CN114094610A - Energy storage device and control method thereof - Google Patents
Energy storage device and control method thereof Download PDFInfo
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- CN114094610A CN114094610A CN202111360405.2A CN202111360405A CN114094610A CN 114094610 A CN114094610 A CN 114094610A CN 202111360405 A CN202111360405 A CN 202111360405A CN 114094610 A CN114094610 A CN 114094610A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/30—Arrangements for balancing of the load in a network by storage of energy using dynamo-electric machines coupled to flywheels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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Abstract
The embodiment of the invention discloses an energy storage device and a control method of the energy storage device, wherein the energy storage device is arranged between an input end and an output end of a power grid and comprises an input switch, an output switch and an energy storage structure; the input end of the input switch is used for being connected with the input end of a power grid, the output end of the output switch is used for being connected with the output end of the power grid, and the output end of the input switch is connected with the input end of the output switch; the energy storage structure comprises at least one flywheel energy storage part, at least one generator and at least one lifting device, wherein each flywheel energy storage part is connected to a node between the output end of the input switch and the input end of the output switch, each lifting device is connected to the node through the generator, each lifting device is connected with a preset number of generators, the generators are used for supplying power for lifting the energy storage parts to the lifting devices, and the lifting devices are used for transferring the energy storage parts to drive the generators to rotate to generate electric energy.
Description
Technical Field
The invention relates to the field of energy storage, in particular to an energy storage device and a control method of the energy storage device.
Background
The power generation, transmission, distribution and utilization processes of the power system are completed synchronously, so that the peak regulation and frequency modulation are required to be carried out on the power grid to ensure the power generation and utilization balance of the power grid, and further ensure the reliable operation of power generation equipment and power utilization equipment.
The flywheel energy storage device is a peak-shaving frequency modulation device with millisecond response. When the electricity consumption is low, the flywheel energy storage device stores the electric energy generated by the power grid. And when the electricity consumption is in a peak, the flywheel energy storage device releases the stored electric energy so as to realize peak regulation and frequency modulation of the power grid. However, the flywheel energy storage device can only release electric energy for several minutes, and for the peak of electricity consumption which is several hours long, the flywheel energy storage device cannot meet the requirement of long-time peak regulation and frequency modulation of a power grid.
Disclosure of Invention
In view of the defects in the prior art, an embodiment of the present application aims to provide an energy storage device and a control method of the energy storage device, so as to solve the problem that the peak load and frequency modulation of a power grid cannot be performed for a long time.
In a first aspect, an embodiment of the present application provides an energy storage device, configured to be disposed between a power grid input end and a power grid output end, where the energy storage device includes an input switch, an output switch, and an energy storage structure;
the input end of the input switch is used for being connected with the input end of the power grid, the output end of the output switch is used for being connected with the output end of the power grid, and the output end of the input switch is connected with the input end of the output switch;
the energy storage structure comprises at least one flywheel energy storage part, at least one generator and at least one lifting device, wherein the flywheel energy storage part is connected to a node between the output end of the input switch and the input end of the output switch, the lifting device is connected to the node through the generator, the lifting device is connected with the generators in preset number, the generator is used for supplying power for lifting the energy storage part to the lifting device, and the lifting device is used for transferring the energy storage part to drive the generator to rotate to generate electric energy.
With reference to the first aspect, in a first possible implementation manner, the energy storage device further includes a transformer, at least one first bidirectional inverter, and at least one second bidirectional inverter;
each flywheel energy storage part is connected with the transformer through one first bidirectional inverter, and each generator is connected with the transformer through one second bidirectional inverter;
the first bidirectional inverter and the second bidirectional inverter are used for controlling current to flow in two directions.
With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner, the energy storage device further includes a circuit breaker;
the transformer is connected to the node through the circuit breaker.
With reference to the first aspect, in three possible implementations, the generator includes a rotor, and the lifting device includes a traction portion;
the traction part is connected with the rotor and is used for rotating the rotor to generate electric energy.
With reference to the first aspect, in four possible implementation manners, a bypass switch is further included;
the input end of the bypass switch is used for being connected with the input end of the power grid, and the output end of the bypass switch is used for being connected with the output end of the power grid.
