Energy charging control method of flywheel energy storage module, controller, device and medium

Abstract

The embodiment of the invention provides an energy charging control method of a flywheel energy storage module, a controller, a device and a medium, and relates to the technical field of electric power, and the method comprises the steps that the controller controls a path between a hydroelectric generating set and a power grid to be disconnected in response to a shutdown instruction of the hydroelectric generating set; and a path between the hydroelectric generating set and the flywheel energy storage module is controlled to be conducted, so that the hydroelectric generating set charges the flywheel energy storage module. Therefore, in the shutdown process of the hydroelectric generating set, the controller can control the hydroelectric generating set which can still generate kinetic energy due to idling of the water turbine to charge the flywheel energy storage module, and therefore the kinetic energy consumed by the hydroelectric generating set is reduced.

Description

Technical Field

[0001] This application belongs to the field of power technology, specifically relating to a charging control method, controller, device, and medium for a flywheel energy storage module. Background Technology

[0002] A hydroelectric generator is a hydropower unit that uses the kinetic energy of water flow to drive a turbine, which in turn drives a generator to produce electricity to supply power to the grid. In a power system, the electrical output of the hydroelectric generator is specifically adjusted through Automatic Generation Control (AGC).

[0003] In related technologies, when shutting down a hydroelectric generator, the controller closes the inlet valve to block the water flow towards the turbine and disconnects the generator from the power grid. However, the turbine runner continues to rotate in the air due to inertia. Since the generator is not connected to the grid, it cannot effectively convert the kinetic energy generated by the turbine's idling into electrical energy to supply power to the grid. Furthermore, the kinetic energy is entirely dissipated as heat through air resistance and bearing friction, resulting in a high kinetic energy loss for the hydroelectric generator. Summary of the Invention

[0004] This application provides a charging control method, controller, device, and medium for a flywheel energy storage module to solve the problem of high kinetic energy loss in hydropower units in related technologies.

[0005] The first aspect of this application provides a charging control method for a flywheel energy storage module, applied to a controller in a power supply system. The power supply system further includes a hydroelectric generator and a flywheel energy storage module, the hydroelectric generator including a turbine and a generator; the method includes: In response to a shutdown command for the hydropower unit, the connection between the hydropower unit and the power grid is disconnected. Control the connection between the hydropower unit and the flywheel energy storage module so that the hydropower unit can charge the flywheel energy storage module.

[0006] Optionally, the flywheel energy storage module includes multiple flywheel energy storage devices; controlling the connection between the turbine and the flywheel energy storage module to enable the turbine to charge the flywheel energy storage module includes: Control the connection between the hydropower unit and the first flywheel energy storage device among multiple flywheel energy storage devices, so that the hydropower unit can charge the first flywheel energy storage device. The energy stored in the first flywheel energy storage device is less than the first preset energy.

[0007] Optionally, the power supply system further includes: an automatic transfer switch, a first switch, a second switch, and a first busbar. One end of the first switch is connected to the hydropower unit, one end of the second switch is connected to the first flywheel energy storage device, and the other ends of both the first and second switches are connected to the first busbar. Controlling the connection between the hydropower unit and the first flywheel energy storage device among multiple flywheel energy storage devices includes: The first and second switches are closed by controlling the automatic transfer switch.

[0008] Optionally, the method also includes: When the hydropower unit is in operation, the system controls the hydropower unit to supply power to the grid, and adjusts the charging and discharging state of the flywheel energy storage module based on the frequency changes of the grid in order to adjust the grid frequency.

[0009] Optionally, based on the frequency variation of the power grid, the charging and discharging states of the flywheel energy storage module are adjusted to adjust the power grid frequency, including: When the frequency of the power grid is lower than the first preset frequency, the flywheel energy storage module is controlled to discharge to the power grid; When the frequency of the power grid is greater than the second preset frequency, the hydropower unit is controlled to charge the flywheel energy storage module.

[0010] Optionally, the flywheel energy storage module includes multiple flywheel energy storage devices; controlling the flywheel energy storage module to discharge to the grid includes: Control the second flywheel energy storage device in a plurality of flywheel energy storage devices to discharge to the grid; The energy stored in the second flywheel energy storage device is greater than the second preset energy.

[0011] Optionally, the power supply system also includes a second busbar and a third switch, the third switch being connected between the second flywheel energy storage device and one end of the second busbar, the other end of the second busbar being used to connect to the power grid; controlling the second flywheel energy storage device among multiple flywheel energy storage devices to discharge to the power grid includes: Control the third switch to close.

[0012] Optionally, the power supply system also includes a third busbar, a bus tie switch, and a fourth switch. One end of the third busbar is connected to one end of the second busbar via the bus tie switch. One end of the third busbar is also connected to the hydropower unit. The other end of the third busbar is used to connect to the power grid, and the other end of the second busbar is used to connect to the power grid via the fourth switch. Controlling the hydropower unit to charge the flywheel energy storage module includes: Control the bus tie switch to close and control the fourth switch to open.

