Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"dc/ac converter"”.
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Analysis and design of power electronic cell for modular power electronic systems: DC-AC converter configurations
… a basic power electronic cell and its different DC-AC configuration. It presents a solution for synchronization and circulating current problem for parallel connected cells. It extends this idea to full bridge and three phase configuration.
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Power Density Optimization of SiC-based DC/AC Converter for High-Speed Electric Machine in More/All-electric Aircraft
… or all electric aircraft urgently necessitates dc/ac converter systems with high power density. Silicon Carbide (SiC) devices, known for their superior performance over traditional silicon-based devices, facilitate this increase in power density. Nonetheless, achieving optimal power density …
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Observer-based fault detection and isolation for motor drive inverters
Abstract Observer-based methods can be used for fault detection and isolation for switched linear systems. A state observer is constructed based on the physical system. Changes in the observer error are monitored to detect specific types of faults. This thesis uses the mathematical basis to offer a …
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Single stage boost inverter for standalone fuel cell applications
… is a promising technology that can be manufactured in South Africa because of the platinum catalyst required. South Africa is rich in platinum and, therefore, the PEMFC system can be cost-effectively produced. In residential stationary applications of the PEMFC a power conditioning system is …
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Soft-switching techniques for high-power PWM converters
… of the power semiconductor devices in a power converter. This work presents several soft-switching topologies for high power PWM converters. These new topologies achieve soft-switching functions with minimum increase of device voltage/current stresses and converter circulating energy, and thus …
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Optimal vertical plane booster guidance including pitch dynamics
… of the power semiconductor devices in a power converter. This work presents several soft-switching topologies for high power PWM converters. These new topologies achieve soft-switching functions with minimum increase of device voltage/current stresses and converter circulating energy, and thus …
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Harmonic elimination by switching angle optimization technique for multilevel inverter
… to be a sinusoidal wave to obtain ideal AC output voltage waveform from the CHBMLI. By tuning the PI controller as well as the self-learning abilities of the ANN controller, switching signals towards the CHBMLI can be improved. This project is to provide a model of the multilevel inverter …
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Overcoming electro-thermal barriers to achieve extreme performance power conversion for more electric aircraft
The National Aeronautics and Space Administration (NASA), in addition to an increasing number of privately funded ventures, has demonstrated growing interest in more electric aircraft (MEA) - flight vehicles where propulsion is partially or totally supplied by electric motors. While hybrid or …
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Toward high-efficiency high power density single-phase DC-AC and AC-DC power conversion - architecture, topology and control
Power conversion between the single-phase AC grid and DC sources or loads plays an indispensable role in modern electrical energy system for both generation and consumption. The renewable resources and electrical energy storage are integrated to the grid through inverters. Telecoms, data centers …
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Investigation of Control Concepts for High-Speed Induction Machine Drives and Grid Side Pulse-Width Modulation Voltage Source Converters
Control of a low voltage ac/dc/ac converter for high-speed induction machine drive applications has been investigated. Such a configuration can be applied, for example, in microturbines and high-speed spindles. Scalar control is usually applied for the control of high-speed drives especially in the …
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Modeling, analysis, simulation and real-time hardware in-the-loop implementation of hybrid/electric vehicles’ powertrain
… particular emphasis on transient modeling. To achieve that, a novel complete simulation model on PSIM platform has been performed; proved worthy on two commercially existing cars in the market, namely Chevy Volt and Nissan Leaf. This was done using real data obtained from the Oak Ridge National …
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Resonant power conversion topologies for inductive charging of electrical vehicle batteries
… power form the 50/60 Hz utility feeds a dc-ac converter which delivers high-frequency ac power to the electric vehicle inductive coupling inlet. The inlet configuration has been defined by the Society of Automotive Engineers in Recommended Practice J-1773. This thesis studies converter …
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The Modeling and Advanced Controller Design of Wind, PV and Battery Inverters
… equipments are commonly employed to interface the renewable energy generation with the grid. The intermittent nature of renewable and the large scale utilization of power electronic devices bring forth numerous challenges to system operation and design. Methods for studying and improving …
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Space Vector Modulation and Control of Multilevel Converters
… system that can match slowly varying dc voltage and dc current on the super conductive magnet side with the ac voltages and ac currents on the utility side. At the same time the power conditioning system was required to provide a bi-directional power flow to the superconductive magnet. …
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Design and Analysis of a Single-Stage Inverter Using Parallel DC-DC Converters for Solar Cell Application
… the possibility of using boost and buck-boost converters to provide an AC output. The proposed circuit utilizes non-synchronous boost and buck-boost converters due to their simplicity in control signals as opposed to synchronous converters. The application of the proposed inverter is for use …
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Form-Factor-Constrained, High Power Density, Extreme Efficiency and Modular Power Converters
Enhancing performance of power electronics converters has always been an interesting topic in the power electronics community. Over the years, researchers and engineers are developing new high performance component, novel converter topologies, smart control methods and optimal design procedures to …
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Βέλτιστος σχεδιασμός του αντιστροφέα ρεύματος Flyback για εφαρμογή του σε φωτοβολταϊκά πλαίσια εναλλασσόμενου ρεύματος
… Εναλλασσομένου Ρεύματος (Φ/Β Πλαίσια Ε.Ρ. – AC-PV Modules). Πρόκειται για Φ/Β διατάξεις μικρής ισχύος (έως 300W), οι οποίες δημιουργούνται από την ενσωμάτωση ενός μόνο Φ/Β πλαισίου και ενός μετατροπέα (ενός η πολλών σταδίων) συνεχούς τάσης σε μονοφασική εναλλασσόμενη τάση, σε μια αυτοτελή …