Two Approaches for Directional Overcurrent Relays Coordination in Interconnected Power Systems with Distributed Generation

Citation:
Mostafa, S. A. E. A., D. K. Ibrahim, and E. E. - D. A. El-Zahab, "Two Approaches for Directional Overcurrent Relays Coordination in Interconnected Power Systems with Distributed Generation", Proceedings of the 8th International Conference on Electrical Engineering, ICEENG Conference, Military Technical College, Cairo, Egypt, 29-31 May, 2012., 2012.

Abstract:

Connection of distributed generation (DGs) powered by renewable energy resources in power systems has numerous benefits. However the presence of these (DGs) increase the fault current levels in different points, and disturb the protection coordination of the existing relays. Two approaches are proposed for coordination of directional overcurrent relays (DOCRs) in power systems with (DGs), depending on the types of system relays either adaptive or non adaptive. For adaptive protection system, the first proposed approach is based on linear programming technique which used to calculate the relay settings in case of DGs existing or not. For non-adaptive protection system, the second proposed approach is introduced, in which minimum impedance of fault current limiter is calculated to restore the coordination of relays without altering the original relay settings. The two proposed approaches are implemented and tested on IEEE-39 bus test system.

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