Optimal construction of microgrids in a radial distribution system considering system reliability via proposing dominated group search optimization algorithm

•A new method is proposed for partitioning a large distribution system to several microgrids.•The aim is minimizing the amount of energy not supplied in order to improve the reliability.•Two kinds of failures are considered including distributed generators and busbar failures.•Optimal placement of e...

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Bibliographic Details
Published in:Sustainable energy technologies and assessments Vol. 63; p. 103622
Main Authors: Daryani, Narges, Zare, Kazem, Tohidi, Sajjad, Guerrero, Josep M., Bazmohammadi, Najmeh
Format: Journal Article
Language:English
Published: Elsevier Ltd 01.03.2024
Subjects:
Distributed generation
Dominated Group Search Optimization Algorithm
Energy storage system
Microgrid
Reliability
System partitioning
Dominated Group Search Optimization Algorithm
System partitioning
Distributed generation
Microgrid
Reliability
Energy storage system
ISSN:2213-1388
Online Access:Get full text
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Summary:•A new method is proposed for partitioning a large distribution system to several microgrids.•The aim is minimizing the amount of energy not supplied in order to improve the reliability.•Two kinds of failures are considered including distributed generators and busbar failures.•Optimal placement of energy storages is studied, resulting in better usage of generators.•Dominated Group Search Optimization algorithm is proposed and applied in this paper. In contemporary electrical networks, reliability stands as a paramount attribute. Since the introduction of distributed generation (DG) and microgrid (MG) concepts has considerably changed the structure of distribution networks, it is necessary to consider reliability aspects while going toward modern smart grids. This study introduces a novel methodology focusing on the partitioning of radial distribution systems into distinct MGs, strategically aimed at minimizing energy not supplied (ENS) to fortify overall system reliability. Two types of faults are considered including DG and busbar failures, and the impact of each kind of fault is investigated. Besides, a new Markov model is proposed to evaluate the reliability of DGs and MGs. Given the stochastic nature of the majority of DGs, the incorporation of energy storage systems (ESSs) can significantly enhance system performance. Therefore, this paper dedicates attention to exploring optimal ESS placement. To address the complex challenge of optimizing system partitioning, a modified version of the group search optimization (GSO) algorithm, named dominated GSO (DGSO) is proposed. The PG&E 69-bus distribution system is studied with two different structures to accurately investigate the effectiveness of the proposed partitioning approach on the system reliability. Moreover, the optimal number of MGs to be constructed within the intended system is determined.
ISSN:2213-1388
DOI:10.1016/j.seta.2024.103622