Hybrid gravity energy storage system and control method thereof

Abstract

The invention provides a hybrid gravity energy storage system and a control method thereof. The system comprises a plurality of storage platforms which are distributed at intervals in the height direction, and a plurality of energy storage medium parking points are arranged on the storage platforms; a conveying channel is arranged on the side face of the storage platform. The lift car conveying mechanism at least comprises a driving unit capable of generating electricity, and the driving unit capable of generating electricity is used for driving the lift car to move in the conveying channel; when the lift car is in the first moving state, the power-generating driving unit consumes power, and when the lift car is in the second moving state, the power-generating driving unit generates power; the energy storage medium conveying mechanism is used for moving the energy storage medium between the lift car and the storage platform and on the storage platform; the wireless energy transmission module comprises a power grid end wireless energy transmission module and a battery end wireless energy transmission module; the power grid end wireless energy transmission module is arranged at an energy storage medium parking point of the storage platform; and the battery end wireless energy transmission module is arranged on the energy storage medium.

Description

Technical Field

[0001] The present invention belongs to the technical field of power grid energy storage, and in particular relates to a hybrid gravity energy storage system and a control method thereof. Background Art

[0002] At present, with the further development of renewable energy and the deepening of distributed energy construction in China, the stability of the power grid has gradually attracted attention, especially the randomness and volatility of wind and solar energy, which has brought challenges to the stable operation of the power grid. Energy storage systems can make up for this problem well.

[0003] At present, my country's energy storage systems are mainly pumped storage and electrochemical battery storage. However, pumped storage has high environmental requirements and needs to be built on rivers and reservoirs; electrochemical battery storage has problems such as safety and environmental damage caused by battery elimination. How to provide a better energy storage method has become a top priority. Summary of the invention

[0004] The present invention provides a hybrid gravity energy storage system and a control method thereof, which can realize rapid energy storage and rapid energy supply to a power grid.

[0005] In one aspect, a hybrid gravity energy storage system is provided, comprising: A storage platform, wherein the plurality of storage platforms are spaced apart in the height direction, and the storage platform is provided with a plurality of energy storage medium parking points; a conveying channel is provided on the side of the storage platform, and a car is provided in the conveying channel, and the car is used to transport the energy storage medium between the plurality of storage platforms; The car conveying mechanism comprises at least a power-generating driving unit, wherein the power-generating driving unit is used to drive the car to move in the conveying passage; when the car is in a first moving state, the power-generating driving unit consumes power, and when the car is in a second moving state, the power-generating driving unit generates power; An energy storage medium conveying mechanism for moving the energy storage medium between the car and the storage platform, and on the storage platform; The wireless energy transmission module includes a grid-end wireless energy transmission module and a battery-end wireless energy transmission module; the grid-end wireless energy transmission module is arranged at the energy storage medium parking point of the storage platform, and the grid-end wireless energy transmission module includes a grid end; the battery-end wireless energy transmission module is arranged on the energy storage medium, and the battery-end wireless energy transmission module includes a battery end. The grid-end wireless energy transmission module and the battery-end wireless energy transmission module can transmit power to each other.

[0006] Optionally, the grid-end wireless energy transmission module includes a grid-end, a rectifier inverter unit, a voltage stabilizing unit, a grid-end high-frequency generating unit, a grid-end wireless energy transmission compensation unit, and a grid-end wireless energy transmission coil; The rectifier and inverter unit has a rectifier state and an inverter state. The rectifier and inverter unit, the voltage stabilizing unit and the grid-end high-frequency generating unit are sequentially connected in parallel. The grid end is connected to the rectifier and inverter unit. The grid-end wireless energy transmission compensation unit is connected to the grid-end high-frequency generating unit. The grid-end wireless energy transmission coil is connected to the grid-end wireless energy transmission compensation unit. The battery-end wireless energy transmission module includes a battery-end wireless energy transmission coil, a battery-end wireless energy transmission compensation unit, a battery-end high-frequency generating unit, a filtering unit and a battery end which are electrically connected in sequence.

[0007] Optionally, the grid-side wireless energy transmission compensation unit and the battery-side wireless energy transmission compensation unit are LCC compensation circuits.

[0008] Optionally, after the grid-end wireless energy transmission coil is powered on, according to the right-hand rule, the directions of the magnetic field generated by the grid-end wireless energy transmission coil from inside to outside are left, top, right, bottom, left, top, right, bottom, left in sequence; After the wireless energy transmission coil at the battery end is powered on, according to the right-hand rule, the directions of the magnetic field generated by the wireless energy transmission coil at the battery end from the inside out are left, bottom, right, top, left, bottom, right, top, and left.

[0009] Optionally, the car conveying mechanism includes: A plurality of power generating drive units, a first transmission member, a second transmission member and a third transmission member; The conveying channel is arranged around a plurality of storage platforms in the height direction, the first transmission member is arranged on the outside of the conveying channel, the second transmission member is arranged on the inside of the conveying channel, and the third transmission member is arranged on the outside of the car; The first transmission member is transmission-connected to a plurality of power-generating drive units, and the second transmission member is transmission-connected to a third transmission member; the plurality of power-generating drive units can drive the first transmission member to move to drive the conveying channel to move, thereby driving the car in the conveying channel to move.

