The use of devices based on power electronics has been widely spread to improve the transmission lines performance. However, the inclusion of these compensators, named Flexible AC Transmission Systems, produces adverse effects on conventional protection schemes. For instance, it modifies the apparent impedance of transmission lines. This condition produces malfunction in conventional distance protection. This paper presents an algorithm protection for power transmission lines, compensated with a Thyristor-Controlled Series Capacitor. The proposed algorithm is capable of discriminating the directionality of traveling waves as well as detecting and locating eleven types of faults. The impact of the Thyristor-Controlled Series Capacitor device in the directionality of traveling waves is analyzed and separated for developing the protection. The obtained results show that the directionality of the algorithm is not affected by the presence of Thyristor-Controlled Series Capacitor. In order to validate the algorithm, several study cases are considered. The error calculating distance to fault is smaller than 1.25%

中文翻译：

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TCSC对行波方向性在输电线路中定位故障的影响

基于电力电子设备的设备的使用已经广泛传播，以提高传输线的性能。但是，将这些补偿器（称为柔性交流传输系统）包括在内会对常规保护方案产生不利影响。例如，它修改了传输线的视在阻抗。这种情况会在常规距离保护中产生故障。本文提出了一种由晶闸管控制的串联电容器补偿的电力传输线保护算法。所提出的算法能够判别行波的方向性，并能够检测和定位十一种类型的故障。分析并分离了晶闸管控制的串联电容器器件对行波方向性的影响，以建立保护措施。获得的结果表明，该算法的方向性不受晶闸管控制串联电容器的存在的影响。为了验证算法，考虑了几个研究案例。到故障的误差计算距离小于1.25％