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Dissertations / Theses on the topic 'System Stability enhancement methods'

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Published: 4 June 2025

Last updated: 1 August 2025

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1

Li, Tianya. "Electromechanical wave propagation phenomenon and its control implications in power systems." Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/95962/1/Tianya_Li_Thesis.pdf.

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This thesis investigates advanced control methods and strategies to enhance the transient stability of a power system which is affected by the electromechanical wave propagation phenomenon. The characteristics of the travelling wave phenomenon and its impact on system separation during first swing are investigated in detail. This thesis identifies four innovative control implications for power system stability and proposes an improved method to enhance power system transient stability. By designing better control of existing equipment, this research achieves increased maximum power transfer un

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2

Zhang, Tan. "Adaptive Energy Storage System Control for Microgrid Stability Enhancement." Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-dissertations/190.

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Microgrids are local power systems of different sizes located inside the distribution systems. Each microgrid contains a group of interconnected loads and distributed energy resources that acts as a single controllable entity with respect to the grid. Their islanding operation capabilities during emergencies improve the resiliency and reliability of the electric energy supply. Due to its low kinetic energy storage capacity, maintaining microgrid stability is challenging under system contingencies and unpredictable power generation from renewable resources. This dissertation highlights the pote

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Ali, Muhammad. "Power System Stability Enhancement through Data Center Ancillary Services." Diss., North Dakota State University, 2015. https://hdl.handle.net/10365/27636.

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The primary objective of a control system is stability and steady-state performance under varying dynamics, such as faults and disturbances. The stable power system should continue to function properly in case of faults and disturbances. Stability of the power systems find applications in various domains, such as power delivery through Permanent Magnet Synchronous Generator (PMSG), Doubly-Fed Induction Generator (DFIG), and data centers. The goal of this dissertation is to design a robust control for a power system. We propose a hybrid Fault-Ride-Through (FRT) strategy for DFIG and two new PMS

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朱太秀 and Tai-xiu Zhu. "Knowledge-based assessment and enhancement of voltage stability." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31236455.

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Zhu, Tai-xiu. "Knowledge-based assessment and enhancement of voltage stability /." Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B18061680.

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6

Behbehani, Hussain M. "Enhancement of power system stability using fuzzy logic based supervisory power system stabilizer." Thesis, University of Edinburgh, 2008. http://hdl.handle.net/1842/10778.

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Maintaining power system stability has become a challenging task for engineers. A consequence of such factors is that power system damping of electro-mechanical oscillations is often reduced which could sometimes destabilise the power systems if the electro-mechanical oscillations are poorly/lightly damped. Decentralised power system stabilisers are often used to increase damping of local oscillation modes and to some extent to increase damping of inter-area oscillation modes. However, damping of inter-area oscillations modes by the local PSS is not quite effective as for local oscillation mod

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Almutairi, Abdulaziz. "Enhancement of power system stability using wide area measurement system based damping controller." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/enhancement-of-power-system-stability-using-wide-area-measurement-system-based-damping-controller(7d98d164-8051-4662-ad18-374620d28a00).html.

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Contemporary power networks are gradually expanding incorporating new sources of electrical energy and power electronic based devices. The major stability issue in large interconnected power systems is the lightly damped interarea oscillations. In the light of growth of their incidents there are increased concerns about the effectiveness of current control devices and control systems in maintaining power system stability. This thesis presents a Wide Area Measurement System (WAMS) based control scheme to enhance power system stability. The control scheme has a hierarchical (two-level) structure

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Gade, Prasad V. N. "Performance Enhancement and Stability Robustness of Wing/Store Flutter Suppression System." Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/30339.

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In recent years, combat aircraft with external stores have experienced a decrease in their mission capabilities due to lack of robustness of the current passive wing/store flutter suppression system to both structured as well as unstructured uncertainties. The research program proposed here is to investigate the feasibility of using a piezoceramic wafer actuator for active control of store flutter with the goal of producing a robust feedback system that demonstrates increased performance as well as robustness to modeling errors. This approach treats the actuator as an active soft-decoup

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9

Salih, Embaiya. "Superconducting magnetic energy storage for power system stability and quality enhancement." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2018. https://ro.ecu.edu.au/theses/2084.

