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 41 for “"WECS"”.
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Design and implementation of a grid-connected variable-speed PM WECS
As renewable energy (RE) sources are increasingly becoming an integral part of the world's power generation capacity, they are becoming more sophisticated and provide a solid platform for power generation today. Wind Energy is the fastest growing RE source. The correct understanding of issues …
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An assessment of the role of Ward Education Coordinators in Providing Managerial Support to Community Secondary Schools in Kibondo District, Tanzania
This study assessed the role of WECs in providing managerial support to CSSs in Kibondo district in Kigoma region. Three objectives were involved, to analyze the role of WECs in relation to CSSs, examine challenges of WECs in supporting CSSs and examine strategies employed by WECs in supervising …
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A Framework for Assessing the Reliability of Wind Energy Conversion Systems
… operability of wind energy conversion systems (WECSs). The increased penetration of wind energy into the grid imposes new operating conditions on power systems. This change requires development of an adequate reliability framework. This thesis proposes a framework for assessing WECS reliability …
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Optimization of the geometry of axisymmetric point-absorber wave energy converters
… have been conducted on wave energy converters (WECs), however as yet there has been no convergence on the optimal shape of a WEC. Furthermore, there is no agreed-upon definition of what it means for a WEC to be 'optimal' and no established framework to find optimal shapes. This thesis …
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Modelling Controlled Arrays of Wave Energy Converters
… by placing multiple wave energy converters (WECs) together in an array. In this thesis, the WEC array problem is investigated from two di�erent points of view: control and layout of individual WECs in an array. WEC arrays are modelled using hydrodynamic coe�cients from the Boundary Element …
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Current source based wind energy conversion system
… a variable-speed wind energy conversion system (WECS) that uses a permanent magnet synchronous generator (PMSG). It has been shown that the proposed current source converter based WECS can operate successfully under maximum power point tracking and meet all grid requirements such as ac fault …
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Optimal control of wave energy converters
Wave Energy Converters (WECs) are devices designed to absorb energy from ocean waves. The particular type of Wave Energy Converter (WEC) considered in this thesis is an oscillating body; energy conversion is carried out by means of a structure immersed in water which oscillates under forces exerted …
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Development of a multilevel converter topology for transformer-less connection of renewable energy systems
… of using wind energy conversion systems (WECSs) to generate electrical power. One important technology is the power electronics interface that enables the transfer and effective control of electrical power from the renewable energy source to the grid through the filter and isolation …
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Control of Modular Multilevel Converters for Grid Integration of Full-Scale Wind Energy Conversion Systems
… system of a wind energy conversion system (WECS) needs to meet the stringent requirements in terms of reliability, efficiency, scalability and ease of maintenance, power quality, and dv/dt stress on the generator/transformer. Although the multilevel converters including the neutral point …
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Design and Analysis of a Small-Scale Wind Energy Conversion System
… the small scale wind energy conversion system (WECS) design and implementation. The dissertation will focus on implementing a hardware prototype to be used for testing different control strategies applied to small scale WECSs. Novel control algorithms will be proposed to the WECS and will be …
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The Impact of Large Scale Wave Energy Converter Farms on the Regional Wave Climate
… numerical simulation of Wave Energy Converters (WECs) has become a necessity. This enables the representation of many hydrodynamic interactions, allowing wave models to simulate processes from quantifying wave loading on a device to cumulative environmental impact of multiple arrays. This thesis …
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Improvements in the numerical modelling of wake effects for wave energy converter farms
… that large farms of Wave Energy Converters (WECs) will be installed in the sea and as part of the consenting process it will be necessary to quantify their impact on the local environment. The physics of the wave field around the WEC farm is important since it affects coastal processes and …
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Multiple Three-Phase Induction Generators for Wind Energy Conversion Systems
… generator in wind energy conversion systems (WECS). In particular, multiphase generators that comprise multiple 3-phase winding sets, where each winding set is supplied using an independent 3-phase voltage source inverter (VSI), are studied. It is claimed that these topologies offer advantages …
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A low speed wind energy conversion for home system in a developing country : design, technology and policies for rural electrification in Indonesia
… the modern world.Wind energy conversion systems (WECS) have long been known in most parts of theworld, yet their implementation is not as popular as fossil fuel energy. The uneconomical costof energy production, and uncertainty of wind energy availability are the main reasons for …
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Hydrodynamic excitation force estimation and forecasting for wave energy applications
… such as deploying Wave Energy Converters (WECs) in large arrays or optimal control of WECs. The majority of WEC optimal control strategies require knowledge of the previous, current, and future excitation force acting on the device. However, for the WEC case, the excitation force is an …
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Renewable electric power systems energy yield and performance estimation
… (PVECS) and wind energy conversion systems (WECS). A major impediment in formulating these models is the lack of precise data on model parameters, e.g., component failure and repair rates. Additionally, inputs to these models (e.g., incident insolation in PVECS and wind speed in WECS) are …
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Real-time Forecasting and Control for Oscillating Wave Energy Devices
… economic performance of Wave energy converters (WECs), still far from being competitive, a large scope exists for the improvement of their capacity factor through more intelligent control systems. Most control solutions proposed in the literature, for the enhancement of the power absorption of …
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DFIG-Based Split-Shaft Wind Energy Conversion Systems
… a Split-Shaft Wind Energy Conversion System (SS-WECS) is investigated to improve the performance and cost of the system and reduce the wind power uncertainty influences on the power grid. This system utilizes a lightweight Hydraulic Transmission System (HTS) instead of the traditional gearbox and …
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Numerical investigation of the performance of WEC integrated with vertical wall using CFD
… In this thesis, Wave Energy Converters (WECs) assume a pivotal role, and researchers have undertaken extensive investigations into various methodologies aimed at optimizing their efficiency. The thesis presents a comprehensive exploration of the synergistic impact that arises from the …
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Design and implementation of variable speed wind energy induction generator systems for fault studies
… benefits, Wind Energy Conversion Systems (WECS) have received tremendous growth in the past decade. The increased interest in wind energy has made it necessary to model and experimentally evaluate entire WECS, so as to attain a better understanding and to assess the performance of various …
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