Moving-coil direct-drive gravity energy storage device and control method thereof

Abstract

The invention discloses a moving-coil direct-drive gravity energy storage device and a control method thereof, and belongs to the technical field of gravity energy storage. The moving-coil direct-drive gravity energy storage device comprises a direct-drive conveying system, an energy storage unit and an upper computer; the direct-drive conveying system comprises an alternating-current power grid, an energy storage converter, a direct-drive motor unit and a plurality of primary rotor carriers, one end of the energy storage converter is electrically connected with the alternating-current power grid, and the other end of the energy storage converter is electrically connected with the direct-drive motor unit through a direct-current bus. According to the device, electric energy and potential energy are efficiently and bidirectionally converted through the direct-drive conveying system and the energy storage unit, simultaneous movement of the multiple rotors is achieved, and the space efficiency ratio of gravity energy storage is increased; and compared with a traditional energy storage mode, redundant movement intermediate mechanisms are removed, unnecessary parts and connection are reduced, the installation space is effectively saved, the maintenance difficulty and cost are reduced, and the energy storage device can be applied to wider field conditions.

Description

Technical Field

[0001] The present invention belongs to the technical field of gravity energy storage, and in particular relates to a moving coil direct-drive gravity energy storage device and a control method thereof. Background Art

[0002] Gravity energy storage is an energy storage technology based on physical mechanical principles. Its core concept is to store electrical energy by lifting a heavy object and then release the energy to generate electricity by lowering the object. This technology has garnered widespread attention in recent years due to its potential advantages in terms of full lifecycle, long-term energy storage, safety, environmental friendliness, site selection, and economics.

[0003] Chinese invention patent CN118353175A discloses a gravity energy storage system with grid-forming capabilities. This system utilizes the weight and height difference of heavy objects to achieve the mutual conversion of potential energy and mechanical energy, enabling it to not only provide energy when grid demand is high, but also store energy when grid demand is low or non-existent. However, the energy storage unit of this gravity energy storage system consists of several weight blocks, a gravity turbine, an electrically excited synchronous motor, and a bidirectional converter. This system has a complex structure, occupies a large area, and can only operate one weight block or object at a time. This results in low energy storage and power generation efficiency, high maintenance requirements, and high costs.

[0004] Therefore, there is an urgent need for a moving coil direct-drive gravity energy storage device and a control method thereof, which can realize the simultaneous independent control and operation of multiple movers through the moving coil direct drive method, so that a set of linear motor direct-drive energy storage system can achieve the effect of transporting multiple energy storage blocks at the same time. Summary of the Invention

[0005] An object of the present invention is to provide a moving coil direct-drive gravity energy storage device and a control method thereof, so as to solve at least one aspect of the problems and defects raised in the above-mentioned background technology.

[0006] Specifically, the first aspect of the present invention discloses a moving coil direct-drive gravity energy storage device, comprising:

[0007] Direct drive conveying system, energy storage unit and host computer;

[0008] The direct-drive transmission system includes an AC power grid, an energy storage converter, a direct-drive motor unit, and a plurality of primary mover carriers. One end of the energy storage converter is electrically connected to the AC power grid, and the other end is electrically connected to the direct-drive motor unit via a DC busbar of a busbar structure in a sliding contact manner.

[0009] The direct drive motor unit includes a secondary magnetic track assembly, a plurality of primary mover carriers are arranged on the secondary magnetic track assembly, and a DC bus is insulated and installed on the secondary magnetic track assembly;

[0010] The primary mover carrier is respectively provided with a current collector and an inverter driver;

[0011] The energy storage unit includes several layers of bottom storage areas, several layers of top storage areas, and a transfer mechanism. Several energy storage blocks are arranged in the several layers of bottom storage areas and several layers of top storage areas. The transfer mechanism is used to transfer the energy storage blocks in the storage areas to the primary mover carrier, or to transfer the energy storage blocks on the primary mover carrier to the top storage area or the bottom storage area to preserve the current potential energy of the energy storage blocks;

[0012] The energy storage blocks are respectively transported to a number of primary mover carriers through a transfer mechanism, and the direct drive motor unit drives the primary mover carriers and drives the energy storage blocks to move longitudinally, thereby realizing energy conversion of the energy storage blocks.

[0013] The moving coil direct-drive gravity energy storage device according to the present invention has at least the following beneficial effects:

[0014] This dynamic direct-drive gravity energy storage device achieves efficient two-way conversion of electrical energy and potential energy through a direct-drive transmission system and an energy storage unit. When storing energy, the AC grid electrical energy is converted into the potential energy of the energy storage block via an energy storage converter and a direct-drive motor unit. When generating electricity, the potential energy is converted into electrical energy and fed back to the grid, reducing energy loss in the intermediate conversion link. It can also reduce or avoid the restrictions on movement speed imposed by the charging and generating mechanisms, greatly improving the charging and generating power of a single energy storage block and meeting the needs of fast, high-power energy storage and release.

[0015] After the several primary mover carriers of the moving coil direct-drive gravity energy storage device draw power from the DC bus through the current collector, the inverter drive is started. After receiving relevant instructions from the host computer, with the help of its own sensor system and inverter drive, it can independently control the operation of multiple primary mover carriers, thereby realizing the charging and power generation functions of a set of direct-drive motor units driving the movement of multiple primary mover carriers at the same time, greatly improving the space efficiency ratio of gravity energy storage, enabling the system to achieve more energy storage and conversion within a limited unit space and time, and several energy storage blocks can perform energy storage and power generation operations simultaneously or in batches. The system can be flexibly adjusted according to actual power consumption and energy storage needs, improving the overall operation efficiency and flexibility of the device.

