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Dissertations / Theses on the topic 'HYBRID AC DC MICROGRID'

Author: Grafiati

Published: 11 September 2023

Last updated: 25 July 2025

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1

Qiao, Feng. "Hybrid AC/DC distribution network voltage control." Thesis, University of Sydney, 2020. https://hdl.handle.net/2123/22978.

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A hybrid AC/DC distribution network can be formed after integration of increasing numbers of electronically interfaced distributed generators (DGs) and microgrids (MGs). Voltage/Var control (VVC) in this evolved system requires to control not only the traditional VVC resources such as transformer tap changer and shunt capacitor but also the newly emerged ones such as DGs and MGs. In addition, various stakeholders such as MG's operator and distribution network operator coexist in this evolved system. They usually represent distinct operational interests and make the VVC even more difficult. The

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2

Farhadi, Mustafa. "Hybrid Energy Storage Implementation in DC and AC Power System for Efficiency, Power Quality and Reliability Improvements." FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/2471.

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Battery storage devices have been widely utilized for different applications. However, for high power applications, battery storage systems come with several challenges, such as the thermal issue, low power density, low life span and high cost. Compared with batteries, supercapacitors have a lower energy density but their power density is very high, and they offer higher cyclic life and efficiency even during fast charge and discharge processes. In this dissertation, new techniques for the control and energy management of the hybrid battery-supercapacitor storage system are developed to improv

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3

Salehi, Pour Mehr Vahid. "Development and Verification of Control and Protection Strategies in Hybrid AC/DC Power Systems for Smart Grid Applications." FIU Digital Commons, 2012. http://digitalcommons.fiu.edu/etd/804.

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Modern power networks incorporate communications and information technology infrastructure into the electrical power system to create a smart grid in terms of control and operation. The smart grid enables real-time communication and control between consumers and utility companies allowing suppliers to optimize energy usage based on price preference and system technical issues. The smart grid design aims to provide overall power system monitoring, create protection and control strategies to maintain system performance, stability and security. This dissertation contributed to the development of

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4

Lo, Franco Francesco. "Integrazione di sistemi di accumulo a batterie e impianti fotovoltaici di grande taglia per applicazioni grid-connected." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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In un impianto fotovoltaico connesso alla rete elettrica, l’ integrazione di un sistema di accumulo permette di raccogliere l’ energia dal solare nelle ore di minor richiesta di rete (di giorno), ed erogarla nei momenti di bassa produzione e di maggiore richiesta di rete (la sera). In collaborazione con ENGIE Eps, è sorta l’ esigenza di confrontare tre diverse tipologie di accoppiamento delle batterie in un impianto ibrido PV+Batteria connesso alla rete elettrica. La prima architettura è chiamata AC coupling poiché il BESS (Battery Energy Storage System) è connesso tramite opportuni converti

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5

Santos, Heron Alves dos. "Design of a controlled single-phase ac-dc converter for interconnection of DC and AC buses of a microgrid." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=12977.

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The recent growth expectation of the participation of solar-photovoltaic energy sources in the power generation matrix has significantly increased the number of grid-connected systems. For connection to power grid, it is essential to use a dc-ac converter, which is able to suit the characteristics of the power provided by the photovoltaic modules to grid parameters. This dissertation presents a project proposal of a 2 kW single phase dc-ac converter for connecting a 311 V dc bus to a 220 Vrms ac bus of a microgrid. The proposed converter is bidirectional and allows, when necessary, the power f

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6

Anderson, Glenn Warwick Jan. "Hybrid simulation of AC-DC power systems." Thesis, University of Canterbury. Electrical and Computer Engineering, 1995. http://hdl.handle.net/10092/1176.

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Transient stability studies are primarily concerned with the generator response of ac power systems and use only steady state type equations to model HVdc converter terminals. These equations are adequate for small disturbances at the converter terminals but cannot accurately represent a converters behaviour during, and through its recovery of, a significant transient disturbance. A detailed three phase electromagnetic analysis is necessary to describe the converters correct behaviour. This thesis describes an accurate and effective hybrid method combining these two types of studies, fo

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7

Podes, Christopher. "AC/DC: Let There Be Hybrid Cooling." Scholar Commons, 2010. http://scholarcommons.usf.edu/etd/3434.

