Дисертації з теми "Ship Power System"
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Leghorn, Jeremy T. "Modeling for ship power system emulation." Thesis, Monterey, California. Naval Postgraduate School, 2009. http://hdl.handle.net/10945/4302.
Повний текст джерелаApproved for public release, distribution unlimited
With the U.S. Navy's continued focus on Integrated Fight Thru Power (IFTP) there has been an ever increasing effort to ensure an electrical distribution system that maintains maximum capabilities in the event of system faults. Non-Intrusive Load Monitoring (NILM), which has been used extensively for condition based maintenance applications, could simultaneously be used to enhance the existing zonal protection system employed with Multi-Function Monitors (MFM). A test platform with three 5000 watt synchronous generators is being constructed to emulate a U.S. Navy DDG 51 FLT IIA class ship electric plant. This is being accomplished in order to evaluate the feasibility of improving the fault isolation capabilities of the MFM with NILM implementation. The first step in this endeavor will be to electrically relate the test platform to the DDG electric plant. In order to accomplish this step, the fault simulation results from the test platform will be compared to simulated faults using U.S. Navy data from DDG 51 electric plants. This will allow for the fault isolation results from the test platform to be related to the DDG 51electric plant.
Leghorn, Jeremy T. (Jeremy Thomas). "Modeling for ship power system emulation." Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/50590.
Повний текст джерелаIncludes bibliographical references (p. 68).
With the U.S. Navy's continued focus on Integrated Fight Thru Power (IFTP) there has been an ever increasing effort to ensure an electrical distribution system that maintains maximum capabilities in the event of system faults. This is to ensure that the crew has the ability to complete real time tactical missions in the event of battle damage to any localized portions of the electrical distribution system. Fault isolation is a priority component of the U.S. Navy's Next Generation Integrated Power System (NGIPS) Roadmap, which lays out the framework as well as milestone dates for future development. Non-Intrusive Load Monitoring (NILM), which has been used extensively for condition based maintenance applications, could simultaneously be used to enhance the existing zonal protection system employed with Multi-Function Monitors (MFM). NILM may be able to, inexpensively, use the existing current and voltage sensors available from the MFM hardware to determine electrical loading which could allow for faster fault isolation capability. A test platform with three 5000 watt synchronous generators is being constructed to emulate a U.S. Navy DDG 51 FLT IIA class ship electric plant. This is being accomplished in order to evaluate the feasibility of improving the fault isolation capabilities of the MFM with NILM implementation. The first step in this endeavor will be to electrically relate the test platform to the DDG electric plant. In order to accomplish this step, the fault simulation results from the test platform will be compared to simulated faults using U.S. Navy data from DDG 51 electric plants.
(cont.) This will allow for the fault isolation results from the test platform to be related to the DDG 51 electric plant.
by Jeremy T. Leghorn.
S.M.
Nav.E.
Källman, Jonas. "Ship Power Estimation for Marine Vessels Based on System Identification." Thesis, Linköpings universitet, Reglerteknik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-79248.
Повний текст джерелаAkinnikawe, Ayorinde. "Investigation of broadband over power line channel capacity of shipboard power system cables for ship communications networks." Thesis, [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3155.
Повний текст джерелаStallings, Brad L. "Design of a ship service converter module for a reduced-scale prototype integrated power system." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2001. http://handle.dtic.navy.mil/100.2/ADA392078.
Повний текст джерелаThesis advisor(s): Ciezki, John G. ; Ashton, Robert W. "December 2001." Includes bibliographical references (p. 201-202). Also available in print.
Vicenzutti, Andrea. "Innovative Integrated Power Systems for All Electric Ships." Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3424463.
Повний текст джерелаOggigiorno, nelle grandi navi la propulsione elettrica è una valida alternativa a quella meccanica. Infatti, attualmente quest'ultima è limitata solo alle navi con requisiti particolari, quali la necessità di una elevata velocità di crociera o l’uso di combustibili specifici. L'uso della propulsione elettrica, in coppia con la progressiva elettrificazione dei carichi di bordo, ha portato alla nascita del concetto di All Electric Ship (AES). Una AES è una nave in cui tutti i carichi di bordo (propulsione inclusa) sono alimentati da un unico sistema elettrico, chiamato Sistema Elettrico Integrato (Integrated Power System - IPS). L'IPS è un sistema chiave in una AES, per cui richiede una progettazione ed una gestione accurata. In effetti, in una AES tale sistema alimenta quasi tutto, mettendo in evidenza il problema di garantire sia la corretta Power Quality, sia la continuità del servizio. La progettazione di un sistema così complesso viene convenzionalmente fatta considerando i singoli componenti separatamente, per semplificare il processo. Tuttavia tale pratica può portare a prestazioni ridotte, problemi di integrazione e sovradimensionamento. Come se non bastasse, la procedura di progettazione separata influisce pesantemente sull'affidabilità del sistema, a causa della difficoltà nel valutare l'effetto sulla nave di un guasto in un singolo sottosistema. Per questi motivi è necessario un nuovo processo di progettazione in grado di considerare l'effetto di tutti i componenti e sottosistemi del sistema, consentendo