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The Global ETD Search service is a free service for researchers
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Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 1 to 9 of 9 (0.083 seconds)Spelling suggestions: "subject:"acharge ercontroller"" "subject:"acharge felkontroller""
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Solar Powered Smart Street PostElSherif, Khaled January 2018 (has links)
This thesis work aimed to develop solar Photovoltaic (PV) powered smart street post. The post was set to serve on highways for wild animals’ detection and warn vehicles of possible crossings. The main aim was to design reliable standalone PV system via PVSyst software and experimenting four different PV technologies including a bifacial module under. Another aim was to select and develop the hardware and software terms of the smart street pot. Radar sensor and analog to digital (A/D) data acquisition (DAQ) card were set to be used for the motion detection. RF wireless communication module was used for communicating with nearby posts to send data and trigger warning light emitting diodes (LED) sign. A Raspberry Pi microcontroller was programmed to control the operation of the street post through processing the signal from radar sensor and communicating with nearby posts. The PV system design included generation of street post’s daily profile, sizing and selection of the components of the system including the module, battery, charge controller and power stage circuit. The later was designed to provide suitable voltage level and interface for the loads connected. PVSyst model was built and set to be located in Ulm, Germany. The design parameters were set, and different set of orientations were tested for each module. The simulation results showed bifacial module delivered a reliable PV system in case of south and south-east orientation and achieved better performance in other orientations in comparison to the other PV modules implemented. Due to limitations in PVSyst software the results provided had an overall uncertainty of 5%. The microcontroller was able to process the data from the radar sensor and DAQ card and perform fast Fourier transform (FFT). However, further processing of motion detection was complex to be included in the thesis work. The radar sensor and DAQ card provided signals with uncertainty of ± 3.4 mV. The RF wireless communication module transmitted signal over various ranges up to 150 m with time delay of 500 ms.
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Conversor CC/CC com dois estÃgios para aplicaÃÃo em sistemas fotovoltaicos autÃnomos de energia / DC/DC converter with two stages for use in stand-alone photovoltaic power systemsFrancisco Everton Uchoa Reis 24 February 2012 (has links)
CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior / O presente trabalho apresenta o estudo de um conversor CC/CC com dois estÃgios para aplicaÃÃo no desenvolvimento de sistemas autÃnomos de energia elÃtrica. O conversor sob estudo consiste basicamente da associaÃÃo de dois conversores CC/CC, em que entre eles à inserido um banco de baterias para dar continuidade ao fornecimento de energia em
perÃodos em que nÃo hà radiaÃÃo solar. Todos os conversores utilizados para a composiÃÃo do sistema sÃo do tipo boost utilizando a cÃlula de comutaÃÃo de trÃs estados (CCTE). O
primeiro conversor tem a funÃÃo enviar energia desde os painÃis fotovoltaicos a um banco de
baterias de 48 V e permitir a operaÃÃo dos painÃis fotovoltaicos no ponto de mÃxima potÃncia
(MPP- Maximum Power Point). O segundo estÃgio à constituÃdo por um conversor de alto
ganho de tensÃo, cujo papel à elevar a tensÃo do banco de baterias de 48 V para uma tensÃo de
400 Vcc, formando assim o barramento de saÃda do sistema em tensÃo contÃnua. Para garantir
a regulaÃÃo da tensÃo em 400 Vcc, foi implementada a tÃcnica de controle LQR (Linear
Quadratic Regulator). Para o projeto do controle LQR Ã utilizado uma metodologia
simplificada para a obtenÃÃo de um modelo reduzido do conversor de alto ganho de tensÃo.
Para cada estÃgio à apresentado seu estudo teÃrico, anÃlise de perdas e dimensionamento dos
componentes para o atendimento das especificaÃÃes de projeto. Para verificar a anÃlise teÃrica
foi montado um protÃtipo para cada estÃgio e os resultados experimentais sÃo apresentados
neste trabalho. / This work presents a study of a DC/DC converter with two stages for implementation
of a stand-alone photovoltaic power system. The converter under study consists of two
DC/DC converters, in which between them is inserted a battery bank to give continuity to the
energy supply in periods when there isnât solar radiation. All converters used for the
composition of the system are of type boost based on the three-state switching cell (TSSC).
The first converter has function of to send energy from photovoltaic panels to a battery bank
of 48 V formed by four batteries of 12V connected in series, and its function is to allow the
photovoltaic panels operation at the maximum power point (MPP). The second stage consists
of a converter of high voltage gain, whose role is to raise the 48 V battery bank voltage to
400V DC output bus voltage. To ensure the regulation of voltage at 400 V DC, was
implemented the control LQR (Linear Quadratic Regulator). To design the controller LQR, a
simplified methodology to obtain a model of the high-gain voltage converter is used. For each
stage is presented its theoretical study, analysis and the components were designed and
specified. To verify the theoretical analysis, was developed a prototype for each stage and the
experimental results are presented in this work.
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Arduino Based Hybrid MPPT Controller for Wind and SolarAssaad, Michael 12 1900 (has links)
Renewable power systems are becoming more affordable and provide better options than fossil-fuel generation, for not only the environment, but a benefit of a reduced cost of operation. Methods to optimize charging batteries from renewable technologies is an important subject for off-grid and micro-grids, and is becoming more relevant for larger installations. Overcharging or undercharging the battery can result in failure and reduction of battery life. The Arduino hybrid MPPT controller takes the advantage of solar and wind energy sources by controlling two systems simultaneously. The ability to manage two systems with one controller is better for an overall production of energy, cost, and manageability, at a minor expense of efficiency. The hybrid MPPT uses two synchronous buck DC-DC converters to control both wind and solar. The hybrid MPPT performed at a maximum of 93.6% efficiency, while the individual controller operated at a maximum 97.1% efficiency when working on the bench test. When designing the controller to manage power production from a larger generator, the inductor size was too large due to the frequency provided by the Arduino. A larger inductor means less allowable current to flow before the inductor becomes over saturated, reducing the efficiency of the controller. Utilizing a different microcontroller like the PIC16C63A produces a much faster frequency, which will reduce the inductor size needed and allow more current before over saturation.
