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Dissertations / Theses on the topic 'HVDC System'

Author: Grafiati

Published: 4 June 2025

Last updated: 14 July 2025

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1

Gao, Siyu. "Grid synchronisation of VSC-HVDC system." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/grid-synchronisation-of-vschvdc-system(6de14261-b0cd-4a82-bfb9-2ccaae012c4e).html.

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This thesis investigates issues affecting grid synchronisation of VSC-HVDC systems with particular regard to, but not limited to, offshore wind power generation during the complex but potentially serious behaviours following solar storms. An averaged value model (AVM) for the contemporary modular multilevel converter (MMC) based VSC-HVDC system is developed and is used in combination with different phase-locked loop (PLL) models and the unified magnetic equivalent circuit (UMEC) transformer model to assess the impacts of geomagnetically induced current (GIC) on grid synchronisation of an offsh

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2

Oyedokun, David Temitope. "Power flow and rotor angle stability studies of HVAC-HVDC power system interconnections using DigSILENT." Master's thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/12367.

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Includes bibliographical references (leaves 143-147).<br>The backbone of all industrialised nations is the success of the power sector, which involves an efficient, reliable and secure means of power generation, transmission and distribution. Industrial growth and urbanisation have together endlessly stimulated electrical engineers to ensure that the electrical power needs of the society are met.

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3

Xue, Ying. "Modelling and control of hybrid LCC HVDC System." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6496/.

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A novel hybrid HVDC system is proposed based on the traditional LCC HVDC system. The proposed system is able to achieve full elimination of commutation failures which cannot be achieved in traditional LCC HVDC systems. In addition, reactive power controller is designed for the hybrid HVDC system. The controller is able to achieve zero reactive power exchange with the connected AC system at inverter side. It can also facilitate a faster fault recovery. Finally, the black start capability of the hybrid system is investigated. The black start sequence and inverter AC voltage controller are design

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4

Gao, Yang. "Analysis and protection of multi-terminal HVDC system." Thesis, Queen's University Belfast, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.706682.

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The thesis is essentially concerned with the modeling and fault analysis of Modular Multilevel Converter (MMC) based High Voltage Direct Current (HVDC) systems with DC circuit breakers connected. A generalized MMC model is proposed and the system behaviour of MMCs subject to both DC line-to-line and line-to-ground faults is analyzed. Various stages of DC voltage / current transient processes are studied and analyzed. Simulation results are presented to illustrate the behaviour of the system under such faults. A hybrid multi-terminal HVDC transmission system model consisted of one MMC, one Full

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Jarnehammar, Filip. "Development of an Energy Management System for HVDC Grids." Thesis, KTH, Industriell ekologi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-189061.

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As demand for renewable energy sources increases so does the pressure exerted on the transmission grid. Variable sources strain the existing power lines and the control system needs to incorporate faster response times when redirecting power flow. Using HVDC grid technology multiple AC networks can be concatenated across longer distances. This creates op- portunity for solar- or wind power plants to be constructed further away from consumers. However this technology calls for a SCADA system being developed to bridge the gap between fast changing voltages throughout an HVDC grid and less freque

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Jarnehammar, Filip, and Niklas Ung. "Development of an Energy Management System for HVDC Grids." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-200636.

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Dalersand, Saga, Edvin Bäckstadi, and Fredrik Gjöthlén. "Measurement system for pre-discharge currents in HVDC tests." Thesis, Uppsala universitet, Institutionen för elektroteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-449959.

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To measure the current impulses before a discharge process in an insulation material is completed a proposed system has been built theoretically. The blocks in the system have been studied by going through relevant sources and meetings with the supervisor of the project and new ideas have been considered. With the goal of having a proposed theoretical circuit that can measure current impulses with a peak of 100A, some methods have been excluded and some have been put into the system. Exclusion of some methods are because there was not enough time to dig into a completely new approach for all

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8

Holthe, Alexander Håkan George. "Analysis of a Multi-Infeed HVDC System in the Norwegian Power System." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-26982.