[0016] Compared with the charging and power generation fluctuation suppression method of traditional energy storage blocks, this dynamic coil direct-drive gravity energy storage device eliminates unnecessary moving intermediate mechanisms. Through the dynamic coil direct drive method, the combination layout of the direct-drive transmission system and the energy storage unit is reasonable, the structure is simpler, unnecessary components and connections are reduced, and installation space is effectively saved. The maintenance difficulty and cost are reduced, so that it can be applied in a wider range of site conditions.

[0017] As a further solution of the present invention: the secondary magnetic rail assembly includes charging and generating secondary magnetic rails and a return secondary magnetic rail, and the top and bottom of the charging and generating secondary magnetic rails and the return secondary magnetic rails are respectively provided with docking modules, and a number of primary mover carriers are respectively provided on the charging and generating secondary magnetic rails and the return secondary magnetic rails.

[0018] Since the secondary magnetic rail assembly includes charging and generating secondary magnetic rails and return secondary magnetic rails, the top and bottom of the charging and generating secondary magnetic rails and the return secondary magnetic rails are respectively provided with docking modules, and a number of primary mover carriers are respectively provided on the charging and generating secondary magnetic rails and the return secondary magnetic rails; the charging and generating secondary magnetic rails are used to provide a stable traveling wave magnetic field to the primary mover carrier, so that the energized primary mover carrier generates a controllable traveling wave electromagnetic component to drive the primary mover carrier to move along the traveling wave direction; therefore, when the primary mover carrier carries the energy storage block vertically upward, the electrical energy consumed by the primary mover carrier is converted into mechanical energy of the primary mover carrier and the energy storage block, until it is lifted to the specified drop and stops, and all the electrical energy is converted into mechanical energy of the primary mover carrier The potential energy of the tool and the energy storage block, and the kinetic energy is 0; when the primary mover carrier carries the energy storage block downward longitudinally, the primary mover carrier will generate electromagnetic induction with the charging and generating secondary magnetic rails, and generate induced current, which can be converted into direct current through the inverter drive inside the primary mover carrier and fed to the DC bus. The DC power on the straight bus is then converted in reverse through the energy storage converter to complete the feeding of electric energy to the grid, achieving the effect of power generation, that is: the mechanical energy shared by the primary mover carrier and the energy storage block is converted into electric energy on the AC power grid, until it descends to the specified drop and stops, the mechanical energy shared by the primary mover carrier and the energy storage block is completely converted into electric energy, and the single power generation work is completed.

[0019] During the energy storage process, the primary mover carrier can efficiently convert electrical energy into mechanical energy of the primary mover carrier and the energy storage block, reducing energy loss during the conversion process. Compared with some traditional energy storage methods, this method of converting electrical energy into gravitational potential energy is more direct and improves energy storage efficiency. During the power generation process, the primary mover carrier and the charging and generating secondary magnetic rails generate electromagnetic induction to generate induced current. The inverter drive inside the primary mover carrier converts the induced current into direct current and feeds it to the DC bus. The direct current on the linear bus is then converted in reverse by the energy storage converter to complete the power feed to the grid and achieve the power generation effect. This device realizes the bidirectional conversion of electrical energy and mechanical energy, which can not only store excess electrical energy, but also release the stored energy during peak power consumption, playing a role in regulating the supply and demand balance of the power grid and improving the stability and reliability of the power grid.

[0020] In addition, the docking module and the return secondary magnetic rail are responsible for providing the driving force required for the periodic cyclic motion of the primary mover carrier, which is used to realize the horizontal docking of the primary mover carrier between the charging and generating secondary magnetic rails and the return secondary magnetic rails, so that the entire gravity energy storage device can form a continuous working cycle; when the primary mover carrier completes a charging and generating process on the charging and generating secondary magnetic rails, it can be quickly transferred to the return secondary magnetic rail through the docking module to return to the initial position, and then put into the next round of charging and generating operations, which greatly improves the working efficiency and energy conversion frequency of the energy storage device.

[0021] As a further solution of the present invention: the charging and generating secondary magnetic rails include a mounting frame, a magnetic steel is provided on the top of the mounting frame, and mover moving guides are provided on both sides of the mounting frame and along the length of the charging and generating secondary magnetic rails.

[0022] Since the charging and generating secondary magnetic rails include a mounting frame, a number of magnets are arranged on the top of the mounting frame, and mover movement guides are arranged on both sides of the mounting frame and along the length of the charging and generating secondary magnetic rails; a number of magnets are evenly arranged on one side or both sides of the charging and generating secondary magnetic rails, and the mover movement guides are used to provide the primary mover carrier with the required degree of freedom for movement in the traveling wave direction, ensuring that the primary mover carrier can only move along the guide rail direction, ensuring the stroke accuracy and controllability of the primary mover carrier.

[0023] As a further solution of the present invention: the primary mover carrier also includes a mounting seat, a mover coil group, and several sensors, the current collector is electrically connected to the DC bus sliding contact and to the wires of the inverter drive respectively, and several of the sensors are electrically connected to the inverter drive.

