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Instantaneous current control method of three-phase active bridge type direct-current converter

A technology of DC converter and dual active bridge, which is applied in the direction of converting DC power input to DC power output, control/regulation systems, instruments, etc., and can solve problems such as three-phase inductive current imbalance and converter DC current oscillation

Active Publication Date: 2016-10-19
XI AN JIAOTONG UNIV
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Problems solved by technology

However, for the duty cycle plus phase-shift modulation strategy that introduces the duty cycle of two three-phase bridge circuits as the other two control variables, when the two duty cycle commands are changed, the three-phase inductor current will also appear Unbalanced phenomenon, which causes the DC current on both sides of the converter to oscillate

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  • Instantaneous current control method of three-phase active bridge type direct-current converter
  • Instantaneous current control method of three-phase active bridge type direct-current converter
  • Instantaneous current control method of three-phase active bridge type direct-current converter

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Embodiment Construction

[0040] The present invention will be further described in detail below in conjunction with specific embodiments, which are explanations of the present invention rather than limitations.

[0041] The topology of the three-phase dual active bridge DC converter is as follows: figure 1 shown. where, assuming the power is from V 1 Side flow to V 2 side, the V 1 is the input side DC voltage, V 2 is the output DC voltage. Considering the case of three-phase symmetry, L a , L b and L c are the three-phase leakage inductance or additional inductance of the transformer, and their inductance values ​​are L s ; a , R b and R c They are three-phase line resistances, and their inductance values ​​are R s i a i b and i c are the three-phase inductor currents of the transformer, respectively. The transformation ratio of the three-phase high-frequency transformer is N:1.

[0042] Table 1 shows a set of basic parameters for setting the three-phase dual active bridge DC converte...

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Abstract

The invention discloses an instantaneous current control method of a three-phase active bridge type direct-current converter. Under the situation that the three-phase active bridge type direct-current converter is in a steady state, the duty ratio instructions D1,1 and D2,1 of two three-phase bridge circuits on the V1 side and the V2 side are independently or simultaneously are changed into D1,2 and D2,2, three-phase inductive current of a transformer can be balanced only by flowing across a transition interval of 1 / 3 or 2 / 3 of a switching period by adopting two method for adjusting the duty ratio in the transition interval, the amplitude and time of direct current oscillations, caused by three-phase inductive current unbalance, on two sides of the converter are greatly reduced, and accordingly the dynamic properties of the converter are improved.

Description

Technical field: [0001] The invention belongs to the technical field of three-phase dual-active bridge-type DC converters, and in particular relates to an instantaneous current control method of a three-phase dual-active bridge-type DC converter. Background technique: [0002] The existing three-phase dual active bridge DC converter consists of a three-phase high-frequency transformer and two three-phase bridge circuits, and its topology is as follows: figure 1 shown. It is an isolated bidirectional DC converter. It has the advantages of high power density, low switching stress and easy realization of soft switching. In addition, compared with the single-phase converter, this converter adopts a three-phase interleaved structure, which improves the power level and reduces the current ripple. It is suitable for medium and high power applications, suitable for hybrid electric vehicles, power electronic transformers, and smart grid energy storage systems. [0003] For the th...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/33523H02M3/33576
Inventor 王跃李卓强施伶崔耀黄珺雷万钧
Owner XI AN JIAOTONG UNIV
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