Comparison and error analysis of off-design and design models of energy hubs

The accuracy of the simulation model has a profound impact on the optimal operation of the energy hubs (EHs). However, in many articles, the constant model of the efficiency of equipment is adopted to formulate the operation system, which would probably lead to a simplification of the simulation mod...

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Main Authors: J. H. Zheng, Jun Huang, Shan Deng, Q. H. Wu, Mengshi Li, Xiaoxin Zhou, Zhaoxia Jing
Format: Article
Language:English
Published: China electric power research institute 2019-12-01
Series:CSEE Journal of Power and Energy Systems
Subjects:
Online Access:https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8735432
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spelling doaj-7d7d96efe10d47aa9a14b7481a57edfe2020-11-25T02:10:07ZengChina electric power research instituteCSEE Journal of Power and Energy Systems2096-00422096-00422019-12-015445446510.17775/CSEEJPES.2018.00630Comparison and error analysis of off-design and design models of energy hubsJ. H. Zheng0Jun Huang1Shan Deng2Q. H. Wu3Mengshi Li4Xiaoxin Zhou5Zhaoxia Jing6School of Electric Power Engineering, South China University of Technology, Guangzhou 510006, ChinaSchool of Electric Power Engineering, South China University of Technology, Guangzhou 510006, ChinaSchool of Electric Power Engineering, South China University of Technology, Guangzhou 510006, ChinaSchool of Electric Power Engineering, South China University of Technology, Guangzhou 510006, ChinaSchool of Electric Power Engineering, South China University of Technology, Guangzhou 510006, ChinaChina Electric Power Research Institute, Beijing 100192, ChinaSchool of Electric Power Engineering, South China University of Technology, Guangzhou 510006, ChinaThe accuracy of the simulation model has a profound impact on the optimal operation of the energy hubs (EHs). However, in many articles, the constant model of the efficiency of equipment is adopted to formulate the operation system, which would probably lead to a simplification of the simulation models. But, EHs are typically operated under off-design condition due to the fluctuations in cooling, heating, electricity requirement. Moreover, even though the off-design characteristics are considered, few studies have suggested comparing the differences between those two models by considering the operation cost. In order to assess the effect of the off-design characteristics of EH on the optimal operation accuracy in this paper, two test cases are performed on the fixed and variable load conditions, respectively. In addition, the individual effect of off-design characteristics of each equipment on the optimal operation cost of the EH is also investigated through four optimization runs. It is worth mentioning that the optimal operation problem of the EH considering the off-design characteristics and on-off status of the equipment is a mixed integer non-linear programming problem (MINLP). By testing the design and off-design models on the two cases, the results of simulation demonstrate that the optimal operation cost for the off-design model is larger than that for the design model. Nonetheless, in the aspect of the authenticity of the system operation strategy, the off-design model performs better than the design model. Furthermore, a larger relative error of the system operation cost between the two models can be observed when the EH is operated under a relatively lower load condition, revealing that the influence of off-design characteristic on the optimal operation of EHs is too significant to be neglected.https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8735432designenergy hubsminlpoff-designoptimal operation
collection DOAJ
language English
format Article
sources DOAJ
author J. H. Zheng
Jun Huang
Shan Deng
Q. H. Wu
Mengshi Li
Xiaoxin Zhou
Zhaoxia Jing
spellingShingle J. H. Zheng
Jun Huang
Shan Deng
Q. H. Wu
Mengshi Li
Xiaoxin Zhou
Zhaoxia Jing
Comparison and error analysis of off-design and design models of energy hubs
CSEE Journal of Power and Energy Systems
design
energy hubs
minlp
off-design
optimal operation
author_facet J. H. Zheng
Jun Huang
Shan Deng
Q. H. Wu
Mengshi Li
Xiaoxin Zhou
Zhaoxia Jing
author_sort J. H. Zheng
title Comparison and error analysis of off-design and design models of energy hubs
title_short Comparison and error analysis of off-design and design models of energy hubs
title_full Comparison and error analysis of off-design and design models of energy hubs
title_fullStr Comparison and error analysis of off-design and design models of energy hubs
title_full_unstemmed Comparison and error analysis of off-design and design models of energy hubs
title_sort comparison and error analysis of off-design and design models of energy hubs
publisher China electric power research institute
series CSEE Journal of Power and Energy Systems
issn 2096-0042
2096-0042
publishDate 2019-12-01
description The accuracy of the simulation model has a profound impact on the optimal operation of the energy hubs (EHs). However, in many articles, the constant model of the efficiency of equipment is adopted to formulate the operation system, which would probably lead to a simplification of the simulation models. But, EHs are typically operated under off-design condition due to the fluctuations in cooling, heating, electricity requirement. Moreover, even though the off-design characteristics are considered, few studies have suggested comparing the differences between those two models by considering the operation cost. In order to assess the effect of the off-design characteristics of EH on the optimal operation accuracy in this paper, two test cases are performed on the fixed and variable load conditions, respectively. In addition, the individual effect of off-design characteristics of each equipment on the optimal operation cost of the EH is also investigated through four optimization runs. It is worth mentioning that the optimal operation problem of the EH considering the off-design characteristics and on-off status of the equipment is a mixed integer non-linear programming problem (MINLP). By testing the design and off-design models on the two cases, the results of simulation demonstrate that the optimal operation cost for the off-design model is larger than that for the design model. Nonetheless, in the aspect of the authenticity of the system operation strategy, the off-design model performs better than the design model. Furthermore, a larger relative error of the system operation cost between the two models can be observed when the EH is operated under a relatively lower load condition, revealing that the influence of off-design characteristic on the optimal operation of EHs is too significant to be neglected.
topic design
energy hubs
minlp
off-design
optimal operation
url https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8735432
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