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Active soft start method and system for dual-active bridge converter and storage medium

A source bridge converter and dual active bridge technology, applied in the field of converters, can solve the problems of slow charging, excessive time, and inapplicability, and achieve the effect of quick start and simple start process

Active Publication Date: 2021-07-23
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to reduce the start-up current impact, the existing soft-start strategy adopts a relatively slow charging method, which takes more time to complete the soft-start process of the dual active bridge. method cannot be applied

Method used

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  • Active soft start method and system for dual-active bridge converter and storage medium
  • Active soft start method and system for dual-active bridge converter and storage medium
  • Active soft start method and system for dual-active bridge converter and storage medium

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Embodiment

[0074] Such as figure 2 As shown, it is a dual active bridge converter applicable to the present invention, and the dual active bridge converter includes an input capacitor C 1 , primary side full bridge unit, secondary side full bridge unit, medium / high frequency isolation transformer T, primary side inductance L 1 , secondary inductance L 2 , the output capacitance C 2 composition. The primary side full bridge unit contains four switching tubes S 1 -S 4 , the secondary full-bridge unit contains four switching tubes S 5 -S 8 . Primary inductance L 1 , secondary inductance L 2 It can also be replaced by the leakage inductance of the isolation transformer T. The transformation ratio of the transformer is n:1. The primary input voltage is U 1 , the secondary output voltage is U 2 , u AB is the terminal voltage of primary side bridge arm, u CD is the terminal voltage of the secondary bridge arm.

[0075] Such as image 3 As shown, it is a schematic diagram illus...

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Abstract

The invention relates to an active soft start method and system for a dual-active bridge converter and a storage medium, and the method comprises the steps: judging whether a preset first-stage start condition is met or not after the dual-active bridge converter is started; determining an initial outer shift ratio D0, a primary inner shift ratio D1 and a primary inner shift ratio D2 in the first stage; judging whether a critical state between the first stage and the second stage is reached or not, and judging whether a preset second stage starting condition is met or not after the critical state is reached; after the second stage is started, determining the outer shift phase ratio D'0, the primary side inner shift phase ratio D'1 and the primary side inner shift phase ratio D'2 of the dual-active bridge converter in the stage; and when the secondary side bus voltage rises to a rated value, completing the soft start of the dual-active bridge converter. According to the invention, the external phase shift value, the primary side internal phase shift value and the secondary side internal phase shift value of each switching period in the starting process are accurately controlled by collecting the primary side voltage and the secondary side voltage, so that the maximum power output of each period is realized.

Description

technical field [0001] The invention relates to the technical field of converters in high-speed trains and power grids, in particular to an active soft-start method, system and storage medium for dual active bridge converters. Background technique [0002] Dual active bridge transformer is an isolated DC / DC converter, which is widely used in high-speed train traction converters, auxiliary converters, power grid converters and other fields due to its good high-frequency isolation performance and soft switching performance. . The dual active bridge converter can realize DC-AC-DC power conversion. The full bridge on the primary side can convert DC power into high-frequency AC power, and send it to the medium / high frequency isolation transformer, and the secondary side will convert the medium / high frequency transformer The output high-frequency alternating current is rectified into direct current. After this series of conversions, the advantages of high-frequency technology ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36H02M3/335
CPCH02M1/36H02M3/33576Y02B70/10
Inventor 赵楠郑泽东李驰张志学陈涛苏亮亮
Owner TSINGHUA UNIV
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