Research And Control Of Chaos In DC/DC Converter

As a classic nonlinear system,DC/DC converters are often accompanied by chaotic phenomena.When the system is running,various nonlinear behaviors such as chaos may appear,and these behaviors will affect the stable operation of the system and bring harm to the system.Therefore,the mathematical model of the converter is established,Then,the chaotic phenomenon of the model is analyzed,To explore the mechanism of chaos,Some control strategies are introduced to control the chaotic state of the system,It is an important research direction of DC/DC converter.Firstly,the development background and research significance of DC/DC converter are described,This paper introduces the definition and analysis method of chaos,and analyzes the research status of chaos phenomenon and its control.Then,the influence of numerical simulation method and state space averaging method on the DC/DC converter model is analyzed,The first and second-order discrete models are analyzed.Secondly,this article summarizes the calculation method of the state transition matrix,and establishes the second-order discrete model of the parallel PWM Buck converter.The periodic trajectory of the Buck converter is analyzed,and the input voltage is used as the bifurcation parameter to analyze the transition process of the converter to the chaotic system through bifurcation.A Simulink model was established to verify the experimental process.At the same time,based on the simulation experiment,the basic parameter data of the model is calculated,and an improved ATDFC method is proposed.The model is numerically analyzed by setting the delay time to obtain a stable feedback coefficient range for the system,combined with dual PI feedback The control completes the optimization of the control algorithm.Finally,the experimental results show that the improved control strategy can find the optimal feedback coefficient matching the delay time under the support of adaptive theory by adjusting the feedback control parameters.After joining the chaos control link,the system gradually enters the stable state of the specified period from the chaotic state through the transition state,thus indicating that the expected control effect has been achieved.