Essays about: "rotor oscillations"

Found 5 essays containing the words rotor oscillations.

  1. 1. Performance analysis of a small-scalewind turbine at variable pitch and withpitch unbalance

    University essay from KTH/Strömningsmekanik och Teknisk Akustik

    Author : Francesco Mazzeo; [2021]
    Keywords : Wind energy; wind turbine; pitch angle; pitch unbalance; Blade Element Momentum BEM theory; Computational Fluid Dynamics CFD ; wind tunnel experiments; oscillations;

    Abstract : When it comes to design a wind turbine rotor, several parameters have to be taken into account. The present work focuses on the inclination of the blades with respect to the rotor plane, namely the pich angle. READ MORE

  3. 2. Excitation system – simulation, tuning and evaluation

    University essay from Uppsala universitet/Elektricitetslära

    Author : Philip von Heideken; [2021]
    Keywords : ;

    Abstract : Swedish Electrical and Power Control AB (Svea Power) offers excitation systems for electrical production plants. An excitation system controls the electrical performance of the generator’s three phase outputs and must meet requirements set out in the business agency “Svenska Kraftnäts (SvK:s) föreskrifter, SvKFS 2005:2”. READ MORE

  4. 3. The Dissipating Energy Flow method for analysing generator contribution to power system damping -- evaluation and interpretation

    University essay from Lunds universitet/Industriell elektroteknik och automation

    Author : Hampus Möller; [2019]
    Keywords : Electromechanical oscillations; small-signal stability; energy flow; PMU measurements; forced oscillations; dissipating energy.; Technology and Engineering;

    Abstract : Electromechanical oscillations is a power system phenomenon where generator rotors oscillate, leading to oscillatory power flows. Damping of such oscillations is important for system stability. Forced oscillations is a special case where one faulty component is the source of the oscillation. READ MORE

  5. 4. Field Current Control for the Damping of Rotor Oscillations and for the Alternative Start of Synchronous Machines : Further Innovative Applications of Field Current Active Control besides UMP-Compensation

    University essay from Uppsala universitet/Institutionen för teknikvetenskaper

    Author : Roberto Felicetti; [2018]
    Keywords : asynchronous start; current control; damping bars; damper winding; d-axis; q-axis; hunting; natural frequency; Park s reference frame; rotor back-EMF; rotor oscillations; synchronous motor;

    Abstract : The possibility to save energy in synchronous machines operation by dismissing d-axis damping bars and surrogating them with active excitation current control in sectored field winding is proved. In particular a way to recover the energy of rotor oscillations during power regulation is shown by means of a studycase generator whereas a self-starting machine is analytically and numerically designed in view of its next construction and test. READ MORE

  6. 5. Active Damping of Subsynchronous Resonance

    University essay from Lunds universitet/Institutionen för reglerteknik

    Author : Erik Gustafson; [1994]
    Keywords : Technology and Engineering;

    Abstract : This report deals with the damping of sub-synchronous oscillations in power systems. The method is based on estimation of the generator rotor angle and shaft speed, by measuring the line current and the voltage across a phase-compensating series capacitor. READ MORE