CN113417803B - Offshore wind turbine device and method for pumping seawater to store energy and generate power - Google Patents
Offshore wind turbine device and method for pumping seawater to store energy and generate power Download PDFInfo
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- CN113417803B CN113417803B CN202110773216.1A CN202110773216A CN113417803B CN 113417803 B CN113417803 B CN 113417803B CN 202110773216 A CN202110773216 A CN 202110773216A CN 113417803 B CN113417803 B CN 113417803B
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- 239000013535 sea water Substances 0.000 title claims abstract description 95
- 238000005086 pumping Methods 0.000 title claims description 74
- 238000000034 method Methods 0.000 title claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 504
- 238000010248 power generation Methods 0.000 claims abstract description 41
- 238000005381 potential energy Methods 0.000 claims abstract description 40
- 230000005611 electricity Effects 0.000 claims description 26
- 238000004146 energy storage Methods 0.000 claims description 26
- 230000008569 process Effects 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 230000001276 controlling effect Effects 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 230000001133 acceleration Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 230000002411 adverse Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/10—Combinations of wind motors with apparatus storing energy
- F03D9/13—Combinations of wind motors with apparatus storing energy storing gravitational potential energy
- F03D9/14—Combinations of wind motors with apparatus storing energy storing gravitational potential energy using liquids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
- F03B13/06—Stations or aggregates of water-storage type, e.g. comprising a turbine and a pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03B—MACHINES OR ENGINES FOR LIQUIDS
- F03B15/00—Controlling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D7/00—Controlling wind motors
- F03D7/02—Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2220/00—Application
- F05B2220/70—Application in combination with
- F05B2220/706—Application in combination with an electrical generator
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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- Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
- Wind Motors (AREA)
Abstract
The sea 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 barrel of the wind turbine is connected with the wind turbine foundation, a cabin is positioned at the top of the tower barrel, a water storage tank and a water pump of the water storage system are positioned in the cabin, the water storage tank is higher than the power generation system, the power generation system is positioned on the wind turbine foundation and is higher than the sea level, an impeller of the wind turbine directly drives the water pump to pump seawater into the water storage tank, 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, the gravitational potential energy is converted into kinetic energy to push a water turbine of the power generation system to rotate, a rotating shaft of the water turbine drives a power generation set to generate power, a control system of the water turbine power generation set controls the water turbine and the power generation set to operate, the water storage tank of the device is positioned on the cabin, the power generation system is positioned on a platform of the wind turbine foundation, and can effectively reduce impact of unstable output power on a power grid.
Description
Technical Field
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
Wind energy is a clean and renewable energy source, and compared with onshore wind power, offshore wind power has small roughness of the underlying surface and fewer shields around, so that offshore wind power resources are richer. The wind turbine is a power device for converting wind energy into electric energy, incoming wind pushes the impeller to rotate when passing through the wind turbine, and then the impeller drives the generator to generate electricity through the gear box. Due to the characteristics of randomness and intermittence of incoming wind, the output power of the wind turbine is unstable, and the stability of the operation of a power grid is influenced under the condition of grid connection. In addition, when the generated energy of the wind turbine is not matched with the power consumption, the conditions of 'wind abandon' or 'power limitation' can be caused, and the waste of energy and the increase of the regulation and control cost of a power grid are caused.
The combination of the wind power generation device and the energy storage device is one of the approaches for solving the problems, and when the wind turbine has large power generation power but small power load, the energy storage device stores the residual energy; when the wind turbine has low generating power but large power load, the energy storage device releases energy to provide the energy to a user side, and the impact of intermittent generation of the wind turbine on a power grid can be effectively relieved through the way. At present, compressed air energy storage, battery energy storage, water pumping energy storage and the like are common energy storage modes. Compared with other energy storage modes, the water pumping energy storage mode has the advantages of large energy storage, simple structure and the like, and meanwhile, the water pumping energy storage mode has better application prospect in offshore wind power because the utilization of seawater resources is not limited at sea.
Chinese patent CN 108843504A (Sun China, etc.) and Chinese patent CN 103410651A (Anli, etc.) respectively provide an offshore wind power generation device combining water pumping and energy storage, an energy storage tank of the device is positioned on a seabed, high-pressure seawater flows into the energy storage tank and drives a water turbine to generate electricity, and then the generated energy of the wind turbine drives a water pump to discharge the seawater in the energy storage tank. Because the energy storage tank needs to be installed on the seabed and is suitable for the environment with larger water depth, the energy storage device has high manufacturing cost and higher requirements on geological conditions and marine environment, and is difficult to popularize and apply on a large scale. Chinese patent CN 202645871U (Anli strong, etc.) provides an offshore wind power generation system with water pumping, energy storage and energy supply functions, the invention divides a tower barrel of a wind turbine into an upper cavity and a lower cavity, hydraulic generators are respectively arranged at a water outlet of the upper cavity and a water inlet of the lower cavity, the generated energy of the wind turbine drives a water pump to pump seawater in the lower cavity to the upper cavity, and then the seawater flows out of the upper cavity to further drive the two hydraulic generators to generate power. The device disclosed by the invention is complex in structure, the arrangement of water turbines at the water inlet and the water outlet of the tower drum has high design requirements on the tower drum, and the structural performance of the tower drum is also influenced after water is stored in the tower drum. Meanwhile, the tower barrel occupies the internal space of the original tower barrel after being used as a device for storing seawater, and adverse effects can be generated on the operation and maintenance of the wind turbine in the later period. In addition, the device drives the water pump to pump water and supply power through the generated energy of the wind turbine, the energy is subjected to multiple conversions of mechanical energy, electric energy, mechanical energy, gravitational potential energy, kinetic energy and electric energy, and the generating efficiency of the device is low.