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In today’s increasingly energy conscious society, the methods of providing thermal comfort to humans are constantly under scrutiny. Depending on the climate, and the comfort requirements of the occupants, buildings can be designed to heat and cool occupants with passive methods, as well as mechanical methods. In the subtropics, where buildings often need to be heated in the winter and cooled in the summer, a synthesis of these two methods would be ideal. However, there is a disconnect between the integration of passive cooling and mechanical air conditioning, in subtropical architecture. A stu

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8

Alsharif, Sameer. "MANAGEMENT OF HYBRID (AC-DC) MICRO-GRIDS." Case Western Reserve University School of Graduate Studies / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=case1355191663.

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9

Mino, Kazuaki. "Novel hybrid unidirectional three-phase AC-DC converter systems /." [S.l.] : [s.n.], 2009. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=18185.

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10

Agbemuko, Adedotun Jeremiah. "Modelling and control strategies for hybrid AC/DC grids." Doctoral thesis, Universitat Politècnica de Catalunya, 2019. http://hdl.handle.net/10803/667950.

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The proposals for large-scale deployment of renewable energy sources is leading to the need for more cross-border interconnections creating a pan-European power system, at the EU level. Such interconnections may take advantage of existing AC systems, but also of the DC links or DC grids under development; hence, hybrid AC/DC grids. Although hybrid AC/DC transmission grids are far from being truly large-scale, they are beginning to evolve as key components of future transmission infrastructures. By hybrid AC/DC grids, power electronic interfaces are invariably implied. As a consequence, several

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11

Sarker, Partha Sarathi. "DYNAMIC MODELING, STABILITY ANALYSIS AND CONTROL OF AC/DC INTERCONNECTED MICROGRID USING DQ-TRANSFORMATION." Master's thesis, Temple University Libraries, 2018. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/518146.

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Electrical and Computer Engineering<br>M.S.E.E.<br>In recent years, there have been significant changes in power systems due to the integration of renewables, distributed generation, switched power loads, and energy storage systems, etc. Locally these AC/DC microgrids include both DC generation (such as solar PV) and AC generation (such as wind generation), various DC and AC loads, converters and inverters, and energy storage systems, such as storage batteries and supercapacitors. DC systems are often characterized as low inertia systems whereas AC generation and systems are usually high inert

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12

Briggner, Viktor, Pontus Grahn, and Linus Johansson. "Centralized Versus Distributed State Estimation for Hybrid AC/DC Grid." Thesis, KTH, Industriell ekologi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-189112.

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State estimation enables for values throughout a power transmission grid to be known with a higher level of certainty. New technologies for bulk power transmission and power grid measuring enables for new possibilities in the energy sector and it is required that state estimation algorithms are developed to adapt to these new technologies. This project aims to develop a state estimator (SE) that is modified for hybrid AC/HVDC grids with voltage source converters (VSC) and phasor measurement units (PMU). Two different sets of architectures are tested. The centralized architecture where one comm

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Briggner, Viktor, Pontus Granhn, and Linus Johansson. "Centralized Versus Distributed State Estimation for Hybrid AC/DC Grid." Thesis, KTH, Skolan för elektro- och systemteknik (EES), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-200635.

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14

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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15

White, Terence H. "A three-phase hybrid dc-ac inverter system utilizing hysteresis control." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Jun%5FWhite%5FTerence.pdf.

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Fox, Ian Micah. "Design and Applications of Hybrid Switches in DC-AC Power Converter Topologies." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1543157006458193.

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17

Ali, Sadaqat. "Energy management of multi-source DC microgrid systems for residential applications." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0159.

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Comparé au réseau électrique alternatif (AC), le réseau électrique en courant continu (DC) a démontré de nombreux avantages tels que son interface naturelle avec les RES, les systèmes de stockage d'énergie et les charges en courant continu, une efficacité supérieure avec moins d'étapes de conversion, et un contrôle plus simple sans effet de peau et sans considérations sur le flux de puissance réactive. Le micro-réseaux DC reste une technologie relativement nouvelle, et ses architectures de réseau, stratégies de contrôle, techniques de stabilisation méritent d'énormes efforts de recherche. Dans

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Farias, de Barros Heitor. "Planification de réseaux de distribution mixtes AC/DC." Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALT050.

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L'intégration croissante des ressources énergétiques natives en courant continu à l'échelle de réseaux électriques, telles que les systèmes photovoltaïques, les véhicules électriques, les systèmes de stockage et les centres de données, remet en question le choix conventionnel des systèmes de distribution en courant alternatif (AC) au niveau de la moyenne tension (MV). Cette recherche vise à évaluer la viabilité technique et économique des réseaux de distribution MV AC/DC en développant des outils de planification pour les réseaux hybrides.L'étude propose des modèles de planification optimale d

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19

Chen, Fang. "Control of DC Power Distribution Systems and Low-Voltage Grid-Interface Converter Design." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/77532.

