An adaptive protection coordination strategy utilizing user-defined characteristics of DOCRs in a microgrid

Tripathi, Jayant Mani; Mallik, Sanjeev Kumar

doi:10.1016/j.epsr.2022.108900

Cited by 19 publications

(5 citation statements)

References 32 publications

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“…Consequently, in the proposed approach, both 𝐴 and 𝐵 are treated as variables, offering enhanced flexibility within digital DOCRs. This enables the operation of DOCRs with a wide range of characteristics, surpassing the conventional ones [23]. It is clear from Fig.…”

Section: A User-defined Docr Characteristicsmentioning

confidence: 92%

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Stability-Constrained Settings of Directional Overcurrent Relays With Shifted User-Defined Characteristics for Distribution Networks With DERs

Sheta,

Sedhom,

Pal

et al. 2024

IEEE Trans. Power Delivery

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Abstract-Microgrids (MGs) with distributed energy resources (DERs) offer multiple advantages in terms of energy efficiency, reliability, and sustainability. However, due to the changes DERs bring to the fault currents, ensuring protection for DER-rich distribution grids is more challenging than conventional grids. This paper investigates the implementation of directional overcurrent relays (DOCRs) in MGs, considering the transient stability of the DERs. Given the low inertia of the DERs, the high operating times of DOCRs can potentially impede DERs' stability, even at post-fault. As such, this paper proposes a novel approach using shifted user-defined characteristics of DOCRs that employs two inverse curves to maintain both relay-relay coordination as well as DERs' stability. Then, the critical clearing times of DERs are combined with the coordination constraints to determine DOCR's optimal settings using genetic algorithm. The proposed methodology is evaluated using the modified IEEE 33bus test system equipped with four synchronous-based DERs. DigSILENT and MATLAB are used to simulate the system, solve the optimization problem, and analyze transient stability. The results indicate the superior performance by the proposed characteristics in comparison with single characteristic to meet both relay coordination and DERs' stability requirements.

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Section: A User-defined Docr Characteristicsmentioning

confidence: 92%

“…In this study, the range of 𝐴 𝑖 is defined as [0.14, 80], representing the lower limit 𝐴 𝑖,𝑚𝑖𝑛 and upper limit 𝐴 𝑖,𝑚𝑎𝑥 . Similarly, the range of 𝐵 𝑖 is considered as [0.02, 2], representing the lower limit 𝐵 𝑖,𝑚𝑖𝑛 and upper limit 𝐵 𝑖,𝑚𝑎𝑥 [23].…”

Section: A User-defined Docr Characteristicsmentioning

confidence: 99%

Stability-Constrained Settings of Directional Overcurrent Relays With Shifted User-Defined Characteristics for Distribution Networks With DERs

Sheta,

Sedhom,

Pal

et al. 2024

IEEE Trans. Power Delivery

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“…This allows the relays to be coordinated more effectively, with increased flexibility and improved reliability [203], [204]. In [205], the authors introduced a novel user-defined adaptive relay coordination strategy for both near-end and far-end faults in a power line. The proposed scheme employs user-defined four-setting numerical DOCRs for grid-connected microgrid operation on IEEE 6, modified 14-bus, and IEEE 30-bus test systems.…”

Section: Optimization Algorithms For Docrs Coordination Problemmentioning

confidence: 99%

Optimization Techniques for Directional Overcurrent Relay Coordination: A Comprehensive Review

Foqha,

Alsadi,

Omari

et al. 2024

IEEE Access

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This paper provides a comprehensive review of optimization techniques for coordinating directional overcurrent relays in power systems. It covers a wide range of techniques, including conventional and deterministic methods, metaheuristic algorithms, and hybrid approaches. The paper discusses the objective functions utilized in formulating relay coordination problem and presents the development of optimization methods for solving this problem. Furthermore, it examines the criteria for comparing different algorithms for coordination problem and includes a case study to demonstrate the practical application of these criteria. It also presents simulation software employed for examining and validating results obtained from optimization algorithms. Future trends and challenges regarding optimal coordination of directional overcurrent relays are also discussed. The paper concludes that there is no single "best" optimization technique for the coordination problem. The best technique for a particular application will depend on the specific characteristics of the power system and the constraints of the coordination problem.

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“…For designing any optimization algorithm, initially the objective function for the network is framed in such a way to minimize the operating time of relays. [11,[45][46][47][48]. For designing any optimization algorithm, the following procedures are to be carried out.…”

Section: Literature Surveymentioning

confidence: 99%

An Adaptive Centralized Protection and Relay Coordination Algorithm for Microgrid

Kannaian,

Joseph,

Ramachandran

2023

Energies

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To meet the increased customer demands, microgrid evolved. The structure of microgrid changes dynamically due to the intermittent nature of renewable-based generation, status of the distributed generator and opening of breakers for fault/maintenance. Hence, the magnitude of fault current is dynamic in nature. In order to deal with these dynamic changes, this paper addresses an adaptive central microgrid controller-based protection and relay coordination scheme, which revises the relay settings dynamically (both radial and looped configuration) for every change in topology. In the proposed algorithm, the primary relay responds to a fault immediately since the individual relays are given with fault level setting. For any abnormality in the network, the fault location is determined both via local relay and microgrid central controller (MCC). Hence, even though the local relay fails to identify the fault due to high fault impedance, the MCC locates the fault accurately and isolates the minimum faulty part. The coordination between relays is carried out by MCC in a time-graded manner based on microgrid central protection and relay coordination algorithm. The proposed algorithm is tested using Matlab in a microgrid built based on the IEEE 33 bus distribution network.

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An adaptive protection coordination strategy utilizing user-defined characteristics of DOCRs in a microgrid

Cited by 19 publications

References 32 publications

Stability-Constrained Settings of Directional Overcurrent Relays With Shifted User-Defined Characteristics for Distribution Networks With DERs

Stability-Constrained Settings of Directional Overcurrent Relays With Shifted User-Defined Characteristics for Distribution Networks With DERs

Optimization Techniques for Directional Overcurrent Relay Coordination: A Comprehensive Review

An Adaptive Centralized Protection and Relay Coordination Algorithm for Microgrid

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