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The impact of a new Modular Multi-Level Converter (MMC) on a Line Commutated Converter (LCC) in the same AC-grid, representing the future system of NordLink and NorNed is investigated. This multi-infeed HVDC system is compared against today's LCC stand alone system. A method for detecting commutation failure is proposed. The commutation failure immunity index is 36% and 28% respectively. The result indicate that the MMC-link hence mitigates the weakness of the LCC-link, and makes the LCC inverter less prone to commutation failure. The multi-infeed HVDC system is analysed in both steady an

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9

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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10

Borhani, Mohammad. "Anomaly Detection using Machine Learning Approaches in HVDC Power System." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-48714.

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11

Meier, Stephan. "System Aspects and Modulation Strategies of an HVDC-based Converter System for Wind Farms." Doctoral thesis, Stockholm : Skolan för elektro- och systemteknik, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10267.

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12

Shen, Li. "Model integration and control interaction analysis of AC/VSC HVDC system." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/model-integration-and-control-interaction-analysis-of-acvsc-hvdc-system(2d4bcb21-a97f-4c7f-b413-1a2a54086145).html.

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The development of voltage source converter (VSC) based high voltage direct current (HVDC) transmission has progressed rapidly worldwide over the past few years. The UK transmission system is going through a radical change in the energy landscape which requires a number of VSC HVDC installations to connect large Round 3 windfarms and for interconnections to other countries. For bulk power long distance transmission, VSC HVDC technology offers flexibility and controllability in power flow, which can benefit and strengthen the conventional AC system. However, the associated uncertainties and pot

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Leelaruji, Rujiroj. "Coordination of protection system and VSC-HVDC to mitigate cascading failures." Licentiate thesis, KTH, Electric Power Systems, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-13062.

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<p>The rapid development of the global economics has made power systems allover the world become large-scale interconnected grids. This increases the capabilityof power grids to transfer power over the long distance to serve the desiredpower demand with the minimum cost of operation. Unfortunately, it alsoenables the propagation of local failures into global networks. In other words,if a blackout happens in a power system, the size and the damage may significantlyincrease.</p><p>One of the main ways in which blackouts become widespread is cascadingfailures. This type of failure originates afte

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14

Yin, Haiping. "Modeling and Control of Wind Generation and Its HVDC Delivery System." Scholar Commons, 2011. http://scholarcommons.usf.edu/etd/3416.

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As the most developed renewable energy source, wind energy attracts the most research attentions. Wind energy is easily captured far away from the places where wind energy is used. Because of this unique characteristic of the wind, the generation and delivery systems of the wind energy need to be well controlled. The objective of this dissertation work is modeling and control of wind generation and its High Voltage Direct-Current (HVDC) delivery system. First of all, modeling of the Doubly-fed Induction Generator (DFIG)-based wind farm is presented including dynamic models of the wind turbine,

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15

Li, Can. "Robust coordinated damping control of power systems with multi-terminal VSC-HVDC system and FACTS." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7740/.

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This thesis investigates the robust and coordinated design of multiple damping controllers to ameliorate the damping characteristics of a bulky power system. A new methodology is proposed in this thesis for VSC-MTDC and FACTS damping controllers based on multiple control objectives and system multi-model. The key feature of the methodology is the robust and coordinated performance of the damping controllers. The formulated BMI-based optimization problem is solved systematically via a two- step approach. System multi-model is established in the design for the robustness of the controllers under

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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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Ruiz, Yuncosa Jose Luis. "Test Automation for HVDC System Protection A Proof of Concept for ABB." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-425400.

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When a software is designed, one of the most critical aspects of the process is the verification. In most cases, this operation can betime consuming, which is why it is always needed to speed up the process by the use of automated tools to perform the task. ABB Power Grids Division uses a large software for monitoring the HVDC system, which is one of the high voltage power transmission systems they offer. This control and protection software is called MACH3, and it is created in a graphical programming development environment called HiDraw, which is proprietary to the company. HiDraw allows to

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Khaleghi, Kerahroudi Shadi. "Development of novel operational stability control systems for embedded high voltage DC links." Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/12566.

