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 211 for “"Outage"”.
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Outage probability at finite SNR
… thesis, we present a technique to reduce the outage probability of a single user multiple input multiple output (MIMO) channel when a sub-optimal transceiver architecture is used. We show that in slow-fading scenarios, the outage probability can be improved by using unitary rotations combined …
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Outage performance of cooperative cognitive relay networks
… has been analysed to derive the closed-form outage probability expressions for the repetition-based and selection-based protocols. Both decode-and-forward and amplify-and-forward relaying schemes have been employed for these protocols. When the probability of spectrum availability is unity, …
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Line and Generator Outage Identification using Synchrophasor Measurements
Identification of outages in power systems is crucial to raise situational awareness and prevent cascading failures. As a result of wide adoption of phasor measurement units (PMUs), synchronized measurements with high temporal resolution provide new opportunities for event detection and …
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Quickest change detection with applications to line outage detection
… detection (QCD) theory in the problem of line outage detection and identification. We start by discussing fundamental results of sequential hypothesis testing and QCD, and by proposing an algorithm for the QCD setting under transient dynamics. Following, we apply these results in the line …
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An investigation into optimizing nuclear power plant outage durations
There is a compelling rationale for outage optimization as it presents numerous benefits for the Nuclear Power Plant (NPP) and accordingly, for the economy of a country, the environment, and society. An outage delay of one day has been reported to be equivalent to a loss of USD1.5m-2m per day, not …
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Outage prediction modelling of terrestrial free space optics for tropical region
… ratio (SNR) was used to study the outage performance of the FSO link under hazy weather conditions. The performance analysis was based on 2013, 2014 and 2015 collected visibility data from Malaysian Meteorological Department (MMD) for four stations located at KLIA Sepang, Bayan …
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A Line Outage Study for Prediction of Static Power Flow Redistribution
… to the system and causes damage. When line outage happens, the power flow on the tripped line will be redistributed to the rest of lines in the system. It may cause risk of overload happens on other lines, and results in a cascading failure and system collapse. Reasonably, a single line …
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Bit error rate simulation enhancement and outage prediction in mobile communication systems
… that have been added. The bit error rate and outage performance of the simulator is compared with analytical results. A study of the impact of the distribution of magnitude and phase components within a channel impulse response is performed. A study utilizing both timing recovery and timing …
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Impact of Power Outage to Small and Medium Enterprise at Small Industries Development Organization (SIDO) Dar Es Salaam
… was study was to assess the effects of power outage to SMEs by using SIDO Dar es Salaam as a case study. In order to achieve this objective, the study had several specific objectives that reduced the main objective into simple objectives that are also achievable. These objectives included; To …
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The Capabilities and Limitations of Flywheel-based Energy Storage System Pertaining to Subways in the Event of a Power Outage
<p>In the city that never sleeps, power outages or blackouts can be a shock, especially if you are on a train amid one. For example, during the infamous 2003 blackout, thousands of people were left stuck and stranded in parts of Northeastern United States. In particular, with no trains or buses in …
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Project complexity and how to effectively measure complexity in projects: the case of a refuelling outage in a nuclear power generating plant
… and the unit of analysis was the refuelling outage in a nuclear power generating plant. Focus group was adopted as a technique to gather information. A group of project managers with wealth of knowledge in refuelling outages were assembled. They were given the complexity assessment matrix to …
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Multiple-Element Contingency Screening
… this work is to efficiently determine the double-outage contingencies that threaten the operation of the power system. This work is necessary because enormous numbers of double-outage contingencies exist for even relatively small systems, and new standards require system operators to begin …
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Small signal analysis of power systems: Eigenvalue tracking method and eigenvalue estimation contingency screening for DSA
… part of this dissertation develops a new line outage screening method for dynamic security analysis (DSA). The new screening method extends the use of distribution factors commonly used in static security analysis (SSA) to DSA by using the factors with eigenvalue sensitivities to estimate the …
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Free-space optical networks : fade and interference mitigation and network congestion control
… We also derive the improvement in expected outage length with diversity, and quantify the amount of interference that the system can handle while still achieving a given outage probability. Although signal fades or 'outages' in an FSO link can be mitigated on the Physical Layer, they cannot …
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Environmental and economic analysis of thermal energy storage for a district heating system in Bolungarvik
… but these regions also experience frequent outages. The current backup systems supporting the energy demand in the Westfjords during outages are highly polluting diesel fueled generators and boilers. Finding a more reliable solution for heating and reducing emissions are time-sensitive …
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Towards unifying multi-resolution and multi-description : a distortion-diversity perspective
… between end-to-end distortion level and the outage probability as our performance metric, namely distortion-diversity tradeoff. In the high SNR regime, within the distortion-diversity tradeoff framework, we are able to differentiate two source-channel schemes, one based on multi-resolution …
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