Study On Nonlinear Behaviors And Chaotic Control In Higher Order Parallel Buck-Boost Converter

In recent years, for the simple DC-DC converter modules in parallel combination of higher order parallel DC-DC converter systems are attracted more and more attention.It is an important direction of exploration and research on power electronics field. Compared to higher order parallel DC-DC converter system with simple DC-DC converter system, It has a complex coupling, so its analysis is also more difficult. At present, for higher order parallel DC-DC converter system focused on exploring new design method. For the study on nonlinear behavior in higher order parallel DC-DC converter analysis and chaos control method is rarely reported in the literature. However, since the converter itself is strongly nonlinear system, which operating status vulnerable to circuit parameters, the bifurcation or chaotic phenomena will seriously affect the normal operation of equipment. Therefore, the study on nonlinear behavior of this new type of the converter using nonlinear dynamics theory, and to take effective control strategy in which Chaos, will improve the stability of the system.In light of this paper mainly completed the following several studies.Firstly Buck-Boost converter in current control mode as the research object, the establishment of a mathematical model of the system in continuous current mode, and through matlab / simulink software build system simulation module. It reveals the nonlinear dynamics of the converter in the simulation experiment, At the same time the experimental results verify the correctness of the mathematical analysis.Secondly derived Higher Order Parallel Buck-Boost converter circuit equation,its simulation model in matlab / simulink software environment, the simulation experiment explores the nonlinear dynamics of higher order parallel Buck-Boost Converter.Thirdly in this paper uses parametric resonance perturbation method and slope compensation method for higher order parallel Buck-Boost converter respectively. By theoretical analysis and numerical simulation of the principles of the two control methods are analyzed, On the one hand the experimental results confirm the effectiveness of the two control methods, On the other hand obtained by comparing their respective advantages and limitations. It illustrates the practical application scenarios should be flexible selection control method according to specific requirements.Finally, By building physical experimental platform, from a practical point of view to verify the Buck-Boost Converter and higher order parallel Buck-Boost Converter complex and diverse behavior of nonlinear dynamics, confirming the parameter perturbation method and the slope compensation method can control the chaotic state of the system to a different cycle tracks. Results of this study have important guiding significance to the Buck-Boost Converter and its higher order parallel converter system parameter optimization and stability analysis.