Optimal Coordination of Overcurrent Relays Considering Generators Transient Currents

Document Type : Original Article

Authors

Faculty of Electrical and Computer Engineering, University of Shahid Beheshti, Tehran, Iran

Abstract

Short-circuit current in the power networks, consists of steady and transient states. In the conventional relay coordination method, the transient component of short-circuit current is ignored and the relays are coordinated via fixed currents. The transient component of short-circuit currents causes relays operate fast and thus miscoordinations appear between the main and backup pair relays. In this paper, a relay coordination method considering the transient component of short-circuit current is presented. Dynamic model of inverse time overcurrent relay is used to calculate operating time of relays. In the proposed method, both TSM and Ip < /sub> of relays are calculated considering coordination constraints. It is shown that when the Ip < /sub> is entered to the optimization problem, the objective function is reduced but miscoordinations between relays are increased because of the transient component of short-circuit current. Genetic optimization algorithm is used for relays coordination. The proposed coordination method is implemented on a radial and a meshed network, and the results are compared with the conventional method of coordination.

Keywords

References

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TABRIZ JOURNAL OF ELECTRICAL ENGINEERING
Volume 49, Issue 3 - Serial Number 89
December 2019
Pages 1249-1258

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