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Academic literature on the topic 'Transient Stabilitet'

Author: Grafiati

Published: 23 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Transient Stabilitet"

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Calderón-Guizar, Jorge Guillermo. "Estudios de estabilidad transitoria en sistemas eléctricos industriales con generación propia interconectados con el sistema de transmisión." Ingeniería, investigación y tecnología 11, no. 4 (October 1, 2010): 445–51. http://dx.doi.org/10.22201/fi.25940732e.2010.11n4.038.

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Patel, Lalit K., Kaushik M. Sangada, Sunil S. Changlani, and Ankit M. Patel. "Coordination Of Pss And Statcom To Enhance The Power System Transient Stability." Indian Journal of Applied Research 1, no. 9 (October 1, 2011): 62–64. http://dx.doi.org/10.15373/2249555x/jun2012/24.

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Schulz, Axel, and Alexander Villinger. "Stabilized Transient R2PN Species." Angewandte Chemie International Edition 52, no. 11 (February 13, 2013): 3068–70. http://dx.doi.org/10.1002/anie.201208533.

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Suzuki, Kenichi, Fumiyuki Sanematsu, Takahiro Fujiwara, Michael Edidin, and Akihiro Kusumi. "S3B5 Stimulation-induced formation of transient but stabilized rafts.(Single Molecure Dynamics and Reactions)." Seibutsu Butsuri 42, supplement2 (2002): S14. http://dx.doi.org/10.2142/biophys.42.s14_4.

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Rathi, N. V., and H. S. Dalvi. "Design of Fuzzy Controller for Improvement of Transient Stability of Hybrid Energy Generation System." International Journal of Engineering and Technology 4, no. 5 (2012): 626–28. http://dx.doi.org/10.7763/ijet.2012.v4.447.

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Marreddy, Uma Vani, Ramana Rao P.V., and Rao P. V. Kumar S.V. "Fuzzy Logic Controller for Enhancement of Transient Stability in Multi Machine AC-DC Power Systems." International Journal of Engineering and Technology 2, no. 5 (2010): 423–29. http://dx.doi.org/10.7763/ijet.2010.v2.159.

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Piotrowski, Andrew, Ping Luo, and Donald A. Morrison. "Competence for Genetic Transformation in Streptococcus pneumoniae: Termination of Activity of the Alternative Sigma Factor ComX Is Independent of Proteolysis of ComX and ComW." Journal of Bacteriology 191, no. 10 (March 13, 2009): 3359–66. http://dx.doi.org/10.1128/jb.01750-08.

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ABSTRACT Competence for genetic transformation in Streptococcus pneumoniae is a transient physiological state whose development is coordinated by a peptide pheromone (CSP) and its receptor, which activates transcription of two downstream genes, comX and comW, and 15 other “early” genes. ComX, a transient alternative sigma factor, drives transcription of “late” genes, many of which are essential for transformation. In vivo, ComW both stabilizes ComX against proteolysis by the ClpE-ClpP protease and stimulates its activity. Interestingly, stabilization of ComX by deletion of the gene encoding the ClpP protease did not extend the period of competence. We considered the hypothesis that the rapid decay of competence arises from a rapid loss of ComW and thus of its ComX stimulating activity, so that ComX might persist but lose its transcriptional activity. Western analysis revealed that ComW is indeed a transient protein, which is also stabilized by deletion of the gene encoding the ClpP protease. However, stabilizing both ComX and ComW did not prolong either ComX activity or the period of transformation, indicating that termination of the transcriptional activity of ComX is not dependent on proteolysis of ComW.

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Rezazadeh, A., M. Sedighizadeh, and A. Alavian. "Optimal Sizing and Sitting of Distributed Generation for Power System Transient Stability Enhancement Using Genetic Algorithm." International Journal of Engineering and Technology 1, no. 5 (2009): 387–90. http://dx.doi.org/10.7763/ijet.2009.v1.73.

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Pradipta, Adya, Mochammad Facta, and Sudjadi Sudjadi. "PERANCANGAN KONVERTER ARUS SEARAH TIPE BUCK CONVERTER DENGAN UMPAN BALIK (FEEDBACK) MENGGUNAKAN IC TL494 SEBAGAI STABILITAS TEGANGAN PENGISIAN BATERAI." TRANSIENT 7, no. 4 (May 25, 2019): 933. http://dx.doi.org/10.14710/transient.7.4.933-940.

