Microgrid Protection Using Communication-Assisted Digital Relays

Sortomme, E.; Venkata, S.S.; Mitra, Joydeep

doi:10.1109/tpwrd.2009.2035810

Cited by 474 publications

(190 citation statements)

References 11 publications

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“…In this paper it has been assumed that the OCRs possess inverse definite characteristics and thus the values of A and B are taken to be 0.14 and 0.02 respectively [19] [20]. Therefore, the operating time of OCRs can be expressed as shown in "Equation (2)".…”

Section: Methodology and Problem Formulationmentioning

confidence: 99%

Coordination of Overcurrent Relay in Distributed System for Different Network Configuration

Choudhary¹,

Mohanty²,

Singh³

2015

JPEE

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This paper presents a study on protection coordination of overcurrent relays (OCRs) in a distributed system by considering its different operating modes. Two different case studies which are considered in present work for protection coordination include: (i) DG interfaced distribution system in grid connected mode and (ii) DG interfaced distribution system in islanded mode of operation. The proposed approach is tested on the Canadian urban benchmark distribution system consisting of 9 buses. On the occurrence of fault, level of fault current changes which in turn changes the operating time of various OCRs. Therefore, it is important to calculate and suggest method of the relay setting in order to minimize the operating time of relays and also to avoid its mal-operation. In this paper, the protection scheme is optimally designed by taking into account the above mentioned conditions. The operating time of relays can be decreased and, at the same time, coordination can be maintained by considering the optimum values of time dial setting (TDS). Genetic Algorithm (GA) has been used for determining the optimum values of TDS and hence operating time.

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Section: Methodology and Problem Formulationmentioning

confidence: 99%

Coordination of Overcurrent Relay in Distributed System for Different Network Configuration

Choudhary¹,

Mohanty²,

Singh³

2015

JPEE

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“…Reference [26] devised a differential protection scheme employing digital relays and a communication system. According to the scheme designed, the primary protection in grid-connected mode is based on a differential scheme where each feeder segment trips the switching device on both ends of a faulted feeder.…”

Section: Protection Using Communicationmentioning

confidence: 99%

A Comprehensive Review of Protection Schemes for Distributed Generation

Shahzad¹,

Asgarpoor²

2017

EPE

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Due to the increasing demand of energy and the need for nonconventional energy sources, distributed generation (DG) has come into play. The trend of unidirectional power flow has been gradually shifting. With new technology comes new challenges, the introduction of DG into the conventional power system brings various challenges; one of the major challenges is system protection under DG sources. These sources pose a significant challenge due to bidirectional flows from DGs as well as lower fault current contribution from inverter interfaced DGs. This paper reviews existing protection schemes that have been suggested for active distribution networks. Most of these protection strategies apply only to smaller distribution systems implying that they may need to be extended to larger systems with a much higher penetration of distributed generation. In the end, a potential protection scheme has also been recommended as a future work.

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“…This becomes even more problematic if the microgrid were to operate in islanded mode [1][2][3]. Other reported microgrid concerns that can cause protection difficulty include the bi-directionality of power flow [5], and the diversification of DERs [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…A microgrid can experience a fairly wide range of fault current magnitudes and, thus, conventional overcurrent schemes are not effective for microgrid protection [8]. In fact, lower available source currents will result in longer trip times or blinding [6,7]. Fault detection methods utilizing voltage sag information have been successfully demonstrated in the literature [9].…”

Section: Introductionmentioning

confidence: 99%

Model-Based Fault Detection of Inverter-Based Microgrids and a Mathematical Framework to Analyze and Avoid Nuisance Tripping and Blinding Scenarios

et al. 2018

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Abstract:Traditional protection methods such as over-current or under-voltage methods are unreliable in inverter-based microgrid applications. This is primarily due to low fault current levels because of power electronic interfaces to the distributed energy resources (DER), and IEEE1547 low-voltage-ride-through (LVRT) requirements for renewables in microgrids. However, when faults occur in a microgrid feeder, system changes occur which manipulate the internal circuit structure altering the system dynamic relationships. This observation establishes the basis for a proposed, novel, model-based, communication-free fault detection technique for inverter-based microgrids. The method can detect faults regardless of the fault current level and the microgrid mode of operation. The approach utilizes fewer measurements to avoid the use of a communication system. Protecting the microgrid without communication channels could lead to blinding (circuit breakers not tripping for faults) or nuisance tripping (tripping incorrectly). However, these events can be avoided with proper system design, specifically with appropriately sized system impedance. Thus, a major contribution of this article is the development of a mathematical framework to analyze and avoid blinding and nuisance tripping scenarios by quantifying the bounds of the proposed fault detection technique. As part of this analysis, the impedance based constraints for microgrid system feeders are included. The performance of the proposed technique is demonstrated in the MATLAB/SIMULINK (MathWorks, Natick, MA, USA) simulation environment on a representative microgrid architecture showing that the proposed technique can detect faults for a wide range of load impedances and fault impedances.

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Microgrid Protection Using Communication-Assisted Digital Relays

Cited by 474 publications

References 11 publications

Coordination of Overcurrent Relay in Distributed System for Different Network Configuration

Coordination of Overcurrent Relay in Distributed System for Different Network Configuration

A Comprehensive Review of Protection Schemes for Distributed Generation

Model-Based Fault Detection of Inverter-Based Microgrids and a Mathematical Framework to Analyze and Avoid Nuisance Tripping and Blinding Scenarios

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