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On Hydraulic Constraints in Control of District Heating Systems

Agner, Felix LU (2023) In Research Reports TFRT-3279
Abstract
District heating systems make an important puzzle piece in the energy system of both today and tomorrow. When designing, simulating and controlling these systems, hydraulics play a vital role. The pressure generated by pumps has to drive sufficient flow throughout the system to satisfy the requirements of customers. Ensuring that the system is sufficiently pressurized is a challenging task already in current systems, and may become even more challenging in the transition to the 4th generation of district heating.
In the first paper of this thesis, a demand response framework is suggested, which distributes the available flow to customers in a fair way. The framework aims to make it so that when the available pressure in the network is... (More)
District heating systems make an important puzzle piece in the energy system of both today and tomorrow. When designing, simulating and controlling these systems, hydraulics play a vital role. The pressure generated by pumps has to drive sufficient flow throughout the system to satisfy the requirements of customers. Ensuring that the system is sufficiently pressurized is a challenging task already in current systems, and may become even more challenging in the transition to the 4th generation of district heating.
In the first paper of this thesis, a demand response framework is suggested, which distributes the available flow to customers in a fair way. The framework aims to make it so that when the available pressure in the network is low, the buildings in the periphery should still be able to satisfy their heating needs.
The second paper of this thesis extends previous methods for identifying greybox parameters for hydraulic district heating models. Previous methods of this type rely on more measurement points, and do not include the influence of the control valves situated in customer substations. These model parameters can then be used for simulation or control purposes.
Together, the results presented in this thesis provide tools for better dealing with the hydraulic limitations in district heating systems. At the end, future work is outlined which may further pave the way for improved control that takes hydraulic limitations into account. (Less)
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author
supervisor
organization
publishing date
type
Thesis
publication status
published
subject
in
Research Reports TFRT-3279
pages
65 pages
publisher
Department of Automatic Control, Lund University
ISSN
0280-5316
project
Scalable Control for Increased Flexibility in District Heating Networks
Scalable Control of Interconnected Systems
language
English
LU publication?
yes
id
15d7ba55-059f-44a9-835e-dbcfe3511e9a
date added to LUP
2023-03-07 15:52:43
date last changed
2023-03-31 08:56:46
@misc{15d7ba55-059f-44a9-835e-dbcfe3511e9a,
  abstract     = {{District heating systems make an important puzzle piece in the energy system of both today and tomorrow. When designing, simulating and controlling these systems, hydraulics play a vital role. The pressure generated by pumps has to drive sufficient flow throughout the system to satisfy the requirements of customers. Ensuring that the system is sufficiently pressurized is a challenging task already in current systems, and may become even more challenging in the transition to the 4th generation of district heating.<br/> In the first paper of this thesis, a demand response framework is suggested, which distributes the available flow to customers in a fair way. The framework aims to make it so that when the available pressure in the network is low, the buildings in the periphery should still be able to satisfy their heating needs.<br/> The second paper of this thesis extends previous methods for identifying greybox parameters for hydraulic district heating models. Previous methods of this type rely on more measurement points, and do not include the influence of the control valves situated in customer substations. These model parameters can then be used for simulation or control purposes.<br/> Together, the results presented in this thesis provide tools for better dealing with the hydraulic limitations in district heating systems. At the end, future work is outlined which may further pave the way for improved control that takes hydraulic limitations into account.}},
  author       = {{Agner, Felix}},
  issn         = {{0280-5316}},
  language     = {{eng}},
  note         = {{Licentiate Thesis}},
  publisher    = {{Department of Automatic Control, Lund University}},
  series       = {{Research Reports TFRT-3279}},
  title        = {{On Hydraulic Constraints in Control of District Heating Systems}},
  url          = {{https://lup.lub.lu.se/search/files/141920149/Felix_Agner_licentiate_corrected_version.pdf}},
  year         = {{2023}},
}