1,720,973 research outputs found
Discrete-time Switched Systems: Pole Location And Structural Constrained Control
No full textThis paper addresses the problem of state feedback control of discrete-time switched systems with linear modes of operation. Sufficient linear matrix inequality conditions are given for the existence of a state feedback control law assuring: i) pole location inside a circle for each linear mode of operation; ii) overall stability for any arbitrarily fast switching sequence. Two feedback control laws are investigated: the first one with a fixed gain for all linear modes and the second using a switched gain. Moreover, structural constraints such as decentralization can be easily imposed to the feedback gains. Simulation results show that with the switched gain more stringent design specifications can be imposed to the closed-loop system, providing closed-loop performances that cannot be produced by means of a constant feedback gain.662426247Sanders, S.R., Verghese, G.C., Lyapunov-based control for switched power converters (1992) IEEE Transactions on Power Electronics, 7 (1), pp. 17-24Sira-Ramirez, H., Nonlinear P-I controller design for switched mode dc-to-dc power converters (1991) IEEE Transactions on Circuits and Systems, 38 (4), pp. 410-417. , AprilDecarlo, R.A., Branicky, M.S., Pettersson, S., Lennartson, B., Perspectives and results on the stability and stabilizability of hybrid systems (2000) Proceedings of the IEEE, 88, pp. 1069-1082. , JulySavkin, A.V., Evans, R.J., (2002) Hybrid Dynamical Systems. Controller and Sensor Switching Problems, , Birkhäuser, Boston, MABarmish, B.R., Necessary and sufficient conditions for quadratic stabilizability of an uncertain system (1985) Journal of Optimization Theory and Applications, 46 (4), pp. 399-408. , AugustBernussou, J., Peres, P.L.D., Geromel, J.C., A linear programming oriented procedure for quadratic stabilization of uncertain systems (1989) Systems & Control Letters, 13 (1), pp. 65-72. , JulyGeromel, J.C., Peres, P.L.D., Bernussou, J., On a convex parameter space method for linear control design of uncertain systems (1991) SIAM Journal on Control and Optimization, 29 (2), pp. 381-402. , MarchFeng, G., Stability analysis of piecewise discretetime linear systems (2002) IEEE Transactions on Automatic Control, 47 (7), pp. 1108-1112. , JulyMignone, D., Ferrari-Trecate, G., Morari, M., Stability and stabilization of piecewise affine and hybrid systems: An LMI approach (2000) Proceedings of the 39th IEEE Conference on Decision and Control, 1, pp. 504-509Rantzer, A., Johansson, M., Piecewise linear quadratic optimal control (2000) IEEE Transactions on Automatic Control, 45 (4), pp. 629-637. , AprilDaafouz, J., Riedinger, P., Iung, C., Stability analysis and control synthesis for switched systems: A switched Lyapunov function approach (2002) IEEE Transactions on Automatic Control, 47 (11), pp. 1883-1887. , NovemberDaafouz, J., Bernussou, J., Parameter dependent Lyapunov functions for discrete time systems with time varying parameter uncertainties (2001) Systems & Control Letters, 43 (5), pp. 355-359. , AugustDaafouz, J., Riedinger, P., Iung, C., Stabilizing switched control design and pole placement (2003) IFAC Conference on Analysis and Design of Hybrid Systems (ADHS03), , Saint Malo, France, JuneChilali, M., Gahinet, P., Apkarian, P., Robust pole placement in LMI regions (1999) IEEE Transactions on Automatic Control, 44 (12), pp. 2257-2270. , DecemberHaddad, W.M., Bernstein, D.S., Controller design with regional pole constraints (1992) IEEE Transactions on Automatic Control, 37 (1), pp. 54-69. , JanuaryLeite, V.J.S., Montagner, V.F., Peres, P.L.D., Robust pole location by parameter dependent state feedback control (2002) Proceedings of the 41st IEEE Conference on Decision and Control, pp. 1864-1869. , Las Vegas, DecemberDe Oliveira, M.C., Bernussou, J., Geromel, J.C., A new discrete-time robust stability condition (1999) Systems & Control Letters, 37 (4), pp. 261-265. , JulyPeres, P.L.D., Umezu, C.K., Guaitoli, G., H 2 control of uncertain discrete-time systems with regional pole constraints (1994) Proceedings of the 33rd IEEE Conference on Decision and Control, 1, pp. 565-570. , Lake Buena Vista, FL, DecemberChen, C.T., (1999) Linear System Theory and Design, , Oxford University Press, 3 editionPeres, P.L.D., Geromel, J.C., An alternate numerical solution to the linear quadratic problem (1994) IEEE Transactions on Automatic Control, 39 (1), pp. 198-202. , Januar
