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Unipolar current interleaving with three-level submodules

A unipolar current, interleaved connection technology, applied in power transmission AC network, electrical components, conversion of AC power input to DC power output, etc. problems, to achieve the effect of saving auxiliary drive equipment and space volume, reducing power density and improving power density

Active Publication Date: 2019-03-29
TSINGHUA UNIV +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the flexible DC converter station adopting this scheme can only be used as the power receiving end of the DC transmission system, and cannot be used as the power transmitting end of the transmission system, so the application occasions are limited; The DC voltage operating range of the DC transmission system is very limited, which cannot meet the needs of DC voltage operation control in a large range, which is not conducive to DC fault recovery and lacks adaptability to AC grid voltage fluctuations

Method used

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  • Unipolar current interleaving with three-level submodules
  • Unipolar current interleaving with three-level submodules
  • Unipolar current interleaving with three-level submodules

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Embodiment Construction

[0027] The unipolar current cross-connected three-level (Cross-Connected3Level, CC3L) sub-module proposed by the present invention adopts a new cross-connected topology, which reduces the number of full-control power electronic switches while increasing the number of sub-module levels Quantity, improve sub-module power density, save auxiliary drive equipment and space volume. Further description is as follows in conjunction with the accompanying drawings and specific embodiments.

[0028] The unipolar current interleaved three-level sub-module proposed by the present invention includes two types of sub-modules, the CC3L sub-module 10 where the forward current flows out and the CC3L sub-module 20 where the forward current flows in, wherein:

[0029] 1) The CC3L sub-module 10 where the forward current flows out, such as figure 2 (a), including the first DC capacitor C 1 , the second DC capacitor C 2 , the first fully controlled power electronic switching device T 1 , the se...

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Abstract

The invention provides a unipolar current cross-connected three-level sub-module, and belongs to the field of a power electronic technology and power transmission and distribution. The sub-module comprises a first DC capacitor, a second DC capacitor, a first fully-controlled power electronic switch device, a second fully-controlled power electronic switch device, a fully-controlled power electronic switch unit, a first diode, a second diode and a diode unit; and two structures of the unipolar current cross-connected three-level sub-module with forward current outflow and the unipolar current cross-connected three-level sub-module with forward current inflow are provided according to different forward current directions. According to the unipolar current cross-connected three-level sub-module provided by the invention, the quantity of output levels of the sub-module can be improved when DC fault ride-through of a modular multilevel converter is achieved; the power density of the sub-module is improved; the cost is reduced; and auxiliary drive equipment and the spatial volume are saved.

Description

technical field [0001] The invention belongs to the field of power electronics technology and electric power transmission and distribution, and in particular relates to a three-level sub-module connected by unipolar current interleaving. Background technique [0002] Compared with the traditional high-voltage direct current transmission technology, the flexible high-voltage direct current transmission technology uses fully-controlled switching devices to realize the control of the converter, so it has the advantages of flexible control, free compensation of reactive power, and realization of conversion without relying on the AC system. It has been extensively researched and applied in recent years. Especially the flexible HVDC power transmission system based on the modular multilevel converter structure, many projects at home and abroad have been put into operation or are under construction. [0003] How to deal with DC short-circuit faults is an urgent technical problem to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/00H02J3/36
CPCY02E60/60
Inventor 魏应冬刘蓁姜齐荣李明曹润彬黄莹谢小荣袁志昌刘文华于心宇张树卿宋强韩英铎
Owner TSINGHUA UNIV
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