[0010] Optionally, the energy storage medium delivery mechanism comprises: A horizontal energy storage medium conveying mechanism and a vertical energy storage medium conveying structure; The horizontal energy storage medium conveying mechanism comprises a first stator and a first mover, a plurality of excitation slots are spaced apart on both sides of the first mover, and the excitation coils and the driving coils are alternately arranged in the plurality of excitation slots; a magnetic isolation material is arranged in the middle of the first mover, and a plurality of moving wheels are arranged on the magnetic isolation material; The vertical energy storage medium conveying mechanism comprises a second stator and a second mover, a plurality of excitation slots are arranged at intervals on both sides of the second mover, the excitation coils and the driving coils are alternately arranged in the plurality of excitation slots, a magnetic isolation material is arranged in the middle of the second mover, and a plurality of moving wheels are arranged on the magnetic isolation material; The first mover and the second mover are arranged oppositely at the bottom and the top of the energy storage medium, and the length directions of the first mover and the second mover are perpendicular to each other.

[0011] Optionally, the hybrid gravity energy storage system further includes: The sensing module includes an energy storage medium sensing unit, a battery power sensing unit and a power grid state sensing module. The energy storage medium sensing unit is arranged at a plurality of energy storage medium parking points in the storage platform and the car, and is used to sense the energy storage medium; the battery power sensing unit is used to sense the power of the battery end on the energy storage medium; and the power grid state sensing module is used to determine the power supply state of the power grid end; The control module is used to obtain the information sensed by the sensing module; to control the car conveying mechanism and the energy storage medium conveying mechanism to convey the energy storage medium; and to control the wireless energy transmission module to transfer energy.

[0012] On the other hand, a control method of a hybrid gravity energy storage system is provided, and the control method is applicable to the hybrid gravity energy storage system as described above, comprising: Obtain the power supply status of the power grid; Generate a control instruction according to the power supply state of the power grid end, wherein the control instruction is an energy supply instruction or an energy storage instruction; The energy storage medium on the storage platform is controlled to move according to the control instructions to store energy or supply energy.

[0013] Optionally, controlling the energy storage medium on the storage platform to move according to the control instruction to store energy or supply energy includes: When the control instruction received is an energy storage instruction, the grid-side wireless energy transmission module at the energy storage medium parking point in the high-level storage platform is controlled to charge the battery end in the energy storage medium; Determine the positions of energy storage media parked on multiple storage platforms according to the sensing of the energy storage medium sensing unit; According to the power status of the energy storage medium battery terminal in the storage platform at the lower level, the energy storage medium is driven to move to the interior of the car in sequence; When it is sensed that multiple energy storage medium parking points inside the car are full of energy storage medium, the car is driven to move to a high-level storage platform; Move the energy storage medium in the car to the free energy storage medium parking points on the high-rise storage platform in sequence; The above energy storage steps are repeated until the power supply state at the grid end is sensed to be a supply balance state.

[0014] Optionally, controlling the energy storage medium on the storage platform to move according to the control instruction to store energy or supply energy includes: When the control instruction received is an energy supply instruction, the wireless energy transmission module in the storage platform at the lower level is controlled to transmit the power of the battery end to the power grid end. During the power transmission, the power of the battery end is sensed by the battery power sensing module, and the power transmission is stopped when the power of the battery end is lower than the threshold value; Determine the positions of energy storage media parked on multiple storage platforms according to the sensing of the energy storage medium sensing unit; According to the power status of the energy storage medium battery terminal in the high-rise storage platform, the energy storage medium is driven to move to the interior of the car in sequence; When it is sensed that multiple energy storage medium parking points inside the car are full of energy storage medium, the car is driven to move to a storage platform on a lower level; Move the energy storage medium in the car to the free energy storage medium parking points on the storage platform at the lower level in sequence; The above energy supply steps are repeated until it is sensed that the power supply state at the grid end is in a supply balance state.

[0015] The technical solution provided by the embodiments of the present disclosure has the following beneficial effects: In an embodiment of the present disclosure, a hybrid gravity energy storage system is provided, which includes multiple storage platforms, a car conveying mechanism, an energy storage medium conveying mechanism, and a wireless energy transmission module. Multiple energy storage medium parking points are arranged on the storage platform. When the power grid needs to store energy, the energy storage medium on the lower storage platform is moved to the higher storage platform through the car conveying mechanism and the energy storage medium conveying structure, and the electricity is converted into gravitational potential energy. At the same time, the higher storage platform can transfer the power from the power grid to the battery through the wireless energy transmission module and store it in the energy storage medium. When the power grid is insufficient and the power grid needs to be supplied, on the one hand, the energy storage medium of the higher storage platform can be moved to the storage platform on the bottom layer, and the gravitational potential energy can be converted into electric energy through the power generation drive unit of the car conveying mechanism to supply power to the power grid. On the other hand, the power stored in the energy storage medium on the lower or higher storage platform can be transferred to the power grid through the wireless energy transmission module for power supply. The hybrid gravity energy storage system provided by the present invention has high energy storage efficiency and power supply efficiency. Through the wireless function module, it can respond quickly according to the status of the power grid end, and can realize rapid power supply or rapid energy storage to the power grid end, ensuring that the power grid end can operate safely and stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A structural block diagram of a hybrid gravity energy storage system provided in an embodiment of the present disclosure; Figure 2 A structural schematic diagram of a hybrid gravity energy storage system provided in an embodiment of the present disclosure; Figure 3 A structural schematic diagram of a car conveying mechanism provided in an embodiment of the present disclosure; Figure 4 A schematic diagram of the structure of an energy storage medium provided in an embodiment of the present disclosure; Figure 5 A schematic diagram of the structure of another energy storage medium provided in an embodiment of the present disclosure; Figure 6 A schematic diagram of the structure of a horizontal energy storage medium conveying mechanism provided in an embodiment of the present disclosure; Figure 7 A schematic diagram of a storage platform provided in an embodiment of the present disclosure; Figure 8 A circuit diagram of a wireless energy transmission module provided in an embodiment of the present disclosure; Fig. 9 A schematic diagram of the structure of a wireless energy transmission coil provided in an embodiment of the present disclosure; Fig.10 A schematic diagram of the magnetic field direction of a wireless energy transmission coil provided in an embodiment of the present disclosure; Fig.11 A method flow chart of a control method for a hybrid gravity energy storage system provided in an embodiment of the present disclosure.

