An adaptive protection scheme for optimal coordination of overcurrent relays

Abdelaziz, Almoataz Y.; Talaat, H.; Nosseir, A.; Hajjar, Ammar A.

doi:10.1016/s0378-7796(01)00176-6

Cited by 145 publications

(95 citation statements)

References 8 publications

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“…All the maximum short-circuit contributions considered in n i and m i nodes for all fault paths are entered in Tables 7 and 8. In the objective function design in Section 5 and in many publications, too [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30], the selectivities met only in the primary and secondary nodes have been assumed. To verify the selectivity is met, not only in these nodes but in the entire protected section (between the primary and secondary nodes), different short-circuits placements have been explored in the protected section.…”

Section: Protection Coordination Examplementioning

confidence: 99%

“…In most of these works, an appropriately designed optimization is shown as a suitable tool for this purpose. For example, in [15][16][17][18][19][20][21][22][23], the values of time multipliers M Oi are determined for predetermined values of I pcOi and slopes (E Oi and K Oi ). For each protection, only one coefficient is looked for, and the linear programming can be used.…”

mentioning

confidence: 99%

“…In the latter, the optimization is nonlinear and a more sophisticated optimization method must be used. However, all the aforementioned works [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] have mainly focused on the optimization process itself, but not much attention has been paid to choosing the proper short-circuit contributions types; additionally, only the maximum and minimum short-circuit contributions have been taken into account (and/or the current contributions values, without a calculation process description, have only been mentioned). As will be described in the article, the maximum and minimum short-circuit contributions can only be used if the short-circuit contributions flowing through primary and selective protections are the same.…”

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confidence: 99%

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Directional Overcurrent Relays Coordination Problems in Distributed Generation Systems

Ehrenberger

Švec

2017

Energies

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This paper proposes a new approach to the distributed generation system protection coordination based on directional overcurrent protections with inverse-time characteristics. The key question of protection coordination is the determination of correct values of all inverse-time characteristics coefficients. The coefficients must be correctly chosen considering the sufficiently short tripping times and the sufficiently long selectivity times. In the paper a new approach to protection coordination is designed, in which not only some, but all the required types of short-circuit contributions are taken into account. In radial systems, if the pickup currents are correctly chosen, protection coordination for maximum contributions is enough to ensure selectivity times for all the required short-circuit types. In distributed generation systems, due to different contributions flowing through the primary and selective protections, coordination for maximum contributions is not enough, but all the short-circuit types must be taken into account, and the protection coordination becomes a complex problem. A possible solution to the problem, based on an appropriately designed optimization, has been proposed in the paper. By repeating a simple optimization considering only one short-circuit type, the protection coordination considering all the required short-circuit types has been achieved. To show the importance of considering all the types of short-circuit contributions, setting optimizations with one (the highest) and all the types of short-circuit contributions have been performed. Finally, selectivity time values are explored throughout the entire protected section, and both the settings are compared.

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Section: Protection Coordination Examplementioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Directional Overcurrent Relays Coordination Problems in Distributed Generation Systems

Ehrenberger

Švec

2017

Energies

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“…It was also suggested by the researchers that after integrating each distribution unit, the existing protection coordination must be checked in order to identify the impacts of adding DGs to the power system. In [9],the authors used a new relay setting technique for the changed power generation and distribution in the power system to solve the miscoordination problem. In [10], the miscoordination problem was resolved by dividing the whole power system into different zones and installing a circuit breaker for each zone.…”

Section: Introductionmentioning

confidence: 99%

Protection coordination for a distribution system in the presence of distributed generation

Yousaf¹,

Mahmood²

2017

Turk J Elec Eng & Comp Sci

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This paper proposes an effective strategy to overcome the impacts on coordination among protection devices due to distributed generator (DG) integration. Increased fault current magnitude and changes in power flow directions are the major impacts imposed by DGs on a typical distribution system. The recloser-fuse coordination is much influenced upon the integration of DGs. The proposed approach presents the rehabilitation of recloser-fuse coordination for post-DG integration effects using the directional properties of a recloser. The simulation results show that coordination among protection devices can be regained using fast operation of the recloser to design a fuse saving scheme in the scenario of temporary fault occurrence. The designed scheme also works satisfactorily for the isolation of a permanently faulted section of the feeder. This technique is verified by simulation results performed on a real 11-kV radial distribution feeder for different fault locations and DG sizes.

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“…Thus, conventional protection schemes that are designed for power systems without considerations of the DG impacts are insufficient for supporting wider renewable energy-based DG penetration [23][24][25][26][27][28]. Thus, a new generation of protection schemes that explicitly considers these requirements and adapts the system operation are strongly required [29][30][31][32].…”

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confidence: 99%

Adaptive Protection Scheme for a Distribution System Considering Grid-Connected and Islanded Modes of Operation

et al. 2016

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The renewable energy-based distributed generation (DG) implementation in power systems has been an active research area during the last few decades due to several environmental, economic and political factors. Although the integration of DG offers many advantages, several concerns, including protection schemes in systems with the possibility of bi-directional power flow, are raised. Thus, new protection schemes are strongly required in power systems with a significant presence of DG. In this study, an adaptive protection strategy for a distribution system with DG integration is proposed. The proposed strategy considers both grid-connected and islanded operating modes, while the adaptive operation of the protection is dynamically realized considering the availability of DG power production (related to faults or meteorological conditions) in each time step. Besides, the modular structure and fast response of the proposed strategy is validated via simulations conducted on the IEEE 13-node test system.

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An adaptive protection scheme for optimal coordination of overcurrent relays

Cited by 145 publications

References 8 publications

Directional Overcurrent Relays Coordination Problems in Distributed Generation Systems

Directional Overcurrent Relays Coordination Problems in Distributed Generation Systems

Protection coordination for a distribution system in the presence of distributed generation

Adaptive Protection Scheme for a Distribution System Considering Grid-Connected and Islanded Modes of Operation

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