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Singh, Gurinder Pal. "Power system stability". Thesis, Singh, Gurinder Pal (2018) Power system stability. Honours thesis, Murdoch University, 2018. https://researchrepository.murdoch.edu.au/id/eprint/44793/.
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In order to understand the stability it is essential to become familiar with the basic operations of a power system. There are three main components of a power system i.e. generation, transmission and distribution. Electrical power is generated mostly from synchronous machines. The primary sources of energy (fossil, hydraulic) are converted into mechanical energy through prime movers. Mechanical energy is used by synchronous generators to produce electrical power and most of the electric power systems are three phase AC systems operating at constant voltage. Three phase equipment is also used by generation and transmission facilities along with industrial residential and commercial loads that are equally distributed among all the phases to form a three‐phase balanced system [1]. A power system entirely relies upon its voltage, frequency and rotor angle stability. The main causes behind the instabilities, analysis techniques and methods used to improve the overall system stability will be discussed in this report.
This report will explore the main aspects of power system instabilities by reviewing existing literature, analysing through simulation and finally correcting the grid instability with regard to voltage, frequency, and rotor angle. A small nine bus transmission network using Power Factory to analyse and match the theoretical factors that determine the reliability and operation as mentioned in current literature. The Power Factory provides numerous inbuilt global models of Automatic voltage regulator (Avr), Governor and Turbine (Gov), and power system stabilizer (PSS) etc. to reduce the complexity and avoid building the differential functions from scratch. The system will be analysed under four random avr and gov models by introducing a three‐phase fault at one of the transmission lines. The response of one of the generator will be examined on the basis of its variables like rotor angle, speed, output powers, terminal and excitation voltages. The ideal combination of avr and gov will be used to carry out PV and QV curve analysis to find the weakest bus in the system. Lastly, the performance of that bus will be analysed by varying the load and reactive power compensation. Stability of the system will be enhanced by using various Avr, Gov models through testing pre‐existing parameters.
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Mensah, Kwaku Sarpong. "Improving Stability of Ghana's Power System Using Power System Stabiliser(PSS)". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12884.
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Stability of a power system is vital for its reliable operation and maintaining system stability has been a big challenge for engineers over the years. One way of improving system stability is the use of power system stabiliser (PSS). Its main function is to add damping to the generator rotor oscillation by modulating the generator excitation so as to develop a component of electrical torque in phase with the rotor speed deviation. In Ghana, two power stations have their generators equipped with PSS but none of the PSS are activated. The main objective of this study is to assess how the stability of the power system of Ghana can be improved by activating the power system stabilizers (PSS) on the excitation system of some of the generating units. To effectively perform the study the following questions had to be answered.To what extent will the activation of the PSS on some generating units affect the overall system dynamic performance?Where in the power system should the PSS be activated?To what extend can the PSS reduces system oscillation? What improvement can be made to the power system to optimise the performance of the PSS?Data of Ghana and the interconnected systems were first collected, reviewed and all the systems were modelled using PSSE program. Steady state stability studies were then performed to identify the inadequacy in the system during steady state operations. Five base cases including peak and average load condition with and without contingency were used for this study. Dynamic stability studies were also carried out by selecting appropriate dynamic models for generators, exciters and governors that best fit the dynamic behaviour of the generating units in the PSSE program. Appropriate PSS models were selected for units equipped with PSS based on manufacturers recommendation. Series of dynamic simulations were carried out to identify the best location and parameter settings for the PSS. Small signal stability studies were also carried out to complement the results obtained from the transient studies using NEVA. There was however a defect in the NEVA program and full results could not be obtained.In conclusion, Ghanas system is likely to experience voltage collapse during a transmission outage on some critical lines at peak period unless some loads are shed. This risk can be reduced by improving the power factor to 0.95 using more reactive power compensating devices (capacitor bank) at the local substation. Transient stability results also show that the best location for the PSS to effectively damped oscillation is Akosombo GS. Inter-area oscillations of 0.5Hz between Ghana and Ivory Coast systems, local-area oscillation of 0.8Hz between the Akosombo units and Aboadze units in Ghana, were effectively damped within 7sec with PSS at Akosombo GS. It is highly recommended that PSS at Akosombo generation station be activated since their application has a positive impact on the dynamic performance of Ghanas system. Steady state stability be improved by correcting the power factor at the local stations and line relay settings reviewed to accommodate the present operating condition. It is also recommended that the PSS be coordinated effectively with the protection and control devices for optimal performanc
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Qi, Li. "AC system stability analysis and assessment for Shipboard Power Systems". Texas A&M University, 2004. http://hdl.handle.net/1969.1/3128.
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The electric power systems in U.S. Navy ships supply energy to sophisticated systems for weapons, communications, navigation and operation. The reliability and survivability of a Shipboard Power System (SPS) are critical to the mission of a Navy ship, especially under battle conditions. When a weapon hits the ship in the event of battle, it can cause severe damage to the electrical systems on the ship. Researchers in the Power System Automation Laboratory (PSAL) at Texas A&M University have developed methods for performing reconfiguration of SPS before or after a weapon hit to reduce the damage to SPS. Reconfiguration operations change the topology of an SPS. When a system is stressed, these topology changes and induced dynamics of equipment due to reconfiguration might cause voltage instability, such as progressive voltage decreases or voltage oscillations. SPS stability thus should be assessed to ensure the stable operation of a system during reconfiguration.