[0018] The reference numerals are as follows: 1: storage platform; 11: conveying channel; 12: energy storage medium; 13: energy storage medium berthing point; 131: berth marking signal point; 14: horizontal moving path; 15: vertical moving path; 2: Car transport mechanism; 21: Power generating drive unit; 22: First transmission member; 23: Second transmission member; 24: Third transmission member; 3: energy storage medium conveying mechanism; 31: horizontal energy storage medium conveying mechanism; 311: first stator; 312: first mover; 3121: excitation slot; 3122: excitation coil; 3123: driving coil; 3124: magnetic isolation material; 3125: moving wheel; 32: vertical energy storage medium conveying mechanism; 321: second stator; 322: second mover; 4: wireless energy transmission module; 41: wireless energy transmission module at the grid end; 411: grid end; 412: rectifier inverter unit; 413: voltage stabilizing unit; 414: high frequency generating unit at the grid end; 415: wireless energy transmission compensation unit at the grid end; 416: wireless energy transmission coil at the grid end; 42: wireless energy transmission module at the battery end; 421: wireless energy transmission coil at the battery end; 422: wireless energy transmission compensation unit at the battery end; 423: high frequency generating unit at the battery end; 424: filtering unit; 4241: filtering capacitor; 4242: filtering inductor; 425: battery end; 5: sensing module; 51: energy storage medium sensing unit; 52: battery power sensing unit; 53: grid status sensing module; 6: Control module. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] When the grid needs frequency regulation, it may be due to a serious shortage or surplus of electricity. If no measures are taken at this time, the grid frequency will exceed the warning value within a few to immediate seconds, causing serious accidents such as generator damage and grid collapse. It is necessary to have a unit / system that can quickly provide support and respond within 1-2 seconds to support or absorb grid power. When the power grid needs to peak, there is a small imbalance between the power supply and demand of the power grid (maybe the large-capacity power-consuming equipment is turned on or off), and the frequency may drift slowly. If no measures are taken, the power grid frequency will exceed the warning value within 5-10 minutes. The unit or equipment needs to provide support or absorption within 2 minutes to balance the power grid fluctuations. With a high proportion of new energy being connected to the grid today, the fluctuations in wind power and solar energy are more frequent (for example, a cloud blocks the sun, and the cloud drifts away after a while). The demand for peak load regulation has increased dramatically, and the potential risk of frequency regulation has also increased. In order to solve the above technical problems, the present invention provides a hybrid gravity energy storage system and a control method thereof.

[0021] Figure 1 This is a structural block diagram of a hybrid gravity energy storage system provided by an embodiment of the present disclosure. Figure 1 , the system comprises: A storage platform 1, wherein a plurality of storage platforms 1 are spaced apart in the height direction, and a plurality of energy storage medium parking points are arranged on the storage platform 1; a conveying channel 11 is arranged on the side of the storage platform, and a car is arranged in the conveying channel, and the car is used to transport the energy storage medium between the plurality of storage platforms; The car conveying mechanism 2 at least comprises a power-generating driving unit 21, wherein the power-generating driving unit 21 is used to drive the car to move in the conveying passage; when the car is in a first moving state, the power-generating driving unit 21 consumes electricity, and when the car is in a second moving state, the power-generating driving unit 21 generates electricity; The energy storage medium conveying mechanism 3 is used to move the energy storage medium between the car and the storage platform 1, and on the storage platform 1; The wireless energy transmission module 4 includes a grid-end wireless energy transmission module 41 and a battery-end wireless energy transmission module 42; the grid-end wireless energy transmission module 41 is arranged at the energy storage medium parking point of the storage platform 1, and the grid-end wireless energy transmission module 41 includes a grid end; the battery-end wireless energy transmission module 42 is arranged on the energy storage medium 1, and the battery-end wireless energy transmission module 42 includes a battery end. The grid-end wireless energy transmission module 41 and the battery-end wireless energy transmission module 42 can transmit power to each other.

[0022] In an embodiment of the present disclosure, a hybrid gravity energy storage system is provided, which includes multiple storage platforms, a car conveying mechanism, an energy storage medium conveying mechanism, and a wireless energy transmission module. Multiple energy storage medium parking points are arranged on the storage platform. When the power grid needs to store energy, the energy storage medium on the lower storage platform is moved to the higher storage platform through the car conveying mechanism and the energy storage medium conveying structure, and the electricity is converted into gravitational potential energy. At the same time, the higher storage platform can transfer the power from the power grid to the battery through the wireless energy transmission module and store it in the energy storage medium. When the power grid is insufficient and the power grid needs to be supplied, on the one hand, the energy storage medium of the higher storage platform can be moved to the storage platform on the bottom layer, and the gravitational potential energy can be converted into electric energy through the power generation drive unit of the car conveying mechanism to supply power to the power grid. On the other hand, the power stored in the energy storage medium on the lower or higher storage platform can be transferred to the power grid through the wireless energy transmission module for power supply. The hybrid gravity energy storage system provided by the present invention has high energy storage efficiency and power supply efficiency. Through the wireless function module, it can respond quickly according to the status of the power grid end, and can realize rapid power supply or rapid energy storage to the power grid end, ensuring that the power grid end can operate safely and stably.

