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Dual-active-bridge resonant convert modeling, ord reduction, design method, device and system

A technology of dual active bridges and modeling methods, applied to devices and systems, modeling of resonant dual active bridge converters, order reduction, isolated bidirectional DC-DC converters, design methods, resonant dual active bridges In the field of bridge converters, it can solve problems such as optimal design of unfavorable magnetic components and improvement of power density

Active Publication Date: 2019-01-25
NARI TECH CO LTD +5
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the paper "Design Methodology of Bidirectional CLLC Resonant Converter for High-Frequency Isolation of DCDistribution Systems" published in the journal IEEE Transaction on Power Electronics in 2013, the output voltage of the resonant dual active bridge is controlled by frequency conversion control, but the frequency conversion control does not It is conducive to the optimized design of magnetic components and the improvement of power density, so it is less used in high-power occasions
In the article "Frequency Domain Analysis of Series Resonant Dual Active Bridge DC-DC Converter" published in the Journal of High Power Conversion Technology in 2017, the precision of the series resonant dual active bridge converter based on single phase shift control was derived. Steady-state model, based on which the power transfer characteristics and soft switching characteristics of the converter are obtained, but the controller modeling and design are not carried out

Method used

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  • Dual-active-bridge resonant convert modeling, ord reduction, design method, device and system
  • Dual-active-bridge resonant convert modeling, ord reduction, design method, device and system
  • Dual-active-bridge resonant convert modeling, ord reduction, design method, device and system

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Embodiment 1

[0085] In the embodiment of the present invention, a modeling method of a resonant dual active bridge converter is provided, which includes the following steps:

[0086] Step 1: Obtain the preset transmission power formula of the resonant dual active bridge converter;

[0087] In the embodiment of the invention, the preset transmission power formula of the resonant dual active bridge converter is the transmission power formula of the resonant dual active bridge converter ignoring loss, specifically:

[0088]

[0089] In the formula, δ is the shift ratio, and the value range is -1 <δ <1; k is the frequency ratio, Z is the characteristic impedance, the specific definition is shown in the following formula:

[0090]

[0091] Where f s Is the switching frequency, f r Is the resonance frequency;

[0092] Step 2: Based on the transmission power formula of the resonant dual active bridge converter, reduce the order of the resonant components in the resonant dual active bridge converter to obta...

Embodiment 2

[0114] Based on the same inventive concept as the embodiment 1, in the embodiment of the present invention, a modeling device for a resonant dual active bridge converter is provided, including:

[0115] The transmission power formula obtaining module of the resonant dual active bridge converter is used to obtain the preset transmission power formula of the resonant dual active bridge converter;

[0116] The calculation module of the average value of the currents on both sides of the resonant dual active bridge converter when the power flows in both directions is used to calculate the resonant dual active bridge converter based on the transmission power formula of the resonant dual active bridge converter The average value model of the current on both sides when the power of the converter flows in both directions;

[0117] The average value equivalent model calculation module of the resonant dual active bridge converter is used to obtain the preset average value equivalent circuit mod...

Embodiment 3

[0122] Based on the same inventive concept as Embodiment 1, a model reduced order system of a resonant dual active bridge converter includes:

[0123] A processor suitable for implementing instructions; and

[0124] The storage device is adapted to store multiple instructions, and the instructions are adapted to be loaded by a processor and execute any step in the first embodiment.

[0125] The rest are the same as in Example 1.

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Abstract

The invention discloses a dual-active-bridge resonant convert modeling, ord reduction, design method, device and system. Under the condition of controlling the output voltage of resonant double activebridge converter by single phase-shifting control method, by using the transmission power formula of resonant double active bridge converter, the order of resonant elements in resonant double activebridge converter is reduced, and the average value equivalent model is established. Based on the average mode equivalence, the small signal model of the resonant double active bridge converter is established by using small signal method, and the transfer function is obtained according to the control quantity and the control object. the zero-pole distribution of the transfer function is analyzed and the order of the transfer function is reduced; Aiming at the reduced-order transfer function, the controller parameter design method is used to design the typical type II system. The invention has the advantages of simple principle and clear organization, provides the theoretical basis for the analysis of the resonant double active bridge converter, reduces the difficulty of analysis and design,and is easy to adopt the traditional control system parameter design scheme to design the controller.

Description

Technical field [0001] The invention belongs to the field of power electronics technology, relates to isolated bidirectional DC-DC converter technology, and specifically relates to a resonant dual active bridge converter modeling, order reduction, design method, device and system, and in particular to a resonant dual active bridge converter. Source bridge converter. Background technique [0002] High-power isolated two-way DC-DC converters can realize the functions of DC transformation, two-way energy transmission and electrical isolation. They have been used in electric vehicles, renewable energy, DC distribution systems, uninterruptible power supply systems, and power electronic transformers. Wide range of applications. Among many isolated bidirectional DC-DC converter topologies, dual active bridges have been widely studied and applied because of their symmetrical structure, flexible control, and easy realization of zero voltage turn-on. In order to further reduce the switch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/367
Inventor 姜云龙郑玉平王小红王志刚侯凯刘竞
Owner NARI TECH CO LTD
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