Energy storage type power fluctuation smoothing device for generator

Abstract

This invention relates to the field of renewable energy power generation system management technology, and discloses an energy storage-type device for smoothing generator power fluctuations. The device includes a planetary gear set, a cylinder connected to the planetary gear set, ropes wound around the cylinder, and an energy storage structure connected to one end of the ropes. The planetary gear set includes a planet carrier, planetary pinions, a sun gear, and a ring gear. There are at least two ropes, each consisting of a winding section, a separating section, and a connecting section connected sequentially from its starting end to its ending end. The starting end of the rope is fixedly connected to the end of the cylinder connected to the planetary gear set or to the ring gear. The winding sections are wound synchronously and side-by-side around the outside of the cylinder. The separating sections are tangent to the cylinder, and all separating sections are equidistantly distributed along the circumference of the cylinder. This invention, by setting up a planetary gear set, a cylinder, ropes, and an energy storage structure, converts most of the power fluctuations that would normally be borne by the generator into gravitational potential energy for storage or release.

Description

Technical Field

[0001] This invention relates to the field of renewable energy power generation system management technology, and more specifically to an energy storage-type generator power fluctuation smoothing device. Background Technology

[0002] Widely used renewable energy power generation includes wind power and hydropower, while other types of renewable energy power generation are mostly subject to greater limitations. However, wind power is significantly affected by the randomness of wind speed, turbulence intensity, and terrain. Although hydropower is generally more stable, it can also experience short-term fluctuations due to turbulence. These fluctuations cause power fluctuations in the corresponding power generation equipment during operation. The work generated by sudden increases or decreases in power is mainly borne by the generator, which in turn has a multifaceted impact on the power generation equipment, as well as its efficiency and performance. For example, sudden power changes in wind power generation can cause fluctuations in rotor speed, leading to additional mechanical stress on components such as gearboxes and bearings, shortening equipment lifespan; reducing unit efficiency; interfering with generator electromagnetic balance; and affecting power quality. Large-scale power fluctuations may cause grid frequency deviations and voltage flicker, threatening system stability. Variable-speed units need to frequently adjust the pitch angle or slip to maintain power stability, increasing the complexity of the control system and energy consumption. Sudden increases in power can exceed the maximum rated limit of the motor, damaging it.

[0003] Existing technologies mostly address these situations by suppressing fluctuations or reducing their impact, or by using multi-dimensional technological collaboration to mitigate the negative impact of power fluctuations on generators and the power grid. However, none of them consider how to utilize the energy wasted during power fluctuations because the generating equipment cannot convert it into electrical energy in time. Therefore, a device is needed to store the peak power of the fluctuations and release it during the off-peak periods. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an energy storage type generator power fluctuation smoothing device. By setting up a planetary gear set, cylinder, rope and energy storage structure, most of the fluctuating work that would normally be borne by the generator is converted into gravitational potential energy for storage and release. It can also reduce the maximum rated power required by the motor.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an energy storage type smoothing generator power fluctuation device, comprising a planetary gear set, a cylinder connected to the planetary gear set, a rope wound around the cylinder, and an energy storage structure connected to one end of the rope;

[0006] A planetary gear set includes a planet carrier, planet pinions, a sun gear, and a ring gear;

[0007] There are at least two ropes, and each rope consists of a winding section, a separating section, and a connecting section connected sequentially from the starting end to the end. The starting end of the rope is fixedly connected to the end of the cylinder that connects to the planetary gear set or to the gear ring. The winding sections are wound side by side and synchronously around the outside of the cylinder. The separating sections are tangent to the cylinder, and all separating sections are equidistantly distributed along the circumference of the cylinder.

[0008] Furthermore, the connecting section, starting from the end connected to the separating section, passes around the fixed pulley and is then fixedly connected to the energy storage structure.

[0009] Furthermore, the outer side of the cylinder is provided with a limit groove in a spiral shape, and the rope is located in the limit groove.

[0010] Furthermore, the energy storage structure is either a gravity energy storage structure or an elastic energy storage structure.

[0011] Furthermore, the gravity energy storage structure includes a weight connected to the separation section, and an upper elastic limiter and a lower elastic limiter respectively spaced apart above and below the weight.

[0012] Furthermore, the cylinder and the gear ring are either integrally formed or detachably fixedly connected.

[0013] Furthermore, the cylinder body includes at least a small torque constant section, a continuously variable torque section, and a large torque constant section connected in sequence.

[0014] Furthermore, bearings are installed on the outside or inside of the gear ring.

[0015] Furthermore, when there are two ropes, they include a first rope and a second rope; the separated sections of the first rope and the second rope are symmetrically arranged outside the cylinder; the fixed pulleys include a first fixed pulley and a second fixed pulley; the weight includes a first weight connected to the first rope and a second weight connected to the second rope.

[0016] A power fluctuation smoothing device for energy storage generators uses a bevel gear differential instead of a planetary gear set.

