An analytic approach for optimal coordination of overcurrent relays

Mahari, Arash; Seyedi, Heresh

doi:10.1049/iet-gtd.2012.0721

Cited by 90 publications

(53 citation statements)

References 20 publications

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“…(20)(21)(22), and are equal to 2, and w is a factor of and with values 0.4 and 0.9 respectively, and depict the present position and velocity of particle in a D-dimensional search space. The case study in Fig.…”

Section: Analytical Resultsmentioning

confidence: 99%

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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%

“…The minimum and maximum operating time of each relay is set to 0.1s and 4s. Here, as for microprocessor based relays, the continuous form of TMS and PS are considered as relay settings [5,[20][21][22][23]30].…”

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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show abstract

“…An approach based on the "interior point primal-dual algorithm" was discussed in [27] where additional constraints were imposed by distance relays and breaker failure on relay coordination studies. Gradient search based technique was also applied successfully for optimization of relay coordination problems for mid line faults [28].…”

Section: Analytic Methodsmentioning

confidence: 99%

“…In [69,70], adaptive optimal methodology based on a modified PSO technique were applied for selection of over current relay settings during on line mode according as per the prevailing network topology. The pre-solution and filtering simplification techniques were used prior to the application of linear programming algorithm for reducing the size and complexity of system [27]. The interior point based approach reaches close to the vicinity of the final optimal result hardly in only one or two iteration.…”

Section: Adaptive Relaying Based Methodsmentioning

confidence: 99%

Protection coordination in distribution systems with and without distributed energy resources- a review

Singh

2017

Prot Control Mod Power Syst

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Emission of greenhouse gases and depletion of fossil fuel reserves are two key drivers, which are forcing the mankind to generate the future energy demand from the renewable energy resources. These resources are generally distributed in nature and are directly integrated at distribution levels. Increasing penetration of the distributed energy resources in distribution power networks creates additional operational and control issues. These are mostly regulatory, economical load dispatching, power quality and protection issues. Generally power distribution systems are protected with the help of dedicated over current based protection schemes. But increasing share of distributed energy resources penetration in electric utilities poses a serious threat to the existing protection coordination schemes of the distribution systems. Distributed energy resources connected distribution networks become interconnected in nature and protection coordination schemes, which are designed for unidirectional flow of fault currents become ineffective/non-functional. Therefore, new protection coordination schemes are required for providing the adequate protection coordination for distributed energy resources connected electric power networks. In the available literature, the protection coordination schemes for radial distribution systems and developments in the area of protection coordination are discussed in detail. A thorough review for all these protection coordination schemes for distribution systems with and without distributed energy resources is done in this review article. It includes the analytical and artificial intelligence based techniques application for coordination of protective relays in the distribution systems. The limitations and research gaps in the area of protection coordination schemes are also presented in this review article. The aim of this research paper is to bring all the available research in the area of relay coordination on one platform, so that it will help the emerging researcher to identify the future scope of relay coordination application for distributed energy resources connected distribution systems.

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“…As far as analytic techniques are concerned, several iterative numerical algorithms have been proposed [8]- [13]. In these approaches, the coordination constraints form a system of inequalities, and acceptable values of time dial and pickup current settings are calculated in each iteration.…”

Section: A Literature Reviewmentioning

confidence: 99%

A Novel Quadratically Constrained Quadratic Programming Method for Optimal Coordination of Directional Overcurrent Relays

Papaspiliotopoulos

Korres

Maratos

2017

IEEE Trans. Power Delivery

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The coordination of directional overcurrent relays (DOCRs) in meshed power grids with multiple sources is a constrained optimization problem, which has been stated in recent literature as linear (LP), nonlinear (NLP), and mixed integer nonlinear programming (MINLP) problem. In this paper, the DOCR coordination NLP problem is reformulated as an equivalent quadratically constrained quadratic programming (QCQP) model, leading to significant reduction of problem complexity. Another contribution of this work is the systematic problem statement using graph theory concepts. The proposed method is applied to three different meshed power systems, employing state-of-the-art optimization software. Simulation results demonstrate the efficacy and superiority of the proposed QCQP model over the prevailing NLP approach.Index Terms-Directional overcurrent relays, nonlinear programming, pickup current setting, power system protection, quadratically constrained quadratic programming, relay coordination, time dial setting. 0885-8977 (c)

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An analytic approach for optimal coordination of overcurrent relays

Cited by 90 publications

References 20 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

Protection coordination in distribution systems with and without distributed energy resources- a review

A Novel Quadratically Constrained Quadratic Programming Method for Optimal Coordination of Directional Overcurrent Relays

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