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DC power distribution has gained popularity in sustainable buildings, renewable energy utilization, transportation electrification and high-efficiency data centers. This dissertation focuses on two aspects of facilitating the application of dc systems: (a) system-level control to improve load sharing, voltage regulation and efficiency; (b) design of a high-efficiency interface converter to connect dc microgrids with the existing low-voltage ac distributions, with a special focus on common-mode (CM) voltage attenuation. Droop control has been used in dc microgrids to share loads among multip

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LaBella, Thomas Matthew. "A High-Efficiency Hybrid Resonant Microconverter for Photovoltaic Generation Systems." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/50526.

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The demand for increased renewable energy production has led to increased photovoltaic (PV) installations worldwide. As this demand continues to grow, it is important that the costs of PV installations decrease while the power output capability increases. One of the components in PV installations that has lots of room for improvement is the power conditioning system. The power conditioning system is responsible for converting the power output of PV modules into power useable by the utility grid while insuring the PV array is outputting the maximum available power. Modular power conditioning sy

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21

Elsayed, Ahmed T. "Optimum Distribution System Architectures for Efficient Operation of Hybrid AC/DC Power Systems Involving Energy Storage and Pulsed Loads." FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/3005.

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After more than a century of the ultimate dominance of AC in distribution systems, DC distribution is being re-considered. However, the advantages of AC systems cannot be omitted. This is mainly due to the cheap and efficient means of generation provided by the synchronous AC machines and voltage stepping up/down allowed by the AC transformers. As an intermediate solution, hybrid AC/DC distribution systems or microgrids are proposed. This hybridization of distribution systems, incorporation of heterogeneous mix of energy sources, and introducing Pulsed Power Loads (PPL) together add more compl

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22

Hadjikypris, Melios. "Supervisory control scheme for FACTS and HVDC based damping of inter-area power oscillations in hybrid AC-DC power systems." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/supervisory-control-scheme-for-facts-and-hvdc-based-damping-of-interarea-power-oscillations-in-hybrid-acdc-power-systems(cc03b44a-97f9-44ec-839f-5dcbcf2801f1).html.

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Modern interconnected power systems are becoming highly complex and sophisticated, while increasing energy penetrations through congested inter-tie lines causing the operating point approaching stability margins. This as a result, exposes the overall system to potential low frequency power oscillation phenomena following disturbances. This in turn can lead to cascading events and blackouts. Recent approaches to counteract this phenomenon are based on utilization of wide area monitoring systems (WAMS) and power electronics based devices, such as flexible AC transmission systems (FACTS) and HVDC

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23

Musa, Aysar [Verfasser], Antonello [Akademischer Betreuer] Monti, and Albert [Akademischer Betreuer] Moser. "Advanced control strategies for stability enhancement of future hybrid AC/DC networks / Aysar A. Aydan Musa ; Antonello Monti, Albert Moser." Aachen : Universitätsbibliothek der RWTH Aachen, 2019. http://d-nb.info/1210929228/34.

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24

Tulpule, Pinak J. "Control and optimization of energy flow in hybrid large scale systems - A microgrid for photovoltaic based PEV charging station." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1313522717.

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25

Groen, Benjamin Carson. "Investigation of DC Motors for Electric and Hybrid Electric Motor Vehicle Applications Using an Infinitely Variable Transmission." BYU ScholarsArchive, 2011. https://scholarsarchive.byu.edu/etd/2696.

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Since the early 1900's demand for fuel efficient vehicles has motivated the development of electric and hybrid electric vehicles. Unfortunately, some components used in these vehicles are expensive and complex. AC motors, complex electronic controllers and complex battery management systems are currently used in electric (EV) and hybrid vehicles. This research examines various motors and speed control methods in an attempt to help designers identify which motors would be best suited for an EV powertrain application. The feasibility of using DC motors coupled with an Infinitely Variable Transmi

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Hotz, Matthias [Verfasser], Wolfgang [Akademischer Betreuer] Utschick, Mario [Gutachter] Paolone, and Wolfgang [Gutachter] Utschick. "Optimal Power Flow in Hybrid AC/DC Power Systems : Modeling, Methods, and Design Implications / Matthias Hotz ; Gutachter: Mario Paolone, Wolfgang Utschick ; Betreuer: Wolfgang Utschick." München : Universitätsbibliothek der TU München, 2021. http://d-nb.info/123143452X/34.

