Sökning: "Passivity Analysis"

Visar resultat 6 - 10 av 25 avhandlingar innehållade orden Passivity Analysis.

1. 6. Subsynchronous Resonance in Doubly Fed Induction Generator based Wind farms

   Författare :Selam Chernet; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; generalized Nyquist criterion GNC .; Passivity; doubly-fed induction generator DFIG ; subsynchronous controller interaction SSCI ; Wind power; Impedance-based analysis; induction generator effect IGE ; subsynchronous resonance SSR ;

   Sammanfattning : The objective of this thesis is to investigate the risk for instabilities due to subsynchronous resonance (SSR) conditions in large wind farms connected to series-compensated transmission lines. In particular, the focus is on doubly-fed induction generator (DFIG) based wind farms. LÄS MER

3. 7. Converter interactions in VSC-based HVDC systems

   Författare :Georgios Stamatiou; Chalmers tekniska högskola; []
   Nyckelord :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;

   Sammanfattning : 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. LÄS MER

4. 8. ”See there I’m stuck now!” Samtalsdeltagares orientering mot att tala svenska i amerikasvenska dialektintervjuer

   Författare :Henrietta Adamsson Eryd; Göteborgs universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; American Swedish; dialect interviews; activity analysis; conversation analysis; communicative project; activity roles; marked and unmarked code alternation; repair; side sequences; metalinguistic comments; meta perspective; inner and outer frame;

   Sammanfattning : This thesis is a qualitative investigation of a communicative project called tala svenska (speak swedish) in American Swedish dialect interviews. The aim of the study is to analyze and describe the communicative project. Based on this aim the study investigates the interviews as activities with accompanying frames, roles and phases. LÄS MER

5. 9. Nanocomposite films for corrosion protection

   Författare :Majid Sababi; Jinshan Pan; J.M.C. (Arjan) Mol; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; corrosion protection; nanocomposite; coating; tool alloy; layer‐by‐layer; polarization; passivity; nanomechanical; topography; Mefp‐ 1; ceria nanoparticle; PAni; UV‐cure; AFM; Peak Force QNM; EIS; SEM; CRM; QCM‐D; ATR‐FTIR;

   Sammanfattning : This thesis describes technical and scientific aspects of new types of composite films/coatings for corrosion protection of carbon steel, composite films with nanometer thickness consisting of mussel adhesive protein (Mefp‐1) and ceria nanoparticles, and polymeric composite coatings with micrometre thickness consisting of conducting polymer and ceria nanoparticles in a UV‐curing polyester acrylate (PEA) resin.The influence of microstructure on corrosion behaviour was studied for a Fe‐Cr‐V‐N alloy containing micro‐sized nitrides with different chemical composition spread in martensitic alloy matrix. LÄS MER

7. 10. Trafikpolitik och regional omvandling : Beslutsprocesserna om isbrytningen längs Norrlandskusten 1940-1975

   Författare :Martin Eriksson; Lena Andersson-Skog; Jan Ottosson; Thomas Pettersson; Lars Magnusson; Umeå universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; economic history; Sweden; Norrland; ice-breaker policy; regional interest groups; institutional analysis; corporatism; concertation; policy networks; Economic history; Ekonomisk historia; ekonomisk historia; Economic History;

   Sammanfattning : The aim of this thesis is to understand the decision-making processes concerning ice-breaking along the coast of Norrland, with the specific aim to analyse the activities of regional interest groups in the Norrland region and government agents at different administrative levels at the key stages of the decision-making processes: initiation, drafting and decision-making. The thesis also explores how institutional factors at different administrative levels affected the agents that were involved at those stages of the decision-making processes. LÄS MER