In this dissertation, time frames of SPS dynamics are presented. Stability problems during SPS reconfiguration are classified as long-term stability problems. Since angle stability is strongly maintained in SPS, voltage stability is studied in this dissertation for SPS stability during reconfiguration. A test SPS computer model, whose simulation results were used for stability studies, is presented in this dissertation. The model used a new generalized methodology for modeling and simulating ungrounded stiffly grounded power systems.
This dissertation presents two new indices, a static voltage stability index (SVSILji) and a dynamic voltage stability index (DVSI), for assessing the voltage stability in static and dynamic analysis. SVSILji assesses system stability by all lines in SPS. DVSI detects local bifurcations in SPS. SVSILji was found to be a better index in comparison with some indices in the literature for a study on a two-bus power system. Also, results of DVSI were similar to the results of conventional bifurcation analysis software when applied to a small power system. Using SVSILji and DVSI on the test SPS computer model, three of four factors affection voltage stability during SPS reconfiguration were verified. During reconfiguration, SVSILji and DVSI are used together to assess SPS stability.
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Gnanam, Gnanaprabhu. "Optimal power flow including voltage stability". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1996. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/mq25844.pdf.
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Adu, James Amankwah <1990>. "Participation of wind power plants in power system stability". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2022. http://amsdottorato.unibo.it/10109/1/PhD_Thesis_Final.pdf.
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The integration of large amounts of wind power in power systems coupled with the increasing replacement of large conventional synchronous generators by wind power plants (WPPs) presents a considerable impact on power system stability. This is partly because most WPPs, particularly variable speed wind turbine (VSWT) types, are connected to the network via power converters which decouples their output power from the grid frequency, and this results in considerable loss of system inertia. Also, VSWTs are in general operated at the maximum power point tracking, which makes them unable to increase their output power beyond the maximum power level for long-term frequency support. For this reason, it is important to develop control techniques that enable WPPs to participate in power system stability improvement. In literature, several studies have been reported on the frequency control provision of a wind turbines (WT), mainly classified into two categories: inertial response (IR) and primary frequency response (PFR).
This work investigates the IR and PFR capabilities of VSWTs; the control schemes are presented in detail and the required energy buffers also discussed. For the IR, the electrostatic energy stored in the dc-link capacitors and the kinetic energy reserve of the WT rotors are utilised. The PFR service is guaranteed by a deloading scheme that reserves a portion of the maximum available power of the WT. Also, the possibility of providing both IR and PFR using external energy storage systems, in this work supercapacitors and battery energy storage system, has been considered. For each support scheme analysed, this work provides a comprehensive survey.
This dissertation further proposes two coordinated control strategies that exploits the full potential of VSWTs to participate in power system frequency response enhancement and small-signal stability support.
All the control schemes are developed and simulation studies performed on DIgSILENT PowerFactory simulation environment.
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Matos, Bruna Krasota. "Finite-time stability of switched systems with application to power system stability problems". reponame:Repositório Institucional da UFPR, 2015. http://hdl.handle.net/1884/45688.
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Supervisor : Prof. Dr. Roman KuiavaDissertação (mestrado) - Universidade Federal do Paraná, Setor de Tecnologia, Programa de Pós-Graduação em Engenharia Elétrica. Defesa: Curitiba, 30/08/2016
Inclui referências : f. 79-82
Área de concentração
Resumo: O conceito de estabilidade a tempo finito (ETF) foi criado em 1950. Sistemas dinâmicos cujas trajetórias convergem para o estado de equilíbrio em um tempo finito fazem parte desse conceito. Sistemas chaveados lineares não homogêneos também estõ sendo considerados. Esses sistemas são oriundos de muitas aplicações de controle e para casos aonde sistemas físicos não são descritos por processos unicamente contínuos ou unicamente discretos. Essa dissertação esta concentrada no problema de estabilidade a tempo finito de uma classe de sistemas chaveados lineares não homogêneos contínuos no tempo sob um sinal de chaveamento dependente do tempo seguindo um tempo de permanência T. Uma vez que a estabilidade a tempo finito é garantida, um dos principais resultados dessa dissertação garante que qualquer trajetória do sistema que comece em uma região 1 do espaço de estados, permanecera dentro de 2 _ 1 ao longo de um intervalo de tempo finito, e para qualquer sequencia de chaveamento com tempo de estabelecimento ¯ T _ T. As condições de estabilidade a tempo finito obtidas na forma de inequações matriciais bilineares (BMIs), podem ser transformadas em inequações matriciais lineares (LMIs) por uma sequência de passos que incluem o cálculo dos conjuntos 1 e 2 por meio de um conhecimento prévio dos limites de operação do sistema. Dois exemplos ilustrativos do estudo de estabilidade em sistemas de potência são utilizados para apresentar a validade dos resultados. Palavras-chave: estabilidade a tempo finito, sistemas chaveados não autônomos, inequações matriciais lineares
Abstract: The finite-time stability (FTS) concept was created in the 1950. Dynamical systems whose trajectories converge to an equilibrium state in finite time are involved in this concept. Switched non-homogeneous linear systems are being considered. These systems can result from many control applications and for cases where physical systems are not described by simply continuous or simply discrete processes. This dissertation is concerned with the finite-time stability problem of a class of linear continuous-time non-homogeneous switched systems under a time-dependent switching signal constrained by a dwell-time T. Once the finite-time stability is guaranteed, one of the main results of the dissertation guarantees that any system trajectory starting in a subset 1 of the state-space will remain in 2 _ 1 over a finite time interval, and, for any switching sequence with a dwell-time ¯ T _ T. The finite-time stability conditions which provided in the form of bilinear matrix inequalities (BMIs), can be transformed to linear matrix inequalities (LMIs) by means of a step-by-step procedure that includes the computation of the sets 1 and 2 by the knowledge of the system's operating range. Two illustrative examples in power system stability study are used to show the validity of the results. Keywords: finite-time stability, Non-autonomous switched systems, Linear matrix inequalities
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Anderson, Sharon Lee. "Reduced order power system models for transient stability studies". Thesis, This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-09052009-040743/.
