Open AccessAn enhanced role for an energy storage system in a microgrid with converter‐interfaced sources
Author(s) -
Oureilidis Konstantinos O.,
Demoulias Charis S.
Publication year - 2014
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2014.0281
Subject(s) - microgrid , voltage droop , distributed generation , ac power , computer science , energy storage , grid , voltage , power (physics) , electrical engineering , control theory (sociology) , engineering , voltage source , control (management) , renewable energy , physics , quantum mechanics , geometry , mathematics , artificial intelligence
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.