An active disturbance rejection control method for a Cuk converter

Abstract

The invention provides an active disturbance rejection control method of a Cuk converter, belonging to the technical field of electronic control. The invention solves the problems that the input voltage disturbance, the parasitic parameter disturbance and the load disturbance of the Cuk converter in the prior art have serious influence on the output voltage. The method comprises the following steps: a, establishing a mathematical model of a Cuk converter according to a Cuk circuit; B, designing a second-order differential equation to determine a tracking differentiator, and extracting an original signal and a derivative signal of an input reference voltage in a mathematical model of the Cuk converter through the tracking differentiator; C, establishing an extended state observer accordingto the second-order nonlinear system to estimate the total disturbance of the system; D, determining the nonlinear state error feedback control law by nonlinear combination of the error signal, its derivative signal and its integral signal, and the control quantity of the system is composed of the nonlinear combination and the total disturbance. This control method can make the output voltage giveyou better robustness, adaptability and stability.

Description

technical field [0001] The invention belongs to the technical field of electronic control, in particular to an active disturbance rejection control method of a Cuk converter. Background technique [0002] The Cuk converter can both step up and step down, and has excellent characteristics and good steady-state performance, so it is widely used in power electronic equipment as a switching power supply module. With the development and progress of science and technology, people have higher and higher requirements for the performance of switching power supplies. In the working process of power electronic converters, in order to improve the stability of the system, it is very important to choose an appropriate control method. [0003] The traditional PID method is applied to the control of the Cuk converter. Due to the nonlinear relationship between the output voltage of the converter and the duty cycle and the nonlinearity caused by switching, input voltage fluctuations, load dis...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the above-mentioned problems in the existing technology, and proposes an active disturbance rejection control method of a Cuk converter, to overcome the input voltage disturbance, parasitic parameter disturbance, and load disturbance in the Cuk converter in the prior art. problems that seriously affect the output voltage

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