Abstract Fault detection during power swing in compensated transmission lines by Thyristor Controlled Series Capacitors (TCSCs) is a challenging problem and conventional detection methods might not be accurate. In this paper, a high speed fault detection approach based on Mathematical Morphology is proposed. The proposed method uses voltage and current signals for fault and swing detections, respectively. The performance of the proposed method is evaluated using two simulation case studies simulated in PSCAD/EMTDC: (i) a single machine infinite bus network and (ii) IEEE standard 9 bus three machine network. It is shown that the proposed approach is not sensitive to nonlinear behavior of TCSCs and it is capable of detecting all types of faults, including three-phase ones, during power swing accurately. In addition, due to low computational complexity, the proposed method provides significantly high detection speed.

中文翻译：

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晶闸管控制串联电容补偿输电线路功率摆幅故障检测

摘要 晶闸管控制串联电容器 (TCSC) 补偿输电线路功率摆动期间的故障检测是一个具有挑战性的问题，传统的检测方法可能不准确。本文提出了一种基于数学形态学的高速故障检测方法。所提出的方法分别使用电压和电流信号进行故障和摆动检测。使用在 PSCAD/EMTDC 中模拟的两个模拟案例研究来评估所提出方法的性能：（i）单机无限总线网络和（ii）IEEE 标准 9 总线三机网络。结果表明，所提出的方法对 TCSC 的非线性行为不敏感，并且能够准确检测电力摆幅期间的所有类型的故障，包括三相故障。此外，