così di migliorare i più importanti driver applicati nella progettazione di una nave: efficienza, efficacia, affidabilità e riduzione dei costi. Date queste premesse, l'obiettivo della ricerca era di ottenere una nuova metodologia di progettazione applicabile al sistema elettrico integrato delle AES, in grado di considerare il sistema nel suo insieme, comprese tutte le sue interdipendenze interne. Il risultato di tale ricerca è descritto in questo lavoro di tesi, e consiste in un sub-processo che dovrà essere integrato nel processo di progettazione convenzionale del sistema elettrico integrato. In questa tesi viene effettuata un'ampia rassegna dello stato dell'arte, per consentire la comprensione del contesto, del perché tale processo innovativo è necessario e quali tecniche innovative possono essere utilizzate come un aiuto nella progettazione. Ogni punto è discusso concentrandosi sullo scopo di questa tesi, presentando così argomenti, bibliografia, e valutazioni personali volte ad indirizzare il lettore a comprendere l'impatto del processo di progettazione proposto. In particolare, dopo un primo capitolo dedicato all’introduzione delle AES in cui sono descritte come tali navi si sono evolute e quali sono le applicazioni più impattanti, si effettua una discussione ragionata sul processo di progettazione convenzionale delle navi, contenuta nel secondo capitolo. In aggiunta a questo viene effettuata un'analisi approfondita del processi di progettazione dell’IPS, per spiegare il contesto in cui il processo di progettazione innovativo deve essere integrato. Alcuni esempi di problemi derivanti dal processo di progettazione tradizionale sono dati, per motivare la proposta di un processo nuovo. In aggiunta ai problemi dovuti alla progettazione, altre motivazioni portano alla necessità di un rinnovato processo di progettazione, quali l'imminente introduzione di sistemi di distribuzione innovativi a bordo nave e la recente comparsa di nuovi requisiti il cui impatto sull’IPS è significativo. Per questo, un excursus su questi due temi è fatto nel terzo capitolo, con riferimento alle più recenti fonti letterarie e ricerche. Il quarto capitolo è dedicato alla descrizione degli strumenti che verranno utilizzati per costruire l'innovativo processo di progettazione. La prima parte del capitolo è dedicata alla teoria della fidatezza (dependability), in grado di dare un approccio sistematico e coerente alla determinazione degli effetti guasti sui sistemi complessi. Attraverso la teoria della fidatezza e le sue tecniche è possibile: determinare l'effetto sul sistema dei guasti ai singoli componenti; valutare tutte le possibili cause di un dato evento di avaria; valutare alcuni indici matematici relativi al sistema, al fine di confrontare diverse soluzioni progettuali; definire dove e come il progettista deve intervenire per migliorare il sistema. La seconda parte del quarto capitolo è dedicata ai software per la simulazione del comportamento dell’IPS ed ai test hardware-in-the-loop. In particolare viene discusso l'uso di tali sistemi come aiuto nella progettazione di sistemi di potenza, per permettere di comprendere perché tali strumenti sono stati integrati nel processo di progettazione sviluppato. Il quinto capitolo è dedicato al processo di progettazione sviluppato nel corso della ricerca. Viene discusso come tale processo funziona, come dovrebbe essere integrato nel processo di progettazione convenzionale, e qual è l'impatto che esso ha sulla progettazione. In particolare, la procedura sviluppata implica sia l'applicazione delle tecniche proprie della teoria della fidatezza (in particolare la Failure Tree Analysis), sia la simulazione del comportamento dinamico dell’IPS attraverso un modello matematico del sistema tarato sui transitori elettromeccanici. Infine, per dimostrare l'applicabilità della procedura proposta, nel sesto capitolo viene analizzato un caso di studio: l'IPS di una nave da perforazione offshore oil & gas dotata di posizionamento dinamico. Questo caso di studio è stato scelto a causa dei requisiti molto stringenti di questa classe di navi, il cui impatto sul progetto dell’IPS è significativo. Viene presentata l'analisi dell’IPS tramite la tecnica di Fault Tree Analysis (anche se con un livello di dettaglio semplificato), seguita dal calcolo di diversi indici di affidabilità. Tali risultati, unitamente a norme e regolamenti vigenti, sono stati utilizzati per definire i dati di input per le simulazioni, effettuate utilizzando un modello matematico dell’IPS costruito appositamente. I risultati delle simulazioni hanno consentito di valutare come il sistema dinamicamente si porta all’avaria a partire dai guasti rilevanti, e pertanto di proporre soluzioni migliorative.
Nord, Thomas. "Voltage Stability in an Electric Propulsion System for Ships." Thesis, KTH, Elektriska energisystem, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-118932.
Повний текст джерелаRadan, Damir. "Integrated Control of Marine Electrical Power Systems." Doctoral thesis, Norwegian University of Science and Technology, Faculty of Engineering Science and Technology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1984.
Повний текст джерелаThis doctoral thesis presents new ideas and research results on control of marine electric power system.
The main motivation for this work is the development of a control system, power management system (PMS) capable to improve the system robustness to blackout, handle major power system faults, minimize the operational cost and keep the power system machinery components under minimal stress in all operational conditions.
Today, the electric marine power system tends to have more system functionality implemented in integrated automation systems. The present state of the art type of tools and methods for analyzing marine power systems do only to a limited extent utilize the increased knowledge available within each of the mechanical and electrical engineering disciplines.
