CN110578769A - Self-protection system and self-protection method of wave energy power generation device in extreme marine environment - Google Patents
Self-protection system and self-protection method of wave energy power generation device in extreme marine environment Download PDFInfo
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- CN110578769A CN110578769A CN201910830766.5A CN201910830766A CN110578769A CN 110578769 A CN110578769 A CN 110578769A CN 201910830766 A CN201910830766 A CN 201910830766A CN 110578769 A CN110578769 A CN 110578769A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
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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
- 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
- F03B13/16—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 using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem"
- F03B13/18—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 using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/28—Counterweights, i.e. additional weights counterbalancing inertia forces induced by the reciprocating movement of masses in the system, e.g. of pistons attached to an engine crankshaft; Attaching or mounting same
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
- B63B2035/442—Spar-type semi-submersible structures, i.e. shaped as single slender, e.g. substantially cylindrical or trussed vertical bodies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
- B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
- B63B2035/4433—Floating structures carrying electric power plants
- B63B2035/4466—Floating structures carrying electric power plants for converting water energy into electric energy, e.g. from tidal flows, waves or currents
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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
- F05B2240/00—Components
- F05B2240/90—Mounting on supporting structures or systems
- F05B2240/95—Mounting on supporting structures or systems offshore
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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
- F05B2260/00—Function
- F05B2260/96—Preventing, counteracting or reducing vibration or noise
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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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- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- Physics & Mathematics (AREA)
- Aviation & Aerospace Engineering (AREA)
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- Ocean & Marine Engineering (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
The invention discloses a self-protection system and a self-protection method of a wave energy power generation device in an extreme marine environment, wherein the self-protection system comprises two cylindrical rigid guide columns, the bottoms of the two cylindrical rigid guide columns are deeply buried in the sea bottom, the tops of the two cylindrical rigid guide columns are exposed out of the sea surface, a working platform lifting device is installed at the top ends of the guide columns, a working platform is installed at the top ends of the working platform lifting device, a controller, a single chip microcomputer, an electromagnetic relay and a storage battery are installed in the working platform, a vibration absorption block lifting device is installed at the top of the working platform, and a vibration absorption block is installed at the top of the vibration absorption. The self-protecting system and the self-protecting method disclosed by the invention utilize the principle of a dynamic vibration absorber to transfer the violent vibration of the floater and the working platform under extreme sea conditions to the vibration absorber fixedly connected with the working platform, so that the acting force of the vibration absorber on the working platform and the floater just balances the wave force directly borne by the working platform and the floater, namely the vibration energy of the floater and the working platform is absorbed by the vibration absorber, and the aim of reducing the violent vibration of the floater and the working platform is fulfilled.
Description
Technical Field
The invention belongs to the field of wave energy power generation devices, and particularly relates to a self-protection system and a self-protection method of a wave energy power generation device in an extreme marine environment in the field.
background
When the offshore type oscillating floater wave energy power generation device encounters extreme severe sea conditions, the floater and the working platform of the offshore type oscillating floater wave energy power generation device are subjected to huge storm impact, the floater structure is possibly damaged, the working platform is possibly unstably and overturned due to overlarge amplitude, and the service life and the working performance of the wave energy power generation device are seriously influenced. Therefore, it is necessary to make the wave energy power generation device capable of judging its own vibration condition in time when facing extreme severe sea conditions and automatically and effectively making self-protection measures, but most of the existing wave energy power generation devices do not have self-protection function, and when the extreme severe sea conditions occur, some electric devices and floats on the working platform of the wave energy power generation device are often destroyed because they cannot be protected in time.
Disclosure of Invention
The invention aims to provide a self-protection system and a self-protection method of a wave energy power generation device in an extreme marine environment.