Disclosure of Invention
The invention aims to solve the technical problem of providing an offshore wind turbine device and method for pumping seawater to store energy to generate electricity, which have simple structure, directly drive a water pump to pump water to store energy and generate electricity through a wind turbine impeller, wherein a water storage tank is positioned at the position of a cabin, and a power generation system is positioned on a wind turbine base platform, so that the offshore wind turbine device and method are easy to apply to actual engineering, and can effectively reduce the impact of unstable output power of the wind turbine on a power grid.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: an offshore wind turbine device for pumping seawater, storing energy and generating power comprises a wind turbine foundation, a power generation system, a water storage system and a wind turbine; the power generation system is positioned on the foundation of the wind turbine and is higher than the sea level, the water storage tank of the water storage system is higher than the power generation system, the water storage tank converts gravitational potential energy into kinetic energy to push the water turbine of the power generation system to rotate, the rotating shaft of the water turbine drives the generator set to generate power, and the water turbine generator set control system controls the water turbine and the generator set to operate; the lower end of a tower tube of the wind turbine is connected with a foundation of the wind turbine, the engine room is positioned at the top of the tower tube, and the water storage tank and the water pump are positioned in the engine room.
And a sewer pipeline and a water pumping pipeline of the power generation system are positioned in the tower.
The sewer pipeline is connected with the water storage tank and the water turbine, a sewer pipeline valve is arranged on the sewer pipeline, and the water outlet pipeline is connected with the water turbine.
The water pumping pipeline is connected with the water pump and the seawater inlet container, and a water pumping pipeline valve is arranged on the water pumping pipeline.
The water pump is connected with a high-speed shaft of the wind turbine, the water storage tank is communicated with the water pump, the high-speed shaft is connected with the gearbox, the low-speed shaft is connected with the gearbox and the impeller, and the impeller is connected with the wind turbine control system.
And a filter screen is arranged on the seawater inlet container.
And a water level meter is arranged in the water storage tank and is connected with a water level control system of the water storage tank.
Stored energy of the reservoirE=ρLWH S gH T In the formulaEIn order to be able to provide energy,ρis the density of the seawater, and is,Lin order to be the length of the reservoir,Wthe width of the water storage tank is the width of the water storage tank,H S is the height of the water storage tank,gin order to be the acceleration of the gravity,H T is the wind turbine hub height.
When the energy captured by the wind turbine is equal to the electricity load, the energy is generated by the generator set and is supplied to the user end; when the energy captured by the wind turbine is larger than the power load, if the water level in the water storage tank does not exceed the critical high water level line, one part of the energy is generated by the generator set and then supplied to the user side, the rest part of the energy is stored in the water storage tank in a seawater gravitational potential energy mode, if the water level in the water storage tank exceeds the critical high water level line, one part of the energy is generated by the generator set and then supplied to the user side, and the rest part of the energy is lost; when the energy captured by the wind turbine is smaller than the power load, if the water level in the water storage tank is higher than the critical low water level line, the energy captured by the wind turbine is completely generated by the generator set, part of the generated energy is obtained by converting the gravitational potential energy of the seawater in the water storage tank, and finally the two parts of the generated energy are supplied to the user side together.