[0013] The second aspect of this application provides a controller, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements a charging control method for a flywheel energy storage module as described in any of the first aspects.

[0014] This application provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements a charging control method for a flywheel energy storage module as described in any of the first aspects.

[0015] A fourth aspect of this application provides a charging control device for a flywheel energy storage module, applied to a power supply system. The power supply system includes a hydroelectric generator and a flywheel energy storage module, the hydroelectric generator including a turbine and a generator; the device includes: The first control module is used to disconnect the connection between the turbine and the generator in response to a shutdown command for the hydropower unit. The second control module is used to control the connection between the turbine and the flywheel energy storage module, so that the turbine can charge the flywheel energy storage module.

[0016] Optionally, the flywheel energy storage module includes multiple flywheel energy storage devices; the second control module is used for: Control the connection between the hydropower unit and the first flywheel energy storage device among multiple flywheel energy storage devices, so that the hydropower unit can charge the first flywheel energy storage device. The energy stored in the first flywheel energy storage device is less than the first preset energy.

[0017] Optionally, the power supply system also includes: an automatic transfer switch, a first switch, a second switch, and a first busbar; one end of the first switch is connected to the hydroelectric generator, one end of the second switch is connected to the first flywheel energy storage device, and the other ends of both the first and second switches are connected to the first busbar; the second control module is used for: The first and second switches are closed by controlling the automatic transfer switch.

[0018] Optionally, the device may also include: a third control module, used for: When the hydropower unit is in operation, the system controls the hydropower unit to supply power to the grid, and adjusts the charging and discharging state of the flywheel energy storage module based on the frequency changes of the grid in order to adjust the grid frequency.

[0019] Optionally, the third control module is used for: When the frequency of the power grid is lower than the first preset frequency, the flywheel energy storage module is controlled to discharge to the power grid; When the frequency of the power grid is greater than the second preset frequency, the hydropower unit is controlled to charge the flywheel energy storage module.

[0020] Optionally, the flywheel energy storage module includes multiple flywheel energy storage devices; controlling the flywheel energy storage module to discharge to the grid includes: Control the second flywheel energy storage device in a plurality of flywheel energy storage devices to discharge to the grid; The energy stored in the second flywheel energy storage device is greater than the second preset energy.

[0021] Optionally, the power supply system also includes a second busbar and a third switch. The third switch is connected between the second flywheel energy storage device and one end of the second busbar, and the other end of the second busbar is used to connect to the power grid. The third control module is used for: Control the third switch to close.

[0022] Optionally, the power supply system also includes a third busbar, a bus tie switch, and a fourth switch. One end of the third busbar is connected to one end of the second busbar via the bus tie switch. One end of the third busbar is also connected to the hydropower unit. The other end of the third busbar is used to connect to the power grid, and the other end of the second busbar is used to connect to the power grid via the fourth switch. The third control module is used for: Control the bus tie switch to close and control the fourth switch to open.

[0023] The fifth aspect of this application provides a power supply system, which includes a hydroelectric generator, a flywheel energy storage module, and a controller as described in the second aspect or a charging control device for the flywheel energy storage module as described in the fourth aspect; the hydroelectric generator includes a turbine and a generator.

[0024] The sixth aspect of this application provides a computer program product, including a computer program that, when executed by a processor, implements a charging control method for any flywheel energy storage module as described in the first aspect.

[0025] The present application provides a method, controller, device, and medium for charging a flywheel energy storage module. The method includes: the controller, in response to a shutdown command for a hydropower unit, disconnecting the connection between the hydropower unit and the power grid; and controlling the connection between the hydropower unit and the flywheel energy storage module to allow the hydropower unit to charge the flywheel energy storage module. Thus, during the shutdown process of the hydropower unit, the controller can control the hydropower unit, which still generates kinetic energy due to idling, to charge the flywheel energy storage module, thereby reducing the kinetic energy loss of the hydropower unit. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of a power supply system provided in an embodiment of this application; Figure 2 A flowchart illustrating a charging control method for a flywheel energy storage module provided in an embodiment of this application; Figure 3 This is a schematic diagram of another power supply system provided in an embodiment of this application; Figure 4 A flowchart illustrating another charging control method for a flywheel energy storage module provided in this application embodiment; Figure 5 This is a schematic diagram of the structure of a controller provided in an embodiment of this application; Figure 6 A block diagram of a charging control device for a flywheel energy storage module provided in an embodiment of this application; Figure 7 A block diagram of a charging control device for another flywheel energy storage module provided in an embodiment of this application. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0028] The terms "first," "second," etc., used in this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of the same class, without limiting the number of objects; for example, the first object can be one or more. Furthermore, "or" in this application indicates at least one of the connected objects. For example, "A or B" covers three scenarios: Scenario 1: including A but not B; Scenario 2: including B but not A; Scenario 3: including both A and B. The character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0029] The term "instruction" in this application can be either a direct instruction (or explicit instruction) or an indirect instruction (or implicit instruction). A direct instruction can be understood as one in which the sender explicitly informs the receiver of specific information, the operation to be performed, or the requested result, etc.; an indirect instruction can be understood as one in which the receiver determines the corresponding information based on the instruction sent by the sender, or makes a judgment and determines the operation to be performed or the requested result, etc., based on the judgment result.