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Dai, F. "Load modelling for power system stability studies". Thesis, University of Manchester, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.578290.
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Brook, D. P. "Power system stability using coordinated controller settings". Thesis, University of Bath, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419343.
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Hiskens, Ian A. "Energy functions, transient stability and voltage behaviour /". Online version, 1990. http://bibpurl.oclc.org/web/30417.
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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 modes. Therefore, it is necessary to implement a new control strategy to enhance damping of inter-area oscillation modes. With today’s advancement of phasor measurement units (PMUs), global information, which contains valuable information about the existence of inter-area oscillation modes, could be possibly used as inputs to mitigate inter-area oscillations as the literature suggests. The aim of this thesis is to propose supervisory power system stabilisers (SPSS) which are based on Fuzzy Logic to improve damping of such electro-mechanical oscillations in particular inter-area oscillation modes. Three different structures of supervisory power system stabilisers are presented in this thesis. The inputs to the proposed supervisory damping controllers will use global signals, speeds and their derivatives; however, the structure of the inputs to the supervisory power system stabilisers is different depending on the structural design of SPSS. The uniqueness of each SPSS type proposed is that they all make use of the same control rules regardless to which power system is applied. The robustness of such control rules and proposed SPSS are verified on three different test systems as the results of the case studies demonstrate. The time domain simulations will highlight the impact of each SPSS type on the system response.
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Oukati, Sadegh Mahmoud. "Control of power electronic devices (FACTS) to enhance power system stability". Thesis, University of Strathclyde, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275177.
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McIlhagger, David. "Acceleration of power system small signal stability analysis". Thesis, Queen's University Belfast, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.486529.
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Electric power networks comprise large complex interconnections of generation and loads. The generators, and their controllers, are non-linear dynamic systems which on interconnection form a very complex control problem. Traditionally the models used to capture the small signal Rtability of these systems were not highly detailed. This waR jURtified Rince the generation was provided by large centralized power Rtations, however with the current trend towards small scale and diRtributed generation, as provided by.wind farmR and diesel genRetR, the power system modelR require a greater level of detail. This means that the stability assessment of theRe models involves greater detail and requires greater computation time, thus rendering near future predictions obsolete. ThiR thesis studies the methods that are Ilsed to determine • power system small signal stability, in order to provide acceleration to this analysis. A method based on wavelet approximations to provide an approximate solution was developed and its effectiveneRs against the traditional QR algorithm waR investigated. The method was applied to a four generator RyRtem and the IEEE New England 39 bus Rystem. Alternative methods to form accelerating polynomials for eigenvalue methodR were developed and evaluated against the IEEE New England 39 bus system. A new algorithm, called the polygon polynomial Arnoldi method (PPAM) was developed and tested against the implicitly restarted Arnoldi method (IRAM), from the linear algebra literature. The effectiveness of both theRe methods was tested against the IEEE New England 39 bus system and the one area IEEE reliability test system along with that for the QR algorithm.
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singhvi, vikas. "Small Signal Stability of an Unregulated Power System". MSSTATE, 2002. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11062002-140310/.
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Rotor angle stability is the ability of the interconnected synchronous machines of a power system to remain in synchronism. This stability problem is concerned with the behavior of one or more synchronous machine after they have been perturbed. These perturbations can be small or large depending upon the type of disturbances considered. The work presented in this thesis is focused on the power system behavior when subjected to small disturbances. The ?small signal? disturbances are considered sufficiently small for the linearization of system equations to be permissible for the purpose of the analysis. The first step in the small signal stability studies is to obtain initial steady state conditions using load flow solutions. After establishing initial conditions, an unregulated mathematical model of the power system is formed. The mathematical model obtained is a set of nonlinear coupled first order differential equations. The method of small changes, called the perturbation method, is used to linearize these nonlinear differential equations. The equations are then written in a linear state space model form. The eigenvalues and the participation factors are obtained from the state matrix and the contribution of a particular machine in a particular mode or oscillations (or eigenvalue) can be examined for the small signal stability studies.
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Mahmoud, G. A. "A new method of assessing power system stability". Thesis, University of Newcastle Upon Tyne, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372306.
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Whitlock, Rogers Jr. "Identification of Power System Stability Using Relevant Modes". ScholarWorks@UNO, 2011. http://scholarworks.uno.edu/td/1384.
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The purpose of this investigation is to identify appropriate location of capacitor banks and sources of reactive power by studying power system stability in the vicinity of system equilibrium states. The locations for reactive power sources are determined by identifying those modes of the system that participate most in the system behavior in general and in dictating the final state of the system after experiencing faults or disturbances. To identify the relevant modes of the system that participate most in the system dynamic, we shall make use of modal and participation analysis for different system conditions. We also apply modal and participation analysis to a system in order to identify the components of greatest impact that result in the most efficient system control. The ideas developed in this study are used to analyze and identify weak boundaries of the IEEE 39- Bus system that contribute to the system’s instability.
