特勒根似功率保护在同塔双回交流输电线路中的应用  

Application of Tellegen’s Quasi-power Protection in Double-circuit AC Transmission Line on the Same Tower

作　　者：刘世明[1] 曾琦器 赵文琛 张超[1] 蒋林[2] LIU Shiming;ZENG Qiqi;ZHAO Wenchen;ZHANG Chao;JIANG Lin(State Key Laboratory of Intelligent Power Dispatching and Control of Ministry of Education(Shandong University),Jinan 250061,Shandong Province,China;University of Liverpool,Liverpool L693BX,UK)

机构地区：[1]电网智能化调度与控制教育部重点实验室(山东大学),山东省济南市250061 [2]利物浦大学,英国利物浦L693BX

出　　处：《电网技术》2024年第3期1322-1330,共9页Power System Technology

基　　金：国家自然科学基金面上项目(51677108)。

摘　　要：随着我国电网规模快速扩张,输电通道资源日渐紧缺,同塔多回输电技术逐渐得到广泛应用。超/特高压远距离输电线路一般以差动保护作为双重主保护,与纵联距离/方向保护构成双重化配置。但用于同塔双回输电线路时,分布电容电流将影响差动保护的灵敏度;同时,由于双回线线间和相间较强的电磁耦合作用,线间互感的影响将会降低纵联距离、纵联方向保护判断的正确性,导致原来的保护配置方案难以直接应用。将特勒根似功率保护原理推广至同塔双回线路,提出了一种基于特勒根似功率定理的同塔双回输电线路纵联保护方法,能够不受双回线内部复杂电磁耦合、分布电容、系统负荷等影响,并验证了该保护的对时方案在双回线路中的适用性。采用MATLAB/Simulink仿真软件搭建1000kV特高压同塔双回输电线示范工程模型,经大量仿真实验,验证了所提保护方法的有效性。With the continuous development and expansion of China's power grid,there has been an increasing shortage in the transmission channel resources,thus the multi-circuit transmission lines on the same towers are gradually being widely used.The EHV/UHV long distance transmission lines generally use the differential protection as the dual main protection,which forms the dual configurations of the main protection with the longitudinal distance protection or the longitudinal direction protection.However,these protection configurations are not completely applicable to the double-circuit transmission lines because the sensitivity of the differential protection is affected by the load current and the distributed capacitive current.The judgment of the longitudinal distance protection and the longitudinal direction protection is affected by the mutual inductance between the lines.This paper proposes a protection approach for double-circuit transmission lines on the same tower based on the Tellegen’s quasi-power theorem.The approach is not affected by the electromagnetic coupling,the distributed capacitance and the load condition.This paper verifies the applicability of the time synchronization method in the double-circuit transmission lines.A simulation model for the ultra-high voltage(UHV)Double-circuit Transmission Lines on the Same Tower demonstration project in China is established by using the MATLAB/Simulink,and the extensive simulation studies guarantees the effectiveness of the proposed protection approach.

关 键 词：特勒根似功率定理 双回输电线路 纵联保护 双重化配置 

分 类 号：TM721[电气工程—电力系统及自动化]