With reference to the first aspect, in five possible implementation manners, the energy storage device further includes a protection circuit;
the output end of the input switch is connected to the node through the protection circuit, and the protection circuit is used for cutting off the connection between the power grid input end and the power grid output end when the power grid input end generates power disturbance.
With reference to the fifth possible implementation manner of the first aspect, in a sixth possible manner, the protection circuit includes a static switch and a reactance;
the output end of the input switch is connected to the node sequentially through the static switch and the reactance, the static switch is used for cutting off the connection between the power grid input end and the power grid output end, and the reactance is used for restraining short-circuit current.
In a second aspect, an embodiment of the present application provides a method for controlling an energy storage device, which is the energy storage device of the first aspect, the method including:
setting an operation mode of the flywheel energy storage part according to the power consumption and the generated energy of a power grid, wherein the operation mode comprises a charging mode, a discharging mode and a standby mode;
if the operation mode of the flywheel energy storage part is a discharging mode, and the stored electric energy of the flywheel energy storage part is reduced to a preset threshold value, the lifting equipment is controlled to transfer the energy storage part to drive the generator to rotate to generate electric energy.
With reference to the first aspect, in a possible implementation manner, after the controlling the lifting device to lower the energy storage device, the method further includes:
and if the voltage of the electric energy generated by the generator reaches a power supply voltage threshold value, setting the operation mode of the flywheel energy storage part as a charging mode or a standby mode.
With reference to the first aspect, in two possible implementation manners, the setting an operation mode of the flywheel energy storage portion according to the power consumption and the power generation amount of the power grid includes:
if the power consumption of the power grid is higher than the generated energy, setting the operation mode of the flywheel energy storage part as a discharging mode;
if the power consumption of the power grid is equal to the generated energy, setting the operation mode of the flywheel energy storage part as a standby mode;
and if the power consumption of the power grid is lower than the generated energy, setting the running mode of the flywheel energy storage part as a charging mode, and controlling the lifting equipment to lift the energy storage part.
The application provides an energy storage device, which is arranged between an input end and an output end of a power grid and comprises an input switch, an output switch and an energy storage structure; the input end of the input switch is used for being connected with the input end of the power grid, the output end of the output switch is used for being connected with the output end of the power grid, and the output end of the input switch is connected with the input end of the output switch; the energy storage structure comprises at least one flywheel energy storage part, at least one generator and at least one lifting device, wherein the flywheel energy storage part is connected to nodes between the output end of the input switch and the input end of the output switch, the lifting device is connected to the output nodes through the generator, the lifting devices are connected with the generators in preset number, the generator is used for supplying power for lifting the energy storage part to the lifting device, and the lifting device is used for transferring the energy storage part to drive the generator to rotate to generate electric energy. When the generated energy of the power grid is lower than the power consumption, the flying energy storage part makes millisecond-level discharge response and transitions to the lifting equipment to make several hours of discharge response, so that the balance of the active power of the power grid can be maintained in real time for a long time.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings required to be used in the embodiments will be briefly described below, and it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope of the present invention. Like components are numbered similarly in the various figures.
Fig. 1 is a schematic structural diagram illustrating an energy storage device provided in embodiment 1 of the present application;
fig. 2 is a schematic view showing another structure of an energy storage device provided in embodiment 1 of the present application;
fig. 3 shows a schematic structural diagram of a connection between a lifting device and a generator provided in embodiment 1 of the present application;
fig. 4 is a flowchart illustrating a method for controlling an energy storage device according to embodiment 2 of the present invention.
Description of the main element symbols:
100-energy storage device, 200-power grid input end, 300-power grid output end and 400-energy storage element; 110-energy storage structure, 120-protection circuit; 111-flywheel energy storage, 112-generator, 113-lifting equipment, 114-rotor, 115-traction; s1 input switch, S2 output switch, S3 bypass switch, HSS static switch, X reactance, QF breaker, T transformer, PCB1 first bidirectional inverter, PCB2 second bidirectional inverter.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Hereinafter, the terms "including", "having", and their derivatives, which may be used in various embodiments of the present invention, are only intended to indicate specific features, numbers, steps, operations, elements, components, or combinations of the foregoing, and should not be construed as first excluding the existence of, or adding to, one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing.
Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the present invention belong. The terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning that is consistent with their contextual meaning in the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein in various embodiments of the present invention.
Example 1
Referring to fig. 1, fig. 1 is a schematic structural diagram of an energy storage device provided in embodiment 1 of the present application. Exemplarily, the energy storage device 100 is configured to be disposed between the grid input 200 and the grid output 300, and the energy storage device 100 includes an input switch S1, an output switch S2, and an energy storage structure 110;
the input of the input switch S1 is for connection to the grid input 200, the output of the output switch S2 is for connection to the grid output 300, and the output of the input switch S1 is connected to the input of the output switch S2;
the energy storage structure 110 includes at least one flywheel energy storage portion 111, at least one generator 112 and at least one lifting device 113, each flywheel energy storage portion 111 is connected to a node between an output end of the input switch S1 and an input end of the output switch S2, each lifting device 113 is connected to the node through the generator 112, each lifting device 113 is connected to a preset number of generators 112, the generators 112 are used for supplying power for lifting the energy storage elements 400 to the lifting devices 113, and the lifting devices 113 are used for lowering the energy storage elements 400 to drive the generators 112 to rotate to generate electric energy.
The input switch S1 and the output switch S2 are protection switches. When the voltage higher than the voltage threshold is continuously input from the grid input 200, the input switch S1 and the output switch S2 are both turned off, so as to prevent the voltage higher than the voltage threshold from being input to the energy storage structure 110 or to the device connected to the grid output 300, which may cause device damage.
The flywheel energy storage unit 111 is a millisecond-level charging and discharging device, and includes a flywheel and an internal motor, which are not specifically shown in the figure. When the flywheel energy storage portion 111 is set to the charging mode, the electric energy drives the flywheel to rotate at a high speed, so that the electric energy is converted into mechanical energy to be stored. When the flywheel energy storage portion 111 is set to the discharging mode, the flywheel drives the built-in motor to rotate, so that the stored mechanical energy is converted into electric energy. If the power consumption of the power grid is higher than the generated energy, the flywheel energy storage part 111 is set to be in a discharging mode, and the generated electric energy is output to the power grid output end 300, so that the balance between the power consumption and the generated energy of the power grid is rapidly realized.
If the power consumption of the power grid is lower than the generated energy, the generator 112 drives the lifting device 113 to lift the energy storage member 400 to a position at a preset height from the ground, so as to convert the surplus electric energy into gravitational potential energy. If the power consumption of the power grid is higher than the generated energy, the lifting device 113 lowers the energy storage element 400 to the ground, and the generator 112 is driven to rotate to generate electric energy through the gravitational potential energy in the process that the energy storage element 400 is lowered to the ground. If the energy storage part 400 with sufficient quantity is lifted to a position with a preset height away from the ground in advance, the energy storage part 400 is placed downwards through the lifting equipment 113 to realize the balance between the power consumption and the generated energy of the power grid in the power consumption peak for several hours.
It should be understood that the number of the flywheel energy storage 111, the generator 112, and the lifting device 113 is set according to the power generation amount and the power consumption of the actual power grid, and is not limited herein. For the convenience of understanding of the present application, the number of the flywheel energy storage portion 111, the generator 112, and the lifting device 113 is 1 in the present embodiment. The lifting device 113 may be a crane, or any device capable of prompting or lowering the energy storage element. The energy storage element may be a recycled building material, a waste steel, or any element that can be lifted or lowered by the lifting device 113, which is not described herein. The preset number is set according to the gravitational potential energy of the lifting device 113 to lower the energy storage element 400, for example, if the gravitational potential energy of the lifting device 113 to lower the energy storage element 400 can drive 4 generators 112 to rotate to generate electric energy, each lifting device 113 is connected to 4 generators 112.
Referring to fig. 2, fig. 2 is a schematic view illustrating another structure of the energy storage device according to embodiment 1 of the present application. The energy storage device 100 further includes a transformer T, at least one first bi-directional inverter PCB1, and at least one second bi-directional inverter PCB 2;
each flywheel energy storage 111 is connected to the transformer T through one of the first bi-directional inverter PCBs 1, and each generator 112 is connected to the transformer T through one of the second bi-directional inverter PCBs 2;
the first bi-directional inverter PCB1 and the second bi-directional inverter PCB2 are both used to control the bi-directional flow of current.
