Dissertationen zum Thema „Multi-fuel cell stacks system“
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Hard, Kevin. „PEM fuel cell multi-phase system“. Thesis, University of Nottingham, 2005. http://eprints.nottingham.ac.uk/13198/.
Der volle Inhalt der QuelleSanchez, Antonio. „Energy management in electric systems fed by fuel cell stacks“. Phd thesis, Université Paris Sud - Paris XI, 2011. http://tel.archives-ouvertes.fr/tel-00590217.
Der volle Inhalt der QuelleMiller, Matthew Michael. „Modeling, Designing, Building, and Testing a Microtubular Fuel Cell Stack Power Supply System for Micro Air Vehicle (MAVs)“. Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/76880.
Der volle Inhalt der QuelleMaster of Science
Erkan, Serdar. „Development Of 100w Portable Fuel Cell System Working With Sodium Borohydride“. Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613564/index.pdf.
Der volle Inhalt der Quelleultrasonic spray coating technique&rdquo
is developed for membrane electrode assembly (MEA) manufacturing. New metal and graphite bipolar plates are designed and manufactured by CNC technique. A fuel cell controller hardware is developed for fuel supply and system control. The power densities reached with the new method are 0.53, 0.74, 0.77, and 0.88 W/cm2 for 20%, 40%, 50%, 70% Pt/C catalyst by keeping 0.4mg Pt/cm2 platinum loading constant, respectively. The power density increase is 267% compared to &ldquo
spraying of catalyst ink with air pressure atomizing spray gun&rdquo
. All parts of the PEM fuel cell stack designed were produced, assembled, and tested. The current density reached is 12.9A at 12 V stack potential and the corresponding electrical power of the stack is 155W.
Wu, Xinying. „Reliability Assessment of a Continuous-state Fuel Cell Stack System with Multiple Degrading Components“. Ohio University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1556794664723115.
Der volle Inhalt der QuelleSundaresan, Meenakshi. „A thermal model to evaluate sub-freezing startup for a direct hydrogen hybrid fuel cell vehicle polymer electrolyte fuel cell stack and system /“. For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2004. http://uclibs.org/PID/11984.
Der volle Inhalt der QuelleYin, Liangzhen. „Intelligent control for performance optimization of proton exchange membrane fuel cell system“. Electronic Thesis or Diss., Bourgogne Franche-Comté, 2023. http://www.theses.fr/2023UBFCA013.
Der volle Inhalt der QuelleProton exchange membrane fuel cell (PEMFC) system has been considered as the new power generation technology as it has the advantage of high power density, zero emission, high efficiency, and fast start-up characteristics. Therefore, this thesis is devoted to researching system integration, system parameter trcking control, and system performance optimization for open-cathode and closed-cathode PEMFC systems. For open-cathode PEMFC system, the stack temperature is the key factor sffecting the output performance of the system. In order to improve the dynamic temperature tracking performance under load changing conditions, adaptive inverse control and grey prediction based model free adaptive control is proposed for optimal temperature control of system. Further, in order to enhance the system efficiency of system, a maximum efficiency control strategy based on maximum efficiency optimization and constraint generalized predictive control is proposed in this thesis. For closed-cathode PEMFC system, considering the existed nonlinearity and strong coupling between operating parameters such as stack temperature and oxygen excess ratio (OER), a dual loop multivariable control strategy based on MIMO model free adaptive sliding mode control is proposed for stack temperature and air flow rate regulation of closed-cathode PEMFC system. Moreover, a 300 W open-cathode PEMFC system test bench and a 5-kW closed-cathode PEMFC system tests bench are established. All the control strategies and the performance optimization strategies are verified on the established test bench of open-cathode and closed-cathode PEMFC systems
Rosich, Oliva Albert. „Sensor placement for fault diagnosis based on structural models: application to a fuel cell stak system“. Doctoral thesis, Universitat Politècnica de Catalunya, 2011. http://hdl.handle.net/10803/53635.