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The stability of power systems has become the most critical issue affecting their quality and performance. Concerns over climate change are now moving the energy sector into a new era of modern power grids. To sustain the reliable operation of power systems and improve the quality of power generation, several instability issues that affect the quality of the operation of power systems are addressed in this thesis. The first is the fluctuations in generated power due to variations in wind velocity in wind power systems. The fluctuation in the wind, which is the main energy source in a wind powe

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10

Cai, Hui. "Enhancement of power system dynamic stability using electric vehicles and distributed generation." Thesis, Queen's University Belfast, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.602450.

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This thesis proposes a method to establish the accurate parameters of stabilisers in the context of power systems with increasing penetration of Doubly Fed Induction Generators (DFIGs), Solid Oxide Fuel Cells (SOFCs) and Photovoltaic (PVs) using a hierarchical coordinated strategy and localised design. The performance of the tuned stabilisers is verified using modal analysis results and non-linear simulation. This thesis proposes that by using regulated stabilisers, the dynamic stability of a power system with large-scale Distributed Generation (DG) integration can be maintained. SmartParks ha

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11

Bricker, Garrett Demyan. "Analytical Methods of Testing Solid Waste and Leachate to Determine Landfill Stability and Landfill Biodegradation Enhancement." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/35162.

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This was a study undertaken to investigate municipal solid waste (MSW) landfill stability parameters and landfill leachate properties to determine how solid waste and leachate characteristics can be used to describe stability. The primary objective was to determine if leachate properties could be used to determine stability of the overlying refuse. All landfills studied were engineered landfill bioreactors giving insight to how leachate recirculation affects stability. This study investigated the correlation between cellulose, lignin, volatile solids, and biochemical methane production (BMP)

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12

Bedoya, Ceballos Juan Carlos. "Optimization Methods for Distribution Systems: Market Design and Resiliency Enhancement." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/99489.

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The increasing penetration of proactive agents in distribution systems (DS) has opened new possibilities to make the grid more resilient and to increase participation of responsive loads (RL) and non-conventional generation resources. On the resiliency side, plug-in hybrid electric vehicles (PHEV), energy storage systems (ESS), microgrids (MG), and distributed energy resources (DER), can be leveraged to restore critical load in the system when the utility system is not available for extended periods of time. Critical load restoration is a key factor to achieve a resilient distribution system.

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13

Amy, John Victor. "Composite system stability methods applied to advanced shipboard electric power systems." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/10945/23576.

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CIVINS<br>Large increases in the complexity of shipboard electric loads as well as development of electric drive, integrated electric drive and pulsed power systems make manifest the present and future importance of naval electric power systems. The most crucial attribute of these systems is their ability to fulfill their function in the presence of "large-signal" perturbations. Fundamental differences between shipboard and commercial electric power systems make all but the most general nonlinear, "large-signal" stability analyses inappropriate for the design and assessment of naval electric p

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14

Joseph, Tibin. "Operation and control of voltage source converters in transmission networks for AC system stability enhancement." Thesis, Cardiff University, 2017. http://orca.cf.ac.uk/111498/.

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The rapid expansion in power transmission for the integration of large-scale renewables is foreseen in the future. This will be complemented by infrastructure reinforcements in the form of series compensation and high-voltage direct current (HVDC) links. These changes will bring forth new operability challenges to grid operators. The stability issues pertained to such reinforcements: potential threat of subsynchronous resonance (SSR) and frequency regulation will be investigated in this thesis. Utilising the existing and future voltage source converters (VSC) based HVDC links to support the AC

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15

Togiti, Varun. "Pattern Recognition of Power System Voltage Stability using Statistical and Algorithmic Methods." ScholarWorks@UNO, 2012. http://scholarworks.uno.edu/td/1488.

