A high-efficiency and precise control gravity energy storage power generation model and energy storage system

Abstract

The application discloses a high-efficiency and precise control gravity energy storage power generation model and energy storage system, wherein a generator, a clutch and a double-stretch-shaft motor are coaxially and sequentially connected and are respectively connected with a variable frequency controller, the double-stretch-shaft motor is drivingly connected with a potential energy load through a transmission unit, the variable frequency controller is connected with an electric energy double-fed unit, the generator and the double-stretch-shaft motor are both variable frequency permanent magnet synchronous motors, the transmission unit comprises a winding drum provided with a lifting rope, the winding drum is connected with the double-stretch-shaft motor, a mechanical hand is connected with the lower end of the lifting rope, the mechanical hand is correspondingly provided with a displacement sensor and a visual sensor, the displacement sensor is in communication connection with the variable frequency controller, the lifting channel of the mechanical hand corresponds to a plurality of transverse channel layers which are stacked in positive and negative directions, and each transverse channel layer is provided with a two-dimensional code baffle in communication connection with the visual sensor. The application improves the transmission efficiency of the potential energy load and the power generation quality, saves the excitation electric energy and is low in maintenance cost.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, and in particular to a highly efficient and precisely controlled gravity energy storage power generation model and energy storage system. Background Technology

[0002] The country is vigorously developing clean energy power generation projects, such as wind power, solar photovoltaic power, and tidal power, which are renewable and pollution-free energy sources, thereby reducing carbon emissions from fossil fuel combustion power generation. However, clean energy power generation resources and electricity load are often mismatched, especially at night when grid demand for wind power generation along the coast decreases, making it difficult to absorb the electricity. Energy storage can store electricity or convert it into other forms of energy storage, thereby releasing it during peak electricity demand periods to coordinate with the power grid for peak power regulation.

[0003] Currently, common power generation models in gravity energy storage systems rely on the load directly driving the generator, or connecting the generator to the grid via transmission mechanisms such as pulleys and gearboxes. These transmission methods suffer from numerous transmission links and significant mechanical wear, leading to unstable power generation quality and low system efficiency. Particularly in large-scale gravity energy storage scenarios with storage heights exceeding 100m and load weights exceeding 1000kg, the hoisting system is prone to elastic deformation during long-stroke operation, and wear in the gear or pulley systems increases transmission clearances, making it difficult to control the load's vertical movement speed and achieve precise positioning. Summary of the Invention

[0004] The purpose of this invention is to provide a highly efficient and precise controllable gravity energy storage power generation model and energy storage system, which can effectively improve the transmission efficiency of potential energy loads and the quality of generator output power, save the excitation power of motor rotor, reduce maintenance costs, extend system service life, and solve the above-mentioned problems existing in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This invention discloses a highly efficient and precisely controlled gravity energy storage and power generation model, comprising a generator, a clutch, a dual-shaft motor, a frequency converter, a transmission unit, a potential energy load, and a doubly-fed power supply unit. The generator, clutch, and dual-shaft motor are coaxially connected sequentially and respectively controlled by the frequency converter. The dual-shaft motor is connected to the potential energy load via the transmission unit. The frequency converter is connected to the doubly-fed power supply unit. The generator is a variable-frequency permanent magnet synchronous motor, and during operation, it generates three-phase AC power which enters the frequency converter and is then fed into the doubly-fed power supply unit. The dual-shaft motor is a variable-frequency permanent magnet synchronous motor. The torque, direction, and speed are all controlled by the frequency converter to enable the potential energy load to move precisely according to a preset curve operation command. The transmission unit includes a drum with a lifting cable, which is installed and connected to the dual-shaft motor. The lower end of the lifting cable is connected to a manipulator for positioning and transferring the potential energy load. The manipulator is equipped with a displacement sensor and a vision sensor. The displacement sensor is communicatively connected to the frequency converter. The lifting channel of the manipulator corresponds to multiple horizontal channel layers stacked in the positive and negative directions. Each horizontal channel layer is equipped with a QR code baffle that is communicatively connected to the vision sensor.

[0006] Furthermore, the power doubly fed unit includes an energy storage battery and a public power grid. The energy storage battery provides low-voltage power to the frequency converter in standby mode. When the frequency converter is in operation, it processes the AC power output by the generator and connects it to the public power grid.

[0007] Furthermore, the doubly fed power unit also includes a photovoltaic power generation unit, the power output terminal of which is connected to the energy storage battery and the public power grid respectively.