As the propulsion system is typically consisted of the largest consumers on the vessel, important interactions exists between the PMS and vessel propulsion system. These are interacted through the dynamic positioning (DP) controller, thrust allocation algorithm, local thruster controllers, generators' local frequency and voltage controllers. The PMS interacts with the propulsion system through the following main functions: available power static load control, load rate limiting control and blackout prevention control (i.e. fast load reduction). These functions serve to prevent the blackout and to ensure that the vessel will always have enough power.
The PMS interacts with other control systems in order to prevent a blackout and to minimize operational costs. The possibilities to maximize the performance of the vessel, increase the robustness to faults and decrease a component wear-out rate are mainly addressed locally for the individual control systems. The solutions are mainly implicative (for e.g. local thruster control, or DP thrust allocation), and attention has not been given on the interaction between these systems, the power system and PMS. Some of the questions that may arise regarding the system interactions, are as follows: how the PMS functionality may affect a local thruster control, how the local thruster control may affect the power system performance, how some consumers may affect the power system performance in normal operations and thus affect other consumers, how the power system operation may affect the susceptibility to faults and blackout, how various operating and weather conditions may affect the power system performance and thus propulsion performance though the PMS power limiting control, how propulsion performance may affect the overall vessel performance, which kind of faults can be avoided if the control system is re-structured, how to minimize the operational costs and to deal with the conflicting goals. This PhD thesis aims to provide answers to such questions.
The main contributions of this PhD thesis are:
− A new observer-based fast load reduction system for the blackout prevention control has been proposed. When compared to the existing fast load reduction systems, the proposed controller gives much faster blackout detection rate, high reliability in the detection and faster and more precise load reduction (within 150 miliseconds).
− New advanced energy management control strategies for reductions in the operational costs and improved fuel economy of the vessel.
− Load limiting controllers for the reduction of thruster wear-out rate. These controllers are based on the probability of torque loss, real-time torque loss and the thruster shaft
accelerations. The controllers provide means of redistributing thrust from load fluctuating thrusters to less load fluctuating ones, and may operate independently of the thrust allocation system. Another solution is also proposed where the load limiting controller based on thrust losses is an integrated part of DP thrust allocation algorithm.
− A new concept of totally integrated thrust allocation system, local thruster control and power system. These systems are integrated through PMS functionality which is contained within each thruster PLC, thereby distributed among individual controllers, and independent of the communications and dedicated controllers.
− Observer-based inertial controller and direct torque-loss controller (soft anti-spin controller) with particular attention to the control of machine wear-out rate. These controller contribute to general shaft speed control of electrical thrusters, generators and main propulsion prime movers.
The proposed controllers, estimators and concepts are demonstrated through time-domain simulations performed in MATLAB/SIMULINK. The selected data are typical for the required applications and may differ slightly for the presented cases.
Duvoor, Prashanth. "Energy storage system requirements for shipboard power systems supplying pulsed power loads." Master's thesis, Mississippi State : Mississippi State University, 2007. http://library.msstate.edu/etd/show.asp?etd=etd-11082007-170421.
Повний текст джерелаWu, Jian. "Data modeling for Shipboard Power System." Master's thesis, Mississippi State : Mississippi State University, 2004. http://library.msstate.edu/etd/show.asp?etd=etd-03252004-220340.
Повний текст джерелаYu, Qiuli. "Multi-agent systems for reconfiguration of shipboard integrated power system including AC-DC zonal distribution system." Diss., Mississippi State : Mississippi State University, 2008. http://library.msstate.edu/etd/show.asp?etd=etd-11072008-122943.
Повний текст джерелаSarris, Emmanouil. "Naval ship propulsion and electric power systems selection for optimal fuel consumption." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/68573.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (p. [100]-102).
Although propulsion and electric power systems selection is an important part of naval ship design, respective decisions often have to be made without detailed ship knowledge (resistance, propulsors, etc.). Propulsion and electric power systems have always had to satisfy speed and ship-service power requirements. Nowadays, increasing fuel costs are moving such decisions towards more fuel-efficient solutions. Unlike commercial ships, naval ships operate in a variety of speeds and electric loads, making fuel consumption optimization challenging. This thesis develops a flexible decision support tool in Matlab® environment, which identifies the propulsion and ship-service power generation systems configuration that minimizes fuel consumption for any ship based on its operating profile. Mechanical-driven propulsion systems with or without propulsion derived ship-service power generation, separate ship-service systems and integrated power systems are analyzed. Modeling includes hull resistance using the Holtrop-Mennen method requiring only basic hull geometry information, propeller efficiencies using the Wageningen B series and transmission and prime movers fuel efficiencies. Propulsion and ship-service power generation systems configuration is optimized using the genetic algorithm. US Navy's Advanced Surface Ship Evaluation Tool (ASSET) model for the DDG-51 Flight I destroyer was used for modeling validation. Optimal fuel consumption results are compared against the existing configuration for the DDG-51 Flight I destroyer using a representative operating profile.
by Emmanouil Sarris.
S.M.in Engineering and Management
Nav.E.
da, Rin Aldo. "Integrated Power Systems in All Electric Ships: Dependability Oriented Design." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3424051.
