional petal-shaped distribution network protection methods.

关 键 词：花瓣式配电网 反时限过电流保护 特性参数自适应修正 速动性 选择性 

分 类 号：TM77[电气工程—电力系统及自动化]