A distributed buoyancy energy storage device

Abstract

The application discloses a distributed buoyancy energy storage device, which comprises a buoyancy energy storage unit, a plurality of buoyancy energy storage units are distributed on a plurality of wind turbines to form a distributed energy storage, the buoyancy energy storage unit comprises a first floating body module, a second floating body module, a wheel rim motor, a wheel-shaped storage track and a vertical track, a plurality of vertical tracks are circumferentially distributed on a wind turbine tower, a first floating body module is slidably installed on each vertical track, and a wheel rim motor is installed on each first floating body module, and the upper portion and the lower portion of the wind turbine tower are rotatably provided with wheel-shaped storage tracks, a plurality of second floating body modules are distributed on one of the wheel-shaped storage tracks, and each second floating body module can simultaneously float and dive together with the corresponding first floating body module, electric energy is converted into buoyancy potential energy when the first floating body module and the second floating body module dive together, and the buoyancy potential energy is converted into electric energy when the first floating body module and the second floating body module float together.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of offshore wind power energy storage, and particularly relates to a distributed buoyancy energy storage device. BACKGROUND

[0002] With the rapid development of the new energy industry, the construction of power source network load storage integration and multi-energy complementary new energy system provides strong support for energy structure adjustment and industrial structure optimization and upgrading. Supporting the reasonable configuration of distributed new energy storage systems and fully playing the role of peak shaving and frequency modulation of the storage system are of great significance for improving energy utilization and maximizing benefits.

[0003] Offshore wind power has the characteristics of volatility, intermittency and irregularity due to climate and season, and is highly dependent on natural environmental conditions, which makes it difficult to balance power, and puts forward higher requirements for the energy storage of offshore wind power. Traditional energy storage methods, such as electrochemical energy storage and pumped storage, have problems such as high investment cost, difficulty in implementation, and great impact on the marine environment. Buoyancy energy storage is a new type of energy storage technology that converts energy between electrical energy and buoyancy potential energy to complete energy storage and release, and has the advantages of high economy, simple structure and better adaptation to marine environment.

[0004] The application number 202210782241.0 discloses a buoyancy energy storage device using a reservoir, which includes a power generation motor, a winch and an upper pulley arranged on the reservoir bank platform, and a lower pulley arranged at the bottom of the reservoir. The extension and retraction of the steel cable realize the floating and sinking of the floating body, and then realize the mutual conversion of electrical energy and buoyancy potential energy. However, this device not only needs to build an additional energy storage platform, resulting in high investment cost, but also has problems such as large occupation of marine area and impact on marine ecological environment. SUMMARY

[0005] In view of the deficiencies of the prior art, the technical problem to be solved by the present application is to provide a distributed buoyancy energy storage device.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0007] A distributed buoyancy energy storage device, comprising a buoyancy energy storage unit; characterized in that a plurality of buoyancy energy storage units are distributed on a plurality of wind turbine generators to form a distributed energy storage.

[0008] The buoyancy energy storage unit comprises a first floating body module, a second floating body module, a wheel rim motor, a wheel-shaped storage track and a vertical track; a plurality of vertical tracks are circumferentially distributed on the fan tower drum, each vertical track is slidably installed with a first floating body module, and each first floating body module is installed with a wheel rim motor; the upper part and the lower part of the fan tower drum are rotatably installed with wheel-shaped storage tracks, one of which is distributed with a plurality of second floating body modules, the second floating body modules can reciprocatingly slide on the wheel-shaped storage track, and each second floating body module can simultaneously upfloat and dive together with the corresponding first floating body module; when the first floating body module and the second floating body module dive together, electric energy is converted into buoyancy potential energy to realize energy storage; when the first floating body module and the second floating body module upfloat together, the buoyancy potential energy is converted into electric energy to realize energy release.

[0009] Further, the first floating body module comprises a first annular fixing member and a plurality of first floating bodies which are circumferentially and uniformly distributed on the first annular fixing member; the wheel rim motor is connected with the first annular fixing member, and the wheel rim motor is slidably connected with the vertical track through a support, so that the first floating body module can reciprocatingly slide along the vertical track.

[0010] Further, the second floating body module comprises a second annular fixing member and a plurality of second floating bodies which are circumferentially and uniformly distributed on the second annular fixing member.

