Browsing NTNU Open by Author "Undeland, Tore Marvin"
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30 kW Power Boost System for Drive Trains for Electric Vehicles Based on Supercapacitor Technologies
Lium, Frode (Master thesis, 2007)The goal of the master thesis is to design, dimension and construct a power boost system for the drive trains in electric vehicles, utilizing supercapacitor technology. In order to build the system a supercapacitor bank ... -
A Modular Series Connected Converter for a 10 MW, 36 kV, Transformer-Less Offshore Wind Power Generator Drive
Gjerde, Sverre Skalleberg; Undeland, Tore Marvin (Journal article; Peer reviewed, 2012)In the future, large offshore wind turbines are expected to reach a rating of 10 MW. To reduce the corresponding weight increase of the nacelle, research has started to focus on solutions to omit the step-up transformer ... -
Advanced Battery Diagnosis for Electric Vehicles
Lamichhane, Chudamani (Master thesis, 2008)Summary Literatures on battery technologies and diagnosis of its parameters were studied. The innovative battery technologies from basic knowledge to world standard testing procedures were analysed and discussed in the ... -
An insight into geometry and orientation of capacitors for high-speed power circuits
Tiwari, Subhadra; Midtgård, Ole-Morten; Undeland, Tore Marvin (Chapter, 2018)SiC transistors can switch extremely fast. Often turn-off di/dt is reduced to limit the turn-off over voltages due to the stray inductances in the commutation loops. Thus, the potential low switching losses are not met. ... -
An investigation on gridconnectable single phase photovoltaic inverters
Gundersen, Bjørnar (Master thesis, 2010)Several inverter topologies for use with power conditioning of photovoltaic modules were investigated with both national and international requirements in mind, as well as also practical challenges and the ability to be ... -
Analyzing and Testing of New Silicon Carbide Components for Down Hole Oil Applications
Yang, Xiaoxia (Master thesis, 2014)High temperature power converter becomes possible due to the development of SiC power technology. The inherent properties of wide bandwidth, high breakdown electrical field and high thermal conductivity give commercially ... -
Bi-directional power converters for smart grids: Isolated bidirectional DC-DC converter
Gerekial, Welday Gebremedihn (Master thesis, 2014)AbstractAs part of my master thesis I have take part in Isolated Bidirectional DC_DC LLC resonant converter from Eltak company. Application of power exchanges takes place in either direction using two unidirectional DC-DC ... -
Challenges on drive circuit design for series-connected SiC power transistors
Peftitsis, Dimosthenis; Rabkowski, Jacek; Nee, Hans-Peter; Undeland, Tore Marvin (Journal article; Peer reviewed, 2017)The breakdown voltages of the currently available 1.2 and 1.7-kV classes Silicon Carbide (SiC) transistors are not sufficient to operate under medium blocking voltages. On the other hand, the fabrication yields of the ... -
Characterization of body diodes in the-state-of-the-art SiC FETs-Are they good enough as freewheeling diodes?
Tiwari, Subhadra; Abuishmais, Ibrahim Abed; Langelid, John Kåre; Lund, Richard; Midtgård, Ole-Morten; Undeland, Tore Marvin (Chapter, 2018)This paper investigates the switching phenomenon of body diodes in the state-of-the-art discrete SiC FETs. A comparative performance evaluation of the body diodes in planar and double-trench SiC MOS-FETs, and trench cascode ... -
Comparative evaluation of a commercially available 1.2 kV SiC MOSFET module and a 1.2 kV Si IGBT module
Tiwari, Subhadra; Midtgård, Ole-Morten; Undeland, Tore Marvin (Chapter, 2016)In this paper, a comparative performance evaluation of a 1.2 kV SiC MOSFET module and a 1.2 kV Si IGBT module is carried out under a series of different conditions such as similar dv/dt, di/dt, voltage overshoot, current ... -
Comparison between Si MOSFETs and GaN HEMTs with special emphasis on low load problems occuring in the LLC resonant converter
Blingsmo, Lyder Rumohr (Master thesis, 2019)Det stilles store krav til likerettere brukt til å forsyne datasentere med kraft. Et av kravene er høy virkningsgrad. En av de vanligste topologiene brukt til dette formålet består av en PFC-likeretter, for å få sinusformet ... -
Control of Medium Voltage Multi-phase machines: Implementation of Minimum loss Synchronous Optimal Modulation with Neutral Point Balancing
Neupane, Krishna (Master thesis, 2014)The total loss of an inverter can be reduced by reducing switching losses and harmonics losses. However, the harmonics increases with the reduction of switching frequency and special technique is required to get the overall ... -
Control of Multi-terminal VSC-HVDC Systems
Haileselassie, Temesgen Mulugeta (Master thesis, 2008)The North Sea has a vast amount of wind energy with largest energy per area densities located about 100-300Km of distance from shore. Should this energy be tapped by offshore wind farms, HVDC transmission would be the more ... -
Control of Offshore Passive Platform System Voltage and Frequency through Control of Onshore Back-to-Back Voltage Source Converters
Høvik, Kristin Malene (Master thesis, 2011)This thesis work shows implementation and testing of existing control strategies in a novel offshore passive platform configuration. Control of the platform voltage and frequency is done through control of a shore-based ... -
Control of Power Electronic Converters in Distributed Power Generation Systems: Evaluation of Current Control Structures for Voltage Source Converters operating under Weak Grid Conditions
Midtsund, Tarjei (Master thesis, 2010)The performance of different current controller structures for Voltage Source Converters (VSC) under weak grid conditions caused by large grid impedance is investigated. The VSC is synchronized to the grid by a Phase Locked ... -
Design and measurement of a passive thrust magnetic bearing for a bearingless motor
Severson, Eric; Røkke, Astrid; Nilssen, Robert; Undeland, Tore Marvin; Mohan, Ned (IEEE Industrial Electronics Society. Annual Conference. Proceedings;IECON 2013, Journal article; Peer reviewed, 2013)The design and construction of a permanent magnet thrust bearing for a bearingless motor is presented and a measurement technique is proposed to characterize the bearing. Optimal design of a bearingless motor requires the ... -
Design of Dual Purpose No-Voltage Combined Windings for Bearingless Motors
Severson, Eric Loren; Nilssen, Robert; Undeland, Tore Marvin; Mohan, Ned (Journal article; Peer reviewed, 2017)A winding design approach is proposed to create a single motor winding, which is able to produce both radial force and torque. This approach can be used to design new bearingless motors, as well as to transform conventional ... -
Direct Driven Permanent Magnet Synchronous Generators with Diode Rectifiers for Use in Offshore Wind Turbines
Reigstad, Tor Inge (Master thesis, 2007)This work is focused on direct-driven permanent magnets synchronous generators (PMSG) with diode rectifiers for use in offshore wind turbines. Reactive compensation of the generator, power losses and control of the generator ... -
Distributed Generation - Power Electronic Converters, Communication and Control
Hoff, Erik Stjernholm (Doktoravhandlinger ved NTNU, 1503-8181; 2007:89, Doctoral thesis, 2007)This thesis tries to explain the changes in the control of power electronic converters that are possible by the use of communication. Many of the renewable energy sources such as photovoltaic panels are geographically ... -
Driver stage implementation with improved turn-on and turn-off delay for wide band gap devices
Spro, Ole Christian; Guidi, Giuseppe; Ljøkelsøy, Kjell; Hernes, Magnar; Midtgård, Ole-Morten; Undeland, Tore Marvin (Chapter, 2018)This paper presents a driver topology intended for WBG devices with the goal of improving the switching performance. In particular, the initial delay time of the switching transient was targeted. In high power and high ...