Sökning: "Electric currents"

Visar resultat 26 - 30 av 105 avhandlingar innehållade orden Electric currents.

  1. 26. Organizational Capabilities : A Study of Electrical Power Transmission Equipment Manufacturers, 1878-1990

    Författare :Fredrik Tell; Lars Lindkvist; Christian Knudsen; Keith Pavitt; Linköpings universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Organizational Capabilities; Electrical Manufacturers; Power Transmission; Business History; Technological Change; Knowledge-based Theory of the Firm; ABB; AEG; Alsthom; ASEA; Brown Boveri; CGE; GEC; General Electric; Siemens; Westinghouse; Business Studies;

    Sammanfattning : Organizational capabilities of large industrial firms constitute a pillar in Alfred Chandler's theory of the emergence of managerial capitalism. Science based firms represent one important sector within such an economic context. LÄS MER

  3. 27. On Deep Machine Learning Based Techniques for Electric Power Systems

    Författare :Ebrahim Balouji; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Deep Learning; Cable faults; phase locked loop; Flicker; Harmonics and Interharmonics; Reinforcement learning; Voltage Dip; Active Power filter; Machine Learning; Voltage fluctuation; Partial Discharges;

    Sammanfattning : This thesis provides deep machine learning-based solutions to real-time mitigation of power quality disturbances such as flicker, voltage dips, frequency deviations, harmonics, and interharmonics using active power filters (APF). In an APF the processing delays reduce the performance when the disturbance to be mitigated is tima varying. LÄS MER

  4. 28. On the Design of Ultra-fast Electro-Mechanical Actuators

    Författare :Ara Bissal; Göran Engdahl; Torbjörn Lembke; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electro-mechanical drive; Circuit breakers; HVDC transmission; Eddy currents; Finite element; Electromagnetic; Thermal; Mechanical; Coils; Armature; Image motion analysis.;

    Sammanfattning : The continuously increasing demand for connecting electric grids with remote renewable energy sources such as wind power and photovoltaic cells has rekindled interest in high voltage direct current (HVDC) multi-terminal networks. Although HVDC networks have numerous benefits, their adoption relies entirely on the availability of HVDC circuit breakers which, compared to traditional alternating current circuit breakers, have to operate in a time frame of milliseconds. LÄS MER

  5. 29. Modelling and design approaches of magnetostrictive actuators

    Författare :Mattias Oscarsson; Göran Engdahl; Tord Cedell; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Magnetostriction; Terfenol; Coil optimisation; Leakage flux; Modelling tools; Eddy currents; Magnetostriktion; Electrical engineering; Elektroteknik;

    Sammanfattning : A magnetostrictive material elongates when it is subjected to a magnetic field. This effect can then be used to design powerful actuators. LÄS MER

  7. 30. Interactions between battery and power electronics in an electric vehicle drivetrain

    Författare :Alexander Bessman; Göran Lindbergh; Pontus Svens; Oskar Wallmark; Torbjörn Thiringer; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Chemical Engineering; Kemiteknik; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : The electric machine and power electronics in electric and hybrid electric vehicles inevitably cause AC harmonics on the vehicle's DC-link. These harmonics can be partially filtered out by large capacitors, which today are overdimensioned in order to protect the vehicle's battery pack. LÄS MER