交流特高压输电线路行波差动保护研究  

Study on traveling-wave differential protection of UHV AC transmission line

作　　者：刘新军 方健美 周仁才 徐思敬 LIU Xinjun;FANG Jianmei;ZHOU Rencai;XU Sijing(Ningbo Beilun Power Company,Ningbo 315800,China;Zhejiang Donghe Engineering Design Co.,Ltd.,Ningbo 315040,China;State Grid Ningbo ELectric Power Supply Company,Ningbo 315000,China)

机构地区：[1]国网浙江省电力有限公司宁波市北仑区供电公司,浙江宁波315800 [2]浙江东禾工程设计有限公司,浙江宁波315040 [3]国网宁波供电公司,浙江宁波315000

出　　处：《电气应用》2020年第4期49-56,共8页Electrotechnical Application

摘　　要：为了有效解决传统行波电流差动保护无法满足带高压并联电抗器特高压输电线路应用要求的问题,提出了一种新的行波差动保护方法。通过计算三相电压、三相电流暂态量,经过相模解耦变换,得到行波电流模分量;然后以线路两端初始方向电流行波波头在前数十微秒内的积分作为特征值构成新的保护动作判据。该判据能够有效地躲过系统正常运行和区外故障引起的暂态不平衡差流,同时对区内各种故障都有较高的灵敏度。理论及仿真计算表明,该方法动作可靠,速度快,能够在现有的技术条件下实现,具有较高的实用价值。In order to effectively solve the question of the traditional traveling-wave differential protection cannot be applied to UHV AC transmission line with high voltage shunt reactor,a new method of traveling-wave differential protection is proposed.Obtaining three-phase voltage and current transients,module components are got by decoupling transformation,then the integral value of initial wave fronts at both of the line terminals for tens micro seconds is taken as eigenvalues which compose the action criterion.The application of the criterion not only avoid transient unbalance differential currents impacts under the system normal operation and external faults conditions,but also has high sensitivity for all internal faults.Theoretical analysis and Matlab simulation show that the method presented is reliable as well as with rapid response.The new protection has high practical value,can be achieved under the existing technical conditions.

关 键 词：电力系统 行波差动保护 交流特高压 高压并联电抗器 相模解耦变换 

分 类 号：TM75[电气工程—电力系统及自动化]