TY - JOUR ID - 111160 TI - Modified multi-objective PSO for coordination of directional overcurrent relays in interconnected networks JO - Journal of Energy Management and Technology JA - JEMT LA - en SN - AU - Mahboubkhah, Afshin AU - Talavat, Vahid AU - Beiraghi, Mojtaba AD - Department of Electrical Engineering, Urmia Branch, Islamic Azad University, Urmia, Iran Y1 - 2021 PY - 2021 VL - 5 IS - 1 SP - 43 EP - 50 KW - MOPSO KW - optimization KW - Pareto-ranking KW - IEEE 30-bus network DO - 10.22109/jemt.2020.232092.1242 N2 - Directional overcurrent relays are used to protect transmission lines against short circuits. Reducing the total operating time of relays has always been a challenge for protection engineers. For this purpose, various optimization algorithms have been introduced, some of which are based on multi-objective optimization. The objective functions of multi-objective algorithms must have the Pareto optimality property, which it’s ignoring is one of the drawbacks of previous studies. In this paper, new objective functions are proposed for a multi-objective optimization problem. To solve the optimization problem, the Multi-object PSO (MOPSO)algorithm is applied with small but effective changes to get the fastest settings of relays. These changes include a leader selection method, a removal method of repository surplus members, and a new velocity vector for particles based on the value of the objective function in the previous iteration. The proposed algorithm is evaluated in IEEE 30-bus network and compared with the standard MOPSO. There is also a comparison with the recent outstanding papers. The proposed method, compared to the 15 algorithms of other papers, results in the lowest total operating time of relays with a 7% reduction. UR - https://www.jemat.org/article_111160.html L1 - https://www.jemat.org/article_111160_4181f3b2816c8c8fdb118e069c0e7f17.pdf ER -