CN106837669B - Offshore wind, electric wave and wave energy balance system - Google Patents
Offshore wind, electric wave and wave energy balance system Download PDFInfo
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- CN106837669B CN106837669B CN201710107061.1A CN201710107061A CN106837669B CN 106837669 B CN106837669 B CN 106837669B CN 201710107061 A CN201710107061 A CN 201710107061A CN 106837669 B CN106837669 B CN 106837669B
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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
- F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
- F03B13/14—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy
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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
- F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
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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
- Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/727—Offshore wind turbines
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- Combustion & Propulsion (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
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Abstract
The invention discloses a novel offshore wind, wave and wave energy balance system which adopts wind energy, wave energy and compressed air multi-energy mixed active and passive adjustment of tower balance. The wind power generation device comprises a wind power platform floating body, a wave energy pitching ellipsoid, a compressed air energy storage and a central control unit. The wind power platform floating body comprises a main floating body, a floating body support and a balance floating barrel, wherein the main floating body provides main buoyancy support for offshore wind power, the balance floating barrel passively generates balance torque, a wave energy pitching ellipsoid actively generates the balance torque to cooperate with regulation and control of tower frame balance, and pitching captures wave energy; the compressed air energy storage device comprises a pitching ellipsoid regulation and control device, a high-pressure air tank and an air tank pressure stabilizing mechanism, and regulates and controls the working state of the wave energy pitching ellipsoid; the central control unit decides a platform balance state and a wave energy capturing state based on wind speed, waves and a platform side elevation angle, and the integral stability of the system is realized. The invention effectively improves the stability and the mobility of the offshore wind power system, greatly reduces the cost and promotes the large-scale application of offshore wind power.
Description
Technical Field
The invention relates to an offshore wind wave energy balancing system, in particular to a multi-energy hybrid tower platform stability regulating and controlling system applied to large and medium offshore wind power, which ensures the stability of an offshore wind power generation system.
Background
Wind power generation is a clean renewable energy source with wide development prospect, and is an energy development strategy of all countries in the world. The traditional offshore wind power tower is directly constructed on the seabed, but the high salinity of seawater and the wave and tidal motion of the seawater easily cause corrosion and impact distortion of the tower, meanwhile, the overturning moment generated by blades of a wind motor easily causes the tower to turn sideways, the service life of the tower is seriously influenced, and the tower is arranged on the seabed, so that the installation, manufacturing and maintenance costs of a wind power system are increased, and the development of offshore wind power is seriously restricted. In recent years, a novel offshore wind power generation by delivery based on floating base, it uses floating base as fan tower foundation, it is stable to have realized wind power system tower, offshore wind power installation cost has been reduced, but floating base introduces and makes offshore wind power system focus too high, easily receive the interference of fluctuation wind speed and wave, system balance nature and stability are relatively poor, the control degree of difficulty increases and very easily leads to toppling and turning on one's side of wind power system, platform stability control still needs the fan to send the electric energy and adjusts simultaneously, wind power system's generated power has greatly been reduced. The ocean wave energy is strictly pollution-free and large in content capacity, and has the advantage of natural coupling with offshore wind power, 201210030258.7 discloses a prestressed concrete floating platform for supporting an offshore wind turbine and an offshore wind power generator, a tower is stably realized by regulating and controlling the water quality of a buoy through a water pump, the water pump supplies power from horizontal axis wind power generation and vertical axis wind power generation, and the concept of photovoltaic power generation and wave energy power generation is provided.
Disclosure of Invention
The technical task of the invention is to provide an offshore wind wave energy balancing system aiming at the defects in the technology.
