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A power market-based operation support model for sub-daily hydropower regulation practices
Water, Energy and Environmental Engineering Research Unit, University of Oulu, PO Box 4300, 90014, Finland.
Water, Energy and Environmental Engineering Research Unit, University of Oulu, PO Box 4300, 90014, Finland.
KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Resources, Energy and Infrastructure.ORCID iD: 0000-0003-2716-4446
Finnish Environment Institute (SYKE), Latokartanonkaari 11, Helsinki 00790, Finland.
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2019 (English)In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 255, article id 113905Article in journal (Refereed) Published
Abstract [en]

With increasing power production from renewable energy sources, sub-daily variations in energy demand need to be balanced. Today, hydropower is commonly used as balancing power. In this study, we quantified the impact of capacity constraints, in terms of reservoir volume and hydropower capacity, on the potential to comply with instant energy demand. To evaluate the impact, we developed two new metrics, power market impact and system efficiency ratio, which are based on two threshold flow regimes derived from natural flow as lower threshold release and regulated flow (based on hourly energy prices) as upper threshold release. The operation support model comprises 96 different regulation scenarios based on varying combinations of hydropower and reservoir capacities. For each scenario, an hourly water balance was simulated, to obtain the highest complying with upper threshold release based on actual energy demand. We tested the framework on the Kemijoki river with defined thresholds based on the natural flow regime (tributary river Ounasjoki) and the hourly energy price in Finland in 2017, and estimated the impact of regulation on hourly flow regime at the Taivalkoski hydropower station. The annual flow regime impact in 2013, 2014 and 2015 was estimated to be 74%, 84% and 61%, respectively, while the monthly impact varied from 27% to 100%. Our framework for evaluating interactions between the power market and sub-daily regulation practices is a useful novel tool for sustainable river management and can be easily applied to different rivers and regions and evaluated for different timescales.

Place, publisher, year, edition, pages
Elsevier Ltd , 2019. Vol. 255, article id 113905
Keywords [en]
Flow regime alteration, Hydropeaking, Power market, Renewable energy, River regulation, Sub-daily variation, Commerce, Energy management, Hydroelectric power, Reservoirs (water), Rivers, Daily variations, Flow regimes, Renewable energies, Power markets, alternative energy, demand analysis, energy market, flow regulation, hydrological regime, power generation, regulatory framework, river management, threshold, water budget, Finland, Kemijoki River, Lappi [Finland]
National Category
Water Engineering Infrastructure Engineering Energy Systems
Research subject
Land and Water Resources Engineering
Identifiers
URN: urn:nbn:se:kth:diva-263474DOI: 10.1016/j.apenergy.2019.113905ISI: 000497978100121Scopus ID: 2-s2.0-85072215037OAI: oai:DiVA.org:kth-263474DiVA, id: diva2:1375833
Note

QC 20191206

Available from: 2019-12-06 Created: 2019-12-06 Last updated: 2020-01-13Bibliographically approved

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Riml, Joakim

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