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Dissertations / Theses on the topic 'HVDC Transmission'

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Published: 4 June 2021

Last updated: 26 July 2025

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1

Moberg, Désirée. "Transmission alternatives for grid connection of large offshore wind farms at large distance." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-65804.

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With the great possibility of offshore wind power that can be installed in the world seas, offshore wind power is starting to get and important source of energy. The growing sizes of wind turbines and a growing distance to land, makes the choice of transmission alternative to a more important factor. The profitability of the transmission solution is affected by many parameters, like investment cost and power losses, but also by parameters like operation & maintenance and lead time of the system. The study is based on a planned wind farm with a rated power of 1 200 MW and at a distance of 1

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2

Babazadeh, Davood. "Distributed Control of HVDC Transmission Grids." Doctoral thesis, KTH, Elkraftteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-202753.

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Recent issues such as priority access of renewable resources recommended by European energy directives and increase the electricity trading among countries lead to new requirements on the operation and expansion of transmission grids. Since AC grid expansions are limited by legislative issues and long distance transmission capacity, there is a considerable attention drawn to application of HVDC transmission grids on top of, or in complement to, existing AC power systems. The secure operation of HVDC grids requires a hierarchical control system. In HVDC grids, the primary control action to deal

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3

Bradley, M. E. "An advanced thyristor valve for HVDC transmission." Thesis, Aston University, 1988. http://publications.aston.ac.uk/15135/.

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The development of an advanced outdoor valve requires coordinated research in the areas of light-triggered self-protecting thyristors, light triggering systems, insulation, cooling and mechanical design aspects. This thesis addresses the first two areas primarily, with a conceptual discussion of the remainder. Using the experience gained from evaluation of a prototype thyristor and computer IKdelling of turn-on behaviour, a light-triggered thyristor with immunity to damage from weak optical triggering and dv/dt triggering was designed, manufactured and evaluated. The optical turn-on process wa

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4

Eriksson, Robert. "Coordinated Control of HVDC Links in Transmission Systems." Doctoral thesis, KTH, Elektriska energisystem, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-30625.

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Dynamic security limits the power transfer capacity between regions and therefore has an economic impact. The power modulation control of high-voltage direct current (HVDC) links can improve the dynamic security of the power system. Having several HVDC links in a system creates the opportunity to coordinate such control, and coordination also ensures that negative interactions do not occur among the controllable devices. This thesis aims to increase dynamic security by coordinating HVDC links, as an alternative to decreasing the transfer capacity. This thesis contributes four control approache

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5

Esmaeelnezhad, Ali. "Stochastic long-term transmission expansion planning with HVDC links." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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The ever-increasing load demand all across the world has led to increasing the demand for energy. The major part of this demand is supplied through conventional power plants with fossil fuels. Recently, the concern on environmental emissions has increased, which in turn put pressure on power systems as one of the main sectors in contributing to environmental emissions. Accordingly, different countries have started installing renewable energies to alleviate these concerns and mitigate environmental emissions. These green technologies have been being installed either as centralized plants, for e

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6

Nazari, Mohammad. "Control and Planning of Multi-Terminal HVDC Transmission Systems." Doctoral thesis, KTH, Elkraftteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-213988.

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With recent advances in power electronic technology, high-voltage direct current (HVDC) transmission system has become an alternative for transmitting power, especially over long distances. Multi-terminal HVDC (MTDC) systems are proposed as HVDC systems with more than two terminals. In addition, the wind is becoming one of the most important sources of renewable energy in the world, with vast sources available in offshore areas. MTDC systems are attractive solutions for connecting offshore wind farms to AC grids. This thesis discusses three scopes of MTDC systems: primary control, secondary

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7

Stevens, Jonathan. "HVDC transmission and AC hubs for offshore wind generation." Thesis, Cardiff University, 2015. http://orca.cf.ac.uk/87531/.