[0023] Figure 2 A structural schematic diagram of a hybrid gravity energy storage system provided by an embodiment of the present disclosure. Figure 2 ,exist Figure 2A plurality of storage platforms 1 are shown, and the storage platforms are distributed at intervals in the height direction.

[0024] In the disclosed embodiment, the storage platforms at the lower level and the upper level are relative. Figure 2 In the embodiment, storage platforms can be divided into bottom storage platform, middle storage platform and top storage platform according to their heights. As for the bottom storage platform and the middle storage platform, the middle storage platform is a high-level storage platform relative to the bottom storage platform, and the middle storage platform is a low-level storage platform relative to the top storage platform. That is, low-level and high-level only indicate the height relationship, and do not specifically refer to a certain storage platform.

[0025] exist Figure 2 Only three layers of storage platforms are shown. In actual implementation, the number of storage platforms can be more, and the present disclosure does not limit this.

[0026] exist Figure 2 A conveying passage 11 and a plurality of elevators 111 in the conveying passage 11 are shown. In the embodiment disclosed in the present invention, a plurality of elevators are provided to improve the transportation efficiency.

[0027] Figure 3 This is a structural diagram of a car conveying mechanism provided by an embodiment of the present disclosure. Figure 3 ,exist Figure 3 The structure of the conveying channel 11 is also shown in detail.

[0028] In the disclosed embodiment, the car conveying mechanism 2 includes: A plurality of power generating drive units 21, a first transmission member 22, a second transmission member 23 and a third transmission member 24; The conveying channel 11 is arranged around a plurality of storage platforms 1 in the height direction, the first transmission member 22 is arranged on the outside of the conveying channel 11, the second transmission member 23 is arranged on the inside of the conveying channel 11, and the third transmission member 24 is arranged on the outside of the car 111; The first transmission member 22 is transmission-connected to a plurality of power-generating drive units 21, and the second transmission member 23 is transmission-connected to a third transmission member 24; the plurality of power-generating drive units 21 can drive the first transmission member 22 to move to drive the conveying channel 11 to move, thereby driving the car 111 in the conveying channel 11 to move.

[0029] In the embodiment of the present disclosure, by providing a first transmission member, a second transmission member and a third transmission member, as well as a ring-shaped conveying channel, simultaneous conveying of multiple cars can be achieved. For example, when storing energy, when the energy storage medium in the car located on the side of the high-level storage platform is conveyed, the conveying channel moves a short distance, and the next car can be moved to the high-level storage platform to continue conveying the energy storage medium.

[0030] The first transmission member 22 is a gear, the second transmission member 23 is a rack, and the third transmission member 24 is a rack.

[0031] Figure 4 A schematic diagram of the structure of an energy storage medium provided in an embodiment of the present disclosure. Figure 4 is the front view of the energy storage medium, where Figure 4 , a vertical energy storage medium conveying mechanism 32 is shown, and the vertical energy storage medium conveying mechanism 32 includes a second stator 321 and a second mover 322 .

[0032] Figure 5 This is a schematic diagram of another energy storage medium provided by an embodiment of the present disclosure. Figure 5 is a side view of the energy storage medium, where Figure 5 A horizontal energy storage medium conveying mechanism 31 is shown, and the horizontal energy storage medium conveying mechanism 31 includes a first stator 311 and a first mover 312 .

[0033] Figure 6 The schematic diagram of the structure of a horizontal energy storage medium conveying mechanism provided in an embodiment of the present disclosure is shown in FIG. The horizontal energy storage medium conveying mechanism further includes an excitation coil, a drive coil, a magnetic isolation material and a moving wheel.

[0034] It is worth noting that in the embodiment of the present disclosure, the vertical energy storage medium conveying mechanism has the same structure as the horizontal energy storage medium conveying structure.

[0035] See also Figure 4 , Figure 5 and Figure 6 , the energy storage medium conveying mechanism 3 comprises: A horizontal energy storage medium conveying mechanism 31 and a vertical energy storage medium conveying mechanism 32; The horizontal energy storage medium conveying mechanism 31 includes a first stator 311 and a first mover 312. A plurality of excitation slots 3121 are spaced apart on both sides of the first mover 312. Excitation coils 3122 and driving coils 3123 are alternately arranged in the plurality of excitation slots 3121. A magnetic isolation material 3124 is arranged in the middle of the first mover 312. A plurality of moving wheels 3125 are arranged on the magnetic isolation material 3124. The vertical energy storage medium conveying mechanism 32 includes a second stator 321 and a second mover 322, a plurality of excitation slots 3121 are spaced apart on both sides of the second mover 322, the excitation coils 3122 and the driving coils 3123 are alternately arranged in the plurality of excitation slots 3121, a magnetic isolation material 3124 is arranged in the middle of the second mover 322, and a plurality of moving wheels 3125 are arranged on the magnetic isolation material 3124; The first mover 312 and the second mover 322 are disposed oppositely at the bottom and the top of the energy storage medium 12 , and the length directions of the first mover 312 and the second mover 322 are perpendicular to each other.

