Safety analysis of a microgrid

Jayawarna, N.; Jenkins, Nicholas; Barnes, Malcolm; Lorentzou, M.I.; Papthanassiou, S.; Hatziagyriou, N.

doi:10.1109/fps.2005.204228

Cited by 55 publications

(28 citation statements)

References 2 publications

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“…The islanded system can ride through short-circuits if there is sufficient over-sizing of power electronic interfaces in order to provide adequate shortcircuit currents. At the same time, a novel protection scheme for the MG must be developed using different types of relays and breakers instead of conventional fuses [34]. Resulting from this explanation, the following considerations can be made [1]:…”

Section: Inverter Modelling During Short-circuitsmentioning

confidence: 99%

MicroGrids Operation and Control under Emergency Conditions

Moreira

Lopes

2012

Power Systems

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Absract. MicroGrids comprise low voltage distribution systems with distributed energy sources, storage devices and controllable loads, operated connected to the main power network or autonomously, in a controlled coordinated way. In case of MicroGrids autonomous operation, management of instantaneous active power balance imposes unique challenges. Traditionally, power grids are supplied by sources having rotating masses and these are regarded as essential for the inherent stability of the system. In contrast, MicroGrids are dominated by inverter interfaced sources that are inertia-less, but do offer the possibility of a more flexible operation. When a forced or scheduled islanding takes place in a MicroGrid, it must have the ability to operate stably and autonomously, requiring the use of suitable control strategies. The MicroGrid power sources can also be exploited in order to locally promote a service restoration strategy following a general blackout. A sequence of actions for the black start procedure is also presented and it is expected to be an advantage in terms of reliability as a result from the presence of very large amounts of dispersed generation in distribution grids.

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Section: Inverter Modelling During Short-circuitsmentioning

confidence: 99%

MicroGrids Operation and Control under Emergency Conditions

Moreira

Lopes

2012

Power Systems

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“…In the case of a fault, the traditional grid rotational generators are injecting large fault currents, thus protection devices in the distribution network are mainly over-current sensing. The fault current emitted through the power electronics interfaced micro-sources inside the micro-grid, will be below the levels of traditional generators fault current (Jayawarna et al, 2005). Thus, possible faulty currents from micro-sources may not be detected by existing over-current relays.…”

Section: Intentional Islandingmentioning

confidence: 99%

“…An essential condition for the operation of micro-grids in an islanded mode is their compliance to the same safety requirements as those traditional centralised-generation operated networks (Jayawarna et al, 2005). In the case of a fault, the traditional grid rotational generators are injecting large fault currents, thus protection devices in the distribution network are mainly over-current sensing.…”

Section: Intentional Islandingmentioning

confidence: 99%

See 1 more Smart Citation

Energy Storage for Balancing a Local Distribution Network Area

Unda¹,

Papadopoulos²,

Skarvelis‐Kazakos³

et al. 2011

Energy Storage in the Emerging Era of Smart Grids

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“…To the utility grid, a microgrid behaves as a fully controllable load. A microgrid is usually operated in the grid connected mode, and it can be operated in island mode [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

A Practical Protection Coordination Strategy Applied to Secondary and Facility Microgrids

et al. 2012

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Abstract:In a conventional distribution system, protection algorithms are designed to operate on a unidirectional high fault-current level. In a microgrid, a fault current from distributed generation (DG) may bring about a relay malfunction because of the bidirectional and relatively small fault current. Therefore, the conventional protection scheme is not applicable to microgrids and a new protection method must be developed. In this paper, two protection coordination algorithms which can be applied for facility and secondary microgrids are proposed, respectively. The proposed protection algorithms eliminate faults not by the EMS signal but by directional relays. Moreover, this makes the algorithms flexible regardless of the types and numbers of DG. The proposed protection algorithms were simulated at the KEPCO RI Microgrid Demonstration Site.

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Safety analysis of a microgrid

Cited by 55 publications

References 2 publications

MicroGrids Operation and Control under Emergency Conditions

MicroGrids Operation and Control under Emergency Conditions

Energy Storage for Balancing a Local Distribution Network Area

A Practical Protection Coordination Strategy Applied to Secondary and Facility Microgrids

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