Дисертації з теми "090607 Power and Energy Systems Engineering (excl. Renewable Power)"
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Hung, Duong Quoc. "Smart integration of distributed renewable generation and battery energy storage." Thesis, The University of Queensland, 2014. https://espace.library.uq.edu.au/view/UQ:342027.
Повний текст джерелаKelso, Ross. "Open access to next generation broadband." Thesis, Queensland University of Technology, 2008. https://eprints.qut.edu.au/12663/1/12663a.pdf.
Повний текст джерела(9970334), Sofia Paola Espinell Gonzalez. "PUERTO RICO POWER SYSTEM TRANSITION TO RENEWABLE ENERGY." Thesis, 2021.
Знайти повний текст джерелаPuerto Rico’s lack of effective and affordable energy substitutes after Hurricane Maria resulted in a mortality increase of 4,970 residents (Verma, Murray, and Mamdani, 2018). Puerto Rico’s Island dependency on electric power and no energy substitutes available have provoked a risk to human life after catastrophic events. The problem was measured by comparing Puerto Rico’s reliance on fossil fuels with accessible and economical renewable energy options. Solar photovoltaic (PV) technologies are the optimum alternative to transition from fossil fuel usage to renewable energy. Previous research has demonstrated the impact of using solar panels instead of an electric grid due to the constant solar radiation throughout the year. The analyzed data and projections showed a reduction in fossil fuels and carbon dioxide emissions by implementing solar photovoltaic technologies. The installation of PV systems in landfills, household roofs and transitioning to solar public lighting positively impacts the atmosphere carbon dioxide emissions.
(9748934), Sugirdhalakshmi Ramaraj. "A HYBRID NETWORK FLOW ALGORITHM FOR THE OPTIMAL CONTROL OF LARGE-SCALE DISTRIBUTED ENERGY SYSTEMS." Thesis, 2020.
Знайти повний текст джерела(7041383), Carl J. Olthoff. "Computation of Large Displacement Stability Metrics in DC Power Systems." Thesis, 2019.
Знайти повний текст джерела(9187742), SAYEDMOHAMMADMA VAEZ MOMENI. "FEED-FORWARD NEURAL NETWORK (FFNN) BASED OPTIMIZATION OF AIR HANDLING UNITS: A STATE-OF-THE-ART DATA-DRIVEN DEMAND-CONTROLLED VENTILATION STRATEGY." Thesis, 2020.
Знайти повний текст джерела(6615489), Gregory Vaughan. "Determining One-Shot Control Criteria in Western North American Power Grid with Swarm Optimization." Thesis, 2019.
Знайти повний текст джерелаThis thesis primarily used particle swarm optimization (PSO) with inertia to determine a well-adapted set of parameters. The parameters included up to three thresholds for indices calculated from frequency. The researchers found that the best method for distinguishing between one or more phase faults used thresholds on two Fourier indices. Future lines of research regarding one-shot controls were considered.
generation events from transient swings caused by other events.
This thesis found that using local modes is generally useful to diagnose and apply one-shot controls when instability is caused by one or more phase faults, while when disconnected generators or reduced loads cause instability in the system, the local modes did not distinguish between loss of generation capacity events and reduced load events. Instead, differentiating based on the rate of change of frequency and an initial upward deflection of frequency or an initial downward deflection of frequency did distinguish between these types of events.
(9581096), Olatunji T. Fulani. "A Heterogeneous Multirate Simulation Approach for Wide-bandgap-based Electric Drive Systems." Thesis, 2021.
Знайти повний текст джерелаRecent developments in semiconductor device technology have seen the advent of wide-bandgap (WBG) based devices that enable operation at high switching frequencies. These devices, such as silicon carbide (SiC) metal-oxide-semiconductor field-effect transistors (MOSFETs), are becoming a favored choice in inverters for electric drive systems because of their lower switching losses and higher allowable operating temperature. However, the fast switching of such devices implies increased voltage edge rates (high dv/dt) that give rise to various undesirable effects including large common-mode currents, electromagnetic interference, transient overvoltages, insulation failure due to the overvoltages, and bearing failures due to
microarcs. With increased use of these devices in transportation and industrial applications, it is imperative that accurate models and efficient simulation tools, which can predict these high-frequency effects and accompanying system losses, be established. This research initially focuses on establishing an accurate wideband model of a surface-mount permanent-magnet
ac machine supplied by a WBG-based inverter. A new multirate simulation framework for predicting the transient behavior and estimating the power losses is then set forth. In this approach,
the wideband model is separated into high- and low-frequency models implemented using two different computer programs that are best suited for the respective time scales. Repetitive execution of the high-frequency model yields look-up tables for the switching losses in the semiconductors, electric machine, and interconnecting cable. These look-up tables are then incorporated into the low-frequency model that establishes the conduction
losses. This method is applied to a WBG-based electric drive comprised of a SiC inverter and permanent-magnet ac machine. Comparisons of measured and simulated transients are provided.
