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Direct-current voltage transformation subunit and direct-current transformer comprising direct-current voltage transformation subunit

A transformer and converter technology, applied in the field of DC transformers, can solve the problems of large quality and occupied area, small quality and occupied area, and low cost of DC transformers, and achieve automatic isolation and ride-through, quality and The effect of small footprint and low cost

Pending Publication Date: 2020-05-01
CHINA EPRI ELECTRIC POWER ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the shortcomings of the above-mentioned DC transformers in the prior art that the quality and floor area are relatively large and the cost is high, the present invention provides a DC transformer subunit and a DC transformer including the DC transformer subunit. The DC transformer subunit includes The fault isolation voltage equalization module and the DC / DC converter are connected in series; the high voltage side of the fault isolation voltage equalization module is connected to the high voltage DC bus, and the low voltage side of the DC / DC converter is connected to the low voltage DC bus; the fault isolation voltage equalization module is used For isolating faults from HVDC bus / LVDC bus and realizing voltage equalization, the quality and footprint are small, and the cost is low

Method used

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  • Direct-current voltage transformation subunit and direct-current transformer comprising direct-current voltage transformation subunit
  • Direct-current voltage transformation subunit and direct-current transformer comprising direct-current voltage transformation subunit

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Embodiment 1

[0037] Embodiment 1 of the present invention provides a DC transformer subunit, such as figure 1 As shown, including fault isolation voltage equalization modules and DC / DC converters connected in series;

[0038] The high-voltage side of the fault isolation voltage equalization module is connected to the high-voltage DC bus, and the low-voltage side of the DC / DC converter is connected to the low-voltage DC bus;

[0039] The fault isolation voltage equalization module is used to isolate faults from the high-voltage DC bus / low-voltage DC bus and realize voltage equalization.

[0040] The fault isolation voltage equalization module includes a bypass switch K, a first IGBT module, a second IGBT module, a voltage equalization branch and a DC support capacitor branch;

[0041] The bypass switch K, the voltage equalization branch and the DC support capacitor branch are all connected between the positive high-voltage DC bus and the negative high-voltage DC bus, and the first IGBT mod...

Embodiment 2

[0070] Embodiment 2 of the present invention provides a DC transformer, such as figure 2 as shown, figure 2 in, V H is the voltage of the high-voltage DC bus, V L is the voltage of the low-voltage DC bus, and the DC transformer is located between the high-voltage DC bus and the low-voltage DC bus, which includes a plurality of DC transformer subunits, and Embodiment 2 of the present invention includes k DC transformer subunits;

[0071] The high-voltage side of the k DC transformer sub-units is connected in series and connected to the high-voltage DC bus to meet the requirements of the withstand voltage level;

[0072] The low-voltage sides of the k DC transformer sub-units are connected in parallel and connected to the low-voltage DC bus to meet high power requirements.

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Abstract

The invention provides a DC voltage transformation subunit and a DC transformer comprising the DC voltage transformation subunit. The DC voltage transformation subunit comprises a fault isolation voltage equalization module and a DC / DC converter, wherein a high-voltage side of the fault isolation voltage equalization module is connected with a high-voltage direct-current bus, a low-voltage side ofthe DC / DC converter is connected with a low-voltage DC bus, the mass and the occupied area are small, cost is low, a DC transformer of the DC voltage transformation subunit comprises a plurality of DC voltage transformation subunits. The DC voltage transformation subunit is advantaged in that high-voltage sides of a plurality of DC voltage transformation subunits are connected in series, withstand voltage class requirements are met, low-voltage sides of the multiple DC voltage transformation subunits are connected in parallel, the high-power requirement is met, the number of layers of the DCvoltage transformation subunits is greatly reduced, the occupied area is reduced, cost is saved, different application scenes of one-way power flowing and two-way power flowing can be met, and automatic isolation and crossing of faults on the high-voltage side can be achieved.

Description

technical field [0001] The invention relates to the technical field of direct current power transmission and distribution, in particular to a direct current transformation subunit and a direct current transformer including the direct current transformation subunit. Background technique [0002] In the AC power grid, voltage conversion and energy transfer can be realized only through power frequency transformers. However, the DC grid must rely on power electronic equipment to achieve voltage matching and energy interaction between different grids. [0003] The topological structures of DC transformers mainly include MMC topology, ultra-high voltage device topology and ISOP topology. Among them, the ISOP topology is the most widely used, and the ISOP topology realizes electrical isolation and voltage matching between different power grids through multiple high-frequency transformers. The series structure of the medium-voltage side solves the contradiction between the low wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32H02M3/335H02M3/28
CPCH02M1/32H02M3/285H02M3/33576H02M3/33584
Inventor 查鲲鹏燕翚朱宁辉顾然张加林
Owner CHINA EPRI ELECTRIC POWER ENG CO LTD
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