[0024] Since the primary mover carrier also includes a mounting base, a mover coil group, and a number of sensors, the current collector is electrically connected to the DC bus sliding contact and to the conductor of the inverter drive, and the several sensors are electrically connected to the inverter drive; the primary mover carrier relies on the traveling wave electromagnetic component generated between the mover coil group after power is applied and the secondary magnetic track, thereby generating traveling wave motion; the inverter drive has the functions of bidirectional current inversion and signal reception, transmission and processing, and can automatically adjust the inversion direction, voltage, frequency and other parameters after analyzing and processing the received information, so as to finally put the primary mover carrier into a completely controlled motion state; and the sensors The sensor is electrically connected to the inverter drive wire. The current position, speed, acceleration and other information of the primary mover carrier can be accurately measured through the sensor, so that the inverter drive can make corresponding judgments according to the instructions, thereby realizing precise control of the motion state of the primary mover carrier. The primary mover carrier can be accurately driven and positioned according to actual needs to ensure that the primary mover carrier accurately reaches the specified drop, thereby improving the accuracy of energy conversion. At the same time, the current collector can transmit electrical energy from the DC bus and the inverter drive in both directions. The current collector installed on the primary mover carrier enables the primary mover carrier to realize sliding contact current collection or reverse feeding.

[0025] As a further solution of the present invention: a travel limiting mechanism is provided at the bottom of the primary mover carrier and corresponds to the mover movement guide, and the travel limiting mechanism is rollingly fitted inside the mover movement guide.

[0026] By arranging a travel limiting mechanism at the bottom of the primary mover carrier and corresponding to the mover moving guide, the travel limiting mechanism is rolled and fitted in the mover moving guide, so that the primary mover carrier only has the traveling wave movement freedom degree, and the other degrees of freedom are reliably constrained, ensuring that the trajectory of the primary mover carrier is more accurate, thereby improving the working efficiency and performance of the entire energy storage system.

[0027] As a further solution of the present invention: the primary mover carrier further includes a wireless sending and receiving module, and the wireless sending and receiving module is in signal communication with the host computer.

[0028] Since the primary mover carrier also includes a wireless sending and receiving module, the wireless sending and receiving module is connected to the host computer signal, so that the information or instructions between the wireless sending and receiving module and the host computer can be transmitted to each other, and the status information of the primary mover carrier can be effectively sent to the host computer through the wireless sending and receiving module. The received information is analyzed and processed, and the inversion direction, voltage, frequency and other parameters are automatically adjusted, so that the primary mover carrier is finally in a completely controlled motion state.

[0029] As a further solution of the present invention: a signal repeater is further provided on the direct drive motor unit.

[0030] Since a signal repeater is also provided on the direct-drive motor unit, the stability of receiving and sending control signals of multiple primary mover carriers in the direct-drive motor unit can be effectively improved. During the operation of the direct-drive motor system, the primary mover carrier may cause the control signal to be interrupted due to distance, obstacles, etc. The signal repeater can receive and resend the control signal to ensure that the primary mover carrier can continuously and stably receive the signal, thereby ensuring its normal operation.

[0031] As a further solution of the present invention: the docking module includes a horizontal motion component and a docking area secondary magnetic rail, the charging and generating secondary magnetic rails and the return secondary magnetic rail are connected through the horizontal motion component, and the docking area secondary magnetic rail is connected to the charging and generating secondary magnetic rails.

[0032] Since the docking module includes a horizontal motion component and a docking area secondary magnetic track, the charging and power generation secondary magnetic track and the return secondary magnetic track are connected through the horizontal motion component, and the docking area secondary magnetic track is connected to the charging and power generation secondary magnetic track. The horizontal motion component is used to realize the horizontal docking of the primary mover carrier between the charging and power generation secondary magnetic track and the return secondary magnetic track, and the docking area secondary magnetic track can participate in the charging and power generation of the energy storage block. The length of the docking area secondary magnetic track is greater than the length of the primary mover carrier, avoiding the horizontal docking motion interference of the primary mover carrier and ensuring that the docking module successfully completes the docking work; in addition, the return secondary magnetic track is used to provide the electromagnetic component force in the traveling wave direction required for the return of the primary mover carrier, and provide track constraints, so that the secondary mover carrier can stably operate along the predetermined track during the return process, ensuring the accuracy and controllability of its movement.

[0033] The second aspect of the present invention further discloses a control method for a moving coil direct-drive gravity energy storage device, comprising the following steps:

[0034] S1. Starting the direct drive transmission system, and allowing electric energy to flow bidirectionally through the energy storage converter between the AC grid and the DC bus;

[0035] S2. The primary mover carrier draws power from the DC bus through a current collector to start the inverter drive;

[0036] S3, receiving the host computer command, and independently controlling the operation of the primary mover carrier;

[0037] S4. The transport mechanism of the energy storage unit is activated, and the transport mechanism transports the energy storage block to a plurality of primary mover carriers;

[0038] S5. The direct drive motor unit drives a plurality of primary mover carriers and drives the energy storage block to move longitudinally, thereby realizing the control of simultaneously driving a plurality of primary mover carriers to store energy longitudinally upward and generate electricity longitudinally downward.

[0039] As a further solution of the present invention, the following steps are also included:

[0040] S01, when the primary mover carrier carries the energy storage block and moves vertically upward through the power supply of the DC bus, the primary mover carrier consumes electrical energy and converts it into mechanical energy of the primary mover carrier and the energy storage block until it is lifted to a specified drop and stops, and all the electrical energy is converted into potential energy of the primary mover carrier and the energy storage block, and the kinetic energy is 0, thereby realizing the vertical upward energy storage of the primary mover carrier and the energy storage block;

[0041] S02. When the primary mover carrier carries the energy storage block downward longitudinally, the primary mover carrier will generate electromagnetic induction with the charging and generating secondary magnetic rails and generate induced current. The induced current can be converted into direct current through the inverter driver inside the primary mover carrier and fed to the DC bus. The direct current on the linear bus is then converted in reverse through the energy storage inverter to complete the feeding of electric energy to the grid and achieve the effect of power generation, thereby realizing the downward power generation of the primary mover carrier and the energy storage block. Subsequently, the connecting module and the return secondary magnetic rail drive the primary mover carrier back to the initial position to prepare for the next cycle.

