Boost power converter control method based on novel second-order sliding mode algorithm

Abstract

The invention discloses a boost power converter control method based on a novel second-order sliding mode algorithm. The novel second-order sliding mode control scheme for a boost power converter is provided based on the characteristics of nonlinearity and variable structure of the boost power converter and the limitation of a traditional control method. According to the method, not only is position error in a state space considered, but also the motion information of an error state is considered; the error state converges to a sliding mode surface according to an index, so that the convergence speed of the system is increased; and the coefficient factor of the control method is related to a state variable, so that output can be well tracked. According to the control method, output voltagecan be rapidly adjusted. Compared with a traditional sliding mode and a traditional PID method, the second-order sliding mode control method has the advantages of high response speed, small ripple waves, high anti-interference capacity, good robustness and the like. And meanwhile, a buffeting problem existing in a traditional first-order sliding mode can be reduced, so that the performance of a boost converter controller is remarkably improved.

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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