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Distributed Heating Networks

Alisic, Rijad (2018)
Department of Automatic Control
Abstract
There is a shortage of models and analysis methods of fourth generation district heating networks, which are capable of both extracting and depositing heat energy to some thermal network grid. This thesis fills that gap by combining mathematical models of components into a network that is capable of sending heat energy between its nodes. Questions regarding good heating strategies for controlling the nodes were posed, and based on these, some simplifications were made to produce simpler systems to work with. Near-optimal distributed control strategies were produced and tested on simulations of the full mathematical models. For comparison, tuned P- and PI-controllers were also simulated on the full system. The results showed that the... (More)
There is a shortage of models and analysis methods of fourth generation district heating networks, which are capable of both extracting and depositing heat energy to some thermal network grid. This thesis fills that gap by combining mathematical models of components into a network that is capable of sending heat energy between its nodes. Questions regarding good heating strategies for controlling the nodes were posed, and based on these, some simplifications were made to produce simpler systems to work with. Near-optimal distributed control strategies were produced and tested on simulations of the full mathematical models. For comparison, tuned P- and PI-controllers were also simulated on the full system. The results showed that the optimal controllers induce less oscillations and had less stationary error, however this caused larger control signals and more grid-wise interaction, causing neighboring users to feel more of the impact when a single node changed its operating point. This effect can be suppressed if a heating battery is connected to the system. (Less)
Please use this url to cite or link to this publication:
author
Alisic, Rijad
supervisor
organization
year
type
H3 - Professional qualifications (4 Years - )
subject
report number
TFRT-6063
ISSN
0280-5316
language
English
id
8953462
date added to LUP
2018-06-29 12:18:20
date last changed
2019-06-12 11:37:32
@misc{8953462,
  abstract     = {There is a shortage of models and analysis methods of fourth generation district heating networks, which are capable of both extracting and depositing heat energy to some thermal network grid. This thesis fills that gap by combining mathematical models of components into a network that is capable of sending heat energy between its nodes. Questions regarding good heating strategies for controlling the nodes were posed, and based on these, some simplifications were made to produce simpler systems to work with. Near-optimal distributed control strategies were produced and tested on simulations of the full mathematical models. For comparison, tuned P- and PI-controllers were also simulated on the full system. The results showed that the optimal controllers induce less oscillations and had less stationary error, however this caused larger control signals and more grid-wise interaction, causing neighboring users to feel more of the impact when a single node changed its operating point. This effect can be suppressed if a heating battery is connected to the system.},
  author       = {Alisic, Rijad},
  issn         = {0280-5316},
  language     = {eng},
  note         = {Student Paper},
  title        = {Distributed Heating Networks},
  year         = {2018},
}