On 8-bus test system for solving challenges in relay coordination

Rajput, Vipul N.; Pandya, Kartik S.

doi:10.1109/icpes.2016.7584009

Cited by 19 publications

(10 citation statements)

References 24 publications

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“…The required data for simulation and relays' coordination of the test system are extracted from [20] and [6].…”

Section: Simulation Resultsmentioning

confidence: 99%

“…The operating time of the (DOC) relays can be obtained from the general equation (1). Table ( 1) shows the values of parameters , which are defined based on relays characteristic curves standards IEC/IEEE [20], and the standard inverse characteristic curve is selected for (DOC) relays coordination in this paper. The proper operation of coordinated relays in the protected system is based on the accurate settings adjustment for these relays.…”

Section: Problem Formulationmentioning

confidence: 99%

“…DOCR Characteristic[20] Loop within the test systems.STEP (2) Select an initial loop containing N relays asthe main loop. The loop is to be routed forward and backward for relays' coordination.…”

mentioning

confidence: 99%

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Analytical Method for Directional over Current Relays Coordination in Micro Grids

Abul’Wafa¹,

Mahmoud²,

Mohamed³

2019

IJRTE

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Microgrids are consisting of interconnected loads and distributed generators which can operate with and without utility. The significant implementation of microgrids challenged the protection engineers especially in designing protection microgrid schemes. This challenge comes from the bi-directional fault current variation and the dynamic behavior of microgrids. The implementation of artificial intelligent (AI) techniques for coordinating the directional overcurrent relays (DOCRs) in Microgrids (MGs) is a promising solution. However, all the (AI) techniques estimate the solutions and achieve the objective function after an extensive number of iterations. This paperwork proposes an analytical method for solving the coordination of (DOC) relays in meshed Microgrids which operates in grid connected mode. The proposed analytical method needs a lesser simulation time than the (AI) techniques to find the proper settings for the coordinated directional overcurrent relays (DOCRs). A file code is written using MATLAB software to implement and test this methodology. Index Terms: Analytical methodology, directional overcurrent (DOC) relays coordination, artificial intelligent (AI), microgrids (MGs).

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“…The required data for simulation and relays' coordination of the test system are extracted from [20] and [6].…”

Section: Simulation Resultsmentioning

confidence: 99%

Section: Problem Formulationmentioning

confidence: 99%

See 1 more Smart Citation

Analytical Method for Directional over Current Relays Coordination in Micro Grids

Abul’Wafa¹,

Mahmoud²,

Mohamed³

2019

IJRTE

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“…In this case in addition to F operating − time , F Ins: − Deployment is considered in optimization process to reduce the economic burden. Afterwards, to reduce the number of employed D-TCCs as much as possible, various inverse-time curves 24 as presented in Table 1 are considered for DOCRs through the optimization process. For each of these case studies, detailed discussions are provided.…”

Section: Numerical Resultsmentioning

confidence: 99%

Coordination of mixed distance and directional overcurrent relays: Miscoordination elimination by utilizing dual characteristics for DOCRs

Yazdaninejadi

Nazarpour

Talavat

2018

Int Trans Electr Energ Syst

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Summary Keeping selectivity among protective devices in electrical grids is of crucial importance. This task in the combinatorial protection scheme of distance and directional overcurrent relays (DOCRs) stands as a complicated problem, especially in interconnected networks. To overcome this issue, this paper proposes an enhanced protection coordination (PC) scheme by employing dual time‐current characteristics (D‐TCCs) for overcurrent relays which are followed by two inverse‐time curves in series. These characteristics simplify the complexity of the problem and yield higher flexibility and extensibility in PC process which helps to meet selectivity requirements. However, these characteristics can be implemented by numerical DOCRs which poses investment costs. Therefore, a techno‐economic optimal replacement model is devised to attain a least‐cost numerical DOCRs deployment plan while eliminating miscoordination and minimizing total operation time of the relays. Furthermore, inverse‐time curves of DOCRs are selected optimally among available options for conventional relays. By doing so, the attained flexibility is intensified which lessens imparted economic burden through alleviating the replacement level of numerical DOCRs. The proposed approach calls the need for making amendments in coordination points to handle coordination problem in the case where both conventional DOCRs and numerical DOCRs with D‐TCCs are present. Therefore, coupled with the conventional selectivity constraints, the constraint associated with new coordination points are all together accommodated in the optimization process. The proposed model demonstrates a mixed integer nonlinear programming fashion which is solved with sine‐cosine algorithm. Several numerical studies are carried out to interrogate the validity of the proposed approach. The obtained results are encouraging.

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“…In this regard, the input data including the short‐circuit currents and the fault location (for near‐end, far‐end or at the mid‐point of the feeder) should be verified and the problem assumptions are the same. The research work in [28] proposes a comprehensive review on the assumptions made in different research works for the optimal coordination of DOCRs.…”

Section: Introductionmentioning

confidence: 99%

Hybrid mixed‐integer non‐linear programming approach for directional over‐current relay coordination

Javadi

Nezhad

Anvari-Moghadam

et al. 2019

J. eng.

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On 8-bus test system for solving challenges in relay coordination

Cited by 19 publications

References 24 publications

Analytical Method for Directional over Current Relays Coordination in Micro Grids

Analytical Method for Directional over Current Relays Coordination in Micro Grids

Coordination of mixed distance and directional overcurrent relays: Miscoordination elimination by utilizing dual characteristics for DOCRs

Hybrid mixed‐integer non‐linear programming approach for directional over‐current relay coordination

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