CN114620194B - Multi-step motion compensation connection method between multiple bodies of offshore floating type photovoltaic system - Google Patents
Multi-step motion compensation connection method between multiple bodies of offshore floating type photovoltaic system Download PDFInfo
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- CN114620194B CN114620194B CN202210141679.0A CN202210141679A CN114620194B CN 114620194 B CN114620194 B CN 114620194B CN 202210141679 A CN202210141679 A CN 202210141679A CN 114620194 B CN114620194 B CN 114620194B
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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
- 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
- F16F15/022—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 using dampers and springs in combination
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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
- F16F15/04—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 using elastic means
- F16F15/06—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 using elastic means with metal springs
- F16F15/067—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 using elastic means with metal springs using only wound springs
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S20/00—Supporting structures for PV modules
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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
- B63B2035/4433—Floating structures carrying electric power plants
- B63B2035/4453—Floating structures carrying electric power plants for converting solar energy into electric energy
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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
- B63B2221/00—Methods and means for joining members or elements
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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
- B63B2221/00—Methods and means for joining members or elements
- B63B2221/20—Joining substantially rigid elements together by means that allow one or more degrees of freedom, e.g. hinges, articulations, pivots, universal joints, telescoping joints, elastic expansion joints, not otherwise provided for in this class
- B63B2221/22—Joining substantially rigid elements together by means that allow one or more degrees of freedom, e.g. hinges, articulations, pivots, universal joints, telescoping joints, elastic expansion joints, not otherwise provided for in this class by means that allow one or more degrees of angular freedom, e.g. hinges, articulations, pivots, universal joints, not otherwise provided for in this class
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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
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The multi-step motion compensation connection method between the bodies of the offshore floating photovoltaic system comprises a floating body module, and the floating body module is provided with: an upper bracket configured to carry a solar photovoltaic module and a lower floating body configured to support the upper bracket; the connection method comprises the following steps: at least one first motion compensation device is arranged at the joint of the upper bracket and the lower floating body and is configured to absorb the impact of environmental load at the joint of the upper bracket and the lower floating body; at least one second motion compensation device is arranged between adjacent buoyant body modules, which is configured to connect adjacent buoyant body modules and absorb the impact of the environmental load acting between adjacent buoyant body modules. The invention converts the ocean engineering monomer into the damping multi-body, the first-step motion compensation device compensates, releases and lightens the pressure at the second-step motion compensation device, the impact of the environmental load on the second motion compensation device serving as the connector is obviously reduced, and the stability of the system is improved.
Description
Technical Field
The invention belongs to the technical field of ocean engineering, and particularly relates to a multi-step compensation connection method among multiple bodies of an offshore floating type photovoltaic system.
Background
In recent years, solar photovoltaic power generation has been rapidly developed as a green clean renewable energy source. However, the development of solar photovoltaic power generation also has some bottlenecks: on one hand, the land solar photovoltaic power generation needs to occupy larger land area, and the development of the land solar photovoltaic power generation station is restricted by the scarcity of land resources; on the other hand, most of the land solar photovoltaic power stations are built in desert regions far away from power utilization centers, and long-distance power transmission greatly increases the power utilization cost of solar photovoltaic power generation, so that the land solar photovoltaic power stations become another restriction factor of the development of the land solar photovoltaic power stations. The overwater solar photovoltaic power generation technology can well solve the problems that land solar photovoltaic power stations occupy more land resources and are far away from power utilization centers. In addition, the overwater solar photovoltaic power generation technology also has the advantages of high power generation efficiency, ecological friendliness, capability of being developed with the breeding industry in a synergistic manner and the like. The traditional overwater solar photovoltaic power generation faces the problem that the area of a closed water area suitable for development is insufficient, and if the overwater solar photovoltaic power generation needs to be developed in a large scale, the overwater solar photovoltaic power generation in a sea water area is a necessary way for development. The offshore solar photovoltaic platform is mostly arranged in open ocean water, can be combined with various industries such as offshore hydrogen production, ocean fishery, offshore wind power and the like, and has good commercial development prospect.
