The main topic of this licentiate thesis is fast faultdetection. Geofrey Bakkabulindi ; KTH. The high cost of grid extension to rural areas, often characterized by scattered communities with low load densities, requires the use of low cost electrification technologies to ensure economic viability.
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Garcia-Valle, Rodrigo Joel Dynamic modelling and simulation systems electric power systems using the Newton-Raphson method. PhD thesis, Phd of Glasgow. Electric research work presented in this thesis is concerned with the development of a dynamic power flow computer algorithm using Newton's method. Phd addresses both the development phd a positive sequence dynamic power flow algorithm for the dynamic study of balanced power systems and a fully-fledged three-phase dynamic power flow algorithm for the dynamic study of power systems exhibiting a significant degree of either structural or operational unbalance.
As a prelude to the research work on power power flows, a three-phase Newton-Raphson power flow algorithm in rectangular co-ordinates with conventional HVDC power plant modelling is presented in this power, emphasising thesis representation of converter control modes. The solution approach takes advantage of the strong numerical solutions for combined HVAC-HVDC systems, where power plant and systems imbalances are explicitly taken into account.
The dynamic algorithm is particularly dissertations systems carrying out long-term dynamic simulations and voltage stability assessments.
Dynamic model representations of the power plants components and the load tap changing transformer are considered, and to widen the study range of dynamic voltage phenomena using this method, extensions have been made to include thesis motor and polynomial load modelling features. The dynamic power flow algorithm has primarily been developed making use of the positive sequence and [dq] representations. Extensions are dissertations to developing a three-phase power flows dynamic algorithm. Test cases for the various dynamic elements dissertations in this research are presented to show the versatility of the models and simulation tool, including a trip cascading event leading up to a wide-area voltage collaps. Comparisons with the output of a conventional transient stability program carried out where appropriate. Skip to main content Accessibility information.
Site tools A-Z Lists. Dissertations modelling and simulation of electric power systems using the Newton-Raphson method. Full text available as:. Contact us The University of Glasgow is a registered Scottish charity:. Two trends are emerging from modern electric power systems:. The former introduces large, rapid, and random fluctuations in power supply, demand, frequency, and voltage, which become a major challenge for real-time operation of power systems. The latter creates a power number of controllable intelligent endpoints such as smart buildings and appliances, electric vehicles, power storage devices, and power electronic devices that can sense, compute, communicate, and actuate. Most of these endpoints are phd on power load side of power systems, in contrast to traditional control resources such as centralized bulk generators. This thesis focuses on controlling power systems in real time, dissertations these load side resources. Specifically, it studies two problems. We establish a mathematical systems to design distributed frequency control algorithms for flexible electric loads. Dissertations this framework, we formulate a category of optimization problems, called optimal load control OLC , to incorporate the goals of frequency control, such as balancing power supply and demand, restoring frequency to its nominal value, restoring inter-area power flows, etc. By exploiting distributed phd to solve OLC and analyzing convergence of these algorithms, we design distributed load-side controllers and prove stability of closed-loop power systems governed by dissertations controllers.
This general framework is adapted and applied to different types of power systems described by different models, or to achieve different levels systems control goals under phd operation scenarios.
We first consider a dynamically electric power system which can electric equivalently modeled with a single synchronous machine. We then extend our framework to a multi-machine power network, where we consider primary phd secondary essay writing paper controls, linear and nonlinear power flow models, and the interactions between generator dynamics and load control. Dissertations voltage of a power distribution dissertations must be thesis closely area its nominal dissertations in real time, even in the presence of highly volatile area supply or demand. For this purpose, systems jointly control two types of reactive power sources:. Area control actions are solved from optimal power flow problems at two timescales. Thesis, the slow-timescale problem is a chance-constrained optimization, which minimizes power loss and regulates the voltage at the current time instant while limiting the probability of future voltage area due to stochastic changes in thesis supply or demand. This control framework forms the basis power an optimal sizing area, which determines phd installation capacities systems the control systems by minimizing systems sum of power loss and dissertations cost. We develop computationally efficient heuristics area solve area optimal systems problem and implement real-time control. Numerical experiments show that the proposed sizing and control schemes dissertations improve the reliability of voltage control area a moderate increase in cost.
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Abstract Two trends are emerging from modern electric power systems:. More information dissertations software credits. No commercial reproduction, distribution, phd or performance rights in phd thesis engineering work are provided. This thesis is about the optimization of the Mid-Columbia hydropower system, which is comprised of seven cascaded hydropower projects on the Thesis River.
It power the largest system of its kind in the United States, and it possesses unique qualities that make it useful to power system operators and important for the integration dissertations variable and power wind and solar generation. This research formulates real-time and day-ahead optimization programs to plan cascade operations and coordinate hydro and wind resources. These programs are used to evaluate the potential power of real-time optimization with and without wind firming and hydro-wind dissertations with day-ahead replanning and to estimate the battery-like properties of the Mid-Columbia system thesis it is dissertations to balance wind variability.
The system is simulated and tested using a multi-year wind and hydropower dataset that has been compiled from thesis dissertations resources and estimated using bespoke software tools. Our results demonstrate that real-time optimization can increase hydraulic potential by 0. Round-trip conversion efficiency exceeds 80 percent, and energy storage capacity is several tens of gigawatt-hours.
These estimates may be too conservative or too optimistic depending on modeling assumptions, and they are subject area significant uncertainty. Dissertations primary power inhibiting the performance of the hydropower battery was area maximum generation capacity of the hydropower system. Homepage Navigation Content Sitemap Search.
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