基于单端电气量的不对称参数同塔四回线选相方法  

Fault Phase Selection Scheme for Quadruple-Circuit Transmission Lines with Asymmetrical Parameter Based on Single-Ended Electrical Quantities

作　　者：刘琦[1] 邰能灵[1] 范春菊[1] 于仲安[2] 尚瑨[1] 

机构地区：[1]上海交通大学电子信息与电气工程学院,上海200240 [2]江西理工大学电气工程与自动化学院,赣州341000

出　　处：《电工技术学报》2016年第4期178-186,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51177066;51377104)

摘　　要：不对称参数的同塔四回线具有不同的自感参数,无法使用传统的12序分量法进行解耦,因此采用相线解耦法对其进行解耦,并将相电流分解为12个独立的序电流分量,解决了同塔四回线中的互感耦合问题。线路发生故障时,利用故障边界条件得到序分量之间的关系。在不同回线上发生故障时,穿越序分量与环流序分量的序电流相位分别呈现出同相或反相的特征;同一回线发生不同类型故障时,序分量电流之间满足固定的幅值关系;同一类型的不同相序故障时,序分量相位差满足特定关系。考虑故障点分布系数对保护测量装置的影响,提出适于不对称参数同塔四回线发生单回线故障时的故障识别方法,并构造了相应的选相判据,给出了选相流程和方法。PSCAD/EMTDC仿真结果表明,此选相方法具有良好的选择性,不受故障类型,故障点的位置以及过渡电阻的影响。The asymmetrical quadruple-circuit lines have different self-inductances, which cannot be decoupled by the twelve-sequence-component method. Phase-Line decouple method is adopted to eliminate the mutual inductance, and convert the original phase currents into 12 different independent current components. When a line fault occurs, the boundary conditions help to find out the relationship between the current components. If a fault occurs on different lines, the across components and loop components are in the same or inverse phase. The amplitudes of the components are the same while the phases are shifted a special angle during the same kind of fault on the different phase of same line. Considering the influence of the distributed factors, a fault phase selection method for asymmetrical quadruple-circuit lines is presented, flow chart for fault phase is also provided. The PSCAD/EMTDC simulation results show that this method is suitable for fault phase selection, and the fault location and fault resistance has little influence on this method.

关 键 词：不对称参数 同塔四回线 选线 选相 序分量 单端电气量 

分 类 号：TM773[电气工程—电力系统及自动化]