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Fixed-time sliding mode control method for step-down DC converter based on parameter self-adaptation

A DC converter, fixed time technology, applied in adaptive control, conversion of DC power input to DC power output, general control system, etc., can solve problems such as affecting the convergence speed of the system

Active Publication Date: 2021-08-03
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0004] The traditional finite-time sliding mode control can guarantee the stability of the system in a finite time, but because the upper bound of the convergence time is related to the initial value of the system state variable, that is, when the initial value of the system state variable changes, the upper bound of the convergence time of the system will also change, and Affect the convergence speed of the system

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  • Fixed-time sliding mode control method for step-down DC converter based on parameter self-adaptation
  • Fixed-time sliding mode control method for step-down DC converter based on parameter self-adaptation
  • Fixed-time sliding mode control method for step-down DC converter based on parameter self-adaptation

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Embodiment Construction

[0051] The present invention will be further described below in conjunction with the accompanying drawings.

[0052] refer to Figure 1-Figure 7 , a fixed-time sliding mode control method for a step-down DC converter based on parameter self-adaptation, comprising the following steps:

[0053] Step 1, establish a step-down DC converter system model, initialize the system state and control parameters, the process is as follows:

[0054] 1.1, the average model of the step-down DC converter system is expressed in the following form

[0055]

[0056] Among them, V o is the output voltage, V in is the input voltage, i C is the output capacitor current, L, C, R are the inductance, capacitance and load resistance respectively, and u is the control input;

[0057] 1.2, define the state variable x 1 =V o -Vref ' Then the buck DC converter error dynamic equation is written in the following state space form

[0058]

[0059] Among them, V ref is the desired reference outp...

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Abstract

A method for constant-time sliding mode control of a step-down DC converter based on parameter self-adaptation, comprising the following steps: Step 1, establishing a system model of a step-down DC converter, initializing the system state and control parameters; Step 2, designing Fixed time sliding mode surface; step 3, based on the fixed time sliding mode control method and adaptive control theory, design parameter adaptive fixed time sliding mode controller. The invention realizes that the output voltage converges to the neighborhood containing the expected reference output voltage within a fixed time when the system parameters are unknown, and the upper bound of the convergence time has nothing to do with the initial value of the system state variable.

Description

technical field [0001] The invention relates to a constant-time sliding mode control method for a step-down DC converter based on parameter self-adaptation, in particular to a fixed-time sliding mode control method for a step-down DC converter with uncertain system parameters. Background technique [0002] A DC converter is a power electronic device that converts voltage from a DC circuit and is widely used in many applications, including DC motor drives, communications equipment, and power supplies for computers. The basic topology is divided into buck converter, boost converter, and buck-boost converter. Among them, the buck converter is widely used because of its buck characteristics, simple structure, high stability, and easy analysis. [0003] Since the commonly used PID control is sensitive to parameter changes, it cannot meet the increasing performance requirements of power converters. In recent years, more and more new nonlinear control techniques have been applied ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04H02M3/156
CPCG05B13/042H02M3/156
Inventor 陈强钱宁南余荣
Owner ZHEJIANG UNIV OF TECH
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