Search for dissertations about: "high voltage"

Showing result 1 - 5 of 700 swedish dissertations containing the words high voltage.

2. 1. On high-frequency soft-switching DC-converters for high-voltage applications

   Author : Per Ranstad; KTH; []
   Keywords : soft-switching; dc-converter; high-frequency; high-voltage;

   Abstract : .... READ MORE

4. 2. Silicon-Carbide-Based High-Voltage Submodules for HVDC Voltage-Source Converters

   Author : Keijo Jacobs; Hans-Peter Nee; Staffan Norrga; Marc Hiller; KTH; []
   Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; Silicon carbide; HVDC converters; voltage source converters; modular multilevel converters; submodule topologies; metal-oxide-semiconductor field-effect transistor MOSFET ; insulated-gate bipolar-transistor IGBT ; power semiconductor devices; high-voltage; Electrical Engineering; Elektro- och systemteknik;

   Abstract : In order to transition to renewable energy sources and simultaneously meet the increasing demand for electrical energy, highly flexible and efficient grids are required. High-voltage direct-current (HVDC) transmission and grids are foreseen to be a vital part of the future electricity grid. READ MORE

5. 3. Thermoplastic Insulation for High Voltage Cables

   Author : Yingwei Ouyang; Chalmers University of Technology; []
   Keywords : NATURVETENSKAP; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; NATURAL SCIENCES; ENGINEERING AND TECHNOLOGY; ENGINEERING AND TECHNOLOGY; polyethylene; insulation; polypropylene; blends; thermoplastic; high voltage; polymer;

   Abstract : High voltage direct current (HVDC) cables that seamlessly integrate renewables have an important contribution to the modern world’s efforts towards a more sustainable future. Extruded HVDC cables that efficiently and reliably transport electricity require robust insulation materials with good thermomechanical and dielectric properties. READ MORE

6. 4. Charge Accumulation in Hybrid High Voltage Insulation

   Author : Mats Sjöberg; Chalmers University of Technology; []
   Keywords : dielectric barrier; charge accumulation; high voltage; dielectric barrier discharge; dielectric coating; hybrid insulation; electric field distribution; discharge modelling; breakdown strength; charge conditioning;

   Abstract : This thesis deals with the novel idea of controlling the electric stress or field distribution in a hybrid air - solid-dielectric high voltage insulation by promoting accumulation of surface charges on the internal interfacial layers in the combined (hybrid) dielectric structure. Primarily, applications are expected to be found in high voltage dc systems and as a method to improve the resistance against insulation failure by overvoltages, e. READ MORE

7. 5. Electric Power Generation and Storage Using a High Voltage Approach

   Author : Björn Bolund; Mats Leijon; Hans Bernhoff; Tore Undeland; Uppsala universitet; []
   Keywords : Engineering physics; Flywheel; Generation; Generator; High Voltage; Power flow; Poynting; Teknisk fysik;

   Abstract : Production and consumption of electricity have grown enormously during the last century. No mater what the primary source of energy is, almost all generation of electricity comes from conversion of a rotational movement in a generator. The aim of this thesis is to see how high voltage technology influence production and storage of electricity. READ MORE