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Offshore wind turbine device and method for pumping seawater for energy storage and power generation

A technology for energy storage power generation and wind turbines, which is applied in the field of offshore wind turbine installations. It can solve the problems of low power generation efficiency, occupying the inner space of the tower, and complex structure of the device, so as to achieve fast power adjustment response, save investment costs, and lighten the engine room. effect of weight

Active Publication Date: 2021-09-21
CHINA THREE GORGES CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The device of this invention has a complex structure, and the arrangement of water turbines at the water inlet and outlet of the tower has high requirements for the design of the tower, and the tower will also have a certain impact on its structural performance after storing water
At the same time, the tower, as a device for storing seawater, occupies the original internal space of the tower, which will also have an adverse effect on the operation and maintenance of the wind turbine in the later period.
In addition, the device uses the power generated by the wind turbine to drive the water pump to pump water and supply energy. The energy undergoes multiple conversions of mechanical energy, electrical energy, mechanical energy, gravitational potential energy, kinetic energy, and electrical energy, and the power generation efficiency of the device is low.

Method used

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  • Offshore wind turbine device and method for pumping seawater for energy storage and power generation
  • Offshore wind turbine device and method for pumping seawater for energy storage and power generation
  • Offshore wind turbine device and method for pumping seawater for energy storage and power generation

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Embodiment

[0081] Take the NREL 5MW wind turbine as an example, the hub height is 90m, the impeller diameter is 126m, and the cut-in and cut-out wind speeds are 3m / s and 25m / s respectively.

[0082] The size of the water storage tank 13 is 10 * 5 * 6m 3 (length×width×height), the theoretically storeable energy of the water storage tank 13 can be calculated by the following formula: E = wxya S g H T (1);

[0083] In the formula: E for energy; ρ is the seawater density, ρ =1050kg / m 3 ; is the length of the tank, L =10m; W is the width of the tank, W =5m; H S is the height of the tank, H S =6m; g is the acceleration of gravity, g =9.8m / s 2 ; H T is the hub height of the wind turbine, H T =90m. According to the formula (1), it can be calculated that the storage tank can theoretically store energy E =77.18kW·h. That is to say, the offshore wind turbine device can also be equipped with an energy storage capacity of 77.18kW h while generating power, which can effec...

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Abstract

The invention discloses an offshore wind turbine device for pumping seawater for energy storage and power generation. The offshore wind turbine device comprises a wind turbine foundation, a power generation system, a water storage system and a wind turbine, wherein the lower end of a tower of the wind turbine is connected with the wind turbine foundation; a cabin is located at the top of the tower; a water storage tank and a water pump of the water storage system are located in the cabin, and the water storage tank is higher than the power generation system; the power generation system is located on the wind turbine foundation and above the sea level; a wind turbine impeller directly drives a water pump to pump the seawater into the water storage tank, and the mechanical energy of the water pump is converted into gravitational potential energy of the seawater; the seawater flows down from the height position of the water storage tank, and the gravitational potential energy is converted into kinetic energy to push the water turbine of the power generation system to rotate; a rotating shaft of the water turbine drives a generator set to generate electricity; and a water-turbine generator set control system controls the water turbine and the generator set to operate. According to the device, the water storage tank is located at the position of the cabin, and the power generation system is located on a fan foundation platform, so that the device is easily applied to practical engineering, and the impact of unstable output power of the wind turbine on a power grid can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of power generation and new energy, and relates to an offshore wind turbine device and method for pumping seawater to store energy for power generation. Background technique [0002] Wind energy is a clean and renewable energy source. Compared with onshore wind power, the underlying surface of offshore wind power has less roughness and fewer surrounding shelters, making offshore wind energy resources more abundant. A wind turbine is a power device that converts wind energy into electrical energy. When the incoming wind passes through the wind turbine, it drives the impeller to rotate, and then the impeller drives the generator to generate electricity through the gearbox. Due to the random and intermittent characteristics of the incoming wind, the output power of the wind turbine is unstable, which will affect the stability of the grid operation in the case of grid connection. In addition, when the wind turb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03D9/14F03D7/02F03B13/06F03B15/00
CPCF03D9/14F03D7/02F03B13/06F03B15/00F05B2220/706Y02P80/10Y02E60/16Y02E70/30Y02E10/20Y02E10/72
Inventor 张子良罗仑博易侃
Owner CHINA THREE GORGES CORPORATION
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