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The offshore AC hub was identified as a feasible network topology for an offshore node applied in a future pan-European Supergrid. A model of an offshore AC hub was developed in SimPowerSystemsTM using the round three offshore wind development zone Dogger Bank, as a case study. Two control philosophies, master-slave and droop control, are shown to successfully manage the voltage, current and complex power flow in the offshore AC hub following planned changes in operating conditions. The impacts of three different fault scenarios on the offshore AC hub are investigated. It is shown that each fa

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8

Shehata, S. A. M. "Analysis of stresses in the cross channel HVDC link transition joint." Thesis, University of Southampton, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356531.

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9

Fitton, Colin Robert. "Mathematical modelling of balanced and unbalanced HVDC power transmission links." Thesis, Loughborough University, 1988. https://dspace.lboro.ac.uk/2134/9033.

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In high voltage direct current power transmission, the need to filter the non-sinusoidal current wave forms drawn by the converters from the ac supply has long been acknowledged. Assessment of the harmonic content of these waveforms to the best accuracy possible is a desirable objective to aid filter design. The conventional analytical technique necessitates making simplifying assumptions and produces only approximate results. Such practical considerations as system unbalance cannot be taken into account. The objective of the research was to perform in-depth analyses of hvdc transmission links

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10

Valdenmaiier, Georgii, and Mehrdad Kazemtabrizi. "Validation of CIM DC load model for HVDC transmission systems." Thesis, KTH, Industriella informations- och styrsystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160166.

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11

Mohamed, Ramadan Haitham Saad. "Non-linear control and stabilization of VSC-HVDC transmission systems." Thesis, Paris 11, 2012. http://www.theses.fr/2012PA112046/document.

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L'intégration des liaisons à courant continu dans les systèmes électriques permet d’accroitre les possibilités de pilotage des réseaux, ce qui permet d’en améliorer la sûreté et de raccorder de nouveaux moyens de production. Pour cela la technologie VSC-HVDC est de plus en plus plébiscitée pour interconnecter des réseaux non synchrones, raccorder des parcs éoliens offshore, ou contrôler le flux d’énergie notamment sur des longues distances au travers de liaisons sous-marines (liaison NorNed). Les travaux de cette thèse portent sur la modélisation, la commande non-linéaire et la stabilisation d

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12

Daryabak, Mehdi. "Modeling line-commutated converter HVDC transmission systems using dynamic phasors." IEEE, 2013. http://hdl.handle.net/1993/31632.

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This thesis develops the dynamic phasor model of a line-commutated converter (LCC) high-voltage direct current (HVDC) transmission system. The mathematical definition and properties of dynamic phasors are utilized to model both the dc-side and the ac-side of a LCC-HVDC transmission system as well as 6-pulse Graetz bridge, which is the building block of such a system. The developed model includes low-frequency dynamics of the systems, i.e., fundamental frequency component (50 Hz) at the ac-side and dc component at the dc-side, and removes high-frequency transients. The developed model, however

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13

Pipelzadeh, Yousef. "Coordination of damping control in transmission networks with HVDC links." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/9982.

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The primary goal of this thesis is to investigate the small-signal stability of transmission networks with wind generation and high voltage direct current (HVDC) transmission integrated in them. The topic reflects a number of concerns of transmission network operators in the U.K. and beyond over how stability is maintained as networks evolve. Damping low frequency power oscillations using wide-area signals are illustrated for both line commutated based current source converter (interchangeably referred as LCC or CSC) and self commutated voltage sourced converter (VSC) based HVDC links integrat

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14

Latorre, Hector. "Modeling and Control of VSC-HVDC Transmissions." Doctoral thesis, KTH, Elektriska energisystem, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-32313.

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Presently power systems are being operated under high stress level conditions unforeseen at the moment they were designed. These operating conditions have negatively impacted reliability, controllability and security margins. FACTS devices and HVDC transmissions have emerged as solutions to help power systems to increase the stability margins. VSC-HVDC transmissions are of particular interest since the principal characteristic of this type of transmission is its ability to independently control active power and reactive power. This thesis presents various control strategies to improve damping

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15

Gonzalez-Torres, Juan Carlos. "Transient stability of high voltage AC-DC electric transmission systems." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS041.

