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 160 for “"intermittency"”.
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Economic modeling of intermittency in wind power generation
… and the potential costs of compensating for the intermittency. The goal of this thesis research is to assess the costs and potential of wind power as a greenhouse gas abatement option for electricity generation. Qualitative and quantitative analysis methods are used to evaluate the challenges …
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Essays On Wind Energy Integration And The Costs Of Intermittency
… chapters. In chapter 1, I analyze the costs of intermittency in European whole-sale power markets. Intermittent dispatch is a barrier to the widespread adoption of renewables. I revisit this issue from a sufficient statistic perspective by observing that in a very general environment, the cost …
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Economic and technical impacts of wind variability and intermittency on long-term generation expansion planning in the U.S
Electricity power systems are a major source of carbon dioxide emissions and are thus required to change dramatically under climate policy. Large-scale deployment of wind power has emerged as one key driver of the shift from conventional fossil-fuels to renewable sources. However, technical and …
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Smoothing PV output fluctuation using cooling fan
… its effects on power system because of its intermittency and zero inertia, in this project I am trying to smooth solar power using electrical consumer. The purpose of this project is to absorb PV output fluctuation as much as possible with electrical consumer in buildings such as cooling …
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Analysis of Time-Varying Characteristics of Simulated Turbulence in Wind Tunnel
… time domain. This makes it possible to study the intermittency event, one important characteristic associated with pressure peak activities in turbulence. Three parameters, scale energy, intermittency factor and intermittency energy are defined. Variation of these quantities as a result of …
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An investigation into the discrete nature of human arm movements
… or visual tracing of curved shapes. If the intermittency phenomenon could be demonstrated to be part of the arm controller strategy, it would be potentially exploitable as a basis for measuring upper limb performance as well as for estimating the internal states of the arm controller. Before …
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Turbulence in geophysics: from rotating, ionized fluids to sediment transport
… dynamical time-scale in the system. Part II: "Intermittency in bed load sediment transport." Sediment transport by wind or water near the threshold of grain motion is dominated by rare transport events. This type of intermittency, termed 'on-off' intermittency, makes it difficult to calibrate …
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Transition in boundary layer flows
… a successful method of obtaining reliable intermittency values from a hot wire signal was developed.<br/><br/>The influence of freestream turbulence and pressure gradient upon transition within a boundary layer developing on a flat plate is elucidated by a series of controlled …
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Modular multilevel converters for solar photovoltaic - battery energy storage system integration
PV systems have intermittency and partial shading challenges which endanger the stability and reliability of electric grids. Due to their scalable and modular structure, modular multilevel converters (MMC) are suitable for grid integration of PV and battery energy storage system (BESS). This thesis …
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Resource allocation and load-shedding policies based on Markov decision processes for renewable energy generation and storage
… forms. Wind energy, for example can introduce intermittency. In this thesis, we discuss a method to deal with this intermittency. In particular, by shedding some specific amount of load we can avoid a total system breakdown of the entire power plant. The load shedding method discussed in this …
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Integration of Energy Storage into a Future Energy System with a High Penetration of Distributed Photovoltaic Generation
… generation by mitigating the effects of intermittency. </p> <p>As is the case with other equipment on electric distribution systems, it is necessary to follow appropriate methodologies in order to ensure that ESU are installed in a cost-effective manner and their benefits are realized. …
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Boundary layer development from transition provoking devices
… trip wire, with the streamwise mean intermittency distribution described by the normal distribution function. Significantly, the condition of "transition at the wire" is found to have a very small but well defined intermittency growth region.<br/><br/>Transition due to isolated …
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The impact of wind generation on power system voltage stability
… is characterised by its variability and intermittency, and as such present major challenges to power system operators. Some of these challenges are examined in detail in this thesis. The main focus is on the impact of DFIG based wind generation on system voltage stability. Therefore, the …
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Development of 2d metallic nanomaterials for nanofluids with application in concentrating solar power
… solar irradiation and therefore suffers of daily intermittency. The integration of concentrated solar power plants in hybrid power blocks has been proposed as a solution for this intermittency by taking advantage of thermal energy storage to maintain production and compensate the supply. A …
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Deformation and residual stresses at the intragranular scale – a study using high energy x-ray diffraction and modeling in polycrystalline alloys
… system activities, strain rate sensitivities and intermittency in plasticity (jerky motion of dislocations) within individual grains of a Ti-7Al alloy sample so as to interpret the deformation mechanisms and locate any weak spots at that length scale. A high speed mixed mode pixel array detector …
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A study of motor control in healthy subjects and in Parkinson's disease patients
… Further kinematic analyses, including movement intermittency and harmonicity, number and type of submovements (movement primitives) fit per movement cycle, and the effects of vision on intermittency were used to support the model we propose, whereby there exist two subtypes of rhythmic movement; …
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Machine Learning based Methods to Improve Power System Operation under High Renewable Pennetration
… Under higher penetration of solar and wind, the intermittency of the energy source poses critical problems in forecasting, uncertainty quantification, reserve man- agement, unit commitment, and economic dispatch, and presents unique challenges to the distribution system, including predicting …
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Oceanic microstructure observed near Bermuda using a towed sensor
… and more general objective was to measure the intermittency of mixing events in the ocean; and also, by measuring the RMS gradients of temperature and salinity in such events, to evaluate directly the intensity of vertical mixing. Since a horizontally-towed sensor is essential if salt fingers …
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The Effects of Water Storage and Meteorological Conditions on Enteric Infections from a Matched-Control Trial in Beira, Mozambique
… in rapidly growing urban centers. However, water intermittency and water storage practices, as well as impacts of meteorological conditions, may interfere with the progress made by drinking water interventions. Results from the PAASIM study, a matched-control trial assessing a piped water supply …
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The role of wind generation in European power sector decarbonization : a general equilibrium analysis
… results, a new methodology for capturing wind intermittency in EPPA, through modeling system flexibility requirements at large wind penetration levels, was proposed. As a case study, a 40% and an 80% GHG emissions reduction scenarios by 2050 (relative to 1990 levels) were modeled for Europe. …
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