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Start-up method of fmmc‑lcc hybrid direct current transmission system

A power transmission system, hybrid DC technology, applied in the direction of power transmission AC network, etc., to achieve the effects of easy implementation, simple start-up operation, and small capacity requirements

Active Publication Date: 2018-01-23
XUJI GRP +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for starting a FMMC-LCC type hybrid direct current transmission system to solve the problem of needing to configure an LCC polarity reverse switch in the prior art

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  • Start-up method of fmmc‑lcc hybrid direct current transmission system
  • Start-up method of fmmc‑lcc hybrid direct current transmission system
  • Start-up method of fmmc‑lcc hybrid direct current transmission system

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Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0021] The sending end of this embodiment takes an offshore wind farm as an example for illustration.

[0022] figure 1 It is the topology of the hybrid direct current transmission system targeted by the start-up method of the present invention, taking symmetrical unipolar wiring as an example. figure 1 Among them, the hybrid DC transmission system includes the sending end based on the full-bridge sub-modular modular multilevel converter, the receiving end and the DC line based on the grid commutation converter, and the wind farm side is equipped with a small-capacity AC charging power supply. The sending-end converter is located on the side of the offshore wind farm, and the receiving-end converter is connected to the large power grid. During normal operation, the sending-end converter converts wind energy into DC power, which is transmitted to the receivi...

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Abstract

The invention relates to a start-up method for a FMMC‑LCC type hybrid direct current transmission system. The sending end is a full-bridge sub-modular modular multilevel converter FMMC, the receiving end grid side is a grid commutation type converter LCC, and the sending end is an AC side. Equipped with AC charging power supply. With the help of the structure characteristics of the full-bridge sub-module in the FMMC converter, the present invention can still charge the capacitor of the FMMC sub-module through the negative DC voltage established by it when the polarity of the receiving end LCC is not reversed; at the same time, the FMMC can quickly Control capability that allows instant reversal of the DC link voltage when switching to normal operating mode. This not only avoids the use of auxiliary equipment such as a large-capacity charging power supply or a DC operating switch, and reduces costs, but also makes the start-up operation of the entire hybrid system simple, clear, and easy to implement.

Description

technical field [0001] The invention relates to a start-up method for an FMMC-LCC type hybrid direct current transmission system used for offshore wind power transmission. Background technique [0002] The hybrid DC transmission technology based on voltage source converters and current source converters combines the characteristics of mature traditional DC transmission technology, low cost, and flexible DC transmission technology with excellent regulation performance, no commutation failure, and strong scalability. An optimized configuration scheme with high technical economy. VSC-LCC hybrid DC transmission technology adopts voltage source converter VSC at the sending end, which can control the AC bus voltage, and adopts grid commutation converter LCC at the receiving end, so there is no need to consider commutation failure when connecting to the large power grid. Therefore, the hybrid DC transmission system is very suitable for grid-connected schemes of new energy such as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCY02E60/60
Inventor 杨美娟吴金龙张军张浩姚为正
Owner XUJI GRP
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