半波长输电线路短路故障后的故障方向特性

发布时间：2018-06-09 20:33

本文选题：半波长 + 输电线路　；参考：《电网技术》2017年12期

【摘要】：半波长交流输电作为超远距离输电技术受到广泛关注。半波长交流输电线路的故障特征与传统输电线路不同,原有的方向元件应用到半波长交流输电线路时需要重新研究。通过理论推导和仿真分析,研究了半波长线路发生故障后,稳态工频量、故障突变量和故障行波量表征的故障方向特性。与常规输电线路相比,半波长线路反向故障时,稳态工频量(零序量)和故障突变量的电压电流相位差不再位于(45°,90°)之间。此外,用故障行波量表征半波长线路故障后的故障方向时,不能像常规输电线路一样采用几十上百kHz的频带,而应该用相对较低的频带。研究结果表明稳态工频量、故障突变量和故障行波量基本上仍可以表示半波长线路故障后的故障方向,不过在具体的故障方向特性上不同于常规输电线路,为方向元件应用于半波长输电线路奠定基础。
[Abstract]:Half-wavelength AC transmission as a super-long-distance transmission technology has received extensive attention. The fault characteristics of half-wavelength AC transmission lines are different from those of traditional transmission lines. The original directional elements need to be restudied when they are applied to half-wavelength AC transmission lines. Through theoretical derivation and simulation analysis, the fault direction characteristics of steady power frequency quantity, fault mutation quantity and fault traveling wave quantity after half-wavelength line failure are studied. Compared with conventional transmission lines, the voltage and current phase difference between steady state power frequency (zero sequence) and fault mutation is no longer between 45 掳and 90 掳. In addition, when the fault direction of half-wavelength transmission line is characterized by fault traveling wave quantity, the frequency band of hundreds of kHz should not be used as the conventional transmission line, but a relatively low frequency band should be used. The results show that the steady-state power frequency, fault mutation and fault traveling wave can still represent the fault direction of half-wavelength transmission line, but the characteristics of fault direction are different from those of conventional transmission line. It lays a foundation for the application of directional elements in half wavelength transmission lines.
【作者单位】：电力系统及发电设备控制和仿真国家重点实验室(清华大学电机系);
【基金】：国家重点研发计划项目(2016YFB0900600) 国家电网公司总部科技项目“半波长交流输电继电保护理论关键技术研究”~~
【分类号】：TM75

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