Der volle Inhalt der QuelleEl present treball té per objectiu incrementar les prestacions dels diagnosticadors mitjançant la localització de sensors en el procés. D'aquesta manera, instal·lant els sensors apropiats s'obtenen millors diagnosticador i més facilitats d'implementació. El treball està basat en models estructurals i contempla una sèrie de simplificacions per tal de entrar-se només en la problemàtica de la localització de sensors. S'utilitzen diversos enfocs per tal de resoldre la localització de sensors, tot ells tenen com objectiu trobar la configuració òptima de sensors. Les tècniques de localització de sensors són aplicades a un sistema basat en una pila de combustible. El model d'aquest sistema està format per equacions no lineals. A més, hi ha la possibilitat d'instal·lar fins a 30 sensors per tal de millorar la diagnosis del sistema. Degut a aquestes característiques del sistema i del model, els resultats obtinguts mitjançant aquest cas d'estudi reafirmen l'aplicabilitat dels mètodes proposats.
SENNA, ROQUE M. de. „Desenvolvimento e demonstração de funcionamento de um sistema híbrido de geração de energia elétrica, com tecnologia nacional, composto por módulo de células a combustível tipo PEMFC e acumulador chumbo ácido“. reponame:Repositório Institucional do IPEN, 2012. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10121.
Der volle Inhalt der QuelleMade available in DSpace on 2014-10-09T13:59:32Z (GMT). No. of bitstreams: 0
Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
Payman, Alireza. „Contribution à la gestion d'énergie dans les systèmes hybrides multi-sources multi-charges“. Thesis, Vandoeuvre-les-Nancy, INPL, 2009. http://www.theses.fr/2009INPL038N/document.
Der volle Inhalt der QuelleThis work deals with a nonlinear control strategy of an electrical hybrid system which is composed of a fuel cell as the main source and a supercapacitor bank as the auxiliary source. Any algorithm commutation is not used in the proposed control strategy whereas the system works in different operating modes. After a review of various structures of the electrical hybrid systems and different control methods of these systems, two new approaches are developed. The first one is flatness-based method to ensure the energy management in the proposed hybrid systems and generally in a multi source / multi loads system. The proposed strategy is based on generation of a reduced-order model of the system. The energy management is carried out through the reference trajectories of the stored electrostatic energy of the system. The effect of the proposed control method on design of the system components (inductors and capacitors) is explained. In the second approach, the total energy stored in the choppers is taken into account to control the load converters of a multi-source/multi load system by use of the input/output linearization method. A nonlinear observer is proposed to estimate the variation of voltage-power output characteristic of the fuel cell which leads to an optimal performance of the hybrid system. The simulation and experimental results prove validity of the proposed control strategy
Payman, Alireza. „Contribution à la gestion d'énergie dans les systèmes hybrides multi-sources multi-charges“. Electronic Thesis or Diss., Vandoeuvre-les-Nancy, INPL, 2009. http://www.theses.fr/2009INPL038N.
Der volle Inhalt der QuelleThis work deals with a nonlinear control strategy of an electrical hybrid system which is composed of a fuel cell as the main source and a supercapacitor bank as the auxiliary source. Any algorithm commutation is not used in the proposed control strategy whereas the system works in different operating modes. After a review of various structures of the electrical hybrid systems and different control methods of these systems, two new approaches are developed. The first one is flatness-based method to ensure the energy management in the proposed hybrid systems and generally in a multi source / multi loads system. The proposed strategy is based on generation of a reduced-order model of the system. The energy management is carried out through the reference trajectories of the stored electrostatic energy of the system. The effect of the proposed control method on design of the system components (inductors and capacitors) is explained. In the second approach, the total energy stored in the choppers is taken into account to control the load converters of a multi-source/multi load system by use of the input/output linearization method. A nonlinear observer is proposed to estimate the variation of voltage-power output characteristic of the fuel cell which leads to an optimal performance of the hybrid system. The simulation and experimental results prove validity of the proposed control strategy
Robin, Christophe. „Développement d'un modèle prédictif de durée de vie d'une pile PEMFC pour une application aéronautique : étude des interactions entre le cœur de pile et les conditions d'opération du système“. Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAI057/document.