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Les nouvelles politiques adoptées par les autorités nationales ont encouragé pendant les dernières années l'intégration à grande échelle des systèmes d'énergie renouvelable (RES). L'intégration à grande échelle des RES aura inévitablement des conséquences sur le réseau de transport d'électricité tel qu'il est conçu aujourd'hui, car le transport de l'électricité massif sur de longues distances pourrait amener les réseaux de transport à fonctionner près de leurs limites, réduisant ainsi leurs marges de sécurité. Des systèmes de transport d’électricité plus complexes seront donc nécessaires.Dans

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16

Thepparat, Pakorn. "Analysis of the combined and coordinated control method for HVDC transmission." Aachen Shaker, 2010. http://d-nb.info/1001789059/04.

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17

Norheim, Ian. "Suggested Methods for Preventing Core Saturation Instability in HVDC Transmission Systems." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, 2002. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-207.

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<p>In this thesis a study of the HVDC related phenomenon core saturation instability and methods to prevent this phenomenon is performed. It is reason to believe that this phenomenon caused disconnection of the Skagerrak HVDC link 10 August 1993. Internationally, core saturation instability has been reported at several HVDC schemes and thorough complex studies of the phenomenon has been performed. This thesis gives a detailed description of the phenomenon and suggest some interesting methods to prevent the development of it.</p><p>Core saturation instability and its consequences can be describ

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18

Haileselassie, Temesgen Mulugeta. "Control, Dynamics and Operation of Multi-terminal VSC-HVDC Transmission Systems." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19912.

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In recent years, there has been an increased development and deployment of renewable energy resources to meet the ever increasing electric power demand and to limit the use of fossil fuels. This has spurred offshore wind farm development, particularly in the North Sea, due to the vast offshore wind energy potential. Large scale wind farms in the North Sea pose grid integration challenges such as the need for long distance sub sea power transmission and managing the variability of wind power variation on in the power grid. These challenges can be properly met by the use of multi-terminal voltag

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19

Villablanca, Miguel. "High pulse AC/DC convertors and their application to HVDC transmission." Thesis, University of Canterbury. Electrical Engineering, 1992. http://hdl.handle.net/10092/5741.

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AC/DC convertors used in HVdc transmission systems inject harmonics into their associated AC and DC systems. A conventional approach to filter these harmonics is to use passive filters on both AC and DC sides of the convertor. Apart from their technical problems, harmonic filters constitute a considerable part of the volume and cost of present DC terminal stations. Another possible alternative of harmonic suppression is to increase the number of pulses of AC/DC convertors by transformer phase-shifting techniques, but the resulting complicated circuitry together with its problems of insulation

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20

Nazari, Mohammad. "Control of DC voltage in Multi-Terminal HVDC Transmission (MTDC) Systems." Licentiate thesis, KTH, Elektriska energisystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-147551.

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With recent advances in power electronic technology, High-Voltage Direct Current (HVDC) transmission system has become an alternative for transmitting power especially over long distances. Multi-Terminal HVDC (MTDC) systems are proposed as HVDC systems with more than two terminals. These systems can be geographically wide. While in AC grids, frequency is a global variable, in MTDC systems, DC voltage can be considered as its dual. However, unlike frequency, DC voltage can not be equal across the MTDC system. Control of DC voltage in MTDC systems is one of the important challenges in MTDC syste

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21

Mohamed, Ramadan Haitham Saad. "Commande non linéaire et stabilisation des systèmes de transmission VSC-HVDC." Phd thesis, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00707721.

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L'intégration des liaisons à courant continu dans les systèmes électriques permet d'accroitre les possibilités de pilotage des réseaux, ce qui permet d'en améliorer la sûreté et de raccorder de nouveaux moyens de production. Pour cela la technologie VSC-HVDC est de plus en plus plébiscitée pour interconnecter des réseaux non synchrones, raccorder des parcs éoliens offshore, ou contrôler le flux d'énergie notamment sur des longues distances au travers de liaisons sous-marines (liaison NorNed). Les travaux de cette thèse portent sur la modélisation, la commande non-linéaire et la stabilisation d

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22

Rafferty, John. "DC grid management and transient analysis of multi-terminal HVDC transmission." Thesis, Queen's University Belfast, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.677286.

