Flywheel system control method and device

Abstract

The invention discloses a control method and device of a flywheel system. The flywheel system comprises a flywheel rotor and a doubly-fed asynchronous generator, the doubly-fed asynchronous generator comprises a generator stator, a generator rotor and a frequency converter, the flywheel rotor is in transmission connection with the generator rotor, the generator rotor is connected to a power grid through the frequency converter, and the generator stator is connected to the power grid; the method comprises: detecting the rotating speed of a flywheel rotor; and according to the rotating speed of the flywheel rotor, operating parameters of the generator rotor are adjusted through the frequency converter, so that the magnetic field rotating speed of the generator stator is kept at a set rotating speed. Therefore, the operation parameters of the generator rotor can be adjusted according to the rotation speed of the flywheel rotor, so that the magnetic field rotation speed of the generator stator is kept at the set rotation speed, it can be ensured that the doubly-fed asynchronous generator generates electric energy with the set frequency, then the doubly-fed asynchronous motor outputs the electric energy with the set frequency to a power grid, and the stability of the power grid is improved.

Description

Technical Field

[0001] The present invention relates to the field of energy technology, and in particular to a control method and device for a flywheel system, a flywheel system, an electronic device and a storage medium. Background Art

[0002] At present, flywheel energy storage technology is a kind of energy storage technology that stores energy in the form of kinetic energy. It has the advantages of fast climbing ability, high energy conversion efficiency, long service life, and easy installation, and has been widely used in the energy field. However, the flywheel control method in the related technology has problems such as low flexibility and low reliability of flywheel operation. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the above-mentioned technology at least to some extent.

[0004] To this end, an object of the present invention is to propose a control method for a flywheel system, which can adjust the operating parameters of the generator rotor according to the rotational speed of the flywheel rotor so that the magnetic field speed of the generator stator is maintained at a set speed, thereby ensuring that the doubly-fed asynchronous generator generates electrical energy of a set frequency, and then the doubly-fed asynchronous motor outputs electrical energy of a set frequency to the power grid, which helps to improve the stability of the power grid.

[0005] A second object of the present invention is to provide a control device for a flywheel system.

[0006] The third object of the present invention is to provide a flywheel system.

[0007] A fourth objective of the present invention is to provide an electronic device.

[0008] A fifth object of the present invention is to provide a computer-readable storage medium.

[0009] The first aspect of the present invention provides a control method for a flywheel system, wherein the flywheel system includes a flywheel rotor and a doubly-fed asynchronous generator, wherein the doubly-fed asynchronous generator includes a generator stator, a generator rotor and a frequency converter, wherein the flywheel rotor is transmission-connected to the generator rotor, the generator rotor is connected to a power grid via the frequency converter, and the generator stator is connected to the power grid; the method includes: detecting the rotational speed of the flywheel rotor; and adjusting the operating parameters of the generator rotor via the frequency converter according to the rotational speed of the flywheel rotor so that the magnetic field speed of the generator stator is maintained at a set speed.

[0010] According to the control method of the flywheel system of the embodiment of the present invention, the speed of the flywheel rotor is detected, and the operating parameters of the generator rotor are adjusted through the frequency converter according to the speed of the flywheel rotor, so that the magnetic field speed of the generator stator is maintained at the set speed. Therefore, the operating parameters of the generator rotor can be adjusted according to the speed of the flywheel rotor, so that the magnetic field speed of the generator stator is maintained at the set speed, which can ensure that the double-fed asynchronous generator generates electric energy of the set frequency, and then the double-fed asynchronous motor outputs electric energy of the set frequency to the power grid, which helps to improve the stability of the power grid.

[0011] In addition, the control method of the flywheel system proposed in the above embodiment of the present invention may also have the following additional technical features:

[0012] In one embodiment of the present invention, it also includes: detecting the operating parameters and / or grid parameters of the flywheel system; and switching the state of the double-fed asynchronous generator within multiple operating states according to the operating parameters and / or the grid parameters.

[0013] In one embodiment of the present invention, the state switching of the doubly-fed asynchronous generator within multiple operating states is performed according to the operating parameters and / or the grid parameters, including: if the rotational speed of the flywheel rotor is less than a first set threshold, and / or a charging instruction of the flywheel rotor is received, the operating state of the doubly-fed asynchronous generator is controlled to switch to a motor state, so that the doubly-fed asynchronous generator converts the first electrical energy of the grid into first kinetic energy, and controls the flywheel rotor to store the first kinetic energy.