The technical scheme adopted by the invention for solving the technical problems is as follows: the offshore wind, wave and wave energy balance system adopts hybrid energy storage modes of wind energy, wave energy, compressed energy storage and the like, active and passive hybrid adjustment towers are balanced to ensure the stability of an offshore wind power platform, the offshore wind, wave and wave energy balance system comprises a wind power platform floating body, a wave energy pitching ellipsoid, a compressed air energy storage and a central control unit, hybrid energy storage modes of wind energy, wave energy, compressed energy storage and the like are adopted, and active and passive hybrid adjustment towers are balanced to ensure the stability of an offshore wind power generation system; the wind power platform floating body comprises a main floating body, floating body supports and balance floating bodies which are symmetrically arranged, the main floating body provides buoyancy support for the wind power platform, the balance floating bodies are rigidly connected with the main floating body through the floating body supports, and the balance of the tower frame is passively adjusted; the wave energy pitching ellipsoid captures wave energy and actively adjusts the balance of the tower; the compressed air energy storage device is a regulating device and an energy conversion structure of a wave energy pitching ellipsoid and comprises a pitching ellipsoid regulating device, a high-pressure air tank and an air tank pressure stabilizing mechanism, and the wave energy balancing floating ball is controlled to operate in three states of maximum capture, limited capture and passive capture; the central control unit is a DSP28335CPU data acquisition and control panel, acquires data such as wind speed, wave height, wave speed, platform side elevation angle and the like in real time, decides a platform balance state and regulates and controls a wave energy pitching ellipsoid capturing state.
The offshore platform comprises a main floating body, floating body supports and 4 symmetrically arranged balance floating barrels, wherein the main floating body is in a barrel shape and is concentrically and rigidly connected with a tower frame to provide buoyancy support for the floating body of the wind power platform, a high-pressure gas tank, an expander, a generator and a current transformer are sequentially placed inside the offshore platform from top to bottom to enable the gravity center of the wind power system to be kept below the sea level, the offshore platform randomly tilts up along with the wind power system, the infiltration volume changes to generate follow-up restoring moment, and the wind power platform side elevation angle is regulated and controlled in a follow-up mode by combining the wind power platform floating body gravity moment.
The balance buoys are barrel-shaped, are symmetrically distributed around the main floating body, are in rigid connection with the main floating body through floating body support, are internally provided with partial structures for storing energy by compressed air, randomly incline the wind power platform, generate difference infiltration volume between the buoys, and convert the balance restoring moment into a passive balance wind power platform rollover moment through floating body support.
The wave energy pitching ellipsoids are 4 ellipsoidal floating bodies and are connected with the pitching center shaft in a U-shaped mode, pitching motion is carried out around the pitching center shaft in seawater, the central control unit independently decides the running state of the wave energy pitching ellipsoids according to data such as wind speed, waves and platform side elevation angles, the pitching frequency and the angle of the wave energy ellipsoid floating bodies are controlled by regulating and controlling the working state of compressed air energy storage under the condition that the main floating body and the balance floating bodies of the wind power platform are pitching base points, pitching moment is generated, and the wind power platform is regulated and controlled to be stable in a driving and driven mode by combining with the passive restoring moment of the wind power platform floating body.
The compressed air energy storage device comprises a pitching ellipsoid regulation and control device, a high-pressure air tank and an air tank pressure stabilizing mechanism, and the wave energy pitching ellipsoids are controlled to respectively operate in three states of maximum capture, limited capture and passive capture, so that mutual conversion and storage among wave energy, wind energy, electric energy and compressed energy storage are realized. The wave energy pitching ellipsoid regulation and control device comprises a pitching transmission device, a crank connecting rod, a compression cylinder, a piston, a low-pressure servo valve and a high-pressure servo valve, the wave energy pitching ellipsoid capturing state is regulated and controlled according to the platform balance state decided by the central control unit, high-pressure gas in the high-pressure gas tank is driven by the high-pressure gas circuit to move under the control of the high/low-pressure servo valve, and the crank connecting rod and the pitching transmission device are used for carrying out torque conversion, speed regulation and direction regulation to control the working state of the wave energy pitching ellipsoid. The gas tank pressure stabilizing mechanism comprises an expander and a generator which are coaxially connected, the expander has the functions of compression and expansion multiplexing, and the generator has the functions of electric driving and power generation multiplexing; when the air pressure of the high-pressure air tank is reduced to the air pressure lower limit, the expander operates in a compressor state and is driven by the generator operating in an electric state, compressed air is stored in the high-pressure air tank, and the air pressure of the air tank is maintained to be stable.
The central control unit is a DSP28335CPU data acquisition and control panel, acquires data such as wind speed, wave height, wave speed, platform side elevation angle and the like in real time, decides a platform balance state, controls a high/low pressure valve, changes the air pressure difference of two sides of a piston, and regulates and controls the wave energy pitching ellipsoid capture state.
