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Direct current buck converter system control method based on composite integral sliding mode control

A technology of DC step-down and integral sliding mode, which is applied in the direction of control/regulation system, DC power input conversion to DC power output, output power conversion device, etc. It can solve the problem that the expansion state observer cannot achieve limited time convergence and influence Problems such as actual system performance and mismatch interference can be achieved to improve dynamic response speed and anti-interference ability, improve steady-state accuracy and anti-interference ability, and improve dynamic response speed

Active Publication Date: 2021-08-20
SOUTHEAST UNIV
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Problems solved by technology

However, this method is relatively complicated, and requires the system interference to be bounded and derivable, which affects the actual performance of the system to a certain extent.
Literature (Extended State Observer-based Sliding Mode Control for PWM-based DC–DCBuck Power Converter Systems With Mismatched Disturbances.IET Control Theory and Applications.9(4):579-586.2015.) solved the mismatch by designing an extended state observer The problem of interference, but the extended state observer cannot achieve finite time convergence

Method used

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  • Direct current buck converter system control method based on composite integral sliding mode control
  • Direct current buck converter system control method based on composite integral sliding mode control
  • Direct current buck converter system control method based on composite integral sliding mode control

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Embodiment Construction

[0043] Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0044] A control method for a DC step-down converter system based on compound integral sliding mode control, the specific steps are as follows:

[0045] Step 1, take the capacitance voltage v of the DC step-down converter as s , inductor current i L is the state quantity, the state space average model of the disturbed DC buck converter is gradually established by using the state space average method.

[0046] In step 2, a finite-time disturbance observer is designed for the disturbed state-space average model of the converter obtained in step 1 to accurately estimate the disturbance caused by load changes and input voltage fluctuations. Since the load interference has...

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Abstract

The invention discloses a direct current buck converter system control method based on composite integral sliding mode control. According to the method, load interference and voltage interference of a converter system are accurately estimated by establishing a state space averaging model of the buck converter and utilizing a finite time interference observation technology, and interference estimation information is introduced into the design of an integral sliding mode controller so that the output voltage of the buck converter system is accurately controlled. According to the designed composite integral sliding mode controller, the output voltage of the buck converter can be converged within finite time, interference of various forms can be restrained, and the dynamic response speed and the steady-state precision of a buck converter system are effectively improved.

Description

technical field [0001] The invention relates to a compound integral sliding mode control method for a DC step-down converter system, in particular to a compound control method for a DC step-down converter system based on finite-time disturbance observer technology and integral sliding mode control technology, which belongs to power electronic converters The field of advanced control algorithms. Background technique [0002] The DC buck converter is a converter with a step-down function in the DC / DC converter. With the application and development of various distributed new energy technologies, DC step-down converters are widely used in various fields such as photovoltaic power generation systems, electric vehicle systems, new energy systems, and smart grids. Various application scenarios put forward higher requirements on the output voltage response speed, steady-state accuracy, and anti-interference ability of the DC buck converter. [0003] The traditional PID control met...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156H02M1/08
CPCH02M3/156H02M1/08
Inventor 王佐张传凯李世华王翔宇
Owner SOUTHEAST UNIV
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