[0036] In the embodiment of the present disclosure, by setting a horizontal energy storage medium conveying mechanism and a vertical energy storage medium conveying mechanism, the horizontal conveying and conveying of the energy storage medium can be realized. Among them, the stator is fixed differently during the movement of the energy storage medium, and the mover moves under the electric drive to drive the energy storage medium to move. Existing linear motors often arrange the excitation part (permanent magnet / electric excitation) and the drive coil part separately, one in the stator and the other in the mover. It is only suitable for applications with shorter strokes and smaller thrusts, such as machine tools. In the embodiment of the present disclosure, excitation slots are provided in the first mover and the second mover, and the excitation coils and the drive coils are alternately arranged in the excitation slots. Arranging the excitation coils and the drive coils in the above manner is conducive to further improving the thrust density and increasing the integration of the linear motor. The drive coils and the excitation coils are all integrated into the mover, and the long-distance stator has only a silicon steel core, which does not require permanent magnet excitation at all, and does not require the excitation coils to be arranged on the entire long stator stroke (the ordinary structure requires the excitation coils / permanent magnets to be arranged from the beginning to the end on the stator), thereby greatly saving costs. In addition, there is no need to consider the problem of segmented excitation, which simplifies the complexity of control system design. The coil, mover, wireless energy receiving coil and other structures themselves have become part of the energy storage medium, with high integration, which is conducive to saving floor space and further increasing the unit energy storage capacity.

[0037] Figure 7 A schematic diagram of a storage platform provided in an embodiment of the present disclosure. Figure 7 , Figure 7 This is a plan view of the storage platform.

[0038] A plurality of energy storage medium berthing points 13 and berth marking signal points 131 corresponding to the energy storage medium berthing points 13 are arranged on the storage platform.

[0039] The storage platform is also provided with a horizontal moving path 14 and a vertical moving path 15 .

[0040] Figure 8 A circuit diagram of a wireless energy transmission module provided in an embodiment of the present disclosure. Figure 8 The grid-end wireless energy transmission module 41 includes a grid-end 411, a rectifier inverter unit 412, a voltage stabilizing unit 413, a grid-end high frequency generating unit 413, a grid-end wireless energy transmission compensation unit 415, and a grid-end wireless energy transmission coil 416; The rectifier and inverter unit 412 has a rectifier state and an inverter state. The rectifier and inverter unit 412, the voltage stabilizing unit 413 and the grid-end high-frequency generating unit 414 are sequentially connected in parallel. The grid-end 411 is connected to the rectifier and inverter unit 412. The grid-end wireless energy transmission compensation unit 415 is connected to the grid-end high-frequency generating unit 414. The grid-end wireless energy transmission coil 416 is connected to the grid-end wireless energy transmission compensation unit 415. The battery-end wireless energy transmission module 42 includes a battery-end wireless energy transmission coil 421, a battery-end wireless energy transmission compensation unit 422, a battery-end high-frequency generation unit 423, a filtering unit 424 and a battery end 425 which are electrically connected in sequence.

[0041] In the disclosed embodiment, the rectifier inverter unit 412 is formed by IGBT, the grid-side high-frequency generating module 414 and the battery-side high-frequency generating module 423 are formed by MOSFET, and the filter unit 424 includes a filter capacitor 4241 and a filter inductor 4242 .

[0042] In the disclosed embodiment, the rectifier inverter unit connected to the power grid has good voltage resistance and large current flow, and is suitable for low frequency. The power grid frequency is generally 50Hz. The high-frequency generation module is formed by MOSFET, which has high switching frequency and low loss. The power frequency in the wireless energy transmission module is kHZ, and 85kHz, 160kHz, etc. are commonly used.

[0043] In the embodiment of the present disclosure, the grid-side wireless energy transmission compensation unit 414 and the battery-side wireless energy transmission compensation unit 424 are LCC compensation circuits.

[0044] In the disclosed embodiment, the compensation units on both sides adopt an LCC structure (i.e., one inductor and two capacitors). When the structure operates at the resonant frequency, it can be considered as a constant current source within a very large mutual inductance M and load range, making the power transmission more stable and efficient.

[0045] In the disclosed embodiment, in the charging mode, the rectifier inverter unit works in a fully rectified state. After the signal processing control module obtains the phase of the power grid through the phase-locked loop, it sends a conduction signal to the gate, and the conduction angle is about 0 degrees. Therefore, a steamed bun wave is obtained after rectification, and then after the filtering effect of the DC bus voltage stabilizing capacitor (voltage stabilizing unit), a stable DC voltage VDC is obtained. Then, it passes through the high-frequency generating unit at the grid end and is inverted into high-frequency AC power with an amplitude of VS and a frequency of f. f is the frequency at the time of inversion, which is also the resonant frequency of the wireless energy transmission system. The high-frequency generating unit at the battery end works in a fully rectified state.

[0046] In the battery feedback mode, the high-frequency generating unit at the battery end inverts the DC power of the battery into high-frequency AC power, the high-frequency generating unit at the grid end works in a fully rectified state, and the rectifier inverter unit works in an inverter state to feed back the voltage on the DC bus to the grid end.

[0047] In the disclosed embodiment, Figure 7 The component parameters in have the following relationship:

[0048]

[0049]

[0050] Fig. 9 This is a schematic diagram of the structure of a wireless energy transmission coil provided by an embodiment of the present disclosure. Figure 8 ,exist Fig. 9 The winding direction of the coil and the direction of the magnetic field after the coil is turned on are shown in FIG.