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In recent years, power demands around the world and particularly in North America increased rapidly due to increase in customer’s demand, while the development in transmission system is rather slow. This stresses the present transmission system and voltage stability becomes an important issue in this regard. Pattern recognition in conjunction with voltage stability analysis could be an effective tool to solve this problem In this thesis, a methodology to detect the voltage stability ahead of time is presented. Dynamic simulation software PSS/E is used to simulate voltage stable and unstable ca

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16

Praprost, Kenneth Lee. "Power system stability and security methods with applications to restorative state operation." Case Western Reserve University School of Graduate Studies / OhioLINK, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=case1060190618.

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17

Zhou, Ning. "Subspace methods of system identification applied to power systems." Laramie, Wyo. : University of Wyoming, 2005. http://proquest.umi.com/pqdweb?did=1095432761&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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18

Llamas, Armando. "Assessment of direct methods in power system transient stability analysis for on-line applications." Diss., Virginia Polytechnic Institute and State University, 1992. http://hdl.handle.net/10919/49933.

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The advent of synchronized phasor measurements allows the problem of real time prediction of instability and control to be considered. The use of direct methods for these on-line applications is assessed. The classical representation of a power system allows the use of two reference frames: Center of angle and one machine as reference. Formulae allowing transition between the two reference frames are derived. It is shown that the transient energy in both formulations is the same, and that line resistances do not dampen system oscillations. Examples illustrating the mathematical characterizat

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19

Kim, Yuan Hwan. "Lactate dehydrogenase regulation of the metmyoglobin reducing system to improve color stability of bovine muscles through lactate enhancement." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2966.

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20

Amir, Taher Kolar. "Comparison of numerical methods for solving a system of ordinary differential equations: accuracy, stability and efficiency." Thesis, Mälardalens högskola, Akademin för utbildning, kultur och kommunikation, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-48211.

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In this thesis, we compute approximate solutions to initial value problems of first-order linear ODEs using five explicit Runge-Kutta methods, namely the forward Euler method, Heun's method, RK4, RK5, and RK8. This thesis aims to compare the accuracy, stability, and efficiency properties of the five explicit Runge-Kutta methods. For accuracy, we carry out a convergence study to verify the convergence rate of the five explicit Runge-Kutta methods for solving a first-order linear ODE. For stability, we analyze the stability of the five explicit Runge-Kutta methods for solving a linear test equat

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21

Genet, Benjamin. "On monitoring methods and load modeling to improve voltage stability assessment efficiency." Doctoral thesis, Universite Libre de Bruxelles, 2009. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210258.

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Power systems must face new challenges in the current environment. The energy market liberalization and the increase in the loading level make the occurrence of instability phenomena leading to large blackouts more likely. Existing tools must be improved and new tools must be developed to avoid them.<p><p>The aim of this thesis is the improvement of the voltage stability assessment efficiency. Two orientations are studied: the monitoring methods and the load modeling.<p><p>The purpose of the monitoring methods is to evaluate the voltage stability using only measurements and without running sim

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22

Deladisma, Marnico David. "Accuracy and Enhancement of the Lattice Boltzmann Method for Application to a Cell-Polymer Bioreactor System." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/10546.

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Articular cartilage has a limited ability to heal due to its avascular, aneural, and alymphatic nature. Currently, there is a need for alternative therapies for diseases that affect articular cartilage such as osteoarthritis. Recently, it has been shown that tissue constructs, which resemble cartilage in structure and function, can be cultured in vitro in a cell-polymer bioreactor system. Bioreactors provide a three dimensional environment that promotes cell proliferation and matrix production. The primary objective of this study is to accurately simulate fluid mechanics using the lattice

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23

Dong, Zhao Yang. "Advanced methods for small signal stability analysis and control in modern power systems." Phd thesis, School of Electrical and Information Engineering, Graduate School of Engineering, 1998. http://hdl.handle.net/2123/6416.

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24

Yazdani, Atousa. "Energy and voltage management methods for multilevel converters for bulk power system power quality improvement." Diss., Rolla, Mo. : Missouri University of Science and Technology, 2009. http://scholarsmine.mst.edu/thesis/pdf/Yazdani_09007dcc805c8ecd.pdf.

