Active clamping magnetic reset-based bi-directional AC-DC converter

A magnetic reset and clamping technology, which is applied in the output power conversion device, the conversion of AC power input to DC power output, and the conversion of DC power input to DC power output, etc., can solve problems such as unfavorable efficiency improvement, and achieve high utilization. , The output voltage range is wide, the effect of reducing switching loss

Inactive Publication Date: 2017-03-29
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention proposes a bidirectional AC-DC converter based on active clamp magnetic reset, so that the switching tubes of the three-phase rectification / inverting bridge and the bidirectional switching circuit on the AC side work in low-frequency mode, reducing the power consumption of the switching tubes on the AC side. Switching loss, the magnetic reset method of the transformer is an active clamp magnetic reset to reduce the voltage stress of the switch tube on the DC side, which solves the problem of the two-stage converter's two energy conversions and the high frequency failure of the switch tube on the AC side of the traditional space vector control. Technical Issues Contributing to Efficiency Improvement

Method used

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  • Active clamping magnetic reset-based bi-directional AC-DC converter

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Embodiment Construction

[0029] The invention will be described in further detail below in conjunction with the accompanying drawings.

[0030] The bidirectional AC-DC converter based on active clamp magnetic reset related to the present invention is as figure 1 As shown, it includes: AC side filter unit, three-phase rectification / inverter bridge arm, AC side switch circuit, high frequency isolation transformer, active clamp magnetic reset circuit, DC side switch circuit, and DC side filter unit.

[0031] Compared with the rectification mode, the inverter mode needs to control more switching tubes. Considering the complexity, we take the inverter mode as an example for analysis.

[0032] Based on the reference direction of the AC side current, define its three-valued logic function σ j :

[0033]

[0034] In formula (1), i jt is the j-phase current; j=(a,b,c), a represents phase a, b represents phase b, and c represents phase c.

[0035] Current space vector I k Definition:

[0036]

[003...

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Abstract

The present invention discloses an active clamping magnetic reset-based bi-directional AC-DC converter and belongs to the power conversion technical field. The converter is composed of an alternating current-side filtering unit, a three-phase rectifying/inverting bridge arm, an alternating current-side switching circuit, a high frequency isolation transformer, an active clamping magnetic reset circuit, a direct current-side switching circuit and a direct current-side filtering unit. According to the converter, the voltage stress of a direct current-side switching tube is low; an alternating current side switching tube works at a low frequency, so that switching loss is small; energy can flow bidirectionally; and high frequency electrical isolation can be realized. The active clamping magnetic reset-based bi-directional AC-DC converter is suitable for being adopted as an interface converter between a power grid and a storage battery.

Description

technical field [0001] The invention relates to a bidirectional AC-DC converter based on an active clamp magnetic reset, and belongs to the technical field of power conversion. Background technique [0002] In the AC micro-grid system, the power generation of new energy such as photovoltaics and wind power shows great fluctuations due to the influence of natural conditions, and the power grid itself does not have the function of storing energy, so energy storage devices are needed to maintain the power balance of the system and Stable, the battery has been widely used in the microgrid system due to its large storage energy, convenient installation and cost advantages. The battery is directly connected to the microgrid through an interface converter. During the peak period of power consumption, the battery is discharged to provide energy for the load; during the valley period of power consumption, the battery is charged to store excess energy. A bidirectional flow of energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/797H02M3/335
CPCH02M3/33584H02M7/797H02M1/0058Y02B70/10
Inventor 金科王正朔顾玲
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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