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With the advent of large scale offshore wind generation the world has taken a significant step closer to reducing its reliance on fossil fuels as the main source of electricity. To this end, plans in Europe have been proposed to interconnect a variety of renewable generation sources, predominantly wind sourced, via the construction of High Voltage DC lines into a Single Multi-Terminal DC (MTDC) grid, dubbed the European Supergrid, In order to meet a large portion of the total European demand. The object of this thesis is to address some of the issues involved with the Implementation of such a

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23

Tang, Yunpeng. "A novel N-phase multi-modular series HVDC tap." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/44134/.

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High-voltage direct-current (HVDC) transmission has higher efficiency and lower expenses for the long-distance bulk-power transmission. A HVDC tap is one type of the multi-terminal HVDC systems which transfers a small amount of power from the HVDC line to the nearby communities with no access to the electricity. Developed from the 1960s, HVDC taps can be summarised into series taps and parallel taps, between which series taps are considered to be more promising on the use of devices and the cost. The conventional series taps have some evident drawbacks, which a modular multilevel based series

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24

Condò, Marco. "Electrical characterization of innovative insulating materials for HVDC energy transmission cable systems." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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La tesi si è svolta nel corso di uno stage di quasi nove mesi all'interno del laboratorio elettrico di alta tensione del reparto R&D di Prysmian, leader mondiale dei sistemi elettrici in cavo. La tesi si è articolata nelle fasi seguenti: 1) analisi dei fondamenti teorici dei sistemi elettrici in cavo ad alta tensione in corrente continua (HVDC); 2) caratterizzazione elettrica di materiali isolanti innovativi per lo sviluppo di sistemi in cavo HVDC. Più in dettaglio tale caratterizzazione è consistita nelle fasi seguenti: a) progettazione e/o realizzazione dei set-up di prova; b) esecuzione

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25

Meier, Stephan. "Novel voltage source converter based HVDC transmission system for offshore wind farms." Licentiate thesis, KTH, School of Electrical Engineering (EES), 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-568.

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<p>Offshore wind farms have recently emerged as promising renewable energy sources. For increasing distances between offshore generation and onshore distribution grid, HVDC transmission systems based on voltage source converters can be a feasible and competitive solution. This thesis presents a comprehensive evaluation of a novel integrated wind farm topology that includes the generator drive system, the turbine interconnection and the HVDC transmission.</p><p>In the proposed concept, every wind turbine is connected to a single-phase medium-frequency collection grid via a distribution transfor

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26

Agha, Ebrahimi Mohammad R. "A GTO-based scheme for small power tapping from HVDC transmission systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/nq23579.pdf.

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27

Enright, Wade Grant. "Transformer models for electromagnetic transient studies with particular reference to HVdc transmission." Thesis, University of Canterbury. Department of Electrical and Electronic Engineering, 1996. http://hdl.handle.net/10092/3279.

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In this thesis a formulation for incorporating general magnetic equivalent circuits in electromagnetic transient programs is presented. The formulation is applied to create new single-phase, and the first three-limb three-phase PSCAD-EMTDC program transformer models. The new models proposed are validated with laboratory, factory, and field data. Problems associated with magnetically independent phase representations of three-limb three-phase transformers are discussed. Considerable differences are shown in the behaviour of three-phase bank and three-limb three-phase transformers, particularly

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28

Ikhide, Monday Aideloje. "DC line protection for multi-terminal High Voltage DC (HVDC) transmission systems." Thesis, Staffordshire University, 2017. http://eprints.staffs.ac.uk/4601/.