The power generation method of the offshore wind turbine device for pumping seawater, storing energy and generating power comprises the following steps:
s1, driving, namely pushing an impeller to rotate when free incoming flow passes through a wind turbine, controlling the operation of the impeller through a wind turbine control system, driving a low-speed shaft to rotate by the impeller, driving a gearbox to drive a high-speed shaft to rotate by the low-speed shaft, and driving a water pump to operate by the high-speed shaft; in the process, the wind turbine is in a working state of capturing the energy of incoming wind;
s2, storing energy, wherein after the water pump runs, the seawater enters a seawater inlet container after passing through a filter screen and enters a water storage tank along a water pumping pipeline to finish energy storage; in the process, the mechanical energy of the water pump is converted into the gravitational potential energy of the seawater; the flow of the water pumping pipeline is adjusted through a valve of the water pumping pipeline;
s3, potential energy is used for power generation, water in the water storage tank flows out through a sewer pipeline, water in the sewer pipeline flows down from the height of the cabin, the water turbine is pushed to rotate, and the water is discharged into the sea through a water outlet pipeline to complete the whole cycle; in the process, the gravitational potential energy of the seawater is converted into kinetic energy;
in S3, the water turbine drives a rotating shaft of the water turbine to rotate, and drives a generator set to generate electricity;
in S3, the water turbine generator set control system is used for controlling the normal operation of the water turbine and the generator set;
in S3, the flow of the sewer pipeline is adjusted through a sewer pipeline valve;
in S3, a water level meter is arranged in the water storage tank and used for monitoring the water level of the water storage tank;
in S3, the water level control system of the water storage tank is used for controlling a water pumping pipeline valve and a sewer pipeline valve so as to adjust the water level in the water storage tank;
in S1, the wind turbine control system ensures that the impeller of the wind turbine operates under the optimal design working condition through torque control and yaw control, and the impeller drives the water pump to operate after rotating through the low-speed shaft, the gearbox and the high-speed shaft;
in S1-S3, under the action of a water pump, seawater enters a water storage tank after passing through a filter screen, a seawater inlet container and a water pumping pipeline, and then flows out along a sewer pipeline;
in S1-S3, when the energy captured by the wind turbine is equal to the electric load;
because the energy captured by the wind turbine is equal to the electric load, the water level control system of the water storage tank adjusts the water pumping pipeline valve and the sewer pipeline valve through signals transmitted by the water level gauge, so that the flow in the water pumping pipeline and the flow in the sewer pipeline are equal; the flow rate of the seawater entering and flowing out of the water storage tank is equal, the water level in the water storage tank is kept unchanged, namely, the energy is not added in the water storage tank for storage or release;
after the seawater flows out along the sewer pipe, the gravitational potential energy is converted into kinetic energy to push the water turbine to rotate, so that the generator set is driven to generate electricity through the rotating shaft of the water turbine, and the water turbine and the generator set are controlled by the water turbine generator set control system to operate under the optimal working condition; under the condition, the energy captured by the wind turbine is completely generated by the generator set and finally supplied to the user side;
in S1-S3, when the energy captured by the wind turbine is larger than the electric load;
because the energy captured by the wind turbine is larger than the power load, according to the difference between the energy captured by the wind turbine and the power load, the water level control system of the water storage tank adjusts the water pumping pipeline valve to be larger than the outflow capacity through the signal transmitted by the water level meter, and the water level in the water storage tank is gradually increased;
when the water level monitored by the water level gauge does not exceed the critical high water level line, seawater flows out along a sewer pipeline, gravitational potential energy is converted into kinetic energy to push the water turbine to rotate, so that the water turbine rotating shaft drives the generator set to generate power, and the water turbine generator set control system controls the water turbine and the generator set to operate under the optimal working condition; in this case, a part of the energy captured by the wind turbine is generated by the generator set and then supplied to the user side, and the rest is stored in the water storage tank in the form of seawater gravitational potential energy;
when the water level monitored by the water level gauge exceeds a critical high water level line, the water level gauge transmits a signal to the water storage tank water level control system, and the water storage tank water level control system adjusts a water pumping pipeline valve and a sewer pipeline valve through the signal transmitted by the water level gauge so as to enable the flow in the water pumping pipeline and the flow in the sewer pipeline to be equal; the capacity of the seawater entering and flowing out of the water storage tank is equal, and the water level in the water storage tank is kept unchanged; after the seawater flows out along the sewer pipe, the gravitational potential energy is converted into kinetic energy to push the water turbine to rotate, and the generator set is driven to generate electricity through the rotating shaft of the water turbine; meanwhile, according to the difference between the incoming flow energy and the electrical load, the water turbine generator set control system controls the operation of the water turbine and the generator set, and at the moment, the water turbine and the generator set do not operate under the optimal working condition; one part of the energy captured by the wind turbine is used for generating electricity through the generator set and then supplied to a user side, and the rest part of the energy is lost at the water turbine and the generator set;
in S1-S3, when the energy captured by the wind turbine is less than the electric load;
because the energy captured by the wind turbine is less than the electric load, according to the difference between the energy captured by the wind turbine and the electric load, the water level control system of the water storage tank adjusts the water pumping pipeline valve and the sewer pipeline valve through the signal transmitted by the water level meter, so that the flow of the sewer pipeline is greater than that of the water pumping pipeline; the capacity of the seawater entering the water storage tank is smaller than the outflow capacity, and the water level in the water storage tank is gradually reduced;
when the water level monitored by the water level gauge is higher than the critical low water level, seawater flows out along a sewer pipeline, gravitational potential energy is converted into kinetic energy to push the water turbine to rotate, so that the water turbine rotating shaft drives the generator set to generate power, and the water turbine generator set control system controls the water turbine and the generator set to operate under the optimal working condition; in this case, the energy captured by the wind turbine is completely generated by the generator set, in addition, a part of generated energy is obtained by converting the gravitational potential energy of the seawater in the water storage tank, and finally, the two parts of generated energy are supplied to the user side together;
when the water level monitored by the water level gauge is lower than the critical low water level line, the water level gauge transmits a signal to the water storage tank water level control system, and the water storage tank water level control system adjusts a water pumping pipeline valve and a sewer pipeline valve through the signal transmitted by the water level gauge so as to enable the flow in the water pumping pipeline and the flow in the sewer pipeline to be equal; the capacity of the seawater entering and flowing out of the water storage tank is equal, and the water level in the water storage tank is kept unchanged; after the seawater flows out along the sewer pipe, the gravitational potential energy is converted into kinetic energy to push the water turbine to rotate, so that the generator set is driven to generate electricity through the rotating shaft of the water turbine, and the water turbine and the generator set are controlled by the water turbine generator set control system to operate under the optimal working condition; in this case, the energy captured by the wind turbine is completely generated by the generator set and then supplied to the user side, and a part of the power consumption needs to be supplied to the user side through the power grid.
