DC buck converter system control method based on extended state observer and sliding mode control technology

Abstract

The invention discloses a DC buck converter system control method based on an extended state observer and a sliding mode control technology, which is applicable to high-precision control on the DC buck converter system. The method adopts a voltage tracking mode, an extended state observer is firstly designed to observe disturbances for voltage changes and resistance load disturbances, and on the basis, a sliding mode controller is designed to thus obtain a composite controller to control the DC buck converter system to quickly and high precisely track target voltage in a condition with input voltage changes and load resistance disturbances. The method is simple to realize, parameters are little adjusted, the purpose of enabling the DC buck converter system to quickly track reference signals can be achieved, steady state disturbances of a power electronic DC buck converter can be effectively reduced, and application of the high-performance power electronic buck converter system can be met.

Description

technical field [0001] The invention relates to a power electronic DC step-down converter system, in particular to a control method for a DC step-down converter system based on an extended state observer and sliding mode control technology. Background technique [0002] With the rapid development of modern science and technology, especially the great progress of power electronics technology, microelectronics technology, digital control technology and modern control theory, favorable conditions have been created for the development of power electronic DC switching power supply systems, especially in robotics, precision In areas such as radar, military weapons, and new energy photovoltaic systems, which require higher and higher control performance of DC switching power supplies, DC converter systems have received more and more attention. [0003] At present, the DC step-down power electronic converter system mostly adopts a double closed-loop control structure, that is, the i...

AI Technical Summary

Problems solved by technology

[0004] In the actual DC power supply equipment, most of the DC converter systems require high output voltage accuracy and the ability to quickly adapt to various working conditions. In some cases, for example, in the case of disturbances, integration is mainly used to eliminate the influence of disturbances on the output voltage, which is a passive and slow control method, especially when the system encounters fast time-varying or periodic It is difficult to quickly track the given voltage during disturbances, which mainly include load fluctuations, voltage input changes, etc.

If the controller does not deal with these disturbances quickly and actively, it is difficult for the closed-loop system to achieve fast and high-precision voltage output performance

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