Hybrid gravity energy storage system and control method thereof

Abstract

The application provides a hybrid gravity energy storage system and a control method thereof. The system comprises a storage platform, a plurality of storage platforms are distributed in the height direction, a plurality of energy storage medium berthing points are arranged on the storage platform, a conveying channel is arranged on the side of the storage platform, a car conveying mechanism at least comprises a power generation driving unit, the power generation driving unit is used for driving the car to move in the conveying channel, in a first moving state of the car, the power generation driving unit consumes power, in a second moving state of the car, the power generation driving unit generates power, an energy storage medium conveying mechanism is used for moving the energy storage medium between the car and the storage platform and on the storage platform, a 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 the energy storage medium berthing 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 application belongs to the technical field of power grid energy storage, and particularly relates to a hybrid gravity energy storage system and a control method thereof. BACKGROUND

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

[0003] At present, the energy storage system in China mainly includes pumped storage and electrochemical battery energy storage, but the pumped storage has high environmental requirements and needs to be based on river and reservoir construction; the electrochemical battery energy storage has problems of safety and environmental damage caused by elimination of batteries. Therefore, it is urgent to provide a better energy storage mode. SUMMARY

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

[0005] In one aspect, a hybrid gravity energy storage system is provided, comprising:

[0006] A storage platform, a plurality of storage platforms are distributed at intervals in the height direction, a plurality of energy storage medium berths are arranged on the storage platform; a conveying channel is arranged on the side surface of the storage platform, and a cage is arranged in the conveying channel, and the cage is used for transferring the energy storage medium between the plurality of storage platforms;

[0007] A cage conveying mechanism, at least comprising a power-generating driving unit, the power-generating driving unit is used for driving the cage to move in the conveying channel; in a first moving state of the cage, the power-generating driving unit consumes power, and in a second moving state of the cage, the power-generating driving unit generates power;

[0008] An energy storage medium conveying mechanism, used for moving the energy storage medium between the cage and the storage platform, and on the storage platform;

[0009] A wireless energy transmission module, comprising 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 the energy storage medium berth of the storage platform, the power grid end wireless energy transmission module comprises a power grid end; the battery end wireless energy transmission module is arranged on the energy storage medium, the battery end wireless energy transmission module comprises a battery end, and the power grid end wireless energy transmission module and the battery end wireless energy transmission module can transmit power to each other.

[0010] Optionally, the power grid end wireless power transmission module comprises a power grid end, a rectifier-inverter unit, a voltage stabilizing unit, a power grid end high frequency generating unit, a power grid end wireless power transmission compensation unit, and a power grid end wireless power transmission coil.

[0011] The rectifier-inverter unit has a rectification state and an inversion state, the rectifier-inverter unit, the voltage stabilizing unit, and the power grid end high frequency generating unit are connected in parallel, the power grid end is connected with the rectifier-inverter unit, the power grid end wireless power transmission compensation unit is connected with the power grid end high frequency generating unit, and the power grid end wireless power transmission coil is connected with the power grid end wireless power transmission compensation unit.

[0012] The battery end wireless power transmission module comprises a battery end wireless power transmission coil, a battery end wireless power transmission compensation unit, a battery end high frequency generating unit, a filter unit, and a battery end, which are connected in sequence.

[0013] Optionally, the power grid end wireless power transmission compensation unit and the battery end wireless power transmission compensation unit are LCC compensation circuits.

[0014] Optionally, after the power grid end wireless power transmission coil is powered on, according to the right-hand rule, the magnetic field generated by the power grid end wireless power transmission coil from inside to outside is in the direction of left, up, right, down, left, up, right, down, and left in sequence.

[0015] After the battery end wireless power transmission coil is powered on, according to the right-hand rule, the magnetic field generated by the battery end wireless power transmission coil from inside to outside is in the direction of left, down, right, up, left, down, right, up, and left in sequence.

[0016] Optionally, the car conveying mechanism comprises:

[0017] a plurality of power-generating driving units, a first transmission member, a second transmission member, and a third transmission member;

[0018] The conveying channel is arranged around the plurality of storage platforms in the height direction, the first transmission member is arranged on the outer side of the conveying channel, the second transmission member is arranged on the inner side of the conveying channel, and the third transmission member is arranged on the outer side of the car;

[0019] The first transmission member is in transmission connection with the plurality of power-generating driving units, the second transmission member is in transmission connection with the third transmission member, and the plurality of power-generating driving 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.

[0020] Optionally, the energy storage medium conveying mechanism comprises:

[0021] a horizontal energy storage medium conveying mechanism and a vertical energy storage medium conveying structure;

[0022] The horizontal energy storage medium conveying mechanism comprises a first stator and a first mover, a plurality of excitation slots are arranged at two sides of the first mover, excitation coils and drive coils are alternately arranged in the plurality of excitation slots, a magnetic isolation material is arranged at the middle part of the first mover, and a plurality of groups of moving wheels are arranged on the magnetic isolation material.

[0023] The vertical energy storage medium conveying mechanism comprises a second stator and a second mover, a plurality of excitation slots are arranged at two sides of the second mover, excitation coils and drive coils are alternately arranged in the plurality of excitation slots, a magnetic isolation material is arranged at the middle part of the second mover, and a plurality of groups of moving wheels are arranged on the magnetic isolation material.