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Qian, Hao. "A High-Efficiency Grid-Tie Battery Energy Storage System." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/29008.

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Lithium-ion based battery energy storage system has become one of the most popular forms of energy storage system for its high charge and discharge efficiency and high energy density. This dissertation proposes a high-efficiency grid-tie lithium-ion battery based energy storage system, which consists of a LiFePO4 battery based energy storage and associated battery management system (BMS), a high-efficiency bidirectional ac-dc converter and the central control unit which controls the operation mode and grid interface of the energy storage system. The BMS estimates the state of charge (SOC) and

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Moosavi, Anchehpoli Seyed Saeid. "Analysis and diagnosis of faults in the PMSM drivetrains for series hybrid electrical vehicles (SHEVs)." Thesis, Belfort-Montbéliard, 2013. http://www.theses.fr/2013BELF0224/document.

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L'intérêt pour les véhicules électriques ne cesse de croitre au sein de la société contemporaine compte tenu de ses nombreuses interrogations sur l’environnement et la dépendance énergétique. Dans ce travail de thèse, nous essayons d’améliorer l’acceptabtabilité sociétale du véhicule électrique en essayant de faire avancer la recherche sur le diagnostique des défauts d’une chaine de traction électrique. Les résultats escomptés devraient permettre à terme d’améliorer la fiabilité et la durabilité de ces systèmes.Nous commençons par une revue des problèmes des défauts déjà apparus dans les véhic

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Karania, Nabil. "Contrôle du Compensateur Actif Parallèle à Génération Photovoltaïque pour les Réseaux Intelligents." Electronic Thesis or Diss., CY Cergy Paris Université, 2024. http://www.theses.fr/2024CYUN1288.

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Dans les réseaux de distribution électrique et les réseaux intelligents, l'adoption généralisée des composants électroniques de puissance pose divers défis en matière de qualité de l'énergie. L'intégration des sources d'énergie renouvelable aggrave ces défis en raison des fluctuations de tension, des écarts de fréquence et de la distorsion des formes d'onde inhérents à ces sources, dont les performances dépendent des conditions météorologiques. Cette thèse aborde ces défis à travers trois solutions visant à améliorer la qualité de l'énergie électrique dans les réseaux de distribution, en se fo

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Al-Bayaty, Hussein Kamal Anwer. "Novel methods of utilization, elimination, and description of the distortion power in electrical circuits." Thesis, University of Plymouth, 2018. http://hdl.handle.net/10026.1/10646.

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Firstly, this thesis investigates the electrical power harmonics in an attempt to utilize harmonic current and its distortion power in a novel idea to reconvert the distortion power into useful power. This is done, in order to feed different DC or AC loads in single and three-phase power system by using passive or active filters and accordingly, develop a new topology of hybrid active power filter (HAPF). In addition, this circuit can be considered as a power factor corrector (PFC) because it reduces the total harmonic distortion (THD) and improves the power factor (PF). Secondly, this thesis

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31

Vidales, Luna Benjamin. "Architecture de convertisseur intégrant une détection de défauts d'arcs électriques appliquée au sources d'énergie continues d'origine photovoltaïques." Electronic Thesis or Diss., Université de Lorraine, 2021. http://www.theses.fr/2021LORR0040.

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Détection de défaut d'arcs intégrée dans un convertisseur intelligent contrôlé par FPGA pour les panneaux photovoltaïques. La mise au point de convertisseur intelligents intégrant des dispositifs de protection est une thématique que cherche à développer l'Institut Technologique de Morelia (Mexique) avec laquelle nous collaborons sur ce projet. L'objectif plus spécifique de ce travail repose sur la détection de défauts d'arc électrique en se basant sur le contrôle intelligent des onduleurs utilisés dans la gestion de l'énergie produite par des panneaux photovoltaïques. Depuis plusieurs années,

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Priyadarshanee, Lipsa. "Modeling and control of hybrid ac/dc microgrid." Thesis, 2012. http://ethesis.nitrkl.ac.in/3938/1/thesis_lipsa.pdf.