[0051] Looking from left to right, these are the winding direction of the coil from the inside to the outside and the direction of the magnetic field.

[0052] Fig.10 A schematic diagram of the magnetic field direction of a wireless energy transmission coil provided in an embodiment of the present disclosure. Fig.10 After the wireless power transmission coil at the grid end is powered on, according to the right-hand rule, the directions of the magnetic field generated by the wireless power transmission coil at the grid end from the inside out are left, up, right, down, left, up, right, down, left in sequence; After the wireless energy transmission coil at the battery end is powered on, according to the right-hand rule, the directions of the magnetic field generated by the wireless energy transmission coil at the battery end from the inside out are left, bottom, right, top, left, bottom, right, top, and left.

[0053] In the disclosed embodiment, the coil structure is arranged according to the above-mentioned magnetic field direction, so that the magnetic fields can be superimposed on one side, resulting in a significant increase in the magnetic field on this side. On the other side, the magnetic fields cancel each other out, so the magnetic field is greatly weakened. And the place where the enhancement occurs is the air gap where the coils on both sides are relative. In this way, the high-frequency magnetic energy can be more fully utilized to couple the coils on both sides, increase the air gap magnetic density and mutual inductance, achieve the magnetic concentration effect, improve the efficiency of wireless energy transmission, and save costs during resonance. In addition, the use of magnetic shielding structures can be reduced, and at the same time, the impact of the leakage magnetic field on the external environment during wireless energy transmission can be reduced, especially the impact on the adjacent linear motor. In addition, the use of this structure increases the fault tolerance for "alignment", and the deviation within a certain range (the coil center point of the wireless energy transmission coil on the power grid end and the coil center point of the wireless energy transmission coil on the battery end are completely aligned and considered to be "completely aligned") will not have a very obvious impact on the efficiency of energy transmission.

[0054] See again Figure 1 In the embodiment of the present disclosure, the hybrid gravity energy storage system further includes: The sensing module 5 includes an energy storage medium sensing unit 51, a battery power sensing unit 52 and a power grid state sensing module 53. The energy storage medium sensing unit 51 is arranged at a plurality of energy storage medium parking points in the storage platform 1 and the car 111, and is used to sense the energy storage medium 12; the battery power sensing unit 52 is used to sense the power of the battery end on the energy storage medium 12; and the power grid state sensing module 53 is used to determine the power supply state of the power grid end. The control module 6 is used to obtain the information sensed by the sensing module 5; to control the car conveying mechanism 2 and the energy storage medium conveying mechanism 3 to convey the energy storage medium 12; and to control the wireless energy transmission module 4 to transfer energy.

[0055] In the embodiment of the present disclosure, a sensing module and a control module are provided to realize automatic energy storage and automatic energy supply of the hybrid gravity energy storage system.

[0056] Fig.11 A method flow chart of a control method of a hybrid gravity energy storage system provided by an embodiment of the present disclosure. Fig.11 The method steps include: S101, obtaining the power supply status of the power grid.

[0057] In step S101, the power supply status of the power grid includes: supply balance status, surplus status, and shortage status. Among them, the supply balance status means that the power provided by the power grid matches the power required by the user; the surplus status means that the power provided by the power grid is greater than the power required by the user, and energy storage is required at this time; the shortage status means that the power of the power grid is insufficient, and power generation is required at this time.

[0058] S102: Generate a control instruction according to the power supply status of the power grid, wherein the control instruction is a power supply instruction or a power storage instruction.

[0059] In step S102, when the grid is in a supply balance state, no control command will be generated, that is, the hybrid gravity energy storage system will not be started. When the grid is in a surplus state, an energy storage command is generated to start the hybrid gravity energy storage system for energy storage. When the grid is in a deficit state, an energy supply command is generated to start the hybrid gravity energy storage system for power generation.

[0060] S103, controlling the energy storage medium on the storage platform to move according to the control instruction to store energy or supply energy.

[0061] In one example, when generating the energy storage instruction, step S103 includes: The first step is to control the grid-side wireless energy transmission module at the energy storage medium parking point in the high-level storage platform to charge the battery end in the energy storage medium when the control instruction received is an energy storage instruction.

[0062] Among them, a portion of energy storage media with low power is pre-installed in the high-level storage platform to absorb energy from the power grid in an emergency.

[0063] In addition, the energy storage medium in the high-level storage platform may also be transported from the low-level storage platform during the last transportation process. Therefore, there will be a certain loss of electricity inside the energy storage medium. The loss of electricity may be due to the last time the electricity in the energy storage medium was extracted in the low-level storage platform to supply energy to the power grid, as well as the electricity loss caused when the energy storage medium moves.

[0064] In the second step, the positions of the energy storage media parked on the multiple storage platforms are determined based on the sensing of the energy storage medium sensing unit.

[0065] The third step is to drive the energy storage medium to move into the car in sequence according to the power status of the energy storage medium battery terminal in the storage platform on the lower floor.

[0066] Among them, the energy storage medium with lower power is moved to the storage platform at a higher level first. When the energy storage medium with lower power is moved to the storage platform at a higher level.

[0067] The fourth step is to drive the car to move to a high-level storage platform when it is sensed that multiple energy storage medium parking points inside the car are full of energy storage media.

[0068] The fifth step is to move the energy storage medium in the car to the remaining energy storage medium parking points in the high-rise storage platform in turn.

