A Control Method of Boost Power Converter Based on Second-Order Sliding Mode Algorithm

Abstract

The invention discloses a control method for a boost power converter based on a novel second-order sliding mode algorithm. Based on the nonlinear and variable structure characteristics of the boost power converter and the limitations of the traditional control method itself, a method for boost power converter is proposed. Novel second-order sliding-mode control scheme for power converters. The method of the present invention not only considers the position error in the state space, but also considers the motion information of the error state; secondly, the error state converges on the sliding surface according to the index, which accelerates the convergence speed of the system; the coefficient factor of the control method and the state The variables are correlated and the output can be tracked nicely. This control method can realize rapid adjustment of the output voltage. Compared with the traditional sliding mode and traditional PID methods, the second-order sliding mode control method in the present invention has the advantages of fast response speed, small ripple, strong anti-interference ability, and good robustness. advantage. At the same time, the chattering problem existing in the traditional first-order sliding mode can be reduced, thereby significantly improving the performance of the boost converter controller.

Description

technical field [0001] The invention relates to the field of power electronic converters, and specifically utilizes a novel second-order sliding mode control method to improve the dynamic performance and steady-state performance of the power converter, improve the robustness of the system, and further weaken the chattering problem existing in sliding mode control . Background technique [0002] Boost power converter is a DC-DC switching power supply with simple topology, few components and good working reliability. It is widely used in aerospace, energy, electric vehicle and medical industries. Traditionally, the basic control method is PI control, which is generally realized in two ways, (1) control and regulation are realized through an analog PI controller composed of resistors, capacitors, operational amplifiers, and analog control chips; (2) ) through digital chips (such as: STM32, DSP, FPGA, etc.) and writing PI program codes to realize control and regulation. But be...

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Problems solved by technology

[0003] For the sliding mode algorithm, in theory, the switching speed of the switching device needs to be infinitely fast, but in practice it cannot be achieved due to factors such as devices

Therefore, there will be chattering phenomenon in the process of sliding mode surface switching.

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