[0024] The first mover and the second mover are oppositely arranged 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.

[0025] Optionally, the hybrid gravity energy storage system further comprises:

[0026] The induction module comprises an energy storage medium induction unit, a battery power induction unit and a power grid state induction module, the energy storage medium induction unit is arranged at a plurality of energy storage medium parking points in the storage platform and the car, and is used for inducing the energy storage medium; the battery power induction unit is used for inducing the power of the battery end on the energy storage medium; and the power grid state induction module is used for determining the power supply state of the power grid end.

[0027] The control module is used for acquiring the information induced by the induction module, controlling the car conveying mechanism and the energy storage medium conveying mechanism to convey the energy storage medium, and controlling the wireless energy transmission module to transmit energy.

[0028] In another aspect, a control method of a hybrid gravity energy storage system is provided, the control method is suitable for the hybrid gravity energy storage system as described above, and comprises:

[0029] Acquiring the power supply state of the power grid end;

[0030] Generating a control instruction according to the power supply state of the power grid end, the control instruction being a power supply instruction or an energy storage instruction;

[0031] Controlling the energy storage medium on the storage platform to move according to the control instruction, so as to perform energy storage or energy supply.

[0032] Optionally, controlling the energy storage medium on the storage platform to move according to the control instruction, so as to perform energy storage or energy supply, comprises:

[0033] When the control instruction is the energy storage instruction, controlling the wireless energy transmission module at the power grid end of the energy storage medium parking point in the high-level storage platform to charge the battery end in the energy storage medium;

[0034] determining the positions of the energy storage media parked on the plurality of storage platforms according to the energy storage medium sensing unit;

[0035] driving the energy storage media to move into the car in sequence according to the state of charge of the battery end of the energy storage media in the low-level storage platform;

[0036] driving the car to move to the high-level storage platform when it is sensed that the plurality of energy storage medium parking points in the car are full of energy storage media;

[0037] moving the energy storage media in the car to the empty energy storage medium parking points in the high-level storage platform in sequence;

[0038] repeating the above energy storage steps until it is sensed that the power supply state of the power grid end is in a supply balance state.

[0039] Optionally, the energy storage media on the storage platform are controlled to move according to the control instruction to perform energy storage or energy supply, comprising:

[0040] when the control instruction is an energy supply instruction, controlling the wireless energy transmission module in the low-level storage platform to transfer the power of the battery end to the power grid end, and sensing the battery end charge through the battery charge sensing module during the power transfer, and stopping the power transfer when the battery end charge is lower than a threshold value;

[0041] determining the positions of the energy storage media parked on the plurality of storage platforms according to the energy storage medium sensing unit;

[0042] driving the energy storage media to move into the car in sequence according to the state of charge of the battery end of the energy storage media in the high-level storage platform;

[0043] driving the car to move to the low-level storage platform when it is sensed that the plurality of energy storage medium parking points in the car are full of energy storage media;

[0044] moving the energy storage media in the car to the empty energy storage medium parking points in the low-level storage platform in sequence;

[0045] repeating the above energy supply steps until it is sensed that the power supply state of the power grid end is in a supply balance state.

[0046] The technical scheme provided by the embodiments of the present disclosure has the following beneficial effects:

[0047] In the embodiment of the present disclosure, a hybrid gravity energy storage system is provided, which comprises a plurality of storage platforms, a car conveying mechanism, an energy storage medium conveying mechanism and a wireless energy transmission module. The storage platform is provided with a plurality of energy storage medium berths. When the power grid end needs energy storage, the energy storage medium on the lower storage platform is moved to the upper storage platform by the car conveying mechanism and the energy storage medium conveying mechanism, and the electric power is converted into gravitational potential energy. At the same time, the upper storage platform can transmit the power of the power grid end to the battery end through the wireless energy transmission module and store it in the energy storage medium. When the power grid end is in power shortage and needs to supply power to the power grid end, on the one hand, the energy storage medium on the upper storage platform can be moved to the bottom storage platform, and the gravitational potential energy can be converted into electric energy by the power generation driving unit of the car conveying mechanism to supply power to the power grid end. On the other hand, the electric power stored in the energy storage medium on the lower or upper storage platform can be transmitted to the power grid end through the wireless energy transmission module to supply power. The hybrid gravity energy storage system provided by the present application has high energy storage efficiency and power supply efficiency. Through the wireless function module, the state of the power grid end can be quickly responded, the power supply or energy storage of the power grid end can be quickly realized, and the safe and stable operation of the power grid end can be ensured. BRIEF DESCRIPTION OF DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0049] Figure 1 A structural block diagram of a hybrid gravity energy storage system provided by the embodiment of the present disclosure is provided.

[0050] Figure 2 A structural schematic diagram of a hybrid gravity energy storage system provided by the embodiment of the present disclosure is provided.

[0051] Figure 3 A structural schematic diagram of a car conveying mechanism provided by the embodiment of the present disclosure is provided.

[0052] Figure 4 A structural schematic diagram of an energy storage medium provided by the embodiment of the present disclosure is provided.

[0053] Figure 5 A structural schematic diagram of another energy storage medium provided by the embodiment of the present disclosure is provided.

[0054] Figure 6 A structural schematic diagram of a horizontal energy storage medium conveying mechanism provided by the embodiment of the present disclosure is provided.

