Hybrid direct current (DC) power transmission system based on line commutated converter (LCC)-alternate arm converter (AAC) type

A power transmission system, hybrid DC technology, applied in the direction of AC network voltage adjustment, power transmission AC network, reactive power compensation, etc.

Inactive Publication Date: 2017-08-29
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with traditional DC, there are disadvantages such as high engineering cost

Method used

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  • Hybrid direct current (DC) power transmission system based on line commutated converter (LCC)-alternate arm converter (AAC) type
  • Hybrid direct current (DC) power transmission system based on line commutated converter (LCC)-alternate arm converter (AAC) type

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Embodiment Construction

[0022] The present invention provides a hybrid DC power transmission system based on LCC-AAC; the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0023] Such as figure 1 The hybrid HVDC power transmission system shown includes a sending-end converter station and a receiving-end converter station; the sending-end converter station is an LCC system composed of a sending-end AC system and an LCC converter device; The AAC system composed of the system and the AAC converter; the DC side of the LCC system is correspondingly connected to the DC side of the AAC system through a DC transmission line.

[0024] The LCC system consists of a sending-end AC system, a sending-end converter transformer T S1 , LCC converter device, AC switch, sending-end AC filter ACF1, reactive power compensator, smoothing reactor L, control protection device and DC line; it is the rectification side of the hybrid DC transmission system; the AC end...

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Abstract

The invention discloses a hybrid direct current (DC) power transmission system based on a line commutated converter (LCC)-alternate arm converter (AAC) type, belonging to the field of high-voltage DC power transmission technology. The rectifier side of the hybrid DC power transmission system consists of an LCC, and the inverter side of the hybrid DC power transmission system consists of an AAC. The system disclosed by the invention combines the mature technology of an LCC technology, is low in cost, does not have commutation failure problems with the AAC, and has the capabilities of active and reactive power independent decoupling control and DC fault-ride through. As a novel hybrid DC power transmission system, the system disclosed by the invention combines the technical advantages of the LCC and the AAC, separately improves the own defects of the LCC and the AAC, reduces the size and weight of the converters, and is especially suitable for offshore drilling platforms and other occasions with higher space requirements.

Description

technical field [0001] The invention relates to the technical field of high-voltage direct current transmission, in particular to an LCC-AAC-based hybrid direct current transmission system. Background technique [0002] Line Commutated Converter High Voltage Direct Current (LCC-HVDC) based on the grid commutation converter has the characteristics of large transmission capacity, fast and controllable transmission power, and long transmission distance. It has been applied to many engineering projects in the world , mature technology and rich operating experience. However, because the traditional HVDC transmission system uses semi-controlled devices without self-shutdown capability, there is a risk of commutation failure during its operation, and it cannot be used as a recovery power source for a major power outage, and it needs to consume a large amount of reactive power. To a certain extent, it restricts its development. [0003] In recent years, with the advancement of pow...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/16
CPCH02J3/16H02J3/36Y02E40/30Y02E60/60
Inventor 郭春义赵成勇赵剑刘炜陆翌裘鹏宣佳卓
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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