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Comparison of contr...
Comparison of control approaches for variable speed air source heat pumps considering time variable electricity prices and PV
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- Fischer, David (författare)
- Fraunhofer Institute for Solar Energy Systems, Germany
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Bernhardt, J. (författare)
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- Madani, Hatef (författare)
- KTH,Tillämpad termodynamik och kylteknik
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Wittwer, C. (författare)
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(creator_code:org_t)
- Elsevier, 2017
- 2017
- Engelska.
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Ingår i: Applied Energy. - : Elsevier. - 0306-2619 .- 1872-9118. ; 204, s. 93-105
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The influence of different control strategies and boundary conditions on heat pump system performance are investigated in this study and the trade-off between complexity and performance of different controllers is addressed. For this purpose five different control approaches for a variable speed air source heat pump in a multi family house are compared for three different use-cases. The used controls differ in complexity and the use of external input data like price and weather forecasts. The use-cases are: Constant electricity prices, time variable electricity prices and PV self-consumption. Four different rule-based controllers are compared to a convex MPC approach, presented in this work. Results show that the MPC approach reduces annual operating cost by 6–11% for constant electricity prices and 6–16% in the case of variable electricity prices. Rule-based approaches lead to cost reductions of 2–4%. MPC could increases PV self-consumption from 56% to 58% up to 64–71%. The rule base approaches are found computationally less demanding and easier to design. However fine-tuning has been considerable work and with changing boundary conditions rules had to be readjusted. It showed that increasing thermal storage without MPC is not beneficial and optimised controls are a prerequisite to benefit from increased storage sizes.
Ämnesord
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Energiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Energy Engineering (hsv//eng)
Nyckelord
- Heat pumps
- Model predictive controls
- PV self-consumption
- Rule-base controls
- Thermal storage
- Variable electricity prices
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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