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

Abstract

The present invention relates to an active soft start method, system and storage medium of a dual active bridge converter, which includes: after starting the dual active bridge converter, judging whether the preset first stage start condition is satisfied; determining the first Phase initial outward shift compared to D 0 , the primary edge is shifted inward compared to D 1 D 2 ;Judging whether the critical state between the first stage and the second stage is reached, after reaching the critical state, judging whether the pre-set second stage startup condition is met; after the second stage is started, determine the dual active bridge conversion of this stage Outward shift of the device compared to D′ 0 , the original side moves inward compared to D′ 1 Compared with the inward displacement of the original edge, D′ 2 ; When the secondary side bus voltage rises to the rated value, the soft start of the dual active bridge converter is completed. The invention accurately controls the external phase value, the primary internal phase value, and the secondary internal phase value of each switching cycle by collecting the primary and secondary voltages, and realizes the maximum power output of each cycle.

Description

A kind of active soft start method, system and storage medium of dual active bridge converter technical field The present invention relates to a kind of high-speed train and the converter technical field in the power grid, especially about a kind of double active bridge A converter active soft start method, system and storage medium. Background technique Dual active bridge transformer is a kind of isolated DC / DC converter, due to its good high-frequency isolation performance, soft switching It can be widely used in high-speed train traction converters, auxiliary converters, grid converters and other fields. Dual Active Bridge Converter It can realize DC-AC-DC power conversion, and its primary side full bridge can convert DC power into high-frequency AC power. It is sent to the medium / high frequency isolation transformer, and the secondary side rectifies the high frequency alternating current output by the medium / high frequency transformer into direct current. Afte...

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

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