[0014] In one embodiment of the present invention, the flywheel system also includes an electric motor, which is transmission-connected to the flywheel rotor. The method also includes: if the rotational speed of the flywheel rotor is less than a first set threshold, and / or a charging instruction of the flywheel rotor is received, controlling the electric motor to convert the first electrical energy of the power grid into first kinetic energy, and controlling the flywheel rotor to store the first kinetic energy.

[0015] In one embodiment of the present invention, the state switching of the doubly-fed asynchronous generator within multiple operating states is performed according to the operating parameters and / or the grid parameters, including: if the rotational speed of the flywheel rotor is less than a first set threshold, and / or a charging instruction of the flywheel rotor is received, controlling the operating state of the doubly-fed asynchronous generator to switch to a standby state.

[0016] In one embodiment of the present invention, the state switching of the doubly-fed asynchronous generator within multiple operating states is performed according to the operating parameters and / or the grid parameters, including: if the rotational speed of the flywheel rotor is greater than a second set threshold, and / or a discharge instruction of the flywheel rotor is received, the flywheel rotor is controlled to release the second kinetic energy, and the operating state of the doubly-fed asynchronous generator is controlled to switch to a generator state, so that the doubly-fed asynchronous generator converts the second kinetic energy into second electrical energy of a set frequency, and outputs the second electrical energy to the grid; wherein the first set threshold is less than or equal to the second set threshold.

[0017] In one embodiment of the present invention, the state switching of the doubly fed asynchronous generator within multiple operating states is performed according to the operating parameters and / or the grid parameters, including: if the grid voltage is less than a third set threshold, and / or the grid power factor is greater than a fourth set threshold, controlling the operating state of the doubly fed asynchronous generator to switch to a first phase adjustment state so that the doubly fed asynchronous generator outputs reactive power to the grid; if the grid voltage is greater than a fifth set threshold, and / or the grid power factor is less than a sixth set threshold, controlling the operating state of the doubly fed asynchronous generator to switch to a second phase adjustment state so that the doubly fed asynchronous generator absorbs reactive power from the grid; wherein the third set threshold is less than or equal to the fifth set threshold, and the sixth set threshold is less than or equal to the fourth set threshold.

[0018] In one embodiment of the present invention, the state switching of the doubly-fed asynchronous generator within multiple operating states is performed according to the operating parameters and / or the grid parameters, including: if the grid frequency is less than a seventh set threshold, controlling the flywheel rotor to release the second kinetic energy, and controlling the operating state of the doubly-fed asynchronous generator to switch to a generator state, so that the doubly-fed asynchronous generator converts the second kinetic energy into second electrical energy of a set frequency, and outputs the second electrical energy to the grid.

[0019] In one embodiment of the present invention, the state switching of the doubly-fed asynchronous generator within multiple operating states is performed according to the operating parameters and / or the grid parameters, including: if the grid frequency is greater than an eighth set threshold, controlling the operating state of the doubly-fed asynchronous generator to switch to a motor state, so that the doubly-fed asynchronous generator converts the first electrical energy of the grid into first kinetic energy, and controls the flywheel rotor to store the first kinetic energy; wherein the seventh set threshold is less than or equal to the eighth set threshold.

[0020] In one embodiment of the present invention, the state switching of the doubly-fed asynchronous generator within multiple operating states is performed according to the operating parameters and / or the grid parameters, including: according to the operating parameters and / or the grid parameters, identifying that the set standby conditions are currently met, and controlling the operating state of the doubly-fed asynchronous generator to switch to the standby state.

[0021] In one embodiment of the present invention, the operating parameters include at least one of the speed of the flywheel rotor and the speed of the doubly-fed asynchronous generator, and the grid parameters include at least one of the grid voltage, the grid power factor, and the grid frequency.

[0022] In one embodiment of the present invention, the flywheel system also includes a reactive compensation device, and the reactive compensation device is connected to a power grid. The method also includes: detecting operating parameters and / or power grid parameters of the flywheel system; according to the operating parameters and / or the power grid parameters, identifying whether the set reactive compensation conditions are currently met, and controlling the reactive compensation device or the doubly-fed asynchronous generator to perform reactive compensation on the power grid.