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Thesis (Ph. D.)--Missouri University of Science and Technology, 2009.<br>Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed February 18, 2009) Includes bibliographical references.

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Chen, Liang-kuang. "Describing function methods for the analysis of stability and performance of repetitive control of servohydraulic systems." The Ohio State University, 1996. http://rave.ohiolink.edu/etdc/view?acc_num=osu1102102812.

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26

Wissocq, Gauthier. "Investigation of lattice Boltzmann methods for turbomachinery secondary air system simulations." Thesis, Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0635.

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Ce manuscrit présente une étude du potentiel des méthodes lattice Boltzmann pour traiter des écoulements circulant dans les systèmes de refroidissement des turbomachines. La combinaison de phénomènes physiques complexes donne naissance à des structures instationnaires, non-axisymmétriques et de période a priori inconnue. Leur bonne modélisation représente un défi pour la simulation numérique en mécanique des fluides. Ce travail peut être divisé en trois sous-parties. Une étude physique des instabilités à l'origine des structures tourbillonnaires est d'abord effectuée par analyse de stabilité l

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27

Rajaguru, Mudiyanselage Thilanki Maneesha Dahigamuwa. "Enhancement of Rainfall-Triggered Shallow Landslide Hazard Assessment at Regional and Site Scales Using Remote Sensing and Slope Stability Analysis Coupled with Infiltration Modeling." Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7562.

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Landslides cause significant damage to property and human lives throughout the world. Rainfall is the most common triggering factor for the occurrence of landslides. This dissertation presents two novel methodologies for assessment of rainfall-triggered shallow landslide hazard. The first method focuses on using remotely sensed soil moisture and soil surface properties in developing a framework for real-time regional scale landslide hazard assessment while the second method is a deterministic approach to landslide hazard assessment of the specific sites identified during first assessment. In t

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Edens, Thaddeus James. "A new large total variation stability result for the quadratic nonlinear system associated with the compressible Euler equations by eigenvalue methods /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2003. http://uclibs.org/PID/11984.

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Ahmed, Hasim Abdalla Obaid. "Construction and analysis of efficient numerical methods to solve Mathematical models of TB and HIV co-infection." Thesis, University of the Western Cape, 2011. http://etd.uwc.ac.za/index.php?module=etd&action=viewtitle&id=gen8Srv25Nme4_3704_1325661141.

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In this thesis, we study these models and design and analyze robust numerical methods to solve them. To proceed in this direction, first we study the sub-models and then the full model. The first sub-model describes the transmission dynamics of HIV that accounts for behavior change. The impact of HIV educational campaigns is also studied. Further, we explore the effects of behavior change and different responses of individuals to educational campaigns in a situation where individuals may not react immediately to these campaigns. This is done by considering a distributed time delay in the HIV s

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Nunez, Lopez Lidia. "Electoral system stability and change: an analysis of the barriers and incentives to reform in European democracies since 1945." Doctoral thesis, Universite Libre de Bruxelles, 2015. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209101.

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Electoral systems have an enormous importance on how political power is distributed, on governability and the dynamics of representation of any given democratic society. Political science has traditionally considered electoral systems to be stable institutions and has paid more attention to understand how political parties adapt to the electoral rules than to how “electoral institutions themselves are adapted by political parties” (Benoit 2004). However, given their importance, unveiling the factors that influence the change and the choice of electoral rules is crucial and an increasing number

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Huynh, Nguyen. "Digital control and monitoring methods for nonlinear processes." Link to electronic thesis, 2006. http://www.wpi.edu/Pubs/ETD/Available/etd-100906-083012/.

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Dissertation (Ph.D.)--Worcester Polytechnic Institute.<br>Keywords: Parametric optimization; nonlinear dynamics; functional equations; chemical reaction system dynamics; time scale multiplicity; robust control; nonlinear observers; invariant manifold; process monitoring; Lyapunov stability. Includes bibliographical references (leaves 92-98).

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Wit, Julien de, Nikole K. Lewis, Heather A. Knutson, et al. "Planet-induced Stellar Pulsations in HAT-P-2's Eccentric System." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/624378.

