Optimal Coordination of Directional Overcurrent Protection Relays Using Genetic Algorithm

Authors

Corressponding author's email:

ngominhkhoa@qnu.edu.vn

DOI:

https://doi.org/10.54644/jte.2024.1706

Keywords:

Coordination time, Directional overcurrent relay, Genetic algorithm, Inverse-time characteristics, Transmission network

Abstract

This paper studies on establishing the mathematical optimization formulation to coordinate the operating times of directional overcurrent relays in transmission networks. The objective function of this optimization formulation is to minimize the total operation time of all directional overcurrent relays, and it must satisfy the highly nonlinear constraints such as the time multiplier setting range, the plug setting range, and the coordination time interval between the primary and backup relay pair. The optimal variables consist of the time multiplier setting and the plug setting which are determined by applying the genetic algorithm on MATLAB software. This optimization formulation is evaluated and validated via the simulation results of the test systems including the 4-bus network and 9-bus network. These test systems are modeled and simulated by using PowerWorld software to calculate the power flow results in the steady state and the short-circuit currents flowing the primary/backup relay pair. The simulation results confirm that the operating time coordination of directional overcurrent relays is capable of meeting the requirements of a relay protection system, improving the reliability of power system.

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Author Biographies

Minh Khoa Ngo, Quy Nhon University, Vietnam

Ngo Minh Khoa was born in 1983 in Binh Dinh province, Vietnam. He received the B.Sc., M.Sc., and Ph.D. degrees in Electrical Engineering from University of Science and Technology, The University of Danang, Danang City, Vietnam, in 2006, 2010, and 2017, respectively. He became an associate professor in January 2024. He joined Quy Nhon University, Quy Nhon city, Vietnam in 2006, where he is currently a senior lecturer at Faculty of Engineering and Technology. His research interests include power quality, fault location, smart grid, and power system stability.

Email: ngominhkhoa@qnu.edu.vn. ORCID:  https://orcid.org/0000-0003-3104-1692

Van Trong Huynh, Quy Nhon University, Vietnam

Huynh Van Trong was born in 2003 in Binh Dinh province, Vietnam. He is currently a fourth-year student of Faculty of Engineering and Technology, Quy Nhon University, Vietnam, whose major is Electrical Engineering. His engrossed research is renewable energy and relay protection.

Email: huynhvantrong198@gmail.com. ORCID:  https://orcid.org/0009-0003-5002-6778

Hoang Long Vo, Quy Nhon University, Vietnam

Vo Hoang Long was born in 2003 in Binh Dinh province, Vietnam. He is currently a fourth-year student of Faculty of Engineering and Technology, Quy Nhon University, Vietnam, whose major is Electrical Engineering. His engrossed research is renewable energy and relay protection.

Email: vohoanglongts77@gmail.com. ORCID:  https://orcid.org/0009-0001-5742-4539

Thi Nha Han Pham, Quy Nhon University, Vietnam

Pham Thi Nha Han was born in 2003 in Phu Yen province, Vietnam. She is currently a fourth-year student of Faculty of Engineering and Technology, Quy Nhon University, Vietnam, whose major is Electrical Engineering. Her engrossed research is relay protection, power system reliability.

Email: nhahanpy2003@gmail.com. ORCID:  https://orcid.org/0009-0006-0326-4839

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Published

28-12-2024

How to Cite

[1]
M. K. Ngo, V. T. Huynh, H. L. Vo, and T. N. H. Pham, “Optimal Coordination of Directional Overcurrent Protection Relays Using Genetic Algorithm”, JTE, vol. 19, no. 06, pp. 75–83, Dec. 2024.

Issue

Vol. 19 No. 06 (2024)

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Research Article

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