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Cheung, Siu-pan. "Direct transient stability margin assessment of power system with excitation control and SVC control /". Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1753706X.
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Manansala, Edgardo Celestino. "Adaptive power system control". Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54391.
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This work presents a centralized control scheme applied to a power system. The scheme has adaptive characteristics which allow the controller to keep track of the changing power system operating point and to control nonlinear functions of state variables. Feedback to the controller is obtained from phasor measurements at chosen power system buses, generator field voltage measurements, and state estimators. Control effort is aimed at minimizing the oscillations and influencing the power system state trajectory through the control of linear and nonlinear functions of state variables during a power system disturbance.
The main contributions of this dissertation are the simultaneous introduction and utilization of measurement based terms in the state and output equations in the derivation and implementation of the control law, the study of limits on controller performance as the state residual vector becomes very large, and the simulation of the performance of local state estimators to prove the need for faster phasor measurement systems.
The test system is a hypothetical 39-Bus AC power system consisting of typical components which have been sufficiently modelled for the simulation of power system performance in a dynamic stability study.Ph. D.
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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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CIVINSLarge 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 power systems. The tightly coupled and compact nature of shipboard systems are best accommodated by composite system stability analyses. Composite system methods, based upon Lyapunov's direct method, require that each component's stability be represented by a Lyapunov function. A new Lyapunov function which is based upon coenergy is developed for 3-phase synchronous machines. This use of coenergy is generalizable to all electromechanical energy conversion devices. The coenergy-based Lyapunov function is implemented as a "stability organ" which generates waveforms at information teirninals of a "device object" in the object oriented simulation environment of WAVESIM. Single generator simulation results are used to acquire a measure of the "over sufficiency" of the coenergy-based Lyapunov function. Some means of combining the components' Lyapunov functions is necessary with composite system stability criterions. To provide the largest stability region in a Lyapunov function convective derivative space, thereby reducing "over sufficiency", a "timevariant weighted-sum" composite system criterion is developed. This criterion is implemented as a "stability demon" "device object" within the WAVESIM environment. The "stability demon" is tested through RLC circuit simulations and a two-generator simulation. The output of the "stability demon" is suitable for use within an overall system stabilising controller.
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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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Farsangi, Malihe Maghfouri. "Robust control of flexible AC transmission systems for damping power system oscillations". Thesis, Brunel University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269400.
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Hua, Ke Qian. "Probabilistic power system contingency analysis considering wind". Thesis, Queensland University of Technology, 2015. https://eprints.qut.edu.au/79903/1/Ke%20Qian_Hua_Thesis.pdf.
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This thesis was a step forward in developing probabilistic assessment of power system response to faults subject to intermittent generation by renewable energy. It has investigated the wind power fluctuation effect on power system stability, and the developed fast estimation process has demonstrated the feasibility for real-time implementation. A better balance between power network security and efficiency can be achieved based on this research outcome.
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Zhang, Yi. "Adaptive remedial action schemes for transient instability". Online access for everyone, 2007. http://www.dissertations.wsu.edu/Dissertations/Fall2007/y_zhang_112707.pdf.
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Wang, Min. "Pattern recognition methodology for network-based diagnostics of power quality problems /". Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/6099.
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張小彬 i Siu-pan Cheung. "Direct transient stability margin assessment of power system with excitation control and SVC control". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1996. http://hub.hku.hk/bib/B31212979.
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Al-Dulaimi, J. J. M. "A study of power system network equivalence". Thesis, University of Glasgow, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381329.
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Sayler, Kent Alexander Halpin S. Mark. "Predicting generator coupling using power system impedance matrices". Auburn, Ala., 2006. http://repo.lib.auburn.edu/2006%20Spring/master's/SAYLER_KENT_33.pdf.
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Tang, Yousin. "Power system stability in the presence of FACTS elements". Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/13432.
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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 PMSG grid-interfaced models, named PMSG Boost and PMSG Rectifier-Inverter. We analyze the aforesaid system using symmetrical and asymmetrical grid faults and observe the following parameters: (a) voltage support, (b) active and reactive power support, (c) stringent grid-code conduct, (d) overvoltage and overcurrent protection of rotor and stator, and (e) damped rotor oscillations in current and voltage. On the other side, we also propose a bi-directional model for power system and data centers. The goal of this research work is to increase the steady-state performance of the power system through computational capabilities of the data centers. Enormous energy consumption of data centers has a major impact on power systems by significantly increasing the electrical load. Due to the increase in electrical load, power systems are facing demand and supply miss-management problems. Therefore, power systems require fast and intelligent ancillary services to maintain robustness, reliability, and stability. Power system jobs will make this situation even more critical for data centers. In our work, we seek an Ancillary Services Model (ASM) to service data centers and power systems. In ASM, we find an optimal job scheduling technique for executing power systems? jobs on data centers in terms of low power consumption, reduced makespan, and fewer preempted jobs. The power systems? jobs include Optimal Power Flow (OPF) calculation, transmission line importance index, and bus importance index. Furthermore, a Service Level Agreement (SLA) between data centers and power systems is shown to provide mutual benefits.
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Wu, Yifan. "Grid-forming Inverter Control for Improving Power System Stability". Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/27492.
