Oct 17, · Electric powersystems are one of the largest and more complex systems man has ever blogger.com importance of the services that power systems offer and the high amount ofinvestments that represent the facilities and equipments, make the normal and constantoperation of power systems critical and strategic for every society Doctoral Thesis, Research Collection Abstract. Across the world, the electric power systems are experiencing drastic changes mainly due to the technical improvements and cost reductions of technologies such as wind, solar, and batteries, the ambitious climate and energy targets (e.g., net-zero greenhouse gas emission, coal, and nuclear phase-out) Abstract. The research work presented in this thesis is concerned with the modelling of this new generation of power electronics controllers with a view to conduct comprehensive power systems harmonic analyses. An issue of paramount importance in this research is the representation of the self-commutated valves used by the controllers addressed in this work
Latest Thesis topics for Electrical Engineering (EEE)
Across the world, the electric power systems are experiencing drastic changes mainly due to the technical improvements and cost reductions of technologies such as wind, solar, and batteries, the ambitious climate and energy targets e. All these trends lead to the proliferation of distributed energy resources and contribute to transforming the traditional centralized power system into a more decentralized system.
However, both the phd thesis electrical power system nature of the variable generation and the gradual phase-out of favorable policies pose significant challenges to the operations and the investments of distributed energy resources. To better exploit the economic value of distributed energy resources, an aggregator is considered to enable their market participation and integrate the characteristics of diverse resources into a single entity.
The research question of phd thesis electrical power system would be the optimal dispatch and the optimal mix of distributed energy resources in a market environment is addressed. Constantly growing power demand and increasing penetration of renewable energy sources RES are pushing power grids to their limits. Due to importance of protection for reliable and safe operation of these grids, changes in their operating conditions necessitate the improvement of existing and development of new protection algorithms.
This work aims at addressing several challenges faced by protection of modern power grids. First, it focuses on improving performance of the first zone of conventional distance protection, which is widely used for transmission lines. In particular, the work tackles two shortcomings of this zone: limited coverage of internal faults due to the design of the zone characteristic, and further reduction of coverage in case of installed series compensation devices SCDs. This is accomplished by proposing an optimization-based algorithm for constructing an optimal first zone characteristic of distance protection for lines with and without SCDs.
The proposed algorithm ensures that the first zone has the maximum possible coverage of internal faults without compromising its security. Second, this work proposes a communication-assisted protection algorithm for medium-voltage lines that does not rely on any user-defined set-points, phd thesis electrical power system, in contrast to other existing protection algorithms. In addition, the algorithm inherently combines protection, fault location and fault type identification functionalities, which enables the unification of these closely related functions.
Lastly, this work proposes a protection algorithm that addresses the challenge of enabling economically efficient yet reliable protection of medium-voltage lines in grids with RES. It relies only on local measurements and enables simultaneous protection of all medium-voltage lines at a substation, which makes it a low-cost solution.
Moreover, the algorithm has high speed and is unaffected by the operation modes of RES as it is based on the traveling wave theory. Extensive simulation results demonstrate that the algorithms proposed in this work can potentially provide reliable protection of power lines in modern grids. The need to cope with the climate change challenge has given a strong impulse to promote energy produced by Renewable Energy Sources RESphasing out large plants based on fossil fuels in the transmission networks.
Some of the most notable developments foreseen in power systems target Distribution Networks DNs. In the future, DNs are expected to host a large percentage of distributed generators, including RES, to supply a growing share of the total demand.
These units, in combination phd thesis electrical power system other Distributed Energy Resources DERs such as electric vehicles, Battery Energy Storage Systems BESSs and Controllable Loads CLsare gradually elevating the role of Distribution System Operators DSOsallowing them to provide ancillary services and support the bulk transmission system.
However, this new paradigm introduces significant challenges to the DNs which were not designed to host generation, and are currently operating close to their physical limits, phd thesis electrical power system.
They face increased uncertainties due to intermittent RES generation and new consumption patterns which make the consumer response hard to predict.
Finally, bi-directional flows may trigger power quality issues, e. overvoltages, and the need to revise the protection schemes. The main scope of this dissertation is to develop methods to exploit the operational DER flexibility in every time frame of distribution systems in the most cost-effective way.
Emphasis phd thesis electrical power system put on optimal centralized approaches assuming perfect communication and monitoring infrastructure, and on robust and scalable purely local control strategies.
Furthermore, the thesis investigates ancillary service provision to higher voltage levels and reliability aspects based on protection and automation configurations. As active measures this dissertation considers Distributed Generator DG reactive power control and active power curtailment, BESSs, CLs and on-load-tap-changing transformers.
The BFS-OPF is tractable due to the iterative scheme nature and the efficient power flow calculation, guarantees AC feasible solutions, and is used as the core tool in the operation-aware grid planning stage, the operational planning stage under uncertainty, and the real-time operation of active DNs. The second part proposes and verifies experimentally data-driven methods to emulate the optimal response without the need for communication considering stability analysis of the closed-loop control strategies, phd thesis electrical power system.
