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Fixed time sliding mode control method of step-down DC/DC convert

A DC converter, fixed-time technology, applied in the direction of converting DC power input to DC power output, adaptive control, general control system, etc., can solve the problem of slow system convergence, and achieve the effect of eliminating the impact

Active Publication Date: 2019-01-18
ZHEJIANG UNIV OF TECH
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Problems solved by technology

[0005] In order to solve the problem that the upper bound of the convergence time of the output voltage control method of the existing step-down DC converter is related to the initial value of the system state variable, and the system convergence speed is relatively slow, the present invention proposes a fixed-time sliding method for the step-down DC converter. Modular control method, this method designs a fixed-time sliding mode controller to ensure that the system can be stable within a fixed time, and realize that the output voltage converges to the reference expected output voltage within a fixed time, and the upper bound of the convergence time has nothing to do with the initial value of the system state variable , eliminating the influence of the initial value of the system state variable on the upper bound of the system convergence time

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  • Fixed time sliding mode control method of step-down DC/DC convert

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Embodiment Construction

[0041] The present invention will be further described below in conjunction with the accompanying drawings.

[0042] refer to Figure 1-Figure 5 , a step-down DC converter fixed-time sliding mode control method, the control method comprising the following steps:

[0043] Step 1, establish a step-down DC converter system model, initialize the system state and control parameters, the process is as follows:

[0044] 1.1, the average model of the step-down DC converter system is expressed in the following form

[0045]

[0046] 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; u is the control input;

[0047] 1.2, define the state variable x 1 =V o -V ref , Then the buck DC converter error dynamic equation can be written as the following state space form

[0048]

[0049] Among them, V ref is the desired reference output voltage, V ref i...

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Abstract

A fixed time sliding mode control method of step-down DC / DC converta comprises the following steps: (1) establishING a system model of the buck DC converter, initializing a system state and control parameters; Step 2, based on the fixed-time sliding mode control theory, designing the fixed-time sliding mode controller, and designing the Lyapunov function. The invention realizes that the system output voltage converges to the desired reference output voltage in a fixed time, and the upper bound of the convergence time is independent of the initial value of the system state variable.

Description

technical field [0001] The invention relates to a fixed-time sliding mode control method of a step-down DC converter, in particular to a fixed-time sliding mode control method of a step-down DC converter with system external disturbance. Background technique [0002] A DC converter is a power electronic device that performs voltage conversion in a DC circuit and is widely used in many applications, including DC motor drives, communication equipment, and power supplies for personal computers. Basic topologies are divided into step-down DC converters, step-up Step-down converters, buck-boost converters. Among them, step-down DC converters, also known as step-down converters, are widely used because of their step-down characteristics, simple structure, high stability, and easy analysis. [0003] Since the current mainstream PID control is sensitive to parameter changes, it cannot meet the increasing performance requirements of power converters. In recent years, more and more ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/00G05B13/04
CPCG05B13/042H02M3/00
Inventor 陈强钱宁南余荣
Owner ZHEJIANG UNIV OF TECH