Offshore wind power system based on series hybrid converter station and starting control method thereof

Abstract

The invention provides an offshore wind power system based on a series hybrid converter station and a start control method thereof. The offshore wind power system comprises a shore converter station, one or more offshore converter stations and one or more sub-wind power plants. The direct current side of the shore converter station is connected in series with the direct current sides of one or more offshore converter stations, and the alternating current sides of the offshore converter stations are connected with the sub-wind power plants; the offshore converter station is composed of a diode rectifier, a high-potential converter, reactive compensation equipment and a high-pass filter, the diode rectifier is used for transmitting power from an alternating current side to a direct current side, and the high-potential converter is used for providing starting power of the sub-wind power plant and compensating reactive power; the reactive compensation equipment and the high-pass filter are used for compensating reactive power and filtering harmonic current generated by the diode rectifier; according to the scheme, high-potential equipment is greatly reduced, so that the size, the weight and the cost of the offshore converter station are reduced.

Description

technical field [0001] The present invention relates to the field of offshore wind power, and more specifically relates to an offshore wind power system based on a series hybrid converter station and a start-up control method thereof. Background technique [0002] With global warming, continuous increase in carbon dioxide emissions and the gradual depletion of traditional fossil energy, people are paying more and more attention to renewable energy, while the development technology of onshore solar and wind energy has been relatively mature and has been developed on a large scale. However, the construction and maintenance of offshore wind farms are very difficult because they are far from the shore. For offshore wind farms far from the shore, DC transmission has become the only alternative power transmission solution. [0003] At present, there have been many literatures on offshore wind farms connected in series on the DC side. The collection and transmission system of the o...

AI Technical Summary

Problems solved by technology

The existing offshore wind power system based on DC transmission uses high-voltage and large-capacity MMC to convert AC into DC. Due to the size and weight of MMC, the cost and weight of offshore converter stations are very high, which is not conducive to offshore conversion. Transport and installation of the flow station

The development of offshore wind farms from offshore to offshore has become a future trend, but the research on the development of offshore wind power in remote oceans is still in its infancy at home and abroad.

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