Buck converter compensation control method based on disturbance observer and second-order sliding mode

Abstract

The invention discloses a Buck converter compensation control method based on a disturbance observer and a second-order sliding mode, belongs to the field of electric and electronic converters, and in the conditions of external disturbance and uncertain system, the robustness of a Buck converter can be enhanced. The method mainly includes steps: 1, establishing a state space average model including disturbance according to a work principle of the Buck converter; 2, selecting an appropriate sliding variable, and establishing a second-order sliding mode kinetic equation; 3, designing a non-matching disturbance in a disturbance observer estimation system; and 4, designing a second-order sliding mode controller to ensure that the output voltage can rapidly and stably track the reference voltage. The method is advantageous in that firstly, the influence of the non-matching disturbance is considered, the sliding variable is a voltage error, the robustness of the Buck converter is improved, and the convergence of the voltage error is improved; and secondly, the disturbance observer is introduced so that the system has better anti-disturbance performance, good robustness is obtained, and the problem of buffeting is effectively alleviated.

Description

technical field [0001] The invention relates to the control technology of a Buck converter system, specifically uses the disturbance observation technology to design a second-order sliding mode control algorithm for disturbance compensation, the purpose is to improve the performance index of the output voltage of the Buck converter, and belongs to the technical field of power electronics. Background technique [0002] Due to the rapid development of power electronics technology in recent decades, the integration of circuits requires electronic chips to be smaller and smaller, and general linear regulators cannot meet the requirements of miniaturization of electronic chips, let alone provide digital storage systems. keep time. Moreover, with the development of science and technology, there are more and more types of electronic components, and the requirements for their accuracy are also getting higher and higher. Correspondingly, nonlinear power converters also need to improv...

AI Technical Summary

Problems solved by technology

However, it is also because of the discontinuity of the sliding mode control that it brings serious chattering effects to the system

Excessive chattering in the dynamic system will have a great negative impact on the system, and even cause the system to collapse.

Images