Mobile QR Code QR CODE : The Transactions of the Korean Institute of Electrical Engineers
Title A Study on the Optimization Over-current Relay Setting Value Considering the Effect of a High Penetration Rate of Distributed Generation on Distribution Protection System
Authors 오형진(Hyung-Jin Oh) ; 김지수(Ji-Soo Kim) ; 강민재(Min-Jae Kang) ; 이 마데 두위 달만타라(I Made Dwi Darmantara) ; 김철환(Chul-Hwan Kim)
DOI https://doi.org/10.5370/KIEE.2021.70.6.852
Page pp.852-859
ISSN 1975-8359
Keywords Distributed Generation; Hosting Capacity; Overcurrent Relay; Optimize; Protection Blinding; Protection System; Sympathetic Tripping; Time Dial Setting
Abstract Recently, the research on hosting capacity (HC) calculation has become important due to the high interconnection of Renewable Energy Sources (RESs). The existing research on the maximum HC calculation is mainly focused on power quality. However, if the distributed generation is connected based on the HC calculation, there is a risk that the protection system could be affected and create some problems such as Sympathetic Tripping and Protection Blinding (protection device malfunction). Although this problem can be overcome by changing the relay correction value, the problems might still occur due to the limitation of the protection device setting. Therefore to solve this problem, an algorithm that can simultaneously optimize the Time Dial Setting of the overcurrent relay and the HC of the distributed generation without causing a protection system problem is proposed in this paper.
The proposed algorithm was optimized through the most widely used genetic algorithm (GA), and the simulation was done using MATLAB and DigSLINET PowerFactory. The simulation was tested in IEE 37 bus system and from the simulation, the optimal overcurrent relay setting and HC value are obtained.