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Visar resultat 1 - 5 av 6 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Off the grid

   Författare :Mike Bode; Staffan Schmidt; Göteborgs universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; artistic research; visual concepts; situated image; dialogue; ecological and political engagement; off grid living; housing estate suburbia; travel; self-definition; community; institution; isomorphic; lived third space;

   Sammanfattning : Off the grid is an artistic research thesis which puts a Swedish housing estate in a video interview dialogue with homeowners in the Northeastern US through focusing on three topics: travel, self-definition, and community. Based on the situated, visual and conceptual image the project merges seemingly incompatible experiences: eight residents in Husby, an immigrant community outside Stockholm, and eight households not connected to the utility grid, in upstate areas of New England and New York State – and two artistic researchers at University of Gothenburg. LÄS MER

3. 2. Anxious Leviathan : the powerful vulnerability of strong states

   Författare :Tadek Markiewicz; Philip Cunliffe; Ingvild Bode; University of Kent; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES;

   Sammanfattning : Why do strong countries implement narratives of vulnerability in their wartime public communication? This dissertation solves the puzzling practice of powerful actors pursuing identifications we commonly associate with weakness and political failure. It is the first systematic study analyzing vulnerability narratives as a practice of statecraft and warcraft. LÄS MER

4. 3. Dynamic Programming and Time-Varying Delay Systems

   Författare :Bo Lincoln; Institutionen för reglerteknik; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; control engineering; Automatiska system; robotteknik; reglerteknik; robotics; Automation; Stability analysis; Time-varying delays; Dynamic programming; Switched linear systems;

   Sammanfattning : This thesis is divided into two separate parts. The first part is about Dynamic Programming for non-trivial optimal control problems. The second part introduces some useful tools for analysis of stability and performance of systems with time-varying delays. LÄS MER

5. 4. Modelling and control of a line-commutated HVDC transmission system interacting with a VSC STATCOM

   Författare :Paulo Fischer de Toledo; Hans-Peter Nee; Gustaf Ohlsson; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Keywords : HVDC transmission; LCC – Line-commutated Current-source Converter; STATCOM; VSC – Voltage Source Converter; Space-Vector complex vector ; transfer-function; frequency-domain analysis; Electrical engineering; electronics and photonics; Elektroteknik; elektronik och fotonik;

   Sammanfattning : The interaction of an HVDC converter with the connected power system is of complex nature. An accurate model of the converter is required to study these interactions. The use of analytical small-signal converter models provides useful insight and understanding of the interaction of the HVDC system and the connected system components. LÄS MER

7. 5. Modeling and Control of Voltage Source Converters Connected to the Grid

   Författare :Michael Lindgren; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; voltage source converter; switching frequency; pulse width modulation; IGBT valve; power electronics; small-signal; L-filter; LCL-filter; transfer function; line filter; active filtering; frequency response; sampling frequency;

   Sammanfattning : This thesis deals with the modeling and control of pulse width modulated (PWM) voltage source converters connected to the grid. When voltage source converters are connected to the grid, the power quality and the dynamic performance are affected by the line filter connected between the converter and the grid, and by nonlinearities caused by the switching converter. LÄS MER