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Heat-power peak shaving and wind power accommodation of combined heat and power plant with thermal energy storage and electric heat pump
Dalian University of Technology, China; Aalto University, Finland.
Dalian University of Technology, China.
Henan Provincial Investment Company, China.
Stage Grid Liaoning Electric Power Supply CO LTD, China.
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2023 (English)In: Energy Conversion and Management, ISSN 0196-8904, E-ISSN 1879-2227, Vol. 297, article id 117732Article in journal (Refereed) Published
Abstract [en]

Wind power curtailment becomes a major problem in many countries. The wind accommodation mechanisms and energy saving potentials for the combined heat and power plant with thermal energy storage, electric heat pump and both should be evaluated more systematically and accurately to accommodate more wind power. Heat-power peak shaving capacities for thermal energy storage, electric heat pump and both are analyzed using a graphical method, while the operation strategy is proposed to maximize wind accommodation. A simulation model for wind power accommodation considering the energy balances and constraints of all production units is developed based on EnergyPRO. A regional energy supply system in Jilin Province, China is selected as the case study, where the influences of different peak shaving technologies and their parameters on the wind accommodation and energy saving are studied. The wind curtailment ratio is reduced from 20.31% to 13.04% and 7.51% with thermal energy storage and electric heat pump respectively, and it is further reduced to 4.21% with both. Systems with electric heat pump can save energy from 1.1% to 5.8% with different parameters of the peak shaving devices. It was found that electric heat pump has better accommodation capability than that of thermal energy storage. Wind accommodation can be improved by adding thermal energy storage to electric heat pump, but the effect gradually decreases as the storage size increases. Electric heat pump can increase the system’s energy efficiency, but it is not always energy efficient by adding thermal energy storage to electric heat pump. In fact, thermal energy storage should not be too large, otherwise the system’s energy efficiency will be reduced. 

Place, publisher, year, edition, pages
Elsevier Ltd , 2023. Vol. 297, article id 117732
Keywords [en]
Cogeneration plants; Electric energy storage; Energy efficiency; Heat pump systems; Heat storage; Pumps; Wind power; Energy savings; Energy-savings; Heat power; Heat pumps; Heat-power decoupling; Peak-shaving; Power decoupling; Thermal energy storage; Wind curtailment; Wind power accommodations; Thermal energy
National Category
Energy Engineering
Identifiers
URN: urn:nbn:se:ri:diva-67691DOI: 10.1016/j.enconman.2023.117732Scopus ID: 2-s2.0-85173264771OAI: oai:DiVA.org:ri-67691DiVA, id: diva2:1809520
Note

This work was supported by the China national key research and development program – China-Finland intergovernmental cooperation in science and technology innovation (Funding No. 2021YFE0116200), academy research fellow funding from research council of Finland (Funding No. 336268 and 358055). We also thank Stage Grid Liaoning Electric Power Supply CO. LTD for providing valuable data about wind power.

Available from: 2023-11-03 Created: 2023-11-03 Last updated: 2024-04-04Bibliographically approved

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Abdollahi, Elnaz

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