[0055] Figure 7 A schematic diagram of a storage platform according to an embodiment of the present disclosure;

[0056] Figure 8 A circuit diagram of a wireless energy transmission module according to an embodiment of the present disclosure;

[0057] Figure 9 A structural schematic diagram of a wireless energy transmission coil according to an embodiment of the present disclosure;

[0058] Figure 10 A schematic diagram of the magnetic field direction of a wireless energy transmission coil according to an embodiment of the present disclosure;

[0059] Figure 11 A method flowchart of a control method of a hybrid gravity energy storage system according to an embodiment of the present disclosure.

[0060] The reference signs are as follows:

[0061] 1: storage platform; 11: conveying channel; 12: energy storage medium; 13: energy storage medium docking point; 131: docking marker signal point; 14: horizontal movement path; 15: vertical movement path;

[0062] 2: car conveying mechanism; 21: power-generating drive unit; 22: first transmission member; 23: second transmission member; 24: third transmission member;

[0063] 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: drive coil; 3124: magnetic isolation material; 3125: moving wheel; 32: vertical energy storage medium conveying mechanism; 321: second stator; 322: second mover;

[0064] 4: wireless energy transmission module; 41: grid-side wireless energy transmission module; 411: grid side; 412: rectifier-inverter unit; 413: voltage stabilizing unit; 414: grid-side high-frequency generating unit; 415: grid-side wireless energy transmission compensation unit; 416: grid-side wireless energy transmission coil; 42: battery-side wireless energy transmission module; 421: battery-side wireless energy transmission coil; 422: battery-side wireless energy transmission compensation unit; 423: battery-side high-frequency generating unit; 424: filter unit; 4241: filter capacitor; 4242: filter inductor; 425: battery side;

[0065] 5: sensing module; 51: energy storage medium sensing unit; 52: battery power sensing unit; 53: grid state sensing module;

[0066] 6: control module. DETAILED DESCRIPTION

[0067] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the drawings in the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0068] When the power grid needs to be frequency-regulated, it may be that there is a serious shortage or surplus of electricity. At this time, if no measures are taken, the frequency of the power grid will exceed the warning value in a few to instant seconds, causing serious accidents such as generator damage and power grid collapse. Therefore, a unit / system capable of providing support quickly is needed to make a corresponding response within 1-2 seconds to support or absorb the power grid power;

[0069] When the power grid needs to be peak-regulated, the power supply and demand of the power grid are slightly unbalanced (possibly because a large-capacity electrical equipment is started or stopped), and the frequency may slowly drift. If no measures are taken, the frequency of the power grid will exceed the warning value within 5-10 minutes, and a unit or device is needed to provide support or absorption within 2 minutes to balance the fluctuation of the power grid.

[0070] In the current situation of high proportion of new energy grid connection, the fluctuations of wind power and solar power are more frequent (for example, a cloud blocks the sun, and then the cloud drifts away after a while), which greatly increases the demand for peak regulation and increases the potential risk of frequency regulation. To solve the above technical problems, the present application provides a hybrid gravity energy storage system and a control method thereof.

[0071] Figure 1 A structural block diagram of a hybrid gravity energy storage system provided by the embodiments of the present disclosure is provided. Referring to Figure 1 The system comprises:

[0072] A storage platform 1, a plurality of storage platforms 1 are distributed at intervals in the height direction, and a plurality of energy storage medium berths are arranged on the storage platform 1; the side surface of the storage platform is provided with a conveying channel 11, and a car is arranged in the conveying channel; the car is used for transferring the energy storage medium between the plurality of storage platforms;

[0073] A car conveying mechanism 2, at least comprising a power-generating driving unit 21, the power-generating driving unit 21 is used to drive the car to move in the conveying channel; in a first moving state of the car, the power-generating driving unit 21 consumes power; in a second moving state of the car, the power-generating driving unit 21 generates power;

[0074] An energy storage medium conveying mechanism 3, used for moving the energy storage medium between the car and the storage platform 1, and on the storage platform 1;

[0075] The wireless energy transmission module 4 includes a grid-side wireless energy transmission module 41 and a battery-side wireless energy transmission module 42. The grid-side wireless energy transmission module 41 is arranged at the energy storage medium parking point of the storage platform 1, and includes a grid-side. The battery-side wireless energy transmission module 42 is arranged on the energy storage medium 1, and includes a battery-side. The grid-side wireless energy transmission module 41 and the battery-side wireless energy transmission module 42 can transmit power to each other.

[0076] In the embodiment of the present disclosure, a hybrid gravity energy storage system is provided, which includes a plurality of storage platforms, a car conveying mechanism, an energy storage medium conveying mechanism, and a wireless energy transmission module. The storage platform is provided with a plurality of energy storage medium parking points. When the grid side needs energy storage, the energy storage medium on the lower storage platform is moved to the upper storage platform by the car conveying mechanism and the energy storage medium conveying mechanism, and the power is converted into gravitational potential energy. At the same time, the upper storage platform can transmit the power of the grid side to the battery side through the wireless energy transmission module and store it in the energy storage medium. When the grid side is in power shortage and needs to supply power to the grid side, on the one hand, the energy storage medium on the upper storage platform can be moved to the bottom storage platform, and the gravitational potential energy is converted into electrical energy by the power generation driving unit of the car conveying mechanism to supply power to the grid side. On the other hand, the power stored in the energy storage medium on the lower or upper storage platform can be transmitted to the grid side through the wireless energy transmission module to supply power. The hybrid gravity energy storage system provided by the present application has high energy storage efficiency and power supply efficiency. Through the wireless function module, the grid side can be quickly responded according to the state of the grid side, and the quick power supply or quick energy storage of the grid side can be realized to ensure the safe and stable operation of the grid side.