Повний текст джерелаQuesto lavoro si prefigge lo scopo di definire in maniera quanto piu’ possibile standardizzata e definita nel corpus delle regole internazionali la disciplina della progettazione volta alla fidatezza di impianti integrati di produzione, distribuzione ed utilizzo dell’energia elettrical a bordo di navi a propulsione elettrica. L’approccio proposto si fonda nei piu’ recenti sviluppi della teoria della fidatezza, che coinvolgono il lessico, la tassonomia, fino agli strumenti di analisi e di quantificazione degli attributi. Tali sviluppi sono al vaglio della comunita’ internazionale, ma gia’ un importante consenso e’ stato raggiunto. La prima parte contiene un’analisi dettagliata dello stato normativo attualmente in vigore che disciplina la progettazione di un impianto elettrico integrato. I documenti normativi analizzati sono principalmente: la specifica tecnica armatoriale, i regolamenti delle societa’ di classifica ed il corpus di regole degli enti internazionali. L’analisi si concentra sulla definizione dei sistemi, sia dal punto di vista tassonomico, funzionale e di requisiti in termini di reazione ad un predefinito insieme di condizioni di guasto. La seconda parte riporta un breve sunto della teoria della fidatezza, nella sua piu’ recente definizione. Si fa accenno al lessico, definito in maniera stringente, alla tassonomia ed alle tecniche di analisi e di sintesi della fidatezza. In questo contesto si attira l’attenzione sul fatto che i documenti analizzati nella parte precedente fanno sovente riferimento agli elementi della teoria della fidatezza, senza pero’ considerarne appieno il significato e le ricadute che la teoria offre. La teoria funge da substrato che integra la documentazione, altrimenti frammentaria e priva della necessaria precisione, in un unico insieme autocontenuto. La terza parte riporta un’applicazione dei concetti analizzati nella prima parte, rielaborati alla luce di quanto discusso nella seconda, ad un caso pratico: un impianto elettrico integrato di una nave da crociera di recente costruzione. L’applicazione, pur soffrendo di una importante mancanza d’informazioni, dovuta a vincoli di copyright e di protezione del know how aziendale, ha evidenziato la struttura del metodo e la sua esaustivita’. Il risultato dell’applicazione e’ un modello che permette lo studio preventivo della fidatezza del sistema in fase di progettazione e il rapido controllo del rispetto dei limiti imposti in termini di reazione ai guasti previsti dalle norme. Nonostante i vincoli posti, il modello ed il relativo sistema di indagine hanno offerto spunti interessanti ed innovativi rispetto a componenti il cui comportamento in caso di guasto era stato erroneamente trascurato. La quarta parte riprende i risultati ottenuti nella terza, ed offre implemetazioni alternative volte ad ottenere una maggiore fidatezza. Il raggiungimento di una maggiore fidatezza e’ vincolato al calcolo del relativo indice pertinente alla nuova proposta. In tal guisa il metodo offre la possibilita’ di comparare diverse archietture e di classificarle secondo un criterio univoco, ossia il valore dell’indice di fidatezza scelto. La quinta parte, infine, offre spunti per indirizzare la ricerca futura. L’analisi dei sistemi e dei loro requisiti ha reso evidente la necessita’ di muoversi su diversi fronti: dalla definizione sempre piu’ stringente ed esaustiva dei termini, inseriti nel loro contesto, allo sviluppo di nuovi componenti atti a svolgere un servizio piu’ completo, per quanto riguarda certi aspetti della loro fidatezza (rilevabilita’). Il lavoro riporta alcuni elementi di gestione dei progetti e di legislazione marittima che sono parte intergrante dell’ambiente in cui il progetto dei sistemi elettrici integrati si sviluppa. Cio’ e’ dovuto al fatto che la fidatezza e’ un insieme di attributi e qualita’ che travalica la pura ingegneria, ma sconfina nel campo della legislazione, dell’assicurazione dei rischi e financo nella gestione dei progretti. Si crede che il contesto creato dall’analisi di fidatezza possa costituire un comune sostrato per l’interazione di molteplici discipline, quali appunto la gestione di progetti, la legislazione e la gestione del rischio, tendente a favorire il dialogo e la reciproca comprensione.
Swanberg, Boone Thomas. "A Heuristic Approach To Designing A Unique Ships Grid With Energy Storage for the Future Fleet of River Tender Ships." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/84397.
Повний текст джерелаMaster of Science
Amann, Nicholas Paul. "Adaptive overcurrent protection scheme for shipboard power systems." Master's thesis, Mississippi State : Mississippi State University, 2004. http://library.msstate.edu/etd/show.asp?etd=etd-06282004-140248.
Повний текст джерелаBosich, Daniele. "Medium Voltage DC integrated power systems for large all electric ships." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3423756.
