Control system for BUCK converter based on control target correction and optimization method

Abstract

The invention provides a control system for a BUCK converter based on control target correction and an optimization method. The deviation between a voltage sample value output by the BUCK converter and a voltage set value is adjusted by a PI regulator to obtain corrected deviation; the voltage set value is corrected according to the corrected deviation to obtain a corrected converter voltage set value; the corrected voltage set value is substituted into a converter optimization control objective function based on a simplified model to obtain a corrected converter optimization control value; and the corrected optimization control value is applied to the BUCK converter to perform optimization. According to the method, optimization design based on the model is combined with traditional design, so that the optimization problem solving calculation amount is small, and online calculation of a control decision can be achieved; and compensation of a control error is achieved by dynamically correcting a control target according to the control strategy, and the applicability of the control strategy under various operation conditions of the converter is improved.

Description

technical field [0001] The invention relates to the technical field of converters, in particular to an optimal control system and method for a DC-DC converter. Background technique [0002] DC-DC power converters are widely used in various industrial fields and have wide operating conditions. Since the converter is a hybrid system with rich linear and nonlinear phenomena, the control of DC-DC converters has always been studied by researchers. Pay attention, especially to the regulation of the output voltage under various operating conditions (load disturbance or input disturbance). [0003] With the improvement of the computing power of the control chip and the development of hybrid system control technology, some advanced nonlinear control ideas have injected new vitality into the control of DC-DC switching converters. At present, some nonlinear control strategies have been introduced into the converter control, such as fuzzy control, optimal control, etc., but these advan...

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Problems solved by technology

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a control system and optimization method based on control target correction of the BUCK converter, which solves the problems in the prior art that the optimization control design based on the model has a large amount of calculation and cannot be performed in high-frequency applications. On-line optimization; the control strategy can only set a single expected value for the output voltage of the converter, which is not conducive to meeting the requirements of rapid dynamic adjustment under various operating conditions

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