[0042] The control method of the moving coil direct-drive gravity energy storage device uses a DC busbar with a sliding busbar structure to enable the current collector and inverter driver installed on the primary mover carrier to slide and draw power from the DC busbar through sliding contacts, so that the primary mover carrier carries the energy storage block vertically upward through the power supply of the DC busbar, efficiently converts the electrical energy into mechanical energy of the primary mover carrier and the energy storage block, and finally converts it into potential energy. The entire process has relatively few energy conversion links, which reduces energy loss during the conversion process and improves energy storage efficiency. When the primary mover carrier carries the energy storage block vertically downward, the primary mover carrier undergoes electromagnetic induction with the charging and generating secondary magnetic rails and generates an induced current. The induced current can be converted into direct current through the inverter driver inside the primary mover carrier and fed to the DC busbar. The direct current on the linear busbar is then converted in the opposite direction through the energy storage converter to complete the feeding of electrical energy to the grid, achieve the effect of power generation, and efficiently convert the stored potential energy back into electrical energy, realizing energy recycling. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0044] Figure 1 This is a structural diagram of a moving coil direct-drive gravity energy storage device;

[0045] Figure 2 This is a schematic diagram of the principle of a direct-drive conveying system for a moving coil direct-drive gravity energy storage device;

[0046] Figure 3This is a schematic diagram of the structure of a direct-drive motor unit of a moving coil direct-drive gravity energy storage device;

[0047] Figure 4 This is a schematic diagram of the structure of the charging and generating secondary magnetic track of a moving coil direct-drive gravity energy storage device;

[0048] Figure 5 This is a schematic diagram of the primary mover structure of a moving coil direct-drive gravity energy storage device;

[0049] Figure 6 This is a schematic diagram of the position and time of each primary mover carrier in the power generation mode of a moving coil direct-drive gravity energy storage device.

[0050] Reference numerals:

[0051] 1. Direct-drive conveying system; 11. AC power grid; 12. Energy storage converter; 13. Direct-drive motor unit; 131. Charging and generating secondary magnetic rails; 1311. Mounting frame; 1312. Magnet; 1313. Mover moving guide; 132. Return secondary magnetic rail; 133. Docking module; 1331. Horizontal motion assembly; 1332. Docking area secondary magnetic rail; 14. Primary mover carrier; 141. Current collector; 142. Inverter drive; 143. Mounting seat; 144. Mover coil assembly; 145. Sensor; 146. Travel limit mechanism; 2. Energy storage unit; 21. Bottom storage area; 22. Top storage area; 23. Transfer mechanism; 24. Energy storage block. DETAILED DESCRIPTION

[0052] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the technical solutions of the present invention are further specifically described below through examples and in conjunction with the accompanying drawings. In the specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention and should not be construed as limiting the present invention.

[0053] In addition, in the following detailed description, for ease of explanation, numerous specific details are set forth to provide a comprehensive understanding of the disclosed embodiments. However, it is apparent that one or more embodiments can be practiced without these specific details. In other cases, well-known structures and devices are shown in diagrammatic form to simplify the accompanying drawings.

[0054] like Figure 1-5The embodiment of the present invention is shown as a moving coil direct-drive gravity energy storage device, comprising: a direct-drive transmission system 1, an energy storage unit 2 and a host computer; the direct-drive transmission system 1 comprises an AC power grid 11, an energy storage converter 12, a direct-drive motor unit 13 and a plurality of primary mover carriers 14, one end of the energy storage converter 12 is electrically connected to the AC power grid 11, and the other end is electrically connected to the direct-drive motor unit 13 by sliding contact through a DC busbar of a sliding busbar structure; the direct-drive motor unit 13 comprises a secondary magnetic rail assembly, a plurality of primary mover carriers 14 are arranged on the secondary magnetic rail assembly, and the DC busbar is insulated and installed on the secondary magnetic rail assembly; the primary mover carriers 14 are respectively provided with a current collector 141 and an inverter driver 14 2; the energy storage unit 2 includes several bottom storage areas 21, several top storage areas 22 and a transfer mechanism 23. Several energy storage blocks 24 are arranged in the several bottom storage areas 21 and the several top storage areas 22. The transfer mechanism 23 is used to transfer the energy storage blocks 24 in the storage area to the primary mover carrier 14, or to transfer the energy storage blocks 24 on the primary mover carrier 14 to the top storage area 21 or the bottom storage area 22 to preserve the current potential energy of the energy storage blocks 24; the energy storage blocks 24 are respectively transported to several primary mover carriers 14 through the transfer mechanism 23, and the direct drive motor unit 13 drives the several primary mover carriers 14 and drives the several energy storage blocks 24 to move longitudinally, thereby realizing the energy conversion of the energy storage blocks 24.

[0055] Specifically, the moving coil direct-drive gravity energy storage device realizes efficient bidirectional conversion of electrical energy and potential energy through the direct-drive transmission system 1 and the energy storage unit 2; when storing energy, the electrical energy of the AC power grid 11 is converted into the potential energy of the energy storage block 24 through the energy storage converter 12 and the direct-drive motor unit 13; when generating electricity, the potential energy is converted into electrical energy and fed back to the power grid, reducing the energy loss in the intermediate conversion link; and it can reduce or avoid the restrictions of the charging and generating mechanisms on the movement speed, which can greatly improve the charging and generating power of a single energy storage block 24, and meet the needs of fast and high-power energy storage and release.