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In order to achieve the ambitious decarbonisation targets of the UK government, up to 30GW of wind generation could be connected to the GB transmission system by 2020. The challenges imposed when incorporating this volume of renewable energy are significant, introducing new technical challenges for National Grid as the system operator for the Great Britain transmission system. The majority of this new renewable generation will be connecting in Scotland and offshore in the UK as a whole. This results in greater uncertainty in the system from significant changes to the direction and volume of po

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Veilleux, Etienne. "DC power flow controller and Marx DC-DC converter for multiterminal HVDC system." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116919.

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This thesis presents the concept of the dc power flow controller to address the power flow control issues inside a multiterminal High Voltage Direct Current (HVDC) system. The controller is connected in series on the HVDC transmission line and it is presented as a small appendage of a voltage source converter (VSC) station. The operation and the stability are shown via simulations of a 3-terminal and a 7-terminal HVDC grid. The controller increases the flexibility and the region of operation of the multiterminal HVDC system.The integration of an offshore wind farm into a multiterminal HVDC sys

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Mushagala, Jimmy Matabaro. "Harmonic analysis and effectiveness of mitigation techniques applied to a bipolar HVDC system." Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2461.

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Thesis (MTech (Electrical Engineering))--Cape Peninsula University of Technology, 2017.<br>High Voltage Direct Current (HVDC) transmission is a safe and efficient technology designed to deliver large amounts of electrical power over long distances with minimal losses and at low costs. HVDC links require converters and filters at both terminal stations. The core component of the HVDC system is the power converter that connects the DC and AC systems together. The conversion from AC to DC, and vice versa, is achieved mainly through electronic switches called thyristors. The thyristor-based Line C

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Ahmadi, Seyedhesam, and Mehrdad Bahmani. "Reglering av effektflöde i HVDC-system genom centraliserad och distribuerad spänningskontroll i realtid." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-254267.

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“High voltage direct current” (HVDC) teknologi har blivit allt viktigare teknik för att integrera förnybara energikällor i elnätet. För att styra ett sådant elsystem på bästa möjliga sätt krävs optimala kontrollstatergier både för omvandlarna och nätet. Så syftet med detta projekt är att undersöka hur olika regleringsmetoder, såsom centraliseradoch distribuerad spänningskontroll, kan påverka driften i ett 4-terminal HVDC-system. Ett optimalt effektflöde uppstår i systemet endast när likspänningen inte avviker från sitt börvärde och det uppnås genom att ha aktiv effekt regulator i varje nod i n

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Hwang, Sheng-Pu. "Harmonic State-Space Modelling of an HVdc Converter with Closed-Loop Control." Thesis, University of Canterbury. Electrical and Computer Engineering, 2014. http://hdl.handle.net/10092/8881.

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Frequency domain models for power electronic circuits are either based on iterative techniques such as Newton's method or linearised around an operating point. Iterative frequency domain models provide great accuracy as they are capable of calculating the exact switching instants of the device. On the other hand, the accuracy of a linearised frequency domain model relies on the magnitude of input waveform to be small so that the circuit's operating point does not vary or varies very little. However, an important advantage of a linearised model is its ability to provide insight into waveform di

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23

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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Preece, Robin. "A probabilistic approach to improving the stability of meshed power networks with embedded HVDC lines." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/a-probabilistic-approach-to-improving-the-stability-of-meshed-power-networks-with-embedded-hvdc-lines(b7e4843f-52b4-4ccf-88ad-48f9195b7270).html.

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This thesis investigates the effects of High Voltage Direct Current (HVDC) lines andmulti-terminal grids on power system small-disturbance stability in the presence ofoperational uncertainties. The main outcome of this research is the comprehensiveprobabilistic assessment of the stability improvements that can be achieved through theuse of supplementary damping control applied to HVDC systems.Power systems are increasingly operated closer to stability boundaries in order toimprove their efficiency and economic value whilst a growing number of conventionalcontrolled power plants are being repla

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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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Brask, Martin. "MODELLING OF THE POWER SYSTEM OF GOTLAND INPSS/E WITH FOCUS ON HVDC LIGHT." Thesis, KTH, Elektriska energisystem, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-118949.