However, compared with the traditional overwater solar photovoltaic power generation platform arranged in a closed water area, the offshore solar photovoltaic platform faces a more severe environment load, the design requirement of the offshore solar photovoltaic platform is greatly different from that of the overwater solar photovoltaic power generation platform in the closed water area, and the economic cost and the safety are main factors restricting the industrial development of the offshore solar photovoltaic platform. Most of offshore photovoltaic power generation plants are developed on a large scale from the perspective of economic energy obtaining, and the work and economic performance of the ultra-large floating photovoltaic power generation station directly influence the investment income. Due to the huge size of the floating structure, the modular construction structure is the only solution in view of multiple dimensions such as construction, transportation and daily maintenance, and therefore, the connector also becomes a key part of the modular construction structure. Various connector designs are provided in the prior art, for example, a connector between modules of an ultra-large ocean floating structure is disclosed in the Chinese invention patent application (CN 102975822A), and the design specifically comprises the following steps: the ocean floating structure comprises at least two pairs of anode bodies and cathode bodies which are arranged in groups, wherein the anode bodies and the cathode bodies are respectively embedded in two corresponding ends of the upper bodies of the two connected ocean floating structure modules in the transverse direction. ", and further connected by hydraulic means. The invention relates to a Chinese patent (CN 103963935A), wherein a cylindrical groove is formed in an anode carrier, a first revolving body is arranged in the cylindrical groove and connected with an anode transverse blocking plate, a cylindrical through hole is formed in one side of the first revolving body, a sealing plate is arranged at the tail end of the cylindrical through hole, a cylindrical groove is formed in a cathode carrier provided with an electric permanent magnetic chuck … in the cylindrical through hole, a second revolving body is arranged in the cylindrical groove of the cathode carrier and connected with the cathode transverse blocking plate, and a cylindrical groove extending outwards is formed in one side of the second revolving body. "the connection is completed by three processes of positioning, inserting and locking. The Chinese invention patent (CN 105757109A) realizes connection through a negative pressure vacuum chuck connector.
Although the three connectors can realize modular connection and disassembly of ultra-large offshore floating structures, the connectors are designed for offshore rapid transport transportation hubs, large deep and offshore development operating platforms, ocean material storage relay stations and offshore maneuvering rapid reaction comprehensive military platforms respectively, complex execution mechanisms such as hydraulic oil cylinders, electromagnetic suction cups, vacuum suction cups and the like need to be adopted in the connectors, the connectors are used among modules, and the connectors are difficult to guarantee the reliability and the economy of the connectors for floating photovoltaic power stations with different module upper structure dynamics characteristics, service requirements and design safety levels.
Disclosure of Invention
The invention designs and provides a multi-step motion compensation connection method among a plurality of bodies of an offshore floating photovoltaic system, aiming at the problems that in the prior art, a connector designed for a high-speed transport transportation hub in open sea, a large deep and open sea development operation platform, an ocean material storage relay station and an offshore maneuvering and rapid reaction comprehensive military platform is only applied among modules, and an execution structure of the connector is not matched with the dynamic characteristics, the service requirements and the reliability and the economy required by the design safety level of a floating body module of a floating photovoltaic power station.
In order to realize the purpose of the invention, the invention adopts the following technical scheme to realize:
a multi-step motion compensation connection method among a plurality of bodies of an offshore floating photovoltaic system comprises a floating body module, wherein the floating body module comprises: an upper support configured to carry a solar photovoltaic module; and a lower float configured to support the upper bracket; the connection method comprises the following steps: at least one first motion compensation device is arranged at the joint of the upper bracket and the lower floating body, and the first motion compensation device is configured to absorb the impact of environmental load at the joint of the upper bracket and the lower floating body; and arranging at least one second motion compensation device between adjacent floating body modules, the second motion compensation device being configured to connect adjacent floating body modules and absorb the impact of the environmental load acting between adjacent floating body modules.
Compared with the prior art, the invention has the advantages and positive effects that:
the connection method provided by the invention is characterized in that a first-step motion compensation device is arranged between the lower floating body and the service functional bracket, a second-step motion compensation device is arranged between the floating body modules, and the first-step motion compensation coupling design between the floating body motion characteristics of the floating body modules and the service functional bracket is adopted to replace the underwater mooring scheme of the traditional platform while absorbing the impact of the environmental load, thereby avoiding large-scale underwater construction and effectively reducing the overall construction cost of the engineering; a second motion compensation device is further arranged between the floating body modules, and the second motion compensation device can be used as a connector on one hand and can also realize motion compensation on the other hand; in addition, the first-step motion compensation device can compensate, release and relieve the pressure at the second-step motion compensation device, the impact of the environmental load on the second motion compensation device serving as the connector is obviously reduced, the stability of the system is improved, and meanwhile, the service life of the connector can be prolonged.
