CN118611108A - A gravity energy storage system based on wind turbine tower height - Google Patents

Abstract

The present invention relates to the field of energy storage technology, and discloses a gravity energy storage system based on the height of a wind turbine tower, comprising a stand unit, a wind power generation unit, a counterweight unit and a lifting unit. The gravity energy storage system is constructed by taking advantage of the height of the wind turbine to achieve effective absorption of wind turbine power generation during peak and valley periods of the power grid and effective supplementation of electric energy during valley periods of the power grid, and unused wind energy is stored in the form of gravitational potential energy. When the power grid needs power supply, the power grid is charged by releasing heavy objects, which can play a role in peak shaving and valley filling of electric energy in the process of grid-connected power generation of new energy. The product realizes mechanical energy storage based on the height of traditional wind turbines, and utilizes wind energy when the power grid does not need wind power generation, and stores unused wind energy in the form of gravitational potential energy. When the power grid needs power supply, the power grid is charged by releasing heavy objects.

Description

A gravity energy storage system based on wind turbine tower height

Technical Field

The present invention relates to the field of energy storage technology, and in particular to a gravity energy storage system based on the height of a wind turbine tower.

Background Art

As a physical energy storage technology, gravity energy storage has the characteristics of flexible site selection and no pollution, and has received more and more widespread attention in recent years. By building a gravity energy storage system with the help of the height of the wind turbine, the wind turbine power generation can be effectively absorbed during the peak and valley periods of the power grid, and the electricity can be effectively supplemented during the valley period of the power grid. The unused wind energy is stored in the form of gravitational potential energy, and when the power grid needs electricity supply, the power grid is charged by releasing heavy objects. Therefore, building a gravity energy storage system for wind turbines will become an important direction for optimizing wind power generation.

Traditional power generation can only generate electricity but cannot store it. It still needs to adjust the power supply to match the power changes on the demand side to maintain the balance between power supply and demand. However, the output time and load of wind power cannot match the power consumption time and load. The uncontrollable and short-cycle fluctuation instability of wind power will not only lead to wind and power abandonment, but also threaten the stability and security of the power grid.

Therefore, building a gravity energy storage system for wind turbines will become an important direction for optimizing wind power generation.

Summary of the invention

The present invention provides a gravity energy storage system based on the height of a wind turbine tower to solve the problems in the prior art.

The technical problem solved by the present invention is achieved by adopting the following technical solutions:

A gravity energy storage system based on the height of a wind turbine tower, comprising:

A bench unit, the bench unit comprising a support frame and a base seat fixedly welded to the upper end of the support frame;

A wind power generation unit, the wind power generation unit comprising a generator assembly mounted on the base and a transmission assembly connected to the generator assembly, one end of the transmission assembly being mounted with a wind blade;

Counterweight unit;

A lifting unit, the lifting unit includes a lifting drive assembly installed on the base seat and a linkage assembly connected to the lifting drive assembly, the linkage assembly is connected to the transmission assembly of the wind power generation unit, and a counterweight unit is connected to the rotating shaft of the lifting drive assembly.

In a specific embodiment, the support frame includes a support base and a support frame rod fixedly welded to the support base;

The base seat comprises a table plate fixedly welded to the upper end of the support frame rod and a cover shell detachably mounted on the table plate.

In a specific embodiment, the generator assembly includes a generator mounted on the platform, and a rectifier, a bidirectional active front-end rectifier, a DC bus capacitor and a charge-discharge module are also electrically connected and mounted on the generator;

A bidirectional active front end rectifier is connected to the AC source and a DC bus capacitor provides an interface between the rectifier and the voltage source inverter.

In a specific embodiment, the transmission assembly includes a first clutch shaft separator connected to the shaft end of the generator, the other end of the first clutch shaft separator is connected to the transmission shaft, the other end of the transmission shaft is connected to a first gear transmission case, the shaft end of the first gear transmission case is connected to a second clutch shaft separator, and the other end of the second clutch shaft separator is connected to the shaft end of the fan blade.

In a specific embodiment, the lifting drive assembly includes a permanent magnet synchronous motor fixedly mounted on the table and a third electric clutch shaft separator connected to the shaft end of the permanent magnet synchronous motor, the other end of the third electric clutch shaft separator is connected to the shaft end of the second gear transmission, the other end of the second gear transmission is connected to a rotating shaft, and the rotating shaft is connected to a linkage assembly.