[0077] Figure 2 A structural schematic diagram of a hybrid gravity energy storage system provided by the embodiment of the present disclosure is shown in Figure 2 A plurality of storage platforms 1 are shown in Figure 2 The storage platforms are distributed at intervals in the height direction.

[0078] In the embodiment of the present disclosure, the lower and upper storage platforms are relative. For example, in Figure 2 According to the height of the storage platform, the bottom storage platform, the middle storage platform and the top storage platform can be divided. For the bottom storage platform and the middle storage platform, the middle storage platform is the upper storage platform relative to the bottom storage platform, and the middle storage platform is the lower storage platform relative to the top storage platform. That is, the lower and upper only represent the height relationship, and do not specifically refer to a certain layer of storage platform.

[0079] In Figure 2Only 3 layers of storage platforms are shown in the figure, but in actual implementation, the number of storage platforms can be more, and the present disclosure does not limit this.

[0080] In Figure 2 In the figure, a conveying channel 11 and multiple cars 111 in the conveying channel 11 are also shown. In the embodiment of the present disclosure, multiple cars are provided to improve transportation efficiency.

[0081] Figure 3 A structural schematic diagram of a car conveying mechanism provided in the embodiment of the present disclosure is shown in the figure. Figure 3 In Figure 3 The structure of the conveying channel 11 is also shown in the figure.

[0082] In the embodiment of the present disclosure, the car conveying mechanism 2 comprises:

[0083] Multiple power-generating driving units 21, a first transmission member 22, a second transmission member 23, and a third transmission member 24;

[0084] The conveying channel 11 is arranged around the multiple storage platforms 1 in the height direction, the first transmission member 22 is arranged on the outer side of the conveying channel 11, the second transmission member 23 is arranged on the inner side of the conveying channel 11, and the third transmission member 24 is arranged on the outer side of the car 111.

[0085] The first transmission member 22 is in transmission connection with the multiple power-generating driving units 21, the second transmission member 23 is in transmission connection with the third transmission member 24, and the multiple power-generating driving 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.

[0086] In the embodiment of the present disclosure, by arranging the first transmission member, the second transmission member, and the third transmission member, and the annular conveying channel, simultaneous conveying of multiple cars can be achieved. For example, when the conveying of the energy storage medium in the car on the side of the high-level storage platform is completed, the conveying channel is moved by a small distance, and the next car is moved to the high-level storage platform to continue the conveying of the energy storage medium.

[0087] 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.

[0088] Figure 4 A structural schematic diagram of an energy storage medium provided in the embodiment of the present disclosure is shown in the figure. Figure 4 A front view of the energy storage medium is shown in the figure. Figure 4 The vertical energy storage medium conveying mechanism 32 is shown in the figure, which comprises a second stator 321 and a second rotor 322.

[0089] Figure 5 Another structure diagram of the energy storage medium provided by the embodiment of the present disclosure is shown. Wherein, Figure 5 A side view of the energy storage medium is shown. Wherein Figure 5 A horizontal energy storage medium conveying mechanism 31 is shown, which includes a first stator 311 and a first mover 312.

[0090] Figure 6 A structure diagram of a horizontal energy storage medium conveying mechanism provided by the embodiment of the present disclosure is shown. Wherein, the horizontal energy storage medium conveying mechanism further includes an excitation coil, a driving coil, a magnetic isolation material and a moving wheel.

[0091] It is worth noting that in the embodiment of the present disclosure, the structure of the vertical energy storage medium conveying mechanism is the same as that of the horizontal energy storage medium conveying structure.

[0092] Meanwhile, referring to Figure 4 , Figure 5 and Figure 6 , the energy storage medium conveying mechanism 3 includes:

[0093] The horizontal energy storage medium conveying mechanism 31 and the vertical energy storage medium conveying structure 32;

[0094] The horizontal energy storage medium conveying mechanism 31 includes a first stator 311 and a first mover 312, and a plurality of excitation slots 3121 are provided on both sides of the first mover 312 with a spacing, and excitation coils 3122 and driving coils 3123 are alternately arranged in the plurality of excitation slots 3121; a magnetic isolation material 3124 is provided in the middle of the first mover 312, and a plurality of sets of moving wheels 3125 are provided on the magnetic isolation material 3124;

[0095] The vertical energy storage medium conveying mechanism 32 includes a second stator 321 and a second mover 322, and a plurality of excitation slots 3121 are provided on both sides of the second mover 322 with a spacing, and excitation coils 3122 and driving coils 3123 are alternately arranged in the plurality of excitation slots 3121; a magnetic isolation material 3124 is provided in the middle of the second mover 322, and a plurality of sets of moving wheels 3125 are provided on the magnetic isolation material 3124;

[0096] The first mover 312 and the second mover 322 are oppositely arranged at the bottom and top of the energy storage medium 12, and the length direction of the first mover 312 and the second mover 322 is perpendicular to each other.

