Hanif Rifai Adha, Yuni Rahmawati, Danang Arengga Wibowo, Putra Wisnu Agung Sucipto, Daeng Rahmatullah, Vanesya Ayu Wilujeng
The complexity of the power system due to the penetration of renewable energy, increased loads, and high reliability demands is a challenge in the case of transient stability. Critical Clearing Time (CCT) serves as a fundamental parameter in assessing system stability, representing the maximum allowable time to clear a disturbance before synchronization is lost. This paper introduces an area segmentation approach to optimize the placement of a combined Superconducting Fault Current Limiter (SFCL) and Super Capacitor Energy Storage (SCES) for improving CCT performance in multi-machine systems. The approach applied involves calculating each generator's Transient Stability Index (TSI) to identify critical areas that are vulnerable to system instability. The critical trajectory method is used to evaluate the CCT value more accurately and efficiently than conventional time domain simulations. A test system with an IEEE 6generator, 30-bus plan demonstrates the effectiveness of the proposed approach. TSI values are used as a reference in dividing the system based on the location or area most prone to loss of synchronization. In addition, it is a focus placement for SFCL and SCES placements. The scenario illustrates the optimal configuration, where the SFCL is placed on the channel near the generator and the SCES is located on the critical generator. The results obtained were an average CCT value of 3.87%, with the accuracy of the critical trajectory method reaching 0.829 s, compared to the time domain simulation in the time range of 0.82 ~s-0.83 ~s. Finally, the system can maintain the stability level during the interference period and improve the system's transient stability. © 2025 IEEE.
Universitas Negeri Malang, Department of Electrical Engineering and Informatics, Malang, Indonesia; Universitas Negeri Surabaya, Electrical Engineering, Surabaya, Indonesia