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Extrasolar planets on eccentric short-period orbits provide a laboratory in which to study radiative and tidal interactions between a planet and its host star under extreme forcing conditions. Studying such systems probes how the planet's atmosphere redistributes the time-varying heat flux from its host and how the host star responds to transient tidal distortion. Here, we report the insights into the planet-star interactions in HAT-P-2's eccentric planetary system gained from the analysis of similar to 350 hr of 4.5 mu m observations with the Spitzer Space Telescope. The observations show no

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Nduku, Nyaniso Prudent. "Development of methods for distribution network power quality variation monitoring." Thesis, Cape Peninsula University of Technology, 2009. http://hdl.handle.net/20.500.11838/1144.

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Thesis (MTech (Electrical Engineering))--Cape Peninsula University of Technology, 2009<br>The purpose of this project is to develop methods for distribution network power quality' variations monitoring. Power quality (PO) has become a significant issue for both power suppliers and customers. There have been important changes in power system regarding to power quality requirements. "Power quality" is the combination at voltage quality and current quality. The main research problem of the project is to investigate the power quality of a distribution network by selection of proper measuremen

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Borra, Chaitanya. "DYNAMICS OF LARGE ARRAY MICRO/NANO RESONATORS." University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1590758736333883.

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Кунченко, Тетяна Юріївна. "Параметрична оптимізація умовно стійких електромеханічних систем методом діаграм якості керування". Thesis, НТУ "ХПІ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21345.

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Дисертація на здобуття наукового ступеня кандидата технічних наук за спеціальністю 05.09.03 – електротехнічні комплекси та системи. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2016. Дисертація присвячена визначенню і дослідженню задач оптимізації параметрів астатичних регуляторів багатократноінтегруючих систем з використанням мінімаксних критеріїв оптимізації. Виконано аналіз способів параметричної оптимізації та підвищення ефективності керування умовно стійкими багатократноінтегруючими електромеханічними системами (ЕМС) методом діаграм якості керування.

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Кунченко, Татьяна Юрьевна. "Параметрическая оптимизация условно устойчивых электромеханических систем методом диаграмм качества управления". Thesis, НТУ "ХПИ", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/21350.

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Диссертация на соискание ученой степени кандидата технических наук по специальности 05.09.03 – Электротехнические комплексы и системы. – Национальный технический университет "Харьковский политехнический институт", Харьков, 2016 г. Диссертация посвящена исследованию и решению задач оптимизации параметров астатических регуляторов многократноинтегрирующих систем с использованием минимаксных критериев оптимизации. Выполнен анализ способов параметрической оптимизации и повышения эффективности управления условно устойчивыми многократно интегрирующими электромеханическими системами методом диаграмм

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Abate, Domenico. "Modelling and control of RFX-mod tokamak equilibria." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3421955.

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The subject that concerns this thesis is the modelling and control of plasma equilibria in the RFX-mod device operating as shaped tokamak. The aim was to develop an overall model of the plasma-conductors-controller system of RFX-mod shaped tokamak configuration for electromagnetic control purposes, with particular focus on vertical stability. Thus, the RFX-mod device is described by models of increasing complexity and involving both theoretical and experimental data. The CREATE-L code is used to develop 2D linearized plasma response models, with simplifying assumptions on the conducting struct

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Mauro, Filho Sebastião. "Método perturbativo aplicado a gravidade de quarta ordem e a relatividade geral corrigida pelo grupo de renormalização." Universidade Federal de Juiz de Fora (UFJF), 2017. https://repositorio.ufjf.br/jspui/handle/ufjf/5526.