[0030] Hydropower units efficiently utilize water resources, meeting electricity demands under diverse geographical conditions. Especially in areas with large head differences but relatively small flow rates, turbines can efficiently convert the energy of water flow into electrical energy. Based on flow conditions, hydropower units include impulse turbines and reaction turbines. Impulse turbines are suitable for high head and low flow conditions, while reaction turbines are suitable for low head and high flow conditions.

[0031] In related technologies, during the shutdown of a hydropower unit, the inlet valve is closed to block the water flow, causing the turbine runner to spin idly in the air. The controller converts all the mechanical energy into heat energy dissipation through air resistance and bearing friction, resulting in a high loss of kinetic energy in the hydropower unit.

[0032] Furthermore, due to the large mass of the hydroelectric generator unit, the turbine runner has a large moment of inertia. Moreover, the rotational damping of the runner in the air is much smaller than that in the water. As a result, the speed of the runner decreases very slowly, leading to a longer downtime for the hydroelectric generator unit and thus resulting in low operational flexibility.

[0033] This application provides a charging control method for a flywheel energy storage module. In this method, during the shutdown of a hydropower unit, the controller can control the electrical energy generated by the turbine-driven generator in the hydropower unit to charge the flywheel energy storage module, thereby reducing the kinetic energy loss of the hydropower unit.

[0034] Furthermore, the kinetic energy generated by the hydropower unit can be converted into electrical energy, causing the flywheel energy storage module to generate a reverse electromagnetic torque to brake the turbine's runner, reducing the hydropower unit's downtime and thus improving the operational flexibility of the hydropower unit.

[0035] In this application embodiment, a controller is also provided. For the charging control of the flywheel energy storage module, the controller can perform local control on-site or transmit signals to a host computer to realize host computer control.

[0036] The technical solution of the charging control method for the flywheel energy storage module of this application is described below using several specific embodiments as examples: Figure 1 This is a schematic diagram of a power supply system provided in an embodiment of this application, such as... Figure 1As shown, the system includes: a hydro-generator unit 11, a flywheel energy storage module 12, an automatic start / stop device 13, a first switch 14, a second switch 15, and a first busbar 16; the hydro-generator unit 11 includes: a turbine 111 and a generator 112; the flywheel energy storage module 12 includes multiple flywheel energy storage devices, wherein the energy stored in the first flywheel energy storage device 121 is less than a first preset energy; one end of the first switch 14 is connected to the hydro-generator unit 11, one end of the second switch 15 is connected to the first flywheel energy storage device 121, and the other ends of the first switch 14 and the second switch 15 are both connected to the first busbar 16.

[0037] The connection between the components in the power supply system is an electrical connection, and the connection between the power supply system and the power grid 200 is also an electrical connection.

[0038] Figure 2 This application provides a flowchart illustrating a charging control method for a flywheel energy storage module, which can be applied to... Figure 1 The controller in the power supply system shown, such as Figure 2 As shown, the flow of the method in this embodiment is as follows: Step 201: In response to the shutdown command of the hydropower unit, control the disconnection of the connection between the hydropower unit and the power grid.

[0039] Among them, such as Figure 1 As shown, there is a connection between the hydro-generator unit 11 and the power grid 200 in the power supply system. When the hydro-generator unit 11 is running, the water flow drives the turbine runner of the turbine 111 to rotate at high speed, generating kinetic energy. The controller can control the generator 112 to convert the kinetic energy into electrical energy and send it to the power grid 200. When the hydro-generator unit 11 receives a shutdown command, the controller can respond to the shutdown command by disconnecting the connection between the hydro-generator unit 11 and the power grid 200 to stop the hydro-generator unit 11 from supplying power to the power grid 200. At this time, the turbine runner of the turbine 111 will enter the air and rotate idling due to inertia.

[0040] Optionally, in some embodiments, the hydropower unit and the power grid can be connected via a load switch, which can connect and disconnect the load current of the hydropower unit under normal operating conditions. When the controller receives a shutdown command, the controller can control the load switch to disconnect, thereby breaking the connection between the hydropower unit and the power grid.