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Sumber listrik DC mulai banyak dikembangkan di berbagai sektor terutama di bidang kelistrikan dan otomotif. Hal ini dampak dari inovasi perkembangan teknologi yang sangat pesat khususnya pada perangkat dengan basis sumber listrik DC. Baterai dan perangkat elektronik adalah perangkat berbasis listrik DC yang banyak dikembangkan dan membutuhkan suplai tegangan yang stabil. Jika tegangan tidak stabil maka membuat perangkat menjadi panas, masa penggunaan (lifetime) berkurang bahkan bisa rusak. Untuk itu peran regulator stabilitas tegangan sangat penting pada perangkat berbasis listrik DC. Permasalahan tersebut dibahas dalam penelitian ini menggunakan buck converter sebagai stabilitas tegangan untuk pengisian baterai. Pada penelitian ini, dilakukan dua pengujian konverter yaitu tanpa umpan balik tegangan dan dengan umpan balik tegangan. Hasil pengujian konverter tanpa umpan balik tegangan pada variasi tegangan masukan maksimal 30 V memiliki penurunan tegangan dari beban 390 Ω ke 50 Ω sebesar 5,528 V. Kemudian pada pengujian konverter dengan umpan balik tegangan, nilai tegangan keluaran dapat dijaga konstan sebesar 13,8 V dengan variasi beban 390 Ω ke 50 Ω dan deviasi rata-rata 0,001 volt. Efisiensi rata – rata buck converter dengan umpan balik tegangan pada variasi beban 390 Ω ke 50 Ω adalah 70,094%. Pengujian dengan menggunakan kontrol umpan balik tegangan pada konverter arus searah tipe buck converter menghasilkan nilai tegangan yang lebih stabil dibandingkan pengujian konverter tanpa umpan balik tegangan.

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UCHIDA, A., T. SATO, S. YOSHIMORI, and F. KANNARI. "TRANSIENT CHARACTERISTICS BETWEEN PERIODIC ATTRACTORS STABILIZED BY CHAOS CONTROL IN A SEMICONDUCTOR LASER." International Journal of Bifurcation and Chaos 13, no. 05 (May 2003): 1309–17. http://dx.doi.org/10.1142/s0218127403007254.

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We investigate the transient response time between periodic attractors stabilized by chaos control methods in a semiconductor laser. We use the revised occasional proportional feedback (ROPF) method to shorten the transient response time and compare it with the high frequency injection (HFI) method. A chaotic attractor is stabilized resulting in two different periodic attractors (period-1 and period-6) under different control parameters, and the transient response time is measured as one of the stabilized periodic attractors is switched to the other. During the transition, the trajectory approaches a certain unstable periodic orbit (UPO), and the distance between the trajectory in the phase space and the UPO can be described as an exponential function of the transient response time. Since the trajectory can directly converge into the periodic orbit by using the ROPF method, the transient response time obtained by the ROPF method can be shortened more than that obtained by the HFI method.

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Dissertations / Theses on the topic "Transient Stabilitet"

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Magnus, Olofsson. "Undersökning av transient stabilitet i matningssystem för elektrisk tågdrift." Thesis, KTH, Elkraftteknik, 1989. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156241.

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Söderström, Sebastian. "Simplified Model For Simulation of Fault Ride Through at Hydropower Units." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-445855.

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As new requirements for grid connected generators were implemented, the requirements for evaluating the Fault Ride Through capabilities of the generators became stricter. When refurbishing a power unit, proof that the power unit meet the requirements must be submitted to the authorities. Performing simulations of the Fault Ride Through of a production unit is an extensive process and requires advanced simulation models and tools. Therefore, the need for a simplified tool for estimating the Fault Ride Through capability arose, which is what the project produced. Also, knowledge of which production module characteristics (such as the generator parameters, transformer and excitation system) have the largest effect on the Fault Ride Through time, would also be beneficial. Through the creation of Simulink simulation models of two hydropower stations and a sensitivity analysis of station parameters, the relative effect of the parameters on the Fault Ride Through time is estimated and implemented into a time independent Fault Ride Through time estimation tool, based on the Equal Area criterion. The purpose of the time-independent Fault Ride Through time estimation tool is to provide an insight into the approximate transient stability of the hydropower station and which parameters affect the performance the most. Simulations show that the transient reactance of the generator, the generator inertia, the transient time constant and the transformer inductance have the largest effect on the Fault Ride Through capability. The results show that a simplified tool cannot estimate the Fault Ride Through as accurately as a time-domain simulation model can.

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Peltonen, Joanna. "Effective Spatial Mapping for Coupled Code Analysis of Thermal–Hydraulics/Neutron–Kinetics of Boiling Water Reactors." Doctoral thesis, KTH, Kärnkraftsäkerhet, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-122088.