Robust ∞ Control For Grid Connected Pwm Inverters With Lcl Filters
No full textThis paper provides a robust control design based on linear matrix inequalities applied to PWM inverters with LCL filters connected to the grid under uncertain parameters. The proposed controller ensures: i) closed-loop robust stability against parameter uncertainty; ii) robust pole location with a prescribed ∞ guaranteed cost; iii) tracking of sinusoidal reference and rejection of disturbances. Simulation and experimental results show good transient and frequency responses for the closed-loop system, as well as limits of robust stability. © 2012 IEEE.Teodorescu, R., Liserre, M., Rodriguez, P., (2011) Grid Converters for P Hotovoltaic and Wind Power Systems, , ser. Wiley - IEEE. John Wiley & SonsPark, S.Y., Chen, C.L., Lai, J.S., Moon, S.R., Admittance compensation in current loop control for a grid-tie lcl fuel cell inverter (2008) IEEE Transactions on Power Electronics, 23 (4), pp. 1716-1723. , julyAgorreta, J., Borrega, M., Lopez, J., Marroyo, L., Modeling and control of n-paraueled grid-connected inverters with lcl filter coupled due to grid impedance in pv plants (2011) Power Electronics, IEEE Transactions on, 26 (3), pp. 770-785. , marchBina, M.T., Pashajavid, E., An efficient procedure to design passive lcl-filters for active power filters (2009) Electric Power Systems Research, 79 (4), pp. 606-614Tang, Y., Loh, P.C., Wang, P., Choo, F.H., Gao, F., Laabj Erg, F.B., Generalized design of high performance shunt active power filter with output lcl filter (2012) Industrial Electronics, IEEE Transactions on, 59 (3), pp. 1443-1452. , marchGreen, T., Prodanovic, M., Control of inverter-based micro-grids (2007) Electric Power Systems Research, 77 (9), pp. 1204-1213Mohamed, Y.-R., Mitigation of converter-grid resonance, grid-induced distortion, and parametric instabilities in converter-based distributed generation (2011) Power Electronics, IEEE Transactions on, 26 (3), pp. 983-996. , marchLaabj Erg, F.B., Teodorescu, R., Liserre, M., Timbus, A., Overview of control and grid synchronization for distributed power generation systems (2006) Industrial Electronics, IEEE Transactions on, 53 (5), pp. 1398-1409. , octDannehl, J., Liserre, M., Fuchs, F., Filter-based active damping of voltage source converters with filter (2011) Industrial Electronics, IEEE Transactions on, 58 (8), pp. 3623-3633. , augDannehl, J., Fuchs, F.W., Hansen, S., Thszgersen, P.B., Investigation of active damping approaches for pi-based current control of gridconnected pulse width modulation converters with lcl filters (2010) Industry Applications, IEEE Transactions on, 46 (4), pp. 1509-1517. , jUly-augCastilla, M., Miret, J., Matas, J., Vicuna De L.Garcia, Guerrero, J., Control design guidelines for single-phase grid-connected photovoltaic inverters with damped resonant harmonic compensators (2009) Industrial Electronics, IEEE Transactions on, 56 (11), pp. 4492-4501. , novShen, G., Zhu, X., Zhang, J., Xu, D., A new feedback method for pr current control of lcl-filter-based grid-connected inverter (2010) Industrial Electronics, IEEE Transactions on, 57 (6), pp. 2033-2041. , juneMohamed, Y.