[0041] In other embodiments, the hydropower unit and the power grid can be connected via a circuit breaker. The circuit breaker can not only connect and disconnect the load current of the hydropower unit under normal operating conditions, but also disconnect the short-circuit current in the event of a short circuit. When the controller receives a shutdown command, it can control the circuit breaker to open, thereby disconnecting the connection between the hydropower unit and the power grid.

[0042] Optionally, a disconnecting switch, also called a knife switch, is connected between the hydropower unit and the power grid. It cannot be operated under load. When the hydropower unit needs maintenance, after the connection between the hydropower unit and the power grid is broken, the maintenance personnel can disconnect the disconnecting switch to ensure that the hydropower unit is physically isolated from other live components, thereby improving safety.

[0043] Step 202: Control the connection between the hydropower unit and the flywheel energy storage module so that the hydropower unit can charge the flywheel energy storage module.

[0044] Among them, such as Figure 1 As shown, there is a connection path between the hydropower unit 11 and the flywheel energy storage module 12. After the controller disconnects the path between the hydropower unit 11 and the power grid 200, it can control the path between the hydropower unit 11 and the flywheel energy storage module 12 to be turned on so that the kinetic energy generated by the hydropower unit 11 can charge the flywheel energy storage module 12.

[0045] Optionally, the controller can control the connection between the hydropower unit and the first flywheel energy storage device among multiple flywheel energy storage devices, so as to enable the hydropower unit to charge the target flywheel energy storage device; wherein the energy stored in the first flywheel energy storage device is less than a first preset energy.

[0046] The structure of the flywheel energy storage device includes, but is not limited to, components such as a housing, flywheel, bidirectional motor, and magnetic levitation bearing. The interior of the housing is a vacuum environment, which can avoid air resistance from hindering the flywheel. The flywheel can be a solid disc. The bidirectional motor can drive the flywheel to accelerate its rotation to store mechanical energy, or it can act as a generator to generate electricity by reducing the speed of the flywheel. The flywheel and the bidirectional motor are supported by magnetic levitation bearings, which can avoid mechanical friction loss from direct contact.

[0047] like Figure 1 As shown, there is a connection between the hydro-generator unit 11 and the first flywheel energy storage device 121. After the controller disconnects the connection between the hydro-generator unit 11 and the power grid 200, it can control the connection between the hydro-generator unit 11 and the first flywheel energy storage device 121 to be opened, so that the hydro-generator unit 11 can charge the first flywheel energy storage device 121. Specifically, the kinetic energy generated by the idle rotation of the turbine 111 can drive the generator 112 to generate electrical energy. This electrical energy can drive the bidirectional motor in the first flywheel energy storage device 121 to work, so that the flywheel rotates, thereby converting the electrical energy generated by the generator 112 into mechanical energy and storing it in the high-speed rotating flywheel in the first flywheel energy storage device.

[0048] The flywheel energy storage device stores mechanical energy by driving a flywheel to accelerate its rotation using a bidirectional motor. The mechanical energy generated by the flywheel can be calculated from its moment of inertia and rotational speed. The moment of inertia, which describes the flywheel's ability to resist rotational speed, can be obtained from its mass and radius. The rotational speed can be detected by a wheel speed sensor. Therefore, the energy stored in the flywheel energy storage device can be determined based on the current rotational speed of the flywheel. Thus, a first preset energy can be determined by a first preset rotational speed. If the flywheel does not reach the first preset rotational speed, it can be determined that the energy stored in the flywheel energy storage device is less than the first preset energy. This confirms that the flywheel energy storage device is the first flywheel energy storage device, and it can then continue to be charged.

[0049] Optionally, the controller can control the closing of the first and second switches through the automatic switching device to make the passage between the hydropower unit and the first flywheel energy storage device among multiple flywheel energy storage devices open.

[0050] like Figure 1 As shown, after the controller disconnects the connection between the hydropower unit 11 and the power grid 200, it can control the automatic transfer switch 13 to close the first switch 14 and the second switch 15. Since one end of the first switch 14 is connected to the hydropower unit 11, one end of the second switch 15 is connected to the first flywheel energy storage device 121, and the other ends of both the first switch 14 and the second switch 15 are connected to the first busbar 16, the hydropower unit 11 and the first flywheel energy storage device 121 can be connected through the first busbar 16.

[0051] Optionally, the first switch and the second switch can be circuit breakers. The first switch can also be connected to a first disconnecting switch, and the second switch can also be connected to a second disconnecting switch.

[0052] Since the controller can control the closing of the first and second switches through the automatic transfer switch, the automatic switching of the switches can be achieved without manual intervention, which improves the response speed and the reliability of the power supply system.

[0053] Furthermore, the electrical energy generated by the generator can drive the bidirectional motor in the flywheel energy storage module to generate electromagnetic torque, thereby driving the flywheel to rotate. At the same time, it also generates reverse electromagnetic torque to brake the turbine's runner, thus reducing the downtime of the hydroelectric generator unit.