Der volle Inhalt der QuelleIn a global context of greenhouse gases emissions reduction, solutions need to be found to limit the pollution from transportation. In the aeronautics, the energy efficiency of planes can be improved by using alternative energy sources, such as fuel cells. This technology is an electrochemical device that converts hydrogen into electricity, water and heat. Nevertheless, cost and lifetime of fuel cells are weaknesses of this technology and need to be improved.As part of the use onboard commercial airplanes, analysis of a PEM fuel cell system durability is conducted, in collaboration with Zodiac Aerospace. Taking the fuel cell aging into account in the fuel cell system management is essential to limit the impact of inappropriate fuel cell core local conditions, which decrease the fuel cell lifetime. In this work, a complete study is proposed to correlate the fuel cell internal aging mechanisms (membrane degradation, catalyst dissolution) to the fuel cell local conditions which are defined partly by the system ancillaries’ performances, the power profile and the system environmental conditions. The objective is to be able to predict the fuel cell operation and its durability in order to suggest optimization strategies for the targeted application. The proposed approach is based on modeling and validated by experimental durability tests.A multi-physical model existing at the CEA is developed in this PhD to correlate the uses to the degradation mechanisms. The physical description of the fuel cell is done in this model, where electrochemical reactions, fuel cell water and gas diffusion mechanisms at micro scale and heat transfers are taken into account. Improvements are added, in order to better model the geometry of the gases distributing plates used in the tests. Besides, a work on the cooling circuit enables to refine the temperature distribution at the cell surface. Finally, degradation mechanisms are added to model the fuel cell aging. Two different approaches are used, one based on physical electrochemical equations (“Bottom-Up”) and the other one based on semi-empirical laws (“Top-Down”).Results from the modeling part are compared with dedicated tests. In particular, two tests of 2,000 hours each in aeronautical conditions are performed, with two different operating modes (stabilized and dynamic). Usual methods of electrochemical characterization (impedance spectroscopy, voltammetries), post-mortem analyses along with in-situ measurements of the current density and temperature performed during the tests help validating the model.In particular, the measures show that the developed model is able to simulate the heterogeneous distribution of the local conditions inside the fuel cell in function of the operating conditions (dry, wet, etc.). It gives the possibility to monitor the behavior of fuel cell internal parameters which are not reachable by the tests (relative humidity, molar fractions, etc.). Moreover, the model enables to find back the impact of several operating regimes on the aging, giving as well information about the degradation mechanisms acting on the materials. Last but not least, strategies are proposed to improve the fuel cell durability, based on the real cycle considered by Zodiac Aerospace for the use of the fuel cell system onboard a commercial airplane (apart from the propulsion)
Agbli, Kréhi Serge. „Modélisation multiphysique des flux énergétiques d’un couplage photovoltaïque-électrolyseur PEM-pile à combustible PEM en vue d’une application stationnaire“. Thesis, Besançon, 2012. http://www.theses.fr/2012BESA2001/document.
Der volle Inhalt der QuelleA stand alone multi-source system based on the coupling of photovoltaic energy and both a PEM electrolyser and a PEMFC for stationary application is studied. The system gathers photovoltaic array as main energy source, ultracapacitors and batteries packs in order to smooth respectively fast and medium dynamic by supplying the load or by absorbing photovoltaic source overproduction. Because of the necessity of fuel availability, especially for islanding application like this one, a PEM electrolyser is integrated to the system for in situ hydrogen production.The main purpose being modeling and management of the power flows in order to meet the energy requirement without power cut, a graphical modeling tool namely Energetic Macroscopic Representation (EMR) is used because of its analysis and control strengths. Thanks to the modular feature of the EMR, the different models of each energetic entity of the system are performed before their assembling.By using scale effect, the energetic system sizing is performed according to a household power profile. Then, by the help of the multi-level representation, the maximal control structure (MCS) is deduced from the system EMR model. The electrical reference values of the MCS are generated by applying the power balancing method involving the own dynamic of each source into the energy management strategy. Different behavior modes are taken into account. By considering an irradiance profile for one day, the system is simulated highlighting its suitable behaviour. Moreover, the relevance of the introduced coupling between fuzzy logic controller and the power balancing method is pointed out
Rodosik, Sandrine. „Etude de l'impact d'architectures fluidiques innovantes sur la gestion, la performance et la durabilité de systèmes de pile à combustible PEMFC pour les transports“. Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAI090.
