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

Abstract

The invention discloses a DC buck converter system control method based on an extended state observer and a continuous nonsingular terminal sliding mode control technology. The method is suitable forthe high-precision control of a direct-current buck converter system, and comprises the steps of adopting a voltage tracking mode, firstly, designing the extended state observer for input voltage change and resistance load disturbance to observe disturbance; on the basis, designing a continuous nonsingular terminal sliding mode controller so as to obtain a composite controller to control the direct-current buck converter system to rapidly track the target voltage with high precision under the conditions of input voltage change and load resistance disturbance. The method provided by the invention is simple to implement and is less in parameter adjustment, not only can improve the purpose of rapidly tracking the reference signal by the direct-current buck converter system, but also can effectively reduce the steady-state fluctuation of a power electronic direct-current buck converter, and meets the application of the high-performance power electronic buck converter system.

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 continuous non-singular terminal 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] In the actual DC power supply equipment, most of the DC converter systems require high output volt...

AI Technical Summary

Problems solved by technology

[0003] 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 quickly and actively deal with these disturbances, it is difficult for the closed-loop system to achieve fast and high-precision voltage output performance

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