[0097] In the embodiment of the present disclosure, the horizontal energy storage medium conveying mechanism and the vertical energy storage medium conveying mechanism are arranged, so that the horizontal conveying and conveying conveying of the energy storage medium can be realized. The stator is fixed during the movement of the energy storage medium, and the mover moves under the action of electric power to drive the movement of the energy storage medium. The existing linear motor often arranges the excitation part (permanent magnet / electric excitation) and the driving coil part separately, one in the stator and one in the mover. It is only suitable for short stroke and small thrust application occasions, such as machine tools. In the embodiment of the present disclosure, the excitation slot is arranged in the first mover and the second mover, and the excitation coil and the driving coil are arranged in the excitation slot alternately. Arranging the excitation coil and the driving coil in the above manner is conducive to further improving the thrust density and increasing the integration of the linear motor. The driving coil and the excitation coil are integrated into the mover, and the long-stroke stator only has a silicon steel core, without the need for permanent magnet excitation and without the need for arranging excitation coils on the entire long-stator stroke (ordinary structure needs to arrange excitation coils / permanent magnets from the beginning to the end on the stator), thereby greatly saving the cost. In addition, the problem of segmented excitation does not need to be considered, and the complexity of the control system design is simplified. The coil, the mover, the wireless energy transmission receiving coil and other structures are also part of the energy storage medium, which has high integration and is conducive to saving the floor area and further increasing the unit energy storage capacity.

[0098] Figure 7 A schematic diagram of a storage platform is provided for the embodiment of the present disclosure. Referring to Figure 7 , Figure 7 A plan view of the storage platform.

[0099] The storage platform is provided with a plurality of energy storage medium berthing points 13 and berth marker signal points 131 corresponding to the energy storage medium berthing points 13.

[0100] The storage platform also has a horizontal movement path 14 and a vertical movement path 15.

[0101] Figure 8 A circuit diagram of a wireless energy transmission module is provided for the embodiment of the present disclosure. Referring to Figure 8 , the power grid end wireless energy transmission module 41 includes a power grid end 411, a rectifier inverter unit 412, a voltage stabilizing unit 413, a power grid end high frequency generating unit 413, a power grid end wireless energy transmission compensation unit 415, and a power grid end wireless energy transmission coil 416;

[0102] The rectification-inversion unit 412 has a rectification state and an inversion state, the rectification-inversion unit 412, the voltage stabilization unit 413 and the grid-end high-frequency generating unit 414 are connected in parallel in sequence, the grid end 411 is connected with the rectification-inversion unit 412, the grid-end wireless energy transmission compensation unit 415 is connected with the grid-end high-frequency generating unit 414, and the grid-end wireless energy transmission coil 416 is connected with the grid-end wireless energy transmission compensation unit 415.

[0103] The battery-end wireless energy transmission module 42 comprises a battery-end wireless energy transmission coil 421, a battery-end wireless energy transmission compensation unit 422, a battery-end high-frequency generating unit 423, a filter unit 424 and a battery end 425 connected in sequence.

[0104] In the embodiment of the present disclosure, the rectification-inversion unit 412 is composed of IGBT, the grid-end high-frequency generating module 414 and the battery-end high-frequency generating module 423 are formed by MOSFET, and the filter unit 424 comprises a filter capacitor 4241 and a filter inductor 4242.

[0105] In the embodiment of the present disclosure, the rectification-inversion unit connected with the grid has good voltage resistance and large current, is suitable for low frequency, and the frequency of the grid is generally 50 Hz. The high-frequency generating module is formed by MOSFET, has high switching frequency and small loss, and the frequency in the wireless energy transmission module is kHZ, commonly 85 kHz, 160 kHz, etc.

[0106] In the embodiment of the present disclosure, the grid-end wireless energy transmission compensation unit 414 and the battery-end wireless energy transmission compensation unit 424 are LCC compensation circuits.

[0107] In the embodiment of the present disclosure, the compensation units on both sides adopt LCC structure (i.e. one inductor and two capacitors), which can be regarded as a constant current source in a very large mutual inductance M and load range when working at the resonant frequency, so that the power transmission is more stable and efficient.

[0108] In the embodiment of the present disclosure, in the charging mode, the rectification-inversion unit works in the complete rectification state, the signal processing control module sends a conduction signal to the gate after obtaining the phase of the grid through the phase-locked loop, and the conduction angle is about 0 degree, so that a steamed bun wave is obtained after rectification, and then a stable direct current voltage VDC is obtained after the filtering effect of the direct current bus voltage stabilization capacitor (voltage stabilization unit). Then, the grid-end high-frequency generating unit inverts it into high-frequency alternating current with an amplitude of VS and a frequency of f, f is the frequency when inverting, and is also the resonant frequency of the wireless energy transmission system, and the battery-end high-frequency generating unit works in the complete rectification state.

[0109] In the battery feedback mode, the battery end high frequency generating unit inverses the direct current of the battery into high frequency alternating current, the grid end high frequency generating unit works in the complete rectification state, and the rectification inversion unit works in the inversion state to feedback the voltage on the direct current bus to the grid end.

[0110] In the embodiments of the present disclosure, Figure 7 The element parameters in the formula (1) have the following relationship:

[0111]

[0112]

[0113]

[0114] Figure 9 A structural schematic diagram of a wireless energy transmission coil is provided in the embodiments of the present disclosure. Referring to FIG. 1, Figure 8 The winding direction of the coil and the magnetic field direction after the coil is turned on are shown in FIG. 1. Figure 9 The winding direction of the coil and the magnetic field direction after the coil is turned on are shown in FIG. 1.