Der volle Inhalt der QuelleAlthough hydrogen is booming, fuel cell electric vehicles are still rare on the market. Their high volume and complexity are still major hurdles to the development of PEM (Proton Exchange Membrane) systems for transport applications. This PhD. work aimed at studying two new fluidic circuits that can both simplify and reduce the system volume. Namely, the cathodic recirculation, and the Ping-Pong, which is a new fluidic architecture that alternate the fuel feed locations during operation. The performances of both architectures have been studied experimentally in automotive conditions on a 5 kW system. A multiscale analysis was conducted to compare, with other known architectures, the performances of the system, the stack and the homogeneity of the cell voltages inside the stack. The study was completed with a Ping-Pong durability test to evaluate the impact of this new operation on the fuel cell stack. The experimental data have been analyzed at different scales up to the post-mortem expertise of membrane-electrode assemblies
Lee, Shu-Feng, und 李書鋒. „Multi-scale Simulation and Design of an Intermediate Temperature Micro Solid Oxide Fuel Cell Stack System“. Thesis, 2009. http://ndltd.ncl.edu.tw/handle/38644748094953947416.
Der volle Inhalt der Quelle國立清華大學
動力機械工程學系
97
本論文以多尺度模擬設計中低溫平板型微固態氧化物燃料電池堆系統,結合分子動態模擬(Molecular dynamics)與計算流體力學(Computational fluid dynamics)。分子動態模擬用來求出固態氧化物燃料電池電解質的最佳摻雜濃度,而且此固態電解質能夠在中低溫操作下仍具有良好離子傳導性能。本論文針對中低溫型固態電解質氧化釤-鈰固態電解質(samarium-doped ceria)與氧化釓-鈰固態電解質(gadolinium-doped ceria)比較傳統型釔安定化氧化鋯(yittria-stablized zirconia)固態電解質在中低溫下的性能表現。透過分子動態模擬探討摻雜濃度與操作溫度對於固態電解質中離子傳導率的影響,以及利用計算流體力學合併電化學反應方程式研究中低溫平板型微固態氧化物燃料電池堆性能。 利用分子動態模擬,可以觀察氧離子在電解質內的傳遞現象,係藉由氧空洞的位置進行不連續性的動態傳遞,從分子動態模擬結果中得知,釤-鈰固態電解質與氧化釓-鈰固態電解質存在一最佳摻雜濃度。受到溫度影響,固態電解質內離子遷移性在較高溫時其傳導率越佳。最後,比對實驗結果證明分子動態模擬結果與實驗數據具有良好的匹配性。 利用多尺度模擬,進行中低溫平板型微固態氧化物燃料電池堆性能研究,由計算流體力學合併電化學反應方程式針對不同固態電解質與進氣岐管設計進行電池性能差異研究。在873K中低溫平板型微固態氧化物燃料電池堆系統使用氧化釤-鈰固態電解質能獲得較高的性能,相較於傳統型釔安定化氧化鋯固態電解質在中低溫操作環境下電池性能表現較差。為了改善中低溫平板型微固態氧化物燃料電池堆系統性能,利用新設計的進氣岐管來改善氣體利用率,由電池性能模擬結果顯示,此新型進氣岐管設計確實能夠獲得較高的電池性能。
Kang, Zhe-Wei, und 康哲維. „Study of a Multi-Phase Isolated DC/DC Converter for PEM Fuel Cell Stacks“. Thesis, 2010. http://ndltd.ncl.edu.tw/handle/33731010025977904061.
