Research on Two-Switch Bridge Buck-Boost Converter Based on Active Disturbance Rejection Control

Power electronic converters, especially buck-boost circuits, play a vital role in energy management, electric vehicles, renewable energy systems and other fields. Due to the traditional PID control, there are some problems such as complex parameter setting, accurate mathematical model, sensitivity to external interference and limited response speed. In this paper, the second-order active disturbance rejection control is used as the basic control structure of the main circuit, which solves the problems of slow dynamic response speed, complex parameter setting and high accuracy of model requirements of PID control. At the same time, the selection of the main circuit structure also has the function of realizing wide input, which can be applied to many occasions. Finally, by analyzing and comparing the output voltage waveforms under the active disturbance rejection control strategy and the double closed-loop proportional integral control applied in different working conditions, the robustness and effectiveness of the active disturbance rejection control strategy applied in this paper are verified.