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Transient control method for power commutation of dual-active full-bridge direct-current converter

A technology of a DC converter and a control method, which is applied in the direction of converting DC power input into DC power output, output power conversion device, control/regulation system, etc., can solve problems such as transient DC bias, transient hard switching, etc.

Inactive Publication Date: 2021-01-08
SHENZHEN UNIV
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Problems solved by technology

[0005] In view of this, the transient control method for power commutation of dual active full-bridge DC converters proposed by the present invention aims to solve the transient DC bias and transient state when dual active full-bridge DC converters perform bidirectional power transmission. hard switch problem

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  • Transient control method for power commutation of dual-active full-bridge direct-current converter
  • Transient control method for power commutation of dual-active full-bridge direct-current converter
  • Transient control method for power commutation of dual-active full-bridge direct-current converter

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Embodiment Construction

[0040]The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0041] It should be understood that when used in this specification and the appended claims, the terms "comprising" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude one or Presence or addition of multiple other features, integers, steps, operations, elements, components and / or collections thereof.

[0042] see figure 1 , is a schematic flowchart of a transient ...

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Abstract

The embodiment of the invention provides a transient control method for power commutation of a dual-active full-bridge direct-current converter. The method comprises the following steps: receiving target steady-state power and initial steady-state power input by a user, and if the power switching mode of a dual-active full-bridge direct-current converter is judged to be changed from forward transmission to reverse transmission, calculating the negative pulse width of a primary side square wave voltage vh1 in a transient state and the positive pulse width of a secondary side square wave voltagevh2 in the transient state through a formula according to the target steady-state power and the initial steady-state power; and if it is judged that the power switching mode of the dual-active full-bridge direct-current converter is converted from reverse transmission to forward transmission, similarly obtaining the negative pulse width of the primary side square wave voltage vh1 in the transientstate and the positive pulse width of the secondary side square wave voltage vh2 in the transient state so as to improve the transient performance of the dual-active full-bridge direct-current converter in power commutation. According to the method, transient direct-current bias generated when the dual-active full-bridge direct-current converter carries out power transmission switching is eliminated, transient soft switching is achieved, and the risk that components are damaged is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of power converters, in particular to a transient control method for power commutation of dual active full-bridge DC converters. Background technique [0002] With the rapid development of renewable energy and smart grid technology, the need for frequent power exchange between different energy sources is becoming more and more common in order to achieve flexible power management. Bidirectional power converters play a role in those applications that require bidirectional power transmission. Play an important role, such as: battery energy storage systems, uninterruptible power supplies, electric vehicles, solid-state transformers. Dual active full-bridge DC converter is the most typical circuit topology in bidirectional power converters. It has the advantages of high power density, electrical isolation, soft switching, bidirectional power transmission, modularization, and symmetrical structure, so it has attra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/08H02M1/088
CPCH02M1/083H02M1/088H02M3/33584H02M1/0038Y02B70/10
Inventor 尹健鲁健
Owner SHENZHEN UNIV
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