Der volle Inhalt der Quelle國立臺灣科技大學
電子工程系
98
Recently, clean energy resources, such as wind turbines, photovoltaic systems or fuel cells, have been exploited for developing renewable electric power generation systems. Among them, the rapid advances in fuel cell technology have enabled the significant developments in fuel cell power system. The fuel cells feature numerous advantages, such as high energy density, high current output ability, and high-efficiency operation. However, the fuel cell stacks present a low voltage output and a wide range of voltage variations under different load, temperature, humidity and electrochemical reaction conditions. A step-up power converter is therefore applied to obtain a high output voltage from the fuel cell system. A high-performance isolated multi-phase power converter for fuel cell power systems is studied and implemented. A digital controller is also designed to perform the interleaved operation of the paralleled multi-phase power modules. Finally, a 10-kW converter prototype is implemented and tested to verify the feasibility of the studied topology and control strategy.
Du, Toit Johannes Paulus. „Design and development of a 100 W Proton exchange membrane fuel cell uninterruptible power supply“. Thesis, 2006. http://hdl.handle.net/10352/286.
Der volle Inhalt der QuelleThis study presents the design of a proton exchange membrane fuel cell stack that can be used to replace conventional sources of electrical energy in an uninterruptible power supply system, specifically for use in the telecommunications industry. One of the major concerns regarding the widespread commercialization of fuel cells is the high cost associated with fuel cell components and their manufacturing. A fuel cell design is presented in which existing, low-cost, technologies are used in the manufacture of cell components. For example, printed circuit boards are used in the manufacturing of bipolar flow plates to significantly reduce the cost of fuel cells. The first objective was to design, construct and test a single fuel cell and small fuel cell stack in order to evaluate the use of printed circuit boards in bipolar plate manufacturing. Since the use of copper in a fuel cell environment was found to reduce the lifetime of the cells, the bipolar plates were coated with a protective layer of nickel and chrome. These coatings proved to increase the lifetime of the cells significantly. Power outputs of more than 4 W per cell were achieved. The second objective was to analyze a small fuel cell stack in order to obtain a model for predicting the performance of larger stacks. A mathematical model was developed which was then used to design an electronic circuit equivalent of a fuel cell stack. Both models were adapted to predict the performance of a fuel cell stack containing any number of cells. The models were proven to be able to accurately predict the performance of a fuel cell stack by comparing simulated results with practical performance data. Finally, the circuit equivalent of a fuel cell stack was used to evaluate the capability of a switch mode boost converter to maintain a constant voltage when driven by a fuel cell stack, even under varying load conditions. Simulation results showed the ability of the boost converter to maintain a constant output voltage. The use of supercapacitors as a replacement for batteries as a secondary energy source was also evaluated.
Yu, Ching-Chou, und 余景州. „Application of Digital Signal Processor Based Multi-Leg DC-DC Power Converter to Fuel-Cell Power Supply System“. Thesis, 2006. http://ndltd.ncl.edu.tw/handle/q6aw5b.
Der volle Inhalt der Quelle國立臺灣科技大學
電機工程系
94
This thesis focuses on the design and implementation of a digital signal processor based multi-leg dc-dc power converter for fuel-cell power supply systems. A multi-leg boost converter is designed in this system to reduce the output current ripple and increase the life time of fuel-cell. According to input and output voltage feedback and current feedback controls, the multi-leg power converter can not only balance the current of each leg, but also provide a steady output voltage to load. Besides, a bi-directional dc-dc power converter is used in this system to charge or discharge the batteries and balance the system power. The redundant power of fuel-cell can be stored in batteries by the power control between fuel-cell and batteries. Battery discharge will occur momentarily to meet the instant need of high system current and thereby raise the response speed when load changes. Fuel-cell can thus be operated in the average power point which fit in with the load. In this thesis, the mathematical models and controller of multi-leg dc-dc power converter are built and used for digital control. Then, a high-performance, low-cost digital signal processor (DSP, TMS320F2812) is used as the control core. The control of power converter and the method of power balance control are accomplished by software so as to reduce the cost. A prototype of 1kW multi-leg dc-dc power converter for fuel-cell is developed. The input voltage range is between 26V and 40V. The output voltage is 40V. Moreover, the experimental data show that the efficiency of the system reaches 93%, and the input current ripple of fuel-cell is less than 5%. Simulation and experimental results are given to justify the analysis.