Highly sensitive microgrid protection using overcurrent relays with a novel relay characteristic

Darabi, Ahmad; Bagheri, Mehdi; Gharehpetian, Gevork B.

doi:10.1049/iet-rpg.2019.0793

Cited by 45 publications

(30 citation statements)

References 57 publications

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“…Moreover, to overcome the protection constraints for high penetrated DGs, the author has proposed a new OCR curve. A robust combinatorial optimization method implemented in [170] to solve the coordination problem using a new characteristic relay. A novel approach based on Rosen Gradient projection Differential evolution (RGP-DE) [171] optimizes the parameters iteratively based on measured voltages available at relay location and currents until the solution is converged.…”

Section: B: Meta-heuristic Optimization Techniquesmentioning

confidence: 99%

A Comprehensive Review on Protection Strategies to Mitigate the Impact of Renewable Energy Sources on Interconnected Distribution Networks

et al. 2021

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Technology advancement in the last few decades allows large penetration of renewable energy resources in the distribution network (DN). The integration of such resources has shown a substantial impact on DN through power loss reduction and improved network reliability. Besides this, the existing protection system has encountered coordination challenges due to the bidirectional power flow, different types and capacity of generation sources, and changes in fault levels due to network operating modes (grid-connected or islanded). Such conditions may cause the relays to malfunction and imperil the effectiveness of the existing protection scheme. Therefore, an efficient and robust protection coordination scheme is imperative to avoid network reliability and stability issues to the grid. This review paper presents a comparative analysis of various protection techniques implemented to alleviate the impact of integrated resources into DN. Moreover, a comparison of classical and modified protection approaches in terms of advantages, shortcomings, and implementation costs is presented. The prime objective of this study is to highlight the prominence of utilizing user-defined programmable relays for modern DNs. Moreover, recommendations are presented by considering the application of user-defined relay characteristics that can be proved as a robust protection scheme to cope with the protection challenges in existing and future power systems developments.INDEX TERMS Distribution networks (DN), microgrids (MG), protection coordination scheme, renewable energy resources (RES), user-defined characteristics (UDC).

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Section: B: Meta-heuristic Optimization Techniquesmentioning

confidence: 99%

A Comprehensive Review on Protection Strategies to Mitigate the Impact of Renewable Energy Sources on Interconnected Distribution Networks

et al. 2021

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“…In [20] a three-stage communication assisted selectivity scheme was suggested. Moreover, an overcurrent relay characteristic for reducing the operating time of the overcurrent relay was proposed in [21]. Zamani and et al in [22] used zero (0) and negative (-) sequence components of currents in the proposed protection scheme.…”

Section: Protective Strategy-based Schemesmentioning

confidence: 99%

A New Impedance-Based Main and Backup Protection Scheme for Active Distribution Lines in AC Microgrids

2021

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Microgrids active characteristics such as grid-connected or islanded operation mode, the distributed generators with an intermittent nature, and bidirectional power flow in active distribution lines lead to malfunction of traditional protection schemes. In this article, an impedance-based fault detection scheme is proposed as the main protection of microgrids by applying the proposed equivalent circuits for doubly-fed lines. In this scheme, relay location data and positive sequence voltage absolute value of the other end of the line are used. It can detect even high impedance faults in grid-connected and islanded modes. It is robust against load and generation uncertainties and network reconfigurations. Low sampling rate and minimum data exchange are among the advantages of the proposed scheme. Moreover, a backup protection scheme based on the conductance variations is suggested. No requirement for the communication link is a distinguished advantage of the proposed backup protection scheme. The proposed schemes have been simulated using PSCAD and MATLAB software and the results confirmed their validity.

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“…The application of time overcurrent relays in MGs has limitations in terms of sensitivity [18]. Highly dynamic load conditions combined with minimal faults owing to the distributed energy resources (DERs) compromise fault detection; a lack of sensitivity can be very common in these networks [19].…”

Section: A Literature Reviewmentioning

confidence: 99%

New Overcurrent Relay Coordination Method Through Time Intervals to Enhance Microgrid Protection

Gonzalez

Enrı́quez

2021

IEEE Access

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This paper presents a method to protect microgrids (MGs) through coordination of directional overcurrent relays (DOCRs). The new formulation is subjected to restrictions of pre-established time intervals to guarantee the primary and backup functions of each relay. This coordination criterion has advantages over the conventional coordination because functional independence between the relays is achieved. It is only necessary to update the setting in the relays affected by contingencies, topological changes, or during the formation of islands. The use of non-conventional curves is considered to give the flexibility necessary to meet the time intervals at each required location. Based on the results, the proposed coordination method reduces the operation time of the relays compared with that under the conventional coordination method in the power systems studied. Further simplification in the relay adjustment process under the different contingencies studied was obtained, which improved under the various operating conditions in the test systems.

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Highly sensitive microgrid protection using overcurrent relays with a novel relay characteristic

Cited by 45 publications

References 57 publications

A Comprehensive Review on Protection Strategies to Mitigate the Impact of Renewable Energy Sources on Interconnected Distribution Networks

A Comprehensive Review on Protection Strategies to Mitigate the Impact of Renewable Energy Sources on Interconnected Distribution Networks

A New Impedance-Based Main and Backup Protection Scheme for Active Distribution Lines in AC Microgrids

New Overcurrent Relay Coordination Method Through Time Intervals to Enhance Microgrid Protection

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