Sökning: "power loss"

Visar resultat 1 - 5 av 401 avhandlingar innehållade orden power loss.

  1. 1. Modelling approaches for audio frequency power transformers

    Detta är en avhandling från Stockholm : Elektrotekniska system

    Författare :Julius Krah; KTH.; [2003]
    Nyckelord :power transformer; audio frequency; loss; hysteresis; eddy currents; skin effect. Leakage inductance;

    Sammanfattning : The development of HVDC converters, local generation andtractions systems increases the demand for power converters.While a lot of studies have been conducted on the powerelectronics, there are still open questions concerning thecontained power transformer that operates at a few kilohertz. LÄS MER

  2. 2. Process Control and Simulation of Ferromagnetic Strip in the Power Transformers and Electrical Machines Applications Electric power systems

    Detta är en avhandling från Västerås, Sweden : Mälardalen University

    Författare :Kourosh Mousavi Takami; Mälardalens högskola.; [2009]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Strip; electrical machines; transformer; cold rolling mills; process; automation; control; Band; elektriska maskiner; transformatorer; kallvalsningsverk; processautomation; reglerteknik; TECHNOLOGY Electrical engineering; electronics and photonics Electric power engineering; TEKNIKVETENSKAP Elektroteknik; elektronik och fotonik Elkraftteknik; Energy- and Environmental Engineering; energi- och miljöteknik;

    Sammanfattning : This thesis investigates optimization of the control of electrical and thermal equipment by using FEM and CFD modeling in combination with dynamic simulation models. The thesis focuses on the production of electrical strips and the control system with the aim of reducing losses and improving magnetic properties. LÄS MER

  3. 3. Artificial Intelligence-Based Characterization and Classification Methods for Power Quality Data Analytics

    Detta är en avhandling från Luleå : Luleå University of Technology

    Författare :Azam Bagheri; Luleå tekniska universitet.; [2018]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Power System; power Quality; Voltage Dip; Big Data; Deep Learning; Machine Learning; Active Learning; Consensus Contriol; Electric Power Engineering; Elkraftteknik;

    Sammanfattning : One of the important developments in the electric power system is the fast increasing amount of data. An example of such data is formed by the voltages and currents coming from power-quality measurements. LÄS MER

  4. 4. Junction Barrier Schottky Rectifiers in Silicon Carbide

    Detta är en avhandling från Kista : Mikroelektronik och informationsteknik

    Författare :Fanny Dahlquist; KTH.; [2002]
    Nyckelord :silicon carbide; JBS rectifier; Junction Barrier Schottky JBS ; Schottky rectifier; MPS rectifier; power rectifier; punch-through design; power loss; high blocking voltage;

    Sammanfattning : .... LÄS MER

  5. 5. On Gate Drivers for MOS-Controlled Power Devices and dv-dt Filters for Train Traction Converters

    Detta är en avhandling från Stockholm : KTH Royal Institute of Technology

    Författare :Erik Velander; KTH.; [2017]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Power semiconductor devices; DC-AC power converters; Silicon carbide; Insulated gate bipolar transistors; P-i-n diodes; Schottky diodes; Traction motors; Power MOSFET; Krafthalvledare; DC-AC kraftomvandlare; kiselkarbid; IGBT; P-i-n dioder; Schottky dioder; traktionsmotorer; Effekt-MOSFET; Electrical Engineering; Elektro- och systemteknik;

    Sammanfattning : In this thesis, low-loss gate-drive solutions and a proposed dv/dt-filter have been investigated with focus on train traction converters with dv/dt constraints.By using the silicon carbide (SiC) junction field-effect transistor (JFET), the switching losses can be significantly reduced compared to the commonly used insulated-gate bipolar transistor (IGBT), but complex gate-driver solutions are required for high utilization in terms of loss reduction. LÄS MER