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 24 for “"circulating current"”.
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High-frequency, slotless permanent magnet synchronous motor for aircraft propulsion
… structure contributes to the increase in circulating current in the armature coils. The aforementioned analytical model is used to predict the imbalance in back-EMF and thus the circulating current due to the manufacturing tolerances, and a low- field rotor is constructed to verify the …
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Study on Three-level DC/DC Converter with Coupled Inductors
… phased legs offer the benefit of output current ripple reduction, while inversed coupled inductors can suppress the circulating current between phase legs. Compared with conventional non-interleaving three-level DC/DC converter with non-coupling inductors, both inductor current ripple and …
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Controle preditivo com número reduzido de estados aplicado a conversor multinível modular
… been studied, especially in high voltage direct current transmission systems. Thus, this work describes the MMC converter model, considering both half and full-bridge submodules, associated with a model predictive control strategy, which considers a reduced number of states to control the power …
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Analysis and design of power electronic cell for modular power electronic systems: DC-AC converter configurations
… 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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Single-switch bridgeless PFC sepic with proposed series-line-diodes-clamped configuration for data communication applications
… several major drawbacks exist such as circulating current, capacitive coupling loop, more current stress at input capacitors and line-diodes, high total harmonic distortion of current (THDi), low power factor, dead zones, and high output voltage ripple. Therefore, a SSBPFC SEPIC …
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Zero-voltage switched resonant and PWM converters: design-oriented analysis and performance evaluation
… Efficiency optimization requires minimizing the circulating currents which are directly proportional to the reactive energy required by the resonant tank. The comparison of the different converters is based on the reactive energy required for ZVS. The study considers resonant converters with …
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Electroforming and electron emission in metal-borosilicate glass-metal structures
… theory of Dearnaley, the time dependence of the circulating current and electron emission may be explained. The theory is also supported by topographical studies 0 of the structures in a scanning electron microscope. The voltage breakdown strength in borosilicate glasses is found to be very high, …
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Analysis and Design of Paralleled Three-Phase Voltage Source Converters with Interleaving
… of paralleling VSCs by reducing system harmonic currents, which potentially can increase system power density. There are many challenges to implement interleaving in paralleled VSCs system due to the complicated relationships in a three-phase power converter system. In addition, to maximize the …
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Advanced Single-Stage Power Factor Correction Techniques
… power factor correction (VS-CPPFC) converters, current source CPPFC converters, combined voltage source current source (VSCS) CPPFC converters, and continuous input current (CIC) CPPFC converters. Integrated single-stage PFC converters are first developed, which combine the PFC converter with a …
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Circuits and Modulation Schemes to Achieve High Power-Density in SiC Grid-connected Converters
… three-phase converters. Due to limited current-capacity compared to the silicon insulated-gate bipolar transistors (Si-IGBTs), discrete SiC devices or SiC modules, operate in parallel to handle a large current. When three-phase inverters are paralleled, interleaving can be used, and …
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Control of Modular Multilevel Converters for Grid Integration of Full-Scale Wind Energy Conversion Systems
… appropriate control systems for control of circulating current and capacitor voltages under fixed- and variable-frequency operations are proposed. Using the developed MMC models, a gradient-based cosimulation algorithm to optimize the gains of the developed control systems, is proposed. …
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MOSFET-based MMC for low-voltage DC distribution networks
… voltage ratings, and elimination of reactive current and skin effect issues. LVDC distribution also complements the growth of power electronic loads having an implicit DC stage as part of their grid interface. However the DC-AC conversion stage at the customer end is one of the main challenges …
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Multiport Energy Router based Integration of Renewable Energy Sources for Offshore Grid
… by extending the ZVS range and minimizing the circulating current in the transformer windings. The TAB converter in MER is a multi-input multi-output (MIMO) system. The conventional PI controller for TAB utilizes a static decoupling matrix, which introduces potential operational challenges for …
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Power Management and Control Strategies in Hybrid AC/DC Microgrids
… accurate power-sharing but also suppresses the circulating current at the DC side.
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Design and development of a traction motor emulator using a three-phase bidirectional buck-boost AC-DC converter
… ten unidirectional IGBT switches preventing any circulating current in the system. The proposed converter also eliminates the regenerative converter stage in classical ME system. Also, the proposed common-DC-bus-configured ME system requires a single stage control unlike independent control in …
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Modeling and Control of Parallel Three-Phase PWM Converters
… voltage source inverters, buck rectifiers and current source inverters. The averaging of the parallel converters is performed based on a generic functional switching unit, which is called a phase leg in boost rectifiers and voltage source inverters, and a rail arm in buck rectifiers and current …
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Design of Extreme Efficiency Active Rectifier for More-electric Aircrafts
… with particular attention paid to the circulating current generated by interleaving operation. The design procedure for achieving maximum efficiency is described. Finally, a prototype of the proposed converter is constructed, which achieves 99.26% efficiency at nominal load.
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Design, Implementation, and Analysis for an Improved Multiple Inverter Microgrid System
… Those challenges, including much less over current capability, the nature of the intermittent renewable energy sources, a wide-band dynamic of generation units, and a large grid impedance variation, call for more careful system hardware and control designs to ensure a reliable system …
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Topology and Control Investigation of Soft-Switching DC-DC Converters for DC Transformer (DCX) Applications
… (ZVS) and a small root mean square (RMS) current, the open-loop CLLC resonant converter operating at the resonant frequency is a promising candidate for DCX with a constant voltage transfer ratio. In Chapter 2, to solve unsmooth bidirectional power flow and current distortion in the …
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Application of High-Power Snubberless Semiconductor Switches in High-Frequency PWM Converters
… the capacity to handle very high voltages and currents but lacked the ability to perform high frequency switching. Low-power converters, such as computer power supplies and low horsepower motor drives, have employed high-frequency switching for years and have benefited from very nice output …
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