China's offshore wind energy resources are rich, with more than 18,000 kilometers of continental coastline, the sea area can be more than 3 million square kilometers, which is one of the most abundant wind energy resources in Shanghai. Offshore wind power is close to the power load center in the southeast coast, and the land resources are scarce. Offshore wind power can alleviate these problems. In order to seize the opportunity, the major energy companies in China “run the horse†and almost divide China into the sea area for offshore wind power. After completion, China's offshore wind power market is booming.
Offshore wind power, like wind power on the road, has volatility, intermittent and irregularity, which makes the contribution rate of wind power to the power grid less than 10%. At 10%, it will bring hidden dangers to the operation of the power grid. Offshore wind power also has the problem of “abandoning the wind†and needs to solve the problem of offshore wind power storage. The energy storage technology of onshore wind power is constantly improving. A number of new energy storage technologies are being developed. For example, new energy storage technologies such as wind power solid energy storage devices and solar solid energy storage devices have been developed. The earth enriches the energy storage methods of onshore wind power, but offshore wind power storage is still blank.
At present, the offshore wind power pumping energy storage system developed by the Fraunhofer Institute in Germany uses the energy storage of the pumped storage Power station located on the seabed. It uses the hollow ball in the deep water and uses the hollow ball to make use of it. The seawater pressure in the deep water stores energy. When energy is needed, electricity is pumped from the sphere. When energy is needed to be released, the water flows through the turbine and returns to the sphere, thereby driving the generator to generate electricity. Although this technology solves the problem of offshore wind power storage, it has defects. First of all, the scope of application is narrow. It is only suitable for deep water areas, because the deeper the water is, the higher the pressure is. Secondly, it needs multiple conversions, and the efficiency is low. The wind energy is converted into electric energy, and the electric energy is converted into mechanical energy to pump water, and the water can be converted into electric energy, and the efficiency is very low.
Recently, the "buoyancy and gravity composite energy storage offshore wind power generation system" developed by Zhang Zhanhai of Chengde City, Hebei Province has been successful. It mainly uses the buoyancy of sea water for energy storage. When there is wind at sea, the power grid is at the peak of power consumption. The wind power system works normally, the fan drives the engine to generate electricity; when there is wind at sea, the power grid is at the low peak of power consumption, the power is transmitted through the system, the buoy is pressed into the sea water, and the water bucket filled with sea water is raised to the sea surface, and the sea water is utilized. Buoyancy and gravity, the power is stored; when there is no wind at sea, the grid is in the peak period of power consumption, the buoys generate power upwards due to the buoyancy of the sea water, and the water bucket generates power downward due to the gravity of the sea water. The stored energy is released.
It is beneficial in that it adapts to local conditions and utilizes offshore wind power in abundant sea water. The seawater can generate buoyancy upwards and downward gravity, and the two forces can be effectively utilized to realize energy storage. Suitable for deep water areas, also suitable for shallow water areas; at the same time energy is directly converted, high efficiency.
The successful development of this offshore wind energy storage technology can not fill the gap of offshore wind energy storage technology, can effectively solve the problem of offshore wind power storage, and will promote the vigorous development of offshore wind power.
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