In a specific implementation, the linkage assembly includes a driving wheel A fixedly mounted on the rotating shaft and a driven wheel B fixedly mounted on the transmission shaft, and a hinge is connected between the driving wheel A and the driven wheel B.

In a specific embodiment, the counterweight unit includes a reinforced concrete block and a cable connected to the reinforced concrete block, and the upper end of the cable is fixed to the rotating shaft.

In a specific embodiment, a battery is detachably installed in the reinforced concrete block, and a buffer portion is provided at the lower end of the reinforced concrete block.

In a specific embodiment, the buffer portion includes a spring and a buffer plate, the spring is connected to the lower end surface of the reinforced concrete block, and the buffer plate is fixedly connected to the spring.

The present invention has the following beneficial effects:

Taking into account the effective conversion of gravitational potential energy to electrical energy during the release of heavy objects, the wind turbine main shaft is effectively driven by the coordination of a gear set and a hinge, realizing the concept of replacing the original wind energy drive as a power source with gravitational potential energy, completing the high-speed drive of the wind turbine generator rotor, and realizing the effective conversion of gravitational potential energy to electrical energy.

By taking advantage of the height of the wind turbine to build a gravity energy storage system, it is possible to effectively absorb the wind turbine power generation during peak and valley periods of the power grid and effectively supplement the electricity during low periods of the power grid. The unused wind energy is stored in the form of gravitational potential energy. When the power grid needs electricity, the power grid can be charged by releasing heavy objects.

The use of gravity energy storage technology combined with wind power generation can convert excess electrical energy into potential energy and store it when the wind is sufficient, and release the stored energy when the wind weakens or stops, thereby maintaining the stability of power supply. This gravity energy storage system can act as a buffer for the wind power generation system, balancing the demand and supply in the power network, effectively solving the intermittent problem of wind power, and improving the stability of power supply.

Through the gravity energy storage system, wind farms can convert wind energy into electrical energy and store it, so that large-scale electricity storage can be carried out when there is sufficient wind power. At the same time, it reduces dependence on traditional energy, reduces carbon emissions, helps to achieve the transformation and upgrading of energy structure, and promotes the sustainable development of clean energy.

Gravity energy storage technology utilizes the height of the wind turbine itself and existing equipment, avoiding the need for additional infrastructure and land, and significantly reducing system construction costs. At the same time, by optimizing the energy storage device and utilizing the lifting equipment inside the wind turbine, investment and operating costs are further reduced.

Gravity energy storage technology can improve the energy utilization efficiency of wind power systems, convert wind energy into electrical energy and store it to balance the fluctuations between power supply and demand, thereby improving the economic benefits of the system. Therefore, the low cost and high efficiency of gravity energy storage technology make it an ideal choice for wind power systems, bringing important impetus to the development of the clean energy field.

Based on the above, this product can play the role of peak shaving and valley filling in the process of renewable energy grid-connected power generation. The product realizes mechanical energy storage based on the height of traditional wind turbines, and utilizes wind energy when the grid does not need wind power generation, and stores the unused wind energy in the form of gravitational potential energy. When the grid needs electricity supply, the grid is charged by releasing heavy objects.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

FIG1 is a schematic diagram of the overall structure of the present invention.

FIG. 2 is a top view of the wind power generation unit and the lifting unit of the present invention.

FIG3 is a schematic diagram of the structure of the wind power generation unit and the lifting unit of the present invention.

FIG. 4 is a schematic diagram of the structure of the generator assembly, the transmission assembly and the linkage assembly of the present invention.

FIG. 5 is a schematic structural diagram of a gantry unit and a counterweight unit according to the present invention.

FIG6 is a system flow chart of the present invention.

FIG. 7 is a system control diagram of the present invention.

