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  • Rapid bidirectional power flow of supercapacitor bank energy storage through grid-tied inverters for improved renewables integration

    Creator:
    Bostrom, Arne
    Abstract:
    The variable output of renewables such as wind and solar causes fluctuations of power flow that can adversely affect power system operation, especially at high levels of penetration. The coordination of multiple energy storage solutions can mitigate integration challenges by providing a buffer from variable renewables. This thesis presents the...
    Resource Type:
    Masters Thesis
    Full Text:
    the integration of supercapacitor energy storage through a grid-tied inverter system that can then

  • Voltage analysis of PWM inverter fed induction motors

    Creator:
    Al-Ghubari, Fahad H.
    Abstract:
    Adjustable Speed Drive (ASD) systems are widely used in industry to effectively improve process efficiency and control. Typically, an ASD system consists of a motor with its speed controlled by a power electronics converter via varying the amplitude and frequency of the input voltage. However, several abnormal insulation failures of...
    Resource Type:
    Masters Thesis
    Full Text:
    Voltage analysis of PWM inverter fed induction motors AN

  • OP-AMP free SC biquad LPF and delta-sigma ADC

    Creator:
    Yoo, Kiseok
    Abstract:
    The objective of this work is to explore the feasibility of replacing conventional op-amps with inverters in switched-capacitor (SC) circuits. In order to verify the idea, a low-pass filter (LPF) and a second-order delta-sigma (∆Σ) analog-todigital converter (ADC) are designed in the 0.5-m CMOS technology. The low-pass filter structure is...
    Resource Type:
    Masters Thesis
    Full Text:
    ....................................................................................... 6 2.3. Biquad LPF Based on Inverter

  • Low Frequency Oscillation Reduction Algorithm for Six-step Operation of Three-Phase Inverters

    Creator:
    Ke, Ziwei
    Abstract:
    A power inverter, or inverter, is an electronic device or circuitry that converts direct currents (DC) to alternating currents (AC) in the power electronics family. A three-phase inverter converts DC current to three-phase AC current. Inverters, especially three-phase inverters, have been widely used in many fields including renewable energy applications...
    Resource Type:
    Masters Thesis
    Full Text:
    Abstract approved: Julia Zhang A power inverter, or inverter, is an electronic device or circuitry that

  • A motor-generator and supercapacitor based system for microgrid frequency stabilization

    Creator:
    Crispo, Richard F.
    Abstract:
    This research introduces an energy storage system to deliver microgrid frequency response. A doubly-fed induction generator (DFIG) and a squirrel cage induction machine (SCIM) are coupled together as a motor/generator set to deliver an immediate inertial response to a change of frequency, and an inverter and supercapacitors deliver short term...
    Resource Type:
    Masters Thesis
    Full Text:
    frequency, and an inverter and supercapacitors deliver short term power. The hardware results show the

  • Amorphous oxide semiconductor thin-film transistor ring oscillators and material assessment

    Creator:
    Sundholm, Eric Steven
    Abstract:
    Amorphous oxide semiconductor (AOS) thin-film transistors (TFTs) constitute the central theme of this thesis. Within this theme, three primary areas of focus are pursued. The first focus is the realization of a transparent three-stage ring oscillator with buffered output and an output frequency in the megahertz range. This leads to...
    Resource Type:
    Masters Thesis
    Full Text:
    capacitor’s log(J)-ξ curve, where J is the measured current density and ξ is the applied electric field. An