[0056] After the several primary mover carriers 14 of the moving coil direct-drive gravity energy storage device draw power from the DC bus through the current collector 141, the inverter driver 142 is started. After receiving the relevant instructions from the host computer, with the help of its own sensing system and inverter driver 142, it can independently control the operation of multiple primary mover carriers 14, thereby realizing the charging and power generation functions of a set of direct-drive motor units 13 driving the movement of multiple primary mover carriers 14 at the same time, greatly improving the space efficiency ratio of gravity energy storage, enabling the system to achieve more energy storage and conversion within a limited unit space and time, and several energy storage blocks 24 can perform energy storage and power generation operations simultaneously or in batches. The system can be flexibly adjusted according to actual power consumption and energy storage needs, thereby improving the overall operation efficiency and flexibility of the device.

[0057] Compared with the charging and power generation fluctuation suppression method of the traditional energy storage block, the moving coil direct-drive gravity energy storage device eliminates the redundant moving intermediate mechanism. Through the moving coil direct drive method, the combination layout of the direct-drive transmission system 1 and the energy storage unit 2 is reasonable, the structure is simpler, unnecessary components and connections are reduced, the installation space is effectively saved, and the maintenance difficulty and cost are reduced, so that it can be applied under a wider range of site conditions.

[0058] like Figure 3 As shown, the secondary magnetic rail assembly includes a charging and generating secondary magnetic rail 131 and a return secondary magnetic rail 132. The top and bottom of the charging and generating secondary magnetic rail 131 and the return secondary magnetic rail 132 are respectively provided with a docking module 133, and a plurality of primary mover carriers 14 are respectively provided on the charging and generating secondary magnetic rail 131 and the return secondary magnetic rail 132.

[0059] Specifically, since the secondary magnetic rail assembly includes a charging and generating secondary magnetic rail 131 and a return secondary magnetic rail 132, the top and bottom of the charging and generating secondary magnetic rail 131 and the return secondary magnetic rail 132 are respectively provided with a docking module 133, and a number of primary mover carriers 14 are respectively provided on the charging and generating secondary magnetic rail 131 and the return secondary magnetic rail 132; the charging and generating secondary magnetic rail 131 is used to provide a stable traveling wave magnetic field to the primary mover carrier 14, so that the energized primary mover carrier 14 generates a controllable traveling wave electromagnetic component to drive the primary mover carrier 14 to move along the traveling wave direction; therefore, when the primary mover carrier 14 carries the energy storage block 24 longitudinally upward, the electrical energy consumed by the primary mover carrier 14 is converted into mechanical energy of the primary mover carrier 14 and the energy storage block 24 until it is lifted to the specified drop and stops, and all the electrical energy is used. It is converted into the potential energy of the primary mover carrier 14 and the energy storage block 24, and the kinetic energy is 0; when the primary mover carrier 14 carries the energy storage block 24 downward longitudinally, the primary mover carrier 14 will generate electromagnetic induction with the charging and generating secondary magnetic rail 131, and generate an induced current, which can be converted into direct current through the inverter driver 142 inside the primary mover carrier 14 and fed to the DC bus. The DC power on the straight bus is then reversed through the energy storage converter 12 for conversion, and the power feed can be completed to achieve the power generation effect, that is: the mechanical energy shared by the primary mover carrier 14 and the energy storage block 24 is converted into electrical energy on the AC power grid 11, until it descends to the specified drop and stops, and the mechanical energy shared by the primary mover carrier 14 and the energy storage block 24 is completely converted into electrical energy, and the single power generation work is completed.

[0060] During the energy storage process, the primary mover carrier 14 can efficiently convert electrical energy into mechanical energy of the primary mover carrier 14 and the energy storage block 24, reducing energy loss during the conversion process. Compared with some traditional energy storage methods, this method of converting electrical energy into gravitational potential energy is more direct and improves energy storage efficiency. During the power generation process, the primary mover carrier 14 and the charging and generating secondary magnetic track 131 undergo electromagnetic induction to generate an induced current. The induced current is converted into direct current by the inverter driver 142 inside the primary mover carrier 14 and fed to the DC bus. The direct current on the linear bus is then reversed through the energy storage converter 12 to complete the power feed to the grid, achieving the power generation effect. This device realizes the bidirectional conversion of electrical energy and mechanical energy, which can not only store excess electrical energy but also release the stored energy during peak power consumption, playing a role in regulating the supply and demand balance of the power grid and improving the stability and reliability of the power grid.

[0061] like Figure 4 As shown, the charging and generating secondary magnetic track 131 includes a mounting frame 1311 , a plurality of magnets 1312 are arranged on the top of the mounting frame 1311 , and mover moving guides 1313 are arranged on both sides of the mounting frame 1311 and along the length of the charging and generating secondary magnetic track 131 .

[0062] Specifically, since the charging and generating secondary magnetic rails 131 include a mounting frame 1311, a plurality of magnets 1312 are arranged on the top of the mounting frame 1311, and a mover moving guide 1313 is arranged on both sides of the mounting frame 1311 and along the length of the charging and generating secondary magnetic rails 131; a plurality of magnets 1312 are evenly arranged on one side or both sides of the charging and generating secondary magnetic rails 131, and the mover moving guide 1313 is used to provide the primary mover carrier 14 with the required degree of freedom for movement in the traveling wave direction, ensuring that the primary mover carrier 14 can only move along the guide rail direction, ensuring the stroke accuracy and controllability of the primary mover carrier 14.

[0063] like Figure 5 As shown, the primary mover carrier 14 further includes a mounting base 143 , a mover coil assembly 144 , and a plurality of sensors 145 . The current collector 141 is electrically connected to the DC bus sliding contact and to the wires of the inverter driver 142 , respectively. The plurality of sensors 145 is electrically connected to the inverter driver 142 .