[0008] Furthermore, a shaft-holding brake is provided between the dual-shaft motor and the transmission unit. The shaft-holding brake is connected to the frequency converter and performs braking or release braking according to the instructions issued by the frequency converter.

[0009] Furthermore, the axle-holding brake is a brake with dual redundancy.

[0010] Furthermore, the braking states of the axle-holding brake include energy storage braking, power generation braking, emergency braking, and safety braking, wherein: The energy storage braking refers to the braking action taken by the bearing brake when the potential energy load completes the specified energy storage requirement and the frequency converter detects and identifies the corresponding QR code baffle through the vision sensor. The generator braking refers to the braking action taken by the bearing brake when the potential energy load completes the specified storage requirement and the frequency converter detects and identifies the QR code baffle through the vision sensor. The emergency braking refers to the braking action performed by the bearing brake when the potential energy load is at any position in the lifting channel. The safety braking refers to the braking action performed manually by operating the axle brake when the potential energy load is at any position in the lifting channel.

[0011] Furthermore, the frequency converter is equipped with an emergency braking resistor to prevent the potential energy load from absorbing excessive current from the DC bus when it overspeeds.

[0012] This invention also provides a highly efficient and precisely controlled gravity energy storage system, including the aforementioned highly efficient and precisely controlled gravity energy storage power generation model and a gravity energy storage parallel frame. The gravity energy storage parallel frame is fixedly installed on a foundation. The gravity energy storage parallel frame includes an upper energy storage layer region and a lower energy storage layer region that are spaced apart in the positive and negative directions, respectively. A lifting channel for accommodating the vertical displacement of potential energy loads is provided between the upper energy storage layer region and the lower energy storage layer region. The upper energy storage layer region includes a plurality of energy storage layers stacked in the positive and negative directions, and the lower energy storage layer region includes a plurality of energy storage layers stacked in the positive and negative directions. The potential energy load is selectively located in the energy storage layer or the energy storage layer. Both the energy storage layer and the energy storage layer serve as lateral channel layers.

[0013] Furthermore, the displacement sensor detects the position of the robot and feeds back the position signal to the frequency converter. The frequency converter controls the torque, direction, and speed of the dual-shaft motor according to the position signal, so that the potential energy load accelerates, decelerates, and moves at a constant speed according to a preset curve.

[0014] Furthermore, the vision sensor obtains the layer position signal by identifying the QR code baffle corresponding to the horizontal channel layer and feeds it back to the frequency converter. The frequency converter controls the bearing brake to perform braking or release braking according to the layer position signal.

[0015] Compared with the prior art, the beneficial technical effects of the present invention are as follows: The efficient and precise control gravity energy storage power generation model and energy storage system of this invention uses a variable frequency permanent magnet synchronous motor as the drive motor and generator. The torque, direction and speed of the dual-shaft motor are controlled by a variable frequency controller, so that the potential energy load runs precisely according to a preset curve, which effectively improves transmission efficiency and power generation quality, and saves excitation energy. At the same time, the robot arm works with displacement sensors to provide real-time position feedback and vision sensors to identify QR code baffles to obtain layer signals, so as to achieve precise inter-layer positioning and reliable docking of the potential energy load, which significantly improves operational safety. Furthermore, the generator, clutch and dual-shaft motor are connected coaxially in sequence, which simplifies the transmission chain, reduces wear parts, lowers maintenance costs and extends the service life of the system. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the connection structure of the gravity energy storage power generation model with high efficiency and precise control according to Embodiment 1 of the present invention; Figure 2 This is a diagram showing the change in the vertical movement of the potential energy load within the lifting channel in the efficient and precise control gravity energy storage power generation model of Embodiment 1 of the present invention. Figure 3 This is a schematic diagram of the structure of the efficient and precise controlled gravity energy storage system of Embodiment 2 of the present invention.

[0018] Explanation of reference numerals in the attached diagram: 2. Potential load; 3. Generator; 4. Clutch; 5. Dual-shaft motor; 6. Variable frequency controller; 7. Doubly fed power unit; 7a. Energy storage battery; 7b. Public power grid; 7c. Photovoltaic power generation unit; 8a. Drum; 8b. Lifting cable; 8c. Robotic arm; 9a. Displacement sensor; 9b. Vision sensor; 9c. QR code baffle; 10. Shaft brake; 11. Foundation; 12. Upper energy storage layer area; 12a. Energy storage layer; 13. Lower energy storage layer area; 13a. Energy storage layer; 14. Lifting channel; 15. Intermediate layer area. Detailed Implementation