The beneficial effects of the invention are mainly embodied in that:
the impeller of the wind turbine directly drives the water pump to pump water and store energy, then the water turbine generator set generates electricity, the energy storage and power generation device is combined into a whole, the power regulation reaction is fast, and real-time regulation and control are realized.
The power generation system is positioned on the fan foundation platform, so that the weight of the cabin is reduced, and a space is reserved for the arrangement of the water storage tank structure in the cabin.
The water storage tank is located in the engine room, the structure is simple, the pile foundation of the seawater water storage tank is avoided being independently arranged, and the investment cost is saved.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic view of the present invention.
Fig. 2 is a schematic view of the structure of the nacelle according to the invention.
Fig. 3 is a schematic structural diagram of the power generation system of the present invention.
FIG. 4 is a schematic diagram of the energy equivalent electrical load conversion process of the present invention.
FIG. 5 is a schematic diagram of the energy greater than electrical load conversion process of the present invention.
Fig. 6 is a schematic diagram of the energy less than electrical load conversion process of the present invention.
In the figure: sea level 1; a wind turbine foundation 2; a power generation system 3; a sewer pipe 4; a tower 5; a sewer pipe valve 6; a nacelle 7; an impeller 8; a water pumping pipeline 9; a water pumping pipeline valve 10; a seawater inlet vessel 11; a filter screen 12; a water storage tank 13; a water level gauge 14; a reservoir level control system 15; a wind turbine control system 16; a low-speed shaft 17; a gearbox 18; a high-speed shaft 19; a water pump 20; an outlet conduit 21; a water turbine 22; a water turbine rotating shaft 23; a generator set 24; hydro-turbo generator set control system 25.
Detailed Description
As shown in fig. 1 to 6, an offshore wind turbine device for pumping seawater, storing energy and generating power comprises a wind turbine foundation 2, a power generation system 3, a water storage system and a wind turbine; the power generation system 3 is positioned on the wind turbine foundation 2 and is higher than the sea level 1, the water storage tank 13 of the water storage system is higher than the power generation system 3, the water storage tank 13 converts gravitational potential energy into kinetic energy to push the water turbine 22 of the power generation system 3 to rotate, the water turbine rotating shaft 23 drives the generator set 24 to generate power, and the water turbine generator set control system 25 controls the water turbine 22 and the generator set 24 to operate; the lower end of a tower 5 of the wind turbine is connected with a foundation 2 of the wind turbine, the cabin 7 is positioned at the top of the tower 5, and the water storage tank 13 and the water pump 20 are positioned in the cabin 7. The water storage tank 13 with the structure is located in the cabin, the structure is simple, the pile foundation of the seawater water storage tank is avoided being independently arranged, and the investment cost is saved.
In a preferred scheme, the sewer pipe 4 and the water pumping pipe 9 of the power generation system 3 are positioned in the tower 5. When the wind turbine generator system is used, the power generation system 3 is located on the fan foundation platform, the weight of the cabin is reduced, and a space is reserved for the arrangement of the water storage tank structure in the cabin.
In a preferred scheme, the sewer pipe 4 is connected with the water storage tank 13 and the water turbine 22, a sewer pipe valve 6 is arranged on the sewer pipe 4, and the water outlet pipe 21 is connected with the water turbine 22. When the device is used, the impeller of the wind turbine directly drives the water pump to pump water and store energy, then the water turbine generator set generates electricity, the energy storage device and the power generation device are combined into a whole, the power regulation reaction is fast, the real-time regulation and control are convenient, and the flow of the sewer pipe 4 is regulated through the sewer pipe valve 6.
In a preferred scheme, the water pumping pipeline 9 is connected with a water pump 20 and a seawater inlet container 11, and a water pumping pipeline valve 10 is arranged on the water pumping pipeline 9. When in use, the flow of the water pumping pipeline 9 is adjusted through a water pumping pipeline valve 10.
In a preferable scheme, the water pump 20 is connected with a high-speed shaft 19 of the wind turbine, the water storage tank 13 is communicated with the water pump 20, the high-speed shaft 19 is connected with a gearbox 18, the low-speed shaft 17 is connected with the gearbox 18 and the impeller 8, and the impeller 8 is connected with a wind turbine control system 16. When the wind turbine is used, the wind turbine control system 16 ensures the operation of the wind turbine impeller 8 through torque control and yaw control, and the impeller 8 drives the water pump 20 to operate after rotating through the low-speed shaft 17, the gearbox 18 and the high-speed shaft 19.
In a preferred scheme, a filter screen 12 is arranged on the seawater inlet container 11. When the seawater filtering device is used, the filter screen 12 prevents sundries in seawater from entering the seawater inlet container 11, and pipeline blockage is avoided.
In a preferred scheme, a water level meter 14 is arranged in the water storage tank 13, and the water level meter 14 is connected with a water storage tank water level control system 15. In use, the level gauge 14 is used to monitor the water level in the reservoir 13.