Повний текст джерелаLa distribuzione in media tensione continua (Medium Voltage Direct Current, MVDC) rappresenta una tecnologia promettente per i sistemi elettrici navali del futuro. A tal riguardo, negli ultimi anni, università e centri di ricerca hanno proposto soluzioni tecniche tali da raggiungere gli obiettivi propri della tecnologia MVDC: fra gli altri, risparmio di carburante, riduzione del peso/ingombro dell’impianto elettrico, riconfigurabilità a fronte di guasti e miglioramento della power quality. D’altra parte, la più grande sfida da affrontare riguarda la regolazione della tensione che deve risultare in grado di garantire il requisito fondamentale della stabilità. Relativamente a questo aspetto, una possibile instabilità si manifesta in presenza di convertitori di carico a banda elevata, modellizzabili come carichi a potenza costante (Constant Power Loads, CPLs). Tali carichi non-lineari vengono visti dal sistema come resistenze incrementali negative, le quali rappresentano la causa dell’instabilità della tensione a fronte di un disturbo (per esempio connessione di carico, disconnessione di un sistema di genenerazione). La tesi è stata realizzata presso il Laboratorio Grid Connected and Marine Electric Power Generation and Control (EPGC Lab.), presso l’Università degli Studi di Trieste. Lo scopo è quello di sviluppare strategie per il controllo della tensione in grado di risolvere la questione CPL, considerando un possibile impianto elettrico integrato (multi-convertitore) in MVDC, convenientemente progettato a partire dalla distribuzione reale MVAC di una nave da crociera. Nel sistema visto, l’instabilità di tensione può essere affrontata secondo diversi approcci, sfruttando soluzioni impiantistiche (aggiunta di filtraggio dedicato, aggiunta di energy storage) oppure soluzioni controllistiche. Il secondo approccio è quello seguito nella presente tesi: gli attuatori di tensione (convertitori DC/DC) vengono usati in questo caso per compensare l’instabilità di tensione. Quindi, da una parte (lato carico) i convertitori sono responsabili del problema dei carichi non-lineari, dall’altro (lato generatori) possono essere utilizzati per contribuire alla sua soluzione, garantendo un comportamento stabile. L’approccio stabilizzante previsto prevede l’utilizzo di diverse tecniche di controllo, analizzate nella tesi dal punto di vista teorico. A partire dalla tecnica semplice State Feedback (SF), altre due tecniche sono state studiate per il caso di sistema multi-converter, ovvero l’Active Damping (AD) e il Linearization via State Feedback (LSF). L’AD è un metodo di controllo per incrementare transitorialmente la resistenza dei filtri, in modo tale da smorzare le oscillazioni di tensione: uno dei principali vantaggi è quello relativo alla semplice ingegnerizzazione su controllori digitali, mentre lo svantaggio riguarda la limitata azione stabilizzante. Pertanto, strategie basate sull’AD devono considerarsi valide per stabilizzare sistemi non critici. D’altra parte, LSF è una tecnica molto valida per ottenere una buona cancellazione delle non-linearità dei CPL, per mezzo dell’azione di convertitori DC/DC in grado di applicare un’opportuna funzione di controllo non-lineare. A fronte di una notevole capacità nello stabilizzare sistemi critici, grande attenzione va posta nella stima della funzione di controllo: conoscenza inaccurata dei parametri o errori nei feedback ai controllori possono invalidare l’approccio LSF, causando una parziale cancellazione, quindi un sistema risultante non-lineare. Le simulazioni finali hanno lo scopo di testare le tecniche AD e LSF, implementate in strategie di controllo locale e globale: la prima strategia ha lo scopo di risolvere l’instabilità direttamente sui CPL, mentre la seconda assicura la stabilità del bus.
Sfakianakis, Konstantinos. "Design for safety and energy efficiency of electrical power systems in ships." Thesis, University of Strathclyde, 2016. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=27571.
Повний текст джерелаBorisov, Konstantin A. "Multifunctional voltage source converter for shipboard power systems." Diss., Mississippi State : Mississippi State University, 2007. http://library.msstate.edu/etd/show.asp?etd=etd-06042007-142951.
Повний текст джерелаVieira, Giovani Giulio Tristão Thibes. "Hybrid powertrains analysis for ship propulsion using energy storage." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-17122018-090614/.
Повний текст джерелаAs emissões dos navios já ocupam a oitava posição entre os países com maior emissão no mundo. Isso pode ser explicado pelo fato de que as operações dos navios têm uma grande variação de demanda de potência, com isso a operação inteligente dos geradores a diesel é fundamental para a redução das emissões. A abordagem desenvolvida nesse trabalho integra o uso de sistemas de armazenamento avançados na operação dos geradores a diesel. A variação do ponto de operação dos geradores a diesel interfere diretamente no consumo e nas emissões, essa variação só é possível por meio do controle de frequência e tensão providos pelo sistema de armazenamento de energia. Nesse trabalho foram analisados o uso de baterias de lítio para diferentes pontos de operação do gerador a diesel. O uso das baterias possibilitou a operação dos geradores num melhor ponto de carga com isso houve uma redução das emissões e do consumo de combustível. Os resultados encontrados nesse trabalho podem ser extrapolados qualitativamente para outros sistemas de potência offshore, como plataformas de petróleo e de perfuração, que operem com sistemas de baterias avançadas e geradores a diesel.
Khaniya, Dina. "Development of three-phase continuation power flow for voltage stability analysis of distribution systems." Master's thesis, Mississippi State : Mississippi State University, 2008. http://library.msstate.edu/etd/show.asp?etd=etd-11142008-101009.
Повний текст джерелаZhang, Yujie. "Model-based design of a protection scheme for shipboard power systems." Master's thesis, Mississippi State : Mississippi State University, 2008. http://library.msstate.edu/etd/show.asp?etd=etd-09292008-124423.