[0023] In one embodiment of the present invention, the method of identifying that the set reactive compensation condition is currently met based on the operating parameters and / or the grid parameters, and controlling the reactive compensation device or the double-fed asynchronous generator to perform reactive compensation on the grid includes: if the grid voltage is less than a third set threshold, and / or the grid power factor is greater than a fourth set threshold, identifying that the set first reactive compensation condition is currently met, and controlling the reactive compensation device to output reactive power to the grid; if the grid voltage is greater than a fifth set threshold, and / or the grid power factor is less than a sixth set threshold, identifying that the set second reactive compensation condition is currently met, and controlling the reactive compensation device to absorb reactive power from the grid; wherein the third set threshold is less than or equal to the fifth set threshold, and the sixth set threshold is less than or equal to the fourth set threshold.

[0024] In one embodiment of the present invention, the method of identifying that the set reactive compensation condition is currently met according to the operating parameters and / or the grid parameters, and controlling the reactive compensation device or the doubly-fed asynchronous generator to perform reactive compensation on the grid, includes: if the grid voltage is greater than or equal to the third set threshold and less than the ninth set threshold, and / or the grid power factor is less than or equal to the fourth set threshold and greater than the tenth set threshold, identifying that the set third reactive compensation condition is currently met, and controlling the doubly-fed asynchronous generator to output reactive power to the grid; if the grid voltage is less than or equal to the fifth set threshold and greater than the eleventh set threshold, and / or the grid power factor is greater than or equal to the sixth set threshold and less than the twelfth set threshold, identifying that the set fourth reactive compensation condition is currently met, and controlling the doubly-fed asynchronous generator to absorb reactive power from the grid; wherein the ninth set threshold is less than or equal to the eleventh set threshold, and the twelfth set threshold is less than or equal to the tenth set threshold.

[0025] In one embodiment of the present invention, the method further includes: in response to a reactive power compensation instruction, controlling the reactive power compensation device or the double-fed asynchronous generator to perform reactive power compensation on the power grid.

[0026] The second aspect of the present invention proposes a control device for a flywheel system, wherein the flywheel system includes a flywheel rotor and a doubly-fed asynchronous generator, wherein the doubly-fed asynchronous generator includes a generator stator, a generator rotor and a frequency converter, wherein the flywheel rotor is transmission-connected to the generator rotor, the generator rotor is connected to the power grid through the frequency converter, and the generator stator is connected to the power grid; the control device for the flywheel system includes: a detection module for detecting the rotational speed of the flywheel rotor; and a regulation module for adjusting the operating parameters of the generator rotor through the frequency converter according to the rotational speed of the flywheel rotor, so that the magnetic field speed of the generator stator is maintained at a set speed.

[0027] The control device of the flywheel system of the embodiment of the present invention detects the rotation speed of the flywheel rotor, and adjusts the operating parameters of the generator rotor through the frequency converter according to the rotation speed of the flywheel rotor, so that the magnetic field rotation speed of the generator stator is maintained at the set rotation speed. Therefore, the operating parameters of the generator rotor can be adjusted according to the rotation speed of the flywheel rotor, so that the magnetic field rotation speed of the generator stator is maintained at the set rotation speed, which can ensure that the double-fed asynchronous generator generates electric energy of the set frequency, and then the double-fed asynchronous motor outputs electric energy of the set frequency to the power grid, which helps to improve the stability of the power grid.

[0028] In addition, the control device of the flywheel system according to the above embodiment of the present invention may also have the following additional technical features:

[0029] In one embodiment of the present invention, the detection module is also used to: detect the operating parameters and / or grid parameters of the flywheel system; the device also includes: a switching module, and the switching module is used to: switch the state of the double-fed asynchronous generator within multiple operating states according to the operating parameters and / or the grid parameters.

[0030] In one embodiment of the present invention, the switching module is also used to: if the rotational speed of the flywheel rotor is less than a first set threshold value, and / or a charging instruction of the flywheel rotor is received, control the operating state of the doubly-fed asynchronous generator to switch to the motor state, so that the doubly-fed asynchronous generator converts the first electrical energy of the power grid into the first kinetic energy, and controls the flywheel rotor to store the first kinetic energy.