In the figure: 100, rack unit; 110, support frame; 111, support base; 112, support frame rod; 120, base seat; 121, table; 122, cover; 200, wind power generation unit; 210, generator assembly; 211, generator; 212, rectifier; 213, bidirectional active front-end rectifier; 214, DC bus capacitor; 215, charge and discharge module; 220, transmission assembly; 221, first clutch shaft separator; 222, transmission shaft; 2 23. First gear transmission box; 224. Second clutch shaft separator; 230. Fan blade; 300. Counterweight unit; 310. Reinforced concrete block; 311. Battery; 320. Cable; 400. Lifting unit; 410. Lifting drive assembly; 411. Permanent magnet synchronous motor; 412. Third clutch shaft separator; 413. Second gear transmission box; 414. Rotating shaft; 420. Linkage assembly; 421. Driving wheel A; 422. Driven wheel B; 423. Hinge.

DETAILED DESCRIPTION

In order to make the purpose, technical solutions and advantages of the implementation methods of this application clearer, the technical solutions in the implementation methods of this application will be clearly and completely described below in conjunction with the drawings in the implementation methods of this application. Obviously, the described implementation methods are part of the implementation methods of this application, not all of the implementation methods. Based on the implementation methods in this application, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not require further definition and explanation in the subsequent drawings.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

1-7, the present invention provides a gravity energy storage system based on the height of a wind turbine tower, comprising:

The stand unit 100 includes a support frame 110 and a base seat 120 fixedly welded to the upper end of the support frame 110;

A wind power generation unit 200, the wind power generation unit 200 comprises a generator assembly 210 mounted on a base 120 and a transmission assembly 220 connected to the generator assembly 210, and a fan blade 230 is mounted on one end of the transmission assembly 220;

Counterweight unit 300;

The lifting unit 400 includes a lifting drive assembly 410 installed on the base seat 120 and a linkage assembly 420 connected to the lifting drive assembly 410. The linkage assembly 420 is connected to the transmission assembly 220 of the wind power generation unit 200. The counterweight unit 300 is connected to the rotating shaft of the lifting drive assembly 410.

As a further preferred embodiment of the above embodiment, the support frame 110 includes a support base 111 and a support frame rod 112 fixedly welded to the support base 111;

The base 120 includes a table plate 121 fixedly welded to the upper end of the support frame rod 112 and a cover shell 122 detachably mounted on the table plate 121 .

As a further preferred embodiment of the above embodiment, the generator assembly 210 includes a generator 211 installed on the platform 121, and the generator 211 is also electrically connected to a rectifier 212, a bidirectional active front-end rectifier 213, a DC bus capacitor 214 and a charge-discharge module 215;

The bidirectional active front end rectifier 213 is connected to the AC power source, and the DC bus capacitor 214 provides an interface between the rectifier 212 and the voltage source inverter.

As a further preference of the above embodiment, the transmission assembly 220 includes a first clutch shaft separator 221 connected to the shaft end of the generator 211, the other end of the first clutch shaft separator 221 is connected to the transmission shaft 222, the other end of the transmission shaft 222 is connected to the first gear transmission case 223, the shaft end of the first gear transmission case 223 is connected to a second clutch shaft separator 224, and the other end of the second clutch shaft separator 224 is connected to the shaft end of the fan blade 230.

As a further preference of the above embodiment, the lifting drive assembly 410 includes a permanent magnet synchronous motor 411 fixedly mounted on the table 121 and a third electric clutch shaft separator 412 connected to the shaft end of the permanent magnet synchronous motor 411, the other end of the third electric clutch shaft separator 412 is connected to the shaft end of the second gear transmission case 413, the other end of the second gear transmission case 413 is connected to a rotating shaft 414, and the rotating shaft 414 is connected to a linkage assembly 420.

The linkage assembly 420 includes a driving wheel A421 fixedly mounted on the rotating shaft 414 and a driven wheel B422 fixedly mounted on the transmission shaft 222 , and a hinge 423 is connected between the driving wheel A421 and the driven wheel B422 .

As a further preferred embodiment of the above embodiment, the counterweight unit 300 includes a reinforced concrete block 310 and a cable 320 connected to the reinforced concrete block 310 , and the upper end of the cable 320 is fixed on the rotating shaft 414 .

A battery 311 is detachably installed in the reinforced concrete block 310 , and a buffer portion is provided at the lower end of the reinforced concrete block 310 .

The buffer part includes a spring and a buffer plate. The spring is connected to the lower end surface of the reinforced concrete block 310, and the buffer plate is fixedly connected to the spring.