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Analyses of nuclear reactor safety have increasingly required coupling of full three dimensional neutron kinetics (NK) core models with system transient thermal–hydraulics (TH) codes. In order to produce results within a reasonable computing time, the coupled codes use two different spatial description of the reactor core. The TH code uses few, typically 5 to 20 TH channels, which represent the core. The NK code uses explicit one node for each fuel assembly. Therefore, a spatial mapping of a coarse grid TH and a fine grid NK domain is necessary. However, improper mappings may result in loss of valuable information, thus causing inaccurate prediction of safety parameters. The purpose of this thesis is to study the effectiveness of spatial coupling (channel refinement and spatial mapping) and develop recommendations for NK/TH mapping in simulation of safety transients. Additionally, sensitivity of stability (measured by Decay Ratio and Frequency) to the different types of mapping schemes, is analyzed against OECD/NEA Ringhals–1 Stability Benchmark data. The research methodology consists of spatial coupling convergence study, by increasing the number of TH channels and varying mapping approaches, up to and including the reference case. The reference case consists of one-to-one mapping: one TH channel per one fuel assembly. The comparisons of the results are done for steady–state and transient results. In this thesis mapping (spatial coupling) definition is formed and all the existing mapping approaches were gathered, analyzed and presented. Additionally, to increase the efficiency and applicability of spatial mapping convergence, a new mapping methodology has been proposed. The new mapping approach is based on hierarchical clustering method; the method of unsupervised learning that is adopted by many researchers in many different scientific fields, thanks to its flexibility and robustness. The proposed new mapping method turns out to be very successful for spatial coupling problem and can be fully automatized allowing for significant time reduction in mapping convergence study. The steady–state results obtained from three different plant models for all the investigated cases are presented. All models achieved well converged steady–state and local parameters were compared and it was concluded that solid basis for further transient analysis was found. Analyzing the mapping performance, the best predictions for steady–state conditions are the mappings that include the power peaking factor feature alone or with any combination of other features. Additionally it is of value to keep the core symmetry (symmetry feature). The big part of this research is devoted to transient analysis. The selection of transients was done such that it covers a wide range of transients and gathered knowledge may be used for other types of transients. As a representative of a local perturbation, Control Rod Drop Accident was chosen. A specially prepared Feedwater Transient was investigated as a regional perturbation and a Turbine Trip is an example of a global one. In the case of local perturbation, it has been found that a number of TH channels is less important than the type of mapping, so a high number of TH channels does not guarantee improved results. To avoid unnecessary averaging and to obtain the best prediction, hot channel and core zone where accident happens should be always separated from the rest. The best performance is achieved with mapping according power peaking factors, and therefore this one is recommended for such type of perturbation. The regional perturbation has been found to be more challenging than the others. This kind of perturbation is strongly dependent on mapping type that affects the power increase rate, SCRAM time, onset of instability, development of limit cycle, etc. It has been also concluded that a special effort is needed for input model preparation. In contrast to the regional perturbation, the global perturbation is found to be the least demanding transient. Here, the number of TH channels and type of mapping do not have significant impact on average plant behaviour – general plant response is always well recreated. A special effort has also been paid to investigate the core stability performance, in both global and regional mode. It has been found that in case of unstable cores, a low number of TH channels significantly suppresses the instability. For these cases number of TH channels is very important and therefore at least half of the core has to be modeled to have a confidence in predicted DR and FR. In case of regional instability in order to get correct performance of out-of-phase oscillations, it is recommended to use full-scale model. If this is not possible, the mapping which is a mixture of 1st power mode and power peaking factors, should be used. The general conclusions and recommendations are summarized at the end of this thesis. Development of these recommendations was one of the purposes of this investigation and they should be taken into consideration while designing new coupled TH/NK models and choosing mapping strategy for a new transient analysis.

QC 20130516

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Karimishad, Amir. "Transient stability-constrained load dispatch, ancillary services allocation and transient stability assessment procedures for secure power system operation." University of Western Australia. Energy Systems Centre, 2008. http://theses.library.uwa.edu.au/adt-WU2009.0028.

