Blar i NTNU Open på forfatter "Undeland, Tore Marvin"
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Merits of SiC MOSFETs for high-frequency soft-switched converters,measurement verifications by both electrial and calorimetric methods
Tiwari, Subhadra; Langelid, John K.; Undeland, Tore Marvin; Midtgård, Ole-Morten (Journal article; Peer reviewed, 2019)This paper quantifies the soft switching loss of a 1.2 kV SiC MOSFET module via a calorimetric method in a 78 kW full-bridge resonant inverter switched at approximately 200 kHz. By switching the SiC MOSFET just before the ... -
Modelling and Control of High Performance Medium Voltage Drives: - Simulation and analysis of the Programmed Modulation strategy
Enes, Roger (Master thesis, 2012)In the master thesis the concept of Programmed Modulation is investigated for motor drives with Three-Level NPC inverter. Programmed Modulation operates with pre-calculated PWM switching-patterns, which enables the facility ... -
Modelling and quantification of power losses due to dynamic on-state resistance of GaN E-mode HEMT
Spro, Ole Christian; Peftitsis, Dimosthenis; Midtgård, Ole-Morten; Undeland, Tore Marvin (Chapter, 2017)This paper investigates a method for quantifying the additional losses in high-voltage GaN enhancement mode HEMTs (eHEMT) employed in converter applications. The additional losses stem from the phenomenon known as current ... -
Modular Stacked DC Power System for Offshore Electrification
Tomren, Martin (Master thesis, 2013)Modular Stacked DC (MSDC) is an electrical system architecture intended for use in offshore petroleum installations. The system is patented and announced by GE Oil and Gas, but has currently not been built for a full scale ... -
Multilevel Converters for a 10 MW, 100 kV Transformer-less Offshore Wind Generator System
Iversen, Tor Martin (Master thesis, 2012)The size of offshore wind generators is increasing, and the trend is moving towards full converter gear-less solutions with permanent magnet synchronous generators (PMSG). The nacelle weight reduction is a key design ... -
Multilevel Converters for Offshore Wind Systems: A Comparative Study
Taffese, Abel Assegid (Master thesis, 2014)- -
MultiPhase Permanent Magnet Synchronous Generators for Offshore Wind Enegy System: Control of six phase PMSG- six leg converter system
Ayehunie, Nahome Alemayehu (Master thesis, 2011)The three phase permanent magnet synchronous generator with full scale converter arrangement has gained significant market share in win energy turbine topology. This is because of the advancement in production of superior ... -
Offshore Power Transmission: Submarine high voltage transmission alternatives
Ulsund, Ragnar (Master thesis, 2009)Offshore power transmission is becoming an increasingly important issue. To moderate climate change, world leaders have set environmental goals that will be very difficult to reach without renewable power production and ... -
On Modern IGBT Modules: Characterization, Reliability and Failure Mechanisms
Xiao, Di (Master thesis, 2010)The increased demand of offshore power conversion systems is driven by newly initiated offshore projects for wind farms and oil production. Because of long distances to shore and inaccessibility of the equipment long repair ... -
Optimal Operation of a Stand-Alone Power Supply using Artificial Intelligence
Rui, Øyvind August (Master thesis, 2009)Artificial intelligence (AI) is a collective term for several computing techniques. They have in common that they use non-linear algorithms and that they are inspired from different processes in the nature, in particular ... -
Optimized Design of Multi-MHz Frequency Isolated Auxiliary Power Supply for Gate Drivers in Medium-Voltage Converters
Spro, Ole Christian; Lefranc, Pierre; Par, Sanghyeon; Rivas-Davila, Juan; Peftitsis, Dimosthenis; Midtgård, Ole-Morten; Undeland, Tore Marvin (Peer reviewed; Journal article, 2020)This article presents the design and optimization of a suitable topology for an isolated dc–dc auxiliary power supply with high isolation voltage and low coupling capacitance. The converter consists of a GaN HEMT inverter ... -
Parasitic capacitances and inductances hindering utilization of the fast switching potential of SiC power modules. Simulation model verified by experiment
Tiwari, Subhadra; Midtgård, Ole-Morten; Undeland, Tore Marvin; Lund, Richard (Chapter, 2017)This paper investigates the switching performances of two state-of-the-art half-bridge SiC MOSFET modules using a standard double pulse test methodology. A deliberate choice of the modules with the same voltage and current ... -
Power Cycle Testing of Press-Pack IGBT Chips
Frank, Øyvind Bjerke (Master thesis, 2014)In this thesis the power cycling capability of individual press-pack IGBT chips is investigated. Press-pack is a packaging technology used for power semiconductors. For press-packs, both thermal and electrical contact to ... -
Power Cycle Testing of Press-Pack IGBT Chips
Frank, Øyvind Bjerke (Master thesis, 2014)In this thesis the power cycling capability of individual press-pack IGBT chips is investigated. Press-pack is a packaging technology used for power semiconductors. For press-packs, both thermal and electrical contact to ... -
Pressure Tolerant Power Electronics
Holt, Øystein (Master thesis, 2009)The thermal behaviour of an IGBT module was investigated, especially with respect to the module being immersed in dielectric oil. An equivalent thermal model was built using thermal transients and network synthesis. The ... -
SiC Devices for Renewable and High Performance Power Conversion Applications
Abuishmais, Ibrahim Abed; Undeland, Tore Marvin (Journal article; Peer reviewed, 2012)The unique properties of SiC devices enable substantial improvement of existing power conversion systems. SiC devices offer lower conduction and switching losses which increases converter efficiency. With high switching ... -
SiC MOSFETs an Diodes: Characterization, Applications and Low-Inductive Converter Design Considerations
Tiwari, Subhadra (Doctoral theses at NTNU;2019:238, Doctoral thesis, 2019)The future power electronic system trends are: higher efficiency, higher power density, higher operating temperature and lower operation cost of power electronic converters. The emerging wide-bandgap (WBG) semiconductor ... -
SiC MOSFETs for future motor drive applications
Tiwari, Subhadra; Midtgård, Ole-Morten; Undeland, Tore Marvin (Chapter, 2016)This paper investigates the switching performance of six-pack SiC MOSFET and Si IGBT modules for motor drive applications. Both the modules have same packaging and voltage rating (1.2 kV). The three bridge legs of the ... -
SiC MOSFETs for Offshore Wind Applications
Tiwari, Subhadra; Undeland, Tore Marvin; Midtgård, Ole-Morten; Nilsen, Roy (Journal article; Peer reviewed, 2018)Space and weight are critical factors for offshore wind applications during the construction, operation, and maintenance phases. Superior material properties of silicon carbide enable the development of power devices capable ... -
Silicon Carbide Technologies for High Temperature Motor Drives
Snefjellå, Øyvind Holm (Master thesis, 2011)Many applications benefit from using converters which can operate at high temperatures among them; down-hole drilling, hybrid vehicles and space craft. The theoretical performance of transistors made of Silicon Carbide ...