Model predictive single-phase-shift control method for double-active full-bridge DC-DC converter

Abstract

The invention discloses a model predictive single-phase-shift control method for a double-active full-bridge DC-DC converter, including the following steps: constructing a state differential equationof the output voltage of the double-active full-bridge DC-DC converter according to a state space average model of the output voltage of the converter; discretizing the differential item of the outputvoltage in the differential equation, and calculating the predicted output voltage of the converter in the next control period; constructing a target evaluation function J according to the differencebetween the predicted output voltage of the converter and a reference output voltage; and taking the derivative of the target evaluation function J to obtain the optimized phase shift D(opt) of the double-active full-bridge DC-DC converter under predictive control. The problem that a converter is slow in dynamic response in case of sudden change of the load resistance, the input voltage and the reference voltage under the existing control algorithm is solved. The control algorithm has the advantages of simple structure, easy digitization and good fault tolerance, and thus, has strong practicability.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a model-predicted single-phase-shift control method for dual-active full-bridge DC-DC converters. Background technique [0002] Traditional industrial frequency transformers have outstanding advantages such as high efficiency, strong reliability and low price, but the environmental problems caused by insulating oil, large volume and quality, and difficult maintenance are also becoming more and more prominent. With the development of semiconductor technology and the improvement of control theory, coupled with the demand for environmental protection and energy saving, power electronic transformers have gradually become the development trend of the future power system to replace traditional power frequency transformers. [0003] In addition to the functions of electrical isolation and voltage conversion, power electronic transformers also have many functions such as small ...

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Problems solved by technology

[0005] In view of the above problems, the object of the present invention is to provide a model predictive single-phase shift control method for dual active full-bridge DC-DC converters, to solve the problems of existing control methods for load, reference voltage and input voltage mutations, etc. The problem that fast dynamic response cannot be achieved under extreme conditions

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