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Multi-end mixed DC power transmission system suitable for offshore wind power integration and start control method

A hybrid DC and power transmission system technology, applied in wind power generation, power transmission AC network, circuit devices, etc., can solve problems such as unseen research, and achieve the effect of convenient expansion, smooth and stable start-up process, and complete and clear start-up control strategy

Active Publication Date: 2019-08-02
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

How to smoothly start the multi-terminal VSC-PHC hybrid DC transmission system has not been studied in the literature at home and abroad

Method used

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  • Multi-end mixed DC power transmission system suitable for offshore wind power integration and start control method
  • Multi-end mixed DC power transmission system suitable for offshore wind power integration and start control method
  • Multi-end mixed DC power transmission system suitable for offshore wind power integration and start control method

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Experimental program
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Embodiment approach

[0021] figure 1 This is the topology diagram of the multi-terminal hybrid DC transmission system suitable for large-scale offshore wind power grid connection. In the figure, fan 1, gearbox 2, doubly-fed asynchronous motor 3, frequency converter 4, wind farm transformer 5, VSC AC side connection transformer and phase Reactor equivalent resistance 6, equivalent inductance 7, rectifier station VSC1 converter 10, AC filter 8, wind power plant n9, rectifier station VSCn converter 19, VSC DC side voltage stabilizing capacitor 11, DC line equivalent Resistor 12, DC line equivalent inductance 13, PHC inverter station DC voltage stabilizing capacitor 14, PHC inverter station VSC converter 15, PHC inverter station 12 pulsating LCC converter 16, PHC inverter station transformer 17, System side AC switch 18, AC system 20. AC auxiliary power supply 21 , current limiting resistor 22 , bypass switch 23 , and auxiliary power supply AC switch 24 .

[0022] Among them, the wind generator cons...

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Abstract

The invention relates to a multi-end mixed DC power transmission system suitable for offshore wind power integration and a start control method. According to the method, multiple VSC rectification stations are connected to a large-scale offshore wind power station, an LCC and VSC mixed parallel PHC inversion station as a power concentrated reception end is connected with an AC system, an LCC transverter in the PHC inversion station realizes large power transmission, a VSC transverter in the PHC inversion station carries out reactive compensation, the electric energy quality of an AC voltage bus is improved, and inversion failure is prevented effectively. The system is large in transmission capacity, low in cost and high in reliability; the start control method is complete and clear, and can be used to smoothly change the system from a complete shutdown state to a normal operation state. The system and method have unique advantages and competitiveness in the large-scale offshore wind power integration scheme, and has wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of electric power engineering. In particular, it relates to a multi-terminal hybrid direct current transmission system topology and start-up method suitable for grid-connected offshore wind power. (Multi-terminal Hybrid HVDC, a multi-terminal hybrid HVDC transmission technology of voltage source converter VSC and hybrid parallel converter PHC). Background technique [0002] The multi-terminal hybrid DC transmission system can derive different topological structures according to different application scenarios. The following topology can be used when large-scale offshore wind power is connected to the grid: the rectifier side uses multiple VSC rectifier stations to connect to the wind farm, and one end of the PHC inverter station is used as the centralized power receiving end to connect to the AC system. [0003] The active and non-functional VSC converters of the rectifier station are independently control...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/36
CPCH02J3/386H02J3/36H02J2203/20Y02E60/60
Inventor 余瑜李鸿亮徐立超田野吕爽
Owner HUBEI UNIV OF TECH