[0054] In summary, this application provides a charging control method for a flywheel energy storage module. In this method, the controller, in response to a shutdown command of the hydropower unit, disconnects the connection between the hydropower unit and the power grid; and simultaneously connects the connection between the hydropower unit and the flywheel energy storage module, enabling the hydropower unit to charge the flywheel energy storage module. Thus, during the shutdown process of the hydropower unit, the controller can control the hydropower unit, which still generates kinetic energy due to idling, to charge the flywheel energy storage module, thereby reducing the kinetic energy loss of the hydropower unit.

[0055] Figure 3 A schematic diagram of another power supply system provided in an embodiment of this application is shown below. Figure 3 As shown, in Figure 1 Based on the power supply system shown, it also includes: a second busbar 31, a third switch 32, a third busbar 33, a bus tie switch 34, and a fourth switch 35; the flywheel energy storage module 12 also includes a second flywheel energy storage device 122, wherein the energy stored by the second flywheel energy storage device 122 is greater than the second preset energy; the third switch 32 is connected between the second flywheel energy storage device 122 and one end of the second busbar 31, one end of the third busbar 33 is connected to one end of the second busbar 31 through the bus tie switch 34, one end of the third busbar 33 is also connected to the hydropower unit 11, the other end of the third busbar 33 is used to connect to the power grid 200, and the other end of the second busbar 31 is used to connect to the power grid 200 through the fourth switch 35.

[0056] The connection between the components in the power supply system is an electrical connection, and the connection between the power supply system and the power grid 200 is also an electrical connection.

[0057] Optionally, when the hydropower unit is in operation, the hydropower unit is controlled to supply power to the grid, and the charging and discharging state of the flywheel energy storage module is adjusted based on the frequency change of the grid in order to adjust the grid frequency.

[0058] Among them, such as Figure 3 As shown, when the hydropower unit is in operation, the controller can control the connection between the hydropower unit 11 and the power grid 200 so that the hydropower unit 11 can supply power to the power grid 200.

[0059] Furthermore, the stability of the power grid frequency directly affects the safe operation of hydropower units and electrical equipment. It represents the number of periodic changes in alternating current per second, measured in Hertz (Hz). The voltage signal of the power grid can be collected in real time using a frequency detection device, and the deviation of the current alternating current frequency from its rated value can be calculated to determine the frequency change status of the power grid. If the power grid frequency increases, the state of the flywheel energy storage module can be adjusted to charging mode to reduce the power grid frequency; if the power grid frequency decreases, the state of the flywheel energy storage module can be adjusted to discharging mode to increase the power grid frequency. Here, the charging state of the flywheel energy storage module refers to the hydropower unit charging the flywheel energy storage module, and the discharging state refers to the flywheel energy storage module discharging into the power grid.

[0060] Optionally, the hydropower unit can also be connected to the third busbar via a fifth switch. The fifth switch can be a circuit breaker or a fifth disconnecting switch.

[0061] The following describes, with specific examples, possible implementations of adjusting the charging and discharging states of the flywheel energy storage module to adjust the grid frequency based on grid frequency changes.

[0062] Figure 4 This is a flowchart illustrating another charging control method for a flywheel energy storage module provided in an embodiment of this application. This method can be applied to... Figure 3 The controller in the power supply system shown, such as Figure 4 As shown, the flow of the method in this embodiment is as follows: Step 401: When the frequency of the power grid is less than the first preset frequency, control the flywheel energy storage module to discharge to the power grid.

[0063] The first preset frequency is a critical value less than or equal to the standard frequency used to maintain the safe and stable operation of the power grid. When the frequency of the power grid is less than the preset frequency, it indicates that the power generation capacity of the hydropower unit is insufficient or the load has suddenly increased, requiring increased output, i.e., increased electrical energy supplied to the power grid. Therefore, the controller can control the flywheel energy storage module to discharge to the power grid. Specifically, the controller can control the mechanical energy of the flywheel rotation in the flywheel energy storage module to be converted into electrical energy and discharged to the power grid.

[0064] For example, assuming the standard operating frequency of the power grid connected to the hydropower unit is 50Hz, and the first preset frequency is set to 49.95Hz, then when the frequency of the power grid is less than 49.95Hz, the controller will control the flywheel energy storage module to discharge to the power grid.

[0065] Optionally, the second flywheel energy storage device among multiple flywheel energy storage devices is controlled to discharge to the grid; wherein the energy stored in the second flywheel energy storage device is greater than a second preset energy.

