Search for dissertations about: "Net damping"

Showing result 1 - 5 of 8 swedish dissertations containing the words Net damping.

  2. 1. Converter interactions in VSC-based HVDC systems

    Author : Georgios Stamatiou; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Symbolic eigenvalue expressions; Frequency Domain Analysis; Droop control; Net damping; VSC; Passivity Analysis; MTDC; Poor damping; HVDC;

    Abstract : The main objective of this thesis is to perform stability and control studies in the area of VSC-HVDC. A major part of the investigation focuses on the explanation of poorly-damped conditions and instability that are linked to dc-side resonances. READ MORE

  4. 2. Analysis of VSC-based HVDC systems

    Author : Georgios Stamatiou; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; HVDC; MMC; MTDC; Poor damping; Symbolic eigenvalue expressions; Droop control; Passivity Analysis; Net damping; Frequency Domain Analysis; VSC;

    Abstract : The main objective of this thesis is to perform stability and control studies in the area of VSC-HVDC systems. A major part of the investigation focuses on the development of procedures, whose aim is to understand, explain and avoid poorly-damped conditions or instability that may appear due to dc-side resonances, which stem from the interaction of converters and passive elements in such systems. READ MORE

  5. 3. Hydrodynamics of very shallow lakes - A study in Lake Krankesjön, Sweden

    Author : Charlotta Borell Lövstedt; Avdelningen för Teknisk vattenresurslära; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; alternative stable states; field measurements; reed; resuspension; wave damping; waves; differential heating; vegetation; convective currents;

    Abstract : Shallow lakes have great ecological and recreational values. They are also largely affected by humans, mainly through eutrophication, and great efforts are therefore being put into the understanding of these ecosystems. The knowledge is however not complete, and more research is needed to manage these lakes in a sustainable way. READ MORE

  6. 4. Image processing methods to study the living hearing organ

    Author : Miriam von Tiedemann; Karolinska Institutet; Karolinska Institutet; []
    Keywords : ;

    Abstract : In this thesis we are developing image processing methods allowing one to probe the structure and function of the mammalian hearing organ, an intricate cellular assembly with a highly specialized three-dimensional organization. Confocal as well as electron microscopy was used for image acquisition. READ MORE

  7. 5. Airway hyperresponsiveness and viral recognizing toll-like receptors

    Author : Magnus Starkhammar; Karolinska Institutet; Karolinska Institutet; []
    Keywords : ;

    Abstract : Common colds caused by viruses are, in healthy individuals, usually self-limited and with relatively mild symptoms. In asthmatic individuals, respiratory viruses can burst the defense immune system and trigger asthma exacerbations, including causing airway hyperresponsiveness (AHR). READ MORE