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 92 for “"dc/ac"”.
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Small signal control of multiterminal dc/ac power systems
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1981.
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High efficiency DC/AC power converter for photovoltaic applications
… for conversion from low-voltage (25-40V) DC to high voltage AC (e.g. 240VAC,RMS). The circuit topology is based on a full-bridge series resonant inverter, a high-frequency transformer, and a novel half-wave cyclo-converter. The operational characteristics are analyzed, and a …
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Current source dc-dc and dc-ac converters with continuous energy flow
… source inverters that evolve from the basic dc-dc converter topologies. The switched, large-signal, and small-signal models of these converters are presented, and used to develop control strategies for the proposed differential-mode inverters, considering their inversion and rectification …
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A Soft-Switched Grid-Connected DC/AC Inverter with Low Current Ripple
… the utility grid infrastructure is based on AC, DC/AC inverters are commonly used in renewable energy harvesting systems as the interface to the utility grid. The focus of this thesis is on the design and development of highly-efficient DC/AC inverters for future energy systems. Typically, …
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Control Design of a Single-Phase DC/AC Inverter for PV Applications
… energy market continues to rapidly grow. Some background research has been done on solar energy, PV inverter configurations, inverter control design, and hardware component selection. Controllers are designed both for stand-alone and grid-connected modes of operation. For stand-alone inverter …
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High-Frequency Quasi-Single-Stage (QSS) Isolated AC-DC and DC-AC Power Conversion
… (QSS) power conversion topology for ac-dc rectification and dc-ac inversion is proposed. The topology is reached by direct cascading and synchronized switching of two variety of buck or two variety of boost switching networks. The family of QSS power converters feature single-stage …
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Soft-switched, active-clamped DC/AC and AC/AC converters for IPT-based wireless charging applications
The acquisition of inductive power transfer (IPT) technology in commercial electric vehicles (EVs) alleviates the inherent burdens of high cost, limited driving range, and long charging time. In EV wireless charging systems using IPT technology, power electronic converters play a vital role to …
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Analysis and design of power electronic cell for modular power electronic systems: DC-AC converter configurations
… a basic power electronic cell and its different DC-AC configuration. It presents a solution for synchronization and circulating current problem for parallel connected cells. It extends this idea to full bridge and three phase configuration.
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Zero Voltage Switching (ZVS) Turn-on Triangular Current Mode (TCM) Control for AC/DC and DC/AC Converters
… inverters needs to be reduced so as to make space for more parts in these vehicles. Electromagnetic Interference (EMI) filters take up a more than 80 % of these power converters, the size of these filters can be reduced by pushing the switching frequency higher. High frequency operation (> 300 …
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Toward high-efficiency high power density single-phase DC-AC and AC-DC power conversion - architecture, topology and control
Power conversion between the single-phase AC grid and DC sources or loads plays an indispensable role in modern electrical energy system for both generation and consumption. The renewable resources and electrical energy storage are integrated to the grid through inverters. Telecoms, data centers …
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Power Density Optimization of SiC-based DC/AC Converter for High-Speed Electric Machine in More/All-electric Aircraft
… or all electric aircraft urgently necessitates dc/ac converter systems with high power density. Silicon Carbide (SiC) devices, known for their superior performance over traditional silicon-based devices, facilitate this increase in power density. Nonetheless, achieving optimal power density …
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Comparison and Design of High Efficiency Microinverters for Photovoltaic Applications
… due to recent developments in PV panel manufacturing that decreases material costs and improves energy harvesting efficiency. Since PV sources are DC sources power conversion stages have to be used in order to interface this power to the existing electrical utility system. The structure of …
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Single-Stage Wireless Power Transfer System with Single-Switch Secondary Side Modulation
… nature and separated primary/secondary side, achieving tight load regulation or implementing closed-loop control of output voltage/current is nontrivial in a wireless power transfer (WPT) system. Previously presented methods for regulating or controlling the output of a WPT system include …
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Analysis and design of a high frequency induction-heating system
… to 200kHz. The system essentially comprises a DC-DC converter configured as a controlled current source, which feeds a load resonant DC-AC inverter, driving a parallel resonant load circuit. The load circuit comprises an induction-heating coil and a reactive power compensating capacitor. The …
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Soft-switching techniques for high-power PWM converters
… high power PWM converters. These new topologies achieve soft-switching functions with minimum increase of device voltage/current stresses and converter circulating energy, and thus have advantages over conventional techniques in efficiency, power density, reliability, and cost of power …
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Optimal vertical plane booster guidance including pitch dynamics
… high power PWM converters. These new topologies achieve soft-switching functions with minimum increase of device voltage/current stresses and converter circulating energy, and thus have advantages over conventional techniques in efficiency, power density, reliability, and cost of power …
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Facilitating seamless transitions in flexible microgrids: A unified control systems framework for enabling multi-mode inverters
… and operation modes for the comprising DC/AC inverters, particularly in the primary control layer. This approach hinders the true potential of flexible microgrids to dynamically respond to changing generation and consumption profiles, grid faults, and contingency events. This …
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Ferrofluid dynamics in a Hele-Shaw cell simultaneously stressed by DC and rotating magnetic fields
… repeated to evaluate magnetic fluid behavior in DC, AC and rotating magnetic fields. Understanding these behaviors are essential to the ferrohydrodynamic applications of ferrofluids in biomedicine. Careful measurements in Hele-Shaw cells with simultaneous perpendicular DC and in-plane rotating …
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Modeling and simulation of selected distributed generation sources and their assessment
… as dynamic. Also, the detailed synchronous machine and the excitation system model are obtained for the standard simulation. The simulation will be performed with an infinite bus system model. The synchronous machine is connected with a local load in order to develop the terminal voltage, …
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Observer-based fault detection and isolation for motor drive inverters
Abstract Observer-based methods can be used for fault detection and isolation for switched linear systems. A state observer is constructed based on the physical system. Changes in the observer error are monitored to detect specific types of faults. This thesis uses the mathematical basis to offer a …
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