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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 30 for “"power conversion system"”.
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High Power High Frequency 3-level NPC Power Conversion System
… energy and the emerging concept of micro-grid system raises challenges to the high power conversion techniques. Multilevel converter plays the key role in such applications and is studied in detail in the dissertation. The topologies and modulation techniques for multilevel converter are …
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Risk Analysis of a BWR Power Conversion System; Clinton Power Station
Made available in DSpace on 2017-07-06T18:55:11Z (GMT). No. of bitstreams: 2 Lundell_Karen_P_MS.pdf: 75358767 bytes, checksum: 79c39df654f620a010b8065f8d7ae04b (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1983
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Analysis of required supporting systems for the supercritical CO₂ power conversion system
… cycles. An additional benefit of the S-CO₂ system is its universal applicability as an indirect secondary Power Conversion System (PCS) coupled to most GEN-IV concept reactors, as well as fusion reactors. The United States DOE's GNEP is now focusing on the liquid Na cooled primary as an …
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Evaluation of ethane as a power conversion system working fluid for fast reactors
A supercritical ethane working fluid Brayton power conversion system is evaluated as an alternative to carbon dioxide. The HSC® chemical kinetics code was used to study thermal dissociation and chemical interactions for ethane and other coolants under a variety of conditions. The NIST database was …
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Power conversion system design for supercritical carbon dioxide cooled indirect cycle nuclear reactors
… dioxide (S-CO₂) cycle is a promising advanced power conversion cycle which couples nicely to many Generation IV nuclear reactors. This work investigates the power conversion system design and proposes several "Third Generation" plant layouts for power ratings ranging between 20 and 1200 MWe for …
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Design, analysis and optimization of the power conversion system for the Modular Pebble Bed Reactor System
The Modular Pebble Bed Reactor system (MPBR) requires a gas turbine cycle (Brayton cycle) as the power conversion system for it to achieve economic competitiveness as a GenIV nuclear system. The availability of controllable helium turbomachinery and compact heat exchangers are thus the critical …
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Design of a 2400MW liquid-salt cooled flexible conversion ratio reactor
A 2400MWth liquid-salt cooled flexible conversion ratio reactor was designed, utilizing the ternary chloride salt NaCl-KCl-MgCI2 (30%-20%-50%) as coolant. The reference design uses a wire-wrapped, hex lattice core, and is able to achieve a core power density of 130 kW/1 with a core pressure drop of …
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Hydrogen production using a supercritical CO₂-cooled fast reactor and steam electrolysis
… which ameliorate materials problems, and reduced power conversion system costs. High temperature steam electrolysis can be performed at conditions of 8500C and atmospheric pressure. However, compression of the hydrogen for pumping through pipes is unnecessary if electrolysis takes place at around …
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Development and application of a steady state code for supercritical carbon dioxide cycles
The supercritical CO2 power conversion system is of interest for advanced nuclear reactor applications because the same efficiencies are obtained as for the most developed of the closed gas-turbine cycles (helium-Brayton), but at lower temperatures and higher pressures. The original in-house code, …
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A low ripple bi-directional battery charger/discharger using coupled inductor
There are two important issues about a spacecraft power conversion system: low ripple current flowing through both battery and bus, and bi-directional power flow to and from the battery. This thesis introduces a novel low ripple current bi-directional battery charge/discharge converter using …
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Flexible system development strategies for the Chuo Shinkansen Maglev Project : dealing with uncertain demand and R&D outcomes
… Because each Maglev train requires a dedicated Power Conversion System (PCS) but a different one as it moves along the route, it is required to estimate the future demand accurately to determine the number of PCSs to construct. At the same time, the R&D to advance the technologies of PCS has the …
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Adaptive Control of a Step-Up Full-Bridge DC-DC Converter for Variable Low Input Voltage Applications
… is designed to operate as a front stage of a power conversion system where the input is a variable low voltage high current source. The converter is designed to step-up the low voltage input to an acceptable level that can be inverted to a 120/240 VAC 60Hz voltage for residential power. A DSP …
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Two-dimensional photonic crystals as selective emitters for thermophotovoltaic power conversion applications
… in combustion-driven thermophotovoltaic (TPV) systems intended as auxiliary power systems in automobiles. A TPV power conversion system functions on the principle of direct conversion of thermal radiation into electricity. A basic TPV system consists of an emitter and a photovoltaic (PV) diode. …
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Dynamic response of the supercritical C0₂ Brayton recompression cycle to various system transients
The supercritical carbon dioxide (SC0₂) power conversion system has been suggested for use with many of the Generation IV nuclear reactors. The SC0₂ cycle is highly attractive because of its low operating temperatures and high efficiency associated with working near the critical point of CO2. …
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Thermal hydraulic design and analysis of a large lead-cooled reactor with flexible conversion ratio
This thesis contributes to the Flexible Conversion Ratio Fast Reactor Systems Evaluation Project, a part of the Nuclear Cycle Technology and Policy Program funded by the Department of Energy through the Nuclear Energy Research Initiative. The goal of this project is to develop conceptual designs of …
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New Techniques in the Design of Distributed Power Systems
Power conversion system design issues are expanding their role in information technology equipment design philosophies. These issues include not only improving power conversion efficiency, but also increased concerns regarding the cost and complexity of the power conversion design techniques …
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Weight Estimation of Electronic Power Conversion Systems
Electronic power conversion systems with large number of power converters have a variety of applications, such as data center, electric vehicles and future smart "nanogrid" in residential home. Those systems could have very different architectures. For example, one system could be based on ac, dc …
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Modular Photovoltaic (PV) Step-up Converter With A Coupled Power Balancing Scheme for DC-Distributed System
… global energy capacity for renewable energy systems has been increasing exponentially, with photovoltaic (PV) energy having 25% growth rates along with a continual decrease in cost. A high-power PV energy conversion system typically consists of a medium voltage (MV) grid that collects power …
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Development of thermodynamic cycles for sodium-cooled-fast reactors.
… is designing Generation IV (GEN-IV) Nuclear Power Plants (NPPs) with significantly higher thermal efficiencies compared to current NPPs, and to match, or at least to be close to, the thermal efficiencies reached by fossil-fired power plants, which are currently at the level of 40-62%. As …
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Nuclear Electric Propulsion with Low Enriched Uranium
… used monopropellant or fuel-oxidiser propulsion systems to provide the required delta-v for orbital transfers and other in-space manoeuvres. Electric propulsion offers an alternative means of providing thrust that makes much more economical use of propellant due to its very high specific impulse. …
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