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The projected global energy shortage and concerns about greenhouse emissions have led to the significant developments in offshore wind farm projects around the globe. It is also envisaged that in the near future, a number of existing onshore converter stations and offshore stations will be interconnected to form a Multi-terminal (MT) HVDC systems, whereas protection issues remains a major challenge. This is largely due to the low inductance in DC network compared to AC interconnection which usually results in a sudden collapse in the DC voltage and rapid rise in the fault current thus reaching

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29

Wang, Hualei. "The protection of transmission networks containing AC and DC circuits." Thesis, University of Bath, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.655718.

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In 14th August 2003, the Northeast USA suffered its worst power outage event in history. The power disturbance spreading through the system caused mal-trips of the distance relay remote back-up protections, which indeed contributed to the power outage cascading a wide area. The power outage in the Northeast USA was constrained by the presence of HVDC interconnections between the HVAC networks in Ontario and New York. The system collapse did not progress beyond the HVDC interconnection interface with Quebec. The HVDC link can regulate the voltage and current therefore impacts on the performance

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30

Verdolin, Rogerio. "Overvoltages and coupling effects on an ac-dc hybrid transmission system." Canadian Electric Association Conference, 1995. http://hdl.handle.net/1993/5147.

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Abstract Adding a dc circuit to an existing transmission line is one method of significantly increasing the power transfer capability of a transmission corridor. The resulting hybrid system has significant coupling between the ac and dc circuits, not only because of the proximity of the circuits, but also from the fact that they may share the same sending end or receiving end ac systems. The resultant interaction produces overvoltages on the dc system which can be somewhat higher than for a conventional dc scheme. This thesis investigates the overvoltages on a hybrid ac-dc transmiss

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31

Thepparat, Pakorn [Verfasser]. "Analysis of the Combined and Coordinated Control Method for HVDC Transmission / Pakorn Thepparat." Aachen : Shaker, 2010. http://d-nb.info/1122546165/34.

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32

Pedroso, Felipe Rocha Velloso de Almeida. "Modelling and methodology apllied to evaluate multi-infeed performance of HVDC transmission systems." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-27042018-092616/.

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The Brazilian transmission system covers a large area, with a high concentration of consumer centres in the Southeast region and abundant hydro generation in the North. To connect these regions, some of the transmission lines might reach 2500 km length, creating a challenging situation. In this context, system planners have been defining the use of HVDC systems as the most feasible choice of transmission investment. It is so, recognized that the connections of power plants in the Northern region to the load centres in the Southeast will require a significant number of bipoles and, until the pr

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[Verfasser], Pakorn Thepparat. "Analysis of the Combined and Coordinated Control Method for HVDC Transmission / Pakorn Thepparat." Aachen : Shaker, 2010. http://nbn-resolving.de/urn:nbn:de:101:1-201701012279.

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34

Costa, de Oliveira Guacira. "Advances in multi-terminal HVDC transmission systems : nonlinear controllers for modular multilevel converters." Electronic Thesis or Diss., université Paris-Saclay, 2020. http://www.theses.fr/2020UPASG037.

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Le convertisseur modulaire à plusieurs niveaux est un sujet d'intérêt important et actuel dans le contexte des applications de systèmes de transmission haute tension à courant continu. Cette topologie convient à plusieurs applications, en raison de pertes de commutation plus faibles dues à une fréquence de commutation plus petite, à une faible distorsion harmonique de courant alternatif, à une structure modulaire permettant une construction évolutive, et une maintenance plus simple. Cependant, une stratégie de contrôle plus complexe est nécessaire pour contrôler le courant circulant, pour comp

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35

Suzuki, Nayara Yuko. "Estudo de controle e proteção para sistemas de transmissão HVDC multiterminais baseados em conversores modulares multiníveis." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-20092018-112205/.

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O crescente interesse por sistemas de transmissão do tipo VSC-based HVDC (VSCHVDC) como alternativa aos atuais tem levado à necessidade de estudos sobre o principal desafio associado à sua implantação, que é o desenvolvimento de um esquema de proteção que seja rápido e que identifique a zona de proteção na qual uma eventual falta tenha ocorrido, respeitando-se assim o princípio de seletividade. Para estudo de um sistema de proteção que atenda a estes requisitos, foi utilizada neste trabalho uma rede com quatro terminais e transmissão High-Voltage Direct Current (HVDC), implementada com convers

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36

Li, Xin. "Numerical analysis of ionized fields associated with HVDC transmission lines including effect of wind." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0010/NQ32001.pdf.