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Submitted by isabela.moljf@hotmail.com (isabela.moljf@hotmail.com) on 2017-08-09T11:18:45Z No. of bitstreams: 1 sebastiaomaurofilho.pdf: 637836 bytes, checksum: 0629945b7a9ce79385454dd5fb18c92f (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2017-08-09T13:36:52Z (GMT) No. of bitstreams: 1 sebastiaomaurofilho.pdf: 637836 bytes, checksum: 0629945b7a9ce79385454dd5fb18c92f (MD5)<br>Made available in DSpace on 2017-08-09T13:36:52Z (GMT). No. of bitstreams: 1 sebastiaomaurofilho.pdf: 637836 bytes, checksum: 0629945b7a9ce79385454dd5fb18c92f (MD5)

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Дарієнко, О. В., О. В. Дариенко та O. Darienko. "Діагностування стійкості функціонування підприємств малого бізнесу". Diss., Одеський національний економічний університет, 2013. http://dspace.oneu.edu.ua/jspui/handle/123456789/3973.

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На основі комплексного дослідження теоретичних основ забезпечення стійкості функціонування підприємств малого бізнесу, методів та моделей діагностування стійкості функціонування малих та середніх підприємств розроблено теоретико-методичні засади і практичні рекомендації щодо обгрунтування вибору дігностування стійкості функціонування підприємств малого бізнесу. Найважливішим результатом, що характеризується новизною й аргументованістю є те, що в роботі надано нове рішення в розробці механізмів управління стійким функціонуванням підприємства на базі системно-праксеологічного підходу, на основі

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Tomešková, Dagmar. "Hodnocení finanční situace podniku a návrhy na její zlepšení." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2011. http://www.nusl.cz/ntk/nusl-223173.

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The subject of the dissertation is a financial analysis of an enterprise and following overall assessment of financial condition of the company during 2006 - 2009. The design part of the dissertation is focused on development and streamlining of enterprise management and individual proposals are concentrated mainly on optimization of reserves and investment in the area of production technologies.

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Lazzaretti, André Eugenio. "Segmentação, classificação e detecção de novas classes de eventos em oscilografias de redes de distribuição de energia elétrica." Universidade Tecnológica Federal do Paraná, 2015. http://repositorio.utfpr.edu.br/jspui/handle/1/1144.

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CAPES<br>Este trabalho apresenta novas abordagens para duas das etapas fundamentais relacionadas com análise automática de oscilografias de redes de distribuição: a detecção dos instantes transitórios e a sua classificação. Para comparação e validação dos métodos são utilizadas duas bases de dados, sendo uma delas formada por dados simulados no aplicativo Alternative Transient Program e outra contendo dados reais de oscilógrafos instalados em uma rede de distribuição de energia elétrica. Os dados reais apresentam um conjunto de eventos relevante para as análises aqui propostas, principalmente

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Mraidi, Ramzi. "Modélisation et contrôle de la transmission du virus de la maladie de Newcastle dans les élevages aviaires familiaux de Madagascar." Thesis, La Réunion, 2014. http://www.theses.fr/2014LARE0014.

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La maladie de Newcastle (MN) grève lourdement les productions aviaires malgaches, essentielles à l'alimentation et à l'économie familiales. La MN est une dominante pathologique en l'absence de vaccination généralisée. L'objectif de cette thèse est la modélisation, la validation et l'analyse mathématique de modèles de transmission du virus de la MN (VMN) dans les systèmes avicoles villageois en général et à Madagascar en particulier. Nous proposons de nouveaux modèles basés sur les connaissances actuelles de l'histoire naturelle de la transmission du VMN. Ainsi, nous présentons deux modèles mat

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Perez, Filipe. "Control of AC/DC Microgrids with Renewables in the Context of Smart Grids : Including Ancillary Services and Electric Mobility." Electronic Thesis or Diss., université Paris-Saclay, 2020. http://www.theses.fr/2020UPASG011.

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Les Microgrids sont une excellente solution aux problèmes actuels soulevés par la croissance constante de la demande de charge et la forte pénétration des sources d’énergie renouvelables, qui se traduisent par une modernisation du réseau grâce au concept de “Smart-Grids”. L’impact des sources d’énergie distribuées basées sur l’électronique de puissance est une préoccupation importante pour les systèmes d’alimentation, où la régulation naturelle de la fréquence du système est entravée en raison de la réduction de l’inertie. Dans ce contexte, les réseaux à courant continu (CC) sont considérés co

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Ganacim, Júlio César Secolo. "Estudo do controle com Feedforward de potência e realimentação direta aplicado ao retificador Boost Bridgeless com alto fator de potência." Universidade Tecnológica Federal do Paraná, 2014. http://repositorio.utfpr.edu.br/jspui/handle/1/1154.

