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

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...

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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

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