[0011] Further, the wheel-shaped storage track comprises a connecting ring and a connecting rod; the connecting ring is rotatably connected with the fan tower drum, a plurality of vertical connecting rods are uniformly distributed around the connecting ring, at least one second floating body of the second floating body module is connected with the connecting rod, the second floating body module can reciprocatingly slide on the connecting rod and be fixed with the connecting rod.

[0012] Further, the operation of the device is divided into two stages of energy storage and energy release; in the energy storage stage, the wheel-shaped storage track at the upper part of the fan tower drum is rotated, so that each second floating body module on the wheel-shaped storage track at the upper part of the fan tower drum is located below the corresponding first floating body module, the second floating body module on the wheel-shaped storage track at the upper part of the fan tower drum is released, the second floating body module upfloats under the action of buoyancy and separates from the wheel-shaped storage track, and is adsorbed together with the corresponding first floating body module; the wheel rim motor is connected with the power supply, the impeller of the wheel rim motor rotates to generate a thrust force to make the first floating body module and the second floating body module dive together, the second floating body module is transported to the wheel-shaped storage track at the lower part of the fan tower drum and is fixed with the wheel-shaped storage track, electric energy is converted into buoyancy potential energy, and the wheel rim motor is disconnected with the power supply; in the energy release stage, the second floating body module on the wheel-shaped storage track at the lower part of the fan tower drum is released, the second floating body module upfloats under the action of buoyancy and separates from the wheel-shaped storage track, and is adsorbed together with the corresponding first floating body module, the first floating body module and the second floating body module upfloat together under the action of buoyancy, the impeller of the wheel rim motor rotates to generate an induced current, and the buoyancy potential energy is converted into electric energy.

[0013] Compared with the prior art, the application has the following advantages:

[0014] 1. The application is based on a fan tower drum, and multiple buoyancy energy storage units are distributedly constructed on each wind turbine generator of an offshore wind farm to form distributed energy storage, and the total energy storage capacity is strong; the single buoyancy energy storage unit has small floor area and low investment cost, and does not need to build an offshore energy storage platform.

[0015] 2. The rim motor is combined with the first floating body module into an integral whole, the first floating body module plays a role of transporting the second floating body module, when the power generation of the offshore wind turbine generator is greater than the power consumption load, the rim motor is connected to the power supply to drive the first floating body module and the second floating body module to dive together, the surplus electric energy is converted into potential energy of buoyancy for storage, and energy storage is completed; when the power generation of the offshore wind turbine generator is less than the power consumption load, the second floating body module is released by the wheel-shaped storage track, the first floating body module and the rim motor are floated together, the impeller of the rim motor rotates to generate induced current, the potential energy of buoyancy is converted into electric energy, and energy release is completed. Therefore, the device can store energy under the condition that the power consumption load is small and the offshore wind power is sufficient, realize peak shaving and frequency modulation of the offshore wind power generation system, improve energy utilization efficiency, and minimize the comprehensive wind and light storage power generation cost.

[0016] 3. The single column type, semi-submersible type and tension leg type offshore wind turbine can be improved according to the demand, the buoyancy energy storage unit is integrally constructed with the wind turbine tower drum to adapt to different offshore wind turbines. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a whole structure diagram;

[0018] Figure 2 is a structure diagram of the first floating body module and the second floating body module being adsorbed together;

[0019] Figure 3 is a structure diagram of the first floating body module;

[0020] Figure 4 is a structure diagram of the rim motor;

[0021] Figure 5 is a structure diagram of the V-shaped support;

[0022] Figure 6 is a structure diagram of the second floating body module;

[0023] Figure 7 is a connection diagram of the second floating body module and the wheel-shaped storage track;

[0024] Figure 8 is a structure diagram of the wheel-shaped storage track;

[0025] Figure 9 Structure diagram of vertical track;

[0026] Reference signs: 1, first floating body module; 2, second floating body module; 3, rim motor; 4, wheel-shaped storage track; 5, vertical track; 6, fan tower; 7, V-shaped support;

[0027] 101, first floating body; 102, first annular fixing member; 201, second floating body; 202, second annular fixing member; 401, connecting ring; 402, connecting rod; 501, vertical track body; 502, support truss. DETAILED DESCRIPTION

[0028] The specific embodiments are described below in conjunction with the drawings, which are only used to specifically introduce the technical solutions of the present application, and do not limit the protection scope of the present application.

