@article { author = {Mahboubkhah, Afshin and Talavat, Vahid and Beiraghi, Mojtaba}, title = {Modified multi-objective PSO for coordination of directional overcurrent relays in interconnected networks}, journal = {Journal of Energy Management and Technology}, volume = {5}, number = {1}, pages = {43-50}, year = {2021}, publisher = {Iran Energy Association (IEA)}, issn = {2588-3372}, eissn = {2588-3372}, doi = {10.22109/jemt.2020.232092.1242}, abstract = {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.}, keywords = {MOPSO,optimization,Pareto-ranking,IEEE 30-bus network}, url = {https://www.jemat.org/article_111160.html}, eprint = {https://www.jemat.org/article_111160_4181f3b2816c8c8fdb118e069c0e7f17.pdf} }