[0017] The beneficial effects of this invention are as follows: By setting up a planetary gear set, a cylinder, a rope, and an energy storage structure; the rope is wound around the cylinder, and when the power fluctuates, the gear ring rotates, and the cylinder rotates with the gear ring, causing the rope to move, thus converting the work originally undertaken by the generator into gravitational potential energy for storage; the cylinder is set with different diameter sections, corresponding to different torques; there are high torque constant sections, continuously variable torque sections, and low torque constant sections, and the number of sections with different torques can be further increased according to the control precision requirements. The high torque constant section corresponds to the generator's maximum rated power, and the low torque constant section corresponds to the generator's minimum starting power. For a motor, a certain power corresponds to a certain torque and speed.

[0018] It can reduce the maximum rated power required by the motor. For example, under the same operating conditions and with the same wind turbine blade assembly, a traditional generator that requires a rated power of 10KW can be replaced with a 9KW generator with a generator power fluctuation smoothing device. Alternatively, a 10KW generator can be equipped with wind turbine blade assemblies that can handle higher wind speeds and have greater power, thereby increasing the overall power generation capacity. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the three-dimensional structure of a planetary gear set;

[0020] Figure 2 This is a schematic diagram of the planar structure of a planetary gear set;

[0021] Figure 3 This is a schematic diagram showing the relationship between the toothed ring and the rope in a side view structure.

[0022] Figure 4 This is a schematic diagram of the overall structure.

[0023] In the diagram: 1. Bearing; 2. Cylinder; 301. First rope; 302. Second rope; 401. First fixed pulley; 402. Second fixed pulley; 501. First weight; 502. Second weight; 601. Upper elastic limiter; 602. Lower elastic limiter; 7. Limiting slot; 8. Planetary carrier; 9. Planetary pinion; 10. Sun gear; 11. Gear ring. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific examples. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] The directional terms mentioned in this invention, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", "top" and "bottom", are only for reference to the orientation of the accompanying drawings. The directional terms used are for the purpose of explaining and understanding this invention, and are not intended to limit this invention.

[0026] Example 1:

[0027] like Figures 1-4 As shown, the energy storage type smoothing generator power fluctuation device includes a planetary gear set, a cylinder 2 connected to the planetary gear set, a rope wound around the cylinder 2, and an energy storage structure connected to one end of the rope.

[0028] The planetary gear set includes a planet carrier 8, planet pinions 9, a sun gear 10, and a ring gear 11;

[0029] There are at least two ropes, each rope consisting of a winding section, a separating section, and a connecting section connected sequentially from the starting end to the end; the winding section includes the starting end of the rope, and the connecting section includes the end of the rope; the starting ends of all ropes are fixedly connected to one end of the cylinder 2 connected to the planetary gear set or to the gear ring 11; all winding sections are wound side by side synchronously around the outside of the cylinder 2 starting from their starting ends; all separating sections are tangent to the cylinder 2, and all separating sections are equidistantly distributed along the circumference of the cylinder 2.

[0030] All connecting sections begin at the end connected to the separating section, pass around the fixed pulley, and are then fixedly connected to the energy storage structure.

[0031] The outer side of the cylinder 2 is provided with a limit groove 7 in a spiral shape. All ropes are located in the limit groove 7, which is used to limit the position of the ropes.

[0032] The energy storage structure can be either a gravity energy storage structure or an elastic energy storage structure. Gravity energy storage structures use gravitational potential energy to store the converted energy, while elastic energy storage structures use elastic potential energy to store the converted energy. Spring potential energy is less cost-effective than gravitational potential energy, but it can be used to replace gravitational potential energy at low power levels.

[0033] The gravity energy storage structure includes a weight connected to the separation section, and an upper elastic limiter 601 and a lower elastic limiter 602 respectively spaced apart above and below all the weights; the elastic energy storage structure includes a spring fixed at the bottom and connected to the connecting section at the top.

[0034] The cylinder 2 and the gear ring 11 are either integrally formed or detachably fixedly connected.

[0035] The cylinder 2 includes at least a small torque constant section, a continuously variable torque section and a large torque constant section connected in sequence; the small torque constant section has the smallest diameter, the large torque constant section has the largest diameter, and the busbar of the continuously variable torque section has at least one slope, which can be set according to the generator torque curve; if there is more than one slope, they are connected smoothly in sequence.

[0036] A bearing 1 is provided on the outside or inside of the gear ring 11 to limit the rotation of the gear ring 11 on a fixed axis.

[0037] When there are two ropes, including a first rope 301 and a second rope 302; the separated sections of the first rope 301 and the second rope 302 are symmetrically arranged outside the cylinder 2; the fixed pulleys include a first fixed pulley 401 that is wound around the first rope 301 and a second fixed pulley 402 that is wound around the second rope 302; the fixed pulleys are also used to ensure the direction and position distribution of the separated sections; the weights include a first weight 501 connected to the first rope 301 and a second weight 502 connected to the second rope 302.

[0038] Taking one method as an example, the rotational power is input to the planetary carrier 8, and through the combined action of the planetary pinion 9 and the ring gear 11, it is output to the sun gear 10, which drives the generator.