[0066] like Figure 3As shown, the second flywheel energy storage device 122 has a connection path between the second busbar 31. When the frequency of the power grid 200 is less than the first preset frequency, the controller can control the connection between the second flywheel energy storage device 122 and the power grid 200 to be open, and control the second flywheel energy storage device 122 to discharge to the power grid 200. Specifically, the flywheel in the second flywheel energy storage device 122 can be controlled to reduce its speed, and the mechanical energy released when the flywheel decelerates can be converted into electrical energy through a bidirectional motor and discharged to the power grid 200.

[0067] The second preset energy can be determined by the second preset rotation speed. If the rotation speed of the flywheel is greater than the second preset rotation speed, it can be determined that the energy stored in the flywheel energy storage device is greater than the second preset energy. Thus, the flywheel energy storage device can be identified as the second flywheel energy storage device. In turn, the connection between the second flywheel energy storage device and the power grid can be controlled so that the second flywheel energy storage device can discharge to the power grid.

[0068] Optionally, the controller can control the closing of the third switch to establish a connection between the second flywheel energy storage device and the power grid.

[0069] like Figure 3 As shown, the second flywheel energy storage device 122 is connected to the second bus 31 via the third switch 32. When the frequency of the power grid 200 is less than the first preset frequency, the controller can control the third switch 32 to close, so that the path between the second flywheel energy storage device 122 and the second bus 31 is open. Since the second bus 31 is connected to the power grid 200, the path between the second flywheel energy storage device 122 and the power grid 200 is open.

[0070] In some embodiments, the third switch may be a circuit breaker, and the third switch may also be connected to a third disconnecting switch.

[0071] Step 402: When the frequency of the power grid is greater than the second preset frequency, control the hydropower unit to charge the flywheel energy storage module.

[0072] The second preset frequency is a critical value greater than or equal to the standard frequency used to maintain the safe and stable operation of the power grid. When the frequency of the power grid is greater than the second preset frequency, it indicates that the line may trip or the load may suddenly decrease, requiring a reduction in output, that is, a reduction in the electrical energy supplied to the power grid. Therefore, the controller can control the hydropower unit to charge the flywheel energy storage module, so as to convert a portion of the electrical energy into mechanical energy and store it in the flywheel energy storage module.

[0073] For example, assuming the standard operating frequency of the power grid connected to the hydropower unit is 50Hz and the second preset frequency is set to 50.05Hz, then when the frequency of the power grid is greater than 50.05Hz, the controller will control the hydropower unit to charge the flywheel energy storage module.

[0074] Optionally, the controller can control the bus tie switch to close and the fourth switch to open, so as to make the path between the second bus and the third bus open and the path between the second bus and the power grid closed.

[0075] like Figure 3 As shown, the second busbar 31 is connected to the third busbar 33 via a bus tie switch 34, and the second busbar 31 is connected to the power grid 200 via a fourth switch 35. When the frequency of the power grid 200 is greater than the second preset frequency, the controller can control the bus tie switch 34 to close, thereby opening the path between the second and third buses. Since one end of the third busbar 33 is also connected to the hydropower unit 11, the hydropower unit 11 can charge the flywheel energy storage module 12 through the third busbar 33 and the second busbar 31. To reduce the power supplied to the power grid 200, the fourth switch 35 must be disconnected to prevent the hydropower unit 11 from discharging to the power grid 200 through the second busbar 31.

[0076] In some embodiments, the fourth switch may be a circuit breaker, and the fourth switch may also be connected to a fourth disconnecting switch.

[0077] Optionally, the first flywheel energy storage device can also be connected to the second bus. Since the energy stored in the first flywheel energy storage device is less than the first preset energy, the hydropower unit can charge the first flywheel energy storage device through the third bus and the second bus, so that the first flywheel energy storage device can convert electrical energy into mechanical energy for storage.

[0078] In related technologies, when the frequency of the power grid changes, the power supply system adjusts the frequency by increasing the water intake of the turbine. However, under high water head conditions, the hydropower unit has a low gradeability due to the large inertial time of the water flow and the significant water hammer effect, which in turn results in a low ability of the hydropower unit to respond to the frequency regulation requirements of the power grid.

[0079] In this embodiment, the flywheel energy storage module has advantages such as fast response speed, high ramp rate and bidirectional regulation. The flywheel energy storage module can be used as a frequency regulation resource to assist in adjusting the frequency of the power grid, thereby improving the response capability of the hydropower unit to changes in the power grid frequency and thus improving the operational flexibility of the hydropower unit. While improving the economic benefits of the power station, it also improves the safety and stability level of the power grid.

[0080] In the above embodiments, optionally, the power supply system may include multiple hydropower units, and each hydropower unit and the flywheel energy storage module have a connection path.

[0081] Optionally, a step-up transformer is also connected between the second busbar, the third busbar, and the power grid. When the hydropower unit is operating, the step-up transformer is used to step up the voltage of the electrical energy generated by the hydropower unit before sending it to the power grid.

