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Visar resultat 1 - 5 av 36 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. Coordinated Control of HVDC Links in Transmission Systems

    Författare :Robert Eriksson; Lennart Söder; Kjetil Uhlen; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; coordinated control; dynamic security; exact-feedback linearization; feedforward control; HVDC poser modulation; Electric power engineering; Elkraftteknik;

    Sammanfattning : Dynamic security limits the power transfer capacity between regions and therefore has an economic impact. The power modulation control of high-voltage direct current (HVDC) links can improve the dynamic security of the power system. LÄS MER

  3. 2. Fluid Flow Phenomena, Inclusion Characteristics and some Heat Transfer Phenomena during Filling of an Ingot Mmold

    Författare :Robert Eriksson; KTH; []
    Nyckelord :up-hitt teeming; model powder; inclusions; plant trials; thermal diffusivity; fluid flow; physical modeling;

    Sammanfattning : Clean steel production requires a good understanding of theinclusion characteristics at all stages of the steelmakingprocess. So far there exist little information about theformation and evolution of inclusions during the filling ofingot molds. LÄS MER

  4. 3. Heat transfer,inclusion characteristics and fluid flow phenomena during up-hill teeming

    Författare :Robert Eriksson; KTH; []
    Nyckelord :Laser flash method; thermal diffusivity; slags; inclusions; water model; ingot casting; up-hill teeming;

    Sammanfattning : Clean steel production requires good control of the sizedistribution and the composition of the inclusions at allstages of the steel making process. So far, there exists verylittle information on the behavior of the inclusion populationduring ingot casting of steel. LÄS MER

  5. 4. High-temperature degradation of plasma sprayed thermal barrier coating systems

    Författare :Robert Eriksson; Sten Johansson; Christer Burman; Linköpings universitet; []
    Nyckelord :TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : Thermal barrier coating systems (TBCs) are used in gas turbines to prevent high-temperature degradation of metallic materials in the combustor and turbine. One of the main concerns regarding TBCs is poor reliability, and accurate life prediction models are necessary in order to fully utilise the beneficial effects of TBCs. LÄS MER

  7. 5. Security-centered Coordinated Control in AC/DC Transmission Systems

    Författare :Robert Eriksson; Lennart Söder; Jonas Persson; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electric power engineering; Elkraftteknik;

    Sammanfattning : .... LÄS MER