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The purpose with this project is to develop a model of the whole power system of Gotland in the power system simulation software PSS/E. A model of the whole power system of Gotland has earlier been used in the power system simulation software Simpow but now there is a need to develop a model in PSS/E. In the power system of Gotland there are several components that need to be modelled such as lines, loads, transformers, shunt impedances, synchronous machines, asynchronous machines, an HVDC Classic link and an HVDC Light link. These components are modelled in the Simpow model and needs to be co

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Wang, Puyu. "A multi-terminal modular multilevel converter-based HVDC system with an offshore wind farm." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6442/.

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The increased demand for electrical power and the concern of environmental pollution drive the development of bulk-power transmission over long distance and renewable energy. The use of multi-terminal (MT) modular multilevel converter (MMC) high-voltage direct current (HVDC) technology to integrate power from the offshore wind farm (OWF) is becoming increasingly popular. However, some technological barriers and potential risks may exist in the new technology, which requires comprehensive research and innovative developments. This thesis investigates several important aspects of an offshore int

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Kong, Dechao. "Advanced HVDC systems for renewable energy integration and power transmission : modelling and control for power system transient stability." Thesis, University of Birmingham, 2013. http://etheses.bham.ac.uk//id/eprint/4217/.

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The first part is concerned with dynamic aggregated modelling of large offshore wind farms and their integration into power systems via VSC-HVDC links. The dynamic aggregated modelling of offshore wind farms including WT-DFIGs and WT-PMSGs are proposed to achieve effective representations of wind farms in terms of computational time and simulation accuracy for transient stability analysis. Modelling and control of VSC-HVDC systems for integration of offshore wind farms are investigated. Comparisons of two control schemes of rectifier-side converter are carried out to evaluate their dynamic per

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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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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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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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Makhraz, Bernard. "Redéfinition des standards de qualité réseaux HVDC en aéronautique." Thesis, Toulouse, INPT, 2020. http://www.theses.fr/2020INPT0008.

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Le développement des systèmes électriques et l’élaboration d’architectures de plus en plus complexes pose des problématiques également complexe relatives à la qualité réseau, ainsi que de la stabilité. De ce fait, l’avionneur impose, à la fois aux équipementiers concepteurs des charges et des sources, des spécifications pour s’assurer du bon fonctionnement de l’ensemble du réseau et des appareils qui lui sont connectés. Cependant, les équipementiers appliquent des techniques de filtrages pour répondre, d’une part aux standards imposés. D’autre part, ces étages de filtrages protègent les équipe

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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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Cao, Jun. "Optimal and small-signal stability improvement of power system operation using multi-terminal VSC-HVDC." Thesis, Queen's University Belfast, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.602454.

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The thesis is essentially concerned with some theoretical aspects of the economic and stability studies of power systems with great penetration levels of renewable energy. In part I, firstly, the process of incorporation of VSC MTDC model in ACIDC state estimation is described in detail. The proposed approach simultaneously upgrades the estimated values of the state variables, for a unified solution in a single reference frame. The effectiveness of the proposed ACIMTDC state estimation algorithm and the bad data identification process is demonstrated and validated in modified IEEE test system.

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Pålsson, Rolf. "Studie av subsynkron interaktion (SSTI) mellan ett HVDC system med spänningsstyva strömriktare och en närliggande generator." Thesis, Högskolan Dalarna, Elektroteknik, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:du-2075.

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Syftet med examensarbetet är att studera den subsynkrona interaktionen (subsynchronous torsional interaktion, SSTI) mellan ett HVDC system med spänningsstyva strömriktare och en närliggande generator. Studien utförs med hjälp av datorsimuleringar och fokuserar på att studera dämpkaraktäristiken för SSTI. Studien ska visa hur faktorer såsom den överförda effektens storlek och riktning, vald driftmod och kraftsystemets kortslutningseffekt påverkar dämpkaraktäristiken. Rapporten beskriver subsynkron oscillation (SSO) och tillvägagångssättet vid en SSTI undersökning. En kort introduktion till HVDC

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Charrada, Madiha. "Etude de qualité et de stabilité des réseaux aéronautiques embarqués HVDC." Phd thesis, Toulouse, INPT, 2013. http://oatao.univ-toulouse.fr/10887/1/Charrada.pdf.

