Boost type converter control method and system based on finite time convergence observer

Abstract

The invention discloses a Boost type converter control method and system based on a finite time convergence observer, and belongs to the technical field of power electronics and control thereof. The system comprises a finite time convergence observer module, a non-singular terminal sliding mode controller module and a PWM module, and the method comprises the following design steps: selecting an inductive current iL and an output voltage Vo as state variables of a system, and establishing a differential equation of a Boost converter about the inductive current iL and the output voltage Vo; designing a finite time convergence observer according to the differential equation, combining the finite time convergence observer with a traditional nonsingular terminal sliding mode control method, anddesigning a new nonsingular terminal controller; and simultaneously inputting the output control quantity of the new controller and the sawtooth wave into the PWM module to generate a PWM signal to drive and control a power device in the Boost converter. When the load resistance and the input voltage suddenly change, the output voltage can still converge to the reference voltage within limited time, and the dynamic, steady and anti-interference performance of the system is improved.

Description

technical field [0001] The invention relates to the technical field of power electronics and its control, and more specifically, to a control method and system for a Boost converter based on a finite-time convergence observer. Background technique [0002] The core of the DC-DC converter is the control algorithm. The main task of the control algorithm is to maintain the stability of the output voltage and offset the uncertainty of the system parameterization. Its quality directly determines the operation effect of the DC-DC converter. Traditional linear control strategies mainly include voltage control strategy, peak current control strategy and average current control strategy. Among them, the dynamic response of the voltage control strategy is slow, which leads to poor anti-interference performance when there is a disturbance such as load change; while the peak current control strategy (introducing the inductor current into the loop) has a faster response speed, but when t...

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Problems solved by technology

[0014] Aiming at the slow dynamic response, poor steady-state performance and poor anti-interference performance of the traditional sliding mode control method used in the existing Boost converters, a new method based on The Boost converter control method and system of the finite-time convergence observer; on the basis of the traditional non-singular terminal sliding mode control strategy, the present invention adopts the finite-time convergence observer module that can estimate the load and the input voltage in a finite time , when the load resistance and the input voltage change suddenly, the output voltage can still converge to the reference voltage within a limited time, thus improving the dynamic and steady-state performance of the system

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