1,720,972 research outputs found
Comparison Of Pss, Svc And Statcom For Damping Power System Local Mode Oscillations
No full textThis work investigates the effects of three controllers, the PSS (Power System Stabilizer), and two FACTS devices, namely SVC (Static VAR Compensator) and STATCOM (Static Synchronous Compensator), on small-signal power system angle stability. This investigation is carried out for a single machine connected to an infinite bus via a loss-less transmission line. The study is based on investigation of the eigenvalues of the linearized power system model in the framework of dynamic bifurcation theory. The simulations results presented enable a comparative analysis of the effects of these controllers on damping power systems low frequency electromechanical oscillations.533538Gyugyi, L., Converter-based FACTS controlers (1998) IEE Colloquium, pp. 1-11. , 23 NovMithulananthan, N., Canizares, C.A., Reeve, J., Rogers, G.J., Comparison of PSS, SVC, and STATCOM controllers for damping power system oscillations (2003) IEEE Transactions on Power Systems, 18 (2), pp. 786-792. , MayDeckmann, S.M., Da Costa, V.F., A power sensitivity model for electromechanical oscillation studies (1994) IEEE Transactions on Power Systems, 9 (2), pp. 965-971Nassif, A.B., Kopcak, I., Da Costa, V.F., Da Silva, L.C.P., Comparative analysis of SVC and STATCOM for damping power system low frequency electromechanical oscillations COBEP' 2003-7° Brazilian Congress of Power Electronics, pp. 646-650Hingorani, N.G., Gyugyi, L., (2000) Understanding FACTS: Concepts and Technology of Flexible AC Transmission Systems, , Jon Wiley & SonsCanizares, C.A., Faur, Z.T., Analysis of SVC and TCSC controllers in voltage collapse (1999) IEEE Transactions on Power Systems, 14 (1), pp. 158-165. , FebChun, L., Qirong, J., Xiarong, X., Zhonghong, W., Rule-based control for STATCOM to increase power system stability Proceedings of the International Conference on POWERCON '98, 1, pp. 372-37
A Procedure For Tuning Statcom Parameters For Damping Power System Oscillations
No full textThis work investigates the effects of the STATCOM (Static Synchronous Compensator), a FACTS (Flexible AC Transmission Systems) device, on small-signal power system angle stability. This investigation is carried out for a single machine connected to an infinite bus via a loss-less transmission line. The study is based on investigation of the eigenvalues of the linearized power system model in the framework of dynamic bifurcation theory. The tuning method of the STATCOM gains aiming the H2 norm minimization is briefly explained, and the presented simulations results enable an analysis of the effects of this controller for damping power systems low frequency electromechanical oscillations. Copyright © 2005 IFAC.163742Chun, L., Qirong, J., Xiarong, X., Zhonghong, W., Rule-based control for STATCOM to increase power system stability (1998) International Conference on Power System Technology, pp. 372-376Deckmann, S.M., Da Costa, V.F., A power sensitivity model for electromechanical oscillation studies (1994) IEEE Transactions on Power Systems, 9 (2), pp. 965-971Gyugyi, L., Converter-based FACTS controlers (1998) IEE Colloquium, pp. 1-11Hingorani, N.G., Gyugyi, L., (2000) Understanding FACTS: Concepts and Technology of Flexible AC Transmission Systems, , Jon Wiley & SonsKundur, P., (1993) Power System Stability and Control, 1176p. , McGraw-HillMithulananthan, N., Canizares, A.C., Reeve, J., Rogers, J.G., Comparison of PSS, SVC, and STATCOM controllers for damping power system oscillations (2003) IEEE Transactions on Power Systems, 18 (2), pp. 786-792Nassif, A.B., Kopcak, I., Da Costa, V.F., Da Silva, L.C.P., Comparative analysis of SVC and STATCOM for damping power system low frequency electromechanical oscillations (2003) COBEP -7° Brazilian Congress of Power ElectronicsOliveira, M.C., Skelton, R.E., (2000) Stability Tests for Constrained Linear Systems, Perspectives on Robust Control, pp. 241-257. , Ed. London, England, Springer-VerlagYing, Y., Chen, J., Han, Y., STATCOM modeling and analysis in damping power system oscillations (2000) Energy Conversion Engineering Conference and Exhibit, 2000, (IECEC) 35th Intersociety, 2, pp. 756-762. , vol.