The bidirectional inverter has no difference between an input end and an output end, and only has a direct current terminal and an alternating current terminal. The bidirectional inverter has a grid-connected function, and can output alternating current through the bidirectional inverter and also output direct current through the bidirectional inverter. The electric energy of the grid output end 300 can be input to the flywheel energy storage portion 111 and the generator 112 through the bidirectional inverter, and the electric energy of the generator 112 and the flywheel energy storage portion 111 can be output to the grid output end 300 through the bidirectional inverter.
The energy storage device 100 further comprises a circuit breaker QF; the transformer T is connected to the node through the breaker QF.
When the energy storage structure 110 neither needs to be charged nor discharged, the connection of the energy storage structure 110 with the grid output 300 and the grid input 200 is cut off by the breaker QF. Meanwhile, if the power grid input end 200 and the power grid output end 300 are short-circuited, the short-circuit current triggers the breaker QF to cut off the connection between the energy storage structure 110 and the power grid output end 300 and the power grid input end 200, so as to prevent the devices in the energy storage device 100 from being damaged.
Referring to fig. 3, fig. 3 is a schematic structural diagram illustrating a connection between a lifting device and a generator according to embodiment 1 of the present application. The generator 112 comprises a rotor 114, the hoisting device 113 comprises a traction portion 115; the traction portion 115 is connected to the rotor 114, and the traction portion 115 is used for rotating the rotor 114 to generate electric energy.
When the energy storage member 400 is lowered by the lifting device 113, the gravitational potential energy of the energy storage member 400 is converted into the kinetic potential energy of the traction portion 115, and the rotor 114 is rotated by the traction portion 115. The rotating rotor 114 performs a motion of cutting the magnetic induction lines, thereby generating electric energy that can be output to the grid output 300.
The energy storage device 100 further includes a protection circuit 120; the output terminal of the input switch S1 is connected to the node through the protection circuit 120, and the protection circuit 120 is configured to disconnect the grid input terminal 200 from the grid output terminal 300 when a power disturbance occurs at the grid input terminal 200.
When the grid input 200 fails, a power disturbance occurs at the grid input 200, that is, the input current or the input voltage at the grid input 200 fluctuates. The protection circuit 120 cuts off the connection between the grid input end 200 and the grid output end 300, and the flywheel energy storage portion 111 makes a millisecond-level discharge response, so as to avoid the power failure phenomenon of the grid output end 300 when the grid input end 200 fails.
The protection circuit 120 comprises a static switch HSS and a reactance X; the output end of the input switch S1 is connected to the node sequentially through the static switch HSS and the reactance X, the static switch HSS is configured to disconnect the power grid input end from the power grid output end, and the reactance X is configured to suppress a short-circuit current.
When a short circuit occurs between the grid input 200 and the grid output, power disturbance occurs at the grid input 200. When the static switch HSS is turned off and the breaker QF is turned on, the grid input 200 is disconnected from the grid output 300, and the energy storage structure 110 is connected to the grid output 300. The energy storage structure 110 generates electric energy and outputs the electric energy to the power grid output end 300, so that the electric energy which does not accord with the power supply standard and is output by the power grid output end 300 is avoided, and the electric equipment connected with the power grid output end 300 is prevented from being damaged.
It should be understood that the reactance X has a blocking effect on the current, and can suppress the short-circuit current from being input to the energy storage structure 110 and the electric equipment connected to the grid output terminal 300, so as to prevent the device in the energy storage structure 110 or the electric equipment from being damaged. In an alternating current circuit, both a capacitor and an inductor have a blocking effect on current. The reactance X may be a capacitor, or an inductor, and is not limited herein.
When the energy storage device 100 is overhauled, the input switch S1 and the output switch S2 are turned off, and the bypass switch S3 is turned on, so that the grid input end 200 and the grid output end 300 are kept in an on state, and the power failure of equipment connected with the grid output end 300 is avoided.
