特高压输电线路保护故障测距的应用研究  

Application research of fault location of UHV transmission line protection

作　　者：王伟[1] 余锐[1] 陈愚[1] 王立平[1,2] 刘星 樊占峰 倪传坤 

机构地区：[1]四川电力调度中心,四川成都610041 [2]西南交通大学电气工程学院,四川成都610031 [3]许继集团,河南许昌461000

出　　处：《电力系统保护与控制》2013年第19期40-46,共7页Power System Protection and Control

摘　　要：皖电东送淮南至上海特高压交流输电示范工程中采用双回线同杆并架工程方案。同杆并架双回线由于存在线间互感,导致线路保护中阶段式距离保护在阻抗测量方面存在问题,实际应用中可采用缩短保护范围的定值整定方法。但基于单回线测量阻抗原理的常规输电线路故障测距同样受互感的影响,特高压输电线路在故障时非常严重的暂态过程会给故障测距带来较大误差。建模仿真分析了线间互感及特高压输电线路的暂态过程对常规故障测距的影响,提出采用基于负序故障分量的分布参数双端测距原理的总体实现方案,从工程应用的角度出发测距方案采用单回线的信息,方案考虑特高压输电线路故障特征及满足故障测距原理的需要,提出基于"海明窗"级联式数字滤波器的故障测距算法,通过RTDS/Matlab建立皖电东送特高压输电线路仿真模型。仿真结果表明,所提出的测距方案不受同杆互感的影响、不受过渡电阻的影响,有效克服了特高压输电线路故障时暂态过程对测距算法的影响。The parallel double circuit lines on the same tower engineering scheme is adopted by Anhui Electricity Eastward Transmitting Shanghai-Huainan UHV AC transmission demonstration project. The mutual inductance exists between lines of double circuits, which leads to the impedance measurement problem of stage type distance protection. In practical application it can be solved by shortening the protection range in fixed value setting method. Common transmission line fault location based on single loop measuring impedance principle is also influenced by mutual inductance, and fault location results will produce a bigger error caused by severe transient process when UHV transmission line fault occurs. This paper analyzes the influence of coupled inductance and transient process of UHV transmission lines on conventional fault location by modeling simulation, puts forward an overall implementation scheme of distribution parameter double-end fault location principle based on negative-sequence fault component. From engineering application perspective, single loop information is adopted in fault location scheme, and considering fault characteristics of UHV transmission line and the demand of fault location principle, a fault location algorithm based on Haiming window cascading digital filter is put forward. The simulation model of ＂Anhui Electricity Eastward Transmitting＂ UHV transmission line is established through RTDS/MATLAB, the simulation results show that the proposed scheme is not influenced by mutual inductance of the same tower and interim resistance, and effectively avoids the influence of the transient process of UHV transmission line fault on fault location.

关 键 词：特高压 负序故障分量 故障测距 数字滤波器 海明窗 

分 类 号：TM773[电气工程—电力系统及自动化]