[0019] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the description of this invention, it should be understood that the terms "length," "width," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0021] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] The technical solutions provided by the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0023] Example 1 like Figure 1 , Figure 2 As shown, the efficient and precise gravity energy storage power generation model of this embodiment 1 includes a generator 3, a clutch 4, and a double-shaft motor 5 connected coaxially in sequence. The generator 3, clutch 4, and double-shaft motor 5 are respectively controlled and connected to a frequency converter 6. The double-shaft motor 5 is connected to the potential energy load 2. Under the control of the frequency converter 6, the potential energy load 2 rises in the positive direction, falls in the negative direction, or stops under the drive of the double-shaft motor 5. Under the control of the frequency converter 6, the clutch 4 selectively disengages or locks between the generator 3 and the double-shaft motor 5. When the clutch 4 is in the disengaged state, the potential energy load 2 rises in the positive direction under the drive of the double-shaft motor 5 to achieve energy storage. When the clutch 4 is in the locked state, the potential energy load 2 falls in the negative direction under the drive of the double-shaft motor 5 to achieve power generation.

[0024] In this embodiment, when the clutch 4 is disengaged, the generator 3 and the double-shaft motor 5 are mechanically separated, and no torque is transmitted between them; when the clutch 4 is engaged, the generator 3 and the double-shaft motor 5 are mechanically engaged, and equal torque is transmitted between them.

[0025] The variable frequency controller 6 is connected to the doubly fed power unit 7, which includes at least an energy storage battery 7a and a public power grid 7b. The energy storage battery 7a provides low-voltage power to the variable frequency controller 6 when it is in standby mode. When the variable frequency controller 6 is in operation, it processes the AC power output from the generator 3 and connects it to the public power grid 7b. Furthermore, the doubly fed power unit 7 also includes a photovoltaic power generation unit 7c, whose power output terminal is connected to the energy storage battery 7a and the public power grid 7b. The energy storage battery 7a or the public power grid 7b provides medium-voltage and / or low-voltage power to the variable frequency controller 6 when it is in operation. In actual operation, the photovoltaic panels of the photovoltaic power generation unit 7c are arranged on the top and sides of the gravity energy storage parallel frame and receive sunlight. The generated electricity is supplied to the energy storage battery 7a and the public power grid 7b.

[0026] Preferably, the generator 3 is a variable frequency permanent magnet synchronous motor, which generates three-phase alternating current during operation, which enters the variable frequency controller 6 and is then connected to the power doubly fed unit 7; the double-shaft motor 5 is a variable frequency permanent magnet synchronous motor, whose torque, direction and speed are all controlled by the variable frequency controller 6, so that the potential energy load 2 can be precisely displaced according to the preset curve operation command.

[0027] Specifically, the dual-shaft motor 5 is connected to the potential energy load 2 via a transmission unit. The transmission unit includes a drum 8a with a lifting cable 8b, which is connected to the dual-shaft motor 5. A robotic arm 8c for positioning and transferring the potential energy load 2 is connected to the lower end of the lifting cable 8b. The robotic arm 8c selectively ascends, descends, and stops within the lifting channel 14 of the potential energy load 2. The robotic arm 8c is equipped with a displacement sensor 9a and a vision sensor 9b. The displacement sensor 9a is communicatively connected to the frequency converter 6. At the same time, the displacement sensor 9a detects the position of the robot 8c and feeds back the signal to the frequency converter 6, thereby ensuring that the dual-shaft motor 5 performs precise curve acceleration, deceleration and uniform speed movement according to the preset program. The control process is precise, flexible and reliable. The lifting channel 14 corresponds to multiple horizontal channel layers (specifically including each storage layer 13a or each energy storage layer 12a) stacked in the positive and negative directions. Each horizontal channel layer is provided with a QR code baffle 9c (specifically, it can be a structural component with a QR code, and its shape is not limited to plate shape) that is connected to the vision sensor 9b.

[0028] Furthermore, a shaft-holding brake 10 is provided between the dual-shaft motor 5 and the transmission unit. The shaft-holding brake 10 is connected to the frequency converter 6 for control and performs braking or release braking according to the instructions issued by the frequency converter 6. Preferably, the shaft-holding brake 10 is a brake with dual redundancy.