The invention has the following advantages: the multi-body structure is clear in mechanical concept and reliable in performance, is realized based on multi-body system motion and dynamic coupling rules, can be combined with engineering platforms such as Semi-submersible (Semi) platforms, ship-type (Barge) platforms, tension leg Type (TLP) platforms and column-type (Spar) platforms which are adopted by large-size complex multi-body structure integral constraint modules, can adopt rich existing experience in construction, installation, operation and maintenance, and effectively guarantees stable performance of the multi-body of the offshore floating photovoltaic system.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an offshore floating photovoltaic system using the multi-step motion compensation connection method between multiple bodies provided by the present invention;
FIG. 2 is a schematic structural view of the buoyant body module of FIG. 1;
FIG. 3 is a schematic view of the upper bracket of FIG. 2;
FIG. 4 is a schematic structural view of the lower float of FIG. 2;
fig. 5 is a schematic view of a first view configuration of the floating body module of fig. 1 with a second motion compensation device disposed therebetween;
FIG. 6 is a partially enlarged view of the portion A in FIG. 5, in which the structure of the joint wiring is also shown;
fig. 7 is a schematic structural diagram of the second motion compensation apparatus in fig. 5 or fig. 6;
FIG. 8 is a schematic view of the connection between the first motion compensator and the support post of FIG. 2;
fig. 9 is a schematic view of a second view configuration of the floating body modules of fig. 1 with a second motion compensation device disposed therebetween;
figure 10 is a time course displacement curve of an intermediate float module provided with a first motion compensation means;
FIG. 11 is a time course stress curve at the junction of the upper bracket and the lower float in the intermediate float module provided with a first motion compensation device;
FIG. 12 is a time course stress curve of the joint of the upper bracket and the lower floating body in the middle floating body module which is fixedly connected;
FIG. 13 is a simulation force analysis diagram in which the floating body modules are simplified into four;
figure 14 is a time course force curve for the connection position 1 when the float module employs a conventional connector;
fig. 15 is a time course force curve of the coupling position 1 when only the second motion compensation means is used;
fig. 16 is a time course stress curve of the coupling position 1 when both the first motion compensation means and the second motion compensation means are used;
fig. 17 is a time course force curve of the connection position 2 when the floating body module adopts the conventional connector;
fig. 18 is a time course force curve for the connection position 2 when only the second motion compensation means is used;
fig. 19 is a time course force curve of the connection position 2 when the first motion compensation means and the second motion compensation means are used simultaneously;
fig. 20 is a time course force curve for the connection position 3 when the float module employs a conventional connector;
fig. 21 is a time course force curve of the connection position 3 when only the second motion compensation means is used;
fig. 22 is a time course force curve of the connection location 3 when both the first motion compensation means and the second motion compensation means are used;
figure 23 is a time course force curve for connection position 4 when the float module employs a conventional connector;
fig. 24 is a time course force curve of the connection position 4 when only the second motion compensation means is used;
fig. 25 shows the time course of the force curve of the connection point 4 when the first motion compensation device and the second motion compensation device are used simultaneously.
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 with reference to the accompanying drawings and examples.
The terms "first," "second," "third," and the like in the description and in the claims, and in the drawings, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference throughout this specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. One skilled in the art will appreciate that the embodiments described herein can be combined with other embodiments.
Aiming at the problems that in the prior art, connectors designed for a far-sea rapid transportation hub, a large-scale deep and far-sea development operation platform, an ocean material storage relay station and an offshore maneuvering rapid reaction comprehensive military platform are only applied among floating body modules, and the executing structure of the connectors is not matched with the dynamic characteristics, the service requirements and the reliability and the economy required by the design safety level of the upper structure of the floating body module of a floating photovoltaic power station, a multi-step motion compensation connection method among multiple bodies of an offshore floating photovoltaic system is designed and provided, and the connection method provided by the invention is described in detail below by combining with the attached drawings. Fig. 1 is a schematic structural diagram of an offshore floating photovoltaic system adopting the multi-interbody multi-step motion compensation connection method provided by the invention. The offshore floating photovoltaic system 1 shown in fig. 1 comprises a plurality of floating body modules 10, wherein the floating body modules 10 are distributed in an equidistant rectangular array and are connected with each other to form a floating platform array. The number of rows and columns of the floating platform array can be designed according