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[Truncated abstract] The present thesis is devoted to the development of new methods for transient stability-constrained optimal power flow, probabilistic transient stability assessment and security-constrained ancillary services allocation. The key objective of the thesis is to develop novel dispatch and assessment methods for power systems operation in the new environment of electricity markets to ensure power systems security, particularly transient stability. A new method for economic dispatch together with nodal price calculations which includes transient stability constraints and, at the same time, optimises the reference inputs to the Flexible AC Transmission System (FACTS) devices for maintaining power systems transient stability and reducing nodal prices is developed. The method draws on the sensitivity analysis of time-domain transient stability simulation results to derive a set of linearised stability constraints expressed in terms of generator active powers and FACTS devices input references. '...' The low computing time requirement of the two-point estimate method allows online applications, and the use of detailed power systems dynamic model for time-domain simulation which offers high accuracy. The two-point estimate method is integrated in a straightforward manner with the existing transient stability analysis tools. The integrated software facility has potential applications in control rooms to assist the system operator in decision making process based on instability risks. The software system when implemented on a cluster of processors also makes it feasible to re-assess online transient stability for any change in system configuration arising from switching control. The method proposed has been tested on a representative power system and validated using the Monte Carlo simulation. In conjunction with the energy market, by which forecasted load demand is met by generator dispatch, ancillary services are required in relation to control for secure system operation and power quality. The final part of the thesis has a focus on the key aspect of allocating these ancillary services, subject to an important constraint that the dispatch of the ancillary services will not impair the system security achieved in the load dispatch. With this focus and requirement, the thesis develops a new dispatch formulation in which the network security constraints are represented in the optimal determination of generator active power schedule and allocation of ancillary services. Contingencies considered include power demand variations at individual load nodes from the values specified for the current dispatch calculation. The required changes in generator active powers to meet the new load demands are represented by additional control variables in the new dispatch formulation which augment those variables in the traditional OPF dispatch calculation. Based on the Lagrange function which includes the extended set of security constraints, the formulation derives the optimality condition to be satisfied by the dispatch solution, together with the marginal prices for individual ancillary service providers and LMPs. The effects of the security constraints are investigated and discussed. Case studies for representative power systems are presented to verify the new dispatch calculation procedure.

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Gonzalez-Torres, Juan Carlos. "Transient stability of high voltage AC-DC electric transmission systems." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS041.

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Les nouvelles politiques adoptées par les autorités nationales ont encouragé pendant les dernières années l'intégration à grande échelle des systèmes d'énergie renouvelable (RES). L'intégration à grande échelle des RES aura inévitablement des conséquences sur le réseau de transport d'électricité tel qu'il est conçu aujourd'hui, car le transport de l'électricité massif sur de longues distances pourrait amener les réseaux de transport à fonctionner près de leurs limites, réduisant ainsi leurs marges de sécurité. Des systèmes de transport d’électricité plus complexes seront donc nécessaires.Dans ce scénario, les systèmes de transmission à Courant Continu Haute Tension (HVDC) constituent la solution la plus intéressante pour le renforcement et l'amélioration des réseaux à Courant Alternatif (AC) existants, non seulement en utilisant des configurations point à point, mais aussi dans des configurations multi-terminales. L'introduction des systèmes HVDC aboutira à terme à un réseau électrique hybride haute tension AC/DC, qui doit être analysé comme un système unique afin de mieux comprendre les interactions entre le réseau AC et le réseau DC.Cette thèse porte sur l'analyse de la stabilité transitoire des systèmes de transmission électrique hybrides AC/DC. Plus particulièrement, deux questions ont été abordées: Quel est l'impact d'un défaut du réseau DC sur la stabilité transitoire du réseau AC? Comment est-il possible de se servir des systèmes de transmission DC en tant qu'actionneurs afin d'améliorer la stabilité transitoire AC ?Dans la première partie de ce travail, les modèles mathématiques du réseau hybride AC/DC sont décrits ainsi que les outils nécessaires à l'analyse du système en tenant compte de sa nature non linéaire. Ensuite, une analyse approfondie de la stabilité transitoire du réseau électrique dans le cas particulier d'un court-circuit dans le réseau DC et l'exécution des stratégies de protection correspondantes sont effectuées. En complément, des indicateurs de stabilité et des outils pour dimensionner les futurs réseaux de la MTDC afin de respecter les contraintes des stratégies de protection existantes sont proposés.La deuxième partie de la thèse porte sur les propositions de commande pour la modulation des références de puissance des systèmes de transmission HVDC dans le but d'améliorer la stabilité transitoire du système AC connecté à ce réseau DC. Tout d'abord, nous axons notre étude sur le contrôle non linéaire des liaisons HVDC point à point dans des liaisons hybrides AC/DC. La compensation rapide des perturbations de puissance, l'injection de puissance d'amortissement et l'injection de puissance de synchronisation sont identifiées comme des mécanismes par lesquels les systèmes HVDC peuvent améliorer les marges de stabilité des réseaux AC.Enfin, une stratégie de contrôle pour l'amélioration de la stabilité transitoire par injection de puissance active dans par un réseau MTDC est proposée. Grâce à la communication entre les stations, la commande décentralisée proposée injecte la puissance d'amortissement et de synchronisation entre chaque paire de convertisseurs en utilisant uniquement des mesures au niveau des convertisseurs. L'implémentation proposée permet d'utiliser au maximum la capacité disponible des convertisseurs en gérant les limites de puissance d'une manière décentralisée
The new policy frameworks adopted by national authorities has encouraged the large scale-integration of Renewable Energy Systems (RES) into bulk power systems. The large-scale integration of RES will have consequences on the electricity transmission system as it is conceived today, since the transmission of bulk power over long distances could lead the existing transmission systems to work close to their limits, thus decreasing their dynamic security margins. Therefore more complex transmissions systems are needed.Under this scenario, HVDC transmission systems raise as the most attractive solution for the reinforcement and improvement of existing AC networks, not only using point-to-point configurations, but also in a Multi-Terminal configuration. The introduction of HVDC transmission systems will eventually result in a hybrid high voltage AC/DC power system, which requires to be analyzed as a unique system in order to understand the interactions between the AC network and the DC grid.This thesis addresses the transient stability analysis of hybrid AC/DC electric transmission systems. More in particular, two questions sought to be investigated: What is the impact of a DC contingency on AC transient stability? How can we take advantage of the of DC transmission systems as control inputs in order to enhance AC transient stability?In the first part of this work, the mathematical models of the hybrid AC/DC grid are described as well as the necessary tools for the analysis of the system taking into account its nonlinear nature. Then, a thorough analysis of transient stability of the power system in the particular case of a DC fault and the execution of the corresponding protection strategies is done. As a complement, stability indicators and tools for sizing future MTDC grids in order to respect the constraints of existing protection strategies are proposed.The second part of the thesis addresses the control proposals for the modulation of power references of the HVDC transmission systems with the purpose of transient stability enhancement of the surrounding AC system. Firstly, we focus our study in the nonlinear control of point-to-point HVDC links in hybrid corridors. Fast power compensation, injection of damping power and injection of synchronizing power are identified as the mechanisms through which HVDC systems can improve stability margins.Finally, a control strategy for transient stability enhancement via active power injections of an MTDC grid is proposed. Using communication between the stations, the proposed decentralized control injects damping and synchronizing power between each pair of converters using only measurements at the converters level. The proposed implementation allows to fully use the available headroom of the converters by dealing with power limits in a decentralized way

