Novel double-loop control method for dual-active bridge DC/DC converter based on double phase-shift control

A dual-active bridge and double-loop control technology, applied in control/regulation systems, DC power input conversion to DC power output, instruments, etc., can solve problems that are not general, loss modeling research, and small signal modeling that has not been seen. Technology research and other issues to achieve the effect of improving dynamic response, realizing real-time control, and simplifying controller design

Active Publication Date: 2017-06-13
NANJING NARI GROUP CORP +2
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Problems solved by technology

[0004] 1) Small signal modeling of DAB under single phase shift control; no research on small signal modeling technology under double phase shift control
[0005] 2) Loss modeling of DAB under extended phase-shift control; this control method is a special case of double-phase-shift control method and is not general
[0006] 3) Loss modeling of DAB under dual phase shift control, but no research on loss modeling covering the full phase shift range

Method used

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  • Novel double-loop control method for dual-active bridge DC/DC converter based on double phase-shift control
  • Novel double-loop control method for dual-active bridge DC/DC converter based on double phase-shift control
  • Novel double-loop control method for dual-active bridge DC/DC converter based on double phase-shift control

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Embodiment Construction

[0045] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0046] A novel dual-loop control method for a dual-phase-shift control dual-active-bridge DC / DC converter, comprising the following steps:

[0047] Step 1. In the dual phase shift control mode, according to the value range of the inner and outer phase shift angles, divide the DAB into several working modes, analyze each working mode, and divide the different working modes in one switching cycle. The working status of DAB is divided into several working sub-stages.

[0048] DAB dual phase shift control includes two phase shift angles: the inner phase shift angle is the phase shift angle between the trigger pulses of the switching tubes on the same H bridge diagonal, for example figure 1 Shown: ...

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Abstract

The invention discloses a novel double-loop control method for a dual-active bridge DC/DC converter based on double phase-shift control. Under a double phase-shift control mode, a transfer function from the internal and external phase-shift angles to output voltage in different operating modes are obtained by using a small signal modeling technique in order to guide the inner-loop design of the dual-active bridge DC/DC converter. By establishing a relation between a loss model and peak current in different operating modes, the internal and external phase-shift angles in different operating modes during the optimal peak current are obtained so as to guide the outer-loop design of the dual-active bridge DC/DC converter. The use of a double-loop control compensation system can increase the cutoff frequency of the system, can greatly improve the dynamic response of the system, can reduce the static error of the system, and can realize the fast response speed and precision. The control method of replacing the optical loss with the optical peak current can simplify controller design and realize the real-time control of the converter.

Description

technical field [0001] The invention relates to a novel double-loop control method for a dual-phase-shift control dual-active-bridge DC / DC converter, which belongs to the technical field of power electronics. Background technique [0002] The power electronic transformer (PET) includes AC-DC, DC-DC and DC-AC three-stage power electronic conversion parts, and the intermediate DC-DC stage is the key link for PET to realize energy conversion. Dual active bridge DC / DC converter (DAB) usually refers to a bidirectional DC-DC converter with an isolation transformer. With its inherent soft switching characteristics, bidirectional energy flow, high power density and energy controllable advantages, it is in PET Its application has also received more and more attention. [0003] At present, the research on the DAB controller mainly focuses on: the suppression of reactive power, the reduction of peak value and effective value current, and the realization range of soft switching. For th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/3353H02M1/0058Y02B70/10
Inventor 张辉吕宏水侯凯骆健王志刚董长城何安然范镇淇申方胡博张涛
Owner NANJING NARI GROUP CORP
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