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Renewable energy sources are being widely adopted by more and more countries due to their comparatively low cost, flexibility, and environmental benefits. Grid-forming control is becoming an important technology to address the stability issues resulting from the retirement of conventional synchronous generation. Unlike conventional grid-following inverters, predominantly used today for the connection of wind and solar farms, grid-forming inverters behave much like synchronous machines by providing both inertia and system strength. Against this backdrop, this thesis investigates the problem of designing grid-forming inverter control algorithms for the utility-scale battery storage system, focusing on power system applications specifically. Firstly, we investigated the theory of grid-tied inverter control strategies. Then we mathematically modelled the voltage source converter (VSC) system and used DIgSILENT PowerFactory to conduct several case studies. For the first case study, a four-bus test system was modelled, which then served as a benchmark system to test the system-level control strategies for the grid-tied inverter. The crucial role of the grid-forming control in supporting system inertia and system strength was revealed. Furthermore, we proposed a stability scanning framework to help system planners determine the amount and location of utility-scale battery storage equipped with grid-forming inverters. Afterwards, we used a simplified model of the Australian NEM as another case study. We performed time-series scanning with an hourly resolution to capture the intraday and interseasonal variation in the output of variable renewable generation. The results demonstrated that grid-forming control could markedly improve the frequency performance of power systems dominated by converter-interfaced renewable generation.
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Kharrazi, Ali. "The use of artificial intelligent in power system stability". Thesis, Kharrazi, Ali (2015) The use of artificial intelligent in power system stability. Other thesis, Murdoch University, 2015. https://researchrepository.murdoch.edu.au/id/eprint/28262/.
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In this project the use of Artificial Intelligence in Power System Stability Enhancement is studied. The focus of the project is on low frequency oscillation in power systems. These oscillations known as electromechanical modes of oscillation were observed in power systems in the early 1960’s. They are the result of kinetic energy exchange between synchronous generators in a power system. Power System Stabilizers has been used to dampen these oscillations. Conventional Power System Stabilizers (CPSS) have been used for decades in power systems. They consist of a washout filter and two lead lag blocks to compensate the phase lag of the system.
Tuning of CPSS is of paramount importance for proper response and function. In this project, a Genetic Algorithm (GA) optimization process is introduced in order to tune the parameters of a CPSS in a Single Machine Infinite Bus system. The power system is modelled in PowerFactory and GA optimization uses the MATLAB Optimization Toolbox. An effective data exchange is engineered between PowerFactory and MATLAB to facilitate the tuning process. The optimization is performed using the position of the eigenvalues of the power system which are found by running Modal Analysis in PowerFactory. The main goal of optimization is to tune the parameters of CPSS to maximize the dampening ratio of all oscillatory modes.
In the next section of the project an Artificial Neural Network (ANN) based power stabilizer is introduced. Two neural networks are designed. First is a Neural Identifier to model the dynamics of the system and to predict the future output of the system. Second is a Neural Controller to provide proper stabilizing signals to dampen the oscillation by comparing the output of Neural Identifier with the desired value. A data interface between PowerFactory and MATLAB is established in order to enable the training and simulation of the proposed control structure.
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Elhaji, Emad Mohamed. "IMPACT OF WIND TURBINE ON POWER SYSTEM VOLTAGE STABILITY". OpenSIUC, 2011. https://opensiuc.lib.siu.edu/theses/571.
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This thesis discusses the impact of WTGUs on the IEEE 26-bus power system voltage stability. The effect of WTGUs is studied by increasing the real generated power and real and reactive load power by factor (1+∆λ) where ∆λ is incremental in the loading factor until reaching the voltages on the buses to the point of collapse. The lowest voltage bus in the system is a critical bus that WTGUs will be connected on it. The WTGUs are Farm of wind turbines that are connected to the system. Two types of WTGUs are discussed in this thesis. The first type of WTGU that discus is the fixed speed wind turbine. There are two types of fixed speed wind turbines: pitch angle regulated, and stall regulated. The pitch angle regulated fixed speed wind turbine is focused in this study. The second type of WTGU is the semi-variable speed wind turbine. The models of WTGUs for both types, pitch angle regulated, and semi-variable speed, are used to calculate the reactive power that will be added to the system, but real power is known from manufacture. The real and reactive powers for both WTGUs are dependent on the wind speed, wind turbine characteristic, parameters for induction generator and terminal voltage. One of the most important parts in this thesis is the sensitivity analysis. The main concept of the sensitivity is the slope of the voltage profile at specific loading factor λ. In this part, the study is focused on the affect of increasing the real generated power and real and reactive loaded power on the critical bus.
