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.
Results
Showing 1 to 20 of 63 for “"Transmission Network"”.
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Geomagnetically induced currents and its presence in the Eskom transmission network
… correlation. Finally, the modelling process of a network that would indicate its susceptibility to GICs was studied.Typical disruptions that would indicate the existence of GICs include Buchholz trips, interwinding faults, permanent failure due to internal faults, etc. From this investigation …
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Estimation of Geomagnetically Induced Currents (GICS) in the Namibian transmission network
… have become a matter of concern not only to networks located in high magnetic latitude regions but also in networks located in mid-latitude regions. GICs pose a threat of transmission equipment damage which could lead to short power interruptions and potentially long term blackouts. Improved …
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Value-based planning methodology for the restructuring and expansion of an electric utility sub-transmission network
… and expansion of an electrical sub-transmission network within the framework of Value-based planning. This methodology applies to typical municipal networks found in South Africa. A literature study indicates that most of the fundamental concepts for power system reliability is well …
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Development of an adaptive protection scheme for compensated transmission network with high level penetration of renewable energy sources
Submitted in fulfilment of the requirements of the degree of Doctor of Engineering in Electrical Engineering, Durban University of Technology, Durban, South Africa, 2024.
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Explaining Technological Change of Wind Power in China and the United States: Roles of Energy Policies, Technological Learning, and Collaboration
… US electricity market created heterogeneity in transmission network governance across regions. Thus, I add transmission network governance to my learning framework to test the impacts of different transmission network governance models. Using panel data of existing utility-scale wind farms in US …
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Two-Stage Fault Location Detection Using PMU Voltage Measurements in Transmission Networks
… location detection plays a crucial role in power transmission network, especially on security, stabilization and economic aspects. Accurate fault location detection in transmission network helps to speed up the restoration time, therefore, reduce the outage time and improve the system reliability …
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Improving Buffalo City's sub-transmission reliability
… and operational practices in Buffalo City's sub-transmission network. Primarily investigations on the field shows, aging infrastructure, relay failures and reactive maintenance practice is eminent. Inspired by these challenges, this dissertation proposes an analysis of the critical transition in …
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An Evaluation of Regulatory Frameworks for the Development of Interstate Hydrogen Infrastructure in the United States
… for the development of interstate hydrogen transmission infrastructure. This thesis combines qualitative and quantitative methods to assess the use of regulatory frameworks to enable the development of such an interstate hydrogen transmission network. I conduct a historical analysis of …
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The Role for Electricity Transmission in Net-Zero Energy Systems: A Spatially Resolved Analysis of the Continental US
… significant spatial variability and reliance on transmission infrastructure compared to existing fossil-fuel based energy systems, placing greater emphasis on transport and storage of material and energy. This case study evaluates pathways to a net-zero energy system in the continental US. To …
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Integration challenges for fast-charging infrastructure to support electric vehicle adoption
… Using a spatially resolved model of the power transmission network and a detailed market simulator, we characterize the effects of large-scale EV fast-charging on the Texas ERCOT system. We further explore three strategies to mitigate these effects -- energy storage colocation, network …
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A New Special Protection Scheme for Power System Controlled Separation
… the propagation of cascading failures across a transmission network should it undergoes a major disturbance, thereby reducing the possibility of a large-scale blackout. This scheme is developed based on a set of conjectures, which state the following: (i) the locations of out-of-step operations …
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Control of Power Flow in Transmission Lines using Distributed Series Reactors
… flow to more fully utilize the capacity of a transmission network, delaying investment in new transmission lines. In this study the IEEE 39 bus standard test system is modified to a 3-phase, unbalanced model consisting of 230 kV, 345 kV and 500 kV lines, where lines of different voltage run in …
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The effect of weather and climate change on the operation of meshed power networks
… of both the current effects of weather on power transmission systems and also, the future effects. It also applied this methodology to the GB transmission network as a test case to identify the outcomes interms of network reliability to possible changes in climate. To complete this analysis …
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Electricity security in a hydro-based electric power system : the particular case of Iceland
… due to weak infrastructure and overloading of transmission lines led to 600 million people temporarily having no electricity supply, and resulted in major disruptions in the transportation system, healthcare system, businesses, and even stranded coal miners (BRIEF, 2012). The International …
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Flexible AC transmission system compensation on a utility transmission system
… can be increased by the use of flexible AC Transmission System devices, FACTS, in transmission systems experiencing high power flows. This thesis presents an analysis of one of these devices, namely, a Thyristor Controlled Series Compensator, TCSC, as applied to the Nevada Power Company …
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A Novel Inverter Based Resource Control Strategy to Facilitate Utility-Scale Renewable Integration and Retain Existing Transmission Protection Infrastructure
… protection infrastructure for the North American transmission network was not designed with the behavior of these Inverter Based Resources (IBR) in mind. As IBR penetration continues to increase, the overall system behavior under faulted conditions may change to the point where protective relays …
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Circuit rating methods for high temperature cables
For the safe and efficient operation of power transmission systems, each system component must have an accurate current rating. Since the advent of formal power networks a wide variety of methods have been employed to calculate the current carrying capacity of power cables, ranging from simple …
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Simplified approach for the reliability estimation of large transmission and sub-transmission systems
… analyse the expected performance of a utility’s transmission and sub-transmission network. The software requires a physical network model to be constructed, representing all network components. A high level of accuracy is obtained using such software, but significant effort is required to create …
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Data-Driven Approaches for Enhancing Power Grid Reliability
… a prevalent problem in power distribution networks: the accurate identification of load phases. This study develops a data-driven model leveraging consumption measurements from smart meters and corresponding substation data to reconstruct topology information in low-voltage distribution …
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Wind farm simulation modelling and control
… regarding large integration of wind power to the transmission system including the maintenance of system stability due to the uncertain nature of wind power. Thus, the traditional way of operating and controlling wind turbines and wind power plants are becoming less acceptable. Furthermore, wind …
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