The invention adopts the following technical scheme:
In a self-sustaining system for a wave energy power plant in an extreme marine environment, the improvement comprising: the self-protection system comprises two cylindrical rigid guide columns, wherein the bottoms of the two cylindrical rigid guide columns are deeply embedded in the sea bottom, the tops of the two cylindrical rigid guide columns are exposed out of the sea surface, a working platform lifting device is installed at the top ends of the guide columns, a working platform is installed at the top end of the working platform lifting device, a controller, a single chip microcomputer, an electromagnetic relay and a storage battery are installed inside the working platform, a vibration absorption block lifting device is installed at the top of the working platform, a vibration absorption block is installed at the top of the vibration absorption block lifting device, a cylindrical floater penetrates through the two guide columns, floats on the sea surface and can slide up and down along the two guide columns, an iron block is installed at the position, right facing the electromagnetic relay, of the top of the cylindrical floater, a power generation system and a vibration sensor are installed in the cylindrical floater, the single chip microcomputer is respectively electrically connected with the vibration sensor, the controller and the electromagnetic relay, and the single chip microcomputer controls The power output end of the power generation system is electrically connected with the storage battery, and the storage battery supplies power to all parts in the self-protection system.
further, the working platform is fixedly installed at the top end of the working platform lifting device in a welding mode.
Furthermore, the bottom of the working platform lifting device is embedded and fixed at the top of the guide post; the vibration absorption block lifting device is embedded, welded and installed inside the working platform.
Furthermore, the vibration absorption block is a mass block with large density and small volume.
Furthermore, a circular groove is formed in the position, right opposite to the electromagnetic relay, of the bottom of the working platform, and the iron block is a circular iron block.
furthermore, the working platform lifting device and the vibration absorption block lifting device are telescopic tension and compression rods.
In a method of self-sustaining wave energy power generation in extreme marine environments, using the self-sustaining system described above, the improvement comprising the steps of:
(1) The vibration sensor senses the vibration displacement amplitude of the cylindrical floater in real time and transmits the vibration displacement amplitude to the single chip microcomputer, and the single chip microcomputer carries out real-time, comprehensive and multifunctional intelligent processing on sensed data;
(21) Under normal sea conditions, the vibration displacement amplitude is within a preset safety range, the cylindrical floater does vertical oscillation motion along with waves to drive a power generation system inside the cylindrical floater to generate power, and the power generated by the power generation system can be output to a storage battery for storage;
(22) Under extreme sea conditions, the vibration displacement amplitude exceeds a preset safety transition range, the single chip microcomputer controls the vibration absorption block lifting device to drive the vibration absorption block to ascend through the controller, the ascending height is adjusted in real time through the single chip microcomputer according to the vibration displacement amplitude, the single chip microcomputer is also connected with the electromagnetic relay and controls the working platform lifting device to descend through the controller until the magnetic force of the electromagnetic relay attracts the iron block to attract the cylindrical floater to the bottom of the working platform, at the moment, the cylindrical floater and the working platform form a whole, and the vibration absorption block adjusts the displacement amplitude of the whole within the safety transition range;
(221) When the sea surface returns to the normal sea condition, and the vibration displacement amplitude is reduced to the preset safety range again, the single chip microcomputer controls the vibration absorption block lifting device through the controller to drive the vibration absorption block to fall to the initial position, the single chip microcomputer also disconnects the electromagnetic relay and controls the working platform lifting device to rise to the initial position through the controller, after the electromagnetic relay is disconnected, the magnetic force disappears, the cylindrical floater falls back to the sea surface again, and the cylindrical floater continues to swing along with the waves to generate electricity.
Further, in the step (1), the vibration sensor senses the vibration displacement amplitude of the cylindrical floater in real time, and the singlechip is used for sensing the vibration displacement amplitude according to a general motion equation X of the vibration displacementmsin2 π ft to determine the vibration displacement X, XmRepresenting the vibration displacement amplitude, f representing the vibration frequency.
Further, the safe range of the vibration displacement amplitude of the cylindrical floater can be set to be 0-0.3m, the safe transition range can be set to be 0.3-0.5m, and parameter ranges can be set according to specific environments under the actual sea condition of different wave energy power generation devices.
the invention has the beneficial effects that:
The self-protecting system and the self-protecting method disclosed by the invention utilize the principle of a dynamic vibration absorber to transfer the violent vibration of the floater and the working platform under an extreme sea condition to the vibration absorber fixedly connected with the working platform, so that the acting force of the vibration absorber on the working platform and the floater just balances the wave force directly borne by the working platform and the floater, namely the vibration energy of the floater and the working platform is absorbed by the vibration absorber, thereby achieving the purpose of reducing the violent vibration of the floater and the working platform, avoiding the overturning of the working platform under the severe sea condition, and simultaneously utilizing the magnetic force to absorb the cylindrical floater to the bottom of the working platform, reducing the violent vibration of the cylindrical floater and protecting the self structure from being damaged. Therefore, the wave energy power generation device is timely and effectively protected under extreme sea conditions.