[0029] The present application is a kind of distributed buoyancy energy storage device (referred to as device, see Figures 1-9 ), comprising a plurality of buoyancy energy storage units, each wind turbine in an offshore wind farm is installed with a buoyancy energy storage unit, forming a distributed buoyancy energy storage;

[0030] The buoyancy energy storage unit comprises a first floating body module 1, a second floating body module 2, a hub motor 3, a wheel-shaped storage track 4 and a vertical track 5; a plurality of vertical tracks 5 are uniformly distributed in a circle on a fan tower 6, the vertical tracks 5 are arranged along the axial direction of the fan tower 6, one first floating body module 1 is slidably installed on each vertical track 5, one hub motor 3 is installed on each first floating body module 1, the first floating body module 1 is slid downward along the vertical track 5 by the hub motor 3, and the submersion of the first floating body module 1 is realized; two wheel-shaped storage tracks 4 are rotatably installed at the upper and lower parts of the fan tower 6, the wheel-shaped storage track 4 at the upper part of the fan tower 6 is not higher than the lowest sea level position and is always below the sea level, the wheel-shaped storage track 4 at the lower part of the fan tower 6 is located at a relatively stable position on the upper part of the seabed; at least one second floating body module group is installed on one wheel-shaped storage track 4, the second floating body module group is composed of a plurality of second floating body modules 2 which are distributed in a circle on the wheel-shaped storage track 4, the second floating body modules 2 can reciprocally slide on the wheel-shaped storage track 4 and can be fixed together with the wheel-shaped storage track 4, after the wheel-shaped storage track 4 rotates by a certain angle, each first floating body module 1 has a corresponding second floating body module 2, so that the first floating body module 1 and the corresponding second floating body module 2 are adsorbed and then submerge or float together; after the first floating body module 1 and the second floating body module 2 at the upper part of the fan tower 6 are adsorbed, the hub motor 3 is connected to the power supply, the impeller of the hub motor 3 rotates to generate a thrust to push the first floating body module 1 and the second floating body module 2 to slide downward along the vertical track 5, so that the first floating body module 1 and the second floating body module 2 submerge together, the second floating body module 2 is transported to the wheel-shaped storage track 4 at the lower part of the fan tower 6 for storage, and the storage of buoyancy potential energy is realized.

[0031] As shown in Figure 3 , the first floating body module 1 comprises a first floating body 101 and a first annular fixing member 102; a plurality of first floating bodies 101 are uniformly distributed in a circle on the first annular fixing member 102, the hub motor 3 is fixed on the first annular fixing member 102, the hub motor 3 is slidably connected to the vertical track 5 through a V-shaped support 7, the middle part of the V-shaped support 7 is fixedly connected to the outer wall of the hub motor 3, the two ends of the V-shaped support 7 are respectively provided with rollers, the rollers are slidably connected to the sliding grooves on the two sides of the vertical track 5, the reciprocating sliding of the first floating body module 1 on the vertical track 5 is realized, and the floating and submersion of the first floating body module 1 are realized, as shown in Figure 4 、 5 . Further, the plurality of first floating bodies 101 of the first floating body module 1 are of different sizes, so as to balance the overall gravity center of the first floating body module 1 and the hub motor 3 fixed together, and reduce the sliding friction between the first floating body module 1 and the vertical track 5.

[0032] As shown in Figure 6As shown, the second floating body module 2 comprises a second floating body 201 and a second annular fixing member 202, and a plurality of second floating bodies 201 are uniformly distributed on the second annular fixing member 202 in a circle; the second floating body module 2 is attached to the first floating body module 1 by electromagnetic attraction.

[0033] As shown in Figure 7 , 8 As shown, the wheel-shaped storage track 4 comprises a connecting circular ring 401 and a connecting rod 402; the connecting circular ring 401 is rotationally connected with the fan tower 6, and the rotation connection mode includes but is not limited to gear transmission; a plurality of vertical connecting rods 402 are uniformly distributed around the connecting circular ring 401, at least one second floating body 201 of the second floating body module 2 is sleeved on one of the connecting rods 402, the second floating body module 2 can reciprocally slide along the connecting rod 402 and is fixed with the connecting rod 402, and the fixing mode of the second floating body 201 with the connecting rod 402 includes but is not limited to electromagnetic attraction.

