Search for dissertations about: "Lars Abrahamsson"

Showing result 1 - 5 of 6 swedish dissertations containing the words Lars Abrahamsson.

  2. 1. Optimal Railroad Power Supply System Operation and Design : Detailed system studies, and aggregated investment models

    Author : Lars Abrahamsson; Lennart Söder; Arnd Stephan; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Abstract : Railway power supply systems (RPSSs) differ mainly from public power systems from that the loads are moving. These moving loads are motoring trains. Trains can also be regenerating when braking and are then power sources. These loads consume comparatively much power, causing substantial voltage drops, not rarely so big that the loads are reduced. READ MORE

  4. 2. Railway Power Supply Models and Methods for Long-term Investment Analysis

    Author : Lars Abrahamsson; Lennart Söder; Magnus Olofsson; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrical engineering; Elektroteknik;

    Abstract : The aim of the project is to suggest an investment planning programwhere the welfare of the society is to be maximized. In order to beable to decide on a wise investment plan, one needs to know theconsequences of different choices of power system configurations. READ MORE

  5. 3. Meeting increased logistical demands : Developing as a small- and medium-sized system supplier

    Author : Inga-Lill Carlsson; Mats Abrahamsson; Håkan Aronsson; Jens Hultman; Lars Bengtsson; Linköpings universitet; []
    Keywords : TECHNOLOGY; TEKNIKVETENSKAP;

    Abstract : Many subcontractors choose to implement a strategy of “system supply” in order to meetincreasing global competition. They are then confronted with increased demands to take agreater overall responsibility in this role. READ MORE

  6. 4. Towards System Supply : Development of Small and Medium-Sized Contract Manufacturers

    Author : Inga-Lill Carlsson; Håkan Aronsson; Lars Bengtsson; Mats Abrahamsson; Per Hilletofth; Linköpings universitet; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES;

    Abstract : One way for a small subcontractor to meet increasing global competition is to develop a system supplying ability, implying a transition in the supply chain toward a larger overall responsibility. As large corporations outsource parts of their manufacturing and services, many small and medium-sized enterprise (SME) suppliers are expected to deepen their capabilities and take on the role of system suppliers. READ MORE

  7. 5. Stability of Low-Frequency AC Railways : Models and Transient Stability

    Author : John Laury; Lars Abrahamsson; Math Bollen; Pablo Arboleya; Luleå tekniska universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electric Power Engineering; Elkraftteknik;

    Abstract : Low-frequency AC railway grids are unique in the sense that a only few countries around the world uses them, still however, they are an important parts of their countries infrastructures. Due to the usage of a dierent frequency than the public grid of the country, conversion of frequency is needed for the interconnection. READ MORE