An offshore converter station for flexible DC transmission system

Abstract

The invention provides an offshore converter station for a flexible direct current transmission system, which includes a closed superstructure and a basic structure for supporting the superstructure; the superstructure includes a large-space main plant and a small-space auxiliary Factory building; the main factory building is divided into upper and lower floors, of which the upper layer is equipped with current-limiting reactors, DC field equipment, converter transformers, high-voltage switchgear, plant power systems and emergency diesel engines, and the lower layer is equipped with converter valves and bridge arm reactors; The sub-plant has six floors, the first floor is equipped with seawater pump room and valve cooling equipment, the second floor is equipped with seawater treatment equipment, the third floor is equipped with valve control room, the fourth floor is equipped with fire protection equipment, the fifth floor is equipped with positive pressure ventilation equipment, and the sixth floor is set Station control room; the superstructure is generally symmetrically arranged, and the base structure is a jacket with a passage reserved for barges in and out. The technical scheme has compact and reasonable layout, safe and reliable operation, and adapts to marine environmental conditions and offshore construction characteristics.

Description

Technical field[0001]The present invention relates to a sea converting station for a flexible DC transmission system.Background technique[0002]Maritime wind power is an emerging industry, in recent years, it has developed rapidly, but the offshore distance from my country's sea wind farm is generally within 30km, so the electricity of my country's sea wind power is currently output by the exchange. As the sea wind power is larger, further distance development, in general, when the offshore distance of the sea wind farm exceeds 60km, it is obviously that the traditional AC transmission is not economical. At this time, it should be considered for large capacity, long distance. DC transmission of electrical energy transmission. As the transmission distance needs become farther and farther, the transmission capacity demand is getting bigger and larger, and DC transmission will play an important role in the development and utilization of the sea wind farm. It is necessary to build a sea ...

AI Technical Summary

Problems solved by technology

In these two schemes, if the detailed arrangement of converter transformers, high-voltage switches, and other HVAC, water supply and drainage equipment, etc., it will inevitably lead to the fact that their structures can only be non-eccentric in the direction of the short side of the horizontal plane. In the direction of the long side, the center of gravity will be heavily biased towards the side with more interlayers or higher floors (the total weight of the upper block of the offshore converter station is about 20,000 tons, and the eccentricity of the above scheme can reach at least 5m, then the The overturning moment will reach 100,000 tons), which will increase the design and construction difficulty of the pile foundation, jacket and upper block frame under the load condition of the marine environment, significantly increase the project cost, and have no practical application feasibility

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