[0034] As shown in Figure 9 , the vertical track 5 comprises a vertical track body 501 and a support truss 502; the vertical track body 501 is fixedly connected with the fan tower 6 through the support truss 502, the support truss 502 serves as a support structure of the vertical track 5 and plays a role of a stabilizing device, and the two sides of the vertical track body 501 are respectively provided with sliding grooves slidably connected with the two ends of the V-shaped support 7.

[0035] The outer shell of the first floating body 101 and the second floating body 201 is made of low-resistance hard material, such as carbon fiber, and the first floating body 101 and the second floating body 201 can use recycled marine garbage as internal support. The outer surfaces of the vertical track 5, the wheel-shaped storage track 4, the first floating body module 1 and the second floating body module 2 can be sprayed with inorganic or organic anticorrosive coating and coated with anticorrosive coating by hot-dip galvanizing and the like.

[0036] The rim motor 3 is a permanent magnet rim motor, in the energy storage stage, the rim motor 3 is connected with power supply, at this time, the rim motor 3 is equivalent to a propeller, the impeller of the rim motor 3 rotates to generate thrust, which pushes the first floating body module 1 and the second floating body module 2 located at the upper part of the fan tower 6 to dive together, transports the second floating body module 2 at the upper part to the wheel-shaped storage track 4 located at the lower part of the fan tower 6 for storage, and fixes the second floating body module 2 with the wheel-shaped storage track 4 by electromagnetic attraction, stores the buoyancy potential energy in the second floating body module 2 located at the lower part of the fan tower 6, and further completes the storage of the buoyancy potential energy; in the energy release stage, the rim motor 3 is disconnected with power supply, the second floating body module 2 located at the lower part of the fan tower 6 releases the stored buoyancy potential energy, and under the action of the buoyancy, the second floating body module 2 and the first floating body module 1 float up together, the impeller of the rim motor 3 rotates to generate induced electromotive force and further generates induced current, converts the buoyancy potential energy into electric energy, and transmits the electric energy to the power grid.

[0037] The working principle and working process of the present application are as follows:

[0038] Initially, each first floating body module 1 floats at the upper part of the corresponding vertical track 5 under the action of buoyancy, each second floating body module 2 is fixed together with the corresponding wheel-shaped storage track 4, and the rim motor 3 is disconnected from the power supply; the operation of the device is divided into two stages of energy storage and energy release;

[0039] In the energy storage stage, first, the wheel-shaped storage track 4 at the upper part of the wind turbine tower 6 is rotated, so that each second floating body module 2 on the wheel-shaped storage track 4 at the upper part of the wind turbine tower 6 is located below the corresponding first floating body module 1, the second floating body module 2 on the wheel-shaped storage track 4 at the upper part of the wind turbine tower 6 is released, the second floating body module 2 is floated under the action of buoyancy to completely separate from the connecting rod 402 of the wheel-shaped storage track 4 and is adsorbed together with the corresponding first floating body module 1; then, the rim motor 3 on the first floating body module 1 is connected to the power supply, the impeller of the rim motor 3 rotates to generate thrust, which pushes the first floating body module 1 and the second floating body module 2 to slide downward along the vertical track 5 together, realizing the submersion of the first floating body module 1 and the second floating body module 2, until the second floating body module 2 is transported to the wheel-shaped storage track 4 at the lower part of the wind turbine tower 6 and is fixed together with the wheel-shaped storage track 4, the rim motor 3 on the first floating body module 1 is disconnected from the power supply, and the storage of buoyancy potential energy is completed;

[0040] In the energy release stage, the second floating body module 2 fixed together with the wheel-shaped storage track 4 at the lower part of the wind turbine tower 6 is released, the second floating body module 2 is floated under the action of buoyancy and is separated from the wheel-shaped storage track 4 at the lower part of the wind turbine tower 6, and is adsorbed together with the corresponding first floating body module 1, both of which slide upward along the vertical track 5 under the action of buoyancy, realizing the floating of the first floating body module 1 and the second floating body module 2, the impeller of the rim motor 3 rotates to generate induced electromotive force and further generates induced current during the floating of the first floating body module 1 and the second floating body module 2, the buoyancy potential energy is converted into electric energy and is transmitted to the power grid, and the release of the buoyancy potential energy is completed.