[0064] Specifically, since the primary mover carrier 14 also includes a mounting base 143, a mover coil group 144, and a plurality of sensors 145, the current collector 141 is electrically connected to the DC bus sliding contact and to the wire of the inverter driver 142, and the plurality of sensors 145 are electrically connected to the inverter driver 142; the primary mover carrier 14 generates a traveling wave electromagnetic component force between the mover coil group 144 and the secondary magnetic track after being energized, thereby generating a traveling wave motion; the inverter driver 142 has the functions of bidirectional current inversion and signal reception, transmission and processing, and can automatically adjust the inversion direction, voltage, frequency and other parameters after analyzing and processing the received information, so as to finally put the primary mover carrier 14 into a completely controlled motion state; and The sensor 145 is electrically connected to the inverter driver 142 through a wire. The sensor 145 can accurately measure the current position, speed, acceleration and other information of the primary mover carrier 14, so that the inverter driver 142 can make corresponding judgments according to the instructions, thereby realizing precise control of the motion state of the primary mover carrier 14, and can accurately drive and position the primary mover carrier 14 according to actual needs, ensuring that the primary mover carrier 14 accurately reaches the specified drop, thereby improving the accuracy of energy conversion; at the same time, the current receiver 141 can bidirectionally transmit electrical energy from the DC bus and the inverter driver 142, and the primary mover carrier 14 can realize sliding contact current collection or reverse feeding through the current receiver 141 installed on the primary mover carrier 14.

[0065] Furthermore, a travel limiting mechanism 146 is provided at the bottom of the primary mover carrier 14 and corresponds to the mover movement guide 1313 , and the travel limiting mechanism 146 is rollingly fitted in the mover movement guide 1313 .

[0066] Specifically, a travel limiting mechanism 146 is provided at the bottom of the primary mover carrier 14 and corresponding to the mover moving guide 1313. The travel limiting mechanism 146 is rolled and fitted in the mover moving guide 1313, so that the primary mover carrier 14 only has the traveling wave movement degree of freedom, and the remaining degrees of freedom are reliably constrained, ensuring that the running trajectory of the primary mover carrier 14 is more accurate, thereby improving the working efficiency and performance of the entire energy storage system.

[0067] Furthermore, the primary mover carrier 14 also includes a wireless sending and receiving module, which is in signal communication with the host computer.

[0068] Specifically, since the primary mover carrier 14 also includes a wireless sending and receiving module, the wireless sending and receiving module is connected to the host computer signal, so that the information or instructions between the wireless sending and receiving module and the host computer can be transmitted to each other, and the status information of the primary mover carrier 14 can be effectively sent to the host computer through the wireless sending and receiving module, and the received information is analyzed and processed to automatically adjust the inversion direction, voltage, frequency and other parameters, so that the primary mover carrier 14 is finally in a completely controlled motion state.

[0069] Furthermore, a signal repeater is also provided on the direct drive motor unit 13 .

[0070] Specifically, since a signal repeater is also provided on the direct-drive motor unit 13, the reception and transmission stability of the control signals of the multiple primary mover carriers 14 in the direct-drive motor unit 13 can be effectively improved. During the operation of the direct-drive motor system, the primary mover carrier 14 may cause the control signal to be interrupted due to distance, obstacles, etc. The signal repeater can receive and resend the control signal to ensure that the primary mover carrier can continuously and stably receive the signal, thereby ensuring its normal operation.

[0071] like Figure 3 As shown, the docking module 133 includes a horizontal motion component 1331 and a docking area secondary magnetic track 1332. The charging and generating secondary magnetic tracks 131 and the return secondary magnetic track 132 are connected through the horizontal motion component 1331. The docking area secondary magnetic track 1332 is connected to the charging and generating secondary magnetic tracks 131.

[0072] Specifically, since the docking module 133 includes a horizontal motion component 1331 and a docking area secondary magnetic rail 1332, the charging and generating secondary magnetic rail 131 and the return secondary magnetic rail 132 are connected through the horizontal motion component 1331, and the docking area secondary magnetic rail 1332 is connected to the charging and generating secondary magnetic rail 131, the horizontal docking of the primary mover carrier 14 between the charging and generating secondary magnetic rail 131 and the return secondary magnetic rail 132 is realized through the horizontal motion component 1331, and the docking area secondary magnetic rail 1332 can participate in the charging and generating of the energy storage block 24. The length of the secondary magnetic rail 1332 in the docking area is greater than the length of the primary mover carrier 14, which avoids the horizontal docking movement interference of the primary mover carrier 14 and ensures that the docking module 133 successfully completes the docking work; in addition, the return secondary magnetic rail 132 is used to provide the electromagnetic component in the traveling wave direction required for the primary mover carrier 14 to return, and provide track constraints, so that the secondary mover carrier 14 can run stably along the predetermined track during the return process, ensuring the accuracy and controllability of its movement.

[0073] According to an embodiment of the present invention, Figure 6As shown, the timing of several layers of bottom storage areas and several layers of top storage areas in the power generation state and the energy storage state through the direct drive motor unit is the same, only the reverse operation, so it will not be repeated; in order to simplify the calculation and description, the operation time of each section of the primary mover carrier is simplified as follows: the top storage area and the bottom storage area are N layers, the primary mover carrier connection time is t1, the adjacent layer primary mover carrier in place time is t2, then the X-th layer primary mover carrier in place time is (N-X+1)×2, the energy storage block loading and unloading time is t3, the loaded primary mover carrier power generation operation time is t4, and the unloaded primary mover carrier return time is t5.

