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.
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Showing 1 to 20 of 63 for “"Total Harmonic Distortion"”.
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Analysis and Comparison of Space Vector Modulation Schemes for Three-Leg and Four-Leg Voltage Source Inverters
… with respect to a) switching losses, b) total harmonic distortion, c) peak-to-peak ripple in the line current and d) the ease of digital implementation. The analysis is performed over the entire range of modulation index and for varying load power factors (leading and lagging) under both …
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Power Quality Analysis of a Three-Phase Cycloconverter Under Variable Operating Conditions
… of interest are power 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 …
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A Novel Arc Welding Power Supply with Improved Power Factor Correction
… power factor to near unity and reducing total harmonic distortion. State space analysis of the proposed circuit showed that the circuit followed a boost-buck input output relationship. Simulation of the circuit was first implemented in LTspice to verify the functionality of the new …
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Single-switch three-phase zero-current-transition rectifier with power factor correction
… 50 kHz, experimental ZCT rectifier with an IGBT; total harmonic distortion below 9% and efficiency above 95% were obtained.
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An improved electronic ballast for the fluorescent lamps
… devices at light load conditions, the high total harmonic distortion (THO) of the line current, and the poor crest factor ( CF) of the lamp current in this circuit make it difficult to manufacture this circuit into a cost-effective ballast product. This thesis analyzes the problems …
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Microcontroller Design of a Bidirectional Three-Level Pulse Width Modulation AC/DC Converter for Vehicle-to-Grid Application
… simulations show the design provides lower total harmonic distortion (THD) and reduced stress to the charger’s components making it a viable charger design for the electric vehicle industry.</p>
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Design of rectifier power supplies for Thermal Energy Storage System
… techniques, based on their power factor (PF) and total harmonic distortion (THD). Finally, direct output voltage control and cascaded current voltage control are implemented and compared.
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Efficient, low-distortion switch-mode power amplifier for amplitude modulation
… two goals of power amplifier design are low-distortion and high-efficiency. To meet these goals, a unique switch-mode power amplifier intended for amplitude modulation which utilizes spectral content at the carrier frequency is designed, simulated, and built. Theoretical predictions of total …
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Controlling the Vienna rectifier using a simplified space vector pulse width modulation technique
… burden, the switching 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 …
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Design and Analysis of a Novel Multilevel Single Phase Interconnected H-bridge Inverter
… of a custom filter to optimize the output total harmonic distortion (THD). Results from measurements done in simulation and hardware demonstrate the functionality of the proposed inverter topology, providing quality outputs at no load condition. The thesis will also identify and offer …
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Design and modeling of a power conditioning system for the hybrid fuel-cell/turbine power plant.
… The LCL filter can greatly 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%, …
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Harmonic elimination by switching angle optimization technique for multilevel inverter
The needs for a free harmonic and high rating power source is increased to meet the required industry applications. In this project, a 7-level Cascaded H-Bridge Multilevel Inverter (CHBMLI) with two various controllers are presented. Proportional Integral (PI) and Artificial Neural Network (ANN) …
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Increasing the Dynamic Range of Audio THD Measurements Using a Novel Noise and Distortion Canceling Methodology
… how a new experimental methodology 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 …
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Comparison Between PWM and SVPWM Three-Phase Inverters in Industrial Applications
… sinusoidal waves. SVPWM 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 …
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A Compact Low Power Bio-Signal Amplifier with Extended Linear Operation Range
… linear operation range from 0.3 V to 3.08 V. The total harmonic distortion (THD) is 0.04% with power consumption of 18.5 ¿¿W and a core area of 0.063 mm^2.
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Single phase trapezoidal AC power supplies for hybrid fiber/coax networks
… such as input power factor, input current total harmonic distortion and efficiency. Experimental results on a laboratory prototype confirm the feasibility of the proposed power supply.
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Design analysis of potential grid connected floating photovoltaic system in UTHM
… within the campus premises covering a total area of more than 50,000 m2. A 4000 m2 located at the lake near faculty of technical and vocational education (FPTV) is considered of the total available area for the feasibility study. A total of 1372.6 kW can be generated by deploying 335W …
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Analysis of microgrid with renewable generation and energy storage system
… controllers for the MG to reduce the amount of total harmonic distortion (THD) at PCC is conducted. Dynamic testing of MG is also conducted under various loading conditions, encompassing small-, medium-, and large-signal changes. The results prove that the PCC voltages are effectively kept …
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Analog Single Sideband-Pulse Width Modulation Processor for Parametric Acoustic Arrays
… In simulation, a single tone test shows higher total harmonic distortion for lower frequencies and higher modulation depth. A two-tone test creates a 2<sup>nd</sup> order intermodulation term that increases with the frequencies of the input signals.</p>
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Towards High Efficiency and High Power Density Converter: System Level Design, Modulation, and Active EMI Filters
… (TNPC) inverters has higher efficiency and lower total harmonic distortion (THD) compared to two-level inverter. Hybrid switch concept combines the benefit of both silicon carbide (SiC) MOSFET and Si IGBT. By applying hybrid switch structure in 3-L T-type inverter, the total power density of 3-L …
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