Segmented and multiple linear regression, support vector machines for the regression and classification problems, as well as hierarchical and partition clustering approaches are used to derive the data-driven schemes and tackle scalability aspects. Finally, the third part develops OPF-based schemes to offer frequency control regulation considering islanding constraints and voltage support according to European market frameworks, as well as identify optimal protection and automation configurations by a brute-force and a genetic algorithm method.
This dissertation shows how advanced planning, operation, and control schemes in modern DNs can be used to tackle the challenges posed by the low-carbon future transformation efforts.
Active phd thesis electrical power system can defer costly investments, solve power quality issues, and unlock new business cases for DSOs. Reactive power control is recognized to have the largest flexibility potential in DNs, since it can minimize losses, mitigate voltage issues, tackle unbalances in multi-phase systems and provide voltage support to higher voltage level, phd thesis electrical power system, comprising the cheapest active measure.
With higher penetration of renewable generation and market liberalization, operating points of electric power systems become increasingly variable and less predictable. To ensure economically efficient and secure operation of such systems, fast and robust optimization algorithms are required.
Despite considerable research efforts, the development of these algorithms remains a challenge due to the nonlinearity and high dimensionality of system models. This dissertation focuses on the optimal power flow OPF problem, which is at the heart of techniques used in power system operation and planning.
As this problem is non-convex and highly nonlinear, modern solvers cannot always find its locally optimal or even feasible point. To address this issue, an approximation of the OPF problem is proposed that helps reduce its complexity without compromising the solution quality.
Moreover, phd thesis electrical power system, the obtained solution is guaranteed to be physically meaningful. Next, this work presents several computationally efficient techniques for strengthening convex relaxations of the OPF problem.
A tighter relaxation helps provide a better estimate of a globally optimal solution of the original problem phd thesis electrical power system recover a physically meaningful operating point, phd thesis electrical power system.
Lastly, this work presents several approaches to phd thesis electrical power system risk-based security indices in the OPF problem. To reduce the computational burden of solving the resulting problems, decomposition algorithms are employed. The proposed techniques were tested on grids of various sizes. The results demonstrate that these techniques can potentially help improve optimization tools used in power system operation.
This thesis is about the optimization of the Mid-Columbia hydropower system, which is comprised of seven cascaded hydropower projects on the Columbia River. It is the largest system of its kind in the United States, and it possesses unique qualities that make it useful to phd thesis electrical power system system operators and important for the integration of variable and intermittent 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 phd thesis electrical power system used to evaluate the potential benefits of real-time optimization with and without wind firming and hydro-wind coordination with day-ahead replanning and to estimate the battery-like properties of the Mid-Columbia system when it is used to balance wind variability, phd thesis electrical power system.
The system is simulated and tested using a multi-year wind and hydropower dataset that has been compiled from publicly available 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 to significant uncertainty. The primary factor inhibiting the performance of the hydropower battery was the maximum generation capacity of the hydropower system.
Press Enter to activate screen reader mode. Homepage Navigation Search Content Footer Contact Sitemap. PhD Theses Main content. publications of display all. Stochastic Investment and Dispatch Optimization of Distributed Energy Resources in a Market Environment.
Research Collection Abstract. Consumer Privacy and Smart Distribution Grids: A Cyber-Physical Ecosystem. DOI: Optimization - and Model - Based Methods for Protection of Power Lines. Towards reliable operation of converter-dominated power systems: Dynamics, optimization and control. Data-driven and Optimization-based Methods for Active Distribution Grids.
Optimization of Power System Operation: Approximations, Relaxations, and Decomposition. Optimization of the Mid-Columbia Hydropower System. On the Integration of Distributed Battery Storage in Low Voltage Grids. Storage in Power Systems: Frequency Control, Scheduling of Multiple Applications, and Computational Complexity. On Operational Flexibility in Transmission Constrained Electric Power Systems.
MSc Electrical Power Systems Engineering - Getting to Know the Course
, time: 43:16PhD Theses – Power Systems Laboratory | ETH Zurich
Master thesis: Electrical Design for an Electrical System of the Future Auteur: Marulli, Daniele These and other relevant problems requires drastic changes in the electric power industry. A better integration of renewables along the grid, smarter ways of managing it, reducing duce electricity and/or combine these with energy File Size: KB Phd Thesis On Power System Reliability - Thesis/Project Course Description - Electrical and Computer Engineering The qualifier exam results are separate from the grade Phd in the course; i. Electrical Exams are evaluated by a two-member committee for each of the courses, with the Thesjs for the current year acting as the head of the committee Oct 17, · Electric powersystems are one of the largest and more complex systems man has ever blogger.com importance of the services that power systems offer and the high amount ofinvestments that represent the facilities and equipments, make the normal and constantoperation of power systems critical and strategic for every society
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