to the scale of the floating photovoltaic power station, and is not further limited herein. In addition to the matrix array distribution, the floating body modules 10 may be distributed in an equally spaced concentric ring array or in an array of other shapes under conditions that meet environmental conditions and usage requirements. From the perspective of the structural design of the individual buoyant modules 10, each buoyant module 10 includes an upper bracket 18 and a lower buoyant body 22. The upper support 18 is configured to carry a solar photovoltaic module, which includes a solar photovoltaic panel 20, a junction box, a controller, an inverter, a system grid connection device, a grounding system, and the like. While lower float 22 has good motion properties and floats on the sea surface to support upper support 18. Compared with the mode that the modules are connected through the connectors in the prior art, the multi-step motion compensation connection method for the offshore floating photovoltaic system 1 ensures that the offshore floating photovoltaic system 1 is stably and reliably connected through two-step motion compensation. Specifically, the connection method includes the steps of:
first, at least one first motion compensation device (shown as 26 and 28 in fig. 2) is provided at the junction of upper carriage 18 and lower float 22 as a first step of motion compensation. The first motion compensation means is configured to absorb the impact of environmental loads at the junction of upper bracket 18 and lower float 22. Secondly, at least one second motion compensation device 48 is arranged between adjacent buoyant body modules 10. The second motion compensation device 48 is configured to connect adjacent floating body modules 10 and absorb the impact of the environmental load acting between adjacent floating body modules 10, wherein the upper bracket 18 serves as a functional support in service. The connection method provided by the invention is that a first-step motion compensation device is arranged between the lower floating body 22 and the service functional bracket, a second-step motion compensation device is arranged between the floating body modules 10, and the first-step motion compensation coupling design between the floating body motion characteristics of the floating body modules 10 and the service functional bracket absorbs the impact of environmental load and replaces the underwater mooring scheme of the traditional platform, thereby avoiding large-scale underwater construction and effectively reducing the overall construction cost of engineering; furthermore, a second motion compensation device 48 is provided between the buoyant body modules 10, which second motion compensation device 48 can be used on the one hand as a connector and on the other hand also enables motion compensation; in addition, the first motion compensation device can compensate, release and relieve the pressure at the second motion compensation device, so that the impact of the environmental load on the second motion compensation device 48 serving as the connector is obviously reduced, the stability of the system is improved, and the service life of the connector can be prolonged. The first and second motion compensation devices 48 may be implemented by passive spring damping structures or by active compensation structures with a drive (e.g., hydraulic or electric) and the dynamic parameters of the first and second motion compensation devices 48 may be dynamically adjusted in the simulation calculation software to achieve the desired kinematic coupling effect. The first and second motion compensation means 48 will be described in further detail below.
From the mooring anchoring point of view, a plurality of restrained buoyant modules 10 and a plurality of intermediate buoyant modules (the other intermediate connecting buoyant modules than the restrained buoyant modules 10 are defined as intermediate buoyant modules) are divided among the plurality of buoyant modules 10, see fig. 1, wherein the restrained buoyant modules 12 are shown disposed at the corners of the array of floating platforms, and the restrained buoyant modules 12 are connected to two adjacent buoyant modules 10 by second motion compensation means 48. In some other embodiments of the array distribution, the restraining buoyant body modules 12 can also be connected to only one adjacent buoyant body module 10 by means of a second compensating device. The intermediate buoyant body modules are then connection buoyant body modules which are each connected to at least three other adjacent buoyant body modules via a second motion compensation device 48, or to one restraint buoyant body module 12 and two adjacent buoyant body modules via a second motion compensation device 48. The buoyant modules 12 are connected to anchoring devices 16 by mooring devices 14. The mooring means 14 and anchoring means 16 to which the buoyant modules 12 are constrained to mate may employ engineering concepts well established in the art, such as mooring means 14 and anchoring means 16 suitable for Semi-submersible (Semi), barge, tension Leg (TLP) and Spar (Spar) platforms, as shown in fig. 1, where the mooring means 14 and anchoring means 16 are in the existing catenary mode.
The first motion compensation means (26, 28) are optionally designed as a passive elastic damping structure, as shown in fig. 8, in which at least one first elastic damping element 64 is provided. The first motion compensation means (26, 28) is configured to absorb the impact of environmental loads at the junction of the upper bracket 18 and the lower float 22 by the shock absorbing action of the first elastic damping element 64. Aiming at the first motion compensation device formed by the passive elastic damping structure, the connection method also comprises the following steps.