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Couturier, Nicolas. "Transient Stability During Asymmetrical Faults." Thesis, KTH, Elektroteknisk teori och konstruktion, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-160521.

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This research project has been conducted at RTE in order to study the transient stability after asymmetrical faults. When three-phase short-circuits occur in a network, almost all the electrical power is lost on the relevant line(s). Among all short-circuit types, it is the most drastic event and the issue has to be solved very quickly. But oddly, it is also the easiest problem to solve mathematically speaking. This comes from the fact that the system stays balanced, and equations can be simplified. However with line-to-ground faults this is no longer the case, and transient stability analysis becomes tricky. Until now, unbalanced situations have not been studied much. Since this kind of trouble is less serious than losing all three phases, every protection devices on the network have been sized to counter three-phase faults in time and avoid severe consequences. They will then also work for onephase problems. Despite this, there is a desire from RTE to understand – physically and mathematically – what happens when one-phase faults occur, and it is the mission behind this master thesis. First, a mathematical theoretical model was derived to examine a network’s stability without running any simulation. Then, once simulation software programs were taken in hand, several tests were run on a very simplified network, and compared with the theory developed previously. Finally, these experiments were carried out on a much larger scale. It is important to understand that, except for the theoretical model, all the results and conclusions in this document come from simulations. Even if a lot of tests and models led to them, these conclusions must be handled with care. The goal of this work was also to have a better understanding of unbalanced systems, of the Fortescue representation and thus, understand more clearly the parameters required by simulation tools like Eurostag© for future studies.
Detta forskningsprojekt genomfördes hos RTE för att undersöka transientstabilitet efterosymmetriska fel. När trefasiga kortslutningar inträffar i en nätverk försvinner nästan all kraft i derelevanta ledningarna. Bland alla kortslutningstyper är detta den mest drastiska händelsen och måstelösas väldigt snabbt. Konstigt nog är det det lättaste problemet att lösa matematiskt. Detta på grundav faktumet att systemet förblir balanserat och ekvationer kan förenklas. Hursomhelst vid enfasigajordfel är detta inte längre fallet och transientstabilitetsanalys blir plötsligt svårt att räkna på. Fram tills nu har inte lösningar på obalanserade situationer studerats mycket. Eftersom denna typ avproblem är mindre allvarliga än att förlora alla tre faser, så har enheter på nätverket utformats för attmotverka trefas--‐fel snabbt och undvika allvarliga konsekvenser. Enheterna kommer då också fungeraför enfasproblem. Trots detta så finns det en önskan från RTE att förstå –fysiskt och matematiskt –vad som händer närett enfasproblem uppstår, det är det som är målet med mitt examensarbete. Först framtogs enmatematisk teoretisk modell för att examinera nätverkets stabilitet utan att köra någon simulation. Sedan med hjälp av mjukvarusimulatorer så utfördes flertalet test med den tidigare utveckladeteorin. I slutändan utfördes experimenten i en mycket större skala. Det är viktigt att förstå att, utom den teoretiska modellen, kommer alla resultat i denna rapportenfrån simuleringar. Även om flera tester och modeller ledde fram till dem, ska dessa slutsatserhanteras varsamt. Målet med detta arbete var att få bättre förståelse för obalanserade system, representationen med symmetriska komponenter och därmed, få en klarare förståelse för parametrarna som krävs avsimuleringssverktyg så som Eurostag© för framtida studier.

