基于准两相跳闸的同杆双回输电线路跨线故障跳闸策略  

Quasi Two-Phase Tripping Based Line-To-Line Fault Tripping Strategy on Double-Circuit Transmission Lines on the Same Tower

作　　者：周伟绩[1,2] 李凤婷[1] 解超 王宾[3] 岳菁鹏 ZHOU Weiji;LI Fengting;XIE Chao;WANG Bin;YUE Jingpeng(School of Electrical Engineering,Xinjiang University,Urumqi 830047,China;College of Mechanical and Electrical Engineering,Shihezi University,Shihezi,Xinjiang 832000,China;State Key Laboratory of Control and Simulation of Power System and Generation Equipments,Tsinghua University,Beijing 100084,China;Electric Power Research Institute of Guangdong Power Grid Co.,Ltd.,Guangzhou 510030,China)

机构地区：[1]新疆大学电气工程学院电气系,乌鲁木齐830047 [2]石河子大学机械电气工程学院电气系,新疆石河子832000 [3]电力系统及发电设备控制和仿真国家重点实验室(清华大学),北京100084 [4]广东电网有限责任公司电力科学研究院,广州510030

出　　处：《南方电网技术》2023年第11期130-137,147,共9页Southern Power System Technology

基　　金：国家自然科学基金资助项目(51877185)。

摘　　要：同杆双回输电线路采用综合跳闸策略和准三相跳闸策略,在线路故障时可能跳开双回输电线路所有相,导致含有风电、光伏等弱稳定系统大面积切机、甩负荷,使得电网输电环境恶化,严重降低电力系统运行稳定性。针对此问题,提出了适用于同杆双回输电线路跨线接地故障准两相跳闸策略,降低跨线故障双回输电线路所有相跳闸几率的同时为故障相提供稳定耦合源。首先采用拓扑分析方法对输电线路综合跳闸策略和准三相跳闸策略建立模型,分析得到跳闸策略对故障性质判定影响机理;其次考虑线路输电连续性及故障性质判定统一性,提出适用于同杆双回输电线路跨线故障准两相跳闸策略。最后通过PSCAD/EMTDC仿真实验验证了准两相跳闸策略的正确性和可行性。The comprehensive tripping strategy and quasi three-phase tripping strategy are adopted for the double-circuit transmission lines on the same tower,which may trip all the phases of the double-circuit transmission line during line faults,and result in large-area generator tripping and load shedding of weakly stable systems including wind power and photovoltaic,which worsens the transmis-sion environment of the power grid and seriously reduces the operation stability of the power system.In response to this issue,a quasi two-phase tripping strategy suitable for cross-line grounding faults in double-circuit transmission lines on the same tower is proposed,which can reduce the tripping probability of all phases of double-circuit transmission lines and provide a stable coupling source for the fault phase.Firstly,the topology analysis method is used to establish models for the comprehensive tripping strategy and quasi three-phase tripping strategy of transmission lines,and the impact mechanism of the tripping strategy on fault property determination is analyzed.Secondly,considering the consistency of transmission continuity and fault nature judgment,a quasi two-phase tripping strategy suitable for cross-line faults on double-circuit transmission lines on the same tower is proposed.Finally,the correctness and feasibility of the quasi two-phase trip strategy are verified through PSCAD/EMTDC simulation experiments.

关 键 词：同杆双回输电线路 跨线故障 拓扑分析 准两相跳闸策略 

分 类 号：TM75[电气工程—电力系统及自动化]