The invention has the following beneficial effects:
1) The invention provides a tower support platform for offshore wind power generation by virtue of the platform floating body, the active and passive regulation and control platform stably and effectively enhances the stability of the offshore wind power system, reduces the manufacturing, installation and maintenance cost, improves the service life of the tower, improves the mobility of the offshore wind power system and is convenient for movable installation and maintenance.
2) According to the invention, the wind power platform is actively regulated and controlled to be stable by adopting wave energy, the buoyancy and distribution around the platform are regulated while the wave energy is captured by utilizing 4 wave energy pitching ellipsoids, the tower stability is actively and passively regulated together with the main floating body and the balance buoy of the wind power platform, the stability regulation and control freedom degree of the tower is greatly enhanced, and the power generation stability of the offshore wind power system is improved.
3) The invention stores the captured wave energy in the high-pressure air tank in the form of compressed air by means of compressed air energy storage, actively regulates and controls the working state of the wave energy pitching ellipsoid, realizes the multi-energy mixing and multi-directional utilization of the wave energy, the wind energy and the compressed air energy storage, and greatly improves the energy utilization rate.
Drawings
Fig. 1 is a front view of an offshore wind power wave energy balance system.
Fig. 2 is a top view of an offshore wind wave energy balancing system.
Fig. 3 is a view of the internal structure of the balance buoy. (structure diagram of compressed air energy storage in balance buoy shown in figure 3)
FIG. 4 is a regulatory device structure.
Figure 5 work flow diagram.
In the figure, 1, a fan, 2, a tower, 3, a high-pressure gas tank, 4, a floating body support, 5, a balance buoy, 6, a high-pressure servo valve, 7, an expansion servo valve, 8, a generator, 9, a main floating body, 10, a wave energy pitching ellipsoid, 11, a compression cylinder, 12, a high-pressure gas circuit, 13, an expander, 14, a converter, 15, a pitching middle shaft, 16, a crank middle shaft, 17, a buoy inner support, 18, a middle shaft helical gear, 19, a crank long arm, 20, a low-pressure servo valve, 21, a crank short arm, 22, a crank helical gear, 23 and a piston.
Detailed Description
Description of variables:
θ min : a lower limit value of a platform side elevation angle;
θ max : an upper limit value of a platform side elevation angle;
P min : the lower limit value of the air pressure of the high-pressure air tank;
P max : the upper limit value of the air pressure of the high-pressure air tank;
the invention is further illustrated with reference to the following figures and examples.
The invention discloses an offshore wind, wave and wave energy balance system, which comprises a wind power platform floating body, a wave energy pitching ellipsoid 10, a compressed air energy storage unit and a central control unit, wherein the wind power platform floating body is connected with the wave energy pitching ellipsoid; the floating body of the wind power platform consists of a main floating body 9, a floating body support 4 and 4 symmetrically arranged balance floating bodies 5; the compressed air energy storage device consists of a pitching ellipsoid regulation and control device, a high-pressure air tank 3 and an air tank pressure stabilizing mechanism, the pitching ellipsoid regulation and control device consists of a pitching transmission device, a crank connecting rod, a compression cylinder 11 and a piston 23, the air tank pressure stabilizing mechanism consists of an expansion machine 13 and a generator 8, the pitching transmission device consists of a pitching middle shaft 15, a middle shaft helical gear 18 and a crank helical gear 22, and the crank connecting rod consists of a crank middle shaft 16, a crank short arm 21 and a crank long arm 19; the central control unit consists of a DSP28335CPU data acquisition and control panel.