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Neste trabalho é apresentado um estudo de controladores aplicados a retificadores boost pré reguladores de alto fator de potência. A estratégia convencional, mais utilizada, é o controle por valores médios instantâneos que apresenta uma malha de corrente rápida e uma malha de tensão lenta. A frequência de corte desta última malha é baixa devido a ondulação de tensão de saída no dobro da frequência da rede que deve existir para apresentar uma corrente de entrada com baixa distorção harmônica. Esses controles apresentam um sobressinal elevado e transição lenta durante transitórios de carga, leva

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Романенко, Віталій Юрійович. "Удосконалення системи управління фінансовою безпекою підприємства". Магістерська робота, Київський національний університет технологій та дизайну, 2021. https://er.knutd.edu.ua/handle/123456789/19304.

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Дипломну магістерську роботу присвячено дослiдженню теоретичних аспектів та розробці пропозицій щодо удосконалення системи управління фiнансовою безпекою пiдприємства. За результататми аналізу фінансового стану та оцінювання рівня фiнансової безпеки ТОВ "ДАЙРЕКС" розроблено заходи щодо удосконалення системи управління фінансовою безпекою досліджуваного підприємства. Обгрунтовано основнi напрями побудови ефективної системи управління фiнансовою безпекою ТОВ "ДАЙРЕКС" на засадах моніторингу. Визначено заходи щодо підвищення рiвня фiнансової безпеки ТОВ "ДАЙРЕКС".<br>Дипломная магистерская работа

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Tsai, Ming-Chih, and 蔡明志. "Preventive and Enhancement Control of Voltage Stability Problems in Power Systems Using Linear Programming Methods." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/38126273997865013209.

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碩士<br>國立清華大學<br>電機工程學系<br>101<br>Voltage stability occurs when power systems suffered severe contingency or unpredicted load increasing. In order to quantity to voltage instability, the concept of the loading margin has been proposed to measure the distance from the current operating point to the voltage collapse point. This thesis will study preventive and enhancement control actions via the sequential linear programming(SLP) techniques enhance the load margin. The prototype simulation program for preventive control and enhancement control has been implemented in Matlab. The entire program co

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Liu, Chuan Sheng, and 劉傳聖. "Excitation system identification and power system dynamic stability enhancement." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/44995610095729487814.

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Griffo, Antonio. "Novel FACTS controllers for power system stability enhancement." Tesi di dottorato, 2007. http://www.fedoa.unina.it/1541/1/Griffo_Ingegneria_Elettrica.pdf.

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Sun, San-Yung, and 孫善勇. "The Dynamic Stability Enhancement of Power System Incorporating STATCOM." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/35875516783495588832.

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碩士<br>輔仁大學<br>電子工程學系<br>89<br>This paper solves the problem of power system stabilization by using the advanced static VAR compensator (STATCOM) to increase the damping of the electromechanical mode of the power system. The dynamic oscillations are repressed by the proposed STATCOM controller, which is an output feedback controller designed by the strip poles assignment method. The controller is reliable and can guarantee a vertical strip that the electromechanical mode will fall into. We will study the effect of this component in single machine and multi-machine power system and design an out

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Dien, Doan Van, and 阮凡田. "Analysis and Enhancement of Stability for Longitudinal Power System." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/84443294418866766409.

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博士<br>國立臺灣海洋大學<br>電機工程學系<br>101<br>Modern power systems bring many benefits but they may also contain many potential problems such as low-frequency oscillations which threat the system stability as well as limited power transfer capacity of the system. Spontaneous low-frequency oscillations are potential to occur in the exchange of regional power flow under normal operation, especially in the operation of an interconnected power system with a longitudinal network structure. The inter-area oscillations often have features of being low frequency, lightly damped, and affecting relatively more gen

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