[0029] In this embodiment, the braking states of the axle-holding brake 10 include energy storage braking, power generation braking, emergency braking, and safety braking, wherein: Energy storage braking refers to the braking action taken by the axle brake 10 when the potential energy load 2 completes the specified energy storage requirement and the frequency converter 6 detects and identifies the corresponding QR code baffle 9c through the vision sensor 9b. Generating braking refers to the braking action taken by the axle brake 10 when the potential energy load 2 completes the specified storage requirement and the frequency converter 6 detects and identifies the QR code baffle 9c through the vision sensor 9b. Emergency braking refers to the braking action of the shaft brake 10 when the potential energy load 2 is at any position in the lifting channel 14. Specifically, it can be used for emergency braking when the double-shaft motor 5 or generator 3 fails, or for emergency braking when the frequency converter 6 loses power, or for emergency braking when the frequency converter 6 fails due to overspeed or other faults caused by program loss. Safety braking refers to the braking effect achieved by manually operating the axle brake 10 when the potential energy load 2 is at any position in the lifting channel 14. It is mainly used in dangerous conditions, maintenance conditions, and other working conditions.

[0030] Preferably, the frequency converter 6 is also equipped with an emergency braking resistor to prevent the potential energy load 2 from absorbing excessive current on the DC bus when it overspeeds, thus preventing the voltage from being too high and tripping.

[0031] Example 2 like Figure 3 As shown, the high-efficiency and precise gravity energy storage system of this embodiment 2 includes a gravity energy storage parallel frame fixedly installed on the foundation 11. The gravity energy storage parallel frame can be a stable and reliable structure connected by metal profiles and fasteners. In actual manufacturing, it can adopt an assembly production process, which has high installation efficiency.

[0032] Preferably, the operation of the gravity energy storage parallel frame is supported by the foundation 11, which is made of steel frame concrete, so that the overall life of the gravity energy storage parallel frame can reach more than 40 years and the life cycle cost is low.

[0033] In this embodiment, the gravity energy storage parallel frame includes an upper energy storage layer region 12 and a lower energy storage layer region 13 that are spaced apart in the positive and negative directions, respectively. A lifting channel 14 for accommodating the potential energy load to move up and down is provided between the upper energy storage layer region 12 and the lower energy storage layer region 13. The upper energy storage layer region 12 includes a plurality of energy storage layers 12a that are stacked in the positive and negative directions (which may be distributed in the X direction and / or Y direction in the lateral direction). The lower energy storage layer region 13 includes a plurality of storage layers 13a that are stacked in the positive and negative directions (which may be distributed in the X direction and / or Y direction in the lateral direction). The potential energy load 2 is selectively located in the storage layer 13a or the energy storage layer 12a by displacement within the lifting channel 14. Both the storage layer 12a and the energy storage layer 13a serve as lateral channel layers.

[0034] Preferably, an intermediate layer region 15 is provided between the upper energy storage layer region 12 and the lower energy storage layer region 13. The intermediate layer region 15 serves as an extension region of the upper energy storage layer region 12 and the lower energy storage layer region 13 in the positive and negative directions. In actual operation, the intermediate layer region 15 can serve as an extension unit of the upper energy storage layer region 12 and the lower energy storage layer region 13 in the positive and negative directions to increase the gravity energy storage capacity.

[0035] Furthermore, the potential energy loads in the upper energy storage region 12 and the lower energy storage region 13 can be gravity blocks with the same shape and weight, mainly made of sand and carbon steel, or can be made of other materials. This embodiment does not limit this.

[0036] Furthermore, regarding the structure of the upper energy storage layer region 12 and the lower energy storage layer region 13 used in the embodiments of this application, please refer directly to the relevant structure of the applicant's prior application CN202210646622.6, and this application will not repeat the description of this part.

[0037] In the gravity energy storage system of this embodiment 2, at least one lifting channel 14 adopts the efficient and precise control gravity energy storage power generation model to realize power generation and energy storage.

[0038] The efficient and precise control gravity energy storage power generation model and energy storage system of this invention uses a variable frequency permanent magnet synchronous motor as the drive motor and generator. The torque, direction and speed of the dual-shaft motor are controlled by a variable frequency controller, so that the potential energy load runs precisely according to a preset curve, which effectively improves transmission efficiency and power generation quality, and saves excitation energy. At the same time, the robot arm works with displacement sensors to provide real-time position feedback and vision sensors to identify QR code baffles to obtain layer signals, so as to achieve precise inter-layer positioning and reliable docking of the potential energy load, which significantly improves operational safety. Furthermore, the generator, clutch and dual-shaft motor are connected coaxially in sequence, which simplifies the transmission chain, reduces wear parts, lowers maintenance costs and extends the service life of the system.