The self-protection system and the self-protection method disclosed by the invention aim at the situation that the wave energy power generation device is greatly impacted by wind waves and causes severe vibration under extreme sea conditions, the principle of a dynamic vibration absorber is fully utilized, the lifting device drives the vibration absorbing block to ascend to serve as an upper layer structure, the working platform and the cylindrical floater are integrated to serve as a lower layer structure, and the vibration of the lower layer structure can be eliminated when the connected upper layer structure vibrates, so that the impact suffered by the working platform is reduced, the vibration of the whole wave energy power generation device is reduced, and meanwhile, the floater structure can be prevented from being damaged. The wave energy power generation device can be effectively protected in real time, the vibration of the working platform under extreme sea conditions is reduced to the maximum extent, and the safety of the floater is powerfully guaranteed; the automatic monitoring of vibration parameters and the automatic adjustment of the rising height of the vibration absorption block can be realized, the protection efficiency is high, and the automatic vibration absorption block can adapt to different extreme sea conditions.
The self-protection system disclosed by the invention has the advantages of simple structure, convenience in manufacturing, small occupied space and low cost, and can effectively prevent the working platform from overturning under an extreme sea condition.
drawings
FIG. 1 is a schematic view of the dynamic vibration absorber principle utilized in the present invention;
Fig. 2 is a schematic structural diagram of the self-protection system disclosed in embodiment 1 of the present invention under normal sea conditions;
Fig. 3 is a schematic structural diagram of the self-protection system disclosed in embodiment 1 of the present invention under extreme sea conditions;
FIG. 4 is a numerical model diagram with no self-securing action taken;
Fig. 5 is a numerical model diagram in which a self-securing measure is taken.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
as shown in fig. 1, taking forced vibration of a two-degree-of-freedom steel frame system under simple harmonic load as an example, the displacement amplitudes of the upper and lower layer structures are respectively:
D0＝(k11-θ2m1)(k22-θ2m2)-k12k21 (3)
Fp(t)＝Fpsinθt (4)
Wherein k is11＝k1+k2，k12＝k21＝-k2，k22＝k2，k1And k2The rigidity coefficients of the lower rod and the upper rod are respectively; y is2And Y1The displacement amplitude of the upper layer structure and the lower layer structure of the system is obtained; m is1Mass of primary system, m2As additional system mass; fp1And Fp2Simple harmonic loads acting on the understructure and the superstructure respectively, theta being the load frequency, where the load amplitude Fp1＝Fp，Fp2＝0。
When there is no superstructure to absorb shock, the displacement of the lower structure is:
Where omega is the natural frequency of vibration of the structure,When k is satisfied2＝θ2m2Under this condition
Y1＝0 (6)
I.e. the displacement amplitude of the underlying structure is 0. The mass m of the vibration absorber in the self-protection system2Comprises the following steps:
and the wind load born by the wind power generator after the wind power generator rises is smaller due to large density and small volume, namely the load amplitude Fp2Is close to 0; fp1The floater bears wave load, and because the floater has larger volume, the wave force borne by the floater under extreme sea conditions is huge, which can cause the inside of the floater to vibrate violently; therefore, k is easily satisfied when the whole system is used2＝θ2m2Under the condition, the displacement amplitude of the lower layer structure can be effectively reduced, namely, the violent vibration of the floater and the working platform is reduced to the maximum extent.
embodiment 1, as shown in fig. 1, this embodiment discloses a self-protecting system of a wave energy power generation device in an extreme ocean environment, which comprises two cylindrical rigid guide posts 8 with the bottom part deeply buried in the sea bottom and the top part exposed out of the sea surface, a working platform lifting device 4 mounted at the top ends of the guide posts, a working platform 2 mounted at the top ends of the working platform lifting device, a controller 3, a single chip microcomputer, an electromagnetic relay 10 and a storage battery 11 mounted inside the working platform, a vibration absorption block lifting device 9 mounted at the top part of the working platform, a vibration absorption block 1 mounted at the top part of the vibration absorption block lifting device, a cylindrical floater 6 which floats on the sea surface and can slide up and down along the two guide posts, an iron block 5 mounted at the top part of the cylindrical floater opposite to the electromagnetic relay, a power generation system 7 and a vibration sensor 12 mounted in the cylindrical floater, the single chip microcomputer is respectively electrically connected with the vibration sensor, the controller and the electromagnetic relay, the single chip microcomputer controls the lifting of the working platform lifting device and the vibration absorption block lifting device through the controller according to vibration parameters obtained from the vibration sensor, the power output end of the power generation system is electrically connected with the storage battery, and the storage battery supplies power for all parts in the self-protection system.