-R., A-Rahman, M., Seethapathy, R., Robust linevoltage sensorless control and synchronization of lcl-filtered distributed generation inverters for high power quality grid connection (2012) Power Electronics, IEEE Transactions on, 27 (1), pp. 87-98. , janGabe, I.J., Montagner, V.F., Pinheiro, H., Design and implementation of a robust current controller for vsi connected to the grid through an lcl-filter (2009) IEEE Transactions on Power Electronics, 24, pp. 1444-1452Massing, J.R., Pinheiro, H., Montagner, V.F., Oliveira, R.C.L.F., Robust current control of grid-connected converters with lcl-filter (2011) XI Brazilian Power Electronics Conference (COBEP), Natal, RN, Brazil, pp. 244-248. , SeptemberBoyd, S., Ghaoui, L.E.I., Feron, E., Balakrishnan, V., (1994) Linear Matrix Inequalities in System and Control Theory, , Philadelphia, PA: SIAM Studies in Applied MathematicsFrancis, B.A., Doyle, J.C., Linear control theory with an hoo optimality criterion (1987) SIAM Journal on Control and Optimization, 25 (4), pp. 815-844. , JulyKhargonekar, P.P., Petersen, I.R., Rotea, M.A., Hoo-optimal control with state-feedback (1988) IEEE Transactions on Automatic Control, 33 (8), pp. 786-788Gahinet, P., Apkarian, P., A linear matrix inequality approach to noo control (1994) International Journal of Robust and Nonlinear Control, 4 (4), pp. 412-448. , July-AugustGeromel, J.C., De Oliveira, M.C., N2 and noo robust filtering for convex bounded uncertain systems (2001) IEEE Transactions on Automatic Control, 46 (1), pp. 100-107. , JanuaryGeromel, I.C., Peres, P.L.D., Souza, S.R., Noo guaranteed cost control for uncertain discrete-time linear systems (1994) IEEE Transactions on Automatic Control, 39 (5), pp. 1072-1075. , MayDe Oliveira, M.C., Skelton, R.E., Stability tests for constrained linear systems (2001) Perspectives in Robust Control, Ser. Lecture Notes in Control and Information Science, 268, pp. 241-257. , S. O. Reza Moheimani, Ed. New York: Springer-VerlagDaafouz, J., Bernussou, J., Poly-quadratic stability and noo performance for discrete systems with time varying uncertainties (2001) Proceedings of the 40th IEEE Conference on Decision and Control, 1, pp. 267-272Zmood, D.N., Holmes, D.G., Stationary frame current regulation of pwm inverters with zero steady-state error (2003) Power Electronics, IEEE Transactions on, 18 (3), pp. 814-822. , MayGabe, I.J., Massing, J.R., Montagner, V.F., Pinheiro, H., Stability analysis of grid-connected voltage source inverters with lcl-filters using partial state feedback (2007) Power Electronics and Applications, 2007 European Conference on, pp. 1-10. , sep
A Dlqr Applied To Boost Converters With Switched Loads: Design And Analysis
No full textConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)In this paper, the design and the experimental validation of a discrete linear quadratic regulator applied to boost converters with switched loads are investigated. The closed-loop system stability under arbitrary switching is ensured by means of the existence of a switched Lyapunov function, obtained by means of linear matrix inequalities, which is the main contribution of this work. The control law is implemented using a digital signal processor. Experimental results reveal the good transient and steady state performances as well as demonstrate a strong correspondence with the simulation, proving the practical viability of the proposed procedure. © 2011 IEEE.6873CAPES,Cons. Nac. Desenvolv. Cient. Tecnol. (CNPq),CREDSUPER/UNICRED - Filiada ao Sistema,IEEE Power Electronics Society (PELS),FAPERNConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Kolokolov, Y.V., Koschinsky, S.L., Hamzaoui, A., Comparative study of the dynamics and overall performance of boost converter with conventional and fuzzy control in application to PFC (2004) 2004 IEEE 35th Annual Power Electronics Specialists Conference, 2004. PESC 04, pp. 2165-2171Baggio, J.E., Hey, H.L., Grundling, H.A., Pinheiro, H., Pinheiro, J.R., Discrete control for three-level boost PFC converter (2002) 24th Annual International Telecommunications Energy Conference, pp. 627-633Sartori, H.C., Hey, H.L., Pinheiro, J.R., An optimum design of PFC boost converters (2009) 13th European Conference on Power Electronics and Applications, 2009. EPE '09, pp. 1-10Kassakian, J.G., Schlecht, M.F., Verghese, G.C., (1991) Principles of Power Electronics, , Reading, Mass.: Addison-WesleyPalma, L., Todorovic, M.H., Enjeti, P., Design considerations for a fuel cell powered DC-DC converter for portable applications (2006) Twenty-first Annual IEEE Applied Power Electronics Conference and Exposition, 2006. APEC '06, p. 6Benavides, N.D., Chapman, P.L., Mass-optimal design methodology for DC-DC converters in low-power