基于站域信息的同杆双回线接地距离保护优化方案  

Optimization scheme of grounding distance protection based on substation-area information for double-circuit transmission lines on same tower

作　　者：高厚磊[1] 刘益青[2] 王兴国 黄家凯 徐明阳 GAO Houlei;LIU Yiqing;WANG Xingguo;HUANG Jiakai;XU Mingyang(School of Electrical Engineering,Shandong University,Jinan 250061,China;School of Electrical Engineering,University of Jinan,Jinan 250022,China;China Electric Power Research Institute,Beijing 100192,China)

机构地区：[1]山东大学电气工程学院,山东济南250061 [2]济南大学自动化与电气工程学院,山东济南250022 [3]中国电力科学研究院有限公司,北京100192

出　　处：《电力自动化设备》2021年第3期49-56,共8页Electric Power Automation Equipment

基　　金：中国电力科学研究院有限公司科技项目(基于站域信息对变电站后备保护原理性能提升研究)(SGDK0000JBJS1907459)。

摘　　要：基于单间隔电气量的接地距离保护由于受到同杆双回线线间互感的影响,存在故障线路距离测量不准确、非故障线路易发生反方向误动和末端故障超越等问题。利用智能变电站中跨间隔站域信息高度共享的特点,构建了同杆双回线单元式保护配置方案,设计了过程层信息获取及交互的实现方案。利用双回线的断路器位置和接地刀闸位置信息自适应地选择零序补偿系数;利用双回线六相电流信息和六序分量法实现故障选线和选相,根据选线结果实现对故障线路的接地距离保护的邻线零序电流自适应补偿,而对非故障线路不再使用邻线零序电流补偿。理论分析和数字仿真验证表明,所提单元式配置和接地距离保护优化方案可以实现双回线中故障线路接地距离保护的自适应邻线零序电流补偿,并解决了盲目进行邻线零序电流补偿造成的非故障线路反方向误动的问题。Due to the influence of mutual inductance between double-circuit transmission lines on same tower,the grounding distance protection based on single interval electrical quantity has some problems,such as inaccurate distance measurement of fault lines,reverse direction misoperation of non-fault lines and terminal fault override.Based on the characteristics of information sharing between different bays in the smart substation,a unit configuration scheme of double-circuit transmission lines on same tower is constructed.The realization scheme of information acquisition and interaction at the process layer is designed.The zerosequence compensation coefficient is adaptively selected by using the circuit breaker position and the grounding switch position of the double-circuit transmission lines.The fault line and fault phase are selected based on six-phase current information of double-circuit transmission lines and six-sequence component method,and the zero-sequence current self-adaptive compensation of the adjacent line for grounding distance protection is realized according to the line selection results,while the zero-sequence current compensation of the adjacent line is no longer used for the non-fault line.Theoretical analysis and digital simulation show that the proposed scheme of unit configuration and grounding distance protection can realize the zero-sequence current self-adaptive compensation of the adjacent line in double-circuit transmission lines,and solve the problem of reverse direction misoperation of non-fault lines caused by the blind zero-sequence current compensation of adjacent line.

关 键 词：站域信息 同杆双回线 接地距离保护 故障选相 配置方案 

分 类 号：TM773[电气工程—电力系统及自动化]