Thèses sur le sujet « VOLTAGE LIMIT »
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Zhu, Pengcheng. « A novel Q-limit guided continuation power flow method for voltage stability analysis ». Thesis, Brunel University, 2008. http://bura.brunel.ac.uk/handle/2438/5360.
Texte intégralSmith, Nathaniel R. « Characterization and Design of Voltage-Mode Controlled Full-Bridge DC/DC Converter with Current Limit ». Wright State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=wright152721348332911.
Texte intégralAbrantes, Adriano Lima. « Bifurcações induzidas por limites no contexto de estabilidade de tensão ». Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-31082016-113911/.
Texte intégralThe interconnection of electric power systems (EPSs) led to an increase in security assessment complexity. Besides, due to economical and environmental inuences, EPSs have been operating closer to their transmission limits, which raises the relevance of security assessment in the context of voltage stability. In this scenario, problems related to EPS power transmission capacity, such as the limit induced bifurcation (LIB), become more important and bring the need of appropriate analysis tools. One of the goals of this project is to study the LIB problem more deeply, so it can be better understood in the context of voltage stability. Another objective is the development of methods for evaluating the load margin (LM) considering the possible occurrence of LIBs. Finally, since the LM sensitivity analysis due to saddle-node bifurcation (SNB) plays a highly important role in voltage stability studies, developing a method for LM sensitivity analysis due to LIB is our third objective. The sensitivity analysis is important not only because it provides information on the instability phenomenon and its mechanisms, but it is also useful for EPS security assessment, since it may provide knowledge on which control actions will be more eective in increasing the LM and which contingencies may be more severe. However, this analysis has been performed only for the case in which the LM is determined by a SNB point, not for the LIB case. With the intention of enabling pre-existing preventive control selection tools to treat the LIB phenomenon, a sensitivity analysis was performed at the LIB point similarly to what was developed for the SNB. Another contribution of this work is a smoothing formulation for complementary limits that was applied to the problem of limited reactive power injection of generating units. The proposed formulation transforms, at least numerically, the LIB in a SNB, which may be detected through methods already established in literature.
Souček, Jan. « Dimenzování přístrojových transformátorů pro digitální ochrany ». Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-218011.
Texte intégralZerweck-Trogisch, Ulrich. « Auflösungsvermögen und Genauigkeit der Kelvinsonden-Rasterkraftmikroskopie und deren Anwendung an molekularen Systemen ». Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2007. http://nbn-resolving.de/urn:nbn:de:swb:14-1196782873906-79057.
Texte intégralTamimi, Ala. « Voltage stability limits for weak power systems with high wind penetration ». Diss., Kansas State University, 2011. http://hdl.handle.net/2097/13100.
Texte intégralDepartment of Electrical and Computer Engineering
Anil Pahwa
Shelli K. Starrett
Analysis of power system voltage stability has practical value in increasing wind penetration levels. As wind penetration levels increase in power systems, voltage stability challenges arise due to locating wind resources far away from load centers. This dissertation presents several different voltage stability methods for sizing new wind farms. Power system wind penetration levels depend on the available voltage stability margins (VSMs) of the existing power system and system load characteristics. Three new iterative methods have been developed to maximize wind penetration level in weak power systems based on systems’ VSMs. The first two methods use an iterative approach for increasing the size of each wind farm until reaching the collapse point. Wind farms with less negative impact on system VSMs are sized larger than others. A third wind farm sizing method has been developed using modal analysis in conjunction with the traditional voltage stability method (Q-V method). Wind farms are placed at buses in the power system which have the lowest negative impact on voltage instability modes (strong wind injection buses). By placing the wind farms at the strongest wind injection buses, higher amounts of wind power can be injected into the power system. To further increase wind penetration in weak power systems, two additional techniques are introduced and applied to the western Kansas power system. The first technique uses modes of voltage instability to place voltage support equipment like static var compensators at locations in the power system where they provide the needed reactive power support for increasing levels of wind penetration. The second technique uses the fact that wind patterns at a wind farm site may rarely allow the wind farm to produce its maximum capacity during the peak loading hours. Wind farm maximum sizes can be increased above their maximum voltage stable size limit without driving the power system into becoming voltage unstable. Preventing voltage collapse for the additional increases in wind farm sizes is accomplished by disconnecting some wind turbines inside the wind farm during critical times to reduce its power output to a voltage stable level.
Poyan, Kaveh. « Investigation of Western Power’s low voltage operation limits with the integration of Photovoltaic systems ». Thesis, Poyan, Kaveh (2010) Investigation of Western Power’s low voltage operation limits with the integration of Photovoltaic systems. Other thesis, Murdoch University, 2010. https://researchrepository.murdoch.edu.au/id/eprint/3226/.
Texte intégralPierini, Daniele. « Analisi del comportamento di volte soggette a carichi verticali ed azioni orizzontali : applicazione ad un caso studio ». Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
Trouver le texte intégralWang, Wei-Ming, et 王瑋民. « Analysis of Voltage Stability Limit for Radial Distribution Systems ». Thesis, 1995. http://ndltd.ncl.edu.tw/handle/68754059370236313483.