In a preferred embodiment, the energy stored in the reservoir 13 is storedE=ρLWH S gH T In the formulaEIn order to be able to provide energy,ρthe density of the seawater is shown as the density of the seawater,Lin order to be the length of the reservoir,Wthe width of the water storage tank is the width of the water storage tank,H S is the height of the water storage tank,gin order to be the acceleration of the gravity,H T is the wind turbine hub height.
In a preferred scheme, when the energy captured by the wind turbine is equal to the electric load, all the energy is generated by the generator set 24 and is finally supplied to a user end; when the energy captured by the wind turbine is larger than the electricity load, if the water level in the water storage tank 13 does not exceed the critical high water level line, one part of the energy is generated by the generator set 24 and then supplied to the user side, and the rest part of the energy is stored in the water storage tank 13 in a seawater gravitational potential energy mode, if the water level in the water storage tank 13 exceeds the critical high water level line, one part of the energy is generated by the generator set 24 and then supplied to the user side, and the rest part of the energy is lost; when the energy captured by the wind turbine is smaller than the power load, if the water level in the water storage tank 13 is higher than the critical low water level line, the energy captured by the wind turbine is completely generated by the generator set 24, a part of generated energy is obtained by converting the gravitational potential energy of the seawater in the water storage tank 13, and finally the two parts of generated energy are supplied to the user side together, if the water level in the water storage tank 13 is lower than the critical low water level line, the energy is completely generated by the generator set 24 and then supplied to the user side, and in addition, part of power consumption needs to be allocated and supplied to the user side through a power grid.
In a preferred embodiment, the method for generating power by an offshore wind turbine device for pumping seawater, storing energy and generating power includes the following steps:
s1, driving, when free incoming flow passes through a wind turbine, an impeller 8 is pushed to rotate, the operation of the impeller 8 is controlled through a wind turbine control system 16, the impeller 8 drives a low-speed shaft 17 to rotate, the low-speed shaft 17 drives a gearbox 18 to drive a high-speed shaft 19 to rotate, and the high-speed shaft 19 drives a water pump 20 to operate; the wind turbine is in a working state of capturing the energy of incoming wind;
s2, storing energy, wherein after the water pump 20 runs, the seawater enters the seawater inlet container 11 after passing through the filter screen 12 and enters the water storage tank 13 along the water pumping pipeline 9 to finish energy storage; in this process, the mechanical energy of the water pump 20 is converted into the gravitational potential energy of the seawater; the flow of the water pumping pipeline 9 is adjusted through a water pumping pipeline valve 10;
s3, potential energy is used for power generation, water in the water storage tank 13 flows out through the sewer pipe 4, water in the sewer pipe 4 flows down from the cabin height, the water turbine 22 is pushed to rotate, and the water is discharged into the sea after passing through the water outlet pipe 21, so that the whole cycle is completed; in the process, the gravitational potential energy of the seawater is converted into kinetic energy;
in S3, the water turbine 22 drives the water turbine rotating shaft 23 to rotate, and the generator set 24 is driven to generate electricity;
in S3, the hydro-turbo unit control system 25 is configured to control normal operation of the water turbine 22 and the generator unit 24;
in S3, the flow of the sewer 4 is adjusted through a sewer valve 6;
in S3, a water level gauge 14 is provided in the water storage tank 13 for monitoring the water level of the water storage tank 13;
in S3, the water storage tank water level control system 15 is used to control the pumping pipeline valve 10 and the sewer pipeline valve 6, so as to adjust the water level in the water storage tank 13;
in S1, the wind turbine control system 16 ensures that the wind turbine impeller 8 operates under the optimal design working condition through torque control and yaw control, and the impeller 8 drives the water pump 20 to operate after rotating through the low-speed shaft 17, the gearbox 18 and the high-speed shaft 19;
in S1-S3, under the action of a water pump 20, seawater enters a water storage tank 13 after passing through a filter screen 12, a seawater inlet container 11 and a water pumping pipeline 9, and then flows out along a sewer pipeline 4;
in S1-S3, when the energy captured by the wind turbine is equal to the electric load;
because the energy captured by the wind turbine is equal to the electric load, the water level control system 15 of the water storage tank adjusts the water pumping pipeline valve 10 and the sewer pipeline valve 6 through signals transmitted by the water level gauge 14, so that the flow rates in the water pumping pipeline 9 and the sewer pipeline 4 are equal; the flow of seawater into and out of the reservoir 13 is equal, and the water level in the reservoir 13 remains unchanged, i.e. there is no increased storage or release of energy in the reservoir;
after the seawater flows out along the sewer pipeline 4, gravitational potential energy is converted into kinetic energy to push the water turbine 22 to rotate, so that the water turbine rotating shaft 23 drives the generator set 24 to generate electricity, and the water turbine generator set control system 25 controls the water turbine 22 and the generator set 24 to operate under the optimal working condition; in this case, the energy captured by the wind turbine is completely generated by the generator set 24 and finally supplied to the user end;
in S1-S3, when the energy captured by the wind turbine is larger than the electric load;
because the energy captured by the wind turbine is larger than the electric load, according to the difference between the energy captured by the wind turbine and the electric load, the water level control system 15 of the water storage tank adjusts the water pumping pipeline valve 10 to be larger than the outflow capacity through a signal transmitted by the water level meter 14, and the water level in the water storage tank 13 is gradually increased;