[0115] From left to right, the winding direction of the coil from inside to outside and the magnetic field direction are shown in FIG. 1.

[0116] Figure 10 A structural schematic diagram of a wireless energy transmission coil is provided in the embodiments of the present disclosure. Referring to FIG. 1, Figure 10 According to the right-hand rule, the magnetic field direction generated by the grid end wireless energy transmission coil from inside to outside is left, up, right, down, left, up, right, down, left in sequence after the grid end wireless energy transmission coil is turned on.

[0117] According to the right-hand rule, the magnetic field direction generated by the battery end wireless energy transmission coil from inside to outside is left, down, right, up, left, down, right, up, left in sequence after the battery end wireless energy transmission coil is turned on.

[0118] In the embodiment of the present disclosure, the coil structure is arranged according to the magnetic field direction as described above, so that the magnetic fields on one side are superimposed on each other, resulting in a substantial increase in the magnetic field on this side. While the magnetic fields on the other side cancel each other out, thus greatly weakening the magnetic field. Moreover, the enhanced place is the air gap opposite the two sides of the coil. 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 effect of concentrating magnetic field, improve the efficiency of wireless energy transmission, and save the cost during resonance. In addition, the use of magnetic shielding structure can be reduced, and at the same time, the influence of the leakage magnetic field on the external environment during wireless energy transmission can be reduced, especially the influence on the adjacent linear motor. In addition, the use of this structure increases the fault tolerance for "alignment". A certain range of deviation (the center points of the coil of the power grid end wireless energy transmission coil and the coil of the battery end wireless energy transmission coil are completely aligned, which is considered as "complete alignment") will not have a very obvious impact on the efficiency of energy transmission.

[0119] Referring again to Figure 1 In the embodiment of the present disclosure, the hybrid gravity energy storage system further comprises:

[0120] The induction module 5 comprises an energy storage medium induction unit 51, a battery power induction unit 52, and a power grid state induction module 53. The energy storage medium induction 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 for inducing the energy storage medium 12. The battery power induction unit 52 is used for inducing the power of the battery end on the energy storage medium 12. The power grid state induction module 53 is used for determining the power supply state of the power grid end.

[0121] The control module 6 is used for acquiring the information induced by the induction module 5, controlling the car conveying mechanism 2 and the energy storage medium conveying mechanism 3 to convey the energy storage medium 12, and controlling the wireless energy transmission module 4 to transmit energy.

[0122] In the embodiment of the present disclosure, the induction module and the control module are arranged, so that the automatic energy storage and automatic energy supply of the hybrid gravity energy storage system can be realized.

[0123] Figure 11 A method flowchart of a control method of a hybrid gravity energy storage system provided in the embodiment of the present disclosure. Referring to Figure 11 The method steps comprise:

[0124] S101, acquiring the power supply state of the power grid end.

[0125] In step S101, the power supply state of the grid side includes: supply balance state, surplus state, and shortage state. The supply balance state means that the power provided by the grid side matches the power required by the user; the surplus state means that the power provided by the grid side is greater than the power required by the user, and energy storage is needed at this time; and the shortage state means that the power of the grid side is insufficient, and power generation is needed at this time.

[0126] In step S102, a control instruction is generated according to the power supply state of the grid side, and the control instruction is an energy supply instruction or an energy storage instruction.

[0127] In step S102, when the grid side is in the supply balance state, no control instruction is generated, that is, the hybrid gravity energy storage system is not started. When the grid side is in the surplus state, an energy storage instruction is generated, and the hybrid gravity energy storage system is started for energy storage. When the grid side is in the shortage state, an energy supply instruction is generated, and the hybrid gravity energy storage system is started for power generation.

[0128] In step S103, the energy storage medium on the storage platform is moved according to the control instruction to perform energy storage or energy supply.

[0129] In an example, when the energy storage instruction is generated, step S103 includes:

[0130] Firstly, when the control instruction is the 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 side of the energy storage medium.

[0131] Preferably, a part of the energy storage medium with low power is pre-set in the high-level storage platform, which is used to absorb the energy of the grid side in an emergency state.

[0132] In addition, the energy storage medium in the high-level storage platform can also be transported from the low-level storage platform in the last transportation process, so that the internal power of the energy storage medium is lost. The power loss can be caused by the extraction of the power of the energy storage medium for the grid side in the last transportation process in the low-level storage platform, and the power loss caused by the movement of the energy storage medium.

[0133] Secondly, the positions of the energy storage media parked on the plurality of storage platforms are determined according to the sensing of the energy storage medium sensing unit.

[0134] Thirdly, the energy storage media are driven to move into the car interior in sequence according to the power states of the battery sides of the energy storage media in the low-level storage platform.

[0135] Preferably, the energy storage medium with low power is preferentially moved to the high-level storage platform. When the energy storage medium with low power is moved to the high-level storage platform.

[0136] The fourth step is to drive the car to move to the high-level storage platform when the multiple energy storage medium parking points inside the car are full of energy storage medium.

[0137] The fifth step is to move the energy storage medium in the car to the empty energy storage medium parking point of the high-level storage platform in turn.

