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Efficient Dimensionality Reduction of Directional Overcurrent Relays Optimal Coordination Problem

Authors: Fouad Salha , X. Guillaud


Directional over current relays (DOCR) are commonly used in power system protection as a primary protection in distribution and sub-transmission electrical systems and as a secondary protection in transmission systems. Coordination of protective relays is necessary to obtain selective tripping. In this paper, an approach for efficiency reduction of DOCRs nonlinear optimum coordination (OC) is proposed. This was achieved by modifying the objective function and relaxing several constraints depending on the four constraints classification, non-valid, redundant, pre-obtained and valid constraints. According to this classification, the far end fault effect on the objective function and constraints, and in consequently on relay operating time, was studied. The study was carried out, firstly by taking into account the near-end and far-end faults in DOCRs coordination problem formulation; and then faults very close to the primary relays (nearend faults). The optimal coordination (OC) was achieved by simultaneously optimizing all variables (TDS and Ip) in nonlinear environment by using of Genetic algorithm nonlinear programming techniques. The results application of the above two approaches on 6-bus and 26-bus system verify that the far-end faults consideration on OC problem formulation don-t lose the optimality.

Keywords: Genetic Algorithm, Nonlinear Programming, Backup/Primary relay, Coordination time interval (CTI), directional over current relays, time dial setting (TDS), pickup current setting (Ip)

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[1] D. Birla, R.P. Maheshwari, HariOmGupta "Time-overcurrent relay coordination: a review, International Journal of Emerging Electric Power Systems 2 (2) (2005).
[2] H. Askarian Abyaneh, M. Al-Dabbagh, H. Kazemi Karegar, S.H.H. Sadeghi, R.A. Jabbar Khan, "A new optimal approach for coordination of overcurrent relays in interconnected power systems" IEEE Transactions on Power Delivery 18 (April (2)) (2003).
[3] Li Yinhong, Shi Dongyuan, and Dum Xianzhong "A Study on Optimal Coordination of Definitetime Relay Based-on Genetic Algorithm" 0-7803-81 10-6/03/2003 IEEE
[4] R. E. Albrecht et al. ÔÇÿDigital Computer Protective Device Coordination program -Igeneral Program Description-, IEEE Trans on PAS, Vol. 83, No 4, April 1964, pp. 402-410.
[5] L. Jenkines, H. Khincha, S. Shivakumar and P. Dash. "An Application of Functional Dependencies to the Topological Analysis of Protection Schemes", IEEE Transaction on Power Delivery, Vol. 7, No. 1, January 1992, pp. 77-83.
[6] D. Vijayakumar, R. K. Nema "A Novel Optimal Setting for Directional over Current Relay Coordination using Particle Swarm Optimization" International Journal of Electrical Power and Energy Systems Engineering 1;4 ┬® Fall 2008
[7] J. Sadeh "Optimal Coordination of Overcurrent Relays in an Interconnected Power System" 15th PSCC, Liege, 22-26 August 2005.
[8] M. J. Damborg, et al. ÔÇÿComputer Aided Transmission Protection System Design, Part I: Algorithms-, IEEE Trans on PAS, Vol. 103, No 4, 1984.
[9] C. W. So, K. K. Li, K. T. Lai, and K. Y. Fung, "application of genetic algorithm for overcurrent relay coordination," in: Proc. 1997 IEE Conf.Developments in Power System Protection, pp. 66-69, 1997.
[10] C. W. So and K. K. Li, "Time coordination method for power system protection by evolutionary algorithm", IEEE Trans. on Industry Applications, vol. 36, no. 5, pp. 1235-1240,September-October 2000.
[11] D.Birla, R.P. Maheshwari, and H. O. Gupta, "A New Nonlinear Directional Overcurrent Relay Coordination Technique, and Banes and Boons of Near-End Faults Based Approach". IEEE transactions on power delivery, vol. 21, no. 3, july 2006 pittsburg,20-24-july 2008.
[12] H. A. Abyaneh, H. K. Karegar, A. Zahedi, M. Al-Dabbagh, and M. Ahamadi, "Constraints reduction of the optimal Coordination of Overcurrent relays," in Proc. Australian Universities Power Engineering Conf. (AUPEC), Melbourne, Australia,Sep.-Oct.29- 02,2002.
[13] F. Razavi, H. Askarian. Abyaneh, M. Al-Dabbagh, R. Mohammadi and H. Torkaman, "A new comprehensive genetic algorithm method for overcurrent relays coordination", Electr .PowerSyst.Res.May2007.
[14] H.K. Karegar, H. A. Abyaneh, V. Ohis, M. Meshkin "Pre-processing of the optimal coordination of overcurrent relays" Electric Power Systems Research 75 (2005) 134-141
[15] H.Saadat. "power system analysis". NewYork 1999.