Повний текст джерелаPalla, Sunil Kumar. "Development of overcurrent relay model and power system simulator using National Instruments devices in real-time." Master's thesis, Mississippi State : Mississippi State University, 2008. http://library.msstate.edu/etd/show.asp?etd=etd-09252008-094620.
Повний текст джерелаLing, Chin Janie. "Life cycle assessment of marine power systems onboard roll-on/roll-off cargo ships : framework and case studies." Thesis, University of Newcastle upon Tyne, 2016. http://hdl.handle.net/10443/3432.
Повний текст джерелаFrancis, Gerald. "A Synchronous Distributed Digital Control Architecture for High Power Converters." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/31942.
Повний текст джерела
This thesis proposes a synchronous digital control architecture that allows for the communication and control of devices via a fiber optic communication ring using digital technology. The proposed control architecture is a multidisciplinary approach consisting of concepts from several areas of electrical engineering. A review of the state of the art is presented in Chapter 2 in the areas of power electronics, fieldbus control networks, and digital design. A universal controller is proposed as a solution to the hardware independent control of these converters. Chapter 3 discusses how the controller was specified, designed, implemented, and tested. The power level specific hardware is implemented in modules referred to as hardware managers. A design for a hardware manager was previously implemented and tested. Based on these results and experiences, an improved hardware manager is specified in Chapter 4. A fault tolerant communication protocol is specified in Chapter 5. This protocol is an improvement on a previous version of the protocol, adding benefits of improved synchronization, multimaster support, fault tolerant structure with support for hot-swapping, live insertion and removals, a variable ring structure, and a new network based clock concept for greater flexibility and control. Chapter 6 provides a system demonstration, verifying the components work in configurations involving combinations of controllers and hardware managers to form applications. Chapter 7 is the conclusion. VHDL code is included for the controller, the hardware manager, and the protocol. Schematics and manufacturing specifications are included for the controller.
Master of Science
Hamilton, Hymiar. "An impact study of DC protection techniques for shipboard power systems." Master's thesis, Mississippi State : Mississippi State University, 2007. http://library.msstate.edu/etd/show.asp?etd=etd-07062007-144823.
Повний текст джерелаAbell, Barry J. "Planning concepts to sustain, develop, and test complex naval combat systems at the Surface Combat Systems Center, Wallops Island, Virginia." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Mar%5FAbell.pdf.
Повний текст джерелаThesis Advisor(s): Scott Carlson, Benjamin Roberts. Includes bibliographical references (p. 145-152) Also available online.
Aktosun, Erdem. "Identification of hydrodynamic forces developed by flapping fins in a watercraft propulsion flow field." ScholarWorks@UNO, 2014. http://scholarworks.uno.edu/td/1900.
Повний текст джерелаLAVIOLA, MICHELE. "LNG as the future marine fuel, Waste Heat Recovery Systems & Cold Ironing solutions for eco-friendly maritime transport." Doctoral thesis, Università degli studi di Genova, 2018. http://hdl.handle.net/11567/930196.
Повний текст джерелаRUVIO, ALESSANDRO. "Distortion and faults detection in shipboard AC/DC power distribution system." Doctoral thesis, 2019. http://hdl.handle.net/11573/1237720.
Повний текст джерелаYeh, Tsang-Bin, and 葉倉賓. "A Study of Keelung Harbor Shore Power System for Cruise Ship." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/76r6c5.
Повний текст джерела國立臺灣海洋大學
河海工程學系
104
Marine transportation played an important role in global economic development, due to the trend of globalization of world economic activity. As the carrier ship transport of goods was growing rapidly and cruise market was also booming, so the development of ship oriented toward the large-scale and shipping sailings also increased substantially at the same time. But the exhaust emissions from ships also caused a lot of air pollution and had a huge impact punch to the environmental of port and coastal areas. Because of the terrain environment that Keelung Harbor goes deep into Keelung downtown area and port area is close to the urban, the above problems affect us seriously. The air quality issues are more worthy of attention. In recent years, the number of Keelung inbound and outbound vessels and total tonnage of vessels remained stablely, no significant growth, but the number of cruise passengers to Keelung increased steadily. Comparing the numbers of visitors who were inbound and outbound at different international harbor in Taiwan,the numbers of visitors in Keelung were always majority except that in Kaohsiung was majority in 2006. It shows the booming trend of cruise industry in Keelung Harbor. For reducing air pollution and greenhouse gas emissions at harbor area, one important way is to use the shore power system when ship berthing. This study explores the technical feasibility and cost benefit analysis of the cruise ship shore power system, oil analysis, load analysis, contract capacity, electricity and pollution reduction benefit assessment by using of shore power system for cruise ship at the ferry terminal of Keelung harbor.
YEN, TSUNG-HUI, and 顏聰輝. "Measurement and Improvement of Low Frequency EMI for Ship Power System." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/94217019520539394718.
Повний текст джерелаLu, Shao-Bin, and 盧紹賓. "A Power Supply System with Digital Controller Applied in Deep Sea Exploration Ship." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/9s934w.
