A study on steam cycle optimization for integrating energy storage system to nuclear power plant

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As the share of renewable energy will be increasing, there is a growing interest in flexible power sources and energy storage systems due to the intermittent nature of renewable energy. We propose the Energy Storage System (ESS) integrated Nuclear Power Plant (NPP) as a solution. The system operates on load-following by branching the mass flow from the steam cycle to the ESS without changing the reactor thermal output. However, the merging point can be different for heat storing ESS and work storing ESS because the outlet conditions of the ESS vary depending on the type of ESS. In this study, the merging points are categorized into two types, feedwater heater and condenser. At each merging point, cycle optimization is performed while increasing the branch flow into ESS. The optimization goal is to maintain the feedwater temperature at the inlet of a steam generator. The power output and energy delivered to the ESS according to the merging point are estimated. From this study, it was found that when 25% of the inlet mass flow rate to the low-pressure turbine is diverted to ESS, the overall output of the steam cycle is decreased by 44.17% for the heat conversion ESS and 49.95% for the work conversion ESS.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2021-09
Language
English
Article Type
Article
Citation

ANNALS OF NUCLEAR ENERGY, v.160, pp.108349

ISSN
0306-4549
DOI
10.1016/j.anucene.2021.108349
URI
http://hdl.handle.net/10203/286149
Appears in Collection
NE-Journal Papers(저널논문)
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