in this embodiment, the working platform is fixedly installed at the top end of the working platform lifting device in a welding mode. The bottom of the working platform lifting device is embedded and fixed at the top of the guide post; the vibration absorption block lifting device is embedded, welded and installed inside the working platform. The vibration absorption block is a mass block with large density and small volume. Just set up circular recess in work platform bottom to electromagnetic relay's position, the iron plate then is circular iron plate, and circular iron plate is inhaled to circular recess after by magnetic force, multiplicable cylindrical float and work platform's area of contact makes better an organic whole between them. The working platform lifting device and the vibration absorption block lifting device are telescopic tension and compression rods made of high-strength materials.
The working principle of the self-protection system depends on the dynamic vibration absorber principle, namely, when the two-degree-of-freedom system is forced to vibrate under the action of load, the vibration of the lower layer structure can be eliminated through the vibration of the connected upper layer structure. Therefore, when extreme sea conditions occur, the vibration absorber is lifted upwards through the vibration absorber lifting device to serve as an upper layer structure, and the vibration absorber, the cylindrical floater and the working platform are integrated to form a two-degree-of-freedom system when k is met2＝θ2m2When, Y1at 0, the amplitude of the vibrational displacement of the cylindrical float and the work platform is then 0. The working platform is subjected to a small wind load which can be ignored, and the cylindrical floater has a large volume and is subjected to a large wave force under an extreme sea condition, so that the state of the device under the extreme sea condition is numerically simulated to illustrate the use condition of the self-protection system disclosed by the embodiment.
Device conditions: the length of the guide post is 10m, and the diameter D10.15m, modulus of elasticity E1＝2.06×1011Pa(N/m2) (ii) a Cylindrical float parameters: the diameter D is 3.6m, the height h is 2.4m, and the total mass of the diameter D and the height h is 5 t; elastic modulus E of vibration absorber lifting device2＝2.678×1011Pa(N/m2) 0.04m in diameter; setting wave parameters of extreme sea conditions: wave height H is 3m,the period T is 8s, the wavelength is 71m, the wave number is 0.088, and the water depth d is 10 m. The horizontal wave force of the cylindrical floater can be obtained by the Morisen equation
The known coefficients are: cD＝1.2，CMsubstituting data for 2, F can be obtained from equation (9)p1＝fH78.412 kN; the allowable displacement of the vibration absorber is set to Y2k is 1m and is known from formula (7)278.412kN/m, load frequencythus, m is shown in the formula (8)2127.12kg, the absorber mass has a length of 2m, width of 0.2m, height of 0.05m, and density of 6356kg/m3Is made of high-density material, and its volume is small, and when it is raised under the extreme sea condition, the wind load is less than the wave force of float, i.e. load amplitude Fp2Is close to 0; as can be seen from the formula (5), the displacement Y of the substructure occurs when no protective measures are taken in extreme sea conditions10.64 m; at the same time according to k2And calculating the extending distance of the vibration absorber to be 2.17m, thereby meeting the design requirement. Therefore, the shock of 7.8 tons of force can be eliminated by using the 127.12kg shock absorber, and the stability of the cylindrical floater and the internal structure thereof can be greatly protected.
The feasibility of the method is demonstrated by carrying out numerical tests. Establishing a numerical model according to the parameters, wherein when no self-protection measure is taken under extreme sea conditions, the numerical model is as shown in figure 4, and the maximum displacement of the working platform under the action of waves is about 0.64 m; the numerical model after self-protection measures are taken is shown in fig. 5, the amplitude of the vibration absorber is 1m, the lifting distance is 2.17m, the design requirements are met, the maximum displacement of the cylindrical floater and the working platform under the action of waves is about 0.08m, the equipment such as the motor on the oscillating floater and the working platform is well protected, and the damage of the equipment such as the motor caused by severe shaking of the working platform under the extreme sea condition is avoided.
