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 169 for “"Power loss"”.
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In situ power-loss estimation of IGBT modules
… consists of collector-to-emitter measurement, power loss calculation, and thermal lifetime prediction model. The measurement circuit enables the estimation of power loss across a variety of IGBT modules with minimum impact on system reliability.
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Optimizing hysteretic power loss of magnetic ferrite nanoparticles
This thesis seeks to correlate hysteretic power loss of tertiary ferrite nanoparticles in alternating magnetic fields to trends predicted by physical models. By employing integration of hysteresis loops simulated from physical models for single-domain ferromagnets, we have identified ferrite …
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Helicopter rotor lift distributions for minimum induced power loss
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1993.
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Hybrid Electric Vehicle Control Strategy Based on Power Loss Calculations
… (HEV) is accomplished through calculating powertrain component losses. The results of these calculations define how the vehicle can decrease fuel consumption while maintaining low vehicle emissions. For a HEV, simply operating the vehicle's engine in its regions of high efficiency does not …
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Optimisation of a power distribution network's active power loss and reliability performance
The deregulation of UK power distribution market started in 1990. Due to the drivers from the regulator, DNOs need to invest appropriately and optimise network operation by innovations to satisfy the targets set by the industry regulator, the Office of Gas and Electricity Markets (Ofgem). Reduction …
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Optimal allocation of distributed generation for power loss reduction and voltage profile improvement
… of DG integration by optimal allocation in a power system network. These benefits include electrical power losses reduction and voltage profile improvement. Optimal DG location and sizing in a power system distribution network with the aim of reducing system power losses and improving the …
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Reconfiguration of distribution systems to reduce power loss using ant Colony Optimization and Simulated Annealing
… the optimal reconfiguration to minimize power losses of the test grid, the CIGRE network, and a grid owned by the Reykjavik area utility company Veitur, called A3-A5. It is implemented in Python, where the grid's data is obtained and processed with Pandapower, a software-based on python …
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Optimal placement of battery energy storage system for voltage profile improvement and power loss reduction
… total system costs associated with active power losses and voltage profile deviations. The methodology employs a dual-software approach, utilizing MATLAB for optimization algorithms and DigSilent PowerFactory for load flow analyses. Initial assessments establish a baseline scenario without …
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Simulation of SiC MOSFET Power Converters
… in the design and implementation of various power converters (Push-pull inverter, Buck converter). Different parameters and scenarios were discussed and implemented for both silicon and silicon carbide MOSFET cases. A comparison between same circuits is done using silicon in the first case …
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Secure Intermittent Computing: Precomputation and Implementation
… designed to retain their state across periods of power loss, for cases both when the device has an excess of available energy and when power loss is unavoidable. Existing work with intermittent systems has focused on the problems inherent to the intermittent paradigm and ignored the security …
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A MAXIMUM POWER POINT TRACKING TECHNIQUE FOR SINGLE-PHASE PHOTOVOLTAIC SYSTEMS WITH REDUCED DC-LINK CAPACITOR
Electrolytic capacitors used in photovoltaic (PV) power conditioning units (PCU) for power decoupling purposes are less reliable in nature. Film capacitors can be adopted instead of electrolytic capacitors if the energy storage requirement of the PCU is reduced, since they offer better reliability …
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Energy Harvesting Circuit with Input Matching in Boundary Conduction Mode for Electromagnetic Generators
… Generators (EMGs). In order to extract maximum power from an EMG, an AC-DC boost rectifier is designed to match the impedance of the EMG. Rather than operate a buck-boost converter in Discontinuous Conduction Mode (DCM) in other impedance matching cases, the proposed method is running the boost …
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Optimization of Power MOSFET for High-Frequency Synchronous Buck Converter
… low profile, fast transient response and high power density. However, high frequency also causes more power loss on MOSFETs. Optimization of the MOSFETs plays an important role in the system performance. Circuit and device modeling is important in understanding the relationship between the …
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Use of IGT/COMFET in zero current quasi resonant converters
… in a resonant converter. Dynamic saturation loss is identified as the predominant power loss in IGT/COMFET devices for very high frequency resonant operation. Device design change is suggested for very high frequency resonant operation applications.
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High Power Density and High Efficiency Converter Topologies for Renewable Energy Conversion and EV Applications
… that are suitable for high efficiency and high-power density energy conversion systems. The operation principle, modulation, and control strategy of these newly introduced converter topologies are presented in detail supported by simulation and experimental results. A thorough design …
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The Influence of Yaw and Coning on Small Bio-Inspired Wind Turbines
… coning angles (β) ranged from 5◦ to 25◦, and power and tip-speed ratio were measured at Reynolds numbers Re_D = [0.46 ×10^5, 1.8 ×10^5]. Results show that coning improves the power performance of a low aspect ratio small wind turbine. Compared to the reference rotor, i.e., rotor with …
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Contact resistance in RFID chip-antenna interfaces
… chip-antenna interface is the area of greatest power loss in the system, and by determining a relationship to increase the contact area in that region, the power loss to the antenna can be reduced. Moreover, an analysis including asperities on the micro scale geometry of the solids was …
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Design, Analysis and Implementation of Multiphase Synchronous Buck DC-DC Converter for Transportable Processor
… while the voltage has to decease to save the power loss. Therefore, it is necessary for a system designer to improve the efficiency of the voltage regulator converter (VRC) for the processor. Laptop processor architecture is more complicated than desktop because of different mode operations …
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Integrated Electro-thermal Design Methodology in Distributed Power Systems (DPS)
… CAD tools for thermal and electrical analyses in power electronic systems are available, traditional stand-alone simulation method seldom takes into consideration of the inter-dependency of semiconductor device power loss and junction temperature in an iterative process. However these dependencies …
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