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Návrh fotovoltaického systému rodinného domu / Design of photovoltaic system for a family houseDarebný, Tomáš January 2017 (has links)
Basic knowledge of photovoltaic energy transformation, devices and materials, used in photovoltaic are summarized in this master's thesis. The main goal of this thesis is orientation in the photovoltaic systems used these days and explain advantages and disadvantages of these systems during the design phase.
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Regulátor pro nabíjení olověných akumulátorů z fotovoltaického panelu / Charge controller for solar panel based charging of lead-acid batteriesKorenčiak, Peter January 2011 (has links)
Tato diplomová práce se zabývá návrhem a realizací regulátoru pro použití v solárním systému s větším počtem olověných akumulátorů. Takový regulátor umožňuje nezávislé připojení a řízení nabíjení většího počtu akumulátorů různého stáří a parametrů. To je v kontrastu s řešeními obsahujícími jedno připojení pro více baterií připojených paralelně, kde se míchání baterií různého druhu a stáří nedoporučuje. Tento regulátor nabízí vysokou škálovatelnost skladování energie v solárním systému. Umožňuje také používat starší baterie s novými, místo nutnosti staré baterie nahradit, když jejich kapacita klesne pod požadovanou úroveň. V této práci jsou podrobně popsány požadavky, návrh hardwaru a softwaru a implementace regulátoru s nominálním výstupním proudem 20A pro pět 12V olověných baterií. Práce popisuje také další funkce, stejně jako alternativní návrhy a algoritmy. Důležitá část práce se zabývá designem spínačů pro velké proudy, ochrany proti zkratu a obvodů pro měření stejnosměrného proudu. Správná funkčnost regulátoru byla ověřena měřením.
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Experimental Assessment of Photovoltaic Irrigation SystemRaza, Khalil 15 December 2014 (has links)
No description available.
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Fotovoltaické dobíjecí regulátory v ostrovních systémech / Solar charge controllers for off-grid systemsKRČKA, Pavel January 2013 (has links)
This diploma thesis deals with photovoltaic rechargable regulators used in isolated, or off-grid photovoltaic systems. First, basic types of off-grid installations, including their functions and applications in practice are described. Then, possibilities of electric energy accumulation in photovoltaic systems are mentioned, considering actual, accesible technologies. Matters of electric energy accumulation in leaden accumulators are examined in detail. Main part of the diploma thesis is about electronic designs of photovoltaic, also called solar, rechargable regulators. These are the main connecting part between photovoltaic panels, accumulator, but also often connected charge, which is appliance. Individual electronic regulators concepts are described narrowly, then compared and evaluated in thesis´ conclusion.
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Koncept nabíjecí stanice s možností off-grid provozu pro elektrokola / Concept of Charging Stations with off-grid Operation for Electric BicyclesLeitman, Valentín January 2017 (has links)
This thesis deals with charging stations for electric bicycles powered by renewable energy. The aim of this work is to make a proposal for the hybrid charging stations for electric bicycles, which will work independently and, if necessary, will be backed up by a network. In this thesis is entered theoretical information on the issue of electric bicycles, the batteries, charging stations, the connectors of chargers, and photovoltaic systems. The practical part of this thesis is the basic design of the charging station and its design of the mathematical model of the individual parts in Simulink program, which are linked to the actual design of the charging station. In conclusion, this thesis deals with energy and economic analysis of the proposed system, therein included various methods of assessing investment recommendations of appropriate processing methods and overall assessment of the subject.
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Development of a Cost-Effective, Reliable and Versatile Monitoring System for Solar Power Installations in Developing Countries : A Minor Field Study as a Master Thesis of the Master Programme in Engineering Physics, Electrical EngineeringTrella, Fredrik, Paakkonen, Nils January 2016 (has links)
This report is the result of a conducted Minor Field Study (MFS), to the greatestextent funded by the Swedish International Development Cooperation Agency(SIDA), in an attempt to design a system for evaluating smaller solar power systems indeveloping countries. The study was to the greater part conducted in Nairobi, Kenyain close collaboration with the University of Nairobi. The aim was to develop asystem that would use easily available components and keep the costs to a minimum,yet deliver adequate performance. The system would measure certain parameters of asolar power system and also relevant environmental data in order to evaluate theperformance of the system. Due to the specific competence of the collaboratinggroup at the University of Nairobi, a Kinetis Freescale K64-microcontroller with anARM-Cortex processor was selected as the core of the design. Components wereselected, schematics were drawn, a circuit board was designed and manufactured andsoftware was written. After 12 weeks a somewhat satisfying proof-of-concept wasreached at the end of the field study in Kenya. The project however proved howdifficult it is to go from first idea to a functional proof-of-concept during a limitedtimeframe, and also in an East-African country. The final proof-of-concept was testedat Mpala Research Centre in Kenya and despite containing some flaws proved that itwould indeed be possible to design a working system on the principles discussed inthis report. The system is open-source, so anyone may use and modify it.
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