Restoration of Directional Overcurrent Relay Coordination in Distributed Generation Systems Utilizing Fault Current Limiter
ABSTRACT A new approach is proposed to solve the directional overcurrent relay coordination problem, which arises from installing distributed generation (DG) in looped power delivery systems (PDS). This approach involves the implementation of a fault current limiter (FCL) to locally limit the DG fault current, and thus restore the original relay coordination. The proposed restoration approach is carried out without altering the original relay settings or disconnecting DGs from PDSs during fault. Therefore, it is applicable to both the current practice of disconnecting DGs from PDSs, and the emergent trend of keeping DGs in PDSs during fault. The process of selecting FCL impedance type (inductive or resistive) and its minimum value is illustrated. Three scenarios are discussed: no DG, the implementation of DG with FCL and without FCL. Various simulations are carried out for both single- and multi-DG existence, and different DG and fault locations. The obtained results are reported and discussed.
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Conference Paper: Impact of DG location on protection coordination in distribution systems[Show abstract] [Hide abstract]
ABSTRACT: Recent developments have once again directed the public interest to small scale and local generation of electricity. Environmental Problems, Reliability and Electrical Market are typical reasons for this revision. Injection of DGs currents to a distribution network results in loosing radial structure and also increasing fault current level. It causes the protection issues like unwanted tripping, protection blinding and mal-operation of fuses. The severity of protection influence of distributed generations depends on the type, location and the size of DGs. In this paper a novel method has been presented for quantizing the dependence of protection problem to DG's location. This method can also specify the location with the least protection problems for DG installation. Genetic algorithm is employed for this search and specification and the proposed method has been run for a real network with implementation of DIgSILENT Power Language (DPL).Electrical Power Distribution Networks (EPDC), 2012 Proceedings of 17th Conference on; 01/2012
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ABSTRACT: In this paper, a novel protection coordination optimization algorithm is proposed. The purpose is to maximize the disperse generation penetration and, at the same time, to minimize the operating time of fuses. A novel optimization technique, the Imperialistic Competition Algorithm (ICA), is applied to solve the problem. The results of simulations confirm that the proposed method leads to lower operating times of protective devices and higher possible DG penetration, compared with the traditional coordination techniques.MAJLESI JOURNAL OF ELECTRICAL ENGINEERING. 09/2014; 8(3).
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ABSTRACT: Connection of distributed generation resources in distribution system enhances the availability and reliability of electric power during peak load. However, increasing penetration of distributed generation resources causes protection coordination failure in distribution system. An optimization problem is proposed to determine relay coordination under maximum penetration level of distributed generation by optimally selecting location, parameters and size of distributed generation. The proposed optimization problem is implemented on IEEE 15 node radial system. A meta-heuristic approach based on covariance matrix adaptation evolution strategy directed target to best perturbation algorithm is applied for optimization of relay coordination problem under maximum penetration of distributed generation.Swarm Intelligence (SIS), 2013 IEEE Symposium on; 01/2013