[0039] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A highly efficient and precisely controlled gravity energy storage power generation model, characterized in that, The system includes a generator, a clutch, a dual-shaft motor, a frequency converter, a transmission unit, a potential energy load, and a doubly-fed power supply unit. The generator, clutch, and dual-shaft motor are coaxially connected in sequence and each is controlled by the frequency converter. The dual-shaft motor is connected to the potential energy load via the transmission unit. The frequency converter is connected to the doubly-fed power supply unit. The generator is a variable-frequency permanent magnet synchronous motor, and during operation, it generates three-phase AC power which enters the frequency converter and is then fed into the doubly-fed power supply unit. The dual-shaft motor is a variable-frequency permanent magnet synchronous motor, and its torque, direction, and speed are all... Controlled by the frequency converter, the potential energy load is precisely displaced according to a preset curve operation command. The transmission unit includes a drum with a lifting cable, which is installed and connected to the dual-shaft motor. The lower end of the lifting cable is connected to a manipulator for positioning and transferring the potential energy load. The manipulator is equipped with a displacement sensor and a vision sensor. The displacement sensor is communicatively connected to the frequency converter. The lifting channel of the manipulator corresponds to multiple horizontal channel layers stacked in the positive and negative directions. Each horizontal channel layer is provided with a QR code baffle that is communicatively connected to the vision sensor.

2. The efficient and precise control gravity energy storage power generation model according to claim 1, characterized in that, The power doubly fed unit includes an energy storage battery and a public power grid. The energy storage battery provides low-voltage power to the frequency converter in standby mode. When the frequency converter is in operation, it processes the AC power output by the generator and connects it to the public power grid.

3. The efficient and precise control gravity energy storage power generation model according to claim 2, characterized in that, The doubly fed power unit also includes a photovoltaic power generation unit, the power output terminal of which is connected to the energy storage battery and the public power grid respectively.

4. The efficient and precise control gravity energy storage power generation model according to claim 1, characterized in that, A shaft-holding brake is provided between the dual-shaft motor and the transmission unit. The shaft-holding brake is connected to the frequency converter and performs braking or release braking according to the instructions issued by the frequency converter.

5. The efficient and precise control gravity energy storage power generation model according to claim 4, characterized in that, The axle-holding brake is a brake with dual redundancy.

6. The efficient and precise control gravity energy storage power generation model according to claim 4, characterized in that, The braking states of the bearing brake include energy storage braking, power generation braking, emergency braking, and safety braking, wherein: The energy storage braking refers to the braking action taken by the bearing brake when the potential energy load completes the specified energy storage requirement and the frequency converter detects and identifies the corresponding QR code baffle through the vision sensor. The generator braking refers to the braking action taken by the bearing brake when the potential energy load completes the specified storage requirement and the frequency converter detects and identifies the QR code baffle through the vision sensor. The emergency braking refers to the braking action performed by the bearing brake when the potential energy load is at any position in the lifting channel. The safety braking refers to the braking action performed manually by operating the axle brake when the potential energy load is at any position in the lifting channel.

7. The efficient and precise control gravity energy storage power generation model according to claim 6, characterized in that, The frequency converter is equipped with an emergency braking resistor to prevent the potential energy load from absorbing excessive current from the DC bus when it overspeeds.

8. A highly efficient and precisely controlled gravity energy storage system, characterized in that, The invention includes a gravity energy storage power generation model and a gravity energy storage parallel frame with efficient and precise control as described in any one of claims 1-7. The gravity energy storage parallel frame is fixedly installed on a foundation. The gravity energy storage parallel frame includes an upper energy storage layer region and a lower energy storage layer region that are spaced apart in the positive and negative directions, respectively. A lifting channel for accommodating the vertical displacement of potential energy loads is provided between the upper energy storage layer region and the lower energy storage layer region. The upper energy storage layer region includes a plurality of energy storage layers stacked in the positive and negative directions. The lower energy storage layer region includes a plurality of energy storage layers stacked in the positive and negative directions. The potential energy load is selectively located in the energy storage layer or the energy storage layer. Both the energy storage layer and the energy storage layer serve as lateral channel layers.

9. The efficient and precise gravity energy storage system according to claim 8, characterized in that, The displacement sensor detects the position of the robot and feeds back the position signal to the frequency converter. The frequency converter controls the torque, direction and speed of the dual-shaft motor according to the position signal, so that the potential energy load accelerates, decelerates and moves at a constant speed according to a preset curve.

10. The efficient and precise gravity energy storage system according to claim 8, characterized in that, The vision sensor obtains the layer position signal by recognizing the QR code baffle corresponding to the horizontal channel layer and feeds it back to the frequency converter. The frequency converter controls the bearing brake to perform braking or release braking according to the layer position signal.

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