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Kwasnicki, Wieslaw T. "High Speed Transient Stability, multiprocessing solutions." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0024/NQ32881.pdf.

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Farantatos, Evangelos. "A predictive out-of-step protection scheme based on PMU enabled distributed dynamic state estimation." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45863.

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Recent widespread blackouts have indicated the need for more efficient and accurate power system monitoring, control and protection tools. Power system state estimation, which is the major tool that is used nowadays for providing the real-time model of the system, has significant biases resulting mainly from the complexity and geographic spread and separation of an electric power system. Synchrophasor technology is a promising technology that has numerous advantages compared to conventional metering devices. PMUs provide synchronized measurements, where synchronization is achieved via a GPS clock which provides the synchronizing signal with accuracy of 1 μsec. As a result, the computed phasors have a common reference (UTC time) and can be used in local computations, thus distributing the state estimation process. The first part of the work presents a PMU enabled dynamic state estimator (DSE) that can capture with high fidelity the dynamics of the system and extract in real time the dynamic model of the system. The described DSE is performed in a decentralized way, on the substation level based on local measurements which are globally valid. The substation based DSE uses data from relays, PMUs, meters, FDRs etc in the substation only, thus avoiding all issues associated with transmission of data and associated time latencies. This approach enables very fast DSE update rate which can go up to more than 60 executions per second. The distributed state estimation architecture that synchrophasor technology enables, along with the fast sampling rate and the accuracy of the measurements that PMUs provide, enable the computation of the real-time dynamic model of the system and the development of numerous power system applications for more efficient control and protection of the system. In the second part of the work, a transient stability monitoring scheme is presented that utilizes the information given by the dynamic state estimation and enables real-time monitoring of the transient swings of the system and characterizes the stability of the system in real time. In particular, the real-time dynamic model of the system, as given by the DSE, is utilized to evaluate the system's energy function based on Lyapunov's direct method and extract stability properties from the energy function. The two major components of the scheme are a) the calculation of the center of oscillations of the system and b) the derivation of an equivalent, reduced sized model which is used for the calculation of the potential and kinetic energy of the system based on which the stability of the system is determined. Finally, as an application of the transient stability monitoring scheme, an energy based out-of-step protection scheme is proposed. The energy of the generator is continuously monitored and if it exceeds a predefined threshold then instability is asserted and a trip signal can be sent to the generator. The major advantage of the scheme is that the out-of-step condition is predicted before its occurrence and therefore relays can act much faster than today's technology. The scheme is compared to presently available state of the art out-of-step protection schemes in order to verify its superiority.

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Niday, Thomas A. "Stability and transient effects in ultraviolet filaments." Diss., The University of Arizona, 2004. http://hdl.handle.net/10150/280637.

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Short, high intensity laser pulses induce nonlinear optical effects in the atmosphere that have the potential to make them propagate for long distances. Applications for long distance propagation of short pulses include active spectral remote sensing and laser lightning control. Much of the work in this field has been done with infrared pulses; however, it has been proposed that ultraviolet pulses have the advantage that longer pulse lengths can be used, thereby delivering more energy. Long pulse lengths lead to a simplified instantaneous model for the plasma response, which has been shown by Schwarz and Diels to admit steady state or oscillatory solutions corresponding to beam propagation. We have verified this model and have adjusted it to achieve closer agreement with numerical results. In this work we investigate the effects of transient behavior, and the stability of these solutions. Analysis of the modulational instability is done from the plane wave level to a full three dimensional model of the propagation. It is shown that both the transient behavior arising from the finite pulse length, and the modulational instability cause pulses to fragment over lengths on the scale of meters. We present results showing the growth of unstable modes in various propagation regimes. We discuss the pertinent length scales for ultraviolet pulses, as well as the impact of the instability and transient effects on theory and experiment. The results imply that continuous-wave models are very limited when used to predict dynamical properties of pulse propagation.

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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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Books on the topic "Transient Stabilitet"

1

Pavella, Mania, Damien Ernst, and Daniel Ruiz-Vega. Transient Stability of Power Systems. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4615-4319-0.

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Čemus, Jiří. Transient stability analysis of synchronous motors. Amsterdam: Elsevier, 1990.

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Čemus, Jiří. Transient stability analysis of synchronous motors. 2nd ed. Prague: Academia, 1994.