As shown in fig. 2 and 4, taking the basic frame member lower float 22 of a Semi-submersible (Semi) platform as an example on the one hand, the lower float 22 is provided with a plurality of sets of support columns 24, and each set of support columns 24 is provided with a transverse first motion compensation device 26 and a longitudinal first motion compensation device 28, respectively. The lateral first motion compensator 26 and the longitudinal first motion compensator 28 may be fixedly disposed in the first mounting holes 44 of the support columns 24. On the other hand, as shown in fig. 3, the upper bracket 18 is provided with a first lever member 36 and a second lever member 42, and the first lever member 36 and the second lever member 42 are respectively passed through two adjacent sets of support posts 24 to connect the upper bracket 18 and the lower float 22, for example, as shown in fig. 8, from second mounting holes 46 on the support posts 24. One of the transverse first motion compensator 26 and the longitudinal first motion compensator 28 is disposed through the outside of the first rod member 36, and the other one is disposed through the outside of the second rod member 42. The first elastic damping elements 64 in the transverse first motion compensation device 26 and the first elastic damping elements 64 in the longitudinal first motion compensation device 28 extend in a direction perpendicular to each other. A passive elastic damping structure between upper bracket 18 and lower float 22 is formed by two first elastic damping elements 64 extending perpendicularly to each other, absorbing impact generated by deformation from both directions, and reducing shock. Lower buoy 22 may also be adapted to a boat (Barge) platform, a Tension Leg (TLP) platform, a Spar (Spar) platform.
In an alternative embodiment, shown in figure 3, the upper rack 18 is provided consisting of a body 30 and an extended guardrail 38. The body 30 comprises a plurality of groups of support rods 32, the support rods 32 are preferably uniformly distributed at equal intervals, and a plurality of mounting positions 34 for mounting the solar photovoltaic panel 20 are formed between any two groups of support rods 32. As shown in fig. 1, seven solar photovoltaic panels 20 can be installed at the installation site 34 between the two sets of support rods 32, and the solar photovoltaic panels 20 have a set inclination angle. The necessary guards may be provided as desired at the mounting locations 34. Extension guardrail 38 is further provided to surround body 30 to form a maintenance access and an installation site for equipment such as an AC distribution box, a monitoring system, a meteorological data acquisition system, etc. A first motion compensation means is further provided by connecting the support columns 24 and the extension railings 38 by means of the first and second rod elements 36, 42, respectively, forming a connection between the upper carriage 18 and the lower float 22.
The second motion compensator 48 is optionally also designed as a passive elastic damping structure, in which at least one second elastic damping element 62 is arranged. Referring to fig. 5 to 7 and fig. 9, the connection manner of the second motion compensation device 48 will be described. The first end 52 of the second motion compensation device 48 is arranged to be hinged to the body 30 of the upper bracket 18 of one of the two adjacent buoyant modules 10 by means of a first hinge device 50, the hinge point preferably being arranged on the center line of the buoyant module 10. Similarly, the second end 54 of the second motion compensator 48 is arranged to be hinged to the body 30 of the upper bracket 18 of the other of the two adjacent buoyant modules 10 by a second hinge 56, again preferably arranged on the centreline of the buoyant module 10. Optionally, the second elastic damping element 62 is disposed in the first end portion 52, the translating element 70 is disposed in the second end portion 54, the translating element 70 is disposed in the second elastic damping element 62 and can move along the direction of arrow D in fig. 7, and the translating element 70 constitutes a translation pair. The first end 52 and the second end 54 are connected and fixed so that the effect of the connector and the absorption of the impact of environmental loads is simultaneously achieved by the second motion-compensating device 48.
As shown in fig. 6, the solar photovoltaic panel 20 is arranged with the bus cable 58 arranged along the extending direction of the second motion compensation device 48, and the bus cable 58 is fixed on one side of the second motion compensation device 48 by the buckle 60, so as to realize the comprehensive wiring between the floating body modules 10. The wiring corridor in parallel with the second motion compensation device 48 can reduce the connection failure of the bus cable 58 caused by the relative motion through the second elastic damping element 62 extending in the same direction, the joint position of the bus cable 58 is clear, and the overall reliability of the equipment is improved. The inverter 66 is preferably disposed above the upper bracket 18.
The offshore floating photovoltaic system designed by the multi-step motion compensation connection method among the offshore floating photovoltaic system bodies, wherein the first motion compensation device enables the ocean engineering monomer to be converted into the shock absorption multi-body, can meet the working performance requirement of the upper support serving as a service functional component, can conveniently replace underwater mooring after being converted into the shock absorption multi-body, and reduces the whole construction cost of the engineering; the second motion compensation device is used as a connector and a damping component for absorbing environmental load acting force, and under the auxiliary action of the first motion compensation device, the bearing pressure is obviously reduced, so that a more reasonable and efficient connector can be formed.