(10725597), Omkar Mahesh Parkar. "Multi-Objective Optimization of Plug-in HEV Powertrain Using Modified Particle Swarm Optimization." Thesis, 2021.
Знайти повний текст джерела(11192433), Lucas Martin Peralta Bogarin. "A Comparison of Models and Approaches to Model Predictive Control of Synchronous Machine-based Microgrids." Thesis, 2021.
Знайти повний текст джерела(8790188), Abhishek Navarkar. "MACHINE LEARNING MODEL FOR ESTIMATION OF SYSTEM PROPERTIES DURING CYCLING OF COAL-FIRED STEAM GENERATOR." Thesis, 2020.
Знайти повний текст джерела(5931146), David Vance. "Developing a PV and Energy Storage Sizing Methodology for Off-Grid Communities." Thesis, 2019.
Знайти повний текст джерела(11256321), Manuel Eduardo Mar Valencia. "RESIDENTIAL ELECTRICITY CONSUMPTION ANALYSIS: A CROSSDOMAIN APPROACH TO EVALUATE THE IMPACT OF COVID-19 IN A RESIDENTIAL AREA IN INDIANA." Thesis, 2021.
Знайти повний текст джерелаis a phenomenon that can be studied to observe how electricity loads have changed during the stayat-home order weeks. The data collection process was done through online surveys and using
publicly available data. This study is focusing on analyzing household energy units such as
appliances, HVAC, lighting systems. However, collecting this data is expensive and timeconsuming since dwellings would have to be studied individually. As a solution, previous studies
have shown success in characterizing residential electricity using surveys with stochastic models.
This characterized electricity consumption data allows the researchers to generate a predictive
model, make a regression and understand the data. In that way, the data collection process will not
be as costly as installing measuring instruments or smart meters. The input data will be the
behavioral characteristics of each participant; meanwhile, the output of the analysis will be the
estimated electricity consumption "kWh." After generating the "kWh" target, a sensitivity analysis
will be done to observe the electricity consumption through time and examine how people evolved
their load during and after the stay-at-home order.
This research can help understand the change in electricity consumption of people who
worked at home during the pandemic and generate energy indicators and costs such as home office
electricity cost kWh/year. In addition to utilities and energy, managers can benefit from having a
clear understanding of domestic consumers during emergency scenarios as pandemics.
(10710579), Amy M. Bohinsky. "Operando Degradation Diagnostics and Fast Charging Analytics in Lithium-Ion Batteries." Thesis, 2021.
Знайти повний текст джерелаFast charging is crucial to the proliferation of electric vehicles. Fast charging is limited by lithium plating, which is the deposition of lithium metal on the anode surface instead of intercalation of lithium into the anode. Lithium plating causes capacity fade, increases cell resistance, and presents safety issues. A fast charging strategy was implemented using a battery management system (BMS) that avoided lithium plating by predicting the anode impedance. Commercial pouch cells modified with a reference electrode were cycled with and without the BMS. Cells cycled with the BMS avoided lithium plating but experienced significant degradation at the cathode. Cells cycled without the BMS underwent extensive lithium plating at the anode. Capacity loss was differentiated into irreversible and irretrievable capacity to understand electrode-based degradation mechanisms. Post-mortem analysis on harvested electrodes showed that the BMS cycled cells exhibited minimal anode degradation and had a two-times higher capacity loss on the cathode. The cells cycled without the BMS had extensive anode degradation caused by lithium plating and a seven-times higher capacity loss on the anode.
Understanding and preventing the aging mechanisms of lithium-ion batteries is necessary to prolong battery life. Traditional full cell measurements are limited because they cannot differentiate between degradation processes that occur separately on anode and cathode. A reference electrode was inserted into commercial cylindrical lithium-ion cells to deconvolute the anode and cathode performance from the overall cell performance. Two configurations of the reference electrode placement inside the cell were tested to find a location that was stable and had minimal interference on the full cell performance. The reference electrode inside the mandrel of the cylindrical cell had stable potential measurements for 80 cycles and at different C-rates and had minimal impact on the full cell performance.
(9192758), Jorge Leon Quiroga. "DIGITAL HYDRAULICS IN ELECTRIC HYBRID VEHICLES TO IMPROVE EFFICIENCY AND BATTERY USE." Thesis, 2020.
