Sökning: "Torbjörn Lindmark"

Hittade 2 avhandlingar innehållade orden Torbjörn Lindmark.

  1. 1. Samhällskunskapslärares ämneskonceptioner

    Författare :Torbjörn Lindmark; Anna Larsson; Arja Virta; Umeå universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Subject conceptions; internal and external frame factors; Ämnesdidaktik; Samhällskunskapsdidaktik; pedagogik; Education;

    Sammanfattning : In this thesis, I will discuss subject conceptions among social studies teachers who work in upper secondary schools. The aim of this study is to investigate and analyse subject conceptions among social studies teachers and their relationship to the teachers’ personal background. LÄS MER

  3. 2. Modelling, Analysis, and Control Aspects of a Rotating Power Electronic Brushless Doubly-Fed Induction Generator

    Författare :Naveed ur Rehman Malik; Chandur Sadarangani; Torbjörn Thiringer; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Brushless doubly-fed induction generator; dual vector control; dynamic model; induction machine; internal model control; Lindmark concept; low-voltage ride-through; passive resistive network; rotating power electronic converter; rotating exciter; symmetrical faults; synchronous machine; thermal model; unity power factor; unsymmetrical faults; vector control; wind turbines.; Electrical Engineering; Elektro- och systemteknik; Energy Technology; Energiteknik;

    Sammanfattning : This thesis deals with the modeling, analysis and control of a novel brushlessgenerator for wind power application. The generator is named as rotatingpower electronic brushless doubly-fed induction machine/generator (RPEBDFIM/G).A great advantage of the RPE-BDFIG is that the slip power recoveryis realized in a brushless manner. LÄS MER