Future Distribution Feeder Protection Using Directional Overcurrent Elements

Jones, Doug; Kumm, John

doi:10.1109/tia.2013.2283237

Cited by 46 publications

(20 citation statements)

References 3 publications

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“…The first group proposes the modification of the existing protective philosophy by applying alternative conventional protective methodologies. Such methodologies are the voltage-based protection [82], the distance protection [83], the differential protection [84,85] and the directional overcurrent protection [86]. The second group approaches this problem differently, trying to mitigate the adverse behavior of the DRES in case of short-circuit faults, as for example by applying fault current limiters [87,88] and disconnecting the DRES [89,90].…”

Section: Frt Capability and Fault-clearingmentioning

confidence: 99%

Ancillary Services Market Design in Distribution Networks: Review and Identification of Barriers

Oureilidis

Malamaki

Gallos³

et al. 2020

Energies

106

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The high proliferation of converter-dominated Distributed Renewable Energy Sources (DRESs) at the distribution grid level has gradually replaced the conventional synchronous generators (SGs) of the transmission system, resulting in emerging stability and security challenges. The inherent characteristics of the SGs are currently used for providing ancillary services (ASs), following the instructions of the Transmission System Operator, while the DRESs are obliged to offer specific system support functions, without being remunerated for these functions, but only for the energy they inject. This changing environment has prompted the integration of energy storage systems as a solution for transfusing new characteristics and elaborating their business in the electricity markets, while the smart grid infrastructure and the upcoming microgrid architectures contribute to the transformation of the distribution grid. This review investigates the existing ASs in transmission system with the respective markets (emphasizing the DRESs’ participation in these markets) and proposes new ASs at distribution grid level, with emphasis to inertial response, active power ramp rate control, frequency response, voltage regulation, fault contribution and harmonic mitigation. The market tools and mechanisms for the procurement of these ASs are presented evolving the existing role of the Operators. Finally, potential barriers in the technical, regulatory, and financial framework have been identified and analyzed.

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Section: Frt Capability and Fault-clearingmentioning

confidence: 99%

Ancillary Services Market Design in Distribution Networks: Review and Identification of Barriers

Oureilidis

Malamaki

Gallos³

et al. 2020

Energies

106

View full text Add to dashboard Cite

show abstract

“…2. Jones et al in [52] highlighted that traditional setting of the directional element will cause a reliability threat at various VAR flows depending on DG types. They demonstrated the drawbacks of NDOCR and the consequences of improper configuration for directional elements.…”

Section: Directional Overcurrent Relaysmentioning

confidence: 99%

“…Another disadvantage is the false tripping impact at the upstream feeder end, which may occur when DG feeding faults on adjacent feeders which are using the NDOCR. Therefore, it is recommended that directional elements are featured in Jones et al in [52] highlighted that traditional setting of the directional element will cause a reliability threat at various VAR flows depending on DG types. They demonstrated the drawbacks of NDOCR and the consequences of improper configuration for directional elements.…”

Section: Directional Overcurrent Relaysmentioning

confidence: 99%

Progress on Protection Strategies to Mitigate the Impact of Renewable Distributed Generation on Distribution Systems

et al. 2017

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Abstract:The benefits of distributed generation (DG) based on renewable energy sources leads to its high integration in the distribution network (DN). Despite its well-known benefits, mainly in improving the distribution system reliability and security, there are challenges encountered from a protection system perspective. Traditionally, the design and operation of the protection system are based on a unidirectional power flow in the distribution network. However, the integration of distributed generation causes multidirectional power flows in the system. Therefore, the existing protection systems require some improvement or modification to address this new feature. Various protection strategies for distribution system have been proposed so that the benefits of distributed generation can be fully utilized. This paper reviews the current progress in protection strategies to mitigate the impact of distributed generation in the distribution network. In general, the reviewed strategies in this paper are divided into: (1) conventional protection systems and (2) modifications of the protection systems. A comparative study is presented in terms of the respective benefits, shortcomings and implementation cost. Future directions for research in this area are also presented.

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“…e use of nondirectional overcurrent relays that operate regardless of the fault current direction leads to false tripping decisions due to the microgrid operations and the backfeed fault current from DGs [2]. Electromechanical and digital overcurrent relays equipped with directional components and a single relay setting have been developed to overcome the deficiency of faulty current detection [3]. Dual setting directional overcurrent relays (DOCRs) have been proposed in [4,5] to improve the capabilities of conventional DOCRs for protecting meshed distribution systems with DGs.…”

Section: Introductionmentioning

confidence: 99%

Implementation of Optimal Protection Coordination for Microgrids with Distributed Generations Using Quaternary Protection Scheme

Thararak

Jirapong

2020

Journal of Electrical and Computer Engineering

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The flexible operation of microgrids, along with the availability of distributed generation (DG) units, causes a variety of changes in short-circuit current levels, magnitudes, and directions, which has undesirable effects on the operation of protection systems. Conventional protection schemes use typical directional overcurrent relays (DOCRs) with limited operating capability, unable to respond to microgrid operations in the manner of short-circuit current changes. In this paper, a quaternary protection scheme implemented with dual-directional overcurrent relays (dual-DOCR) and a protection control strategy is developed for protecting against faults in microgrids, taking into account the existence of DGs and connection and disconnection of DG units. The optimal dual-DOCRs setting and coordination are formulated as an optimization problem solved by evolutionary programming to minimize the relay operating times. The proposed protection scheme is implemented with a centralized protection control system based on the smart grid concept to increase the adaptability of the dual-DOCRs, which have multiple relay setting groups in accordance with system state changes. The simulation case studies are performed using the IEEE 14-bus test system, which is modified as a meshed microgrid operation. Test scenarios, including possible operations of microgrids, DGs availabilities, and different fault events, are analyzed and discussed. The comparative studies and simulation results show that the proposed scheme provides efficient coordination between the primary and backup relays and increases the responsibility of the protection system, which can be observed from the significant reduction in the relay operating times, resulting in the enhancement of selectivity, sensitivity, and speed of microgrid protection systems.

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Future Distribution Feeder Protection Using Directional Overcurrent Elements

Cited by 46 publications

References 3 publications

Ancillary Services Market Design in Distribution Networks: Review and Identification of Barriers

Ancillary Services Market Design in Distribution Networks: Review and Identification of Barriers

Progress on Protection Strategies to Mitigate the Impact of Renewable Distributed Generation on Distribution Systems

Implementation of Optimal Protection Coordination for Microgrids with Distributed Generations Using Quaternary Protection Scheme

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