适用于同杆双回线路接地故障改进跳闸与分相自适应重合闸策略  

Improved tripping and phase-separation adaptive autoreclosing strategy suitable for ground fault on double-circuit transmission lines

作　　者：蒋江波 解超 李凤婷[1] 尹纯亚 JIANG Jiangbo;XIE Chao;LI Fengting;YIN Chunya(School of Electrical Engineering,Xinjiang University,Urumqi 830046,China)

机构地区：[1]新疆大学电气工程学院,新疆乌鲁木齐830046

出　　处：《电力科学与技术学报》2024年第3期48-57,共10页Journal of Electric Power Science And Technology

基　　金：新疆维吾尔自治区自然科学基金(2021D01C087)。

摘　　要：同杆双回线路发生接地故障时采用传统跳闸策略可能会产生负序分量,传统自动重合闸方案在合闸前不判定故障性质,重合失败时将影响系统稳定性。针对该问题,提出一种适用于同杆双回线路接地故障改进跳闸与分相自适应重合闸策略。首先,建立同杆双回输电线路各相之间的耦合模型并对其进行分析,提出一种能够避免负序分量注入系统的改进跳闸策略;其次,分别对瞬时性故障情况下和永久性故障情况下电容耦合电压特性进行分析,提出基于故障相电容耦合电压的故障性质判据;最后,结合改进跳闸策略和合闸策略,形成了适用于同杆双回输电线路接地故障分相自适应重合闸策略。通过PSCAD/EMTDC仿真验证了所提分相自适应重合闸策略能够避免负序分量注入系统,以及在不同接地故障类型、故障位置和过渡电阻情况下都能保证输电线路的重合成功率。When a ground fault occurs on double-circuit transmission lines,the conventional tripping strategy may inject negative-sequence components into the system.The traditional autoreclosing scheme does not determine the fault feature before the reclosing,and the stability of the power system will be affected if the reclose fails.To solve the above problems,an improved tripping strategy suitable for ground faults on double-circuit transmission lines is proposed,where phase-separation adaptive autoreclosing is used in the tripping strategy.Firstly,by establishing and analyzing the phase-to-phase coupling model of double-circuit transmission lines,an improved tripping strategy that can avoid the injection of negative-sequence components into the power system is proposed.Secondly,the capacitive coupling voltage characteristics are analyzed under transient and permanent faults respectively,and the fault feature identification criteria based on the capacitive coupling voltage of double-circuit transmission lines is proposed.Finally,the improved tripping and closing strategy are combined to form a phase-separation adaptive autoreclosing strategy suitable for ground faults on double-circuit transmission lines.The PSCAD/EMTDC simulation verifies that the proposed phase-separation adaptive autoreclosing strategy can avoid the injection of negative-sequence components into the system and ensure the reclosing success rate of the transmission line under different ground fault types,fault locations and transition resistances.

关 键 词：自适应重合闸 分相开关 故障性质判据 瞬时性故障 永久性故障 

分 类 号：TM773[电气工程—电力系统及自动化]