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 28 for “"current limiting"”.
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Design and analysis of a 200 volt, high slew rate, current-limited operational amplifier
… the kV/s range, while having clean, adjustable current limiting and low quiescent current consumption. Several common amplifier topologies are examined, with their merits and drawbacks discussed in the context of the use case. Ultimately, a hybridized approach is taken for an input stage for the …
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Investigation of disintegration and arcing in electric fuses
… fuse elements when subjected to excessive fault currents. The basis of the study involved experimental observation of disintegration of fuse elements and the analysis of the dynamic responses of current-carrying conductors, which precipitate disintegration. The experimental techniques employed …
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Distributed Electric Aircraft Propulsion Architectures with Fault Protection Strategy
… strategy for the DEAP system that includes, current limiting and I2t based strategies. DEAP systems utilize the DC bus system at higher voltage levels than conventional systems ranging from +/- 0.5 kV to +/-5 kV. In addition to partial discharge effects, there are other challenges, …
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Design and model: Intelligent solid-state current limiter to prevent sympathetic tripping problem on power and energy applications
… major cause of the Sympathetic Tripping Problem. Limiting fault current and using synchronous condensers for reactive power support were shown to solve the Sympathetic Tripping Problem.
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Transient Model of Heat,Mass,and Charge transfer as well as Electrochemistry in the Cathode Catalyst Layer of a PEMFC
… of the features of the pseudo-homogeneous models currently present in the literature, considers the kinetics of the electrochemical reaction taking place at the platinum surface, the proton transport through the polymer agglomerates, and the oxygen and water transport within the pores as well as …
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A high voltage, high current, low error operational amplifier with novel features
… are chiefly formed around high voltage and high current drive functionality. A novel topology is introduced which compensates base current errors introduced by the individual stages, resulting in a very low (first-order canceled) overall input-referred voltage offset. Novel features are …
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Smart Power Module for Distributed Sensor Power Network of an Unmanned Ground Vehicle
… average efficiency of 96.7% for loads from 1-4A. Current monitoring and an adjustable output current limit were provided through a second circuit board within the same module enclosure. The module processing element sends periodic updates and receives commands over a CAN bus. The smart power …
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High performance on-line control of three-phase PWM current-source converters
… intermediate dc link, the voltage-source and the current-source. Despite the advantages of the current-source topology such as current limiting, higher reliability, and low ac-voltage harmonic distortion, voltage-source topologies are more widely used. This is in part due to the fact that …
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Feature scaling of large, ballasted, field emission arrays
… electron transport, and their potential for high current density and high current, especially when they are used in an array format. However, a major challenge preventing the widespread use of this technology are the spatial and temporal variations that arise from non-uniformity in emitter tip …
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DC Fault Current Analysis and Control for Modular Multilevel Converters
… distributed energy storage, and near ideal current and voltage scalability. The fault response, on the other hand, is a big challenge for the MVDC distribution systems and the traditional MMCs with the Half-Bridge submodule configuration, especially when a DC short circuit fault happens. In …
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Killer asteroids : feasibility of using the IRTF to track near-earth objects
… objects which could potentially impact Earth. Currently, no comprehensive catalog of Near Earth Objects (NEOs) exists which contains information on the physical properties of the objects. Spectroscopic observation of NEOs must be carried out in an efficient and timely manner in order to …
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On the protection of compact DC power systems with high-power energy storage
… with high bandwidth control systems and current limiting functionality. To date, the literature has primarily focused on the control and behaviour of high-power ESS during normal operating conditions with an emphasis on the systems level benefits they offer. Little consideration has been …
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Open Issues in the search for gravitational wave transients
… may be confused with true signals, and are the current limiting factor in search sensitivity and detection confidence for any real event. The first part of this thesis focuses on the development of tools to identify, monitor and characterize these instrumental disturbances in LIGO and Virgo …
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Control and operation of offshore wind farms connected with diode rectifier HVDC systems
… voltage control combined with a WT overvoltage limiting control is proposed. With this control scheme, active power re-balance between the offshore and onshore side is achieved faster and thus, the MMC submodule capacitor overvoltage is alleviated. During offshore AC faults, a current limiting …
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Transmission grid strength analysis and operation of inverter-based microgrids
… model is developed based on the voltage and current control loops with a current limiter. The current limiting algorithm for the steady-state solver is developed and incorporated into the short-circuit study process. Moreover, voltage imbalance mitigation control of grid-forming inverters …
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The Next Generation Balloon-Borne Large Aperture Submillimeter Telescope (blast-Tng)
… ever-increasing rate of scientific progress. The current limiting factor that determines how many MKIDs can be placed on the same readout line is the bandwidth and processing limitations of the readout hardware. BLAST-TNG has pushed this technology forward by implementing the first Reconfigurable …
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Is hunting still healthy? strengths and limitations of dominant discourses used to examine contemporary indigenous land-health Interrelationships
… examined the strengths and limitations of the current dominant discourses in 'Indigenous health' as they related to LBP participation. The data analyses identified socio-demographic characteristics of those participating in one of the major LBPs in this region, i.e. hunting, and examined these …
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Is hunting still healthy? strengths and limitations of dominant discourses used to examine contemporary indigenous land-health Interrelationships
… examined the strengths and limitations of the current dominant discourses in 'Indigenous health' as they related to LBP participation. The data analyses identified socio-demographic characteristics of those participating in one of the major LBPs in this region, i.e. hunting, and examined these …
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