Знайти повний текст джерела(10653461), Veronica R. Bosquezfoti. "Distributed Optimization Algorithms for Inter-regional Coordination of Electricity Markets." Thesis, 2021.
Знайти повний текст джерелаIn the US, seven regional transmission organizations (RTOs) operate wholesale electricity markets within three largely independent transmission systems, the largest of which includes five RTO regions and many vertically integrated utilities.
RTOs operate a day-ahead and a real-time market. In the day-ahead market, generation and demand-side resources are optimally scheduled based on bids and offers for the next day. Those schedules are adjusted according to actual operating conditions in the real-time market. Both markets involve a unit commitment calculation, a mixed integer program that determines which generators will be online, and an economic dispatch calculation, an optimization determines the output of each online generator for every interval and calculates locational marginal prices (LMPs).
The use of LMPs for the management of congestion in RTO transmission systems has brought efficiency and transparency to the operation of electric power systems and provides price signals that highlight the need for investment in transmission and generation. Through this work, we aim to extend these efficiency and transparency gains to the coordination across RTOs. Existing market-based inter-regional coordination schemes are limited to incremental changes in real-time markets.
We propose a multi-regional unit-commitment that enables coordination in the day-ahead timeframe by applying a distributed approach to approximate a system-wide optimal commitment and dispatch while allowing each region to largely maintain their own rules, model only internal transmission up to the boundary, and keep sensitive financial information confidential. A heuristic algorithm based on an extension of the alternating directions method of multipliers (ADMM) for the mixed integer program is applied to the unit commitment.
The proposed coordinated solution was simulated and compared to the ideal single-market scenario and to a representation of the current uncoordinated solution, achieving at least 58% of the maximum potential savings, which, in terms of the annual cost of electric generation in the US, could add up to nearly $7 billion per year. In addition to the coordinated day-ahead solution, we develop a distributed solution for financial transmission rights (FTR) auctions with minimal information sharing across RTOs that constitutes the first known work to provide a viable option for market participants to seamlessly hedge price variability exposure on cross-border transactions.(8848484), Arturo Garcia. "EXPERIMENT AND MODELING OF COPPER INDIUM GALLIUM DISELENIDE (CIGS) SOLAR CELL: EFFECT OF AXIAL LOADING AND ROLLING." Thesis, 2020.
Знайти повний текст джерела(11037774), Shitij Tushar Avlani. "Design of Intelligent Internet of Things and Internet of Bodies Sensor Nodes." Thesis, 2021.
Знайти повний текст джерела(9751112), Elena A. Robles Molina. "EVALUATIONS ON ENZYMATIC EPOXIDATION, EFFICIENCY AND DECAY." Thesis, 2020.
Знайти повний текст джерелаThe potential use of enzymes in industrial synthesis of epoxidized soybean oil has been limited through the high cost of the enzyme catalyst, in this work we evaluate the effectiveness of chemo enzymatic epoxidation of high oleic soybean oil (HOSBO) using lipase B from Candida antarctica (CALB) on immobilization support Immobead 150 and H2O2 in a solvent-free system. Additionally, we evaluated the production decay rates for hydrolytic activity and epoxide product formation over consecutive batches to determine half-life of the enzyme catalyst.
Batch epoxidation of HOSBO using CALB on 4wt% loading shows yields higher than 90% after 12 hrs. of reaction, and with a correlation to the consumption of double bonds suggesting that the reaction is selective and limiting side product reactions. Non-selective hydrolysis of oil was not found beyond the initial hydrolysis degree of raw HOSBO. Evaluations of decay given by epoxide product formation and released free fatty acids shows a half-life of the enzyme catalyst on these activities is of 22 ad 25 hrs. respectively. Finally, we evaluated the physical parameters influencing this decay, and found that H2O2 presence is the most important parameter of enzyme inactivation with no significant effect from its slowed addition. We propose a new reactor configuration for the analysis of the specific steps on epoxide formation through peracid intermediates.
(5931020), Babak Bahrami Asl. "FUTURISTIC AIR COMPRESSOR SYSTEM DESIGN AND OPERATION BY USING ARTIFICIAL INTELLIGENCE." Thesis, 2020.
Знайти повний текст джерела(9525959), Reza Asadpour. "EXPLORING THE POTENTIAL OF LOW-COST PEROVSKITE CELLS AND IMPROVED MODULE RELIABILITY TO REDUCE LEVELIZED COST OF ELECTRICITY." Thesis, 2020.
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