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Starting method of FMMC-LCC hybrid DC power 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, improved system operation reliability, and good DC short-circuit fault ride-through capability

Active Publication Date: 2016-06-01
XUJI GRP +4
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  • Abstract
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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

Method used

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  • Starting method of FMMC-LCC hybrid DC power transmission system
  • Starting method of FMMC-LCC hybrid DC power transmission system
  • Starting method of FMMC-LCC hybrid DC power 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 starting method of an FMMC-LCC hybrid DC power transmission system. A sending terminal is provided with a full-bridge submodule type modular multilevel converter (FMMC), a receiving terminal grid side is provided with a line commutation converter (LCC), and a receiving terminal AC side is configured with an AC charging power supply. By means of the characteristics of a full-bridge submodule structure in the FMMC, and an FMMC submodule capacitor can be still charged with a negative DC voltage built by the FMMC when no polarity reversed connection is carried out on the LCC at the receiving terminal; and meanwhile, through the rapid control capability of the FMMC, the voltage of a DC circuit can be instantly inverted when a normal running mode is switched. Therefore, the usage of an auxiliary device such as a large-capacity charging power supply or a DC operation switch is avoided, the cost is reduced, and the starting operation of the whole hybrid system is simple and clear and is easy to be implemented.

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