The working process of the offshore wind, wave and wave energy balance system disclosed by the invention is shown in fig. 4, and the central control unit decides the balance state of the wind power platform and the working mode of the gas tank pressure stabilizing mechanism according to the real-time monitored wind speed, wave height, wave speed, platform side elevation angle, historical data and the like, regulates and controls the opening degrees of the high/low pressure servo valves (20 and 6) and the expansion servo valve 7, and cooperatively stabilizes the balance of the tower 2 and the air pressure of the high-pressure gas tank 3. The offshore wind power system can work to capture a passive balance state to the maximum extent, capture an active and passive balance state to the limited extent and capture the active and passive balance state indirectly, infiltration volume changes are generated between the main floating body 9 and the balance buoy 5 along with the side pitching of the wind power system, and the balance of the tower 2 is passively adjusted; the wave energy pitching ellipsoid 10 actively generates a balance moment to regulate and control the platform to be stable under the driving and control of compressed air energy storage; the state of capturing wave energy by the wave energy pitch ellipsoids 10 in active regulation can be divided into maximum capture, limited capture and passive capture, when the wave energy pitch ellipsoids 10 operate in the maximum capture state, wave energy is captured to the maximum extent, and at the moment, the main floating body 9 and the balance buoy 5 passively adjust the stable platform by the side pitching moment generated in the capturing process of the external and captured wave energy; when the wave energy pitching ellipsoids 10 operate in a limited capture state, the wave energy pitching ellipsoids 10 capture wave energy, and simultaneously reduce the influence on the platform stability as much as possible, so as to ensure the platform stability; when the wave energy pitch ellipsoid 10 operates in a passive capture state, the wave energy pitch ellipsoid 10 passively captures wave energy while actively adjusting the balance of the tower 2 under the indirect control of the central control unit. The gas tank pressure stabilizing mechanism can work in an electric boosting mode, a stopping maintaining mode and a power generation voltage reduction mode, the tower 2 is actively and passively adjusted to be balanced, and the gas pressure of the high-pressure gas tank 3 is stable.
The central control unit firstly collects data such as wind speed, wave height, wave speed, platform side elevation angle and high-pressure gas tank pressure intensity, and determines the working state of the gas tank pressure stabilizing mechanism in a platform balance state according to the platform side elevation angle and the high-pressure gas tank pressure intensity:
1) Wind power platform steady state determination
(1) When the platform side elevation angle is smaller than the lower limit of the platform side elevation angle (theta < theta) min ) The platform operates in a passive equilibrium state;
(2) when the platform side elevation angle is between the upper and lower limits of the platform side elevation angle (theta) min ＜θ＜θ max ) The platform runs in an active part balance state;
(3) when the platform side elevation angle is larger than the upper limit of the platform side elevation angle (theta > theta) max ) And the platform runs in an active and passive mixed equilibrium state.
2) Tank pressure stabilization mechanism mode determination
(1) When the air pressure of the high-pressure air tank is less than the air pressure lower limit (P < P) min ) The air tank pressure stabilizing mechanism works in an electric boosting mode;
(2) when the air pressure of the high-pressure air tank is between the upper limit and the lower limit of the air pressure (P) min ＜P＜P max ) The gas tank pressure stabilizing mechanism works in a stop keeping mode;
(3) when the air pressure of the high-pressure air tank is greater than the upper limit of the air pressure (P is greater than P) max ) And the gas tank pressure stabilizing mechanism works in a power generation pressure reduction mode.
Maximum capture passive equilibrium state: when the elevation angle of the platform side is smaller than the lower limit of the elevation angle of the platform side, four wave energy pitching ellipsoids 10 symmetrically distributed on the periphery of the main floating body 9 independently operate, each wave energy pitching ellipsoid 10 works in a maximum power capture state, optimal pitching frequency tracking control is respectively carried out on the wave energy pitching ellipsoids 10 based on the surrounding wave conditions, the wave energy pitching ellipsoids 10 do pitching motion, the piston 23 in the compression cylinder 11 is driven to move up and down through the transmission of a pitching transmission device and the conversion of a crank connecting rod, the wave energy is stored in the high-pressure gas tank 3 in a compressed air mode, the gas tank pressure stabilizing mechanism operates in a shutdown state, when the gas pressure of the gas tank is larger than the upper limit of the gas pressure, the gas tank pressure stabilizing mechanism operates in an expansion power generation state, the high-pressure gas controls the flow through the expansion servo valve 7, and the expansion machine 13 expands and releases energy to drive the generator 8 to generate power, so that the gas pressure in the high-pressure gas tank 3 is stable. The wave energy pitching ellipsoid 10 captures wave energy to the maximum extent and affects the stability of the platform to cause side elevation angle change, the main floating body 9 is used for bearing downward pressure in the vertical direction of the wind power system and buoyancy support of gravity, and meanwhile, under the action of a side pitching angle of the platform, the infiltration volume changes to generate follow-up difference buoyancy moment, and the wind power platform side elevation angle is regulated and controlled in a follow-up mode by combining the main floating body gravity moment of the wind power platform; in addition, the change of the side elevation angle causes the change of the infiltration volume of 4 symmetrically distributed balance buoys 5, the buoyancy distribution of the wind power platform is passively changed, so that the buoyancy of each balance buoy 5 is changed, pitching moment is generated to passively regulate the side elevation angle of the wind power platform, and the change of the side elevation angle of the platform caused by the fact that the pitching ellipsoid captures wave energy to the maximum is compensated.
