NDLTD logo NDLTD Union Catalog and Global ETD Search

Global ETD Search

Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.

Results

Showing 1 to 20 of 82 for “"THD"”.

  1. The THD performance of single phase five level inverter using pr and harmonic compensators current controller

    Abdullahi, Abdullahi MohamedUniversiti Tun Hussein Onn Malaysia2020

    … output. This project is to observe the THD performance of single phase five level inverter using proportional resonant (PR) and harmonic compensators current controller. The PR controller not only solve the current and harmonic problem, but also efficiency and accuracy of equipment in …

    uthm Repository record

  2. Increasing the Dynamic Range of Audio THD Measurements Using a Novel Noise and Distortion Canceling Methodology

    Dunipace, Richard AlanUniversity of North Texas2003

    … for measuring Total-Harmonic-Distortion (THD) of operational amplifiers functioned when compared with two standard methodologies, and whether the new methodology offers any improvement in noise floor and dynamic range along with distortion canceling of the sine-wave source used in the …

    unt Repository record

  3. Synthesis and characterization of precursors for chemical vapor deposition of metal oxide thin films

    Nyman, MayVirginia Tech1992

    … CVD process. Lead bis-tetramethylheptadione [Pb(thd)₂], lead bis-heptafluorodimethyloctadione [Pb(fod)₂], and zirconium tetrakis-tetramethylheptadione [Zr(thd)₄], which are lead and zirconium precursors for CVD of Pb(Zr<sub>x</sub>Ti<sub>1-x</sub>)O₃ thin films, and T8- hydridospherosiloxane, …

    vt Repository record

  4. Mechanisms of Methanogenic Inhibition in Advanced Anaerobic Digestion

    Wilson, Christopher AllenVirginia Tech2009

    … of thermally pretreated wastewater sludge (THD) were carried out. Enhanced digestion performance in terms of solids destruction and methane generation by THD relative to MAD was achieved, and was largely attributable to the solubilization and subsequent biodegradation of energy-rich …

    vt Repository record

  5. Symmetric and asymmetric multilevel inverter topologies with reduced number of switching devices structure for high power density achievement

    Yatim, Mohd HafizieUniversiti Tun Hussein Onn Malaysia2019

    … in order to reduce total harmonic distortion (THD). In contrast, the number of switching devices need to be increased in symmetric multilevel inverter (SMLI) topology and cascaded H-bridge (CHB) structure when higher output voltage level is considered. A 5-level RNSD structure is proposed as a …

    uthm Repository record

  6. LLC Resonant Converter Based Single-stage Inverter with Multi-resonant Branches

    Jiao, DongVirginia Tech2022

    … enlarges the gain range which improves output THD and reduces the switching frequency range. A 1.2 kW prototype is built to demonstrate the performance of the proposed inverter. Zero-voltage-switching (ZVS) and zero-current-switching (ZCS) are achieved on the primary side and secondary side, …

    vt Repository record

  7. Harmonic elimination by switching angle optimization technique for multilevel inverter

    Altayib Sahhouk, Masoud AlbasheerUniversiti Tun Hussein Onn Malaysia2019

    … and a low level of total harmonic distortion (THD). A pulse width modulation generators have been connected to switching devices of 7-level CHBMLI. The reference waveform for pulse width modulation (PWM) generator is considered to be a sinusoidal wave to obtain ideal AC output voltage waveform …

    uthm Repository record

  8. The membrane lipid composition regulates talin mediated integrin activation

    Ye, XinUniversity of Illinois at Urbana-Champaign2017

    … show that recruitment of talin head domain (THD) to the membrane surface is governed by electrostatics in the absence of other adapter proteins. In addition, distance measurements reveal that anionic lipids stimulate a conformational change in the talin head domain allowing interaction of the …

    uiuc Repository record

  9. AC Direct Drive LED Lighting Using Low Cost Analog Components

    Head, Miles2019

    … at the cost of increased input current THD. This project found that this conclusion is physically realizable, with a final efficiency of 94.46% and an input current THD of 58.9%. This result was achieved by taking the previous investigation’s final design as a starting point and …

    calpoly Repository record

  10. Efficient, low-distortion switch-mode power amplifier for amplitude modulation

    Buenrostro, Christopher (Christopher B.)Massachusetts Institute of Technology2011

