An enhanced role for an energy storage system in a microgrid with converter-interfaced sources
- Author(s): Konstantinos O. Oureilidis 1 and Charis S. Demoulias 1
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View affiliations
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Affiliations:
1:
Department of Electrical and Computer Engineering , Aristotle University , Thessaloniki, 54124 , Greece
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Affiliations:
1:
Department of Electrical and Computer Engineering , Aristotle University , Thessaloniki, 54124 , Greece
- Source:
Volume 2014, Issue 11,
November
2014,
p.
618 – 625
DOI: 10.1049/joe.2014.0281 , Online ISSN 2051-3305
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An enhanced role for the energy storage system (ESS), strategically placed at the point of common coupling (PCC) of the microgrid with the utility grid, is proposed. During island operation, the ESS ensures that the frequency and magnitude of the voltage will remain within the limits specified by the Standard EN 50160. By implementing an adjustable droop control method, the distributed energy resources (DERs) adjust their active and reactive powers in order to fulfil the load demand. When the grid is recovered, the ESS detects its presence and achieves a seamless synchronisation of the microgrid with the main grid, without any kind of communication. In grid-connected mode, the DERs deliver their available active power, whereas their reactive power is determined by a zero-sequence voltage. This voltage is injected by the ESS and aims to the zeroing of the amount of reactive power at the PCC. In this way, a reduction of power losses in the distribution lines of the microgrid is achieved. The effectiveness of the proposed control method in all operation modes, without any physical communication means, is demonstrated through detailed simulation in a representative microgrid with DERs fed by photovoltaics.
Inspec keywords: distribution networks; photovoltaic power systems; energy storage; distributed power generation; power convertors
Other keywords: power losses reduction; PCC; Standard EN 50160; ESS; point of common coupling; grid-connected mode; distributed energy resources; adjustable droop control method; DER; photovoltaics; zero-sequence voltage; energy storage system; load demand; microgrid; distribution lines; converter-interfaced sources; seamless synchronisation; utility grid; island operation
Subjects: Distributed power generation; Solar power stations and photovoltaic power systems; Power convertors and power supplies to apparatus; Distribution networks
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