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Vijay, Vittal, ed. Power system transient stability analysis using the transient energy function method. Englewood Cliffs, N.J: Prentice Hall, 1992.

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Pavella, Mania. Transient stability of power systems: Theory and practice. Chichester: Wiley, 1994.

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Shuai, Zhikang. Transient Characteristics, Modelling and Stability Analysis of Microgird. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8403-9.

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Nuthalapati, Sarma (NDR), ed. Use of Voltage Stability Assessment and Transient Stability Assessment Tools in Grid Operations. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-67482-3.

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Mahmud, S. A. Effect of phase shifting transformer on power system transient stability. Manchester: UMIST, 1994.

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Electrical transients in power systems. 2nd ed. New York: Wiley Interscience, 1991.

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Martinez-Velasco, Juan A. Power system transients: Parameter determination. Boca Raton, FL: CRC Press, 2010.

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Book chapters on the topic "Transient Stabilitet"

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Voropai, Nikolai, and Constantin Bulac. "Transient Stability." In Handbook of Electrical Power System Dynamics, 570–656. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118516072.ch10.

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Kezunovic, Mladen, Sakis Meliopoulos, Vaithianathan Venkatasubramanian, and Vijay Vittal. "Online Transient Stability Assessment." In Power Electronics and Power Systems, 99–142. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-06218-1_4.

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Pavella, Mania, Damien Ernst, and Daniel Ruiz-Vega. "Background." In Transient Stability of Power Systems, 1–32. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4615-4319-0_1.

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Pavella, Mania, Damien Ernst, and Daniel Ruiz-Vega. "Introduction to SIME." In Transient Stability of Power Systems, 33–65. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4615-4319-0_2.

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Pavella, Mania, Damien Ernst, and Daniel Ruiz-Vega. "Sensitivity Analysis." In Transient Stability of Power Systems, 67–92. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4615-4319-0_3.

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Pavella, Mania, Damien Ernst, and Daniel Ruiz-Vega. "Preventive Analysis and Control." In Transient Stability of Power Systems, 93–137. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4615-4319-0_4.

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Pavella, Mania, Damien Ernst, and Daniel Ruiz-Vega. "Integrated TSA&C Software." In Transient Stability of Power Systems, 139–70. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4615-4319-0_5.

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Pavella, Mania, Damien Ernst, and Daniel Ruiz-Vega. "Closed-Loop Emergency Control." In Transient Stability of Power Systems, 171–88. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4615-4319-0_6.

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Pavella, Mania, Damien Ernst, and Daniel Ruiz-Vega. "Retrospect and Prospect." In Transient Stability of Power Systems, 189–206. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4615-4319-0_7.

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Aitchison Smith, David. "Transients, Stability and Oscillations." In The Sliding-Filament Theory of Muscle Contraction, 167–236. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-030-03526-6_5.

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Conference papers on the topic "Transient Stabilitet"

1

Soliman, Mohamed S. "Transient Vibrations of Nonlinear Systems: Global Dynamics and Chaotic Transients." In ASME 1993 Design Technical Conferences. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/detc1993-0126.

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Abstract In this paper a new approach in the global transient analysis of nonlinear systems is presented; it has the advantages of being conceptually simpler and at the same time more relevant than one based soley on a stability analysis of the steady-state motions. We address the problem of analysing the global transient stability of nonlinear systems in terms of basins of attraction. We show that at a forcing level that is considerably smaller than that at which the steady state attractor loses its stability, there may exist a rapid erosion and stratification of the basin, signifying a global loss of engineering integrity of the system. This conclusion is reinforced by the fact that basin boundaries can become fractal, resulting in chaotic transients, adding a new degree of uncertainty in the response. The techniques developed are then applied to a ship roll model with cubic and quintic nonlinearities as well as linear plus cubic damping characteristics.

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Ligarius, P., Nordine Mouhab, and L. Estel. "Modal Estimates and Stability Analysis of a Heat Exchanger Application. - A Laplace Transform Approach -." In International Symposium on Transient Convective Heat Transfer. New York: Begellhouse, 1996. http://dx.doi.org/10.1615/ichmt.1996.transientconvheattransf.300.

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Yue Yuan, J. Kubokawa, and H. Sasaki. "Pricing for transient stability." In 2004 IEEE International Conference on Electric Utility Deregulation, Restructuring and Power Technologies. Proceedings. IEEE, 2004. http://dx.doi.org/10.1109/drpt.2004.1338517.

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C.M, Khan, Chanda C.K, and Konar S.C. "Study Of Transient Stability By Transient Energy Function." In National Conference on Advancement of Computing in Engineering Research. Academy & Industry Research Collaboration Center (AIRCC), 2013. http://dx.doi.org/10.5121/csit.2013.3235.

