Sökning: "exciter"

Visar resultat 1 - 5 av 15 uppsatser innehållade ordet exciter.

  1. 1. Assessing the Impact of High Grid Penetration of Renewable Energy on Power System Stability

    Kandidat-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :William Nordberg; Alexander Leijonhielm; [2022]
    Nyckelord :Power System Stability; Variable Renewable Energy; Power System Stabilizers; Grid Following Converters; Grid Forming Converters;

    Sammanfattning : In this report, the effect that a higher penetration ofrenewable energy sources has on electric power grid stability isevaluated. The report also compares different methods of stabilizingan unstable grid. LÄS MER

  3. 2. Vibration analysis of a fast response brushless excitation system

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Elektricitetslära

    Författare :Emma Pålsson; [2019]
    Nyckelord :vibrations; frequency analysis; FRBE; controlled rectification; hydropower; exciter; generator; fast response;

    Sammanfattning : The aim of this study is to measure and analyze vibrations on a fast response brushless exciter (FRBE) at a real hydropower plant and identify vibration origins through frequency analysis. Moreover, the observed vibrations are evaluated in relation to generator vibration standards and estimated tangential eigenfrequencies of the studied FRBE. LÄS MER

  4. 3. Thermal modeling of power electronic components in excitation systems

    Uppsats för yrkesexamina på avancerad nivå,

    Författare :Fredrik Widberg; [2019]
    Nyckelord :Excitation systems; Power electronics; Thermal modeling;

    Sammanfattning : This thesis work aims at developing a model in Visual Basic for Applications and Microsoft Excel that can be used to predict temperatures in semiconductor devices for two commercial products made by Voith Hydro AB, and via simulation of the model determine the maximum current that can be conducted through the two products. The two products are called field exciters. LÄS MER

  5. 4. Experimental Investigation of Added Mass and Damping on a Model Kaplan Turbine for Rotor Dynamic Analysis

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

    Författare :Timmy Nyman; [2018]
    Nyckelord :Added mass; added damping; rotor dynamics; kaplan turbine; vibrations; fluid dynamics;

    Sammanfattning : The concept of added hydrodynamic properties such as added mass is of importance in modern hydropower development, mainly for rotor dynamic calculations. Added mass could result in reduced natural frequencies and altered mode compared to existing simulation models. LÄS MER

  7. 5. Construction, testing and verification of a brushless excitation system with wireless control of the field current in a synchronous generator.

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Elektricitetslära

    Författare :Rickard Larsson; Kenny Andersson; [2018]
    Nyckelord :Brushless excitation; synchronous generator; bluetooth; torque ripple; Borstlös matning; synkrongenerator; blåtand; momentpulsationer;

    Sammanfattning : Synchronous generators have been used in hydropower from more than a century where, traditionally, the field current is transferred to the rotor using slip rings and carbon brushes. There are some major disadvantages following the use static excitation; regular and expensive maintenance, as well as a source of carbon dust which, due to buildup, may cause short circuits. LÄS MER