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Method for dual-phase-shift control with bidirectional inner phase shifts for minimum reflux power of dual-active-bridge converter

A dual active bridge, phase-shift control technology, applied in the direction of DC power input conversion to DC power output, control/regulation system, output power conversion device, etc., can solve the problem of double active bridge converter return power reduction and other issues

Active Publication Date: 2018-10-09
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The purpose of the present invention is to further solve the problem of realizing the minimum return power operation when outputting different powers on the basis of the existing dual bidirectional internal phase-shift modulation method, so that the return power of the dual active bridge converter is greatly reduced, and In a certain power range, the theoretical value of the return power is zero

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  • Method for dual-phase-shift control with bidirectional inner phase shifts for minimum reflux power of dual-active-bridge converter
  • Method for dual-phase-shift control with bidirectional inner phase shifts for minimum reflux power of dual-active-bridge converter
  • Method for dual-phase-shift control with bidirectional inner phase shifts for minimum reflux power of dual-active-bridge converter

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Embodiment Construction

[0065] figure 1 It is a schematic diagram of the topology of the dual active bridge converter involved in the present invention. Depend on figure 1 It can be seen that the topology of the dual active bridge converter involved in this control method includes a DC voltage source, an input capacitor C i , a primary side H bridge, a phase shift inductor L, a high frequency transformer, a secondary side H bridge, an output capacitor C o and a load resistor R.

[0066] The primary side H-bridge is composed of four switching tubes IGBT, four anti-parallel diodes and four parasitic capacitors, and the four switching tubes IGBT are respectively denoted as switching tubes IGBTs 1 , switching tube IGBTS 2 , switching tube IGBTS 3, switching tube IGBTS 4 , the four antiparallel diodes are denoted as D 1 、D 2 、D 3 、D 4 , the four parasitic capacitances are denoted as C 1 、C 2 、C 3 、C 4 ; The secondary side H-bridge is composed of four switching tubes IGBT, four anti-parallel ...

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Abstract

The invention discloses a method for dual-phase-shift control with bidirectional inner phase shifts for a minimum reflux power of a dual-active-bridge converter. Under a condition of constant power transmission, compared with dual-phase-shift modulation, the dual-phase-shift modulation with the bidirectional inner phase shifts has an advantage of inhibiting the influence of the disturbance of an outer phase-shift duty ratio on an inner phase-shift duty ratio, so that a control system is more stable, and the transmission power is more stable. The invention provides a minimum reflux power control method based on the dual-phase-shift modulation with the bidirectional inner phase shifts. According to the method, an optimal operation point of the backflow power can be found through automatic adjustment when different powers are output, so that the backflow power is greatly reduced, and the efficiency of the converter is effectively improved. Therefore, for the dual-phase-shift modulation, the method is more suitable for being applied to a system with the dual-active-bridge converter as an energy transmission unit, in particular to occasions with high requirements for control stability.The method is very wide in prospect and easy to popularize.

Description

technical field [0001] The invention belongs to the energy transmission technology of a bidirectional direct current converter in the field of electrical engineering, and in particular relates to a dual bidirectional internal phase shift control method for the minimum return power of a double active bridge converter. Background technique [0002] Dual Active Bridge (DAB) converters have the characteristics of bidirectional power flow, high power density, low cost, high reliability and high efficiency. It is increasingly used in high-power energy transmission. Common modulation methods include traditional phase shifting, extended phase shifting, double phase shifting, and triple phase shifting. For different modulation methods, there is a problem of backflow power in the process of energy transmission, that is, when the AC output voltage U of the primary side H bridge ab and inductor current i L When the direction is opposite, the energy stored in the inductor flows back t...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/3353
Inventor 张兴高帅赵文广郭华越王付胜
Owner HEFEI UNIV OF TECH
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