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High-voltage direct-current direct-current (HVDC-DC) power electronic converter transformer

A technology of power electronics and high-voltage DC, which is applied in the direction of converting DC power input to DC power output, adjusting electrical variables, and converting AC power input to DC power output. Improve the efficiency of electric energy conversion, reduce volume and weight, and improve operating efficiency

Inactive Publication Date: 2010-08-04
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of multiple power frequency transformers will increase the volume and weight of the device, and will also lead to a decrease in power conversion efficiency
In addition, in the Chinese patent 200780049442.3, diodes are connected in series between the voltage source converters connected in series, which makes the device unable to realize the bidirectional flow of electric energy

Method used

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  • High-voltage direct-current direct-current (HVDC-DC) power electronic converter transformer
  • High-voltage direct-current direct-current (HVDC-DC) power electronic converter transformer

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Embodiment Construction

[0019] The overall structure of the high-voltage DC-DC power electronic transformer of the present invention is as follows: figure 1 As shown, it consists of a cascaded modular converter 1, a double-winding intermediate frequency or high frequency transformer 2 and a fully controlled H-bridge 3 based on fully controlled power electronic switching devices.

[0020] The cascaded modular converter 1 is composed of two identical bridge arms, the upper ends of the two bridge arms are connected to the positive pole P of the input DC voltage, and the lower ends are connected to the negative pole N of the input DC voltage. Such as figure 1 As shown, among the two bridge arms, each bridge arm presses the midpoint r 1 or r 2 It is divided into an upper half-bridge arm and a lower half-bridge arm. The upper and lower half-bridge arms are composed of the same number of sub-modules connected end-to-end and cascaded. Such as figure 2 As shown, the fully controlled bridge arm of the sub...

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Abstract

The invention relates to a high-voltage direct-current direct-current (HVDC-DC) power electronic converter transformer comprising a cascade modular converter (1), a double-winding medium or high-frequency transformer (2) and a fully-controlled H bridge (3). The cascade modular converter (1) consists of two same bridge arms, and the two bridge arms are formed by connecting the same number of sub-modules end to end in a cascading way; the middle points of both the two bridge arms are respectively connected with two leads of the primary side of the double-winding medium or high-frequency transformer (2); and the secondary side of the double-winding medium or high-frequency transformer (2) is directly connected with the fully-controlled H bridge (3) or is connected in series with a resonant capacitor (5) between the double-winding medium or high-frequency transformer (2) and the fully-controlled H bridge (3). The HVDC-DC power electronic converter transformer can realize the conversion of the high-voltage DC voltage and the low-voltage DC voltage and has the electrical isolation function. Compared with the prior HVDC-DC converting device, the HVDC-DC power electronic converter transformer has the advantages of small volume and light weight.

Description

technical field [0001] The invention relates to a high-voltage DC-DC power conversion and transmission device, in particular to a high-voltage DC-DC power electronic transformer. Background technique [0002] HVDC (High Voltage Direct Current) technology is usually used to transmit high-power electrical energy from long-distance power plants to electrical equipment, and the transmission lines can be overhead lines or submarine cables. HVDC technology can also be used to connect two separate grids when traditional AC interconnection solutions are not feasible. Generally HVDC transmission system has lower cost and higher efficiency than AC transmission system. In AC transmission systems, mains power can be tapped to loads through power transformers along the power transmission line. However, for the HVDC transmission system, since the power transformer cannot transmit DC power, it is generally necessary to establish a converter station when it is necessary to supply power to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/315H02M7/757
CPCH02M2007/4835H02M7/4835H02M1/0095
Inventor 李子欣王平李耀华刘丛伟朱海滨
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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