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Single-stage three-phase high-frequency link combined bidirectional AC/DC converter

A three-phase high-frequency, high-frequency transformer technology, applied in the direction of converting AC power input to DC power output, collectors, output power conversion devices, etc., can solve the problem of low power density, low life of DC bus electrolytic capacitors, and conversion efficiency. Not ideal, etc.

Pending Publication Date: 2021-04-20
QINGDAO UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] Bidirectional AC / DC converter is an important link between electric vehicles and power grids. Existing research mainly focuses on two-stage structures. This type of structure has two-stage power conversion, low power density, unsatisfactory conversion efficiency, and long life of DC bus electrolytic capacitors. low level problem

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  • Single-stage three-phase high-frequency link combined bidirectional AC/DC converter

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Embodiment Construction

[0019] The technical solution of the present invention will be described in further detail below through specific examples in conjunction with the accompanying drawings.

[0020] A single-stage three-phase high-frequency link combined bidirectional AC / DC converter is composed of a three-phase AC filter, a three-phase cycloconverter, n primary side series high-frequency transformers, and n output parallel high-frequency bidirectional full-bridge rectifiers , DC filters are cascaded in sequence, wherein each secondary side of the transformer is respectively connected to a high-frequency bidirectional full-bridge rectifier, and the output terminals of n full-bridge rectifiers are connected in parallel. The single-stage three-phase high-frequency link combination bidirectional AC / DC converter adopts the dual current loop direct active power partition SVPWM control strategy, which realizes the control of the DC side current and the unit power factor of the AC side. The converter can...

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Abstract

The invention relates to a single-stage three-phase high-frequency link combined bidirectional AC / DC converter which is formed by sequentially cascading a three-phase alternating current filter, a three-phase cycle converter, n primary side series high-frequency transformers, n output parallel high-frequency bidirectional full-bridge rectifiers and a direct current filter. The secondary side of each transformer is connected with a high-frequency bidirectional full-bridge rectifier; and the output ends of the n full-bridge rectifiers are connected in parallel. According to the single-stage three-phase high-frequency link combined bidirectional AC / DC converter, a double-current-loop direct active power partition SVPWM control strategy is adopted, direct-current-side current and alternating-current-side unit power factor control is achieved, the converter can work in a rectification and inversion mode, and a bidirectional power flow is achieved. The converter belongs to single-stage power conversion, does not have a direct-current link, solves the problems of a short service life and the like of a direct-current bus electrolytic capacitor, and improves the reliability of the converter; and the n transformer-full-bridge rectifiers with the primary sides connected in series and the secondary sides connected in parallel are combined, the capacity of the converter is improved, and the converter is suitable for high-power occasions.

Description

Technical field: [0001] The invention relates to a single-stage three-phase high-frequency link combined bidirectional AC / DC converter, which belongs to the field of electric energy conversion. Background technique: [0002] With the rapid development of the economy and the improvement of living standards, automobiles have become an indispensable means of transportation. Using new energy to gradually replace traditional fossil fuels to drive automobiles is an inevitable trend in the future development of the automobile industry. With the support of new infrastructure, the construction of charging equipment has also developed rapidly with the increase in the number of electric vehicles, and has a broad space for development. [0003] A large number of electric vehicles are connected to the grid, which also makes the rational use of the interaction between vehicles and the grid to achieve optimal charging become a research hotspot. If these vehicles are allowed to absorb ener...

Claims

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Application Information

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IPC IPC(8): H02M7/797H02M1/42H02J3/32B60L53/22B60L55/00
CPCY02T10/70Y02T10/72Y02T10/7072Y02T90/14
Inventor 江加辉张韬马大壮陈道炼
Owner QINGDAO UNIV
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