Повний текст джерела國立臺灣科技大學
電機工程系
106
This thesis is about a power supply system applied in deep sea exploration ship, including a 350V/300V DC/DC converter, a 350V/24V DC/DC converter and a driver system of 4-polar conductivity meter. The DC/DC converter is structured by Full-Bridge LLC circuit with two paralleled module to increase the output power up to 2 kW. The digital controller captures the voltage, current feedback and calculates the variations. In order to stabilize the output voltage, the frequency modulation technique is used to reach the required level, and duty control is employed to balance the output current of two power module. Also, the thesis uses the resonant inductor, resonant capacitor and parasitic components in transformer to form a resonant tank. It can achieve the zero-voltage switching to decrease the power loss of switching under desired load conditions. Finally, the testing result shows that the efficiency of the whole system is above 80 %, and the maximum is up to 95.7 %. Moreover, a 24V/1.2V DC/DC converter is implemented to drive the four-polar conductivity meter. We can sense the current of the current electrode, and the voltage of the voltage electrode and convert these signals to digital codes by ADC. After that, these converted information will be delivered throughout SCI (serial communication interface) and be sent to the ship for reading and storing the conductivity of seawater.
Pruske, Matthew Andrew. "Thermal-electrical co-simulation of shipboard integrated power systems on an all-electric ship." Thesis, 2009. http://hdl.handle.net/2152/ETD-UT-2009-08-317.
Повний текст джерелаtext
Feng, Xianyong. "A Bio-Inspired Multi-Agent System Framework for Real-Time Load Management in All-Electric Ship Power Systems." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-11031.
Повний текст джерелаKim, Taekhyun 1977. "Polyspectral signal analysis techniques for interharmonics in shipboard power systems." 2008. http://hdl.handle.net/2152/17921.
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Shagar, V. "Transient suppression in hybrid electric ship power systems." Thesis, 2019. https://eprints.utas.edu.au/31901/1/Shagar_whole_thesis.pdf.
Повний текст джерелаLin, Cheng-Wei, and 林承緯. "Harmonic Analysis and Improvement in Electric Ship Power Systems." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/22075459521243858754.
Повний текст джерела國立高雄海洋科技大學
輪機工程研究所
96
Abstract More and more power electronic converter equipment such as adjustable speed drivers (ASDs) and single/three phase power converters are used in a shipboard for electric motor driver and various power supply applications due to advanced technology in power semiconductor switching devices in the recent years. These power converters that are nonlinear loads can produce non-sinusoidal distorted currents and these currents are then delivered and broadcasted through the power network and therefore bus voltages are distorted. This thesis aims to build a set of analysis model for analysis and improvement of power harmonics in the shipboard. A harmonic power flow analysis technology is used to estimate each order and total harmonic distortion (THD) of harmonic voltages in the ship with distorted current injections at different locations. Based on the analysis results, suitable passive filters are designed to reduce the harmonic distortion according to shipboard harmonic regulations. Two practical power systems of electric propulsion and container vessels under different operating situations are used for the study. The test results and proposed analysis model can provide electrical engineers useful information in planning or designing shipboard harmonic mitigation measures. Keywords: Shipboard electric power system, Power Electronics, Power Converter, Harmonics, Harmonic power flow, Filter.
Chen, Jr-Liang, and 陳智良. "Short-Circuit Current Analysis for Ship Shore Power Connection Systems." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/6ju73t.
Повний текст джерела國立高雄海洋科技大學
輪機工程研究所
102
Ship shore power connection issue is essential and important for green port and clean harbor city around the world. From a whole grid point of view, the ship electric power system is connected to the onshore grid to become a part of onshore power networks through the shore power connection, which has increased the complexity of the short-circuit current analysis of ship power systems. To exactly calculate short-circuit currents at different fault points in the system for determining proper breaking capacity protection devices, this paper proposes a set of analysis model for the short-circuit current analysis for ship shore power connections. Two possible calculation methods, which include IEC std. 60909-0 and combining with IEC std. 60909-0 and IEC std. 61363-1, are developed and used to calculate the short-circuit currents in the system connected to onshore power grids. A practical ship shore power connection system is selected to ensure and demonstrate the performance of proposed methods.
Huang, Chien-Jui, and 黃健瑞. "Analysis of U.S. Naval Ships' Power Distribution Systems." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/08140586015054877421.
Повний текст джерела崑山科技大學
電機工程研究所
101
With the consequences of trade growth and economic development, ships are getting bigger with size and equipped with automatic devices resulting in consuming a lot of electrical power. Usually, the ship is equipped with 2 or 4 power generators and operates them depending on the need through single operation or parallel operation. Ships’ Power Distribution Systems is an independent working component in a ship, where in the power consumption from small devices to heavy machines are loaded on electrical power system, and could thus cause variations on current, voltage and frequency there of. The main motivation for this work is the operational analysis of marine power system; the analysis shows that two turbine generators run in parallel in accordance with three common operational conditions, and it models dynamic response with the application of Matlab / Simullnk. This thesis presents a model on dynamic response analysis in Ships’ Power Distribution Systems for builders to design a Turbine-Generator system in ship.
Lee, Yung-Chi, and 李永濟. "A Study on Line Voltage Drop Analysis for Ship Shore Power Connection Systems." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/80804923084562186383.