[0039] When the input and output power are balanced, the planetary pinion 9 rotates at a constant speed, the planet carrier 8 rotates at a constant speed, and the ring gear 11 remains stationary. The torque exerted by the ring gear 11 on a single planetary pinion 9 is equal to the torque exerted by the sun gear 10 on that single planetary pinion 9. When the equilibrium is suddenly broken, i.e., when the input power or output power suddenly increases or decreases, the ring gear 11 will rotate. The ring gear 11 then drives a weight to rise and fall via a rope, converting the work generated by the sudden increase or decrease in power into stored or released potential energy. In this way, the work generated by the sudden increase or decrease in power is not entirely borne by the generator, but a large part is converted into changes in potential energy. This helps to significantly reduce the relative fluctuations in the generator's torque and speed, resulting in smaller fluctuations in the power curve. The radius of the rope relative to the center of the toothed ring 11 determines the torque of the rope on the toothed ring 11, that is, the tension F of the rope. In a fixed device, F can be set to a constant value in the equilibrium state, and in the non-equilibrium state, it includes the force generated by acceleration. The torque T = nFR, where n is the number of ropes and R is the vertical distance from the center of the toothed ring to the rope tension, that is, the radius.

[0040] By configuring a planetary gear set, cylinder 2, rope, and energy storage structure; the rope is wound around cylinder 2, and when power fluctuates, the gear ring rotates, and the cylinder moves with the gear ring, causing the rope to move, thus converting the work originally done by the generator into gravitational potential energy for storage; the cylinder is designed with different diameter sections corresponding to different torques: a high torque constant section, a continuously variable torque section, and a low torque constant section. Multiple sections with different torques can be added according to the required control precision. The high torque constant section corresponds to the generator's maximum rated power, and the low torque constant section corresponds to the generator's minimum starting power. For a motor, a certain power corresponds to a certain torque and speed.

[0041] Example 2:

[0042] Unlike Example 1, a bevel gear differential is used instead of a planetary gear set; a bevel gear differential is essentially a planetary gear mechanism, and the same effect can be achieved by replacing the planetary gear set with a differential.

[0043] The above description is only used to illustrate the technical solution of the present invention and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention, as long as they do not depart from the spirit and scope of the technical solution of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. An energy storage type generator power fluctuation smoothing device, characterized in that: It includes a planetary gear set, a cylinder (2) connected to the planetary gear set, a rope wound around the cylinder (2), and an energy storage structure connected to one end of the rope; The planetary gear set includes a planet carrier (8), planet pinions (9), a sun gear (10), and a ring gear (11). The rope has at least two strands, and each rope consists of a winding section, a separating section, and a connecting section connected in sequence from the starting end to the end. The starting end of the rope is fixedly connected to the end of the cylinder (2) that is connected to the planetary gear set or to the gear ring (11). The winding sections are wound side by side and synchronously around the outside of the cylinder (2). The separating section is tangent to the cylinder (2). The cylinder (2) includes at least a small torque constant section, a continuously variable torque section and a large torque constant section connected in sequence; The low torque constant range corresponds to the generator's minimum starting power, while the high torque constant range corresponds to the generator's maximum rated power. The busbar of the continuously variable torque section has at least one slope, and the slope of the curve is set according to the generator torque curve; if there is more than one slope, they are connected smoothly in sequence.

2. The energy storage type generator power fluctuation smoothing device according to claim 1, characterized in that: The connecting section starts from the end connected to the separating section, passes around the fixed pulley, and is then fixedly connected to the energy storage structure.

3. The energy storage type generator power fluctuation smoothing device according to claim 1, characterized in that: The cylinder (2) has a limit groove (7) in a spiral shape on the outside, and the rope is located in the limit groove (7).

4. The energy storage type generator power fluctuation smoothing device according to claim 2, characterized in that: The energy storage structure is either a gravity energy storage structure or an elastic energy storage structure.

5. The energy storage type generator power fluctuation smoothing device according to claim 4, characterized in that: The gravity energy storage structure includes a weight connected to the separation section, and an upper elastic limiter (601) and a lower elastic limiter (602) respectively spaced apart above and below the weight.

6. The energy storage type generator power fluctuation smoothing device according to claim 1, characterized in that: The cylinder (2) is integrally formed with the gear ring (11) or can be detachably fixedly connected.

7. The energy storage type generator power fluctuation smoothing device according to claim 1, characterized in that: The gear ring (11) is provided with a bearing (1) on its exterior or interior.

8. The energy storage type generator power fluctuation smoothing device according to claim 5, characterized in that: When there are two ropes, they include a first rope (301) and a second rope (302); the separated sections of the first rope (301) and the second rope (302) are symmetrically arranged outside the cylinder (2); the fixed pulleys include a first fixed pulley (401) and a second fixed pulley (402); the weights include a first weight (501) connected to the first rope (301) and a second weight (502) connected to the second rope (302).

9. The energy storage type generator power fluctuation smoothing device according to claim 1, characterized in that: The planetary gear set is replaced with a bevel gear differential.

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