Insight into microgrid protection

Brahma, Sukumar; Trejo, Jonathan; Stamp, Jason Edwin

doi:10.1109/isgteurope.2014.7028820

Cited by 23 publications

(11 citation statements)

References 13 publications

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“…For this case, the proposed protection scheme was tested on the radial microgrid shown in Fig. 11 [22]. Feeders are modelled using 336ACSR with positive sequence impedance of 0.27974+j0.6388 Ω/mile and zero sequence impedance of 0.57118+j1.80198 Ω/mile.…”

Section: Simulation Resultsmentioning

confidence: 99%

Protection of Renewable-dominated Microgrids: Challenges and Potential Solutions

Elkhatib

Ellis

Biswal

et al. 2016

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In this report we address the challenge of designing efficient protection system for inverterdominated microgrids. These microgrids are characterised with limited fault current capacity as a result of current-limiting protection functions of inverters. Typically, inverters limit their fault contribution in sub-cycle time frame to as low as 1.1 per unit. As a result, overcurrent protection could fail completely to detect faults in inverter-dominated microgrids. As part of this project a detailed literature survey of existing and proposed microgrid protection schemes were conducted. The survey concluded that there is a gap in the available microgrid protection methods. The only credible protection solution available in literature for lowfault inverter-dominated microgrids is the differential protection scheme which represents a robust transmission-grade protection solution but at a very high cost. Two non-overcurrent protection schemes were investigated as part of this project; impedance-based protection and

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Section: Simulation Resultsmentioning

confidence: 99%

Protection of Renewable-dominated Microgrids: Challenges and Potential Solutions

Elkhatib

Ellis

Biswal

et al. 2016

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“…Traditional protection devices such as overcurrent relays, Differential Relays, and Distance relays each face unique challenges when present in a microgrid setting [19].…”

Section: Analysis Of Existing Protection Devicesmentioning

confidence: 99%

“…The switch from one state to another changes the sources of fault current available to the system and thus the amount of fault current observed by an OC relay element. Generally, the fault current available in grid-connected mode is many times greater than the fault current available in islanded mode, leading to large coordination ranges for OC based protection devices [19].…”

Section: Overcurrent Elementsmentioning

confidence: 99%

“…Differential protection of feeders requires data sharing between devices either through digital communication or through physical wires between devices to achieve coordination. This may be feasible for geographically small microgrids [19]. Differential protection for a microgrid, while feasible in principle, in actuality can become impractical due to the cost associated with the intensive communication needed for differential protection.…”

Section: Differential Protectionmentioning

confidence: 99%

“…It is conventional for a tapped feeder to either be protected by a differential scheme, or a distance scheme using intertripping. A communication network between the devices is necessary for intertripping; therefore, there is little to no advantage to using distance protection over differential protection in this scenario [19].…”

Section: Distance Protectionmentioning

confidence: 99%

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Adaptive Protection Scheme for a Real-World Microgrid with 100% Inverter-Based Resources

Patel

Brahma

Hernández-Alvídrez

et al. 2020

2020 IEEE Kansas Power and Energy Conference (KPEC)

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The integration of renewable and distributed energy resources to the electric power system is expected to increase, especially at the distribution level. As more renewable generation connects to distribution systems, it is imminent that existing distribution feeders will be converted to microgrids. Microgrids are systems, typically at distribution voltage level, sustained by distributed and often renewable sources, that can operate in grid-connected and islanded modes. Microgrids offer resilience by providing the flexibility of supporting the grid in normal operation and operating as self-sustained islands when the grid is disconnected.

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