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Sul, Hea Youn, Changhwan Cho, Jung-Yeul Jung, and Yong Tae Kang. "Thermal Conductivity Enhancement of Binary Nanoemulsion(O/S) for Absorption Application." In ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASMEDC, 2009. http://dx.doi.org/10.1115/mnhmt2009-18177.

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Binary nanoemulsions, oil-droplet suspensions in binary solution (H2O/LiBr), are developed to enhance the heat and mass transfer performance of absorption refrigeration cycles. This paper studies the formation and stability of n-decane in H2O/LiBr nanoemulsions produced by using polyoxyethylene lauryl ether and polyoxyethylene sorbitan monolaurate as surfactant. To stabilize the nanoemulsions in a strong electrolyte, polymeric stabilizer (gum Arabic) is used as a steric stabilizer. The droplet size and the thermal conductivity of binary nanoemulsions are measured by the dynamic light scattering method and the transient hot-wire method, respectively. It is found that the effective thermal conductivity of binary nanoemulsions (1.0 vol % of n-decane in 30 wt % H2O/LiBr) enhances up to 3.59% with the average droplet size of 44.3 nm. The stability has more significant effect on the thermal conductivity enhancement than the initial drop size.

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Yang, Songhao, Xinkai Fan, Baohui Zhang, Zhiguo Hao, and Hojo Masahide. "A Unified Scheme for Power System Transient Stability Simulation and Transient Stability Assessment." In 2019 IEEE 8th International Conference on Advanced Power System Automation and Protection (APAP). IEEE, 2019. http://dx.doi.org/10.1109/apap47170.2019.9224848.

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Guo Chunlin and Xiao Xiangning. "Transient stability control of TCSC." In 2009 4th IEEE Conference on Industrial Electronics and Applications (ICIEA). IEEE, 2009. http://dx.doi.org/10.1109/iciea.2009.5138432.

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Swaroopan, N. M. J., and P. Somasundaram. "Transient stability enhancement with UPFC." In IET-UK International Conference on Information and Communication Technology in Electrical Sciences (ICTES 2007). IEE, 2007. http://dx.doi.org/10.1049/ic:20070665.

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Kiss, A., and Z. Spakovszky. "Effects of Transient Heat Transfer on Compressor Stability." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-75413.

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The effects of heat transfer between the compressor structure and primary gas path flow on compressor stability are investigated during hot engine re-acceleration transients, or so called “Bodie” transients. A mean line analysis of an advanced, high-pressure ratio compressor is extended to include the effects of heat transfer on both stage matching and blade row flow angle deviation. A lumped capacitance model is used to compute the heat transfer of the compressor blades, hub, and casing to the primary gas path. The inputs to the compressor model with heat transfer are based on a combination of full engine data, compressor test rig measurements, and detailed heat transfer computations. Transient calculations with heat transfer show a 8.0 point reduction in stall margin from the adiabatic case, with heat transfer predominantly altering the transient stall line. 3.4 points of the total stall margin reduction are attributed to the effect of heat transfer on blade row deviation and the remainder is attributed to stage re-matching. It is found that heat transfer increases loading in the front stages and destabilizes the front block. Furthermore, the stage re-matching due to heat transfer alters the slope of the compressor characteristic and promotes modal-type stall inception. Sensitivity studies show a strong dependence of stall margin to heat transfer magnitude and flow angle deviation at low speed, due to the effects of compressibility. Computations for the same transient using current cycle models with bulk heat transfer effects, such as NPSS, only capture 1.2 points of the 8.0 point stall margin reduction. This implies that, using this new capability, opportunities exist early in the design process to address potential stability issues due to transient heat transfer.

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Khalil, Zakaria Ebrahim, Abd El-Fath El-Said Eliwa, and Waheed Sabry. "A Design of a Modified Power System Stabilizer for Power System Transient Stability Enhancement." In 2018 Twentieth International Middle East Power Systems Conference (MEPCON). IEEE, 2018. http://dx.doi.org/10.1109/mepcon.2018.8635297.

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Reports on the topic "Transient Stabilitet"

1

Hiskens, Ian A. Strategies for Voltage Control and Transient Stability Assessment. Office of Scientific and Technical Information (OSTI), September 2013. http://dx.doi.org/10.2172/1094977.

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Gehrke, V., and S. G. Bankoff. Stability of forced-convection subcooled boiling in steady-state and transient annular flow. Office of Scientific and Technical Information (OSTI), June 1993. http://dx.doi.org/10.2172/10194741.

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Miller, N. W., M. Shao, S. Pajic, and R. D'Aquila. Western Wind and Solar Integration Study Phase 3 – Frequency Response and Transient Stability. Office of Scientific and Technical Information (OSTI), December 2014. http://dx.doi.org/10.2172/1167065.

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