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Control method for minimum current stress of double active bridge DC-DC converter on basis of consideration for dead zone effect

A technology of current stress and dual active bridges, applied in the direction of DC power input conversion to DC power output, control/regulation system, output power conversion device, etc., can solve the problem of DAB system optimization control without considering the dead zone effect, etc. To achieve the effect of enhancing reliability

Active Publication Date: 2017-05-24
SHANDONG UNIV
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Problems solved by technology

[0004] In order to solve the problem that the optimization control of the DAB system in the prior art does not consider the influence of the dead zone effect, the present invention proposes a dual active bridge DC-DC converter minimum current stress control method considering the dead zone effect, Based on the DPS control strategy, the present invention takes the voltage matching situation as a representative, analyzes the operation mode of DAB in detail, obtains the switching characteristics in each mode, and establishes the output power model of each mode

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  • Control method for minimum current stress of double active bridge DC-DC converter on basis of consideration for dead zone effect
  • Control method for minimum current stress of double active bridge DC-DC converter on basis of consideration for dead zone effect
  • Control method for minimum current stress of double active bridge DC-DC converter on basis of consideration for dead zone effect

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[0047] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0048] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0049]It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combination...

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Abstract

The invention discloses a control method for minimum current stress of a double active bridge DC-DC converter on the basis of consideration for a dead zone effect. The method comprises the following steps: constructing first and secondary side voltage waveforms and a current waveform passing by an inductor according to the magnitude relation of a dead zone proportion, an inner phase shifting angle, an outer phase shifting angle and a current zero-crossing-point position; constructing a power model according to the acquired voltage and current waveforms; and utilizing a genetic algorithm to analyze the parameter selection under the minimum current stress according to the established output power model and current stress model, and acquiring a minimal current stress optimizing strategy. According to the invention, for a voltage matching mode, the dead zone effect of DAB under double phase shifting strategy is analyzed in details, and a system switching characteristic and an output power model on the basis of consideration for the dead zone effect are acquired; on the basis, the genetic algorithm is utilized to acquire an optimization scheme for the minimal current stress; and finally, an experiment is adopted for verifying the theory.

Description

technical field [0001] The invention relates to a method for controlling the minimum current stress of a dual active bridge DC-DC converter considering the dead zone effect. Background technique [0002] Due to the advantages of high power density, bidirectional power flow, symmetrical structure, and easy zero-voltage turn-on, DAB converters are widely used in distributed power generation systems, AC-DC hybrid microgrids, and other occasions. In order to realize the efficient operation of DAB, researchers have made great efforts in the control strategy. Based on the traditional single-phase-shift control (single-phase-shift, SPS), by increasing the phase-shift angle, the enhanced phase-shift is realized. Control (enhanced-phase-shift, EPS), dual-phase-shift control (dual-phase-shift, DPS) and triple-phase-shift control (triple-phase-shift, TPS). As the number of phase shift angles increases, the control flexibility of the system increases, which is convenient for optimizati...

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/335H02M1/0003
Inventor 陈阿莲宋超超陈杰杜春水张承慧
Owner SHANDONG UNIV
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