Thyristor controlled series capacitor (TCSC) is placed in transmission line to enhance its power transfer capability. However, several relaying methods experience the challenges of voltage and current inversion, nonlinear behavior of MOV and sub-synchronous oscillations in the presence of TCSC. Furthermore, power swing causes unwanted trip and severely affects the protection schemes due to the modulation of relaying signals for a TCSC-compensated line. Even, fault detection is not possible due to power swing blocking (PSB) element which blocks distance relay when impedance trajectory lies inside the relay trip zone. To overcome the problem associated with TCSC and PSB operation within the duration of power swing, a fault identification technique, based on multiplication of Teager Kaiser Energy Operators (TKEOs) of negative sequence (NS) current and voltage phasors, is proposed. It has been tested in numerous fault cases in various system conditions and compared with the existing schemes. The proposed technique can be implemented with a threshold which is a major advantage of it. Availability of local end relay voltage and current data make the scheme reliable and fast. To validate the proposed scheme, a WSCC 9-bus system with consideration of 400 kV, 50 Hz has been simulated and tested using EMTDC/PSCAD software.

晶闸管控制串联电容器 (TCSC) 放置在输电线路中以增强其功率传输能力。然而，几种中继方法遇到了电压和电流反转、MOV 的非线性行为以及存在 TCSC 时的次同步振荡的挑战。此外，由于 TCSC 补偿线路的中继信号调制，功率摆动会导致意外跳闸并严重影响保护方案。甚至，当阻抗轨迹位于继电器跳闸区域内时，由于功率振荡闭锁 (PSB) 元件会阻塞距离继电器，因此无法进行故障检测。为了克服在电力摆动期间与 TCSC 和 PSB 操作相关的问题，一种故障识别技术，提出了基于负序 (NS) 电流和电压相量的 Teager Kaiser 能量算子 (TKEO) 的乘法。在各种系统条件下的大量故障案例中进行了测试，并与现有方案进行了比较。所提出的技术可以用一个阈值来实现，这是它的一个主要优点。本地端继电器电压和电流数据的可用性使该方案可靠且快速。为了验证所提出的方案，使用 EMTDC/PSCAD 软件模拟和测试了考虑 400 kV、50 Hz 的 WSCC 9 总线系统。本地端继电器电压和电流数据的可用性使该方案可靠且快速。为了验证所提出的方案，使用 EMTDC/PSCAD 软件模拟和测试了考虑 400 kV、50 Hz 的 WSCC 9 总线系统。本地端继电器电压和电流数据的可用性使该方案可靠且快速。为了验证所提出的方案，使用 EMTDC/PSCAD 软件模拟和测试了考虑 400 kV、50 Hz 的 WSCC 9 总线系统。