Повний текст джерела國立高雄海洋科技大學
輪機工程研究所
104
Among the demonstration systems of green ports and clean harbor cities promoted around the world, the vessel high voltage shore connection (HVSC) system is one of the most important. In terms of overall power grid, when the vessel power system becomes a part of the onshore power grid, the onshore power distribution system exhibits voltage fluctuations due to line or load variation, thus influencing service performance and life of the electrical equipment. In a ship-to-shore power connection system, if the voltage fluctuation or line voltage drop is too large, then the service performance and life of the equipment on the ship are also impacted, and a parallel arrangement for vessel power and shore power will fail in a parallel connection or disconnection due to excessive voltage fluctuations. To design effective shore power connection equipment with adequate capacity and power quality for port construction, a set of analysis model for line voltage drop calculation is proposed in this thesis. Test results of a practical shore power connection system are presented to validate and demonstrate the performance of proposed method. Test results show that the line voltage drop in the shore power connection is influenced by ship load, the power factor, cable length, and cable diameter, and the line voltage drop is proportional to ship load, line length, and cable diameter and inversely proportional to the power factor. Comparing these influential factors, the power factor has a stronger effect on the line voltage drop, followed by ship load and line length, while the cable diameter has a slight effect on the line voltage drop.
Stevens, McKay Benjamin. "Designing shipboard electrical distribution systems for optimal reliability." Thesis, 2013. http://hdl.handle.net/2152/23576.
Повний текст джерелаtext
Su, Hsin-Yi, and 蘇信益. "Improvement of Short Circuit Currents Using Fault Current Limiter in Electric Ship Power Systems." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/85856007822862710216.
Повний текст джерела國立高雄海洋科技大學
輪機工程研究所
96
Abstract The ship automation and large-scale developments have forced more and more electrical equipment to be installed for enhancing the marine shipping economic competition. On the other hand, many ship building corporations worldwide has paid more attentions to all-electric ships due to the significant gains in terms of a more flexible solution for energy shortage, exhaust emission and large-scale cargos realized from this type of ship. Since larger capacities of power generations and electric loads are used in these two types of ships, large short circuit currents can degrade the system security when the system faulted. When the existing power protection devices cannot accommodate the fault currents or the suitable devices are not available, how to reduce the fault currents becomes an important task for the shipboard power system design and operations. Many countries have studied the advantages of fault current limiters (FCLs) that are one of the effective strategies for system protection and short circuit improvement and used them to reduce fault currents in a power network for system security purpose. This thesis aims to investigate the application of FCLs to shipboard fault current improvement. The benefits and placement of FCLs installation for the ship application are studied. The suitable FCLs locations are determined by simulations and the impedance matrix modify method is used for FCLs design. Test results of two different types of ship power systems are reported to illustrate the FCLs placement and improvement effectiveness. Keywords: Shipboard electric power system, All-electric ship, Short circuit current, Fault current limiter.
Lan, Tsung-Kai, and 藍琮凱. "Multi-Agent Systems for Service Power Restoration Enhancement in Ships." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/45512014000480770096.
Повний текст джерела國立高雄海洋科技大學
輪機工程研究所
99
Service restoration during a fault in ship electric power systems due to external forces or internal faults is an important task for future ship power systems design. To enhance the system reliability, this thesis aims to utilize a multi-agent system (MAS) based technique to build an effective service restoration strategy for performing fault isolation and restoration by feeder reconfigurations. When a fault in the system is detected and isolated, an appropriate restoration plan is derived by power electronic building blocks (PEBBs) used in the MAS to determine the restoration priority of feeders and sectionalizing loads according to the system emergency operation standard. To ensure the performance of the proposed method, two common ship distribution systems including radial and ring schemes and a practical ship electric distribution system are used for computer simulations. Simulation results have shown that with the MAS based ship service power restoration, the appropriate strategy can be promptly determined and executed for service restoration for enhancing system reliability.
Uriarte, Fabian Marcel. "A Partitioning Approach for Parallel Simulation of AC-Radial Shipboard Power Systems." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7729.
Повний текст джерелаKulkarni, Saurabh Shirish. "Fault location and characterization in AC and DC power systems." 2012. http://hdl.handle.net/2152/22121.
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Lin, Jun-Yi, and 林峻毅. "Analyzing the Penetration of Stochastic Harmonic Outputs of Ship-to-Shore Container Cranes to Power Supply Systems." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/17919684997213083907.
Повний текст джерела義守大學
電機工程學系碩士班
98
Ship-to-shore container cranes are not only the major equipment of shipment of ocean transportation but also their processes are important to reduce freight time. Container cranes use inverters to control large AC/DC motors to achieve various actions of loading or unloading containers. However large inverters and large AC/DC motors have non-linear load characteristics, those characteristics will produce large amounts of harmonic currents when the equipment works. The harmonic currents produced will propagate through power systems, affect other electrical equipment, make the voltage waveform distorted and influence the wharf power quality. Besides, the movements of ship-to-shore crane have stochastic characteristics; the stochastic characteristics must be considered in the harmonic analysis. This thesis investigates the behaviors of stochastic harmonic sources caused by container cranes and their penetrations to power supply systems. In order to analyze the stochastic behaviors of container cranes in detail, the movements of container crane are divided into ten stages. A power quality recorder is used to record the voltage, current, power, harmonic etc. of each stage. The time distribution of each stage can also be investigated accordingly. Base on the measured data and time distribution of each stage, a comprehensive analysis can be achieved. Test results demonstrate the significance of the proposed method.
Tyler, John. "A Pragmatic Standard of Legal Validity." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10885.
Повний текст джерела