[0138] In the fifth step, until the subsequent power grid end reaches the supply and demand balance state, a part of the energy storage medium with low power is still reserved in the high-level storage platform for the next energy storage.

[0139] For example, the number of energy storage medium with low power in the high-level storage platform is 10, and 5 energy storage medium in the high-level storage platform is charged in the energy storage state, and at the same time, 5 energy storage medium with low power in the low-level storage platform is moved to the high-level storage platform to make up the number of energy storage medium with low power in the high-level storage platform.

[0140] The sixth step is to repeat the above energy storage steps (the first step to the fifth step) until the power supply state of the power grid end is the supply balance state.

[0141] In the embodiment of the present disclosure, by keeping a certain number of energy storage medium with low power in the high-level storage platform, fast energy storage in emergency state can be realized.

[0142] In another example, when the energy supply instruction is generated, step S103 includes:

[0143] The first step is to control the wireless energy transmission module in the low-level storage platform to transfer the power of the battery end to the power grid end when the control instruction is the energy supply instruction, and the battery power is sensed by the battery power sensing module during the power transmission, and the power transmission is stopped when the battery power is lower than the threshold.

[0144] Among them, a part of the full-power energy storage medium is pre-set on the bottom-level storage platform.

[0145] In addition, the energy storage medium on the bottom-level storage platform can also be the full-power energy storage medium transported from the high-level storage platform last time.

[0146] In the embodiment of the present disclosure, the threshold is used to ensure that the power in the energy storage medium can be moved from the low-level storage platform to the high-level storage platform for the next energy storage.

[0147] The second step is to determine the position of the energy storage medium parked on the multiple storage platforms according to the energy storage medium sensing unit.

[0148] The third step is to drive the energy storage medium to move into the car according to the power state of the battery end of the energy storage medium in the high-level storage platform.

[0149] In the third step, the full-energy storage medium is preferentially moved to the low-layer storage platform.

[0150] In the fourth step, when it is sensed that the multiple storage medium parking spaces in the car are full of storage medium, the car is driven to the low-layer storage platform.

[0151] In the fifth step, the storage medium in the car is sequentially moved to the empty storage medium parking space in the low-layer storage platform.

[0152] In the fifth step, until the supply-demand balance state of the power grid end is reached, a part of the high-energy storage medium is still reserved in the low-layer storage platform for the next energy supply.

[0153] For example, the number of high-energy storage medium in the low-layer storage platform is 10, and in the energy supply state, the electricity of 5 high-energy storage medium in the low-layer storage platform is extracted, and at the same time, 5 high-energy storage medium in the high-layer storage platform is moved to the low-layer storage platform to make up the number of high-energy storage medium in the low-layer storage platform.

[0154] In the sixth step, the above energy supply steps (first step to fifth step) are repeated until the power supply state of the power grid end is in the supply balance state.

[0155] In the embodiments of the present disclosure, by always keeping a certain number of full-energy storage medium in the low-layer storage platform, the power supply in the emergency state can be ensured to be fast.

[0156] In the embodiments of the present disclosure, a control method of a hybrid gravity energy storage unit is provided, and through the control method, the fast energy storage and fast energy supply of the power grid end can be realized, and the safety and stability of the power grid end can be ensured.

[0157] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A hybrid gravity energy storage system, characterized in that, The application relates to a storage platform, a plurality of storage platforms are distributed in a height direction, a plurality of energy storage medium berths are arranged on the storage platforms, a conveying channel is arranged on the side of the storage platform, a car is arranged in the conveying channel, and the car is used for transferring the energy storage medium between the plurality of storage platforms. The car conveying mechanism comprises at least a power-generating driving unit, the power-generating driving unit is used for driving the car to move in the conveying channel, the car is in a first moving state, the power-generating driving unit consumes power, and the car is in a second moving state, the power-generating driving unit generates power. The car conveying mechanism comprises: A plurality of power-generating driving units, a first transmission member, a second transmission member and a third transmission member. The conveying channel is arranged around the plurality of storage platforms in the height direction, the first transmission member is arranged on the outer side of the conveying channel, the second transmission member is arranged on the inner side of the conveying channel, and the third transmission member is arranged on the outer side of the car. The first transmission member is in transmission connection with the plurality of power-generating driving units, the second transmission member is in transmission connection with the third transmission member, the plurality of power-generating driving units can drive the first transmission member to move so as to drive the conveying channel to move, and thus the car in the conveying channel is driven to move. An energy storage medium conveying mechanism is used for moving the energy storage medium between the car and the storage platform and on the storage platform. A wireless energy transmission module comprises a grid-side wireless energy transmission module and a battery-side wireless energy transmission module, the grid-side wireless energy transmission module is arranged at the energy storage medium berth of the storage platform, the grid-side wireless energy transmission module comprises a grid side, the battery-side wireless energy transmission module is arranged on the energy storage medium, the battery-side wireless energy transmission module comprises a battery side, and the grid-side wireless energy transmission module and the battery-side wireless energy transmission module can transmit power to each other. A control module is used for controlling the car conveying mechanism and the energy storage medium conveying mechanism to convey the energy storage medium and for controlling the wireless energy transmission module to transmit energy. The control module controls the energy storage medium on the storage platform to move according to a control instruction, so as to perform the steps of energy storage or energy supply, and the steps comprise the following steps. When the control instruction is an energy storage instruction, the grid-side wireless energy transmission module at the energy storage medium berth in the upper storage platform is controlled to charge the battery side in the energy storage medium. The positions of the energy storage media berthed on the plurality of storage platforms are determined. According to the power states of the battery sides of the energy storage media in the lower storage platform, the energy storage media are driven to move into the car in sequence. When it is sensed that the plurality of energy storage medium berths in the car are full of energy storage media, the car is driven to move to the upper storage platform. The energy storage media in the car are moved to the empty energy storage medium berths in the upper storage platform in sequence. The above energy storage steps are repeated until the energy supply state of the grid side is in a supply balance state. The grid-side wireless energy transmission module comprises a grid side, a rectifier-inverter unit, a voltage stabilizing unit, a grid-side high-frequency generating unit, a grid-side wireless energy transmission compensation unit and a grid-side wireless energy transmission coil.

