利用换流器构建有源边界的单端全线速动保护原理  

Single-end Full-line High Speed Protection Principle Using Converter to Construct Active Boundary

作　　者：宋国兵[1,2] 杨佳怡 常仲学 张晨浩 徐瑞东 SONG Guobing;YANG Jiayi;CHANG Zhongxue;ZHANG Chenhao;XU Ruidong(School of Electrical Engineering,Xi’an Jiaotong University,Xi’an 710049,China;State Key Laboratory of Electrical Insulation and Power Equipment(Xi’an Jiaotong University),Xi’an 710049,China)

机构地区：[1]西安交通大学电气工程学院,陕西省西安市710049 [2]电工材料电气绝缘全国重点实验室(西安交通大学),陕西省西安市710049

出　　处：《电力系统自动化》2024年第13期160-170,共11页Automation of Electric Power Systems

基　　金：国家电网有限公司科技项目(52094020006U);国家自然科学基金国际合作与交流项目(52061635105);国家自然科学基金资助(52107123);中国博士后基金资助项目(2021M692525)。

摘　　要：换流器技术变革导致线路边界的无源元件弱化甚至被取消,仅凭单端电气量特征难以实现全线范围内的故障识别。针对该问题,文中充分发挥换流器的高可控性,主动构建换流器对区内外故障的特异性响应特征,建立与单端量保护具有配合关系的有源边界,进而实现单端全线范围的故障识别。在此基础上,进一步讨论有源边界特性的附加控制策略和关键参数的选择依据,并分析有源边界响应在故障回路中的传播规律,进而设计与之配合的单端全线速动保护判据。仿真验证结果表明,所提方法在高阻故障时仍能够可靠识别,提高了传统单端量保护的可靠性和灵敏性。The transformation of converter technology has led to the weakening or even cancellation of passive components at the line boundary,making it difficult to achieve fault identification across the full line length based solely on the single-end electrical characteristics.In response to this issue,this paper fully utilizes the high controllability of the converter,actively constructs specific response characteristics of the converter to internal and external faults,establishes active boundaries that cooperate with single-end quantity protection,and thus achieves fault identification across the full line length at a single end.On this basis,further discussion is conducted on the additional control strategies for active boundary characteristics and the selection criteria for key parameters.The propagation law of active boundary response in fault circuits is analyzed,and a single-end full-line high speed protection criterion is designed to match it.The simulation verification results show that the proposed method can still reliably identify high-resistance faults,improving the reliability and sensitivity of traditional single-end protection.

关 键 词：线路保护 边界保护 有源边界 响应特性 高阻故障识别 

分 类 号：TM46[电气工程—电器]