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 68 for “"DGs"”.
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Integration of EVs and DGs into the Electric Power System for Grid Modernization
… complex. Penetration of distributed generators (DGs) are increasing rapidly. Among them, DG units with intermittent renewables resources, such as solar or wind, are attracting more attention. Moreover, plug in electric vehicles (EVs) are expected to be deployed in large numbers over the next …
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Power quality enhancement in electricity networks using grid-connected solar and wind based DGs
… integration of solar and wind-based intermittent DGs may however pose negative impacts on the quality of power supplied by the utility network. Some of the detrimental impacts of DG include voltage fluctuations, flicker, etc. which are in general categorised as power quality (PQ) problems. The …
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Development of a novel single-phase auto-reclosing scheme for distribution network with integrated distributed generation.
… the UK is to disconnect Distributed generators (DGs) immediately once a network fault is detected to prevent islanding operation and disruption of the operation of conventional auto-reclosing schemes. However, with the continuous increase of penetration of DGs into existing distribution networks, …
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Effects of dry versus modified wet distillers grains with solubles with or without calcium oxide on economics, growth performance, and ruminal metabolism of beef feedlot steers
… to determine the interaction of feeding dry (DDGS) or modified wet (MDGS) distillers grains with solubles (DGS) with or without calcium oxide (CaO) treatment to feedlot steers on: (1) growth performance, economics of gain, and USDA carcass grades; (2) pattern of intake and meal distribution; …
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Islanding detection in distribution system embedded with renewable-based distributed generation
… view by introducing distributed generations (DGs) into distribution systems, leading to a bi-directional power flow. Several benefits of embedding DGs into distribution systems, such as increased reliability and reduced system losses, can be achieved. However, when a zone of the distribution …
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Optimal Allocation of STATCOMs and Wind-Based Distributed Generators using a Stochastic Mathematical Program
… and wind-based distributed generators (W-DGs), considering the stochastic nature of wind velocities and load demands. The proposed optimization model is a mixed-integer nonlinear program (MINLP), which simultaneously allocates STATCOMs and W-DGs. It minimizes the costs of power losses, …
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Platelet Dense Granules Mature Within Late Stages Of Megakaryocyte Differentiation By Cargo Delivery
Platelet dense granules (DGs) are storage organelles for calcium ions, small organic molecules such as ADP and serotonin, and larger polyphosphates that are secreted upon platelet stimulation to enhance platelet activation, adhesion, and stabilization at sites of vascular damage. However, the …
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Reconfigurable phased microstrip antenna array with defected ground structure and defected microstrip structure for beam steering application
… first is based on a defected ground structure (DGS), while the second is a defected microstrip structure (DMS), which due to their slow wave effect and band-stop property, are able to disturb surface current distribution, then change the element phase and hence steer the main beam. This work …
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Power System Grid Planning with Distributed Generation
… load demand and to support economic growth. DGs change the conventional power flow (generation, transmission to distribution) by injecting real and reactive power at distribution voltage levels. The change in the conventional power flow creates complexity in the power system grid planning due …
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Power sharing conditioning control in single-phase parallel distributed generations with simple improvement of droop control
… power demand between Distributed Generations (DGs) in islanding microgrid when there is no support from the electricity distribution grid. The droop control is applied as the local control scheme to achieve power sharing among parallel inverters with DG sources. As it has been well established, …
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Grid Tie Inverter in a Distributed Generation System with Reactive Power Capabilities
… applications in a distributed generation system (DGS). This allows the local renewable energy sources in the DGS to provide the necessary reactive power support to the grid. The inverter utilizes a control algorithm to provide reactive power support to improve the voltage profile of the grid. A …
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Understanding the social impact of participation in Driven Game Shooting in the UK
… research base relating to driven game shooting (DGS) and its social impact. It looks at how involvement in DGS affects the people involved, using a recognised social impact assessment methodology with a theoretical underpinning of social capital theory. It considers the extent to which DGS …
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Anomalous Nature Of Metamaterial Inclusion and Compact Metamaterial-Inspired Antennas Model For Wireless Communication Systems. A Study of Anomalous Comportment of Small Metamaterial Inclusions and their Effects when Placed in the Vicinity of Antennas, and Investigation of Different Aspects of Metamaterial-Inspired Small Antenna Models
… compact, CSRR loaded monopole antenna with DGS has been proposed for WiMAX/WLAN operations. The introduction of CSRR induces frequency at lower WLAN 2.45 GHz band while the DGS has provided bandwidth enhancement in WiMAX and upper WLAN frequency bands, keeping the radiation pattern stable. …
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Advanced Power Sharing Scheme under Unbalanced and Nonlinear Loads in an Islanding Microgrid
… inaccurately between distributed generators (DGs) and voltage quality problems are critical issues under unbalanced and nonlinear loads in the micro grids. Thus, an advanced power sharing scheme with unbalanced and harmonic loads in islanding micro grid is presented to eradicate power sharing …
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Dynamic Geometry Environment And Its Relation To Thai Students’ Higher-Order Thinking: Reasoning In Euclidean Geometry
… in the late 1980s, Dynamic Geometry Software (DGS) has become one of the most innovative tools in mathematics education. It is defined as graphical software, where geometric figures can be constructed with pre-defined relationships, which will retain when the figures are dynamically …
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Performance of defected ground structure for rectangular microstrip patch antenna
… thickness 1.6 mm. The defect ground structure (DGS) has gained much attention over the last few years for its ability to increase the performance of wireless system by effectively suppressing harmonics DGS shows a better result compared to the conventional antenna. It effectively suppressing …
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Arbres N-racinés et un problème de Riemann-Hilbert rationnel : deux sujets de physique mathématique
… des matrices triangulaires p × p données dans [DGS]. Ces solutions sont exprimées à l'aide des intégrales de di érentielles méromorphes sur des contours fermés sur des surfaces de Riemann compactes. On a considéré deux cas particuliers des solutions de [DGS] obtenus par des choix particuliers de …
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Impacts of Distributed Generation on the Residential Distribution Network Operation
… AENS) of the system is performed by installing DGs as backup generators. Different DG penetration levels, locations and the impacts of installing one large-scale DG on the main distribution line vs. several small-scale randomly distributed DGs are explored. A residential distribution circuit in …
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Power sharing strategy using H∞ controller between two distributed generation sources in islanded mode
… of non-communication network is needed for the DGs with fast restoration of voltage and frequency in order to maintain the stability and sensitivity of the islanded system. This project aims to develop a robust distributed H ∞ power sharing strategy to overcome the problem of restoration. The …
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Design and development of a communication-assisted microgrid protection system
… resources based Distributed Generators (DGs) more desirable.
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