Study On Active Disturbance Rejection Control Of Bidirectional DC-DC Converter

In the photovoltaic energy storage system,because the solar energy is easily affected by the weather and the environment,it is necessary to connect the energy storage device,the energy transfer between the energy storage device and the DC bus will be realized by the bidirectional DC-DC converter.Therefore,it is of great value and significance to study the control method of the bidirectional DC-DC converter.This paper studies the control method of the bidirectional DC-DC converter based on the active disturbance rejection control of the photovoltaic energy storage system.It solves the problem of the DC bus voltage instability caused by the fluctuation of the photovoltaic output and the uncertainty of the load,and improves the dynamic and static performance and the anti-disturbance ability of the photov oltaic energy storage system.Firstly,this paper introduces the research status of the bidirectional DC-DC converter topology and control methods,and analyzes the development process and application status of auto disturbance rejection control.Secondly,combined with the working principle and PWM control mode of the bidirectional DC-DC converter,the mathematical model of the bidirectional DC-DC converter is established for Buck mode and Boost mode respectively.Again,the structure and working principle of the active disturbance rejection controller are introduced,and on the basis of two modes of the bidirectional DC-DC converter,active disturbance rejection controller for the current inner loop is designed.On the basis of these,the control performance of the active disturbance rejection controller is discussed,and the parameter tuning is carried out by using the immune algorithm.Then,the system circuit model is built in the MATLAB/simulink simulation software,and the control effect of active disturbance rejection controller and the actuve disturbance rejection controller using immune algorithm is compared.The superiority of the active disturbance rejection controller using immune algorithm is verified.Finally,the system experimental platform based on Infineon XE164FN is built,the corresponding software program is written,and the experimental verification of various working conditions is carried out.The experimental results also prove the correctness and effectiveness of the above control method.It is also verified by contrast that the active disturbance rejection controller using immune algorithm can effectively improve the rapidity and anti-interference ability of the system.