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Olsson, Johanna. "Implementation of Nodes in HVDC Grids." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-293884.

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This project is made for a deeper understanding ofhow frequency and amplitude of the waves that create the controlwave in a Pulse Width Modulated 2-level inverter affect the powerquality and power losses. The results were that a high frequencyreduces the Total Harmonic Distortion but increases the powerloss. The amplitude, however, reduces both the Total HarmonicDistortion and the power loss as it increases. All the analyseswere done in a simulation program called Simulink. The resultscan be applied when improving High Voltage Direct Currentinverters to develop a functional High Voltage Direct

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Poole, Richard. "Technical and economic analysis of connecting nuclear generation to the National Electricity Transmission System via HVDC technology." Thesis, University of Hertfordshire, 2016. http://hdl.handle.net/2299/17243.

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High Voltage Direct Current (HVDC) technology has never before been used to connect a Nuclear Power Plant (NPP) directly to the National Electricity Transmission System (NETS). There are both technical and economic factors which need to be considered and understood before such a technology is adopted for an NPP connection. In this thesis, both technical and economic factors surrounding the suitability of Current Source Converter (CSC) and Voltage Source Converter (VSC) HVDC technology for NPP connections are investigated. Power system models of both HVDC technologies, connected to an NPP, are

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39

Björk, Joakim. "Performance Quantification of Interarea Oscillation Damping Using HVDC." Licentiate thesis, KTH, Reglerteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-245223.

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With the transition towards renewable energy, and the deregulation of the electricity market, generation patterns and grid topology are changing. These changes increase the need for transfer capacity. One limiting factor, which sometimes leads to underutilization of the transmission grid, is interarea oscillations. These system-wide modes involve groups of generators oscillating relative to each other and are sometimes hard to control due to their scale and complexity. In this thesis we investigate how high-voltage direct current (HVDC) transmission can be used to attenuate interarea oscillati

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40

Fischer, de Toledo Paulo. "Modelling and control of a line-commutated HVDC transmission system interacting with a VSC STATCOM." Doctoral thesis, KTH, Elektriska maskiner och effektelektronik, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4492.

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The interaction of an HVDC converter with the connected power system is of complex nature. An accurate model of the converter is required to study these interactions. The use of analytical small-signal converter models provides useful insight and understanding of the interaction of the HVDC system and the connected system components. In this thesis analytical models of the HVDC converters are developed in the frequency-domain by calculating different transfer functions for small superimposed oscillations of voltage, current, and control signals. The objective is to study the dynamic proprietie

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Fischer, de Toledo Paulo. "Modeling and control of a line-commutated HVDC transmission system interacting with a VSC STATCOM : /." Stockholm : Elektrotekniska system, Kungliga Tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4492.

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42

Kaseke, R. "Development of corona-based power supplies for remote repeater stations for overhead HVDC power transmission systems." Thesis, University of Fort Hare, 2012. http://hdl.handle.net/10353/d1006787.

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More and more people worldwide are becoming “carbon conscious”. This means they are becoming increasingly aware of the imminent adverse effects of global warming. Of late there has been an urgent drive for governments to be on the forefront of all carbon mitigation initiatives. One such drive involves the United Nations Framework Convention on Climate Change whose parties have been meeting regularly under the banner of Conference of Parties (COP) since 1995. At this conference, parties to the convention review progress made in dealing with climate change. Also key to the deliberations in such

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Durrant, Martyn. "VSC HVDC power transmission control a case study in linear controller design for uncertain nonlinear plants." Aachen Shaker, 2007.

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Cho, Yongnam. "Modeling methodology of converters for HVDC systems and LFAC systems: integration and transmission of renewable energy." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/49064.

