Abstract

Distributed, generation-based micro-grids are increasingly being used in the build-up of the modern power system. However, the protection of these micro-grids has many challenges. One of the important challenges is the coordination of directional overcurrent (DOC) relays. The optimization of the coordination of DOC relays is considered a nonlinear programming problem with pre-defined constrains. In this paper, the problem of the optimal coordination of DOC relays is solved using a multi-verse optimization (MVO) algorithm which is inspired from cosmology science. The proposed algorithm is tested by applying it to Institute of Electrical and Electronics Engineers (IEEE) 3 bus and IEEE 9 bus networks. The performance of the proposed algorithm is compared with the particle swarm optimization (PSO) algorithm when applied to both networks. All results show that the performance of the MVO algorithm is better than PSO in terms of its reduction of both the overall operating time (OT) of DOC relays and the computational burden of the computer solving the optimization problem.

Highlights

  • The power system protection of micro-grids must have one main feature, which is the selectivity.For this purpose, the directional overcurrent (DOC) relays are intensively incorporated in the protection of micro-grids since they measure both the magnitude and direction of the phase current to reassure that the fault is occurring within the intended protection zone [1,2]

  • All results show that the performance of the multi-verse optimization (MVO) algorithm is better than particle swarm optimization (PSO) in terms of its reduction of both the overall operating time (OT) of DOC relays and the computational burden of the computer solving the optimization problem

  • The DOC relays are intensively incorporated in the protection of micro-grids since they measure both the magnitude and direction of the phase current to reassure that the fault is occurring within the intended protection zone [1,2]

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Summary

Introduction

The power system protection of micro-grids must have one main feature, which is the selectivity. This algorithm has a clear disadvantage, which is the dependability on the constructive method has been proposed by many research papers to solve the DOC relays coordination problem cooperation rather than keeping track on each search member separately to find the fittest one [12]. Another important algorithm is[22].

Formulation of the Objective Function
Constraints of the Optimization Problem
Basic Idea and Inspiration of MVO
Mathematical Model of MVO Algorithm
The Proposed Optimal Coordination Algorithm of DOC Relays
Results
Conclusions

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