A New Nonlinear Directional Overcurrent Relay Coordination Technique, and Banes and Boons of Near-End Faults Based Approach

Birla, Dinesh; Maheshwari, R. P.; Gupta, Hari Om

doi:10.1109/tpwrd.2005.861325

Cited by 199 publications

(116 citation statements)

References 22 publications

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“…On the same system, when the DG operates in CCM, the expression for fitness function is represented by Eq. (20). Fault location Primary relay (RP) Backup relay (RB) F1 R11 R14, R10' F2 R10 R14, R12 F3 R5 R10 F4 R4 R5 F5 R1 R4 F6 R2 R4 F7 R3 R2 F8 R6 R10 F9 R7 R6 F10 R8 R7 F11 R9 R8 F12 …”

Section: Simulation Results Of Ieee 34-node System Consisting Of Dualmentioning

confidence: 99%

Impact of distributed generator controllers on the coordination of overcurrent relays in microgrid

Choudhary¹,

Mohanty²,

Singh³

2017

Turk J Elec Eng & Comp Sci

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Abstract:In the presence of distributed generators (DGs) the fault current sensed by relay in the forward direction is larger than that in the reverse direction. Thus, it is required to have different relay settings for both forward and reverse directions. This paper investigates the impact of DG controller operating modes on the coordination of conventional and dual setting overcurrent relays (OCRs). The different DG control modes are voltage control mode (VCM) and current control mode (CCM). A comparative study of protection coordination is presented in both the operating modes of the DG. This scheme is tested on a 3-bus meshed system and the IEEE 34-node distribution system in which an electronically interfaced DG is connected. The protection coordination problem is formulated as a nonlinear programming problem and the optimal settings of OCRs are determined by using a genetic algorithm.

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Section: Simulation Results Of Ieee 34-node System Consisting Of Dualmentioning

confidence: 99%

Impact of distributed generator controllers on the coordination of overcurrent relays in microgrid

Choudhary¹,

Mohanty²,

Singh³

2017

Turk J Elec Eng & Comp Sci

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“…Nonlinear optimization based on General Algebraic modelling (GAMS) and sequential quadratic programming (SQP) [37] are reported in the literature. Application of random search technique (RST) for solving the relay coordination problems are also discussed in [38].…”

Section: Mathematical Based Optimization Methodsmentioning

confidence: 99%

“…The overall objective of all approaches is to maintain the desired coordination time margin between primary and corresponding backup relays and tripping of minimum relays. In [115], the fitness function is formulated as summation of operating time of all primary relays in the distribution systems and while in [37], it is formulated as minimization of total operating time of all primary relays for near end and far end faults. In [28], the fitness function is also defined minimization of operating time of primary relay as well as backup relays.…”

Section: Review Of Methodologies Used For Formulation Of Fitness Funcmentioning

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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“…It is also observed that if the objective function is changed to running sum of all vio lating constraints, all valid considered constraints are satisfied. [3] The prob lem of in feasibility of constraints does not arise with this approach. The quality of coordination achieved by performing DOCR coordination based on faults simulated at near ends only as compared to the faults on both ends, i.e., near -ends as well as fa r-ends .…”

Section: Non Linear Programmingmentioning

confidence: 99%

Relay Coordination using different methods-A Review

2014

IJAERD

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I. INTRODUCTIONA Relay nearest the fault point should operate first and if it fails to operate then backup relay must be operated in sequence to provide back-up protection is called Relay coordination. The relays in the power system are to be coordinated properly so as to provide primary as well as back up protection, and at the same time avoid mal function and hence avoid the unnecessary outage of healthy part of system. The system will be highly protected with back-up protection and proper co-ordination.Certain time interval must be maintain between the operating times of various protection devices to ensure correct sequential operation of devices.The time interval essential fo r maintain ing selectivity between primary and back up protections.[4] (Known as CTI) Manual calculat ion of relays is possible but, if the network is very large and co mplicated then it is very tedious to be done coordination of relays . [1] In modern power system, the directional over current relay causes difficulties in coordination but the main a dvantage is that the directional over current relaying is simple and economical. [5] In transmission systems it is widely used as a secondary protection and as a primary protection in distribution and sub-transmission systems.[5] II. CONSTRAINTS FOR RELAY COORDINATIONCoordination criteria for each Back up/Primary relay pairWhere tj,k = operating time of the primary relay Rj , fo r fau lt at k; ti,k = operating time of the backup relay Ri , for the same fault (at k) ∆t = CTI.[2]Bounds on relay settings for each relay[2]Where TMSi,min = min imu m value of of relay ; TMSi,max =maximu m value of o f relay ;[2]where PSi,min = minimu m value of of relay ; Psi,max = maximu m value of of relay .

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A New Nonlinear Directional Overcurrent Relay Coordination Technique, and Banes and Boons of Near-End Faults Based Approach

Cited by 199 publications

References 22 publications

Impact of distributed generator controllers on the coordination of overcurrent relays in microgrid

Impact of distributed generator controllers on the coordination of overcurrent relays in microgrid

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

Relay Coordination using different methods-A Review

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