[0082] Optionally, current transformers and voltage transformers can be installed on the second bus side to achieve millisecond-level power, frequency, and phase detection of the power grid and the flywheel energy storage module output side; and an automatic synchronizing device can be installed on the second bus side to track the grid voltage, frequency, and phase angle in real time, thereby realizing the grid connection between the flywheel energy storage module and the grid so that the flywheel energy storage module can supply power to the grid.

[0083] Figure 5 A schematic diagram of the structure of a controller provided in an embodiment of this application is shown below. Figure 5 As shown, the controller 50 includes a memory 501, a processor 502, and a computer program stored in the memory 501 and executable on the processor 502. When the processor 502 executes the computer program, it implements the control method of the atmospheric wall-hung boiler described in the above embodiment.

[0084] The processor 502 may be a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof.

[0085] This application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the charging control method for any of the flywheel energy storage modules described above.

[0086] Figure 6 A block diagram of a charging control device for a flywheel energy storage module provided in this application embodiment is shown. This device is applied to a power supply system, which includes a hydroelectric generator and a flywheel energy storage module. The hydroelectric generator includes a turbine and a generator. Figure 6 As shown, the device includes: a first control module 601 and a second control module 602, wherein, The first control module 601 is used to control the disconnection of the connection between the turbine and the generator in response to the shutdown command of the hydropower unit; The second control module 602 is used to control the connection between the water turbine and the flywheel energy storage module so that the water turbine can charge the flywheel energy storage module.

[0087] Optionally, the flywheel energy storage module includes multiple flywheel energy storage devices; the second control module 602 is used for: Control the connection between the hydropower unit and the first flywheel energy storage device among multiple flywheel energy storage devices, so that the hydropower unit can charge the first flywheel energy storage device. The energy stored in the first flywheel energy storage device is less than the first preset energy.

[0088] Optionally, the power supply system also includes: an automatic transfer switch, a first switch, a second switch, and a first busbar; one end of the first switch is connected to the hydroelectric generator, one end of the second switch is connected to the first flywheel energy storage device, and the other ends of both the first and second switches are connected to the first busbar; the second control module 602 is used for: The first and second switches are closed by controlling the automatic transfer switch.

[0089] The apparatus in this embodiment can be used to perform the above-described... Figure 2 The steps of the method embodiment shown are similar in principle and technical effect, and will not be repeated here.

[0090] Figure 7 A block diagram of another charging control device for a flywheel energy storage module provided in this application embodiment, applied to a power supply system, such as... Figure 7 As shown, the device also includes: a third control module 603, used for: When the hydropower unit is in operation, the system controls the hydropower unit to supply power to the grid, and adjusts the charging and discharging state of the flywheel energy storage module based on the frequency changes of the grid in order to adjust the grid frequency.

[0091] Optionally, the third control module 603 is used for: When the frequency of the power grid is lower than the first preset frequency, the flywheel energy storage module is controlled to discharge to the power grid; When the frequency of the power grid is greater than the second preset frequency, the hydropower unit is controlled to charge the flywheel energy storage module.

[0092] Optionally, the flywheel energy storage module includes multiple flywheel energy storage devices; controlling the flywheel energy storage module to discharge to the grid includes: Control the second flywheel energy storage device in a plurality of flywheel energy storage devices to discharge to the grid; The energy stored in the second flywheel energy storage device is greater than the second preset energy.

[0093] Optionally, the power supply system also includes a second busbar and a third switch. The third switch is connected between the second flywheel energy storage device and one end of the second busbar, and the other end of the second busbar is used to connect to the power grid. The third control module 603 is used for: Control the third switch to close.

[0094] Optionally, the power supply system also includes a third busbar, a bus tie switch, and a fourth switch. One end of the third busbar is connected to one end of the second busbar via the bus tie switch. One end of the third busbar is also connected to the hydropower unit. The other end of the third busbar is used to connect to the power grid, and the other end of the second busbar is used to connect to the power grid via the fourth switch. The third control module 603 is used for: Control the bus tie switch to close and control the fourth switch to open.

[0095] The apparatus in this embodiment can be used to perform the above-described... Figure 2 and Figure 4 The steps of the method embodiment shown are similar in principle and technical effect, and will not be repeated here.

[0096] This application embodiment also provides a power supply system, which includes a hydroelectric generator, a flywheel energy storage module, and a controller as described above or a charging control device for the flywheel energy storage module as described above; the hydroelectric generator includes a turbine and a generator.

[0097] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the charging control method for any of the above flywheel energy storage modules.

[0098] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0099] From the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of computer software products plus necessary general-purpose hardware platforms, and of course, they can also be implemented by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disk, optical disk, etc.) and includes several instructions to cause the terminal or network-side device to execute the methods described in the various embodiments of this application.

[0100] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other implementations under the guidance of this application without departing from the spirit and scope of the claims. All of these implementations are within the protection scope of this application.

