Method to resolve false trip of non‐directional overcurrent relays in radial networks equipped with distributed generators

Ghotbi-Maleki, Mahdi; Javadi, Hamid

doi:10.1049/iet-gtd.2018.5610

Cited by 22 publications

(16 citation statements)

References 29 publications

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“…The authors in [33, 34] have changed the settings of OC relays to avoid the false trip. In order to solve the false trip issue, it is suggested that the time setting of the false trip relay (

TM S^{f}

) is changed.…”

Section: Proposed Methodsmentioning

confidence: 99%

Accurate coordination method based on the dynamic model of overcurrent relay for industrial power networks taking contribution of induction motors into account

Ghotbi-Maleki

Chabanloo

Farrokhifar

2020

IET Generation, Transmission & Distribution

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“…The authors in [33, 34] have changed the settings of OC relays to avoid the false trip. In order to solve the false trip issue, it is suggested that the time setting of the false trip relay (

TM S^{f}

) is changed.…”

Section: Proposed Methodsmentioning

confidence: 99%

Accurate coordination method based on the dynamic model of overcurrent relay for industrial power networks taking contribution of induction motors into account

Ghotbi-Maleki

Chabanloo

Farrokhifar

2020

IET Generation, Transmission & Distribution

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“…According to Fig. 2, the number of BPs of this reduced network is equal to 2 because of two separated simple loops; and 6×6 OCRs pairs can be selected as reduced network's BPs, as shown in (1). Selecting each of these 36 possible choices as the MBPS and coordinating OCRs in the next step, accordingly result in different settings for OCRs and thus different operating times.…”

Section: Problem Statementmentioning

confidence: 99%

“…Overcurrent relays (OCR) are the most widely used relays in power networks, therefore, obtaining the optimal settings of these relays for their fast operation and preventing operation interference is an important problem. This action which is known as the coordination of OCRs, has been presented in the form of an optimization problem that can be solved with different types of optimization algorithms such as intelligent algorithms [1]- [4] and mathematical ones [5]- [6]. A comprehensive study about optimization algorithms has been provided in [7] and [8], also, a powerful optimization algorithm which made based on series and parallel combination of Genetic Algorithm (GA), Particle Swarm Optimization (PSO) and Non-Linear Programming (NLP) has been presented.…”

Section: Introductionmentioning

confidence: 99%

Determination of optimal breakpoint set of overcurrent relays using modified depth‐first search and mixed‐integer linear programming

Ghotbi-Maleki

Chabanloo

Ebadi

et al. 2020

IET Generation, Transmission & Distribution

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In the process of determination of breakpoints for overcurrent relays (OCR) in power delivery systems, different sets with equal number of OCRs can be selected as minimum breakpoint set (MBPS). Therefore, determination of the most appropriate MBPS is an issue which must be considered. This paper proposes a prioritization between different MBPSs based on the sum of operating times of OCRs. In this case, a set which results the minimum sum of operating times is selected as the appropriate MBPS. For this purpose, the proposed method combines two problems: determination of MBPS and coordination of OCRs, and is expressed in mixed-integer linear programming (MILP) form. Also, a modified depth-first search (DFS) algorithm is applied to determine the OCRs contained loops of studied networks. It is shown that the proposed method has the capability to be combined with previous defined expert rules in this field in order to consider the network conditions in the process of determination of optimal breakpoint set (OBPS). In order to reduce the number of removed coordination constraints, a novel expert rule is added to the existing ones. The proposed method has been implemented on small (8-bus), medium (14-bus and 30-bus) and large (118-bus and 3120-bus) networks, and the results show the effectiveness of proposed method in determining breakpoint set with the least number in first priority and minimum operating times of relays in second priority.

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“…These constraints are proposed such that NDOCRs and fuse are coordinated in such a way that pickup current setting (

P C S)

of NDOCRs and minimum melting current of fuse (

M M C)

of fuses are larger than the maximum reverse SCCs seen by NDOCRs and fuses. In [15], other settings in addition to

P C S

are obtained for the NDOCRs on healthy feeders such that their operating times (OTs) for reverse SCCs injected by DGs are larger than the OT of primary NDOCR at the faulty feeder. In [18], a coordination method based on a dynamic model of OC relays is proposed in order to prevent the false tripping issue caused by the contribution of induction motors to the SCC in industrial networks.…”

Section: Introductionmentioning

confidence: 99%

“…Various FTs according to[34] ,(8,17) ,(8,18) , (9, 8) , (9, 10) (9, 11) , (9, 12) , (9, 13) , (9, 14) , (9, 15) (9, 16) , (9, 17) , (9, 18) ,(13,9) , (13, 10)(13,11) ,(13,12) ,(13,14) ,(8,15) …”

mentioning

confidence: 99%

Coordination of non‐directional overcurrent relays and fuses in active distribution networks considering reverse short‐circuit currents of DGs

Ghotbi-Maleki

Taheri

Zeineldin

2021

IET Generation Trans & Dist

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The main protection equipment in radial distribution networks are non-directional overcurrent relays (NDOCR) and fuses which are coordinated using the conventional protection coordination method. By installing distributed generations (DGs) in the network, reverse short-circuit currents (SCC), injected from DGs, can lead to false tripping of NDOCRs and false melting of fuses. In the previous studies, some methods have been proposed to overcome these issues using directional overcurrent relays, fault current limiter, and adaptive methods that relay on communication. The present paper proposes a new coordination method to prevent these issues without the need for installing a new equipment, by proposing a new set of selectivity constraints. Here, selectivity between equipment is established, and false tripping and false melting issues are mitigated. The coordination of protection equipment according to the proposed method requires the use of optimization algorithms, and therefore, the proposed method is formulated as a mixed-integer linear programming method to take advantage of mathematical optimization algorithms. The proposed coordination method is applied to a real distribution network and the results indicate the high efficiency of the proposed method in dealing with false relay tripping and fuse melting issues.

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Method to resolve false trip of non‐directional overcurrent relays in radial networks equipped with distributed generators

Cited by 22 publications

References 29 publications

Accurate coordination method based on the dynamic model of overcurrent relay for industrial power networks taking contribution of induction motors into account

Accurate coordination method based on the dynamic model of overcurrent relay for industrial power networks taking contribution of induction motors into account

Determination of optimal breakpoint set of overcurrent relays using modified depth‐first search and mixed‐integer linear programming

Coordination of non‐directional overcurrent relays and fuses in active distribution networks considering reverse short‐circuit currents of DGs

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