[0041] The distributed buoyancy energy storage device can be uniformly allocated according to the power generation of the offshore wind turbine generator and the power load, realizing the peak regulation and frequency regulation of the regional offshore wind power system; when the offshore wind is large and the power load is small, the power generation of the offshore wind turbine generator is greater than the power load, the excess electric energy is converted into buoyancy potential energy by driving the rim motor 3 to realize energy storage; when the power load is large and the power generation of the offshore wind turbine generator is less than the power load, the buoyancy potential energy can be released to convert the buoyancy potential energy into electric energy to meet the power load.

[0042] The unmentioned parts of the present application are applicable to the prior art.

Claims

1. A distributed buoyancy energy storage device comprising buoyancy energy storage units; characterized in that, The multiple buoyancy energy storage units are distributed on multiple wind turbines to form a distributed energy storage; The buoyancy energy storage unit comprises a first floating body module, a second floating body module, a wheel rim motor, a wheel-shaped storage track and a vertical track; multiple vertical tracks are circumferentially distributed on a wind turbine tower, each vertical track is slidably installed with a first floating body module, and each first floating body module is installed with a wheel rim motor; the upper and lower portions of the wind turbine tower are respectively rotatably installed with wheel-shaped storage tracks, one of which is distributed with multiple second floating body modules, the second floating body modules are capable of reciprocating sliding on the wheel-shaped storage track, and each second floating body module is capable of floating and diving together with the corresponding first floating body module; when the first floating body module and the second floating body module dive together, electric energy is converted into buoyancy potential energy to realize energy storage; when the first floating body module and the second floating body module float together, the buoyancy potential energy is converted into electric energy to realize energy release; The operation of the device is divided into two stages of energy storage and energy release; in the energy storage stage, the wheel-shaped storage track at the upper portion of the wind turbine tower is rotated, so that each second floating body module on the wheel-shaped storage track at the upper portion of the wind turbine tower is located below the corresponding first floating body module, the second floating body module on the wheel-shaped storage track at the upper portion of the wind turbine tower is released, the second floating body module floats up and separates from the wheel-shaped storage track under the action of buoyancy, and is adsorbed together with the corresponding first floating body module; the wheel rim motor is connected to the power supply, the impeller of the wheel rim motor rotates to generate thrust to make the first floating body module and the second floating body module dive together, the second floating body module is transported to the wheel-shaped storage track at the lower portion of the wind turbine tower and fixed with the wheel-shaped storage track, the electric energy is converted into buoyancy potential energy, and the wheel rim motor is disconnected from the power supply; In the energy release stage, the second floating body module on the wheel-shaped storage track at the lower portion of the wind turbine tower is released, the second floating body module floats up under the action of buoyancy and the wheel-shaped storage track, and is adsorbed together with the corresponding first floating body module, the first floating body module and the second floating body module float together under the action of buoyancy, so that the impeller of the wheel rim motor rotates to generate induced current, and the buoyancy potential energy is converted into electric energy.

2. The distributed buoyancy energy storage device of claim 1, wherein, The first floating body module comprises a first annular fixing member and multiple first floating bodies which are circumferentially and uniformly distributed on the first annular fixing member; the wheel rim motor is connected with the first annular fixing member, and the wheel rim motor is slidably connected with the vertical track through a support, so that the first floating body module can reciprocate along the vertical track.

3. The distributed buoyancy energy storage device of claim 1, wherein, The second floating body module comprises a second annular fixing member and multiple second floating bodies which are circumferentially and uniformly distributed on the second annular fixing member.

4. The distributed buoyancy energy storage device of claim 3, wherein, The wheel-shaped storage track comprises a connecting ring and a connecting rod; the connecting ring is rotatably connected with the wind turbine tower, multiple vertical connecting rods are uniformly distributed around the connecting ring, at least one second floating body of the second floating body module is connected with the connecting rod, and the second floating body module can reciprocate on the connecting rod and be fixed with the connecting rod.

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