Planning the Coordination of Directional Overcurrent Relays for Distribution Systems Considering DG

Huchel, Lukasz; Zeineldin, H. H.

doi:10.1109/tsg.2015.2420711

Cited by 135 publications

(60 citation statements)

References 18 publications

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“…The slow calculation procedure of such a normal evolutionary algorithm (without fast coordination method) cannot satisfy the continuous monitoring and protection of a large scale system or a flexible smart grid where loads and distributed generations [24][25][26][27] continuously connect or disconnect themselves to the grid and change the dynamic situation of the grid. The protection of a smart grid will be more intensive and extremely complicated in presence of fluctuations and a quite long time consuming algorithm without providing optimum results, is not able to follow the instantaneous state of the grid therefore the online/offline protection scheme based on such algorithms would result in mal-operation and serious damages.…”

Section: Analytical Resultsmentioning

confidence: 99%

An Innovative Fast Relay Coordination Method to Bypass the Time Consumption of Optimization Algorithms in Relay Protection Coordination

Kheshti¹,

Kang²,

Jiao³

2017

Journal of Electrical Engineering and Technology

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-Relay coordination in power system is a complex problem and so far, meta-heuristic algorithms and other methods as an alternative approach may not properly deal with large scale relay coordination due to their huge time consuming computation. In some cases the relay coordination could be unachievable. As the urgency for a proper approach is essential, in this paper an innovative and simple relay coordination method is introduced that is able to be applied on optimization algorithms for relay protection coordination. The objective function equation of operating time of relays are divided into two separate functions with less constraints. As the analytical results show here, this equivalent method has a remarkable speed with high accuracy to coordinate directional relays. Two distribution systems including directional overcurrent relays are studied in DigSILENT software and the collected data are examined in MATLAB. The relay settings of this method are compared with particle swarm optimization and genetic algorithm. The analytical results show the correctness of this mathematical and practical approach. This fast coordination method has a proper velocity of convergence with low iteration that can be used in large scale systems in practice and also to provide a feasible solution for protection coordination in smart grids as online or offline protection coordination.

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Section: Analytical Resultsmentioning

confidence: 99%

An Innovative Fast Relay Coordination Method to Bypass the Time Consumption of Optimization Algorithms in Relay Protection Coordination

Kheshti¹,

Kang²,

Jiao³

2017

Journal of Electrical Engineering and Technology

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“…A year later, a strategy in terms of planning scope for future DG installations was proposed in [54] to avoid protection miscoordination which traditionally requires frequent modifications in relay settings. This strategy avoids the frequent setting modifications by incorporating constraints in a linear programming problem which is capable to ensure protection coordination for different DG sizes.…”

Section: Directional Overcurrent Relaysmentioning

confidence: 99%

“…Compared to the above strategy which is formulated as a NLP, more recently, the authors in [54] had to focus on future DG planning scenarios and formulated a linear programming problem. It had a simplex algorithm with application of FCL which can identify a set of optimum relay settings which is effective for every potential new DG installation.…”

Section: Mathematical Algorithm Approachmentioning

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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“…(iv) Changing the available protective devices or installing the new ones such as breakers, re-closers, or distance/directional relays that are not usually used in DN is proposed in other works. [14][15][16][17][18][19][20][21][22] Distance protection as common practice for transmission line protection is investigated in Huang et al 18 In Tsimtsios et al, 19 a forward distance element is enabled in each relay to protect the main line segment, while a reverse distance element is enabled in each relay for protecting the adjacent buses and laterals. The method is suitable for different fault/system conditions, avoiding the need for adaptive protection schemes.…”

Section: Introductionmentioning

confidence: 99%

Fuse saving scheme in highly photovoltaic‐integrated distribution networks

Hajimohammadi

Fani

Sadeghkhani

2019

Int Trans Electr Energ Syst

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Summary The high penetration level of photovoltaic (PV) units increases their injected fault current that it may result in fuse‐recloser miscoordination in distribution networks. The conventional coordination techniques are based on shifting the fast operation curve of the recloser below the characteristic curve of the fuse for fuse saving in the case of a temporary fault. However, these techniques save fuse if the slopes of fuse and recloser characteristic curves are same. Also, in the case of the high penetration level of PV systems, the conventional schemes are not effective. To address these problems, this paper proposes two fuse saving strategies that not only modify the difference between the slopes of fuse and recloser characteristic curves but also are effective for various penetration levels of PV units in the distribution network. The proposed protection scheme does not require the communication infrastructure and can be implemented in both conventional and digital reclosers installed in the distribution network. The reliable performance of the proposed fuse saving strategies is assessed on the simulation model of the Isfahan distribution network.

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Planning the Coordination of Directional Overcurrent Relays for Distribution Systems Considering DG

Cited by 135 publications

References 18 publications

An Innovative Fast Relay Coordination Method to Bypass the Time Consumption of Optimization Algorithms in Relay Protection Coordination

An Innovative Fast Relay Coordination Method to Bypass the Time Consumption of Optimization Algorithms in Relay Protection Coordination

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

Fuse saving scheme in highly photovoltaic‐integrated distribution networks

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