a critical high water level line is arranged in the water storage tank 13, when the water level monitored by the water level gauge 14 does not exceed the critical high water level line, the seawater flows out along the sewer pipe 4, the gravitational potential energy is converted into kinetic energy to push the water turbine 22 to rotate, so that the generator set 24 is driven to generate power through the water turbine rotating shaft 23, and the water turbine generator set control system 25 controls the water turbine 22 and the generator set 24 to operate under the optimal working condition; in this case, a part of the energy captured by the wind turbine is generated by the generator set 24 and then supplied to the user side, and the rest is stored in the water storage tank 13 in the form of seawater gravitational potential energy;
when the water level monitored by the water level gauge 14 exceeds a critical high water level line, the water level gauge 14 transmits a signal to the water storage tank water level control system 15, and the water storage tank water level control system 15 adjusts the water pumping pipeline valve 10 and the sewer pipeline valve 6 through the signal transmitted by the water level gauge 14, so that the flow rates in the water pumping pipeline 9 and the sewer pipeline 4 are equal; the volumes of seawater entering and flowing out of the water storage tank 13 are equal, and the water level in the water storage tank 13 is kept unchanged; after the seawater flows out along the sewer pipeline 4, the gravitational potential energy is converted into kinetic energy to push the water turbine 22 to rotate, and the generator set 24 is driven to generate electricity through the water turbine rotating shaft 23; meanwhile, according to the difference between the incoming flow energy and the electrical load, the water turbine generator set control system 25 controls the operation of the water turbine 22 and the generator set 24, and at the moment, the water turbine 22 and the generator set 24 do not operate under the optimal working condition; in this case, the wind turbine captures a part of the energy to generate electricity through the generator set 24 and then supplies the electricity to the user side, and the rest is lost at the water turbine 22 and the generator set 24;
in S1-S3, when the energy captured by the wind turbine is less than the electric load;
because the energy captured by the wind turbine is less than the electric load, according to the difference between the energy captured by the wind turbine and the electric load, the water level control system 15 of the water storage tank adjusts the water pumping pipeline valve 10 and the sewer pipeline valve 6 through the signal transmitted by the water level gauge 14, so that the flow of the sewer pipeline 4 is greater than that of the water pumping pipeline 9; the volume of seawater entering the water storage tank 13 is smaller than the volume of seawater flowing out, and the water level in the water storage tank 13 is gradually reduced;
a critical low water level line is arranged in the water storage tank 13, when the water level monitored by the water level gauge 14 is higher than the critical low water level line, the seawater flows out along the sewer pipe 4, the gravitational potential energy is converted into kinetic energy to push the water turbine 22 to rotate, so that the generator set 24 is driven to generate power through the water turbine rotating shaft 23, and the water turbine generator set control system 25 controls the water turbine 22 and the generator set 24 to operate under the optimal working condition; in this case, the energy captured by the wind turbine is completely generated by the generator set 24, and in addition, a part of the generated energy is obtained by converting the gravitational potential energy of the seawater in the water storage tank 13, and finally, the two generated energy are supplied to the user end together;
when the water level monitored by the water level gauge 14 is lower than the critical low water level line, the water level gauge 14 transmits a signal to the water storage tank water level control system 15, and the water storage tank water level control system 15 adjusts the water pumping pipeline valve 10 and the sewer pipeline valve 6 through the signal transmitted by the water level gauge 14, so that the flow rates in the water pumping pipeline 9 and the sewer pipeline 4 are equal; the volumes of seawater entering and exiting the water storage tank 13 are equal, and the water level in the water storage tank 13 is kept unchanged; after the seawater flows out along the sewer pipe 4, the gravitational potential energy is converted into kinetic energy to push the water turbine 22 to rotate, so that the water turbine rotating shaft 23 drives the generator set 24 to generate electricity, and the water turbine generator set control system 25 controls the water turbine 22 and the generator set 24 to operate under the optimal working condition; in this case, the energy captured by the wind turbine is entirely generated by the generator set 24 and then supplied to the customer end, and a part of the power consumption needs to be supplied to the customer end through the grid.
The embodiment is as follows:
take an NREL 5MW wind turbine with a hub height of 90m, an impeller diameter of 126m, and cut-in and cut-out wind speeds of 3m/s and 25m/s, respectively, as an example.
The size of the water storage tank 13 is 10 multiplied by 5 multiplied by 6m 3 (length x width x height), the theoretical storable energy of the reservoir 13 can be calculated by:E=ρLWH S gH T （1）；
in the formula:Eis energy;ρthe density of the seawater is shown as the density of the seawater,ρ=1050kg/m 3 (ii) a In order to be the length of the reservoir,L=10m；Wthe width of the water storage tank is the width of the water storage tank,W=5m；H S is the height of the water storage tank,H S =6m；gis the acceleration of the gravity, and the acceleration is the acceleration of the gravity,g=9.8m/s 2 ；H T for the height of the hub of the wind turbine,H T =90m. The theoretically storable energy of the water storage tank can be calculated according to the formula (1)E=77.18kW · h. The offshore wind turbine device can be configured with the energy storage capacity of 77.18 kW.h while generating power, and can effectively relieve the impact of the conventional wind turbine on a power grid due to the intermittence of the generated power.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of this invention.