Limited capture active passive equilibrium state: when the platform side elevation angle is between the lower limit and the upper limit of the platform side elevation angle, the system operates in a limited capture active and passive balance state, and the gravity moment of the main floating body 9 and the balance buoys 5 and the difference buoyancy moment between the 4 balance buoys passively regulate and control the platform side elevation; the central control unit provides pitch angle frequencies of 4 wave energy capturing ellipsoids 9 according to a platform side elevation angle measured in real time and a wave working condition, controls a piston 23 to do linear motion in a compression cylinder 11 in a coordinated manner through high/low pressure servo valves (6 and 20), changes the pitching motion of the wave energy capturing ellipsoids 10 through a crank connecting rod and a pitching transmission device, enables the pitching frequency of the wave energy capturing ellipsoids 10 to deviate from the wave frequency, generates respective acting force, converts the acting force into balance moment through a floating body support 4, actively compensates passive moment generated by a main floating body 9 and a balance buoy 5, and cooperatively completes the stability of the platform; at the moment, 4 wave energy pitching ellipsoids 10 deviate from the wave frequency, under the condition that the stability of the platform is ensured, wave energy is stored into the high-pressure gas tank 3 in the form of compressed gas, the gas tank pressure stabilizing mechanism can work in a power generation pressure reduction mode, an electric boosting mode and a stop keeping mode under the regulation and control of the central control unit, and under the synergistic action of the expansion servo valve 7 and the converter 14, the running states of the expander 13 and the generator 8 are dynamically changed, so that the relative stability of the gas pressure in the high-pressure gas tank 3 is maintained.
Indirectly capturing the active and passive equilibrium states: when the elevation angle of the platform side is larger than the upper limit of the elevation angle of the platform side, the system operates in an indirect capture active and passive balance state, the main floating body 9 and the balance floating barrels 5 passively change the infiltration volume of 4 balance floating barrels 5 under the action of the larger elevation angle of the platform side, then the buoyancy of the 4 balance floating barrels 5 changes, differential buoyancy torque is generated under the supporting action of the floating bodies, the elevation angle of the platform side is passively adjusted, the central control unit provides the pitch angles of 4 wave energy pitching ellipsoids 10 according to the real-time measured elevation angle of the platform side and the wave working condition, the air pressure in the compression cylinder 11 is adjusted and changed through the high/low pressure servo valves (6 and 20), the piston 23 is driven to linearly move, the pitch angles of the 4 wave energy pitching ellipsoids 10 are actively changed through the crank connecting rod and the pitch transmission device, the effective infiltration volume and the buoyancy distribution of the 4 ellipsoid floating bodies are changed, and the balance torque of the platform is generated, and the platform is ensured to be stable. At the moment, the wave energy pitching ellipsoids 10 operate in a non-capture state, when the air pressure of the air tank is lower than the air pressure lower limit, the air tank pressure stabilizing mechanism operates in an electric pressurization state, the generator 8 operates in an electric state, the compressor 13 is driven to compress air, high-pressure gas is stored in the high-pressure air tank 3 under the control of the expansion servo valve 7, and power is provided for balance adjustment of the wave energy pitching ellipsoids 10.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (2)
1. An offshore wind, wave and wave energy balance system applied to large and medium offshore wind power generation is characterized by comprising a wind power platform floating body, a wave energy pitching ellipsoid, a compressed air energy storage and a central control unit, wherein wind energy, wave energy and compressed energy storage are adopted, and a tower frame is adjusted to be balanced in an active and passive mixed mode, so that the stability of an offshore wind power generation system is ensured; the wind power platform floating body comprises a main floating body, floating body supports and balance floating bodies which are symmetrically arranged, the main floating body provides buoyancy support for the wind power platform, the balance floating bodies are rigidly connected with the main floating body through the floating body supports, and the balance of the tower frame is passively adjusted; the wave energy pitching ellipsoid captures wave energy and actively adjusts the balance of the tower; the compressed air energy storage device is a regulating