[0074] The operating cycle time of the primary mover carrier of the Xth layer is simplified and disassembled into the following steps:

[0075] 1 connection, time t1;

[0076] 2 in place: (N-X+1)×2;

[0077] 3 Loading: Time t3;

[0078] 4 Power generation operation: time t4;

[0079] 5 Blanking: time t3;

[0080] 6. Positioning to the return docking area, time x × t2;

[0081] 7 Return connection: time t1;

[0082] 8. Return motion of unloaded mover: t5;

[0083] By adding up the duration of each of the above steps, we can get the primary mover carrier motion period T:

[0084] T=2×(t1+t3)+(N+1)×t2+t4+t5;

[0085] Assuming the material transport cycle time is t, and the total number of primary mover carriers required is M, then:

[0086] M=rounddown(T / t), where t can be adjusted according to actual needs.

[0087] Therefore, according to Figure 6As shown, the line type indicates: the continuous line is the primary mover carrier in the charging and generating secondary magnetic track area, and the dotted line is the primary mover carrier in the return secondary magnetic track and the secondary magnetic track area of ​​the docking area; therefore, it can be clearly understood that, except for the first periodic interval, a reference time line is made in any longitudinal direction. When the number of primary movers in each group of the direct-drive motor unit is M, the reference time line can ensure that a maximum of N-1 energy storage blocks are running at the same time; and the time for the mover to run in the power generation mode is T, ensuring that the mover's beat remains consistent during operation, that is: by adjusting the beats of each section of the primary mover carrier, each set of direct-drive motor units can always maintain consistent charging and generating power in the charging and generating states, without being affected by the loading and unloading actions of the materials, and can effectively eliminate energy fluctuations.

[0088] During the energy storage and power generation process, by reasonably adjusting the beats of each section of the primary mover carrier 14, N-1 energy storage blocks 24 can be guaranteed to operate simultaneously at any time, avoiding power fluctuations caused by the loading and unloading actions of a single energy storage block 24, ensuring consistent and stable charging and power generation power, and effectively eliminating energy fluctuations; in the energy storage stage, stable charging power can ensure the efficient progress of the energy storage process and avoid energy loss caused by unstable power; in the power generation stage, stable power generation power can improve the quality of electric energy, make the output electric energy more in line with the requirements of the power grid, reduce damage to power equipment, and improve the reliability and safety of the entire power system.

[0089] Moreover, when the M primary movers are running simultaneously, the device is in a full-load or near-full-load operating state for most of the time, ensuring that the energy storage blocks in the N-1 bottom storage area or top storage area are always running simultaneously, avoiding idleness and waste of the device, and improving the utilization rate of the equipment and the overall operating efficiency of the system.

[0090] The second aspect of the present invention further discloses a control method for a moving coil direct-drive gravity energy storage device, comprising the following steps:

[0091] S1, start the direct drive transmission system 1, and the electric energy flows bidirectionally through the energy storage converter 12 between the AC grid 11 and the DC bus;

[0092] S2, the primary mover carrier 14 draws power from the DC bus through the current receiver 141 and starts the inverter driver 142;

[0093] S3, receiving the host computer command, and independently controlling the operation of the primary mover carrier 14;

[0094] S4, the transport mechanism 23 of the energy storage unit 2 is started, and the transport mechanism 23 transports the energy storage block 24 to a plurality of primary mover carriers 14;

[0095] S5. The direct drive motor unit 13 drives the primary mover carriers 14 and drives the energy storage block 25 to move longitudinally, thereby simultaneously driving the primary mover carriers 14 to store energy longitudinally upward and generate electricity longitudinally downward.

[0096] Furthermore, the method further comprises the following steps:

[0097] S01, when the primary mover carrier 14 carries the energy storage block 24 vertically upward through the power supply of the DC bus, the primary mover carrier 14 consumes electrical energy and converts it into mechanical energy of the primary mover carrier 14 and the energy storage block 24 until it is lifted to a specified drop and stops, and all the electrical energy is converted into potential energy of the primary mover carrier 14 and the energy storage block 24, and the kinetic energy is 0, thereby realizing the vertical upward energy storage of the primary mover carrier 14 and the energy storage block 24;

[0098] S02. When the primary mover carrier 14 carries the energy storage block 24 downward longitudinally, the primary mover carrier 14 will generate electromagnetic induction with the charging and generating secondary magnetic rail 131 and generate an induced current. The induced current can be converted into direct current through the inverter driver 142 inside the primary mover carrier 14 and fed to the DC bus. The direct current on the linear bus is then converted in reverse through the energy storage converter 12 to complete the feeding of electric energy to the grid and achieve the effect of power generation, thereby realizing the downward power generation of the primary mover carrier 14 and the energy storage block 24. Subsequently, the connecting module 133 and the return secondary magnetic rail 13 drive the primary mover carrier 14 back to the initial position to prepare for the next cycle.

[0099] Specifically, the control method of the moving coil direct drive gravity energy storage device uses a DC busbar with a sliding contact structure to enable the current collector 141 and the inverter driver 142 installed on the primary mover carrier 14 to slide and take power from the DC busbar through the sliding contact, so that the primary mover carrier 14 carries the energy storage block 24 through the power supply longitudinal upward of the DC busbar, and efficiently converts the electrical energy into the mechanical energy of the primary mover carrier 14 and the energy storage block 24, and finally converts it into potential energy. The energy conversion links in the whole process are relatively few, which reduces the energy loss in the conversion process and improves Improves energy storage efficiency; when the primary mover carrier 14 carries the energy storage block 24 downward longitudinally, the primary mover carrier 14 generates electromagnetic induction with the charging and generating secondary magnetic rail 131, and generates induced current, which can be converted into direct current through the inverter driver 142 inside the primary mover carrier 14 and fed to the DC bus. The DC power on the straight bus is then converted in reverse through the energy storage converter 12 to complete the feeding of electric energy to the grid, achieve the effect of power generation, and efficiently convert the stored potential energy back into electric energy, thereby realizing energy recycling.

