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Large-signal modeling method for dual-active full-bridge converter under dual phase shift modulation

A full-bridge converter and double phase-shifting technology, which is applied in the direction of adjusting electrical variables, converting DC power input to DC power output, instruments, etc., can solve the problems that the converter cannot obtain the best performance and the space for optimization is limited.

Active Publication Date: 2019-12-03
HANGZHOU DIANZI UNIV +1
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Problems solved by technology

At present, the phase shift modulation method is the most widely used modulation method for dual active full bridge (DAB) converters. The single phase shift modulation method has only one control variable, and the optimization space is very limited, which cannot make the converter achieve the best performance.

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  • Large-signal modeling method for dual-active full-bridge converter under dual phase shift modulation
  • Large-signal modeling method for dual-active full-bridge converter under dual phase shift modulation
  • Large-signal modeling method for dual-active full-bridge converter under dual phase shift modulation

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Embodiment Construction

[0037] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention.

[0038] The equivalent circuit is an effective means to study the dynamic characteristics of the converter system, which can help the design of the controller and greatly reduce the amount of calculation for calculating the dynamic performance and stability of the converter. Embodiments of the present invention aim at dual-active full-bridge (DAB) converters employing dual phase-shift modulation. First, an accurate discrete iterative model of the converter is established, and then...

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Abstract

The invention discloses a large signal modeling method for a dual-active full-bridge converter under dual phase shift modulation. For a DAB converter for dual phase shift modulation, a precise discrete iterative model of the converter is established, then a state matrix and an input matrix of a large-signal equivalent circuit are obtained based on a state transfer function in a discrete domain byutilizing a Baker-Campbell-Hausdorff theorem, and a large-signal equivalent circuit model of the converter is constructed. According to the method, the defects of a traditional discrete iterative model are overcome, meanwhile, a mathematical model and a circuit model are unified, the coupling relation and the control-output transfer function of all variables of the system are visually reflected, and a new thought is provided for related research work such as control and stability analysis of the dual-active full-bridge (DAB) converter.

Description

technical field [0001] The invention relates to a large signal modeling method of a dual active full bridge (DAB) converter, in particular to a large signal modeling method of a dual active full bridge (DAB) converter under double phase shift modulation. Background technique [0002] Among the numerous DC / DC converter topologies, the Dual Active Full Bridge (DAB) DC / DC converter can meet various demands of the DC distribution network for solid-state transformers. At present, the phase shift modulation method is the most widely used modulation method for dual active full bridge (DAB) converters. The single phase shift modulation method has only one control variable, and the optimization space is very limited, which cannot make the converter achieve the best performance. . The dual phase-shift modulation method has two control variables, which can optimize the inductor current of the converter, reduce loss, reduce return power, increase the soft switching range, etc., and ach...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50H02M3/335
CPCH02M3/33584Y02B70/10
Inventor 杭丽君童安平胡进邵持何远彬沈磊曾平良李国文
Owner HANGZHOU DIANZI UNIV
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