CAJ | 학술논문

同塔双回直流线路极线间复杂的电磁耦合关系，增加了其故障极线识别的难度。基于平行四线系统解耦理论，对同塔双回直流线路电压量进行解耦分析，提取出相互独立的一个同向量与三个环流量电压。在此基础上详细分析了同塔双回直流输电线路在不同故障类型以及不同极线故障情况下的同向与环流电压突变量的极性和幅值大小特征，进而利用同向与环流电压突变量极性和幅值大小的差异及相互间的关联关系，提出了一种同塔双回直流输电线路故障选线方法。基于实际同塔双回直流输电系统的PSCAD/EMTDC大量仿真结果表明，该方法准确可靠，且不受过渡电阻影响。
동탑쌍회직류선로겁선간복잡적전자우합관계，증가료기고장겁선식별적난도。기우평행사선계통해우이론，대동탑쌍회직류선로전압량진행해우분석，제취출상호독립적일개동향량여삼개배류량전압。재차기출상상세분석료동탑쌍회직류수전선로재불동고장류형이급불동겁선고장정황하적동향여배류전압돌변량적겁성화폭치대소특정，진이이용동향여배류전압돌변량겁성화폭치대소적차이급상호간적관련관계，제출료일충동탑쌍회직류수전선로고장선선방법。기우실제동탑쌍회직류수전계통적PSCAD/EMTDC대량방진결과표명，해방법준학가고，차불수과도전조영향。
The complex electromagnetic coupling between polars of double-circuit HVDC transmission line increases the difficulty of fault line selection.According to the decoupling theory of four-parallel transmission lines on the same tower, the voltage variation of double-circuit HVDC transmission line is transformed into four separate voltage components: a ground mode component and three line mode components. Further, the transformation is employed to analyze the characteristics of ground mode component and line mode components of voltage variation under different kinds of fault. Thereby a method for fault line selection of double-circuit HVDC transmission line is proposed based on the amplitude and polarity of ground mode component and line mode components of voltage variation. Finally, the simulation results of a double-circuit HVDC system model based on PSCAD/EMTDC show that the proposed method is effective and immune to the fault resistance. This work is supported by National Natural Science Foundation of China (No. 51007024 and No. 51307065) and the Fundamental Research Funds for the Central Universities (No. 2013ZZ028).