Shahid Beheshti University International Journal of Research and Technology in Electrical Industry 2821-0190 3 2 2024 07 01 Precise Hybrid Method for Solving the Selectivity Problem of Overcurrent Relays due to PV Uncertainty 360 370 105050 10.48308/ijrtei.2024.236129.1049 EN Faeze Mohajer Electrical Engineering Department, Faculty of Engineering, Shahid Beheshti University, Tehran, Iran 0009-0003-3354-2711 Hossein Kazemi Kargar Electrical Engineering Department, Faculty of Engineering, Shahid Beheshti University, Tehran, Iran 0000-0001-7392-3453 Ahmad Salemnia Electrical Engineering Department, Faculty of Engineering, Shahid Beheshti University, Tehran, Iran 0000-0001-9892-1331 Javad Sadeh Department of Electrical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran Journal Article 2024 06 27 Photovoltaic (PV) power plants include several parallel and series units. PV uncertainty due to scheduled or forced outages of these units affects the coordination of overcurrent relays (OCRs) and may violate the optimization constraint. This paper proposes a novel hybrid method to solve the selectivity problem of overcurrent relays due to photovoltaic power plant uncertainty. The proposed technique exploits K-medoids and interval linear programming (ILP) to provide setting groups (SGs). The recommended method not only maintains relay coordination for all PV generation scenarios, but also optimizes their operating time. In addition, this method can also be applied to the uncertainties caused by the synchronous distribution generation (DG) unit, which is verified in the studied networks. This research has been tested on the IEEE 8-bus and IEEE 30-bus distribution systems and the superiority of the proposed method in solving the selectivity problem and relay trip time optimization is demonstrated by the simulation results. https://ijrtei.sbu.ac.ir/article_105050_5bb64479700eacdbc41a38bae65286f4.pdf