Interactions analysis between VSC converters and an onshore AC network

This thesis starts by addressing two modelling techniques for power systems in qd0-domain. The first technique is the state-space representation, which describes the behaviour of a physical system by means of its state variables in the time domain. The second modelling technique is the admittance ma...

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Detalhes bibliográficos
Autor: Collart Kuen Louie, Rosell
Formato: tesis de maestría
Fecha de publicación:2019
País:España
Recursos:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/174903
Acesso em linha:https://hdl.handle.net/2117/174903
Access Level:acceso abierto
Palavra-chave:Electric current converters
Electric networks
Convertidors de corrent elèctric
Xarxes elèctriques
Àrees temàtiques de la UPC::Enginyeria elèctrica
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spelling Interactions analysis between VSC converters and an onshore AC networkCollart Kuen Louie, RosellElectric current convertersElectric networksConvertidors de corrent elèctricXarxes elèctriquesÀrees temàtiques de la UPC::Enginyeria elèctricaThis thesis starts by addressing two modelling techniques for power systems in qd0-domain. The first technique is the state-space representation, which describes the behaviour of a physical system by means of its state variables in the time domain. The second modelling technique is the admittance matrix, which expresses the voltage-current relationship of the system as a transfer function in the frequency s-domain. The main reason for using these two techniques is because both are equivalent, allows to model the same system in two different ways providing different insights. This is an important point because every modelling technique has its own drawbacks and benefits in terms of derivation and information that they can provide. Deriving properly the model is crucial for studying the behaviour of the system under any condition of operation. The power network studied in this thesis is comprised by seven overhead power lines interconnecting five buses, this power network is addressed by the name of " Five Bus Network". The state-space model and admittance matrix model of the five Bus network is derived and compared on the basis of eigenvalues and singular values. Later, a voltage source converter (VSC) is connected to the power system. The power system in this thesis is comprised by a grid-connected VSC converter, an equivalent network and the five bus network. The control system of the VSC converter is described and properly validated to ensure its correct operation. The two main studied interactions between the VSC converter and the power network are related to the strength of the equivalent network and the disconnection of a power transmission line. The strength of an AC grid is normally defined by the short circuit ratio (SCR), which has negative effects on the stability of the control system of the converter. Also, the loss of a power line imposes newconstraints on the system and changes drastically the topology of the network. The simulations are performed inMATLAB-SIMULINK. Two models are created to capture the dynamics of the system. The first is a non-linear model created in SIMULINK (VSC converter and the AC grid) and the second is a linear model (VSC converter and the AC grid) based on the state space representation. The linear model is validated to assure that matches the nonlinear model whenever a small perturbation in the system occurs. Results are expressed in time-domain and in the frequency s-domain. Finally, the obtained results shows the impact of low SCRs on the stability of the system. The lower the SCR, the more prone the system is to become unstable. On the other hand, the loss of a power line limits the power transfer capabilities between the converter and the network. And if proper power adjustments are not made the system could become unstable.Universitat Politècnica de CatalunyaPrieto Araujo, EduardoOrellana Montaño, Luis Carlos20192019-10-0920202020-01-15master thesishttp://purl.org/coar/resource_type/c_bdccNAhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43info:eu-repo/semantics/masterThesisapplication/pdfhttps://hdl.handle.net/2117/174903reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2http://creativecommons.org/licenses/by-nc-sa/3.0/es/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/1749032026-05-27T15:37:01Z
dc.title.none.fl_str_mv Interactions analysis between VSC converters and an onshore AC network
title Interactions analysis between VSC converters and an onshore AC network
spellingShingle Interactions analysis between VSC converters and an onshore AC network
Collart Kuen Louie, Rosell
Electric current converters
Electric networks
Convertidors de corrent elèctric
Xarxes elèctriques
Àrees temàtiques de la UPC::Enginyeria elèctrica
title_short Interactions analysis between VSC converters and an onshore AC network
title_full Interactions analysis between VSC converters and an onshore AC network
title_fullStr Interactions analysis between VSC converters and an onshore AC network
title_full_unstemmed Interactions analysis between VSC converters and an onshore AC network
title_sort Interactions analysis between VSC converters and an onshore AC network
dc.creator.none.fl_str_mv Collart Kuen Louie, Rosell
author Collart Kuen Louie, Rosell
author_facet Collart Kuen Louie, Rosell
author_role author
dc.contributor.none.fl_str_mv Prieto Araujo, Eduardo
Orellana Montaño, Luis Carlos
dc.subject.none.fl_str_mv Electric current converters
Electric networks
Convertidors de corrent elèctric
Xarxes elèctriques
Àrees temàtiques de la UPC::Enginyeria elèctrica
topic Electric current converters
Electric networks
Convertidors de corrent elèctric
Xarxes elèctriques
Àrees temàtiques de la UPC::Enginyeria elèctrica
description This thesis starts by addressing two modelling techniques for power systems in qd0-domain. The first technique is the state-space representation, which describes the behaviour of a physical system by means of its state variables in the time domain. The second modelling technique is the admittance matrix, which expresses the voltage-current relationship of the system as a transfer function in the frequency s-domain. The main reason for using these two techniques is because both are equivalent, allows to model the same system in two different ways providing different insights. This is an important point because every modelling technique has its own drawbacks and benefits in terms of derivation and information that they can provide. Deriving properly the model is crucial for studying the behaviour of the system under any condition of operation. The power network studied in this thesis is comprised by seven overhead power lines interconnecting five buses, this power network is addressed by the name of " Five Bus Network". The state-space model and admittance matrix model of the five Bus network is derived and compared on the basis of eigenvalues and singular values. Later, a voltage source converter (VSC) is connected to the power system. The power system in this thesis is comprised by a grid-connected VSC converter, an equivalent network and the five bus network. The control system of the VSC converter is described and properly validated to ensure its correct operation. The two main studied interactions between the VSC converter and the power network are related to the strength of the equivalent network and the disconnection of a power transmission line. The strength of an AC grid is normally defined by the short circuit ratio (SCR), which has negative effects on the stability of the control system of the converter. Also, the loss of a power line imposes newconstraints on the system and changes drastically the topology of the network. The simulations are performed inMATLAB-SIMULINK. Two models are created to capture the dynamics of the system. The first is a non-linear model created in SIMULINK (VSC converter and the AC grid) and the second is a linear model (VSC converter and the AC grid) based on the state space representation. The linear model is validated to assure that matches the nonlinear model whenever a small perturbation in the system occurs. Results are expressed in time-domain and in the frequency s-domain. Finally, the obtained results shows the impact of low SCRs on the stability of the system. The lower the SCR, the more prone the system is to become unstable. On the other hand, the loss of a power line limits the power transfer capabilities between the converter and the network. And if proper power adjustments are not made the system could become unstable.
publishDate 2019
dc.date.none.fl_str_mv 2019
2019-10-09
2020
2020-01-15
dc.type.none.fl_str_mv master thesis
http://purl.org/coar/resource_type/c_bdcc
NA
http://purl.org/coar/version/c_be7fb7dd8ff6fe43
dc.type.openaire.fl_str_mv info:eu-repo/semantics/masterThesis
format masterThesis
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/174903
url https://hdl.handle.net/2117/174903
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2

http://creativecommons.org/licenses/by-nc-sa/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2

http://creativecommons.org/licenses/by-nc-sa/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universitat Politècnica de Catalunya
publisher.none.fl_str_mv Universitat Politècnica de Catalunya
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.301603

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