Continuous sliding mode zero current sensor control method of DC voltage reduction converter

A technology of DC step-down and control method, which is applied in the direction of converting DC power input to DC power output, control/regulation systems, instruments, etc. Voltage control accuracy and interference suppression capability, good application value, and the effect of suppressing parameter perturbation

Active Publication Date: 2017-08-25
SOUTHEAST UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, this method requires both voltage and current measurement information, which increases the cost of the system to a certain extent and cannot meet the high fault tolerance requirements of the system.

Method used

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  • Continuous sliding mode zero current sensor control method of DC voltage reduction converter
  • Continuous sliding mode zero current sensor control method of DC voltage reduction converter
  • Continuous sliding mode zero current sensor control method of DC voltage reduction converter

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Embodiment Construction

[0045] 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.

[0046] A continuous sliding mode current sensorless control method for a DC step-down converter, the specific steps are as follows:

[0047] Step 1. Establish the state space model of the DC step-down converter, taking the inductor current and capacitor voltage of the converter system as the state quantities respectively, adopting time averaging technology, and considering the influence of factors such as system parameter perturbation, input voltage fluctuation and load mutation , to establish the state-space average model of the buck converter;

[0048] Step 2, for the DC buck converter system model, design a finite-time observer to estimate the lumped disturbance caus...

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Abstract

The invention discloses a continuous sliding mode zero current sensor control method of a DC voltage reduction converter. The method is based on a voltage reduction average state model, the continuous sliding mode control theory and a limited time observer are utilized to design a composite continuous controller, a reference input voltage can be precisely tracked by the voltage reduction converter even under the condition of having no current sensor, system hardware cost is reduced, system fault tolerance is improved, moreover, interference of a converter system caused by parameter perturbation, input voltage fluctuation and load abrupt change can be further estimated through the limited time observer, and anti-interference capability of the system is improved. The reference voltage can be precisely tracked by the designed zero current sensor composite controller even when the DC voltage reduction converter is under the conditions of parameter perturbation, input voltage fluctuation and load abrupt change. The method is advantaged in that a sliding mode shivering phenomenon can be eliminated through the proposed composite controller, and a closed loop system is made to have an excellent response speed and anti-interference capability.

Description

technical field [0001] The invention relates to a continuous sliding mode no-current sensor control method of a DC step-down converter, in particular to a no-current sensor control method of a DC step-down converter based on continuous sliding mode control and a finite time observer, belonging to power electronic conversion device technology field. Background technique [0002] In recent years, with the rapid development of smart grid and distributed new energy, the DC buck converter system has been widely used in various DC voltage regulation systems. Its applications include: high-voltage DC power transmission and distribution systems, DC motors Drive system, solar photovoltaic power generation system, industrial automation system and military aerospace and other fields. As the most common and basic power conversion device, the output voltage response speed, anti-interference ability and tracking accuracy of the DC step-down converter all play a vital role in the electric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/157
CPCH02M3/157
Inventor 李世华王佐杨俊张璐戴忱李奇
Owner SOUTHEAST UNIV
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