An enhanced role for an energy storage system in a microgrid with converter-interfaced sources

The Journal of Engineering

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[1] Department of Electrical and Computer Engineering, Aristotle University, Thessaloniki, 54124, Greece;

关键词: distributed power generation;    energy storage;    power convertors;    distribution networks;    photovoltaic power systems;    energy storage system;    microgrid;    converter-interfaced sources;    ESS;    point of common coupling;    PCC;    utility grid;    island operation;    Standard EN 50160;    adjustable droop control method;    distributed energy resources;    load demand;    seamless synchronisation;    grid-connected mode;    zero-sequence voltage;    DER;    power losses reduction;    distribution lines;    photovoltaics;   

DOI  :  10.1049/joe.2014.0281

来源: publisher

【 摘 要 】

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.

【 授权许可】

CC BY