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Anbukumar Kavitha,Govindarajan Uma 대한전기학회 2010 Journal of Electrical Engineering & Technology Vol.5 No.1
Resonant parametric perturbation (RPP) method is an effective non-feedback method for controlling chaos. In this paper, the above method is applied for the current programmed buck-boost dc-dc converter which exhibits chaotic for wide parameter variations. The different possible operating regimes leading to chaotic operation of the current mode controlled buck-boost converter is discussed and the control of chaos by RPP method is demonstrated through computer simulations and experimental studies. The converter is stabilized to period 1 operation practically.
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Control of Chaos in SEPIC DC-DC Converter
Anbukumar Kavitha,Govindarajan Uma 제어·로봇·시스템학회 2010 International Journal of Control, Automation, and Vol.8 No.6
DC-DC converters are widely used in power electronic systems where there is a need for stabilizing a given dc voltage to a desired value. It has been reported that DC-DC converters exhibit different non-linear phenomena including bifurcations, quasi-periodicity and chaos under both voltage mode and current mode control schemes. In this work, current mode controlled SEPIC converter operating in continuous conduction mode is considered and by varying the reference current Iref, the converter exhibits chaos. It has been observed that the system changes from a stable buck-like operation to an unstable boost-like operation by varying Iref. Bifurcation diagram is plotted for control signal and capacitor voltage with Iref as bifurcation parameter. Resonant parametric perturbation control tech-nique has been applied to suppress chaos. Effects of phase shift and frequency mismatch are also analyzed. With phase shift, control power required for suppressing chaos has been reduced. Also intermittent chaotic stages are suppressed with the effect of frequency mismatch at the expense of increasing control power. The stability analysis in SEPIC converter is performed by means of discrete model and is validated through the simulated and experimental results.
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Kavitha, Anbukumar,Uma, Govindarajan The Korean Institute of Electrical Engineers 2010 Journal of Electrical Engineering & Technology Vol.5 No.1
Resonant parametric perturbation (RPP) method is an effective non-feedback method for controlling chaos. In this paper, the above method is applied for the current programmed buck-boost dc-dc converter which exhibits chaotic for wide parameter variations. The different possible operating regimes leading to chaotic operation of the current mode controlled buck-boost converter is discussed and the control of chaos by RPP method is demonstrated through computer simulations and experimental studies. The converter is stabilized to period 1 operation practically.
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Wind tunnel study of a fish-plan shape model under different isolated wind incidences
Supriya Pal,Rahul Kumar Meena,Ritu Raj,S. Anbukumar 한국풍공학회 2021 Wind and Structures, An International Journal (WAS Vol.33 No.5
This paper presents the results of an experimental investigation performed at an open circuit boundary layer wind tunnel carried out with the purpose to evaluate the performance of a solitary “Fish-plan shape” building model for various angles of wind incidences with a mean wind velocity of 10 m/s and turbulence intensity of 12%. Mean pressur coefficients of all the faces are calculated from pressure values for each direction of wind incidence and pressure contours are plotted and explained in detail for all faces. Detailed analysis of peak and average mean pressure coefficient for each face is carried out. From the present experiment, it is observed that at 00 wind incidence face-value of the windward face is lesser than for the standard square model at IS 875 (Part 3) 2015. The study also presents higher magnitudes of peak suction and pressure coefficients at skewed angles of wind incidences i.e., 300, 600, 1200, and 1500 due to stagnation of fluid near the adjacent edge of depressed exposed faces. The magnitude of the overturning moment in across wind direction is dominating the overall behavior of the model due to the unsymmetrical cross-sectional shape of the model in across-wind direction. The orientation of the building at 900 to wind incidence should be avoided due to the peak magnitudes of CMD, CML, and CMT as compared to other wind directions.
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