Search for dissertations about: "ac thesis"

Showing result 1 - 5 of 402 swedish dissertations containing the words ac thesis.

2. 1. Modeling of Modular Multilevel Converters for Stability Analysis

   Author : Luca Bessegato; Stefan Östlund; Staffan Norrga; Lennart Harnefors; Xiongfei Wang; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Modular multilevel converters MMCs ; stability; admittance; frequency-domain analysis; linearization techniques; current control; voltage control; ac ac converters; railway engineering.; Modulära multinivåomvandlare MMC ; stabilitet; admittans; frekvensanalys; linjäriseringsmetoder; strömreglering; spänningsreglering; ac ac omvandlare; järnvägsteknik.; Electrical Engineering; Elektro- och systemteknik;

   Abstract : Modular multilevel converters (MMCs) have recently become the state-of-the-art solution for various grid-connected applications, such as high-voltage direct current (HVDC) systems and flexible alternating current transmission systems (FACTS). Modularity, scalability, low power losses, and low harmonic distortion are the outstanding properties that make MMCs a key technology for a sustainable future. READ MORE

4. 2. High precision Ac susceptibility : a probe to exchange bias, and flux creep in high-Tcmaterials

   Author : Johan Jönsson; KTH; []
   Keywords : ;

   Abstract : .... READ MORE

5. 3. Acromioclavicular joint dislocations. Epidemiology, radiography and outcome

   Author : Jonas Nordin; Lund Ortopedi; []
   Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; AC-led; Akromioklavikularled; Luxation; Epidemiologi; Kirurgi; Röntgen; AC-joint; Acromioclavicular joint; Acromioclavicular dislocation; Separation; Epidemiology; Radiography; Surgery; Outcome;

   Abstract : Background: Acromioclavicular joint (ACJ) dislocations are common and frequently affecting young adults injured during sports. The Rockwood classification system is used to grade the dislocations according to the extent of injury to the soft tissues stabilizing the joint. READ MORE

6. 4. Stability of Low-Frequency AC Railways : Models and Transient Stability

   Author : John Laury; Lars Abrahamsson; Math Bollen; Pablo Arboleya; Luleå tekniska universitet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electric Power Engineering; Elkraftteknik;

   Abstract : Low-frequency AC railway grids are unique in the sense that a only few countries around the world uses them, still however, they are an important parts of their countries infrastructures. Due to the usage of a dierent frequency than the public grid of the country, conversion of frequency is needed for the interconnection. READ MORE

7. 5. Integral and local AC-susceptibility : instrumentation and applications

   Author : Valter Ström; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Condensed matter physics; Kondenserade materiens fysik;

   Abstract : This thesis presents my mostly unpublished experimental work related to two major contributions with the design of: A high precision and versatile bulk average(or integral) AC-susceptometer and its application to investigations of exchange anisotropy in Co multilayers. A novel Local Susceptibility measurement technique exploiting the narrow gap in inductive ring-heads in magnetic recording technology. READ MORE