2. The hybrid gravity accumulators system of claim 1, wherein, ​ The rectification inversion unit has a rectification state and an inversion state, the rectification inversion unit, the voltage stabilization unit and the grid end high frequency generation unit are connected in parallel, the grid end is connected with the rectification inversion unit, the grid end wireless energy transmission compensation unit is connected with the grid end high frequency generation unit, and the grid end wireless energy transmission coil is connected with the grid end wireless energy transmission compensation unit. The battery end wireless energy transmission module comprises the battery end wireless energy transmission coil, the battery end wireless energy transmission compensation unit, the battery end high frequency generation unit, the filter unit and the battery end which are sequentially electrically connected.

3. The hybrid gravity accumulators system of claim 2, wherein, The grid end wireless energy transmission compensation unit and the battery end wireless energy transmission compensation unit are LCC compensation circuits.

4. The hybrid gravity accumulators system of claim 2, wherein, After the grid end wireless energy transmission coil is powered on, according to the right-hand rule, the magnetic field directions generated by the grid end wireless energy transmission coil from inside to outside are left, up, right, down, left, up, right, down and left in turn. After the battery end wireless energy transmission coil is powered on, according to the right-hand rule, the magnetic field directions generated by the battery end wireless energy transmission coil from inside to outside are left, down, right, up, left, down, right, up and left in turn.

5. The hybrid gravity power storage system of claim 1, wherein, The energy storage medium conveying mechanism comprises: horizontal energy storage medium conveying mechanism and 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 arranged on both sides of the first mover, and excitation coils and drive coils are alternately arranged in the plurality of excitation slots; a magnetic isolation material is arranged on the middle part of the first mover, and a plurality of groups 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 on both sides of the second mover, excitation coils and drive coils are alternately arranged in the plurality of excitation slots, a magnetic isolation material is arranged on the middle part of the second mover, and a plurality of groups of moving wheels are arranged on the magnetic isolation material; The first mover and the second mover are oppositely arranged 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.

6. Hybrid gravity accumulator system according to any of claims 1 to 5, characterized in that The hybrid gravity energy storage system further comprises: The induction module comprises an energy storage medium induction unit, a battery power induction unit and a grid state induction module, the energy storage medium induction unit is arranged at a plurality of energy storage medium parking points in the storage platform and the car body, and is used for inducing the energy storage medium; the battery power induction unit is used for inducing the power of the battery end on the energy storage medium; and the grid state induction module is used for determining the power supply state of the grid end.

7. A control method of a hybrid gravity energy storage system, characterized by, The control method is suitable for the hybrid gravity energy storage system according to any one of claims 1 to 6, and comprises: obtaining the power supply state of the grid end; generating a control instruction according to the power supply state of the grid end, wherein the control instruction is a power supply instruction or an energy storage instruction; controlling the movement of the energy storage medium on the storage platform according to the control instruction to perform energy storage or power supply; controlling the movement of the energy storage medium on the storage platform according to the control instruction to perform energy storage or power supply, which comprises: when the control instruction is an energy storage instruction, controlling the grid end 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; Determine the position of the energy storage medium parked on the multiple storage platforms; According to the state of the battery end of the energy storage medium in the lower storage platform, drive the energy storage medium to move into the car in turn; When it is sensed that the multiple energy storage medium parking points inside the car are full of energy storage medium, drive the car to move to the high-level storage platform; In turn, move the energy storage medium in the car to the empty energy storage medium parking point in the high-level storage platform; Repeat the above energy storage steps until the power supply state of the grid end is in a supply balance state.

8. The control method of a hybrid gravity energy storage system according to claim 7, characterized in that, According to the control instruction, control the movement of the energy storage medium on the storage platform to store energy or supply energy, comprising: When receiving the control instruction as the energy supply instruction, control the wireless energy transmission module in the lower storage platform to transfer the power at the battery end to the grid end, and sense the battery end power through the battery power sensing module during the power transfer, and stop the power transfer when the battery end power is lower than the threshold value; Determine the position of the energy storage medium parked on the multiple storage platforms according to the sensing of the energy storage medium sensing unit; According to the state of the battery end of the energy storage medium in the lower storage platform, drive the energy storage medium to move into the car in turn; When it is sensed that the multiple energy storage medium parking points inside the car are full of energy storage medium, drive the car to move to the high-level storage platform; In turn, move the energy storage medium in the car to the empty energy storage medium parking point in the high-level storage platform; Repeat the above energy storage steps until the power supply state of the grid end is in a supply balance state.

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