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Bi-direction direct-current solid-state transformer with high-frequency alternating-current isolation link

A technology of solid-state transformers and isolation transformers, applied in the field of electric power, can solve problems such as the lack of bidirectional power transmission capabilities of DC transformers, and achieve the effects of improving system reliability, realizing voltage matching, and increasing power density

Inactive Publication Date: 2014-01-15
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent "Input Series Output Parallel Automatic Voltage Equalizing DC Transformer Based on Full-Bridge Topology" proposes an isolated DC transformer for high-voltage input and low-voltage output. However, due to the use of an uncontrolled rectifier bridge at the output end, the DC transformer does not have bidirectional power transfer capability

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  • Bi-direction direct-current solid-state transformer with high-frequency alternating-current isolation link
  • Bi-direction direct-current solid-state transformer with high-frequency alternating-current isolation link
  • Bi-direction direct-current solid-state transformer with high-frequency alternating-current isolation link

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Embodiment Construction

[0027] Specific embodiments of the present invention will be described in detail below in conjunction with the technical solutions of the present invention and the accompanying drawings.

[0028] The composition and structure of a bidirectional DC solid-state transformer with a high-frequency AC isolation link of the present invention is as follows: figure 1 shown. The bidirectional DC solid-state transformer is mainly composed of n identical DC converter units, n is a positive integer greater than or equal to 2; one port (low voltage end) of each DC converter unit is connected in parallel, and the other port of each DC converter unit One port (high voltage side) is serially connected in series.

[0029] The topology of each DC converter unit is a single-phase structure, including: two full-bridge converters H 1 、H 2 , an auxiliary inductor L, an isolation transformer T and two DC filter capacitors C 1 、C 2 , DC filter capacitor C 1 、C 2 respectively with the full-bridg...

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Abstract

The invention discloses a bi-direction direct-current solid-state transformer with a high-frequency alternating-current isolation link, and belongs to the technical field of electric power. The transformer is formed by connecting n identical direct-current transformer units at a low-voltage port in parallel and at a high-voltage port in series, wherein n is a positive integer larger than or equal to 2. Each direct-current transformer unit comprises two full-bridge transformers (H1 and H2), an auxiliary inductor (L), an isolation transformer (T) and two direct-current filter capacitors (C1 and C2), wherein the direct-current filter capacitors (C1 and C2) are connected with the direct-current ends of the full-bridge transformers (H1 and H2) respectively in parallel, the primary side and the secondary side of the isolation transformer are in parallel connection with the alternating current ends of the full-bridge transformers (H1 and H2) respectively, and the auxiliary inductor (L) is connected between the alternating current end of the full-bridge transformer H1 and the isolation transformer. Voltage matching of high-voltage and low-voltage direct-current links can be achieved, bi-direction flowing of power and electric isolation can be achieved, and the transformer has a certain application prospect in a direct-current power distribution network and a direct-current micro-grid.

Description

technical field [0001] The invention belongs to the technical field of electric power and relates to a solid-state transformer, in particular to a bidirectional DC solid-state transformer with a high-frequency AC isolation link. Background technique [0002] Due to its many advantages such as high modularity, high efficiency, high power density, low noise, and high intelligence, there have been many studies focusing on the use of power electronic transformers (also known as solid-state transformers SST) to replace traditional AC distribution transformers. Especially with the rapid development of distributed electric energy and energy storage in the smart grid, SST, as an integrated system of various distributed units, and a solution for flexible control of voltage and power flow, has received more and more attention. [0003] At present, the direct current transmission (VSC-HVDC) based on the voltage source converter (Voltage Source Converter, VSC) can independently and quic...

Claims

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Application Information

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IPC IPC(8): H02M3/28
Inventor 赵彪宋强刘文华
Owner TSINGHUA UNIV
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