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 95 for “"medium-voltage"”.
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Medium voltage extreme fast charger based on novel medium voltage SiC power devices
… SiC Austin SuperMOS devices are used as the medium voltage power electronic switches and soft-switching over the entire range of grid voltage has been ensured by a novel variable switching frequency double phase shift modulation technique. Experimental results validate the simulation results …
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Investigating Impact of Emerging Medium-Voltage SiC MOSFETs on Medium-Voltage High-Power Applications
… approached their limits of operation in blocking voltage, working temperature and switching frequency. Due to material superiority, the relatively-new wide-bandgap semiconductors such as Silicon-Carbide (SiC) MOSFETs enable higher voltages, switching frequencies and operating temperatures when …
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Equivalent Modeling of Medium-Voltage Gate Drive Circuitry
… the gate-to-drain capacitor, causing disturbance voltages across the gate-to-source nodes. The gate-to-source voltage controls whether the device turns on or off, and the disturbance voltages can be severe enough to cause shoot through or even cause the device to fail. Additionally, the more …
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Improving the reliability performance of medium voltage networks
… ways of improving the reliability performance of medium voltage networks. Customers are mainly affected by faults on the distribution MV network, to which, consequently, we have to pay particular attention. A major requirement on electricity supply systems is high supply reliability for the …
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On the Compensation of Medium Voltage Metrology via Alternative Methods
… technology have led to the development of medium-voltage (MV) SiC MOSFETs that feature fast switching speeds at high power levels. Significant efforts have been applied to characterizing these devices, but recent studies have revealed that currently available medium-voltage metrology is …
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Medium voltage petrochemical drives : soft start and adjustable speed systems
Medium voltage synchronous machines are used for large petrochemical compressor motor drives (>13 MW) at high application voltages (e.g. +-11 kV). Limited research exists on the application of Voltage Source Inverters (VSIs) for these petrochemical loads. An application concept is described where …
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Electromagnetic Interference and Compatibility within SiC-based Medium Voltage Converters
… to their fast switching capability. Meanwhile, medium voltage (MV) high power converters have been pushed to higher power, higher voltage, and higher power density design requirements in recent years, which makes the EMI management even more difficult. Unlike converter-level noise emissions …
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High-frequency Power Conversion for Medium Voltage Power Electronics Interfaces
… for efficient energy conversion, the field of medium voltage power conversion has experienced significant progress in recent years. This progress is driven by its high efficiency and improved scalability. Medium voltage power conversion finds applications in various areas such as data centers, …
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The optimal placement of switching devices on rural medium-voltage systems
Electricity is supplied to rural areas by radial networks operating for example at 11 or 22 kV. A problem with radial networks is that faults on the feeders result in the loss of electricity supply to all customers if they are not sectionalised. Some radial networks emanating from one feeder from …
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Online Partial Discharge Detection and Localization of Medium-voltage Overhead Distribution Networks
L'abstract è presente nell'allegato / the abstract is in the attachment
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Load models for technical, economic and tariff analysis of medium voltage feeders
… role in many studies, including calculating voltage drops and technical losses in distribution systems, for distributed generator (DG) integration planning, and in tariff analysis and design models. The Herman-Beta transform used in the low voltage network modelling studies in South Africa is …
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Protection, Control, and Auxiliary Power of Medium-Voltage High-Frequency SiC Devices
… and higher power density. With higher blocking voltage available, WBG devices, especially the silicon carbide (SiC) metal-oxide-semiconductor field-effect transistor (MOSFET), have been widely explored in various medium-voltage (MV) applications in both industry and academia. However, due to the …
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Novel Multilevel Converter for Variable-Speed Medium Voltage Switched Reluctance Motor Drives
… reluctance motor drives operating at the medium voltage level is presented. The drive is capable of variable speed, four-quadrant operation. Each phase leg of the converter contains an arbitrary number of cascaded cells connected in series with the phase winding. Each cell contains a …
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On the Design of a High-Power Medium-Voltage Converter for Transportation Applications
… ampacity requirements, is of intense interest. Medium-voltage dc systems provide significant improvements to power density compared to ac systems, and wide-bandgap devices enable operation at sufficiently high switching frequencies to make medium-voltage dc systems attractive. On the other hand, …
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Insulation Design and Analysis for Medium-Voltage SiC-based Power Electronics Building Blocks
In this dissertation, a design approach for medium voltage (MV) PCB-based components, such as the dc bus, is detailed. Key considerations, including electric field (E-field) grading near power terminals and PCB edges, cable feedthroughs, and the integration of components, are explored from the …
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High Frequency Isolated Power Conversion from Medium Voltage AC to Low Voltage DC
… of CLLC converter is also given in the end. Medium voltage high frequency transformer is the key element in terms of insulation safety, power density and efficiency. Firstly, two mostly used transformer structures are compared. Then transformer insulation requirement is referred for 4160 V …
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2-D Coaxial Integration of Medium Voltage Power Electronics Enabled by Field-Driven Design
… and energy storage, enable efficient high-voltage dc transmission, and facilitate distributed, bidirectional power flow control. Despite these technological advances, a significant bottleneck remains: the time required to deploy critical distribution infrastructure is on the order of years. …
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Field-Grading in Medium-Voltage Power Modules Using a Nonlinear Resistive Polymer Nanocomposite Coating
Medium-voltage silicon carbide power devices, due to their higher operational temperature, higher blocking voltage, and faster switching speed, promise transformative possibilities for power electronics in grid-tied applications, thereby fostering a more sustainable, resilient, and reliable …
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Design of a 405/430 kHz, 100 kW Transformer with Medium Voltage Insulation Sheets
… and components must be able to handle higher voltage and current ratings at higher percentages of efficiency while also maintaining low cost and a compact footprint. To meet such demands, medium-voltage resonant converters have been favored by researchers for their ability to operate at higher …
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Experimental Evaluation of Medium-Voltage Cascode Gallium Nitride (GaN) Devices for Bidirectional DC–DC Converters
… frequencies, output power levels, blocking voltages, and operating temperatures. However, tradeoffs in switching performance and converter efficiency when substituting GaN devices for Si and SiC counterparts are not well defined, especially in a cascode configuration. Additional research …
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