Claims (4)
1. The utility model provides a take out sea water energy storage electricity generation's offshore wind turbine device which characterized by: the wind turbine comprises a wind turbine foundation (2), a power generation system (3), a water storage system and a wind turbine; the power generation system (3) is positioned on the wind turbine foundation (2) and is higher than the sea level (1), the water storage tank (13) of the water storage system is higher than the power generation system (3), the water storage tank (13) converts gravitational potential energy into kinetic energy to push the water turbine (22) of the power generation system (3) to rotate, the water turbine rotating shaft (23) drives the generator set (24) to generate power, and the water turbine generator set control system (25) controls the water turbine (22) and the generator set (24) to operate; the lower end of a tower barrel (5) of the wind turbine is connected with a wind turbine foundation (2), a cabin (7) is positioned at the top of the tower barrel (5), and a water storage tank (13) and a water pump (20) are positioned in the cabin (7);
a sewer pipeline (4) and a water pumping pipeline (9) of the power generation system (3) are positioned in the tower barrel (5);
the sewer pipeline (4) is connected with the water storage tank (13) and the water turbine (22), a sewer pipeline valve (6) is arranged on the sewer pipeline (4), and a water outlet pipeline (21) is connected with the water turbine (22);
the water pumping pipeline (9) is connected with a water pump (20) and a seawater inlet container (11), and a water pumping pipeline valve (10) is arranged on the water pumping pipeline (9);
the wind turbine is characterized in that the water pump (20) is connected with a high-speed shaft (19) of a wind turbine, the water storage tank (13) is communicated with the water pump (20), the high-speed shaft (19) is connected with a gearbox (18), a low-speed shaft (17) is connected with the gearbox (18) and an impeller (8), and the impeller (8) is connected with a control system (16) of the wind turbine;
the power generation method comprises the following steps:
s1, driving, when free incoming flow passes through a wind turbine, an impeller (8) is pushed to rotate, the operation of the impeller (8) is controlled through a wind turbine control system (16), the impeller (8) drives a low-speed shaft (17) to rotate, the low-speed shaft (17) drives a gearbox (18) to drive a high-speed shaft (19) to rotate, and the high-speed shaft (19) drives a water pump (20) to operate; in the process, the wind turbine is in a working state of capturing the energy of incoming wind;
s2, energy storage is carried out, after the water pump (20) operates, seawater enters the seawater inlet container (11) after passing through the filter screen (12) and enters the water storage tank (13) along the water pumping pipeline (9), and energy storage is finished; in the process, the mechanical energy of the water pump (20) is converted into the gravitational potential energy of the seawater; the flow of the water pumping pipeline (9) is adjusted through a water pumping pipeline valve (10);
s3, potential energy is used for power generation, water in the water storage tank (13) flows out through the sewer pipeline (4), water in the sewer pipeline (4) flows down from the height of the cabin, the water turbine (22) is pushed to rotate, and the water is discharged into the sea after passing through the water outlet pipeline (21), so that the whole cycle is completed; in the process, the gravitational potential energy of the seawater is converted into kinetic energy;
in S3, the water turbine (22) drives a water turbine rotating shaft (23) to rotate, and a generator set (24) is driven to generate electricity;
in S3, the water turbine generator set control system (25) is used for controlling the normal operation of the water turbine (22) and the generator set (24);
in S3, the flow of the sewer pipe (4) is regulated by a sewer pipe valve (6);
in S3, a water level meter (14) is arranged in the water storage tank (13) and used for monitoring the water level of the water storage tank (13);
in S3, the water storage tank water level control system (15) is used for controlling the water pumping pipeline valve (10) and the sewer pipeline valve (6) so as to adjust the water level in the water storage tank (13);
in S1, a wind turbine control system (16) ensures that a wind turbine impeller (8) operates under the optimal design working condition through torque control and yaw control, and the impeller (8) rotates and then drives a water pump (20) to operate through a low-speed shaft (17), a gearbox (18) and a high-speed shaft (19);
in S1-S3, under the action of a water pump (20), seawater enters a water storage tank (13) after passing through a filter screen (12), a seawater inlet container (11) and a water pumping pipeline (9), and then flows out along a sewer pipeline (4).
2. The offshore wind turbine device for pumping seawater for power storage and generation according to claim 1, wherein:
in S1-S3, when the energy captured by the wind turbine is equal to the electric load;
because the energy captured by the wind turbine is equal to the electric load, the water level control system (15) of the water storage tank adjusts the water pumping pipeline valve (10) and the sewer pipeline valve (6) through signals transmitted by the water level meter (14), so that the flow rates in the water pumping pipeline (9) and the sewer pipeline (4) are equal; the flow rate of the seawater entering the water storage tank (13) is equal to that of the seawater flowing out of the water storage tank (13), and the water level in the water storage tank (13) is kept unchanged, namely the water storage tank does not increase the storage or release of energy;
after the seawater flows out along the sewer pipe (4), gravitational potential energy is converted into kinetic energy to push the water turbine (22) to rotate, so that the water turbine rotating shaft (23) drives the generator set (24) to generate electricity, and the water turbine generator set control system (25) controls the water turbine (22) and the generator set (24) to operate under the optimal working condition; in this case, the energy captured by the wind turbine is entirely generated by the generator set (24) and finally supplied to the user terminal.