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The major achievements of this work are based on two categories: (A) introduction of an advanced simulation technique in both time domain and frequency domain, and (B) realistic and reliable models for converters applicable to analysis of alternative transmission systems. The proposed modeling-methodology using a combination of model quadratization and quadratic integration (QMQI) is demonstrated as a more robust, stable, and accurate method than previous modeling methodologies for power system analyses. The quadratic-integration method is free of artificial numerical-oscillations exhibited by

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Giraneza, Martial. "High voltage direct current (HVDC) in applications for distributed independent power providers (IPP)." Thesis, Cape Peninsula University of Technology, 2013. http://hdl.handle.net/20.500.11838/1077.

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Thesis submitted in fulfillment of the requirements for the degree Master of Technology: Electrical Engineering in the Faculty of Engineering at the Cape Peninsula University of Technology 2013<br>The development of power electronics did remove most of technical limitations that high voltage direct current (HVDC) used to have. HVDC, now, is mostly used for the transmission of bulk power over long distances and for the interconnection of asynchronous grid. Along with the development of the HVDC, the growth of power demand also increased beyond the utilities capacities. Besides the on-going incr

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Diban, Bassel. "Life Estimation of HVDC Cables Subjected to Qualification Test Conditions." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18955/.

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The goal of the Master Thesis is estimating the life of HVDC XLPE-insulated cables subjected to the Qualification Tests conditions according to CIGRÉ Technical Brochure 496 and for different values of the coefficients (a) and (b). During the Electrical Type Test (TT), a series of load cycles (LC) with DC voltage UT=1.85 U0 (rated voltage) are applied in three stages, i.e.: • 12 cycles lasting 24 hours each with a negative polarity of the applied voltage (12 days). • 12 cycles lasting 24 hours each with a positive polarity of the applied voltage (12 days). • 3 cycles lasting 48 hours each w

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Meah, Kala. "A self coordinating parallel multi-PI control scheme for an HVDC transmission system to accommodate a weak AC system." Laramie, Wyo. : University of Wyoming, 2007. http://proquest.umi.com/pqdweb?did=1445047021&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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Boinne, Raphael. "Stability Studies of an Offshore Wind Farms Cluster Connected with VSC-HVDC Transmission to the NORDEL Grid." Thesis, Norwegian University of Science and Technology, Department of Electrical Power Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-8961.

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<p>Offshore wind power has proven to be a renewable energy source with a high potential, especially in the North Sea, where an important development is going on. The location of the wind farms tends to move far from the coast to benefit stronger and more constant wind. In the same time, the power output of the wind farm is increasing to several hundreds of MW up to 1 GW. In the European liberalized electricity market, the interconnection of the countries become very important to facilitate the cross-border trade of electricity but also to improve the reliability of the grid. Combining this bot

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Renaudin, Fabien. "Integration and Stability of a Large Offshore Wind Farm with HVDC Transmission in the Norwegian Power System." Thesis, Norwegian University of Science and Technology, Department of Electrical Power Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9820.

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<p>In the last decades, due to the environmental concerns and the increase of energy demand, wind power has strongly penetrated the field of electricity generation. Today, because of the lack of onshore sites and visual and noise nuisances, the development of wind farms turns more and more to offshore and Norway has a great potential of offshore wind power. This thesis investigates the impact of the integration of an offshore 1000MW wind farm on the Norwegian power system. Two different transmissions are used, one HVAC transmission system and one HVDC transmission system. They are installed

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Karlsson, Casper. "Analysis of harmonic cross-modulation in HVDC line-commutated converters for practical design purposes." Thesis, Högskolan Väst, Avdelningen för Industriell ekonomi, Elektro- och Maskinteknik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-12308.

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The use of HVDC has many benefits over HVAC for some specific power transmission purposes. However, two major problems with HVDC links are that the converters produce harmonics and consume reactive power. Electrical filters are used to compensate for this and are a major cost driver of HVDC links. An accurate analysis of the modulation makes it possible to design an optimal filter solution in order to make the link financial viable. This report investigates how the complex cross-modulation phenomenon affects the harmonics. The investigation is limited to line-commutated converter technology (L

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