H2 Norm-oriented Statcom Tuning For Damping Power System Oscillations
No full textThis work is mainly concerned with the effects of the static synchronous compensator (STATCOM), a flexible AC transmission system (FACTS) controller, on small-signal power system angle stability. This investigation is carried out for both inter-area and local oscillations mode. The study is based on the investigation of the eigenvalues of the linearized power system models in the framework of dynamic bifurcation theory. The tuning method of the STATCOM gains aiming the H2 norm minimization is briefly explained, and the presented simulation results are sufficient to provide a comprehensive analysis of the effects of this controller for damping power systems low frequency electromechanical oscillations. Copyright © Taylor & Francis Inc.331213631383Kundur, P., (1994) Power System Stability and Control, , New York: McGraw-HillDe Mello, F.P., Concordia, C., Concept of synchronous machine stability as affected by excitation control (1969) IEEE T-PAS, 88, pp. 316-329Larsen, E.V., Wann, D.A.S., Applying power system stabilizer, parts I-III (1981) IEEE T-PAS, 100, pp. 3017-3046Hingorani, N.G., Gyugyi, L., (2000) Understanding FACTS: Concepts and Technology of Flexible AC Transmission Systems, , New York: IEEE PressGyugyi, L., Converter-based FACTS controllers (1998) IEE Colloquium, pp. 1-11. , 23 NovNassif, A.B., Kopcak, I., Da Costa, V.F., Da Silva, L.C.P., Comparative analysis of SVC and STATCOM for damping power system low frequency electromechanical oscillations (2003) 7th Brazilian Congress of Power Electronics, pp. 646-650Li, C., Jiang, Q., Wang, Z., Retzmann, D., Design of a rule-based controller for STATCOM (1998) Proceedings of the 24th Annual Conference of the IEEE, 1, pp. 467-472. , Industrial Electronics Society, 1998, IECON '98, 31 Aug.-4 SeptHaque, M.H., Improvement of first swing stability limit by utilizing full benefit of shunt FACTS devices (2004) IEEE Transactions on Power Systems, 19 (4), pp. 1894-1902Rahim, A.H.M.A., Ai-Baiyat, S.A., Maghrabi, H.M.A.C., Robust damping controller design for a static compensator (2002) IEE. Proc.-gener. Transm. Distrib., 149 (4), pp. 491-496Ying, Y., Chen, J., Han, Y., STATCOM modeling and analysis in damping power system oscillations (2000) 35th Intersociety Energy Conversion Engineering Conference and Exhibit (IECEC), 2, pp. 756-762. , 24-28 JulyHaqui, M.H., Kumkratug, P., Application of Lyapunov stability criterion to determine the control strategy of a STATCOM (2004) IEE. Proc.-gener. Transm. Distrib., 151 (3), pp. 415-420Uzunovic, E., Cañizares, C.A., Reeve, J., Fundamental frequency model of static synchronous compensator (1997) North American Symposium (NAPS), pp. 49-54Deckmann, S.M., Da Costa, V.F., A power sensitivity model for electromechanical oscillation studies (1994) IEEE Transactions on Power Systems, 9 (2), pp. 965-971De Oliveira, M.C., Skelton, R.E., Stability tests for constrained linear systems (2001) Perspectives on Robust Control, pp. 241-257. , S. O. Reza Moheimani (Ed.), London, England: Springer-VerlagNoroozian, M., Anderson, G., Damping of power system oscillations by use of controllable components (1994) IEEE Transactions on Power Delivery, 19 (4), pp. 2046-2054Yang, N., Liu, Q., McCalley, J.D., TCSC controller design for damping interarea oscillations (1998) IEEE Transactions on Power Systems, 13, pp. 1304-1310Martins, N., Pinto, H.J.C.P., Paserba, J.J., Using a TCSC for line power scheduling and system oscillation damping-small signal and transient stability studies (2000) IEEE PES Winter Meeting, 2, pp. 1455-1461. , 23-27 Ja
Preliminary Results On Improving The Modal Analysis Technique For Voltage Stability Assessment