As a further preferred embodiment of the above embodiment, a limit system is provided on the counterweight unit 300, and the limit system is a hydraulic locking device in the existing prior art. A limit plate is connected to the telescopic end of the hydraulic telescopic cylinder, and the hydraulic telescopic cylinder is installed on the lower end surface of the platform 121. A pressure pedal switch is also installed on the lower end surface of the platform 121. The pressure pedal switch controls the hydraulic telescopic cylinder. The permanent magnet synchronous motor 411 drives the rotating shaft 414 to rotate and then pulls up the cable 320, so that the reinforced concrete block 310 is pulled up. After the reinforced concrete block 310 is pulled up to the position, the position of the reinforced concrete block 310 is fixed by the limit system. When the reinforced concrete block 310 needs to fall, the limit system releases the reinforced concrete block 310. When fixing, the telescopic end of the hydraulic telescopic cylinder drives the limit plate to extend to the bottom of the reinforced concrete block 310 to lift and fix the reinforced concrete block 310. When releasing, the telescopic end of the hydraulic telescopic cylinder drives the limit plate to retract.

The invention has two operating modes. Mode 1 is when the wind resource intensity does not reach the intensity required by the power grid, the electromagnetic clutch is closed, the fan shaft is connected to the energy storage shaft, and the electricity generated by the fan is stored in the heavy object battery; Mode 2 is when the wind resource intensity reaches the intensity required by the power grid, but there is no demand for electricity connection to the grid side, gravity energy storage is performed, and the system lifts the heavy objects through a permanent magnet synchronous motor.

When the system is in mode 2, the fan blades and the fan low-speed shaft are separated under the control of the electromagnetic clutch, the weight drives the cable brake by falling, and the low-speed shaft of the fan is driven and separated under the control of the electromagnetic clutch without being connected to the fan blade shaft through the pulley.

The use of gravity energy storage technology combined with wind power generation can convert excess electrical energy into potential energy and store it when the wind is sufficient, and release the stored energy when the wind weakens or stops, thereby maintaining the stability of power supply. This gravity energy storage system can act as a buffer for the wind power generation system, balancing the demand and supply in the power network, effectively solving the intermittent problem of wind power, and improving the stability of power supply.

Through the gravity energy storage system, wind farms can convert wind energy into electrical energy and store it, so that large-scale electricity storage can be carried out when there is sufficient wind power. At the same time, it reduces dependence on traditional energy, reduces carbon emissions, helps to achieve the transformation and upgrading of energy structure, and promotes the sustainable development of clean energy.

Gravity energy storage technology utilizes the height of the wind turbine itself and existing equipment, avoiding the need for additional infrastructure and land, and significantly reducing system construction costs. At the same time, by optimizing the energy storage device and utilizing the lifting equipment inside the wind turbine, investment and operating costs are further reduced.

6-7, a control process of a gravity energy storage system based on the height of a wind turbine tower is as follows:

After the voltage and current sensor signals are transmitted to the grid dispatching center for comparison, if they are less than the maximum grid-connected power generation, the grid issues a control command to control the limit system, so that the limit device controls the limit plate to retract and the weight (counterweight unit 300) falls.

This in turn drives the transmission shaft to rotate, and then after being accelerated by the gearbox, high-speed transmission is achieved to the driving wheel A. The driving wheel A drives the driven wheel B to rotate at high speed through the hinge, thereby achieving transmission to the fan main shaft.

The fan main shaft then passes through the original fan's gearbox to drive the generator shaft to rotate, realizing motor power generation. The fan gravity energy storage is started, and the generated current passes through the original fan's transformer and converter to collect electrical energy into the power grid.

After the voltage and current sensor signals are transmitted to the power grid dispatching center for comparison, if they are greater than the maximum grid-connected power generation, the control command triggers the motor power supply circuit switch, allowing the motor flywheel to lift the heavy object through the planetary gear set, rotating shaft and other mechanisms.

A heavy object presses the pressure pedal, and the pressure pedal drives the release fork through the limit system, which in turn drives the release bearing to complete the squeezing of the diaphragm spring and thus realize the separation of the friction disc and the motor flywheel (the release fork, release bearing, diaphragm spring, and friction disc are components of the clutch shaft separator), and the fan gravity energy storage stops.

