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 20 of 21 for “"AC-AC"”.
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An AC-AC inverter for high frequency power distribution system
… require the power source to be high frequency ac type and be combined with line current Power Factor Correction that satisfies IEC 1000-3-2 standard. In addition, low power applications require high efficiency, high power density and cost effectiveness. This thesis provides a solution to low …
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Design, Modeling and Analysis of an AC-AC Dual Active Bridge Converter
… greater energy density have made the SST an attractive option. Among various power electronic converter topologies, the Dual Active Bridge (DAB) has become popular for its bidirectional power flow capability and galvanic isolation, primarily in the DC application space. Advancements in …
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Power electronic transformers for AC-AC and AC-DC conversion with reduced number of switches
… for three-phase power conversion (three-phase AC to AC as well as three-phase AC to DC). The goal of this project is to reduce the weight and size of the power converter by replacing the low-frequency transformers with high-frequency transformers (HFTs). The novelty of these proposed topologies …
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Development of control techniques for direct AC‐AC matrix converter fed multiphase multi‐motor drive system
… applications, such as paper mills, locomotive traction, oil and gas, mining and machine tools, which require high performance control of more than one electric motor simultaneously. When more than one electric motors are employed in an electric drive, it is called, ‘multi‐motor drive’. These …
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Soft-switched, active-clamped DC/AC and AC/AC converters for IPT-based wireless charging applications
The acquisition of inductive power transfer (IPT) technology in commercial electric vehicles (EVs) alleviates the inherent burdens of high cost, limited driving range, and long charging time. In EV wireless charging systems using IPT technology, power electronic converters play a vital role to …
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Modeling and Analysis of a Four-Switch Buck-Boost Dynamic Capacitor
<p>Modern electric power utilities are facing a variety of challenges introduced by the increasing complexity of their operation, structure, and consumer loads. One such challenge has been to supply the ever growing demand for reactive power which is essential for grid support. For this reason …
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Improvement in control and gain aspects of impedance source inverters and converters
… spectrum of electric power conversions from DC-AC (e.g. inverters), to phase and frequency conversion (AC-AC) in a wide range of applications. A wide variety of topologies and control methods using different impedance source networks have been presented in the literature to overcome the …
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Influence of surface chemistry of carbon materials on inorganic nitrogen contaminants chemisorption
… (NO2-), using carbon materials (CMs) such as activated carbon (AC), and biochar (BC) has been widely implemented. This study was based on the hypothesis that surface chemical properties of CMs significantly influence INC adsorption. A range of physicochemical characterizations of CMs was …
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Vereinfachte Methoden zur optimalen Regelung resonanter Leistungskonverter
… applications are growing rapidly, not only to achieve the highest efficiency but also to focus on the size and weight minimization which are playing a major role in this area. Therefore, the research trends in dc-dc, ac-dc, dc-ac, ac-ac topologies are still continuously developing into the …
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Ionic Liquids Tethered to Activated Carbon for Capture of Airborne Toxins
… (ILs) were investigated for functionalization of activated carbon (AC) adsorbents for the filtration of warfare toxins. Preliminary steps were taken by testing absorption capacity of neat ILs and tethering ionic liquids to the surface of AC. AC is known to have good adsorption ability for warfare …
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Design of High-Density Filter Building Blocks for SiC-based Three-Phase Power Converters
… size of passive components such as DC-link capacitors and line harmonic filters. Unfortunately, with faster switching speeds and high slew rates, the common-mode (CM) and differential-mode (DM) conducted emissions interference (EMI) noise is worsened. The effects are manifested at the utility …
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Analysis and Design for a High Power Density Three-Phase AC Converter Using SiC Devices
The development of high power density three-phase ac converter has been a hot topic in power electronics area due to the increasing needs in applications like electric vehicle, aircraft and aerospace, where light weight and/or low volume is usually a must. Many challenges exist due to the …
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Adenylyl Cyclase Type 9: Regulation and Cardiac Function
<p>Abnormalities in cardiac stress signaling underlie a number of cardiovascular diseases (e.g. arrhythmias and heart failure). Cardiac stress signaling pathways normally integrate signals from the sympathetic nervous system to promote efficient contraction and relaxation under stress. Sympathetic …
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Supporting the UK distribution networks with power electronic end user voltage regulation
… distribution networks. Studies found that the capacity of the network cannot support the predicted increase in demand due to current limits on the network. To increase the capacity of the network, raising the voltage level of the system was explored. Studies indicated that raising the voltage …
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Design of IPT Highways to Power Moving Electric Vehicles
Modern Electric Vehicles (EVs) are an attractive and sustainable transportation alter- native to help reduce global greenhouse gas emissions and our dependence on a rapidly diminishing petroleum reserve. However due to their limited battery capacity, most current EVs need to be manually plugged …
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Low Voltage Ride-Through for Indirect Matrix Converter Based Open-End Winding Drives
… ASDs serve a varied set of processes including HVACs, oilrigs and recently many electric vehicles (EV). The most commonly employed types are the DC-to-AC or AC-to-AC drives with DC/AC drives being more popular in storage and EV applications. AC/AC drives have been dominated by converters using …
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Circuits and Modulation Schemes to Achieve High Power-Density in SiC Grid-connected Converters
… material properties such as low-loss characteristics, high blocking voltage, and high junction temperature operation, they are expected to drastically increase the power density of power electronics systems. Recent state-of-the-art designs show the power density over 17 ; however, certain …
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Indirect Matrix Converter as Standard Power Electronic Interface
… and its importance in future energy systems have accelerated the interest of developing new power electronic interfaces for the energy conversion process. The feasibility of applying the indirect matrix converter as the standard power electronic interface for applications with power ratings from …
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Pulse Density Modulated Soft Switching Cycloconverter
Single stage cycloconverters generally incorporate hard switching at turn on and soft switching at turn off. This hard switching at turn on combined with the slow switching speeds of thyristors (the switch of choice for standard cycloconverters) limits their use to lower frequency applications. …
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