The multi-step motion compensation connection method between the multiple bodies of the offshore floating type photovoltaic system, provided by the invention, has the advantages of clear mechanical concept and reliable performance of the multiple bodies, is realized based on the motion and power coupling rule of the multiple bodies, can be combined with engineering platforms adopted by large-size complex multi-body structure integral constraint modules, such as Semi-submersible (Semi) platforms, ship-type (Barge) platforms, tension Leg (TLP) platforms and column-type (Spar) platforms, can adopt rich existing experiences in construction, installation, operation and maintenance, and effectively ensures the stable performance of the multiple bodies of the offshore floating type photovoltaic system.
The following describes simulation calculation of the offshore floating photovoltaic system 1 connected by the multi-step motion compensation connection method between the offshore floating photovoltaic system 1 provided by the present invention. During simulation design, the first motion compensation dynamics parameter range is set according to the marine environment condition of the service sea area of the offshore floating photovoltaic system, and the second motion compensation dynamics parameter range is set according to the number of required connectors and the strength requirement of the set material. The marine environmental condition of the offshore floating photovoltaic system can be obtained through a database of a meteorological department and can also be obtained through calculation according to a data model. The number of connectors required can be calculated from the set number of float modules required.
The mass properties of the floating body module 10 are set in the simulation calculation software. Illustratively, the upper support 18 is made of a metal material, for example, the upper support 18 is configured as a steel frame, the total weight of the upper support 18 carrying the photovoltaic module including the plurality of solar photovoltaic panels 20 is configured as 23 tons, and the total weight of the semi-submersible lower float 22 is configured as 12 tons.
And setting the environmental load of the marine environmental conditions of the service sea area in simulation calculation software. For example, environmental load is intended to set conditions for a 50 year-round mechanism: wind load is 34m/s, sea current load is 1.07m/s, wave load effective wave height is 3.22m, and spectrum peak frequency is 0.123Hz.
And setting the water depth of a service field of the marine environmental conditions of the service sea area in simulation calculation software. Illustratively, the average water depth of the service site is set to be 12 meters.
And setting the direction of the environmental load in the simulation calculation software. For example, the environmental loads may be set to be applied in the same direction.
The mooring mode is set in the simulation calculation software. Illustratively, the mooring mode may be set to catenary mode.
In this embodiment, the dynamic parameters of the first step of motion compensation are set, that is, the dynamic parameters of the first motion compensation device are set, that is, at least the spring rate and the damping of the first elastic damping element in the first motion compensation device are included, that is, the spring rate and the damping of the first elastic damping element 64 in the first motion compensation device (26, 28) are set according to the marine environmental conditions of the service sea area of the offshore floating photovoltaic system. The setting of the dynamic parameters of the second motion compensation device, i.e. at least the spring rate and the damping of the second elastic damping elements in the second motion compensation device, i.e. the spring rate and the damping of the second elastic damping elements 62 in the second motion compensation device 48 depending on the set number of float modules and the set material strength. And completing case numerical simulation by a multi-body dynamics analysis method. The analysis result shows that the first-step motion compensation realized by the first motion compensation device has the effects of damping and reducing stress at the multi-body connection part, the second-step motion compensation realized by the second motion compensation device and the first-step motion compensation are jointly applied to reduce the connection force between modules, the compensation effect in each direction is uniform, and the influence of the excitation direction of the environmental load is small.
Fig. 10 is a time course displacement curve of an intermediate float module provided with a first motion compensation device, wherein the solid line shows the time course displacement curve of the lower float 22 alone and the dashed line shows the time course displacement curve of the upper carriage 18 relative to the lower float 22. As can be seen from fig. 10, the time course displacement of upper bracket 18 with respect to lower float 22 after monomer compensation using the first motion compensation device is in opposite phase to the independent time course displacement of lower float 22. The desired shock absorption is achieved by providing the spring rate and damping of the first elastic damping element 64 and the spring rate and damping of the second elastic damping element 62.
Fig. 11 shows the time course of the force curve at the connection of the upper support 18 and the lower float 22 in the intermediate float module 10 provided with the first motion compensation device. Fig. 12 is a time course force curve of the junction of the upper support 18 and the lower float 22 in the intermediate float module 10 using a fixed connection. As can be seen from a comparison of fig. 11 and 12, when the fixed connection is adopted under the excitation of the same environmental load condition, the maximum stress at the connection position of the upper bracket 18 and the lower floating body 22 is 76971N. When the first motion compensation device is used, the maximum stress at the joint of the upper bracket 18 and the lower float 22 is 76971N. With the first motion compensation device, the maximum force at the connection of upper bracket 18 and lower float 22 is only 11.7% of that with the fixed connection.
