Sökning: "lower hybrid current drive"

Visar resultat 1 - 5 av 8 avhandlingar innehållade orden lower hybrid current drive.

1. 1. Lower hybrid current drive in the Tore Supra tokamak

   Författare :Emelie Nilsson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fusion plasma physics; fast electron dynamics; launcher; tokamak; radio frequency waves; lower hybrid current drive;

   Sammanfattning : To control and extract energy from nuclear fusion reactions, a mixture of deuterium and tritium gases must be heated to temperatures on the order of 100 million degrees, whilst maintaining a sufficiently high density. The main difficulty is to confine the ionised gases, i.e. plasma, until the rate of fusion reactions becomes large enough. LÄS MER

3. 2. Modeling and Control of a PMSynRel Drive for a Plug-InHybrid Electric Vehicle

   Författare :Shuang Zhao; Chandur Sadarangani; Sigurd Övrebö; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electric drive; feasible region; inductance spatial harmonics; integrated charger; permanent-magnet assisted synchronous reluctance machine; plug-in hybrid-electric vehicle; polarity detection; saturation and cross-saturation; sensorless control; signal injection; transient modeling.;

   Sammanfattning : This thesis presents two transient models for a prototype integrated charger for use in a plug-in hybrid-electrical vehicle application. The models can be useful in order to develop control algorithms for the system or to recommend improvements to the machine design. LÄS MER

4. 3. Coupling and Absorption of Lower Hybrid Waves in Current Profile Control Experiments in the JET Tokamak

   Författare :Annika Ekedahl; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : Current drive with radio frequency waves in the lower hybrid frequency range is an important method of current profile control via non-inductive current drive in tokamaks. This thesis is concerned with profile control experiments, carried out with the lower hybrid current drive system in the Joint European Torus (JET) tokamak, with the aim to explore scenarios for operation in high confinement regimes with peaked pressure profiles. LÄS MER

5. 4. Integrated Compact Drives for Electric and Hybrid Electric Vehicles

   Författare :Lebing Jin; Hans-Peter Nee; Staffan Norrga; Oskar Wallmark; Robert Pilawa-Podgurski; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; distributed control; electric vehicle; energy storage capability; integrated motor drive; modular converter; modulation; power losses; stacked polyphase bridges converter; switching frequency; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : To develop more competitive solutions, one of the trends in the development of drive systems for electric and hybrid electric vehicles (EVs/HEVs) is to integrate the power electronic converter and the electric motor. This thesis aims to investigate the performance and the operation of modular converters in integrated motor drive systems for EVs/HEVs. LÄS MER

7. 5. Investigation of a Multilevel Inverter for Electric Vehicle Applications

   Författare :Oskar Josefsson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Plug-in Electric Vehicle PEV ; Electric Vehicle EV ; LiFePO4.; Integrated Charger; Efficiency; Drive Cycle; Battery modelling; Multilevel Inverter MLI ; Two-level Inverter TLI ;

   Sammanfattning : Electrified vehicles on the market today all use the classical two-level inverter as the propulsion inverter. This thesis analyse the potential of using a cascaded H-bridge multilevel inverter as the propulsion inverter. LÄS MER