device for a wave energy pitching ellipsoid and an energy conversion structure, and comprises a pitching ellipsoid regulating device, a high-pressure air tank and an air tank pressure stabilizing mechanism; the central control unit is a DSP28335CPU data acquisition and control panel, and is used for acquiring wind speed, wave height, wave speed, platform side elevation, decision-making platform balance state and regulating and controlling wave energy pitching ellipsoid capture state in real time; the wind power platform floating body is cylindrical and is in concentric rigid connection with the tower frame to support the vertical downward pressure of the wind power platform, a high-pressure gas tank, an expander, a generator and a converter are arranged in the wind power platform floating body, the gravity center of the wind power platform is forced to move downwards below the sea level, the random side elevation of the wind power platform leads to the infiltration volume change of the main floating body, recovery moment is generated in a follow-up mode, resultant moment is formed by the random side elevation of the wind power platform floating body and the gravity moment of the wind power platform, and the side elevation of the wind power platform is regulated; the balance buoys are drums symmetrically distributed around the main floating body, a part of compressed air energy storage structures are arranged in the drums, 4 balance buoys generate differential infiltration volume along with wind power side elevation, balance recovery moment is passively generated through floating body support, and the wind power platform side turnover moment is balanced; the wave energy pitching ellipsoids are 4 ellipsoidal floating bodies and are connected with the pitching center shaft in a U-shaped mode, pitching motion is carried out around the pitching center shaft in seawater, the 4 pitching ellipsoids are independently controlled respectively, the running state of the wave energy pitching ellipsoids is decided according to wind speed, waves and platform side elevation angles, a main floating body of the wind power platform and the balance buoy provide reference points for the pitching motion of the wave energy pitching ellipsoids, the pitching speeds and angles of the wave energy ellipsoid floating bodies are regulated and controlled by piston motion to generate different pitching moments, the passive recovery moments of the main floating body and the balance buoy are actively compensated, and the wind power platform is regulated and controlled to be stable; the pitch ellipsoid regulating and controlling device comprises a pitch transmission device, a crank connecting rod, a compression cylinder, a piston, a low-pressure servo valve and a high-pressure servo valve, the pitch ellipsoid regulating and controlling device is fixed in the balance buoy through a buoy inner support, the central control unit regulates and controls the valve opening degree of the high/low-pressure servo valve, changes the gas pressure difference on two sides of the piston, drives the piston to linearly move in the compression cylinder, drives the crank connecting rod and the pitch transmission device to rotate, drives the wave energy pitch ellipsoid to do pitch motion, and actively regulates and controls the stability of the wind power platform; the pitching transmission device comprises a pitching middle shaft, a middle shaft bevel gear and a crank bevel gear, and the pitching motion of the wave energy pitching ellipsoid is converted into the rotation motion of the crank middle shaft through reversing speed regulation; the crank connecting rod comprises a crank middle shaft, a crank short arm and a crank long arm, and the rotary motion of the crank middle shaft is converted into high-speed linear motion of the piston through direction and speed regulation.
2. The offshore wind wave energy balancing system according to claim 1, wherein the tank pressure stabilizing mechanism comprises an expander and a generator which are coaxially connected, the expander has a compression and expansion multiplexing function, and the generator has an electric and power generation multiplexing function; the expander expands when the air pressure of the high-pressure air tank exceeds the limit to release energy, the air flow is regulated and controlled through the expansion servo valve to drive the generator to generate electricity, the air pressure of the high-pressure air tank is reduced, when the air pressure of the high-pressure air tank is reduced to the air pressure limit, the expander runs in a compressor state and is driven by the generator running in an electric state, compressed air is stored in the high-pressure air tank, and the air pressure of the air tank is maintained to be stable.
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|---|---|---|---|---|
| CN107559146A (en) * | 2017-10-12 | 2018-01-09 | 华能国际电力股份有限公司 | A kind of offshore wind power system with seabed compressed-air energy storage |
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