Texte intégral國立成功大學
電機工程研究所
84
In this dissertation, the steady-state small dis -turbance voltage stability limit for a radial distribution system is thoroughly analyzed. The solutions for radial distribution systems. By this method, an equivalent 2-bus network can be obtained during the solving process. Based on the 2-bus network, the steady-state load limit and voltage stability limit are investigated. The circle diagrams and Jacobian determinant are developed first to derive the load limit and voltage stability limit for radial distribution systems. For the purpose of checking the limits equations derived by the authors, the well-known L stability indicator is adopted for the task of justification. The consistency among these methods is shown. It is shown that the positive Jacobian determinant corresponds to an L indicator less than 1 which meets the voltage stability criterion. To show the effects of load models on the voltage stability limit, a composite load model composed of a part of constant power load, a part of constant impedance load and a part of constant current load is adopted to derive the general equation of voltage stability limit. It is found that the voltage stability problems are mostly caused by the constant power load. In the literature, almost all the tasks of proving the uniqueness of a voltage solution for a radial distribution system are based on a 2-bus system. In this dissertation, the authors derive a general equation of the [dV/dP] of load bus, and by checking the sign of [dV/dP] of each load bus, the uniqueness of a voltage solution can be shown. The method of proof developed is more general than those methods published.
PANDEY, GANESH KUMAR. « LOAD FLOW USING PARTICLE SWARM OPTIMIZATION ». Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14645.
Texte intégralShieh, Jeng-Cheng, et 謝正誠. « The Study and Improvement of Voltage Stability with the Limit of Power Transmission ». Thesis, 1999. http://ndltd.ncl.edu.tw/handle/38340033520241485104.
Texte intégral國立臺北科技大學
機電整合研究所
87
Taiwan power system in the peak-load period has a large amount of power flow through 345kV-transmission lines from the central and southern areas to northern area. In this time, if one of these lines is tripped, the voltage stability of the power system would be affected. Hence, how to prevent voltage collapse and compensate the reactive power of a power system become very important. In the past, most of researches in the field of voltage stability used uniform rate to deal with the system load increase. In this paper, we analyze the power system stability, focusing on the limit of transmission line power flow between two areas. This paper uses PSS/E, IPLAN and OPF analysis package to develop a helpful method to generate P-V curves for Taiwan power system voltage stability analysis. Using these P-V curves, it is easy to identify the saddle-node bifurcation point and to determine the weak bus index and real power transmission limit from the central area to northern area. Besides, in normal operating condition, some line outage cases with 345kV-interface line from central area to northern area and some generator outage cases of the voltage stability of Taiwan power system were studied. Finally, the optimal compensation of the parallel capacitors and series capacitors to improve the voltage stability of the system were proposed in this paper.
Jeng, Jyh-Cheng, et 鄭至成. « Analysis of Steady-State Voltage Stability Limit of Radial Distribution Systems Considering Load Characteristics ». Thesis, 1995. http://ndltd.ncl.edu.tw/handle/92724972776797425270.
Texte intégral國立成功大學
電機工程研究所
83
Analysis of voltage stability limit is an important topic in the study of a distribution system. In this thesis, the effects of different types of static loads is investigated on the steady-state voltage stability limit for a radial distribution system. The loads adopted in the investigation include constant power loads, constant impedance loads and constant current loads. Furthermore, the uniqueness and existence of the voltage solution are discussed. In solving the load flow problems of the radial power network, the DistFlow technique has been proposed as the most suitable method. In this method, an equivalent two-bus network will be obtained simultaneously. Based on that, the analysis in this thesis is mainly concentrated on the two-bus system. The detailed simulated results are presented to justify the opinions proposed.The result reveal that when a larger part of constant current or constant impedance load is added to the total load, the voltage stability limit will move far into the lower branch of the P-V curve and multiple load flow solutions may exist.
Sarnari, Alberto Jose. « Numerically Robust Load Flow Techniques in Power System Planning ». Thesis, 2019. http://hdl.handle.net/2440/119928.
Texte intégralThesis (Ph.D.) -- University of Adelaide, School of Electrical and Electronic Engineering, 2019
Avalos, Munoz Jose Rafael. « Analysis and Application of Optimization Techniques to Power System Security and Electricity Markets ». Thesis, 2008. http://hdl.handle.net/10012/3692.
Texte intégralMaloko, Thabane Silas. « Voltage unbalance emition limits for new connections including single phase MV systems ». Thesis, 2011. http://hdl.handle.net/10413/6882.
Texte intégralThesis (M.Sc.Eng.)-University of KwaZulu-Natal, Durban, 2011.
Le, Ha Thu. « Increasing wind power penetration and voltage stability limits using energy storage systems ». Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-05-864.
Texte intégraltext
Lu, Liming. « Immediate change in stability and voltage collapse when power system limits are encountered ». 1991. http://catalog.hathitrust.org/api/volumes/oclc/24350837.html.
Texte intégralTypescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 34-37).
Masi, Daniele. « Il metodo delle reti di spinta per l'analisi limite di volte e scale in muratura ». Tesi di dottorato, 2018. http://www.fedoa.unina.it/12656/19/Daniele_Masi_Tesi_PhD.pdf.
Texte intégralSBRANA, ALESSANDRO. « Faculty Development Centri di Professionalità Accademica (CPA) ». Doctoral thesis, 2018. http://hdl.handle.net/11393/251175.
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