The embodiment also discloses a self-protection method of the wave energy power generation device in the extreme ocean environment, and the self-protection system comprises the following steps:
(1) The vibration sensor senses the vibration displacement amplitude of the cylindrical floater in real time and transmits the vibration displacement amplitude to the single chip microcomputer, and the single chip microcomputer carries out real-time, comprehensive and multifunctional intelligent processing on sensed data;
(21) Under normal sea conditions, as shown in fig. 1, when the vibration displacement amplitude is within a preset safety range, the cylindrical floater does vertical oscillation movement along with waves to drive the power generation system in the cylindrical floater to generate power, and the power generated by the power generation system can be output to the storage battery for storage;
(22) Under extreme sea conditions, as shown in fig. 2, the vibration displacement amplitude exceeds a preset safety transition range, the single chip microcomputer controls the vibration absorption block lifting device to drive the vibration absorption block to rise through the controller, the rising height is adjusted in real time according to the vibration displacement amplitude through the single chip microcomputer, the single chip microcomputer is also connected with the electromagnetic relay and controls the working platform lifting device to fall through the controller until the magnetic force of the electromagnetic relay attracts the iron block to attract the cylindrical floater to the bottom of the working platform, at the moment, the cylindrical floater and the working platform form a whole, and the vibration absorption block adjusts the displacement amplitude of the whole within the safety transition range;
(221) When the sea surface returns to the normal sea condition, and the vibration displacement amplitude is reduced to the preset safety range again, the single chip microcomputer controls the vibration absorption block lifting device through the controller to drive the vibration absorption block to fall to the initial position, the single chip microcomputer also disconnects the electromagnetic relay and controls the working platform lifting device to rise to the initial position through the controller, after the electromagnetic relay is disconnected, the magnetic force disappears, the cylindrical floater falls back to the sea surface again, and the cylindrical floater continues to swing along with the waves to generate electricity.
Two cylindrical rigid guide columns are deeply buried in the sea floor, the top ends of the two cylindrical rigid guide columns are welded with the working platform through the lifting device, and the descending working platform and the floater form a lower-layer structure together in extreme sea conditions. Normally, the amplitude of the vibration displacement of the cylindrical float has a certain safety range, and the general motion equation is X-Xmsin2 pi ft, therefore, different wave energy power generation devices need to set a safe displacement amplitude range according to actual sea conditions. For example vibration displacement parameters when in normal sea conditionsThe method comprises the following steps: 0-0.3 m; the vibration displacement parameter range of the safe transition is set as follows: 0.3-0.5 m; the danger of the inside of the cylindrical float being destroyed when the safety transition range is breached is therefore not allowed. Under normal sea conditions, the vibration parameters of the working platform change within a normal range, and the wave energy power generation device generates power normally; when extreme sea conditions occur, the vibration intensity of the working platform can reach or exceed the parameter limit under normal sea conditions, the vibration sensor and the single chip microcomputer can carry out real-time analysis on the displacement amplitude, once the analysis result exceeds the parameter range of safe transition (the vibration displacement exceeds 0.5m), the controller is started, and the controller controls the expansion and contraction of the lifting device; when the vibration sensor monitors that the parameter value is reduced to the normal sea condition range (the vibration displacement is less than 0.3m), the lifting device restores the original state. The bottom of the vibration absorption block lifting device is embedded and welded in the working platform, the vibration absorption block is fixed at the top of the lifting device, and the controller is fixedly arranged on one side of the working platform; the working platform lifting device is fixedly embedded in the guide post, is of a telescopic structure and is simultaneously controlled to stretch by one controller. All power transmission lines are made of special materials, seawater corrosion is avoided, and the storage battery supplies power for all output devices. When extreme sea conditions occur, the raised vibration absorber is small in size and small in stress amplitude under the action of wind load, so that the vibration absorber can serve as an upper layer structure of a two-degree-of-freedom system, vibration energy of a lower layer structure is effectively absorbed, and stability of the floater and the working platform under the extreme sea conditions is protected.
