Journal
APPLIED ENERGY
Volume 230, Issue -, Pages 374-392Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apenergy.2018.08.054
Keywords
Microgrid; Reliability; Resilience; Energy storage; Distributed energy resources; Power system reserves
Categories
Funding
- EPSRC [EP/N034899/1, EP/N001974/1, EP/R030294/1]
- Complex Engineering Systems Institute [CONICYT-PIA-FB0816, ICM P-05-004-F]
- Energy Center at the University of Chile
- Conicyt-Chile [Fondecyt/1181928, Newton-Picarte/MR/N026721/1]
- Conicyt-Chile (SERC) [Fondap/15110019]
- EPSRC-UK project Energy Storage for Low Carbon Grids [EP/K002252/1]
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Microgrids are emerging to coordinate distributed energy resources and locally increase reliability to expected events and resilience to extreme events. Furthermore, by deploying their inherent flexibility, grid-connected microgrids are capable to provide different services at the system-level too. However, these are often assessed independently and a comprehensive integrated framework that can assess benefits for the whole power system is missing. In this outlook, this paper introduces a system-level assessment framework based on the concept of different duration's reserve services that can be provided by microgrids to the main electricity grid in response to both credible (reliability-oriented) and extreme, possibly unforeseen (resilience-oriented) contingencies. Probabilistic capacity tables accounting for different sources of uncertainty related to both microgrids' operation and occurrences of unfavorable events are built to assess the microgrids' potential capacity contribution to a particular reserve service. Case studies based on representative microgrids and a British test system clearly illustrate and quantify how aggregation of microgrids could provide significant contribution to both short-term reliability and longer-duration resilience services far beyond the simple summation of the individual contributions, thus demonstrating a clear synergic effect, as well as the key role played by different forms of energy storage. The proposed framework can assist policy makers and regulators on the strategic role of microgrids for energy system planning and policy developments, including design of ancillary services markets not only to enhance system reliability but also resilience.
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