[0100] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A moving coil direct drive gravity energy storage device, characterized in that: include: Direct drive conveying system, energy storage unit and host computer; The direct-drive transmission system includes an AC power grid, an energy storage converter, a direct-drive motor unit, and a plurality of primary mover carriers. One end of the energy storage converter is electrically connected to the AC power grid, and the other end is electrically connected to the direct-drive motor unit via a DC busbar of a busbar structure in a sliding contact manner. The direct drive motor unit includes a secondary magnetic track assembly, a plurality of primary mover carriers are arranged on the secondary magnetic track assembly, and a DC bus is insulated and installed on the secondary magnetic track assembly; The primary mover carrier is respectively provided with a current collector and an inverter driver; The energy storage unit includes several layers of bottom storage areas, several layers of top storage areas, and a transfer mechanism. Several energy storage blocks are arranged in the several layers of bottom storage areas and several layers of top storage areas. The transfer mechanism is used to transfer the energy storage blocks in the storage areas to the primary mover carrier, or to transfer the energy storage blocks on the primary mover carrier to the top storage area or the bottom storage area to preserve the current potential energy of the energy storage blocks; The energy storage blocks are respectively transported to a number of primary mover carriers through a transfer mechanism, and the direct drive motor unit drives the primary mover carriers and drives the energy storage blocks to move longitudinally, thereby realizing energy conversion of the energy storage blocks.

2. The moving coil direct drive gravity energy storage device according to claim 1, characterized in that: The secondary magnetic rail assembly includes charging and generating secondary magnetic rails and a return secondary magnetic rail. The top and bottom of the charging and generating secondary magnetic rails and the return secondary magnetic rails are respectively provided with docking modules, and a number of primary mover carriers are respectively provided on the charging and generating secondary magnetic rails and the return secondary magnetic rails.

3. The moving coil direct drive gravity energy storage device according to claim 2, characterized in that: The charging and generating secondary magnetic track includes a mounting frame, a plurality of magnetic steels are arranged on the top of the mounting frame, and mover moving guides are arranged on both sides of the mounting frame and along the length of the charging and generating secondary magnetic track.

4. The moving coil direct drive gravity energy storage device according to claim 3, characterized in that: The primary mover carrier further includes a mounting seat, a mover coil assembly, and a plurality of sensors. The current collector is respectively electrically connected to the DC busbar and the inverter driver in a sliding contact manner. The plurality of sensors are electrically connected to the inverter driver.

5. The moving coil direct drive gravity energy storage device according to claim 4, characterized in that: A travel limiting mechanism is provided at the bottom of the primary mover carrier and corresponds to the mover movement guide. The travel limiting mechanism is rollably fitted inside the mover movement guide.

6. The moving coil direct drive gravity energy storage device according to claim 5, characterized in that: The primary mover carrier further includes a wireless sending and receiving module, which is in signal communication with a host computer.

7. The moving coil direct drive gravity energy storage device according to claim 6, characterized in that: The direct drive motor unit is also provided with a signal repeater.

8. The moving coil direct drive gravity energy storage device according to claim 7, characterized in that: The docking module includes a horizontal motion component and a docking area secondary magnetic track. The charging and generating secondary magnetic tracks and the return secondary magnetic track are connected through the horizontal motion component. The docking area secondary magnetic track is connected to the charging and generating secondary magnetic tracks.

9. A control method for a moving coil direct drive gravity energy storage device according to any one of claims 1 to 8, characterized in that: The steps include: S1. Starting the direct drive transmission system, and allowing electric energy to flow bidirectionally through the energy storage converter between the AC grid and the DC bus; S2. The primary mover carrier draws power from the DC bus through a current collector to start the inverter drive; S3, receiving the host computer command, and independently controlling the operation of the primary mover carrier; S4. The transport mechanism of the energy storage unit is activated, and the transport mechanism transports the energy storage block to a plurality of primary mover carriers; S5. The direct drive motor unit drives a plurality of primary mover carriers and drives the energy storage block to move longitudinally, thereby realizing the control of simultaneously driving a plurality of primary mover carriers to store energy longitudinally upward and generate electricity longitudinally downward.

10. The control method of the moving coil direct drive gravity energy storage device according to claim 9, characterized in that: The following steps are also included: S01, when the primary mover carrier carries the energy storage block and moves vertically upward through the power supply of the DC bus, the primary mover carrier consumes electrical energy and converts it into mechanical energy of the primary mover carrier and the energy storage block until it is lifted to a specified drop and stops, and all the electrical energy is converted into potential energy of the primary mover carrier and the energy storage block, and the kinetic energy is 0, thereby realizing the vertical upward energy storage of the primary mover carrier and the energy storage block; S02. When the primary mover carrier carries the energy storage block downward longitudinally, the primary mover carrier will generate electromagnetic induction with the charging and generating secondary magnetic rails and generate induced current. The induced current can be converted into direct current through the inverter driver inside the primary mover carrier and fed to the DC bus. The direct current on the linear bus is then converted in reverse through the energy storage inverter to complete the feeding of electric energy to the grid and achieve the effect of power generation, thereby realizing the downward power generation of the primary mover carrier and the energy storage block. Subsequently, the connecting module and the return secondary magnetic rail drive the primary mover carrier back to the initial position to prepare for the next cycle.

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