In fig. 13, the floating body module 10 is simplified into four (10-1, 10-2, 10-3 and 10-4) to analyze the force of each connection point (48-1, 48-2, 48-3 and 48-4), where X is the simulated force direction. Referring to fig. 14-16, fig. 14 illustrates the use of the float module 10 in fig. 14The stress curve of the connection position 1 (shown as 48-1) in the conventional connector, fig. 15 is the stress curve of the connection position 1 when only the second motion compensation device 48 is used, and fig. 16 is the stress curve of the connection position 1 when both the first motion compensation device and the second motion compensation device 48 are used. From the comparison of the forces in fig. 14 to 16, it can be seen that the maximum force of the connection location 1 is 1.34 × 10 when the first motion compensation means (26, 28) and the second motion compensation means 48 are provided simultaneously 5 N, the maximum force is reduced by 17.11% compared to the case where only the second motion compensation device 48 is used, and by 85.01% compared to the case where the conventional connector is used.
Reference is made to fig. 17 to 19, where fig. 17 is a time course force curve for the connection position 2 (shown as 48-2 in the figure) when the floating body module 10 uses a conventional connector, fig. 18 is a time course force curve for the connection position 2 when only the second motion compensation device 48 is used, and fig. is a time course force curve for the connection position 2 when both the first motion compensation device (26, 28) and the second motion compensation device 48 are used. As can be seen from the comparison of the forces in fig. 17 to 19, when the first motion compensation device and the second motion compensation device 48 are provided at the same time, the maximum force at the connection position 2 is 1.59 × 105N, which is reduced by 88.62% compared to the case of using only the second motion compensation device 48, and is reduced by 91.59% compared to the case of using the conventional connector.
Reference is made to fig. 20 to 22, where fig. 20 is a time course force curve for the connection position 3 when the float module 10 uses a conventional connector, fig. 21 is a time course force curve for the connection position 3 when only the second motion compensation device 48 is used, and fig. 22 is a time course force curve for the connection position 3 when both the first motion compensation device and the second motion compensation device 48 are used. As can be seen from the comparison of the forces in fig. 20 to 22, the maximum force of the connection location 3 is 1.60 × 10 when the first motion compensation means (26, 28) and the second motion compensation means 48 are provided simultaneously 5 N, the maximum force is reduced by 54.49% compared to the case where only the second motion compensation device 48 is used, and 65.81% compared to the case where the conventional connector is used.
Referring to FIGS. 23 to 25, wherein FIG. 23 is a drawingThe time course stress curve of the connection position 4 when the floating body module 10 uses the conventional connector, fig. 24 is the time course stress curve of the connection position 4 when only the second motion compensation device 48 is used, and fig. 25 is the time course stress curve of the connection position 4 when both the first motion compensation device (26, 28) and the second motion compensation device 48 are used. As can be seen from the comparison of the forces in Figs. 23 to 25, the maximum force applied to the connection location 4 is 1.22 x 10 when the first motion compensation means and the second motion compensation means 48 are provided simultaneously 5 N, the maximum force is reduced by 41.12%% compared to the case where only the second motion compensation device 48 is used, and the maximum force is reduced by 87.33% compared to the case where the conventional connector is used.
As can be seen from the above comparative analysis, the first motion compensation device can effectively compensate, release, and relieve the pressure at the second motion compensation device, and the impact of the environmental load on the second motion compensation device 48 as a connector is significantly reduced, thereby improving the stability of the system.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (9)
1. A multi-step motion compensation connection method among a plurality of bodies of an offshore floating photovoltaic system is characterized in that,
the offshore floating photovoltaic system comprises a floating body module, wherein the floating body module comprises:
an upper support configured to carry a solar photovoltaic assembly; and
a lower float configured to support the upper bracket;
the connection method comprises the following steps:
providing at least one first motion compensation device at a junction of the upper bracket and the lower float, the first motion compensation device configured to absorb an impact of an environmental load at the junction of the upper bracket and the lower float; and
at least one second motion compensation device is arranged between the adjacent floating body modules, and the second motion compensation device is configured to be connected with the adjacent floating body modules and absorb the impact of the environmental load acting between the adjacent floating body modules;
wherein at least one first elastic damping element is arranged in the first motion compensation device; the connection method further comprises the steps of:
the lower floating body is provided with a plurality of groups of supporting upright posts, and each group of supporting upright posts is respectively provided with a transverse first motion compensation device and a longitudinal first motion compensation device;
the upper support is provided with a first rod element and a second rod element, and the first rod element and the second rod element respectively penetrate through two adjacent groups of support columns; and
one of the transverse first motion compensation device and the longitudinal first motion compensation device is arranged to penetrate through the outer side of the first rod element, the other one of the transverse first motion compensation device and the longitudinal first motion compensation device is arranged to penetrate through the outer side of the second rod element, and the extending directions of the first elastic damping elements in the transverse first motion compensation device and the first elastic damping elements in the longitudinal first motion compensation device are perpendicular to each other.
