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Modular low-voltage AC-DC hybrid power electronic transformer topology and its control method

An AC-DC hybrid, power electronics technology, applied in the direction of converting DC power input to DC power output, AC power input converting to AC power output, AC power input converting to DC power output, etc. being mentioned or discussed, etc.

Active Publication Date: 2021-01-19
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Power electronic transformer topologies capable of this function have not been mentioned or discussed in the current literature

Method used

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  • Modular low-voltage AC-DC hybrid power electronic transformer topology and its control method
  • Modular low-voltage AC-DC hybrid power electronic transformer topology and its control method
  • Modular low-voltage AC-DC hybrid power electronic transformer topology and its control method

Examples

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Embodiment 1

[0060] Embodiment 1: A power electronic transformer with 10kV AC at the input side, 0.38kV three-phase four-wire AC at the output side and ±375V bipolar DC.

[0061] use as Figure 10 The topology shown, a modular low-voltage AC-DC hybrid power electronic transformer topology consists of an input stage, an isolation stage, and an output stage.

[0062] The input stage is a three-phase series H-bridge, and each phase includes 2N identical series-connected single-phase H-bridge converters, where N is a positive integer, connected in series to one phase of the power grid through a reactor G. The cascaded number of single-phase H-bridge converters for each phase is determined by the input voltage level and the level of selected power electronic devices. In this embodiment, the input voltage is 10kV (line voltage), the input stage is connected in star form, and when the IGBT with a withstand voltage of 3.3kV is selected and the DC voltage is set to 2500V, each phase includes 4 sin...

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Abstract

The invention discloses a modular low-voltage AC-DC hybrid power electronic transformer topology and a control method thereof. The modular low-voltage AC-DC hybrid power electronic transformer topology comprises an input stage, an isolation stage and an output stage. The input stage adopts three-phase series H-bridge converters. The isolation stage adopts dual-active full-bridge converters. The output stage adopts a three-phase two-level converter. A DC port of each H-bridge converter is connected with a primary side DC port of one dual-active full-bridge converter. The dual-active full-bridgeconverters of the isolation stage are divided into two groups, and the secondary side DC ports of the dual-active full-bridge converters are connected in parallel, wherein the positive electrode of afirst group of dual-active full-bridge converters after the secondary side DC ports are connected in parallel is used as the positive electrode of a low-voltage DC port of the power electronic transformer, the negative electrode of a second group of dual-active full-bridge converters after the secondary side DC ports are connected in parallel is used as the negative electrode of the low-voltage DC port of the power electronic transformer, and the negative electrode of the first group and the positive electrode of the second group are connected to be used as a neutral point of the low-voltageDC port of the power electronic transformer.

Description

technical field [0001] The invention belongs to the technical field of power electronic transformers, and in particular relates to a topology of a modular low-voltage AC-DC hybrid power electronic transformer and a control method thereof. Background technique [0002] Traditional power transformers are simple in structure, high in efficiency and high in reliability, and are widely used in power systems. However, the low operating frequency makes the traditional transformer bulky and bulky, and mineral oil, epoxy resin, and flame retardant oil are used as insulation or cooling media, which have potential hidden dangers of fire and environmental pollution. In addition, it can usually only achieve relatively single functions such as electrical isolation, voltage level conversion, and bidirectional power transfer, but has no functions such as grid-side power quality adjustment, harmonic transfer isolation, overload and fault protection, and load voltage regulation. These weakne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M5/458H02M7/219H02M1/10
CPCH02M1/10H02M3/33523H02M3/33576H02M5/4585H02M7/219
Inventor 欧阳少迪刘进军杨跃陈晖陈星星宋曙光
Owner XI AN JIAOTONG UNIV