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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 comprising a Supplementary Wide-Area Controller (SWAC) built on top of existing Power System Stabilisers (PSSs). The SWAC's focus is on stabilising the critical interarea oscillations in the system while leaving local modes to be controlled entirely by local PSSs. Both control systems in the two levels work together to maintain system stability. The scheme relies on synchronised measurements supplied by Phasor Measurement Units (PMUs) through the WAMS and the only cost requirement is for the communication infrastructure which is already available, or it will be in the near future. A novel linear quadratic Gaussian (LQG) control design approach which targets the interarea modes directly is introduced in this thesis. Its features are demonstrated through a comparison with the conventional method commonly used in power system damping applications. The modal LQG approach offers simplicity and flexibility when targeting multiple interarea modes without affecting local modes and local controllers, thus making it highly suitable to hierarchical WAMS based control schemes. Applicability of the approach to large power systems is demonstrated using different scenarios of model order reduction. The design approach incorporates time delays experienced in the transmission of the SWAC's input/output signals. Issues regarding values of time delays and required level of detail in modelling time delays are thoroughly discussed. Three methods for selection of input/output signals for WAMS based damping controllers are presented and reviewed. The first method uses modal observability/controllability factors. The second method is based on the Sequential Orthogonalisation (SO) algorithm, a tool for the optimal placement of measurement devices. Its application is extended and generalised in this thesis to handle the problem of input/output signal selection. The third method combines clustering techniques and modal factor analysis. The clustering method uses advanced Principal Component Analysis (PCA) where its draw backs and limitations, in the context of power system dynamics' applications, are overcome. The methods for signal selection are compared using both small signal and transient stability analysis to determine the best optimal set of signals. Enhancement of power system stability is demonstrated by applying the proposed WAMS based control scheme on the New England test system. The multi-input multi-output (MIMO) WAMS based damping controller uses a reduced set of input/output signals and is designed using the modal LQG approach. Effectiveness of the control scheme is comprehensively assessed using both small signal and transient stability analysis for different case studies including small and large disturbances, changes in network topology and operating condition, variations in time delays, and failure of communication links.
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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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Zhang, Yang. "Design of wide-area damping control systems for power system low-frequency inter-area oscillations". Online access for everyone, 2007. http://www.dissertations.wsu.edu/Dissertations/Fall2007/y_zhang_112007.pdf.
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Ebrahimpour, Mohammad Reza. "An analytical study of the power flow equations with applications to systems with multiple close solutions". Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/15746.
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Remón, Rodríguez Daniel. "Impact of solar PV plants with synchronous power controllers on power system stability". Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/461837.
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The irruption of renewable energy sources with power electronics interfaces is transforming power systems. To minimize the possible adverse effects that these generating systems may have on the power grid, transmission system operators define different strategies, such as increasing the active power reserves for frequency control and power balancing purposes, and require all connected systems to comply with various rules and regulations. In an effort to better integrate these renewable sources in power systems, some power converter controllers have been proposed that aim at reproducing certain features of conventional synchronous machines. This work deals with the analysis of the impact that large power-electronics-based power plants, in the range of hundreds of megawatts, have on the stability of power systems. First, the main characteristics of these advanced controllers, sometimes referred to as virtual synchronous machines, are reviewed, and their constituting blocks are systematically classified. This classification allows performing a detailed comparison of different aspects regarding their implementation and dynamics. The proposals usually found in the literature are compared in terms of their need for ancillary synchronization systems, their ability to energize a grid, or their effectiveness to limit the current injected during a fault and keep the converters connected to the grid. Additionally, time-domain simulations comparing the response of power converters employing these controllers are carried out and analyzed. Afterwards, since the study of power system stability requires adequate models of the elements interacting with the system, the modeling of an actual 100 MW photovoltaic power plant, consisting of 100 power converters, is addressed. Thus, a detailed model of the power plant is developed, considering a single-phase equivalent for transient stability studies in balanced systems. This model includes the internal network buses, cables, and transformers, and the power converters with their control systems and primary resources. Moreover, the model is implemented in a flexible way that allows considering power converters employing conventional controllers or synchronous power controllers, and the photovoltaic resource can be replaced by a storage system. Furthermore, a method to derive an equivalent model of power plants employing these advanced controllers is developed, and three equivalent models of the power plant, with different degrees of detail, are implemented employing this method. These models allow reducing the complexity of the original model and its associated computational burden, while reproducing its dynamics with accuracy, making them more suitable for the analysis of power systems with a large number of generating units, loads, passive elements, and controllers. Finally, the stability of power systems integrating this type of generating stations is analyzed. A first analysis is carried out in a 12-bus test system, considering a simpler model of the plant where the photovoltaic characteristics are modeled only through an active power limitation, and comparing the impact of these plants as the solar penetration grows, up to a 50% level. This is followed by the analysis of the power system of northern Chile, considering the actual location of the power plant previously modeled, and including the full detail of the photovoltaic resource. Lastly, the impact of hybrid power plants consisting of a synchronous generator and a photovoltaic system, with different configurations with the possibility of curtailing the solar production or employing a storage system, is assessed. These analyses comprise the study of the eigenvalues of the system and its response to different types of events through time-domain simulation, and prove the ability of the studied controllers to increase the damping of the system , to reduce the oscillations suffered by other generators, and to limit maximum frequency deviations.La irrupción de fuentes de energía renovables como la energía solar fotovoltaica está transformando los sistemas eléctricos. Para minimizar los posibles efectos