portable fuel cell applications (2008) IEEE Transactions on Power Electronics, 23, pp. 1545-1555Deaecto, G.S., Geromel, J.C., Garcia, F.S., Pomilio, J.A., Switched affine systems control design with application to DC-DC converters (2010) IET Control Theory & Applications, 4, pp. 1201-1210Olalla, C., Leyva, R., El Aroudi, A., Queinnec, I., Robust LQR control for PWM converters: An LMI approach (2009) IEEE Transactions on Industrial Electronics, 56, pp. 2548-2558Garcia, F.S., Pomilio, J.A., Deaecto, G.S., Geromel, J.C., Analysis and control of DC-DC converters based on lyapunov stability theory (2009) IEEE Energy Conversion Congress and Exposition, 2009. ECCE 2009, pp. 2920-2927Poudeh, M.B., Eshtehardiha, S., Ershadi, M.H., Optimizing the classic controllers to improve the cûk converter performance based on genetic algorithm (2008) International Conference on Smart Manufacturing Application, 2008. ICSMA 2008, pp. 329-334Liping, G., Hung, J.Y., Nelms, R.M., Evaluation of DSP-based PID and fuzzy controllers for DC/DC converters (2009) IEEE Transactions on Industrial Electronics, 56, pp. 2237-2248Antsaklis, P.J., Michel, A.N., (2007) A Linear Systems Primer, , London: BirkhäuserDorf, R.C., Bishop, R.H., (2008) Modern Control Systems, , 11 th ed. Upper Saddle River, NJ: Pearson/Prentice HallFranklin, G.F., Powell, J.D., Workman, M.L., (1998) Digital Control of Dynamic Systems, , 3 rd ed. Menlo Park, Calif.: Addison-WesleyDupont, F.H., Montagner, V.F., Pinheiro, J.R., Pinheiro, H., Bisogno, F.E., Oliveira, S.V.G., Péres, A., Design and comparative analysis of multiple controllers applied to DC DC converters with large load range (2010) 9th IEEE/IAS International Conference on Industry Applications, , São PauloMontagner, V.F., Leite, V.J.S., Peres, P.L.D., Design of a switched control with pole location constraints for a UPS system (2004) IEEE International Symposium on Industrial Electronics, pp. 441-446Montagner, V.F., Leite, V.J.S., Oliveira, R.C.L.F., Peres, P.L.D., State feedback control of switched linear systems: An LMI approach (2006) Journal of Computational and Applied Mathematics, 194, pp. 192-206. , OctHespanha, J.P., Liberzon, D., Morse, A.S., Overcoming the limitations of adaptive control by means of logic-based switching (2003) Systems & Control Letters, 49, pp. 49-65Liberzon, D., Morse, A.S., Basic problems in stability and design of switched systems (1999) IEEE Control Systems Magazine, 19, pp. 59-70Daafouz, J., Riedinger, P., Iung, C., Stability analysis and control synthesis for switched systems: A switched lyapunov function approach (2002) IEEE Transactions on Automatic Control, 47, pp. 1883-1887Lee, J.W., Dullerud, G.E., Uniform stabilization of discrete-time switched and Markovian jump linear systems (2006) Automatica, 42, pp. 205-218. , FebDaafouz, J., Bernussou, J., Parameter dependent lyapunov functions for discrete time systems with time varying parametric uncertainties (2001) Systems & Control Letters, 43, pp. 355-359. , AugGahinet, P., Nemirovskii, A., Laub, A.J., Chilali, M., (1995) LMI Control Toolbox User's Guide, , Natick, MA: The Mathworks IncLofberg, J., YALMIP: A toolbox for modeling and optimization in MATLAB (2004) IEEE International Symposium on Computer Aided Control Systems Design, pp. 284-289Sturm, J.F., Using SeDuMi 1.02, a MATLAB toolbox for optimization over symmetric cones (1999) Optimization Methods & Software, 11 (2), pp. 625-653Ogata, K., (1995) Discrete-time Control Systems, , 2 ed. Englewood Cliffs: Prentice HallMontagner, V.F., Maccari Jr., L.A., Pinheiro, H., Oliveira, R.C.L.F., A robust H 2 state feedback controller applied to boost converters (2011) Eletrônica de Potência, 16, pp. 68-75Dupont, F.H., Montagner, V.F., Pinheiro, J.R., Pinheiro, H., Oliveira, S.V.G., Péres, A., Multiple controllers for boost converters under large load range: A GA and fuzzy logic based approach (2010) ICIT 2010. International Conference on Industrial Technologies, pp. 67-72. , Viña del Mar, Chil
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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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