No full textThis paper investigates the theoretical foundations and practical applications of the modal analysis technique applied to voltage stability assessment. Improvements are made to the existing technique. The results show that two reduced Jacobian matrices, one related to reactive power and the other related to active power, are needed for extracting complete modal information. There is no need to use a full Jacobian matrix for modal analysis. As a preliminary result, a technically sound generator participation factor index is proposed based on the findings.319461950Kundur, P., (1994) Power System Stability and Control, p. 1176. , New York: McGraw-HillTaylor, C., (1994) Power System Voltage Stability, p. 273. , New York: McGraw-HillVoltage stability of power systems concepts, analytical tools, and industry experience (1990), IEEE Special Publication, 90TH0358-2-PWRPal, M.K., Voltage stability conditions considering load characteristics (1992) IEEE Transactions on Power Systems, 7 (1), pp. 243-249Gao, B., Morison, G.K., Kundur, P., Voltage stability evaluation using modal analysis (1992) IEEE Trans. on Power Systems, 7 (4), pp. 1529-1542Mansour, Y., Xu, W., Alvarado, F., Rinzin, C., SVC placement and transmission line reinforcement using critical modes (1994) IEEE Trans. on Power Systems, 9 (2), pp. 757-763Morison, G.K., Gao, B., Kundur, P., Voltage stability analysis using static and dynamic approaches (1993) IEEE Trans. on Power Systems, 8 (3), pp. 1159-1171Aik, D.L.H., Andersson, G., Use of participation factors in modal voltage stability analysis of multi-infeed HVDC systems (1998) IEEE Trans. on Power Delivery, 13 (1), pp. 203-210Suggested techniques for voltage stability analysis (1993), IEEE Working Group on Voltage Stability, IEEE Power Eng. Society Report, 98TH0620-5PWRChiang, H.D., Flueck, A.J., Shah, K.S., Balu, N., CPFLOW: A practical tool for tracing power systems steady-state stationary behavior due to load and generation variations (1995) IEEE Trans. on Power Systems, 10 (2), pp. 623-633. , MayAlves, D.A., Da Silva, L.C.P., Castro, C.A., Da Costa, V.F., Parameterized fast decoupled load flow for tracing power systems bifurcation diagrams 1999 IEEE Power Engineering Society Summer Meeting, Edmonton, Canada, pp. 708-71
Transmission Systems Congestion Management By Using Modal Participation Factors
No full textPower system congestion management is a hard task, and the electricity industry restructuring process tends to difficult it even more. The competitive electric power market arises new congestion management perspectives and difficulties. This work demonstrates that modal analysis technique can be a powerful tool for defining corrective actions to overcome congestion problems. Extensive voltage stability margin assessment, for a test system, shows that modal participation factors allow the identification of congested areas, and also the most adequate active and reactive power based control actions to relieve congestion. © 2003 IEEE.2611Vournas, C.D., Interrupnble load as a competitor to local generation for preventing voltage security (2001) Power Engineering Society Winter Meeting, 1, pp. 236-240Shahidehpour, M., Alomoush, M., (2001) Restructured Electrical Power Systems: Operation, Trading, and Volatility, , New York: Marcel DeekkerDoorman, G.L., Optimal system security under capacity constrained conditions (2001) IEEE Porto Power Tech Proceeding, 2, 6pDa Silva, L.C.P., Da Costa, V.F.E., Xu, W., Preliminary results on improving the modal analysis technique for voltage stability assessment (2000) Proceedings of the IEEE PES Summer Meeting, , Seattle, USAGao, B., Morison, G.K., Kundur, P., Voltage stability evaluation using modal analysis (1992) IEEE Transactions on Power Systems, 7 (4), pp. 1529-1542Da Silva, L.C.P., Wang, Y., Da Costa, V.F., Xu, W., Assessment of generator impact on system power transfer capability using modal participation factors (2002) Proc. of IEE Generation, Transmission, and Distribution, 149 (5)(1998) Final