The structure multicellular converters, which appeared at the beginning of the 1990s, makes it possible to share the constraints in tension and it also improves the harmonic contents of the wave forms. To benefit as well as possible from the large potential of the multicellular structure, an appropriate distribution of the voltages crossing each cell is needed. These converters are drastically used in industry as well as in research. One of the main limitations of these converters is unregulated supply of voltage and current. To overcome these problems there are various control techniques used in combination with these converters. In this review we summarized few of these control techniques. Some well known control techniques are PID, sliding mode control and Petri nets control. We have also paid attention on the advantages and disadvantages of these techniques with basic operating principle.
In this paper, chaotic behavior investigation of two-cells chopper when it is associated with a nonlinear load is considered. The model of such system is described by a continuous time three dimensional non-autonomous system. The route to chaos is studied by using numerical simulations of two-cells chopper model. Moreover phase portraits; Poincaré section and first return map are analyzed to highlight the main characteristic of this particular chaotic behavior.
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This paper introduces a hyperchaotic system from the Lü system with a sinusoïdal perturbation. This hyperchaotic system has more complex dynamical behaviors, and can generate 2-scroll hyperchaotic attractor and 2-scroll chaotic attractor under different control parameters. Theoretical analyses and simulation are conducted to investigate the dynamical behaviors of the proposed hyperchaotic system by means of Lyapunov exponents, analysis of the bifurcation diagram and phase portraits.
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