Offshore convertor station for flexible direct-current power transmission system

Abstract

The invention provides an offshore convertor station for a flexible direct-current power transmission system. The offshore convertor station comprises a closed upper structure and a foundation structure used for supporting the upper structure; the upper structure comprises a large-space main workshop and a small-space auxiliary workshop which are arranged side by side; the main workshop is dividedinto an upper layer and a lower layer, wherein the upper layer is provided with a current-limiting reactor, direct-current field equipment, a converter transformer, high-voltage switch equipment, a workshop electricity utilization system and an emergency diesel engine, and the lower layer is provided with a converter valve and a bridge arm reactor; the auxiliary workshop totally comprises six layers, the first layer is provided with a seawater pump room and valve cooling equipment, the second layer is provided with seawater treatment equipment, the third layer is provided with a valve controlroom, the fourth layer is provided with firefighting equipment, the fifth layer is provided with positive-pressure ventilation equipment, and the sixth layer is provided with a station control room;and the upper structure is overall symmetrically arranged, the foundation structure is a guide pipe frame, and a channel allowing a barge to enter or go out is reserved in the middle of the foundationstructure. The offshore convertor station has the characteristics of being compact and reasonable in arrangement, safe and reliable in operation and suitable for marine environment conditions and offshore construction.

Description

technical field [0001] The invention relates to an offshore converter station for a flexible direct current transmission system. Background technique [0002] Offshore wind power generation is an emerging industry that has developed rapidly in recent years. However, the offshore wind farms in my country are generally within 30km from the shore. Therefore, at present, the power of offshore wind power in my country is output through AC submarine cables. With the development of offshore wind power to a larger scale and longer distance, under normal circumstances, when the offshore wind farm distance exceeds 60km, it is obvious that the traditional AC transmission method is no longer economical. At this time, it should be considered suitable for large-capacity, long-distance The direct current transmission method of electric energy transmission. With the demand for transmission distance getting farther and greater for transmission capacity, direct current transmission will play...

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

Images