When the grid has sufficient energy, the grid provides electrical energy to the motor, which rotates at high speed to pull the lifting equipment, thereby driving the heavy objects upward and completing the conversion of electrical energy and potential energy.

When the grid energy is insufficient, the heavy object is released and drops at high speed, causing the heavy object to brake the cable, thereby driving the rotor to rotate at high speed. Through the gear transmission, the high-speed rotation of the generator rotor is driven. The rotor cuts the magnetic lines of flux, and the generated current returns to the grid through the inverter, realizing the effective conversion between potential energy and electrical energy.

The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims (9)

1. A gravity energy storage system based on fan tower height, comprising:

A rack unit (100), wherein the rack unit (100) comprises a support frame (110) and a base seat (120) fixedly welded at the upper end of the support frame (110);

The wind power generation unit (200), the wind power generation unit (200) comprises a generator component (210) arranged on the base seat (120) and a transmission component (220) connected to the generator component (210), and one end of the transmission component (220) is provided with a fan blade (230);

A counterweight unit (300);

the lifting unit (400), the lifting unit (400) comprises a lifting driving component (410) installed on the base seat (120) and a linkage component (420) connected to the lifting driving component (410), the linkage component (420) is connected with a transmission component (220) of the wind power generation unit (200), and a rotating shaft of the lifting driving component (410) is connected with the counterweight unit (300).

2. The gravity energy storage system based on a height of a wind turbine tower of claim 1, wherein: the support frame (110) comprises a support base (111) and a support frame rod (112) fixedly welded on the support base (111);

The base seat (120) comprises a bedplate (121) fixedly welded at the upper end of the support frame rod (112) and a cover shell (122) detachably arranged on the bedplate (121).

3. A gravity energy storage system based on fan tower height according to claim 2, wherein: the generator assembly (210) comprises a generator (211) arranged on the bedplate (121), and the generator (211) is further electrically connected with a rectifier (212), a bidirectional active front-end rectifier (213), a direct-current bus capacitor (214) and a charging and discharging module (215);

The bi-directional active front end rectifier (213) is connected to an ac power source, and the dc bus capacitor (214) provides an interface between the rectifier (212) and the voltage source inverter.

4. A gravity energy storage system based on fan tower height according to claim 3 wherein: the transmission assembly (220) comprises a first electric clutch shaft separator (221) connected with the shaft end of the generator (211), the other end of the first electric clutch shaft separator (221) is connected with a transmission shaft (222), the other end of the transmission shaft (222) is connected with a first gear box (223), the shaft end of the first gear box (223) is connected with a second electric clutch shaft separator (224), and the other end of the second electric clutch shaft separator (224) is connected with the shaft end of the fan blade (230).

5. The gravity energy storage system based on a height of a wind turbine tower of claim 4, wherein: the lifting driving assembly (410) comprises a permanent magnet synchronous motor (411) fixedly installed on the bedplate (121) and a third electric clutch shaft separator (412) connected with the shaft end of the permanent magnet synchronous motor (411), the other end of the third electric clutch shaft separator (412) is connected to the shaft end of the second gear box (413), the other end of the second gear box (413) is connected with a rotating shaft (414), and the rotating shaft (414) is connected with the linkage assembly (420).

6. The gravity energy storage system based on a height of a wind turbine tower of claim 5, wherein: the linkage assembly (420) comprises a driving wheel A (421) fixedly installed on the rotating shaft (414) and a driven wheel B (422) fixedly installed on the transmission shaft (222), and a hinge (423) is connected between the driving wheel A (421) and the driven wheel B (422).

7. The gravity energy storage system based on a height of a wind turbine tower of claim 6, wherein: the weight unit (300) includes a reinforced concrete block (310) and a cable (320) connected to the reinforced concrete block (310), and an upper end of the cable (320) is fixed to the rotation shaft (414).

8. The gravity energy storage system based on a height of a wind turbine tower of claim 7, wherein: the storage battery (311) is detachably arranged in the reinforced concrete block (310), and a buffer part is arranged at the lower end of the reinforced concrete block (310).

9. The gravity energy storage system based on a height of a wind turbine tower of claim 8, wherein: the buffer part comprises a spring and a buffer plate, the spring is connected to the lower end face of the reinforced concrete block (310), and the buffer plate is fixedly connected to the spring.