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Dans le contexte du concept de l’avion «plus électrique », l’électricité prend une part croissante dans les systèmes embarqués aéronautiques. Ainsi, de nombreuses évolutions ont eu lieu, concernant les réseaux de bord, notamment l’architecture du réseau qui est devenue de plus en plus complexe, intégrant de nombreux équipements de différentes natures ; ceci entraîne de multiples questions relatives à la qualité et la stabilité du réseau. C’est dans ce contexte que s’inscrivent ces travaux de thèse, qui aboutissent d’une part à la mise en œuvre de méthodes d’analyse de la stabilité et de la qua

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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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Abildgaard, Elisabeth Nøkleby. "Exploring the Properties of a Modular Multilevel Converter Based HVDC Link : With Focus on Voltage Capability, Power System Relations, and Control System." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19032.

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The properties of a Modular Multilevel Converter (MMC) are investigated. This is a new and promising converter type for High Voltage Direct Current (HVDC) applications. A case with a MMC connected to a stiff grid through a filter and a transformer is analysed both theoretically and in simulations, with focus on three main topics.The first topic is the available voltage at the converter terminal and modulation strategies. Theoretical evaluations are compared with simulation results. Two different methods are used to analytically investigate the relationship between modulation index and terminal

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Oliveira, JosÃ Dickson AraÃjo de. "Evaluation of the operation of the HVDC system of Madeira River complex interconnection to the Southern Region of the brazilian electric system." Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15766.

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This work proposes a model for the HVDC transmission system of the Madeira River Complex, which is developed using PSCAD/EMTDC and based on the design provided by the Energy Research Company (EPE) during the granting concession stage. The implemented model is evaluated by comparing the simulation results and actual data regarding events that occurred in the National Interconnected System (SIN) involving the complex. The Madeira River HVDC system is rated at 7,100 MW, being responsible for transmitting the power generated by the hydropower plants of Santo AntÃnio and Jirau, which are close to t

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Romero, Rodríguez Miguel. "Synthèse de contrôle par supervision pour des systèmes HVDC à base de convertisseurs modulaires multiniveaux." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI081.

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Ces dernières années, les technologies à courant continu haute tension (en anglais, HVDC) basées sur les convertisseurs modulaires multiniveaux (MMC) sont adoptées comme solution pour l'intégration efficace des énergies renouvelables dans les réseaux électriques. Cependant, ces technologies présentent de nouveaux défis dans la façon dont les systèmes de transmission de puissance sont contrôlés et exploités, car des stratégies de contrôle plus rapides et plus complexes seront nécessaires dans un domaine qui repose aujourd'hui fortement sur la décision humaine. Dans ce contexte, la modélisation

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Chen, Shiun. "Analysis of HVDC convertor transformer core saturation instability, and design of a data acquisition system for its assessment." Thesis, University of Canterbury. Electrical and Electronic Engineering, 1996. http://hdl.handle.net/10092/5593.

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This thesis is divided into two parts; The analysis of HVDC convertor transformer core saturation instability, and the design of a flexible data acquisition system for its assessment. A linearised direct frequency domain analysis of the mechanism behind the core saturation instability is presented. Using linearised convertor transfer functions and transformer saturation characteristics on ac and dc equivalents, the system equations are solved to describe the phenomenon. A term, referred to as Saturation Stability Factor, is derived to measure the system susceptibility to such an instability.

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Ensini, Luca. "Measurement and simulation of conducted disturbances on DC power grids of a HVDC system with an active DC/DC converter." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15332/.

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With the increasing of the distributed generation, DC microgrids have become more and more common in the electrical network. To connect devices in a microgrid, converter are necessary, but they are also source of disturbances due to their functioning. In this thesis, measurement and simulation of conducted emissions, within the frequency range 2-150kHz, of a DC/DC buck converter are studied.