adversos sobre la red eléctrica de los sistemas de generación conectados mediante convertidores de electrónica de potencia, los operadores de los sistemas eléctricos definen diferentes estrategias y exigen que todos los sistemas conectados a la red cumplan diferentes normas. Con el objetivo de permitir una mejor integración de estas fuentes renovables, se han propuesto varios controladores de convertidores de potencia que intentan reproducir algunas características de las máquinas síncronas convencionales. Esta tesis trata sobre el análisis del impacto que las centrales eléctricas de grandes dimensiones basadas en electrónica de potencia tienen en la estabilidad de los sistemas eléctricos. En primer lugar, se clasifican estos controladores avanzados, lo que permite realizar una comparación detallada de varios aspectos relacionados con su implementación y su dinámica. Las propuestas más comunes se comparan en cuanto a su necesidad de sistemas de sincronización auxiliares, su habilidad para energizar una red, o su efectividad a la hora de limitar la corriente inyectada durante una falta y mantener los convertidores conectados a la red. Además, se realizan y analizan simulaciones de la respuesta de convertidores de potencia que utilizan estos controladores. A continuación, se presenta el modelado de una planta fotovoltaica real de 100 MW formada por 100 convertidores de potencia, considerando su equivalente monofásico para estudios de estabilidad transitoria en sistemas equilibrados. Este modelo incluye los terminales, cables y transformadores de la red interna, así como los convertidores de potencia con sus sistemas de control y recursos primarios. Además, el modelo está diseñado de manera flexible, permitiendo considerar controladores convencionales o controladores de potencia síncronos, y el recurso fotovoltaico se puede sustituir por un sistema de almacenamiento. Adicionalmente, se desarrolla un método para calcular un modelo equivalente de las centrales eléctricas que utilizan esta clase de controladores avanzados y se obtienen tres modelos equivalentes de la planta, con distintos niveles de detalle. Estos modelos permiten reducir la complejidad del modelo original y su carga computacional asociada, al mismo tiempo que reproducen su dinámica con precisión, haciéndolos más adecuados para el análisis de sistemas eléctricos con un gran número de unidades de generación, cargas, elementos pasivos y controladores. Finalmente, se analiza la estabilidad de sistemas eléctricos que integran este tipo de plantas generadoras. Se lleva a cabo un primer análisis en un sistema de pruebas de doce barras, considerando un modelo más sencillo de la planta donde las características fotovoltaicas se modelan únicamente mediante una limitación de la potencia activa, y se compara el impacto de estas plantas en distintos escenarios con una penetración solar creciente, llegando a un nivel del 50% de la generación total. Después, se analiza el Sistema Interconectado del Norte Grande de Chile, teniendo en cuenta la situación real de la planta modelada previamente e incluyendo el recurso fotovoltaico en detalle. Por último, se evalúa el impacto que pueden tener las plantas híbridas formadas por un generador síncrono y un sistema fotovoltaico, con diferentes configuraciones con la posibilidad de reservar parte de la producción solar o utilizar un sistema de almacenamiento. Estos análisis comprenden el estudio tanto de los valores propios del sistema como de su respuesta a diferentes tipos de eventos mediante simulaciones en el dominio del tiempo, y demuestran la capacidad de los controladores estudiados para incrementar el amortiguamiento del sistema, reducir las oscilaciones a las que se ven sometidos otros generadores y limitar las máximas desviaciones de frecuencia.
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Boesak, Dawid John Johannes. "Voltage stability analysis of a power system network comprising a nuclear power plant". Master's thesis, Faculty of Engineering and the Built Environment, 2018. http://hdl.handle.net/11427/30056.
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As recently as 2016, the performance of South Africa’s power utility has shown that it is not resilient enough to withstand the consequences of a power system blackout. Blackouts are defined as being a form of power system instability that can be brought about by a variety of abnormal network scenarios. The most common modes of failure are grouped under the term power system stability. In this dissertation, the different modes of power stability that can affect a nuclear power station will be investigated and discussed. The particular phenomenon that will be focused on, however, is the effect that voltage instability has on the ability of generators and loads to perform their standard functions, thus ensuring a secure power system. To investigate the effect that voltage instability has on a nuclear power station, this dissertation will look at relevant literature on the topic. In addition, by extracting from common examples of national and international occurrences of voltage stability, this dissertation will record the effects that this phenomenon has on the security of a power system, in particular on nuclear power plants. To model the network containing a nuclear power plant for the evaluation of voltage stability, the different mathematical models of the generation plant are presented, which include: the automatic voltage regulator, power system stabilizer, governor, nuclear reactor, and excitation system. Also presented are mathematical models of network equipment such as under voltage tap changers and the dynamic loads that are of interest when evaluating voltage stability. The models used for evaluation of the voltage stability phenomenon affecting a nuclear power plant and the surrounding integrated power system are built in the Digsilent PowerFactory® software. The scenario for evaluation is based on a voltage stability event that occurred around at the Koeberg nuclear power system situated in the Western Cape province on South Africa on 15 October 2003. It is commonly accepted that voltage stability can be evaluated at a steady state level by performing power versus voltage (PV) analysis to determine the voltage buses vulnerable to voltage collapse, and reactive power versus voltage (QV) analysis to determine the critical reactive devices required to avert a voltage instability event. The scenarios that are evaluated for voltage stability are divided into two sections: i) a PV and QV analysis as per the event that occurred on 15 October 2003 and ii) present-day voltage stability indices for PV and QV if mixed with a generation such as renewable energy sources that include wind, solar, biomass and concentrated solar power (CSPs). The result reveals the vulnerabilities of the nuclear power plant and the surrounding integrated power system due to a voltage instability event. Some of the solutions proposed include a review of the typical power system protection schemes — such as under and overvoltage detection scheme — that are used. In the study, PV and QV curves provide v good indications of the state of critical busbars and the reactive power reserve margins available before instability can potentially settle in. Simulations confirmed the effectiveness of critical equipment installed in the Western Grid and the effect on their electrical parameters such as torque and the slip on motors.
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Falkner, Catherine M. "Robust output feedback controllers for power system stabilization". Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/14802.
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朱太秀 i 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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Parsi-Feraidoonian, Raiomand. "Application of catastrophe theory to transient stability analysis of multimachine power systems". Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/29723.