Claims (9)
1. a self-containment system for a wave energy power plant in an extreme marine environment, characterized by: the self-protection system comprises two cylindrical rigid guide columns, wherein the bottoms of the two cylindrical rigid guide columns are deeply embedded in the sea bottom, the tops of the two cylindrical rigid guide columns are exposed out of the sea surface, a working platform lifting device is installed at the top ends of the guide columns, a working platform is installed at the top end of the working platform lifting device, a controller, a single chip microcomputer, an electromagnetic relay and a storage battery are installed inside the working platform, a vibration absorption block lifting device is installed at the top of the working platform, a vibration absorption block is installed at the top of the vibration absorption block lifting device, a cylindrical floater penetrates through the two guide columns, floats on the sea surface and can slide up and down along the two guide columns, an iron block is installed at the position, right facing the electromagnetic relay, of the top of the cylindrical floater, a power generation system and a vibration sensor are installed in the cylindrical floater, the single chip microcomputer is respectively electrically connected with the vibration sensor, the controller and the electromagnetic relay, and the single chip microcomputer controls The power output end of the power generation system is electrically connected with the storage battery, and the storage battery supplies power to all parts in the self-protection system.
2. A self-containment system for a wave power plant in an extreme marine environment as defined in claim 1, wherein: the working platform is fixedly arranged at the top end of the working platform lifting device in a welding mode.
3. A self-containment system for a wave power plant in an extreme marine environment as defined in claim 1, wherein: the bottom of the working platform lifting device is embedded and fixed at the top of the guide post; the vibration absorption block lifting device is embedded, welded and installed inside the working platform.
4. A self-containment system for a wave power plant in an extreme marine environment as defined in claim 1, wherein: the vibration absorption block is a mass block with large density and small volume.
5. A self-containment system for a wave power plant in an extreme marine environment as defined in claim 1, wherein: a circular groove is arranged at the position, right opposite to the electromagnetic relay, of the bottom of the working platform, and the iron block is a circular iron block.
6. A self-containment system for a wave power plant in an extreme marine environment as defined in claim 1, wherein: the working platform lifting device and the vibration absorption block lifting device are telescopic tension and compression rods.
7. A method of self-sustaining wave energy power plants in extreme marine environments, using the self-sustaining system of claim 1, comprising the steps of:
(1) The vibration sensor senses the vibration displacement amplitude of the cylindrical floater in real time and transmits the vibration displacement amplitude to the single chip microcomputer, and the single chip microcomputer processes sensed data in real time;
(21) under normal sea conditions, the vibration displacement amplitude is within a preset safety range, the cylindrical floater does vertical oscillation motion along with waves to drive a power generation system inside the cylindrical floater to generate power, and the power generated by the power generation system can be output to a storage battery for storage;
(22) Under extreme sea conditions, the vibration displacement amplitude exceeds a preset safety transition range, the single chip microcomputer controls the vibration absorption block lifting device to drive the vibration absorption block to ascend through the controller, the ascending height is adjusted in real time through the single chip microcomputer according to the vibration displacement amplitude, the single chip microcomputer is also connected with the electromagnetic relay and controls the working platform lifting device to descend through the controller until the magnetic force of the electromagnetic relay attracts the iron block to attract the cylindrical floater to the bottom of the working platform, at the moment, the cylindrical floater and the working platform form a whole, and the vibration absorption block adjusts the displacement amplitude of the whole within the safety transition range;
(221) When the sea surface returns to the normal sea condition, and the vibration displacement amplitude is reduced to the preset safety range again, the single chip microcomputer controls the vibration absorption block lifting device through the controller to drive the vibration absorption block to fall to the initial position, the single chip microcomputer also disconnects the electromagnetic relay and controls the working platform lifting device to rise to the initial position through the controller, after the electromagnetic relay is disconnected, the magnetic force disappears, the cylindrical floater falls back to the sea surface again, and the cylindrical floater continues to swing along with the waves to generate electricity.
8. A method of self-containment of a wave power plant in an extreme marine environment according to claim 7, characterized in that: in the step (1), the vibration sensor senses the vibration displacement amplitude of the cylindrical floater in real time, and the singlechip controls the singlechip to work according to the general motion equation X of the vibration displacementmsin2 π ft to determine the vibration displacement X, Xmrepresenting the vibration displacement amplitude, f representing the vibration frequency.
9. A method of self-containment of a wave power plant in an extreme marine environment according to claim 8, characterized in that: the safe range of the vibration displacement amplitude of the cylindrical floater can be set to be 0-0.3m, and the safe transition range can be set to be 0.3-0.5 m.
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