    … predictions of total harmonic distortion (THD) and efficiency are made, and the constructed prototype results are measured. The THD for a 1 kHz modulating tone is predicted to be 0.9% and measured to be 4.15% worst case. The amplifier output stage efficiency is predicted to be 95.8% and …

    mit Repository record

  11. Controlling the Vienna rectifier using a simplified space vector pulse width modulation technique

    Sunbul, AliUniversity of Ontario Institute of Technology2019

    … losses and the Total-Harmonic-Distortion (THD). Furthermore, the robustness of this modulation technique is tested under various faults through a 70 kW MATLAB/Simulink model and the results are validated through 1.2 kW prototype. The results reveal that the simplified SVPWM provides a low …

    uoit Repository record

  12. Power Quality Analysis of a Three-Phase Cycloconverter Under Variable Operating Conditions

    Palani, Kevin2010

    … factor, input current total harmonic distortion (THD), output voltage THD, and efficiency. The scope of the project includes analytical calculations, PSpice simulations, as well as a hardware implementation. The results show that output frequency has minimal effect on power quality. High input …

    calpoly Repository record

  13. Design and modeling of a power conditioning system for the hybrid fuel-cell/turbine power plant.

    Guo, Zhitong, 1987-Baylor University.2011

    … reduce the current total harmonic distortion (THD). Theoretical analysis and modeling methodologies are presented. Simulation results validate the proposed system and demonstrate that the proposed PCS can follow a dynamic load and reduce the current THD to 1.65%, which is much lower than IEEE …

    baylor Repository record

  14. Analýza a implementace metod pro měření charakteristik lineárních a nelineárních systémů

    Tichá, JarmilaVysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií

    … hodnotu celkového harmonického zkreslení THD. Aplikace umožňuje měřit externí zvuková zařízení připojená pomocí ASIO zvukového rozhraní.

    brno-tech Repository record

  15. Comparison Between PWM and SVPWM Three-Phase Inverters in Industrial Applications

    Nusair, Ibrahim RakadYoungstown State University2012

    … proved to have less total harmonic distortion (THD% = 1.15%) and faster response time (114ms) with an output error of 0.13V. this compares with a sinusoidal PWM (THD% = 3.73%, response time = 136ms and output error = 0.23V). SVPWM proves to have better overall performance.</p><p>MATLAB’s …

    ohiolink Repository record

  16. The ecology and feeding biology of thecate heterotrophic dinoflagellates

    Jacobson, Dean M.Massachusetts Institute of Technology and Woods Hole Oceanographic Institution1987

    A group of thecate heterotrophic dinoflagellates (THDs), principally in the diverse and ubiquitous genus Protoperidinium, was investigated both from an ecological and an organismal perspective. When this study was initiated, nothing was known about their feeding mechanisms, rates or food …

    woods-hole Repository record

  17. A Distortion Suppression Technique for a Digital Class D Audio Power Amplifier with Pulse Density Modulation

    McKenzie, Robert Neil2022

    … Width Modulation (PWM) can provide over 100 dB THD at a switching rate well below 1 MHz, but can generate large EMI spikes at the switching frequency and harmonics. Many techniques have been developed to reduce this problem, such as spread spectrum switching and adaptive gate drive. Pulse …

    toronto-retro Repository record

  18. Implementation of a 100kW Soft-Switched DC Bus Regulator Based on Power Electronics Building Block Concept

    Wu, JiaVirginia Tech2000

    … further remove the associated loss while keeping THD low. Reduced switching events alleviate the thermal issue of the resonant capacitors. The same modulation technique can avoid the low-frequency harmonics caused by the pulse width limits and double the sampling frequency. The phase current …

    vt Repository record

  19. PWM Techniques for Control of Dual-Inverter Supplied Six-Phase Drives

    Patkar, FLiverpool John Moores University2013

    … in term of total harmonic distortion (THD) of phase voltage is obtained when the reference is shared unequally between the two modulators. The second technique is carrier-based modulation where the modulation of the two inverters is determined by the disposition of the carrier signals. …

    liverpool-jm Repository record

  20. Control of Harmonics in 6-Pulse Rectifiers

    Pyakuryal, Sudeep K.2001

    … be under 3% and the total harmonic distortion, THD, to be under 5% of the fundamental component.</p> <p>Harmonic distortion can be mitigated using different methods. Based on the system configuration either active filters, passive filters, or phase shifting methods are used. In medium voltage …

    denver Repository record

Page 1 of 5