Example 2
Referring to fig. 4, fig. 4 is a flowchart illustrating a control method of an energy storage device according to embodiment 2 of the present invention. The energy storage device 100 is the energy storage device 100 in the embodiment, and the control method of the energy storage device comprises the following steps:
and S101, setting the operation mode of the flywheel energy storage part 111 according to the power consumption and the power generation amount of the power grid.
And acquiring the power consumption and the generating capacity of the power grid at the current moment, and determining whether the power consumption and the generating capacity of the power grid are balanced. If the power consumption and the power generation amount of the power grid are not balanced, the operation mode of the flywheel energy storage portion 111 is set, wherein the operation mode comprises a charging mode, a discharging mode and a standby mode. The balance between the power consumption and the generated energy of the power grid is realized by increasing the power consumption or the generated energy. The reliable operation of the power generation equipment and the power utilization equipment is ensured.
As an example, the setting of the operation mode of the flywheel energy storage portion 111 according to the power consumption and the power generation amount of the power grid includes:
if the power consumption of the power grid is higher than the generated energy, setting the operation mode of the flywheel energy storage part 111 as a discharging mode;
if the power consumption of the power grid is equal to the generated energy, setting the operation mode of the flywheel energy storage part 111 as a standby mode;
if the power consumption of the power grid is lower than the generated energy, the operation mode of the flywheel energy storage part 111 is set to be a charging mode, and the lifting equipment 113 is controlled to lift the energy storage part 400.
When the power consumption is low, the power consumption of the power grid is higher than the power generation amount, and the operation mode of the flywheel energy storage part 111 is set to be a discharging mode, so that the power generation amount of the power grid is increased. And when the power consumption peak is reached, the power consumption of the power grid is lower than the generated energy, the running mode of the flywheel energy storage part 111 is set to be a charging mode, the lifting equipment 113 is controlled to lift the energy storage part 400, and the power consumption of the power grid is increased. Meanwhile, the energy storage device 100 stores redundant electric energy, and releases the stored electric energy at the peak of power utilization, so as to balance the power consumption and the power generation amount of the power grid.
S102, if the operation mode of the flywheel energy storage portion 111 is a discharging mode and the stored electric energy of the flywheel energy storage portion 111 is reduced to a preset threshold, controlling the lifting device 113 to lower the energy storage element 400 to drive the generator 112 to rotate to generate electric energy.
There is a delay in the process of lowering the energy storage device 400 by the lifting device 113, and the electric energy generated by the generator 112 cannot be directly output to the grid output terminal 300 until the voltage of the electric energy generated by the generator 112 does not reach the supply voltage threshold. When the generated energy of the power grid is smaller than the power consumption, the energy storage element 400 is lowered by the lifting device 113 to drive the generator 112 to rotate, and the balance between the generated energy of the power grid and the power consumption cannot be realized immediately.
The flying energy storage part can make a discharge response in the millisecond level and can provide discharge for a period of several minutes. If the input end 200 of the power grid fails or the current moment is the peak moment of power utilization, the power consumption of the power grid is higher than the generated energy. The flying energy storage part supplies rapid power supply for several minutes, and then the flying energy storage part smoothly transits to the lifting equipment 113 to lower the energy storage part 400 to supply power for more than several hours, so that the power consumption of a power grid from 0 second to several hours is balanced with the generated energy, and the reliable operation of power generation equipment and power consumption equipment is ensured.
As an example, after the controlling the lifting device 113 to lower the energy storage device 400, the method further includes:
if the voltage of the electric energy generated by the generator 112 reaches the supply voltage threshold, the operation mode of the flywheel energy storage portion 111 is set to be a charging mode or a standby mode.
After the energy storage element 400 is lowered by the lifting device 113 to drive the generator 112 to rotate, if the voltage of the electric energy generated by the generator 112 reaches the supply voltage threshold, the flywheel energy storage portion 111 may stop generating electricity, and the operation mode of the flywheel energy storage portion 111 is set to a charging mode or a standby mode. If the voltage of the electric energy generated by the generator 112 does not reach the supply voltage threshold, the flywheel energy storage portion 111 and the generator 112 generate the electric energy at the same time. The reliable operation of the electric equipment is ensured, and the electric equipment is prevented from being incapable of reaching rated output.