[0069] In the fifth step, until the power grid reaches a state of supply and demand balance, a portion of energy storage media with low power is still retained in the high-level storage platform for the next energy storage.

[0070] For example, the number of energy storage media with low charge in the upper storage platform is 10. In the energy storage state, 5 energy storage media in the upper storage platform are charged. At the same time, 5 energy storage media with low charge in the lower storage platform are moved to the upper storage platform to make up for the number of energy storage media with low charge in the upper storage platform.

[0071] Step 6: Repeat the above energy storage steps (steps 1 to 5) until the power supply state at the grid end is sensed to be in a supply balance state.

[0072] In the disclosed embodiment, by maintaining a certain amount of energy storage medium with low charge on a high-level storage platform, rapid energy storage can be achieved in an emergency.

[0073] In another example, when generating the energy supply instruction, step S103 includes: The first step is to control the wireless energy transmission module in the lower storage platform to transfer the power at the battery end to the power grid end when the control instruction received is a power supply instruction. During the power transmission, the battery power sensing module senses the power at the battery end, and stops the power transmission when the power at the battery end is lower than the threshold.

[0074] Among them, a portion of fully charged energy storage media is pre-installed on the storage platform on the bottom layer.

[0075] In addition, the energy storage medium on the bottom storage platform may also be the fully charged energy storage medium transported down from the upper storage platform during the last power generation.

[0076] In the embodiment of the present disclosure, the threshold is used to ensure that the amount of electricity in the energy storage medium is sufficient for the next energy storage, and the energy storage medium is moved from the lower storage platform to the higher storage platform.

[0077] In the second step, the positions of the energy storage media parked on the multiple storage platforms are determined based on the sensing of the energy storage medium sensing unit.

[0078] The third step is to drive the energy storage medium to move to the interior of the car in sequence according to the power status of the energy storage medium battery terminal in the high-rise storage platform.

[0079] In the third step, fully charged energy storage media are preferentially moved to the lower storage platform.

[0080] The fourth step is to drive the car to move to the storage platform on the lower level when it is sensed that the multiple energy storage medium parking points inside the car are full of energy storage medium.

[0081] The fifth step is to move the energy storage medium in the car to the remaining energy storage medium parking points in the storage platform on the lower floor in turn.

[0082] In the fifth step, until the subsequent power grid reaches a state of supply and demand balance, a portion of energy storage media with high power is still retained in the lower storage platform for the next energy supply.

[0083] For example, the number of energy storage media with higher charges in the lower storage platform is 10. Under the energy supply state, the charge of 5 energy storage media with higher charges in the lower storage platform is extracted. At the same time, 5 energy storage media with higher charges in the higher storage platform will be moved to the lower storage platform to make up for the number of energy storage media with higher charges in the lower storage platform.

[0084] Step 6: Repeat the above energy supply steps (steps 1 to 5) until the power supply state at the grid end is sensed to be a supply balance state.

[0085] In the disclosed embodiment, a certain amount of fully charged energy storage media is always maintained on the storage platform at the lower level to ensure rapid power supply in an emergency.

[0086] In an embodiment of the present disclosure, a control method for a hybrid gravity energy storage unit is provided, through which rapid energy storage and rapid energy supply to the power grid can be achieved, thereby ensuring the safety and stability of the power grid.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hybrid gravity energy storage system, characterized in that: include: A storage platform, wherein the plurality of storage platforms are spaced apart in the height direction, and the storage platform is provided with a plurality of energy storage medium parking points; a conveying channel is provided on the side of the storage platform, and a car is provided in the conveying channel, and the car is used to transport the energy storage medium between the plurality of storage platforms; The car conveying mechanism comprises at least a power-generating driving unit, wherein the power-generating driving unit is used to drive the car to move in the conveying passage; when the car is in a first moving state, the power-generating driving unit consumes power, and when the car is in a second moving state, the power-generating driving unit generates power; An energy storage medium conveying mechanism for moving the energy storage medium between the car and the storage platform, and on the storage platform; The wireless energy transmission module includes a grid-end wireless energy transmission module and a battery-end wireless energy transmission module; the grid-end wireless energy transmission module is arranged at the energy storage medium parking point of the storage platform, and the grid-end wireless energy transmission module includes a grid end; the battery-end wireless energy transmission module is arranged on the energy storage medium, and the battery-end wireless energy transmission module includes a battery end. The grid-end wireless energy transmission module and the battery-end wireless energy transmission module can transmit power to each other.

2. The hybrid gravity energy storage system according to claim 1, characterized in that: The grid-end wireless energy transmission module includes a grid-end, a rectifier inverter unit, a voltage stabilizing unit, a grid-end high-frequency generating unit, a grid-end wireless energy transmission compensation unit, and a grid-end wireless energy transmission coil; The rectifier and inverter unit has a rectifier state and an inverter state. The rectifier and inverter unit, the voltage stabilizing unit and the grid-end high-frequency generating unit are sequentially connected in parallel. The grid end is connected to the rectifier and inverter unit. The grid-end wireless energy transmission compensation unit is connected to the grid-end high-frequency generating unit. The grid-end wireless energy transmission coil is connected to the grid-end wireless energy transmission compensation unit. The battery-end wireless energy transmission module includes a battery-end wireless energy transmission coil, a battery-end wireless energy transmission compensation unit, a battery-end high-frequency generating unit, a filtering unit and a battery end which are electrically connected in sequence.