Report: Voltage Stability Criteria, Undervoltage Load Shedding Strategy, and Reactive Power Reserve Monitoring Methodology, , http://www.wscc.com, WSCC Reactive Power Reserve Work GroupSuggested Techniques for voltage stability analysis (1993) IEEE Power Eng. Society Report, , IEEE Working Group on Voltage Stability, 98TH0620-5PWRTaylor, C., (1994) Power System Voltage Stability, p. 273. , New York: McGraw-HillAlmeida, P., Criteria and methodologies established in the ambit of GTAD/SCEL/GCOI Voltage Collapse Task Force for studies on voltage stability in the Brazilian North/Northeast, South/Southeast and North/South interconnected systems (2000) D3EE-PES Summer Meeting, pp. 531-53
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Impacts Of Facts Controllers On Damping Power Systems Low Frequency Electromechanical Oscillations
No full textThis paper presents a study comparing the effects of four flexible ac transmission systems (FACTS) controllers, the static var compensator (SVC), the static synchronous compensator (STATCOM), the thyristor controlled series compensator (TCSC) and the static synchronous series compensator (SSSC) on power systems small-signal angle stability. This investigation is carried out for a single generator connected to an infinite bus via a loss-less transmission line. The study is based on the investigation of the critical eigenvalues of the power system linearized model in the framework of the dynamic bifurcation theory. The presented simulation results allow a comparative analysis of the effects of these four controllers and reveal that the SSSC exhibits the best effectiveness on damping power systems low frequency electromechanical oscillations. ©2004 IEEE.291296Kundur, P., (1993) Power System Stability and Control, , Mc Graw-HillDeckmann, S.M., Da Costa, V.F., A power sensitivity model for electromechanical oscillation studies (1994) IEEE Transactions on Power Systems, 9 (2), pp. 965-971Gyugyi, L., Converter-based FACTS controlers (1998) IEE Colloquium, pp. 1-11. , 23 NovHingorani, N.G., Gyugyi, L., (2000) Understanding FACTS: Concepts and Technology of Flexible AC Transmission Systems, , John Wiley & SonsMithulananthan, N., Canizares, C.A., Reeve, J., Rogers, G.J., Comparison of PSS, SVC and STATCOM controllers for damping power system oscillations (2003) IEEE Transactions on Power Systems, 18 (2), pp. 786-792. , MayCanizares, C.A., Faur, Z.T., Analysis of SVC and TCSC controllers in voltage collapse (1999) IEEE Transactions on Power Systems, 14 (1), pp. 158-165. , FebRahim, A.H.M.A., Baiyat, S.A., Kandlawala, F.M., A robust STATCOM controller for power system dynamic performance enhancement (2001) IEEE Power Engineering Society Summer Meeting, 2, pp. 887-892. , 15-19 JulyChun, L., Qirong, J., Xiarong, X., Zhonghong, W., Rule-based control for STATCOM to increase power system stability (1998) Proceedings of International Conference on POWERCON 98, 1, pp. 372-376. , 18-21 AugDomingues, A.F., (2001) Aplicação de Dispositivos FACTS Para o Amortecimento de Oscilações Eletromecânicas de Baixa Freqüência em Sistemas de Energia Elétrica, , M.S.c dissertation, DSCE / FEEC / UNICAMPSong, Y.H., Johns, A.T., Flexible AC transmission systems (FACTS) (1999) Power and Energy Series, 30. , London, IEEGyugyi, L., Dynamic compensation of ac transmission line by solid-state synchronous voltage sources (1994) IEEE Transactions on Power Delivery, 9, pp. 904-911. , AprDuangkamol, K., Mitani, Y., Tsuji, K., Hojo, M., Fault current limiting and power system stabilization by static synchronous series compensator (2000) IEEE Power System Technology, 3, pp. 1581-1586. , DecKumkratug, P., Haque, M.H., Improvement of stability region and damping of a power system by using SSSC (2003) Power Engineering Society General Meeting 2003, 3, pp. 1710-1714. , 13-17 Jul
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