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Renewable energy based distributed generators (DGs) play a dominant role in electricity production, with the increase in the global warming. Distributed generation based on wind, solar energy, biomass, mini-hydro along with use of fuel cells and microturbines will give significant momentum in near future. Advantages like environmental friendliness, expandability and flexibility have made distributed generation, powered by various renewable and nonconventional microsources, an attractive option for configuring modern electrical grids. A microgrid consists of cluster of loads and distributed gen

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Tovar, Luís Gonçalo Cipreste Leal de Médicis. "Hybrid AC/DC Microgrids for Rural Electrification." Master's thesis, 2020. https://hdl.handle.net/10216/132845.

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O objetivo principal desta dissertação é construir um modelo de uma rede híbrida AC/DC no Software Simulink e estudar a maneira como funciona em diferentes condições e cenários. Esta tese divide-se em seis capítulos: o primeiro, a Introdução, explica os principais objetivos, as contribuições, a motivação e como a tese está organizada; o segundo capítulo, o Estado da Arte, reporta-se aos conceitos básicos da eletricidade em áreas rurais, como é que as micro redes e micro redes híbridas funcionam, as suas arquiteturas, modelos utilizados, aplicações, implementação elétrica e a sua importância n

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Tovar, Luís Gonçalo Cipreste Leal de Médicis. "Hybrid AC/DC Microgrids for Rural Electrification." Dissertação, 2020. https://hdl.handle.net/10216/132845.

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O objetivo principal desta dissertação é construir um modelo de uma rede híbrida AC/DC no Software Simulink e estudar a maneira como funciona em diferentes condições e cenários. Esta tese divide-se em seis capítulos: o primeiro, a Introdução, explica os principais objetivos, as contribuições, a motivação e como a tese está organizada; o segundo capítulo, o Estado da Arte, reporta-se aos conceitos básicos da eletricidade em áreas rurais, como é que as micro redes e micro redes híbridas funcionam, as suas arquiteturas, modelos utilizados, aplicações, implementação elétrica e a sua importância n

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JENA, RAVI KANTA. "POWER MANAGEMENT AND CO-ORDINATION CONTROL OF HYBRID AC DC MICROGRID IN GRID CONNECTED AND ISLANDED CONDITIONS." Thesis, 2019. http://dspace.dtu.ac.in:8080/jspui/handle/repository/17064.

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In remote rural areas, which are far from the primary grid network, mostly renewable power generators are introduced and there is the chance of a fragile transmission line connection. The rapidly growing demand and grid integration of renewable energies has laid the foundation for ac / dc microgrid. DGs ' interconnection with the utility / grid through interlinking converters has raised concerns about secure operation and equipment surveillance. The microgrid can be meant for the client to satisfy their needs and requirements; for example, improving local reliability, minimizing feeder losses,

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Abuhilaleh, Mohammad Mahmoud Jamil. "Power Management and Control Strategies in Hybrid AC/DC Microgrids." Thesis, 2020. http://hdl.handle.net/10453/143867.

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University of Technology Sydney. Faculty of Engineering and Information Technology.<br>The future trend of the power system is to ensure reliable, flexible, affordable and efficient power supply for customers with lower emissions. Conventional AC or DC microgrid suffers from increased losses and lower efficiency due to several AC-DC and DC-AC conversions. Therefore, hybrid microgrid (HMG) is getting popular to meet the growing penetration of modern DC loads and renewable energy sources with DC outputs into the existing AC power systems. The main objective of this dissertation is to develop and

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DUONG, BUI MINH, and 斐明陌. "Simulation and Field Test of AC Microgrid and DC Microgrid Fault Protection Systems." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/31669675526650996614.

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博士<br>中原大學<br>電機工程研究所<br>104<br>Microgrid (MG) is an emerging configuration of power distribution systems, which mainly consists of distributed energy resources (DERs) such as renewable energy sources and distributed generators (DGs), energy storage systems (ESS), loads, energy management system (EMS), and protective devices. Main advantages of the microgrid are: (i) facilitating high penetration of renewable energy sources; (ii) improving reliability of the power system, and (iii) having high efficiency and low environment impacts. The microgrid, however, meets with certain challenges in (i)

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"Modeling and Large Signal Stability Analysis of A DC/AC Microgrid." Master's thesis, 2018. http://hdl.handle.net/2286/R.I.50493.

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abstract: The concept of the microgrid is widely studied and explored in both academic and industrial societies. The microgrid is a power system with distributed generations and loads, which is intentionally planned and can be disconnected from the main utility grid. Nowadays, various distributed power generations (wind resource, photovoltaic resource, etc.) are emerging to be significant power sources of the microgrid. This thesis focuses on the system structure of Photovoltaics (PV)-dominated microgrid, precisely modeling and stability analysis of the specific system. The grid-connected mod

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Salgado, César Eduardo Marques. "Desenvolvimento dos conversores de potência para o sistema de alimentação de uma microrrede isolada baseada em energias renováveis." Master's thesis, 2018. http://hdl.handle.net/1822/60000.