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Ubisse, Albino Virgílio. "Comparison of DigSILENT, Matlab PST and PSAT for steady state and stability studies on HVAC-HVDC systems." Master's thesis, University of Cape Town, 2012. http://hdl.handle.net/11427/12273.

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Includes abstract.<br>Includes bibliographical references.<br>It is said that the electric power system is the most complex system ever built by mankind. Over the past few decades, many software packages focusing on the study of this complex system have been developed. These software packages range from academic/ research based to industrial/commercial based software. Before any component/device is installed in the power system, it undergoes rigorous research, simulation and testing.

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Obradovic, Danilo. "Coordinated Frequency Control Between Interconnected AC/DC Systems." Licentiate thesis, KTH, Elkraftteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-280156.

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With ambitions of reducing the environmental pollution, power systems integrate larger shares of Renewable Energy Sources (RES) to phase out conventional thermal and nuclear generators. Since RES (such as wind and solar power) are connected to the grid through power electronics devices, they do not inherently contribute to system inertia. With decreasing inertia, the Instantaneous Frequency Deviation (IFD), which follows a power unbalance, is significantly impacted. Frequency Containment Reserves (FCR) are designed to provide a fast dynamic response, counteract power imbalances and stabilize t

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Egea, Àlvarez Agustí. "Multiterminal HVDC transmissions systems for offshore wind." Doctoral thesis, Universitat Politècnica de Catalunya, 2014. http://hdl.handle.net/10803/279365.

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Offshore wind is emerging as one of the future energy vectors. Offshore wind power plants locations provide more strong and constant wind speed that allows to extract more power compared to onshore locations. In addition, as wind turbine components transportation is less restricted to terrestrial infrastructure, bigger and more powerful wind turbines can be installed offshore. In Europe, 1,567 MW of offshore wind power was installed in 2013. It represents the 14\% of the total wind power installed in Europe. Offshore wind power plants near the shore can be connected to the main grid by means

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Haileselassie, Temesgen Mulugeta. "Control of Multi-terminal VSC-HVDC Systems." Thesis, Norwegian University of Science and Technology, Department of Electrical Power Engineering, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-8933.

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<p>The North Sea has a vast amount of wind energy with largest energy per area densities located about 100-300Km of distance from shore. Should this energy be tapped by offshore wind farms, HVDC transmission would be the more feasible solution at such long subsea distances. On the other hand Norwegian oil/gas platforms in the North Sea use electricity from gas fired turbines at offshore sites. These gas turbines have much less efficiency than onshore generation of electricity and also release large amounts of green house gases. Therefore supplying the platforms with power from onshore transmit

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Lee, Hau Aik Denis. "Voltage and power stability of HVDC systems /." Stockholm, 1998. http://www.lib.kth.se/abs98/lee0311.pdf.

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Alvsvåg, Øyvind. "HVAC-systems : Modeling, simulation and control of HVAC-systems." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for teknisk kybernetikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13821.

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It is of interest for companies to keep the annual operating cost of their buildings as low as possible. A substantial share of the annual operating costs are due to the large amount of energy needed for heating of the ventilated air and heating of the rooms inside the buildings. Also much of the electrical energy in the world today is created using fossil fuel or charcoal. This has an environmental aspect and the consumers of energy becomes more and more aware of this. Thus reducing the energy used by a buildings HVAC system can save the users for considerable expenditures and also has an env

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Chang, Bin. "DC protection of multi-terminal VSC-HVDC systems." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/dc-protection-of-multiterminal-vschvdc-systems(7ac492ce-d745-4ea0-9452-1228d418b296).html.

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Voltage-Sourced Converter High Voltage Direct Current (VSC-HVDC) transmission technology has received great interest and experienced rapid development worldwide because of its compact size, ability to connect two asynchronous AC systems and ability to connect to weak AC grids. It is expected that VSC-HVDC will play a significant role in future power transmission networks. Multi-Terminal Direct Current (MTDC) networks are even being established based on VSC-HVDC and these have great potential to support conventional AC transmission networks. However, such DC networks are vulnerable to any DC si

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