3. The hybrid gravity energy storage system according to claim 2, characterized in that: The grid-side wireless energy transmission compensation unit and the battery-side wireless energy transmission compensation unit are LCC compensation circuits.

4. The hybrid gravity energy storage system according to claim 2, characterized in that: After the grid-end wireless energy transmission coil is powered on, according to the right-hand rule, the directions of the magnetic field generated by the grid-end wireless energy transmission coil from the inside to the outside are left, up, right, down, left, up, right, down, left in sequence; After the wireless energy transmission coil at the battery end is powered on, according to the right-hand rule, the directions of the magnetic field generated by the wireless energy transmission coil at the battery end from the inside out are left, bottom, right, top, left, bottom, right, top, and left.

5. The hybrid gravity energy storage system according to claim 1, characterized in that: The car conveying mechanism comprises: A plurality of power generating drive units, a first transmission member, a second transmission member and a third transmission member; The conveying channel is arranged around a plurality of storage platforms in the height direction, the first transmission member is arranged on the outside of the conveying channel, the second transmission member is arranged on the inside of the conveying channel, and the third transmission member is arranged on the outside of the car; The first transmission member is transmission-connected to a plurality of power-generating drive units, and the second transmission member is transmission-connected to a third transmission member; the plurality of power-generating drive units can drive the first transmission member to move to drive the conveying channel to move, thereby driving the car in the conveying channel to move.

6. The hybrid gravity energy storage system according to claim 1, characterized in that: Energy storage medium conveying mechanism, comprising: A horizontal energy storage medium conveying mechanism and a vertical energy storage medium conveying structure; The horizontal energy storage medium conveying mechanism comprises a first stator and a first mover, a plurality of excitation slots are spaced apart on both sides of the first mover, and the excitation coils and the driving coils are alternately arranged in the plurality of excitation slots; a magnetic isolation material is arranged in the middle of the first mover, and a plurality of moving wheels are arranged on the magnetic isolation material; The vertical energy storage medium conveying mechanism comprises a second stator and a second mover, a plurality of excitation slots are arranged at intervals on both sides of the second mover, the excitation coils and the driving coils are alternately arranged in the plurality of excitation slots, a magnetic isolation material is arranged in the middle of the second mover, and a plurality of moving wheels are arranged on the magnetic isolation material; The first mover and the second mover are arranged oppositely at the bottom and the top of the energy storage medium, and the length directions of the first mover and the second mover are perpendicular to each other.

7. The hybrid gravity energy storage system according to any one of claims 1 to 6, characterized in that: The hybrid gravity energy storage system also includes: The sensing module includes an energy storage medium sensing unit, a battery power sensing unit and a power grid state sensing module. The energy storage medium sensing unit is arranged at a plurality of energy storage medium parking points in the storage platform and the car, and is used to sense the energy storage medium; the battery power sensing unit is used to sense the power of the battery end on the energy storage medium; and the power grid state sensing module is used to determine the power supply state of the power grid end; The control module is used to obtain the information sensed by the sensing module; to control the car conveying mechanism and the energy storage medium conveying mechanism to convey the energy storage medium; and to control the wireless energy transmission module to transfer energy.

8. A control method for a hybrid gravity energy storage system, characterized in that: The control method is applicable to the hybrid gravity energy storage system according to claim 7, comprising: Obtain the power supply status of the power grid; Generate a control instruction according to the power supply state of the power grid end, wherein the control instruction is an energy supply instruction or an energy storage instruction; The energy storage medium on the storage platform is controlled to move according to the control instructions to store energy or supply energy.

9. The control method of the hybrid gravity energy storage system according to claim 8, characterized in that: Controlling the energy storage medium on the storage platform to move according to the control instruction to store energy or supply energy includes: When the control instruction received is an energy storage instruction, the grid-side wireless energy transmission module at the energy storage medium parking point in the high-level storage platform is controlled to charge the battery end in the energy storage medium; Determine the positions of energy storage media parked on multiple storage platforms according to the sensing of the energy storage medium sensing unit; According to the power status of the energy storage medium battery terminal in the storage platform at the lower level, the energy storage medium is driven to move to the interior of the car in sequence; When it is sensed that multiple energy storage medium parking points inside the car are full of energy storage medium, the car is driven to move to a high-level storage platform; Move the energy storage medium in the car to the free energy storage medium parking points on the high-rise storage platform in sequence; The above energy storage steps are repeated until the power supply state at the grid end is sensed to be a supply balance state.

10. The control method of the hybrid gravity energy storage system according to claim 8, characterized in that: Controlling the energy storage medium on the storage platform to move according to the control instruction to store energy or supply energy includes: When the control instruction received is an energy supply instruction, the wireless energy transmission module in the storage platform at the lower level is controlled to transmit the power of the battery end to the power grid end. During the power transmission, the power of the battery end is sensed by the battery power sensing module, and the power transmission is stopped when the power of the battery end is lower than the threshold value; Determine the positions of energy storage media parked on multiple storage platforms according to the sensing of the energy storage medium sensing unit; According to the power status of the energy storage medium battery terminal in the high-rise storage platform, the energy storage medium is driven to move to the interior of the car in sequence; When it is sensed that multiple energy storage medium parking points inside the car are full of energy storage medium, the car is driven to move to a storage platform at a lower level; Move the energy storage medium in the car to the free energy storage medium parking points on the storage platform at the lower level in sequence; The above energy supply steps are repeated until it is sensed that the power supply state at the grid end is in a supply balance state.

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