This article proposes a fault location algorithm for double-circuit transmission lines compensated by a generalized unified power flow controller (GUPFC) in the phasor analysis domain. The suggested algorithm is able to locate the fault point in three stages at each circuit of a double-circuit line equipped with a GUPFC between two terminals. The first stage determines the faulty section with respect to the location of the GUPFC using the positive sequence voltages of two terminals of the line. In the second stage, the faulty circuit among the circuits of the double-circuit line is identified through analysis of sequence components of the line currents at the terminals. After determining the faulty section and faulty circuit of the line, the fault location is calculated at the third stage with high accuracy based on the analysis of synchronous current and voltage phasors that rule the circuitry equations in the GUPFC compensated double-circuit transmission line. Finally, the equations required for determining the fault location for 11 types of faults in these lines are presented based on the distributed parameter model of the line in sequence components considering the coupling between the two lines. The considered GUPFC, based on the detailed model method, is modeled along with the test network in MATLAB/Simulink. Moreover, the presented algorithm is programmed in MATLAB software for evaluation and test. The obtained simulation results verify the accurate performance of the presented algorithm under different fault conditions.

中文翻译：

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基于同步电流电压相量的广义统一潮流控制器(GUPFC)补偿的双回输电线路故障测距

本文提出了一种相量分析域中由广义统一潮流控制器（GUPFC）补偿的双回输电线路故障定位算法。建议的算法能够在两个终端之间配备 GUPFC 的双回线路的每条线路上分三个阶段定位故障点。第一阶段使用线路两端的正序电压确定相对于 GUPFC 位置的故障部分。第二阶段，通过分析终端线路电流的序分量，确定双回线路线路中的故障线路。确定线路故障断面和故障线路后，基于 GUPFC 补偿双回输电线路中控制电路方程的同步电流和电压相量的分析，在第三阶段高精度地计算故障位置。最后，基于考虑两条线路之间耦合的线路序分量分布参数模型，给出了确定这些线路中11种故障位置所需的方程。所考虑的 GUPFC，基于详细的模型方法，在 MATLAB/Simulink 中与测试网络一起建模。此外，所提出的算法是在MATLAB软件中编程的，用于评估和测试。得到的仿真结果验证了所提出算法在不同故障条件下的准确性能。