Efficient non-standard tripping characteristic-based coordination method for overcurrent relays in meshed power networks

Azari, Mehdi; Mazlumi, Kazem; Ojaghi, Mansour

doi:10.1007/s00202-021-01459-3

Cited by 7 publications

(3 citation statements)

References 34 publications

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“…The successive straight lines were joined together to formulate the new characteristic curve and a tabular format is used to adjust the curve for the existing industrial relays. For obtaining the optimal coordination of OCRs in meshed networks, the piece-wise linear characteristic (PWLC) has been evolved as a novel method [22]. It used variables coefficients, namely A and B, of the PWLCs of the OCRs for adjusting purposes and obtaining a more flexible TCC with the normally inverse (NI) standard; however, the proposed method was not tested by changing the location and the size of the DGs to evaluate their effect on the performance of the proposed approach.…”

Section: Literature Reviewmentioning

confidence: 99%

Innovative Optimal Nonstandard Tripping Protection Scheme for Radial and Meshed Microgrid Systems

Abeid

Alasali

et al. 2022

Energies

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The coordination of optimal overcurrent relays (OCRs) for modern power networks is nowadays one of the critical concerns due to the increase in the use of renewable energy sources. Modern grids connected to inverter-based distributed generations (IDGs) and synchronous distributed generations (SDGs) have a direct impact on fault currents and locations and then on the protection system. In this paper, a new optimal OCR coordination scheme has been developed based on the nonstandard time–current characteristics (NSTCC) approach. The proposed scheme can effectively minimize the impact of distributed generations (DGs) on OCR coordination by using two optimization techniques: genetic algorithm (GA) and hybrid gravitational search algorithm–sequential quadratic programming (GSA–SQP) algorithm. In addition, the proposed optimal OCR coordination scheme has successfully employed a new constraint reduction method for eliminating the considerable number of constraints in the coordination and tripping time formula by using only one variable dynamic coefficient. The proposed protection scheme has been applied in IEEE 9-bus and IEC MG systems as benchmark radial networks as well as IEEE 30-bus systems as meshed structures. The results of the proposed optimal OCR coordination scheme have been compared to standard and nonstandard characteristics reported in the literature. The results showed a significant improvement in terms of the protection system sensitivity and reliability by minimizing the operating time (OT) of OCRs and demonstrating the effectiveness of the proposed method throughout minimum and maximum fault modes.

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Section: Literature Reviewmentioning

confidence: 99%

Innovative Optimal Nonstandard Tripping Protection Scheme for Radial and Meshed Microgrid Systems

Abeid

Alasali

et al. 2022

Energies

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“…Protection and power quality constraints are the most important issues that limit the maximum penetration of DG in power systems. A change in the short-circuit level due to the presence of DGs might lead to incorrect operation of protective relays and protection miscoordination [13]. Therefore, in [14], using a proposed approach and a new objective function, the location, size, and type of DGs were optimized to maximize DG penetration and protection system speed and reduce power losses.…”

Section: Introductionmentioning

confidence: 99%

Optimal adaptive protection of smart grids using high‐set relays and smart selection of relay tripping characteristics considering different network configurations and operation modes

Ataee-Kachoee

Hashemi‐Dezaki

Ketabi

2022

IET Generation Trans & Dist

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Much attention has been paid to optimizing smart grids (SGs) and microgrids (MGs) protection schemes. The SGs' operation in different operating modes (especially gridconnected and islanded conditions) and various system configurations (such as the outage of each of the distribution generations) adversely influence the protection system. The adaptive protection schemes using different setting groups are suitable and reliable solutions to achieve a fast protective system. However, the literature shows a research gap in developing optimized adaptive protection schemes, focusing on constraint reduction, besides the optimal selection of time-current characteristics for direction overcurrent relays (DOCRs) and high-set relays (HSRs). This research aims to fill such a research gap. The power system analyses, such as power flow and short circuit studies, are done in DIgSI-LENT, and the genetic algorithm (GA) is used to find the optimum solutions. Test results of the IEEE 38-bus distribution system illustrate the advantages of this study compared to existing ones. The comparative test results emphasize that 31.78% and 21.62% decrement in time of the protective scheme in different topologies for the distribution networks of the IEEE 38-bus and IEEE 14-bus test systems could be achievable by simultaneously optimizing relay characteristics and HSRs compared to existing approaches.

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“…The settings of protection systems are performed by several methods [12][13][14][15][16][17]. These settings are such that protection systems must clear the fault in case of faults and separate the smallest part from the network.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Power System Reliability Incorporating Protection System Miscoordination

Sabzebin

Noghabi

Mazlumi

2022

Preprint

Self Cite

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The operation of protection systems has a considerable impact on power system reliability. The main reason for cascading outages is protection system misoperation. Two leading causes of protection system misoperation are protection system failure and incorrect settings. The failure of any of its components of the protection system results in failure to operate or undesired tripping and incorrect settings of relays cause protection miscoordination. In this paper, an analysis of power system reliability regarding failure and incorrect settings of the protection system is paid. This paper proposes an eight-state Markov model for a transmission line and its protection system incorporating protection system miscoordination distingue from failure to operate and undesired trip. The situation of network lines in the period of simulation time has been determined by the sequential Monte Carlo method, and are calculated the reliability indices such as Loss of Load Probability (LOLP), Loss of Load Expectation (LOLE), Expected Energy Not Supplied (EENS), and Expected Frequency of Load Curtailment (EFLC). The proposed model is applied to a 6-bus IEEE RBTS network, and the reliability indices are calculated and compared from both perspectives to show the importance of the proposed model.

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Efficient non-standard tripping characteristic-based coordination method for overcurrent relays in meshed power networks

Cited by 7 publications

References 34 publications

Innovative Optimal Nonstandard Tripping Protection Scheme for Radial and Meshed Microgrid Systems

Innovative Optimal Nonstandard Tripping Protection Scheme for Radial and Meshed Microgrid Systems

Optimal adaptive protection of smart grids using high‐set relays and smart selection of relay tripping characteristics considering different network configurations and operation modes

Evaluation of Power System Reliability Incorporating Protection System Miscoordination

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