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Dissertação de mestrado em Engenharia Eletrónica e de Computadores<br>A energia elétrica tem um papel extremamente importante no desenvolvimento de uma região, bem como na melhoria da qualidade de vida do ser humano. É assim fundamental eletrificar regiões isoladas e com elevadas taxas de subdesenvolvimento. A eletrificação da grande maioria destas regiões isoladas, passa pela produção local de energia recorrendo a fontes de energia renovável, quer por razões logísticas quer ambientais. Nesta dissertação são apresentados e descritos, os sistemas de eletrónica de potência que permitem implemen

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Wang, Hui. "Shielding effect of AC conductors in AC/DC hybrid power transmission." 1990. http://hdl.handle.net/1993/17271.

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Fernandes, Fábio André. "Desenvolvimento dos conversores de potência para o sistema de alimentação de um centro social sustentável isolado." Master's thesis, 2015. http://hdl.handle.net/1822/54584.

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Dissertação de mestrado integrado em Engenharia Eletrónica e de Computadores<br>A crescente motivação para a utilização de fontes de energias renováveis prende-se essencialmente com a redução das emissões de CO2 e com a melhoria da qualidade de vida da humanidade. Isto é especialmente verdade em comunidades pequenas, isoladas e autónomas, onde o acesso a fontes de energia renováveis é a única solução para satisfazer as suas necessidades energéticas. Nesta dissertação são estudados os sistemas de eletrónica de potência e os restantes constituintes de uma microrrede que permitem o funciona

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"Hybrid AC-High Voltage DC Grid Stability and Controls." Doctoral diss., 2017. http://hdl.handle.net/2286/R.I.46197.

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abstract: The growth of energy demands in recent years has been increasing faster than the expansion of transmission facility construction. This tendency cooperating with the continuous investing on the renewable energy resources drives the research, development, and construction of HVDC projects to create a more reliable, affordable, and environmentally friendly power grid. Constructing the hybrid AC-HVDC grid is a significant move in the development of the HVDC techniques; the form of dc system is evolving from the point-to-point stand-alone dc links to the embedded HVDC system and the mul

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(10730034), Jonathan Ore. "The DC Nanogrid House: Converting a Residential Building from AC to DC Power to Improve Energy Efficiency." Thesis, 2021.

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<p></p><p>The modern U.S. power grid is susceptible to a variety of vulnerabilities, ranging from aging infrastructure, increasing demand, and unprecedented interactions (e.g., distributed energy resources (DERs) generating energy back to the grid, etc.). In addition, the rapid growth of new technologies such as the Internet of Things (IoT) affords promising new capabilities, but also accompanies a simultaneous risk of cybersecurity deficiencies. Coupled with an electrical network referred to as one of the most complex systems of all time, and an overall D+ rating from the American Society of

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Penner, Albert F. "Finite element computation of the DC corona currents injected into the AC conductors of a hybrid AC/DC transmission line." 1989. http://hdl.handle.net/1993/16935.

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Pan, Hsuan-Hung, and 潘宣宏. "An Implementation of Hybrid Three-Phase AC-DC Converter for Small-Scale Wind Turbines." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/42948283974183422720.

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碩士<br>國立成功大學<br>電機工程學系碩博士班<br>94<br>Due to the influence of the energy crisis and promotion of green power, many countries invest huge funds to conduct research on the renewable energy. Among the various energy source candidates, the most potential one is the wind-power generation. It is also the policy and developmental road map direction in our nation. However, the wind-power is not an unstable energy source. The output voltage and power of the wind-power generator may vary with the change of the wind speed. Therefore, promoting a stable and efficient wind-power generation has become a very

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Kjellander, Matilda, and Anders Tengvall. "Design of a small scale hybrid photovoltaic and wind energy system." Thesis, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-25710.

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Approaching problems with global warming due to the use of fossil fuels, means that new system solutions have to be investigated. This report investigates the possibility to expand an existing photovoltaic system with a wind turbine generator to simplify the expansion of renewable energy sources. Through an extensive literature study and simulation in SIMULINK the result has been developed and tested. It shows that it is possible to connect a wind turbine generator to the same inverter as the PV-modules if no MPPT algorithm for the PV-modules is integrated. To protect the inverter a dump load

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