A Non-Singular Terminal Sliding Mode Control of Buck-Boost Converters Based on Extended State Observer

This paper focuses on the impact of Buck-Boost converter on the output voltage due to uncertain factors such as output voltage reference changes, load mutations, and input voltage changes. A non-singular terminal sliding mode control method based on an extended state observer (ESO) is proposed. The voltage control loop adopts a non-singular terminal sliding mode control law with an improved sliding mode surface. At the same time, an extended state observer is designed to estimate the uncertainty of the Buck-Boost converter and feed it back to the sliding mode control law, which reduces system chattering and improves system robustness. The simulation results show that the control method proposed in this paper can effectively improve the robustness and response speed of the Buck-Boost converter system.