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Hybrid HVDC Topology System

A hybrid DC transmission and topology technology, applied in the direction of power transmission AC network, etc., can solve the problems of high loss and high cost of flexible DC

Active Publication Date: 2018-02-13
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The primary equipment of the flexible DC end of the traditional hybrid DC transmission topology is designed using the principle of the flexible DC transmission system, so it still has the disadvantages of high cost of flexible DC and relatively high loss

Method used

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Embodiment Construction

[0017] A hybrid DC transmission topology system such as figure 1 As shown, it includes a rectification-side converter station 100 and an inverter-side converter station 200 connected to the rectification-side converter station 100 .

[0018] The rectification-side converter station 100 includes a rectification-side converter transformer 110 and a grid-commutated converter 120 , and the grid-commutated converter 120 is connected to the rectification-side converter transformer 110 and the inverter-side converter station 200 . The converter transformer 110 on the rectification side is connected to the AC power for transformation processing and then output to the grid commutation converter 120. The grid commutation converter 120 rectifies the transformed AC power to obtain DC power and transmits it to the inverter side converter station 200.

[0019] The inverter-side converter station 200 includes a modular multilevel converter 210 adopting a full-bridge sub-module topology or a...

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Abstract

The invention relates to a hybrid direct current transmission topology system, which includes a rectification-side converter station and an inverter-side converter station connected to the rectification-side converter station. The rectification-side converter station includes a rectification-side converter transformer and a grid commutation converter , the inverter side converter station includes a modular multilevel converter using a full-bridge sub-module topology or a mixture of a full-bridge sub-module topology and a half-bridge sub-module topology, and an inverter connected to the modular multi-level converter side converter transformer. The hybrid DC power transmission topology system can be based on the traditional DC power transmission system, by replacing the grid commutation converter on the inverter side with a full-bridge sub-module topology or a mixture of full-bridge sub-module topology and half-bridge sub-module topology. The modular multilevel converter transforms the traditional DC transmission system into a flexible DC converter station, thus forming a hybrid DC topology. By retrofitting on the basis of the traditional DC transmission system, it is possible to make full use of the traditional DC transmission primary equipment at the transformed end, reduce the number of additional purchased equipment, shorten the renovation period, and reduce costs.

Description

technical field [0001] The invention relates to the technical field of direct current transmission systems, in particular to a hybrid direct current transmission topology system. Background technique [0002] At present, the HVDC transmission system mainly includes the traditional HVDC transmission system based on grid commutation technology (LCC-HVDC) and the flexible HVDC transmission system based on voltage source converter (VSC-HVDC). The traditional DC transmission system has large transmission capacity and low cost, but it has disadvantages such as easy commutation failure on the inverter side and strong dependence on the AC system. The flexible DC transmission system can independently adjust active power and reactive power, and has superior controllability and flexibility. It can effectively solve the problems of relatively insufficient local power support and weak voltage stability of the receiving end grid. However, the cost of flexible DC is relatively high. , and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 黄伟煌李明黎小林黄莹饶宏李岩许树楷刘涛寻斌斌李婧靓田凌钟澎
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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