Claims

1. A charging control method for a flywheel energy storage module, characterized in that, The application discloses a controller applied to a power supply system, and the power supply system further comprises a hydroelectric generating set and a flywheel energy storage module, the hydroelectric generating set comprises a water turbine and a generator, and the method comprises the following steps: In response to a shutdown instruction of the hydroelectric generating set, a path between the hydroelectric generating set and a power grid is controlled to be disconnected; A path between the hydroelectric generating set and the flywheel energy storage module is controlled to be connected, so that the hydroelectric generating set charges the flywheel energy storage module.

2. The method of claim 1, wherein, The flywheel energy storage module comprises a plurality of flywheel energy storage devices; the path between the hydroelectric generating set and the flywheel energy storage module is controlled to be connected, so that the hydroelectric generating set charges the flywheel energy storage module, and the method comprises the following steps: A path between the hydroelectric generating set and a first flywheel energy storage device in the plurality of flywheel energy storage devices is controlled to be connected, so that the hydroelectric generating set charges the first flywheel energy storage device; The first flywheel energy storage device stores energy less than a first preset energy.

3. The method of claim 2, wherein, The power supply system further comprises a backup automatic switching device, a first switch, a second switch and a first bus, one end of the first switch is connected with the hydroelectric generating set, one end of the second switch is connected with the first flywheel energy storage device, and the other end of the first switch and the other end of the second switch are both connected with the first bus; the path between the hydroelectric generating set and the first flywheel energy storage device in the plurality of flywheel energy storage devices is controlled to be connected, and the method comprises the following steps: The first switch and the second switch are controlled to be closed by the backup automatic switching device.

4. The method according to any one of claims 1 to 3, characterized in that, The method further comprises the following steps: In the case that the hydroelectric generating set is running, the hydroelectric generating set is controlled to supply power to the power grid, and based on a frequency change state of the power grid, a charging and discharging state of the flywheel energy storage module is adjusted to adjust the frequency of the power grid.

5. The method of claim 4, wherein, Based on the frequency change state of the power grid, the charging and discharging state of the flywheel energy storage module is adjusted to adjust the frequency of the power grid, and the method comprises the following steps: In the case that the frequency of the power grid is less than a first preset frequency, the flywheel energy storage module is controlled to discharge to the power grid; In the case that the frequency of the power grid is greater than a second preset frequency, the hydroelectric generating set is controlled to charge the flywheel energy storage module.

6. The method of claim 5, wherein, The flywheel energy storage module comprises a plurality of flywheel energy storage devices; the flywheel energy storage module is controlled to discharge to the power grid, and the method comprises the following steps: A second flywheel energy storage device in the plurality of flywheel energy storage devices is controlled to discharge to the power grid; The second flywheel energy storage device stores energy greater than a second preset energy.

7. The method of claim 6, wherein, The power supply system further comprises a second bus and a third switch, the third switch is connected between the second flywheel energy storage device and one end of the second bus, and the other end of the second bus is used for connecting the power grid; the second flywheel energy storage device in the plurality of flywheel energy storage devices is controlled to discharge to the power grid, and the method comprises the following steps: The third switch is controlled to be closed.

8. The method of claim 7, wherein, The power supply system further comprises a third bus, a bus tie switch and a fourth switch, one end of the third bus is connected with one end of the second bus through the bus tie switch, one end of the third bus is also connected with the hydroelectric generating set, the other end of the third bus is used for connecting the power grid, the other end of the second bus is used for connecting the power grid through the fourth switch; the method for controlling the hydroelectric generating set to charge the flywheel energy storage module comprises: controlling the bus tie switch to be closed and the fourth switch to be opened.

9. A controller characterized by comprising: The computer program is stored on the memory and can be run on the processor, and when the processor executes the computer program, the energy charging control method of the flywheel energy storage module is realized.

10. A computer-readable storage medium, characterized in that, The computer program is stored on the memory and can be run on the processor, and when the processor executes the computer program, the energy charging control method of the flywheel energy storage module is realized.

11. A charging control device of a flywheel energy storage module, characterized in that, The device is applied to a power supply system, and the power supply system comprises a hydroelectric generating set and a flywheel energy storage module, the hydroelectric generating set comprises a water turbine and a generator; the device comprises: a first control module, which is used for controlling a passage between the water turbine and the generator to be disconnected in response to a shutdown instruction of the hydroelectric generating set; a second control module, which is used for controlling a passage between the water turbine and the flywheel energy storage module to be connected, so that the water turbine charges the flywheel energy storage module.

12. A power supply system characterized by comprising: The power supply system comprises a hydroelectric generating set and a flywheel energy storage module, and a controller according to claim 9 or an energy charging control device of the flywheel energy storage module according to claim 11; the hydroelectric generating set comprises a water turbine and a generator.

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