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 72 for “"Renewable energy systems"”.
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Multilevel inverters for renewable energy systems
… of reducing these greenhouse gases is to turn to renewable energy sources such as the solar, wind etc instead of coal. Converters play the crucial role of converting the renewable source dc power to ac single phase or multiphase. The advancement in research in renewable energy sources and energy …
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Machine Learning Applications in Blockchain for Renewable Energy Systems
The transition towards decentralized renewable energy systems offers a critical solution to the "Energy Trilemma," yet its practical implementation in emerging economies such as South Africa is obstructed by grid instability, inaccurate demand planning, and the lack of secure local market …
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Optimizing the integration of renewable energy systems in buildings
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
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Optimal sizing of hybrid renewable energy systems for rural electrification
… and recommendations of sizing of hybrid renewable energy systems in rural areas in South Africa. This involves the development of a tool which would analyse information input about the climate of the area and the load demand.
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Ac-dc Bus-interface Bi-directional Converters in Renewable Energy Systems
… ac-dc bus-interface bi-directional converters in renewable energy systems. The dissertation explores a dc-electronic distribution system for residential and commercial applications with a focus on the design of an ac-dc bi-directional converter for such application. This converter is named as the …
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Modelling and Assessment of Renewable Energy Systems for Remote Rural Areas in Nigeria
Energy production over the years has depended largely on carbon-dense fossil fuels, and these reserves are depleting. Carbon per se is associated with pollution and one of the consequences of over-dependence on this for energy is the observed environmental imbalance causing climate change. There …
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A methodology to assess the interactions of renewable energy systems dynamics with fluctuating loads
… operational tool to integrate photovoltaic (PV) systems into the utility's generation mix. It is recognized that much of the existing research concentrated on the central PV system, its operations, and long-term planning with PV system and concluded that technical problems in PV_ operation. will …
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Development of a multilevel converter topology for transformer-less connection of renewable energy systems
… ongoing research theme in the last decade. Clean energy sources (such as wind energy and solar energy) have considerable potential to reduce reliance on fossil fuels and mitigate climate change. However, wind energy is going to become more mainstream due to technological advancement and …
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A Spatial Decision Support System for the Development of Multi-Source Renewable Energy Systems
… of a comprehensive decision support system for energy planning through the increased use of renewable energy sources, while still considering the role of existing electricity generating facilities. This dissertation focuses on energy planning at the regional level, with the Greater Southern …
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Investigation of a High-Frequency Link Single-Stage Asymmetrical Multilevel Converter for Grid Integration of Renewable Energy Systems
… topologies have been investigated to integrate renewable energy systems to the grid. Cascaded multilevel converters with a high- frequency link have emerged as a viable candidate for such applications. Electrical isolation can be provided using a compact high-frequency transformer connected in …
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Beyond PWM: Active balancing, start-up and ZVS for multi-level converters with applications in renewable energy systems
This dissertation addresses many of the operational challenges of flying capacitor multi-level (FCML) converters and introduces new techniques to improve performance. First, start-up and a new method to extract power from within an FCML converter at a naturally occurring low-voltage node are …
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A Parallel-Series Two Bridge DC/DC Converter for PV Power Conditioning Systems Used in Hybrid Renewable Energy Systems
… The intended application is power conditioning systems (PCS) of photovoltaic (PV) arrays used in hybrid renewable energy system architectures. The proposed topology provides two degrees of freedom which allows the PV-PCS to regulate the DC-link voltage, while tracking the maximum power point …
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Improved System Models for Building-Integrated Hybrid Renewable Energy Systems with Advanced Storage: A Combined Experimental and Simulation Approach
… the decarbonisation and decentralisation of the energy sector in the future. Installation numbers of building-integrated small-scale energy systems such as photovoltaics (PV), wind turbines and micro-combined heat and power (CHP) have significantly increased. However, the power output of PV and …
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Assessing the potential for renewable energy systems in remote arctic communities as a means of reducing regional diesel fuel dependence
… as diesel fuel, due to their need for a reliable energy source and supply. However, energy sources like diesel fuel worsen the climate change situation both within the Arctic as well as globally. Climate models for years have shown how a feedback loop exists between the Arctic and the rest of the …
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Electrical performance and economic feasibility analyses of hybrid and battery storage devices used in remote area islanded renewable energy systems
… irradiance exposure, which makes them ideal for Renewable Energy Systems (RES) but the electrical and economic viability of this deployment, is still in question. Based on these observations, an electrical performance analysis and economic feasibility study based on islanded RES deployment in …
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A multi-operational, combined PV/Thermal and solar air collector system: application, simulation and performance evaluation
… public awareness of environmental issues, more energy efficient buildings and renewable energy technologies are currently being developed and installed. Many of these renewable energy technologies may be considered as immature in market and technical terms, which has prompted significant levels …
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Nanoengineered surfaces for improvements in energy systems : application to concentrated solar and geothermal power plants
The main drawback to renewable energy systems is the higher cost of production compared to competitors such as fossil fuels. Thus, there is a need to increase the efficiency of renewable energy systems in an effort to make them more cost competitive. In this study, the use of nanosurfaces is …
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Applications of sustainable technology to retrofits in urban areas
Energy Losses from old buildings comprise a significant percentage of the total residential energy consumption in the United States. Retrofitting buildings for conservation can greatly decrease the present energy demand and help prevent an eventual depletion of the world's natural resources. This …
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European and German low-carbon energy transition
… possible pathways for the European and German energy transition. The open source Global Energy System Model (GENeSYS-MOD) is applied, a multisectoral long-term energy system model, to apply different methodologies accounting for uncertainty in the future energy system. With the goal of …
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Effects of blade configuration on flow distribution and power output of a zephyr vertical axis wind turbine.
Worldwide interest in renewable energy systems has increased dramatically, due to environmental concerns like climate change and other factors. Wind power is a major source of sustainable energy, and can be harvested using both horizontal and vertical axis wind turbines. This thesis presents …
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