2. The method for connecting the offshore floating photovoltaic system with the multistep motion compensation according to claim 1, characterized in that the offshore floating photovoltaic system comprises a plurality of floating body modules, and the plurality of floating body modules are distributed in an equidistant array; the plurality of floating body modules comprise a plurality of constraint floating body modules, and the constraint floating body modules are connected with the adjacent floating body modules through second motion compensation devices and connected with anchoring devices through mooring devices.
3. The offshore floating photovoltaic system multi-interbody multi-step motion compensation connection method of claim 1, further comprising the steps of:
the upper support is provided with a body, the body comprises a plurality of groups of support rods, the support rods are uniformly distributed at equal intervals, and an installation position for installing the solar photovoltaic panel is formed between any two groups of support rods;
arranging the upper bracket with an extension guardrail surrounding the body; and
the support post and the extension guardrail are connected through a first rod element and a second rod element respectively.
4. The offshore floating photovoltaic system multi-interbody multi-step motion compensation connection method according to claim 1, wherein at least one second elastic damping element is arranged in the second motion compensation device; the connection method further comprises the steps of:
arranging a first end of a second motion compensation device to be hinged with an upper bracket of one of two adjacent floating body modules;
arranging a second end part of the second motion compensation device to be hinged with the upper bracket of the other of the two adjacent floating body modules; and
and a second elastic damping element is arranged in one of the first end part and the second end part, and a translation element is arranged in the other end part and penetrates through the second elastic damping element.
5. The offshore floating photovoltaic system multi-interbody multi-step motion compensation connection method of claim 4, further comprising the steps of:
and arranging a solar photovoltaic panel bus cable along the extending direction of the second motion compensation device.
6. The offshore floating photovoltaic system multi-interbody multi-step motion compensation connection method of claim 5, further comprising the steps of:
and fixing the bus cable on one side of the second motion compensation device through a buckle.
7. The offshore floating photovoltaic system multi-interbody multi-step motion compensation connection method according to claim 1, further comprising the steps of:
an inverter is disposed above the upper bracket.
8. The offshore floating photovoltaic system multi-interbody multi-step motion compensation connection method according to claim 1, further comprising the steps of:
and the dynamic parameters of the first motion compensation device are set according to the marine environment conditions of the service sea area of the offshore floating photovoltaic system.
9. The offshore floating photovoltaic system multi-interbody multi-step motion compensation connection method according to claim 1, further comprising the steps of:
the dynamic parameters of the second motion compensation device are set according to the set number of the floating body modules, the set number of the second motion compensation devices and the material strength.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210141679.0A CN114620194B (en) | 2022-02-16 | 2022-02-16 | Multi-step motion compensation connection method between multiple bodies of offshore floating type photovoltaic system |
| PCT/CN2022/100769 WO2023155355A1 (en) | 2022-02-16 | 2022-06-23 | Inter-multi-body multi-step motion compensation connection method for offshore floating photovoltaic system |
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| CN202210141679.0A CN114620194B (en) | 2022-02-16 | 2022-02-16 | Multi-step motion compensation connection method between multiple bodies of offshore floating type photovoltaic system |
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| CN114620194B (en) * | 2022-02-16 | 2023-03-21 | 中国海洋大学 | Multi-step motion compensation connection method between multiple bodies of offshore floating type photovoltaic system |
| CN116552722A (en) * | 2022-07-28 | 2023-08-08 | 大连理工大学 | Floating system for transporting photovoltaic floating device of offshore floating photovoltaic system |
| CN116221262A (en) * | 2022-11-15 | 2023-06-06 | 青岛大学 | Damping connector |
| CN115465421B (en) * | 2022-11-15 | 2023-03-10 | 青岛大学 | Offshore photovoltaic system |
| CN116232183B (en) * | 2023-03-03 | 2023-10-24 | 武汉鑫誉金天科技有限公司 | Solar cell frame |
| CN117220577B (en) * | 2023-09-26 | 2024-03-05 | 同景新能源科技(江山)有限公司 | Marine showy photovoltaic support |
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