Backup Overcurrent Relays Coordination with First and Second Zones Distance Relays in Power Systems

• Published in: International Multi-Conference on Systems, Signals, and Devices pp. 923 - 928
• Main Authors: Assouak, Asma, Benabid, Rabah
• Format: Conference Proceeding
• Language: English
• Published: IEEE 06.05.2022
• Subjects: directional overcurrent relays; distance relays; Fault location; mixed nonlinear optimization; Power system stability; power systems; Protective relaying; Renewable energy sources; Search problems; Software; Timing
• ISSN: 2474-0446
• DOI: 10.1109/SSD54932.2022.9955655

To ensure the reliability of the protection system, the combination of distance and directional overcurrent protection is an indispensable task, especially in interconnected power systems. This paper deals with setting and coordination of distance and directional overcurrent relays in interconnected power systems. As a backup to the main distance protection system, directional overcurrent relays are ensured. The problem is formulated as a mixed nonlinear optimization problem subject to coordination constraints. A Hybrid Particle Swarm Optimization with Gravitational Search Algorithm (PSO-GSA) is proposed and improved to solve the problem. The efficiency of the proposed approach is tested on the 9-bus considering two critical fault locations. For comparison purposes, three cases studies are proposed. The obtained results show good coordination of distance and overcurrent relays especially for the case where the relays characteristics and the time zone 2 are optimized with the classical relays parameters.