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access icon free MOPSO/FDMT-based Pareto-optimal solution for coordination of overcurrent relays in interconnected networks and multi-DER microgrids

© The Institution of Engineering and Technology
Received 17/01/2018, Accepted 16/03/2018, Revised 10/03/2018, Published 22/03/2018

The minimisation of discrimination time between main and backup overcurrent (OC) relays is one of the most important issues in power system relays coordination. On account of the massive computation burden and complexities for determining power system breakpoint, the implementation of the previously reported OC protection methods in large interconnected networks is almost impossible or at least cumbersome. In this regard, a variety of optimisation algorithms have been presented for coordination between relays and finding optimal operation time (OT) of the protection system. The previously reported single-objective optimisation algorithms have some limitations/drawbacks regarding OT of relays and their coordination. In this study, a new multi-objective optimisation algorithm is presented for coordination of OC relays in interconnected networks, based on multi-objective particle swarm optimisation (MOPSO) and fuzzy decision-making tool (FDMT). Then, using some useful assumption and recommendations of IEC-6090 and fault calculations for the microgrids including distributed energy resources, the proposed method is generalised for OC relay coordination in microgrids. Finally, the proposed method has been successfully implemented on different test systems and the obtained results have been compared with other reported methods to prove accuracy, authenticity, and efficiency of the MOPSO/FDMT-based protection and relay coordination algorithm.

Inspec keywords: minimisation; power system interconnection; fuzzy set theory; decision making; relay protection; Pareto optimisation; power generation faults; overcurrent protection; distributed power generation; fault diagnosis; particle swarm optimisation

Other keywords: fault calculation; interconnected network; discrimination time minimisation; optimal operation time; multiobjective particle swarm optimisation algorithm; multiDER microgrid; power system relay coordination; MOPSO/FDMT-based Pareto-optimal solution; fuzzy decision-making tool; distributed energy resource; OT; overcurrent relay coordination algorithm; single-objective optimisation algorithm; OC relay coordination algorithm; IEC-6090 standard

Subjects: Protection apparatus; Power system management, operation and economics; Distributed power generation; Combinatorial mathematics; Optimisation techniques

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