3. The offshore wind turbine device for pumping seawater for power storage and generation according to claim 1, wherein:
in S1-S3, when the energy captured by the wind turbine is larger than the electric load;
because the energy captured by the wind turbine is larger than the power load, according to the difference between the energy captured by the wind turbine and the power load, the water level control system (15) of the water storage tank adjusts the water pumping pipeline valve (10) to be larger than the outflow capacity through a signal transmitted by the water level meter (14), and the water level in the water storage tank (13) is gradually increased;
a critical high water level line is arranged in the water storage tank (13), when the water level monitored by the water level meter (14) does not exceed the critical high water level line, the seawater flows out along the sewer pipeline (4), the gravitational potential energy is converted into kinetic energy to push the water turbine (22) to rotate, so that the generator set (24) is driven to generate power through the water turbine rotating shaft (23), and the water turbine generator set control system (25) controls the water turbine (22) and the generator set (24) to operate under the optimal working condition; in the condition, a part of the energy captured by the wind turbine is used for generating power through a generator set (24) and then is supplied to a user end, and the rest part of the energy is stored in a water storage tank (13) in a seawater gravitational potential energy mode;
when the water level monitored by the water level gauge (14) exceeds a critical high water level line, the water level gauge (14) transmits a signal to the water storage tank water level control system (15), and the water storage tank water level control system (15) adjusts the water pumping pipeline valve (10) and the sewer pipeline valve (6) through the signal transmitted by the water level gauge (14) so that the flow rates in the water pumping pipeline (9) and the sewer pipeline (4) are equal; the volumes of seawater entering and flowing out of the water storage tank (13) are equal, and the water level in the water storage tank (13) is kept unchanged; after the seawater flows out along the sewer pipe (4), the gravitational potential energy is converted into kinetic energy to push the water turbine (22) to rotate, and the generator set (24) is driven to generate electricity through the water turbine rotating shaft (23); meanwhile, according to the difference between the incoming flow energy and the electrical load, the water turbine generator set control system (25) controls the operation of the water turbine (22) and the generator set (24), and at the moment, the water turbine (22) and the generator set (24) do not operate under the optimal working condition; in this case, the wind turbine captures a part of the energy, which is generated by the generator set (24) and then supplied to the user side, and the remaining part is lost at the turbine (22) and the generator set (24).
4. The offshore wind turbine device for pumping seawater for power storage and generation according to claim 1, wherein:
in S1-S3, when the energy captured by the wind turbine is less than the electric load;
because the energy captured by the wind turbine is less than the electric load, according to the difference between the energy captured by the wind turbine and the electric load, the water level control system (15) of the water storage tank adjusts the water pumping pipeline valve (10) and the sewer pipeline valve (6) through signals transmitted by the water level gauge (14), so that the flow of the sewer pipeline (4) is greater than that of the water pumping pipeline (9); the volume of seawater entering the water storage tank (13) is smaller than the volume of seawater flowing out, and the water level in the water storage tank (13) is gradually reduced;
a critical low water level line is arranged in the water storage tank (13), when the water level monitored by the water level meter (14) is higher than the critical low water level line, seawater flows out along the sewer pipeline (4), gravitational potential energy is converted into kinetic energy to push the water turbine (22) to rotate, so that the water turbine rotating shaft (23) drives the generator set (24) to generate electricity, and the water turbine generator set control system (25) controls the water turbine (22) and the generator set (24) to operate under the optimal working condition; in the situation, all the energy captured by the wind turbine is used for generating electricity through the generator set (24), in addition, a part of generated energy is obtained through the conversion of the gravitational potential energy of the seawater in the water storage tank (13), and finally, the two parts of generated energy are supplied to the user side together;
when the water level monitored by the water level meter (14) is lower than the critical low water level line, the water level meter (14) transmits a signal to the water storage tank water level control system (15), and the water storage tank water level control system (15) adjusts the water pumping pipeline valve (10) and the sewer pipeline valve (6) through the signal transmitted by the water level meter (14) so that the flow rates in the water pumping pipeline (9) and the sewer pipeline (4) are equal; the volumes of seawater entering and flowing out of the water storage tank (13) are equal, and the water level in the water storage tank (13) is kept unchanged; after the seawater flows out along the sewer pipe (4), gravitational potential energy is converted into kinetic energy to push the water turbine (22) to rotate, so that the water turbine rotating shaft (23) drives the generator set (24) to generate electricity, and the water turbine generator set control system (25) controls the water turbine (22) and the generator set (24) to operate under the optimal working condition; in this case, the energy captured by the wind turbine is entirely generated by the generator set (24) and then supplied to the customer side, and a part of the power consumption needs to be distributed and supplied to the customer side through the power grid.
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