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 19 of 19 for “"efficiency optimization"”.
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High speed linear induction motor efficiency optimization
… motor make it unique, and a means of optimizing efficiency with both the motor geometry and the motor control scheme will be analyzed to create a High-Speed Linear Induction Motor (LIM) with a higher efficiency than what is possible with conventional motors and controls. This thesis pursues the …
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Digital Control for Dynamic Efficiency Optimization in Switching Regulators
Dynamic efficiency optimization leverages opportunities to minimize power loss and adaptively optimize switching regulator efficiency as the operating conditions change. This thesis details the development of an optimization system that dynamically optimizes the efficiency of a targeted converter. …
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Production System Efficiency Optimization Using Hybrid AI Solution and Sensor Data
Achieving operational excellence and efficiency is a constant goal in manufacturing and production, driven by the need to reduce waste and optimize processes in today’s competitive environment. The era of Industry 4.0 offers advanced technologies such as Artificial Intelligence (AI), robotics, IoT …
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High Efficiency Optimization of LLC Resonant Converter for Wide Load Range
… of telecom and computing equipment. High efficiency and high power density are still the key technology drivers for power management for these applications. In order to save energy, in 2005, the U.S. Environmental Protection Agency (EPA) announced the first draft of its proposed revision …
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Spectral efficiency optimization with channel state information of a massive MIMO System
… can be formulated as nonconvex non-smooth optimization problems. Often there is lack of effective algorithms for these problems especially in the event that the optimization variables are non-linear and coupled in some nonconvex constraints. To add on to that it is close to impossible to …
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Dynamic Modeling and Model-Free Real-Time Optimization for Cold Climate Heat Pump Systems
… building and industrial applications, while its efficiency and heating capacity can be severely limited when operated in cold climate. Various modifications have been proposed for cold-climate operation of ASHP over the single-stage refrigeration cycle, such as vapor injection techniques and …
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A High-Efficiency Hybrid Resonant Microconverter for Photovoltaic Generation Systems
… of this dissertation is to develop a high-efficiency, low cost microconverter in an effort to increase the output power capability and decrease the cost of modular power conditioning systems. First, existing isolated dc-dc converter topologies are explored and a new topology is proposed …
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Modular Photovoltaic (PV) Step-up Converter With A Coupled Power Balancing Scheme for DC-Distributed System
… In the final part of this dissertation, a power efficiency optimization control scheme is proposed to allow the devised modular PV converter system to achieve high efficiency over a wide range of PV irradiation level. The feasibility of the devised modular PV converter and control concepts are …
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Multiport Energy Router based Integration of Renewable Energy Sources for Offshore Grid
… system's power density, reliability, and efficiency. The TAB modules in MER have an inherent capability of reaching zero voltage source (ZVS) switching due to the port inductor or leakage inductor transformer. This feature assists in eliminating the turn-on losses along with the EMI …
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Deep learning for energy-efficient wireless communications and spectrum management.
… methods are expert at solving sophisticated optimization problems. The key advantages of Deep Learning are the efficient learning of an enormous amount of data and the precise analysis for the hidden distribution. Therefore, Deep Learning methods can be used to solve complicated but useful …
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Zero-voltage switched resonant and PWM converters: design-oriented analysis and performance evaluation
… implementation of the converters in terms of efficiency. Efficiency optimization requires minimizing the circulating currents which are directly proportional to the reactive energy required by the resonant tank. The comparison of the different converters is based on the reactive energy …
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Quantitative Carrier Transport in Quantum Dot Photovoltaic Solar Cells from Novel Photocarrier Radiometry and Lock-in Carrierography
… solar cells. However, their power conversion efficiency is still insufficient for commercial applications, partly and significantly, due to the not-well-understood carrier transport mechanisms and the lack of effective characterization techniques. Addressing these issues, carrier transport …
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Design of energy-efficient ultrasonic communication systems on steel pipes
… When designing a network of such links, energy efficiency, defined as the average energy per transmitted bit, can be far more important than Shannon capacity, for such battery-powered, relatively inaccessible links. This work focuses on the low-rate, total life-time energy-limited regime to …
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Optimizing energy conversion efficiency of a proton exchange membrane green hydrogen generation system while incorporating balance of plant modeling
… system for the highest energy conversion efficiency across the range of possible operating conditions with renewable energy input. This work is focused on creating a system model of a PEM green hydrogen generation system including the balance of plant components such as power electronics, …
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Unified Control for the Permanent Magnet Generator and Rectifier System
… like aircraft and vehicles, power density and efficiency is critical. Since the generator and the rectifier can be controlled simultaneously, it would be very desirable to develop a unified control. With this unified control, the boost inductors between the PMG and rectifier is eliminated, …
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Generation, recombination and extraction of charges in polymer
A dramatic efficiency improvement of bulk heterojunction solar cells based on electron-donating conjugated polymers in combination with soluble fullerene derivatives has been achieved over the past years. Certified and reported power conversion efficiencies now reach over 9% for single junctions …
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Design, integration schemes, and optimization of conventional and pressurized oxy-coal power generation processes
… major challenge for today's world. Multivariable optimization is shown to be essential in unveiling the true potential and the high efficiency of pressurized oxy-coal combustion with carbon capture and sequestration for a zero emissions power plant (Zebian and Mitsos 2011). Besides the increase in …
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Energy, exergy and exergoeconomic analyses of gas-turbine based systems
… is achieved. The parametric study and plant optimization are performed to investigate the effects of the variation of specific input parameters such as fuel mass flow rate, air volume flow rate and compressor inlet air temperature, on the overall operating efficiency of the system. Through …
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Βέλτιστος σχεδιασμός του αντιστροφέα ρεύματος Flyback για εφαρμογή του σε φωτοβολταϊκά πλαίσια εναλλασσόμενου ρεύματος
Η παρούσα διδακτορική διατριβή αναφέρεται σε οικιακά Φ/Β συστήματα συνδεδεμένα στο δίκτυο χαμηλής τάσης, τα οποία αξιοποιούν την τεχνολογία των Φ/Β Πλαισίων Εναλλασσομένου Ρεύματος (Φ/Β Πλαίσια Ε.Ρ. – AC-PV Modules). Πρόκειται για Φ/Β διατάξεις μικρής ισχύος (έως 300W), οι οποίες δημιουργούνται από …