Offshore wind power generation system with seabed compressed air energy storage

Abstract

The invention relates to an offshore wind power generation system with seabed compressed air energy storage. The system comprises an offshore wind power generation unit, an air compression and expansion power generation unit and a seabed high pressure air energy storing device. When electricity generated by the offshore power generation unit exceeds the demand of a power grid, an air compressor ofthe air compression and expansion power generation unit is driven by surplus electricity to fill the seabed high pressure air energy storing device with high pressure air; when the load of the powergrid is increased while the load of the offshore wind power generation unit cannot meet the demand of the power grid, high pressure air in the seabed high pressure air energy storing device is released, and an expansion machine of the air compression and expansion power generation unit acts to drive a power generator to generate power so as to provide a power load to the power grid. According to the invention, energy is stored by means of compressed air to absorb surplus power when the wind power is relatively great and the demand on the load of the power grid is low while the compressed air stored in the seabed expands to act when the wind power is relatively small or the demand on the load of the power grid is high to provide power to the power grid, so that a power regulating function of the wind power generation system is achieved.

Description

technical field [0001] The invention belongs to the technical field of wind power generation and energy storage, in particular to an offshore wind power generation system with seabed compressed air energy storage. Background technique [0002] Wind power is the most promising renewable energy generation technology other than hydropower. In recent years, wind power has developed rapidly in my country. As of 2016, my country's cumulative installed wind power capacity has reached 168 million kilowatts, becoming a veritable wind power country. [0003] Due to the randomness of wind energy and the poor stability of wind power, the power of wind turbines is determined by the wind speed and cannot be adjusted arbitrarily according to the load demand of the grid. Therefore, conventional wind power requires certain other forms such as hydropower, thermal power, etc. The wind power generation unit is used to cooperate with the peak regulation, which has caused a certain burden on the...

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Problems solved by technology

[0005] In order to overcome the disadvantages of wind power instability and peak shaving difficulties in the above-mentioned prior art, the purpose of the present invention is to provide an offshore wind power generation system with submarine compressed air energy storage, which uses the submarine high pressure environment to store compressed air for energy storage, which can realize offshore energy storage. The load self-regulation function of wind turbines enhances the stability and reliability of wind power

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