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 17 of 17 for “"Small Signal Modeling"”.
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Accurate Small-Signal Modeling for Resonant Converters
… at a premium. However, the lack of an accurate small-signal model has become an impediment to performance optimization. Many modeling attempts have been made to date. Besides the discrete time-domain modeling, most continuous-time modeling approaches are based on fundamental approximation, and …
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Small-Signal Modeling and Stability Specification of a Hybrid Propulsion System for Aircrafts
This work utilizes the small-signal impedance-based stability analysis method to develop stability assessment criteria for a single-aisle turboelectric aircraft with aft boundary-layer propulsion (STARC-ABL) system. The impedance-based stability analysis method outperforms other stability analysis …
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Extended describing function method for small-signal modeling of resonant and multi-resonant converters
… function method is proposed as a systematic small-signal modeling approach to nonlinear switching circuits. This method offers significant simplification upon the previous work on using the multi-variable describing functions to treat the circuit nonlinearities. As an extension to the …
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A Non-isolated Half Bridge Buck-based Converter For Vrm Application And Small Signal Modeling Of A Non-conventional Two Phase Bu
… larger molecules (>1000 dalton) and produce smaller molecules, as indicated by an increase in smaller molecule contribution to organic carbon. In part two, effects of Fenton's reagent treatment on biodegradability of three landfill leachates collected from a Florida landfill were evaluated …
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Analysis, simulation and modeling of three-level VSIs
… is done by computer simulation. Comprehensive small-signal modeling of the three-level converter with a resistive load is developed the first time. Steady-state solutions reveal that the voltage across dc-link input capacitors is constant at the half of the dc-link voltage.
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Modeling and control of zero-voltage transition three-phase PWM boost rectifier
Average and small signal modeling of zero-voltage transition three-phase boost rectifier is performed. The effect of ZVT is introduced in the existing model for the three-phase boost rectifier using the time-averaging equivalent circuit approach. The small signal model is derived from the average …
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Modeling and Implementation of Controller for Switched Reluctance Motor With Ac Small Signal Model
… nature of the SRM. In this thesis, the ac small signal modeling technique is proposed for linearization of the SRM model such that a conventional PI controller can be designed accordingly for the PWM current controller. With the linearized SRM model, the duty-cycle to output transfer …
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Renewable electric power systems energy yield and performance estimation
… SHS. We also present applications to stochastic small-signal modeling of power systems. Case studies demonstrate how to quantify the impact of renewable resources uncertainty on power system dynamics.
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GaN heterojunction FET device Fabrication, Characterization and Modeling
… efforts to develop the growth, processing, and modeling technologies for GaN-based Heterojunction Field Effect Transistors (HFETs). The interest in investigating GaN HFETs is motivated by the advantageous material properties of nitride semiconductor such as large band gap, large breakdown …
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Resonant Cross-Commutated Dc-Dc Regulators with Omni-Coupled Inductors
… achieved 2.1% higher efficiency and 50% smaller total magnetic volume than the commercial inductors in the same rccBuck converter. The Omni-coupled inductors (OCI), composed of a twisted E-E core and PCB windings, further improve power density and efficiency. The core loss and inductances …
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DQ-Frame Small-Signal Stability Analysis of AC Systems with Single-Phase and Three-Phase Converters
… This dissertation presents a novel approach to modeling and comprehensive stability analysis for both single-phase and three-phase converters, addressing vital gaps in the existing literature. The first part of the dissertation (Chapters 2 to 4) focuses on single-phase power supply units, …
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Advanced Modeling, Control and EMI Mitigation Techniques for Switching DC-DC Power Converters
L'abstract è presente nell'allegato / the abstract is in the attachment
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Design and Analysis of a Small-Scale Wind Energy Conversion System
… aims to present detailed analysis of the small scale wind energy conversion system (WECS) design and implementation. The dissertation will focus on implementing a hardware prototype to be used for testing different control strategies applied to small scale WECSs. Novel control algorithms …
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Chemical And Biological Treatment Of Mature Landfill Leachate
… output voltage is needed. This decrease causes small duty cycle that is accompanied by critical problems which impairs the efficiency. Therefore, these problems need to be addressed. Transformer-based non-isolated topologies are not new approaches to extend the duty cycle and avoid the …
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Modeling and Stability Analysis for Multiphase Constant On-Time Control With Phase Overlapping
… loads must regulate output voltage within a small tolerance window and handle a large steady-state current. For output voltage regulation, multiphase current-mode and V² constant on-time (COT) control techniques are widely used because these control methods can help increase control …
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Aportaciones al modelado de lámparas fluorescentes para aplicaciones en alta frecuencia con regulación de flujo luminoso
… work aims to make some contributions to the modeling of fluorescent lamps for high frequency dimming applications. It pursues to obtain new models that provide more accurate description of lamp behavior, also taking into account the power level and ambient temperature. Based on these …
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Small Signal Equivalent Circuit Extraction From A Gallium Arsenide MESFET Device
… the need to model them. This thesis extracts a small signal equivalent circuit model from a Gallium Arsenide MESFET device. The approach taken in this thesis is to use measured S- parameters to extract a small signal equivalent circuit model by optimization. Small signal models and S-parameters …