The application provides a control method of an energy storage device, wherein an operation mode of a flywheel energy storage part is set according to the power consumption and the generated energy of a power grid; if the operation mode of the flywheel energy storage part is a discharging mode, and the stored electric energy of the flywheel energy storage part is reduced to a preset threshold value, the lifting equipment is controlled to transfer the energy storage part to drive the generator to rotate to generate electric energy. When the generated energy of the power grid is lower than the power consumption, the flying energy storage part makes millisecond-level discharge response and transitions to the lifting equipment to make several hours of discharge response, so that the balance of the active power of the power grid can be maintained in real time for a long time.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative and, for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, each functional module or unit in each embodiment of the present invention may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention or a part of the technical solution that contributes to the prior art in essence can be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a smart phone, a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention.
Claims (10)
1. An energy storage device is characterized by being arranged between an input end and an output end of a power grid and comprising an input switch, an output switch and an energy storage structure;
the input end of the input switch is used for being connected with the input end of the power grid, the output end of the output switch is used for being connected with the output end of the power grid, and the output end of the input switch is connected with the input end of the output switch;
the energy storage structure comprises at least one flywheel energy storage part, at least one generator and at least one lifting device, wherein the flywheel energy storage part is connected to a node between the output end of the input switch and the input end of the output switch, the lifting device is connected to the node through the generator, the lifting device is connected with the generators in preset number, the generator is used for supplying power for lifting the energy storage part to the lifting device, and the lifting device is used for transferring the energy storage part to drive the generator to rotate to generate electric energy.
2. The energy storage device of claim 1, further comprising a transformer, at least one first bidirectional inverter, and at least one second bidirectional inverter;
each flywheel energy storage part is connected with the transformer through one first bidirectional inverter, and each generator is connected with the transformer through one second bidirectional inverter;
the first bidirectional inverter and the second bidirectional inverter are used for controlling current to flow in two directions.
3. The energy storage device of claim 2, further comprising a circuit breaker;
the transformer is connected to the node through the circuit breaker.
4. The energy storage device of claim 1, wherein the generator comprises a rotor, the lifting apparatus comprises a traction portion;
the traction part is connected with the rotor and is used for rotating the rotor to generate electric energy.
5. The energy storage device of claim 1, further comprising a bypass switch;
the input end of the bypass switch is used for being connected with the input end of the power grid, and the output end of the bypass switch is used for being connected with the output end of the power grid.
6. The energy storage device of claim 1, further comprising a protection circuit;
the output end of the input switch is connected to the node through the protection circuit, and the protection circuit is used for cutting off the connection between the power grid input end and the power grid output end when the power grid input end generates power disturbance.
7. The energy storage device of claim 6, wherein said protection circuit comprises a static switch and a reactance;
the output end of the input switch is connected to the node sequentially through the static switch and the reactance, the static switch is used for cutting off the connection between the power grid input end and the power grid output end, and the reactance is used for restraining short-circuit current.
8. A method of controlling an energy storage device, wherein the energy storage device is an energy storage device according to any one of claims 1 to 7, the method comprising:
setting an operation mode of the flywheel energy storage part according to the power consumption and the generated energy of a power grid, wherein the operation mode comprises a charging mode, a discharging mode and a standby mode;
if the operation mode of the flywheel energy storage part is a discharging mode, and the stored electric energy of the flywheel energy storage part is reduced to a preset threshold value, the lifting equipment is controlled to transfer the energy storage part to drive the generator to rotate to generate electric energy.
9. The method of claim 8, wherein after controlling the lifting device to lower the energy storage member, the method further comprises:
and if the voltage of the electric energy generated by the generator reaches a power supply voltage threshold value, setting the operation mode of the flywheel energy storage part as a charging mode or a standby mode.
10. The method for controlling the energy storage device according to claim 8, wherein the setting of the operation mode of the flywheel energy storage portion according to the power consumption and the power generation amount of the power grid comprises:
if the power consumption of the power grid is higher than the generated energy, setting the operation mode of the flywheel energy storage part as a discharging mode;
if the power consumption of the power grid is equal to the generated energy, setting the operation mode of the flywheel energy storage part as a standby mode;
and if the power consumption of the power grid is lower than the generated energy, setting the running mode of the flywheel energy storage part as a charging mode, and controlling the lifting equipment to lift the energy storage part.
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