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Transient stability analysis is an important part of power planning and operation. For large power systems, such analysis is very time consuming and expensive. Therefore, an online
transient stability assessment will be required as these large power systems are operated close to their maximum limits. In this thesis swallowtail catastrophe is used to determine the transient stability regions. The bifurcation set represents the transient stability region in terms of power system transient parameters bounded by the transient stability limits. The system modelling is generalized in such, that the analysis could handle either one or any number of critical machines. This generalized model is then tested on a three-machine as well as a seven-machine system. The results of the stability analysis done with the generalized method is compared with the time solution and the results were satisfactory. The transient stability regions determined are valid for any changes in loading conditions and fault location. This method is a good candidate for on-line assessment of transient stability of power systems.Applied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate
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曾坤明 i Kwan-ming Tsang. "Decoupling and stabilizing control of multi-machine power systems withstatic VAr compensators". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1993. http://hub.hku.hk/bib/B31211008.
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Garmroodi, Doiran Mehdi. "Sensitivity Analysis for Future Grid Stability Studies". Thesis, The University of Sydney, 2016. http://hdl.handle.net/2123/15978.
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The increasing penetration of converter-interfaced generators (CIGs) has raised concerns about the stability and security of future grids (FGs). These resources affect power systems dynamics in many ways including reducing system inertia, interacting with existing generators, changing power flow paths, etc. In this thesis, we carry out a sensitivity study to explore the structural impacts from CIGs on the damping and frequency stability of power systems. Initially, we study the impact of the intermittent power from wind turbine generators (WTGs) on the damping of the electromechanical oscillations in power systems. It will be shown that the inability of WTGs to provide synchronizing and damping torque to the system jeopardize the small signal stability of power systems. Stable operation regions, in terms of wind penetration and tie-line power, are derived and the impact of load flexibility on these regions are discussed. Next, we have studied the impact of the inertia distribution on the damping of the inter-area modes in power systems. It is shown that tie-line power has a significant role on the damping of the inter-area modes. Moreover, we show that dynamic voltage control and inertia emulation can be utilized to improve the damping of the system. By developing an oscillatory recovery model for power system loads, we have also studied the impact of load oscillations on the damping of the inter-area modes. It is shown that the load dynamics can have a significant influence on the electromechanical oscillations of power systems. Finally, the frequency support capability of WTGs is investigated and the performance of different techniques in utilizing the kinetic energy of the WTGs to assist the frequency stability of power systems is evaluated. A novel time-variable droop characteristic is proposed to enhance the contribution of WTGs in supporting system frequency.
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Ferdoush, Md Asif. "System Stability of the Overhead Power Supply System used in the Electric Road System". Thesis, Scania CV AB, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-399815.
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This thesis presents the stability analysis of an Electric Road System (ERS), which is often abbreviated as eHighway, used for the electrification of the hybrid vehicle. The overall system modelling of the ERS, starting from the sub-station to the critical part of the Scania hybrid truck is performed in the MATLAB Simulink environment. The ERS consists of an overhead catenary line (OCL), where vehicles are electrified by using a pantograph mounted over the vehicle. The stability analysis of the power supply of the overhead line is done by taking into account several aspects of the system. The simulation results are validated with the real test track measurements and the deviations are shown. The frequency response of the system is considered to measure the stability margin. The resonance conditions are clarified and essential variable choke is proposed to damp them out. Also the harmonic components injected from the vehicle side, that are in the closer range of the resonance, are figured out and filtered. When multiple vehicles are electrified from the same catenary line, then there are interferences in between the vehicles. These disturbances both to the vehicles and the overhead power supply system are presented in the time domain. Finally, the results are shown to demonstrate the effectiveness of the variable choke to increase the stability margin in the overhead supply system. In the frequency domain results, it has shown that the resonance is shifted out of the system operating frequency. In the time domain results, it has shown that the high amplitude of the current and voltage signals are sufficiently damped out by variable choke implementation.
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Khan, Atif Zaman. "Eigenvalue sensitivites and their applications to power system voltage stability". Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/13911.
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Thandi, Gurjit Singh. "Modeling, Control and Stability Analysis of a PEBB Based DC Distribution Power System". Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/36788.
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Power Electronic Building Block (PEBB) concept is to provide generic building blocks for power conversion, regulation and distribution with control intelligence and autonomy. A comprehensive modeling and analysis of a PEBB based DC distributed power system (DPS), comprising of a front end power factor correction (PFC) boost rectifier, a DC-DC converter and a three phase four leg inverter is performed. All the sub-systems of the DC DPS are modeled and analyzed for stability and good transient performance.
A comprehensive stability analysis of a PEBB based DC DPS is performed. The effect of impedance overlap on the system and individual sub-systems is examined. Ability of a PEBB based converter to stabilize the integrated system by actively changing the system bandwidth is presented. The fault tolerance capability in a PEBB based rectifier is established by ensuring stable system operation, with one leg of the rectifier failed open-circuited.
Master of Science
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Parsons, Antony Cozart. "Automatic location of transient power quality disturbances /". Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.
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張旭健 i Yuk-kin Cheung. "Auto-retuning of power system stabilizers for dynamic stability improvement". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1995. http://hub.hku.hk/bib/B31212207.
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Cheung, Yuk-kin. "Auto-retuning of power system stabilizers for dynamic stability improvement /". Hong Kong : University of Hong Kong, 1995. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19669136.
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