[0031] In one embodiment of the present invention, the flywheel system also includes an electric motor, which is transmission-connected to the flywheel rotor, and the device also includes: a control module, which is used to: if the rotational speed of the flywheel rotor is less than a first set threshold, and / or a charging instruction of the flywheel rotor is received, control the electric motor to convert the first electrical energy of the power grid into first kinetic energy, and control the flywheel rotor to store the first kinetic energy.

[0032] In one embodiment of the present invention, the switching module is also used to: if the rotational speed of the flywheel rotor is less than a first set threshold, and / or a charging instruction of the flywheel rotor is received, control the operating state of the doubly-fed asynchronous generator to switch to a standby state.

[0033] In one embodiment of the present invention, the switching module is also used to: if the rotational speed of the flywheel rotor is greater than a second set threshold value, and / or a discharge instruction of the flywheel rotor is received, control the flywheel rotor to release the second kinetic energy, and control the operating state of the doubly-fed asynchronous generator to switch to the generator state, so that the doubly-fed asynchronous generator converts the second kinetic energy into second electrical energy of a set frequency, and outputs the second electrical energy to the power grid; wherein the first set threshold value is less than or equal to the second set threshold value.

[0034] In one embodiment of the present invention, the switching module is also used to: if the grid voltage is less than a third set threshold value, and / or the grid power factor is greater than a fourth set threshold value, control the operating state of the doubly fed asynchronous generator to switch to a first phase adjustment state so that the doubly fed asynchronous generator outputs reactive power to the grid; if the grid voltage is greater than a fifth set threshold value, and / or the grid power factor is less than a sixth set threshold value, control the operating state of the doubly fed asynchronous generator to switch to a second phase adjustment state so that the doubly fed asynchronous generator absorbs reactive power from the grid; wherein the third set threshold value is less than or equal to the fifth set threshold value, and the sixth set threshold value is less than or equal to the fourth set threshold value.

[0035] In one embodiment of the present invention, the switching module is also used to: if the grid frequency is less than a seventh set threshold, control the flywheel rotor to release the second kinetic energy, and control the operating state of the doubly-fed asynchronous generator to switch to a generator state, so that the doubly-fed asynchronous generator converts the second kinetic energy into second electrical energy of a set frequency, and outputs the second electrical energy to the grid.

[0036] In one embodiment of the present invention, the switching module is also used to: if the grid frequency is greater than an eighth set threshold, control the operating state of the doubly-fed asynchronous generator to switch to a motor state, so that the doubly-fed asynchronous generator converts the first electrical energy of the grid into first kinetic energy, and controls the flywheel rotor to store the first kinetic energy; wherein the seventh set threshold is less than or equal to the eighth set threshold.

[0037] In one embodiment of the present invention, the switching module is further used to: identify that the set standby condition is currently met according to the operating parameters and / or the grid parameters, and control the operating state of the double-fed asynchronous generator to switch to the standby state.

[0038] In one embodiment of the present invention, the operating parameters include at least one of the speed of the flywheel rotor and the speed of the doubly-fed asynchronous generator, and the grid parameters include at least one of the grid voltage, the grid power factor, and the grid frequency.

[0039] In one embodiment of the present invention, the flywheel system also includes a reactive compensation device, which is connected to a power grid. The device also includes: a control module, which is used to: detect operating parameters and / or power grid parameters of the flywheel system; identify whether the set reactive compensation conditions are currently met based on the operating parameters and / or the power grid parameters, and control the reactive compensation device or the doubly-fed asynchronous generator to perform reactive compensation on the power grid.

[0040] In one embodiment of the present invention, the control module is also used to: if the grid voltage is less than a third set threshold, and / or the grid power factor is greater than a fourth set threshold, identify that the first set reactive compensation condition is currently met, and control the reactive compensation device to output reactive power to the grid; if the grid voltage is greater than a fifth set threshold, and / or the grid power factor is less than a sixth set threshold, identify that the second set reactive compensation condition is currently met, and control the reactive compensation device to absorb reactive power from the grid; wherein the third set threshold is less than or equal to the fifth set threshold, and the sixth set threshold is less than or equal to the fourth set threshold.

[0041] In one embodiment of the present invention, the control module is also used to: if the grid voltage is greater than or equal to the third set threshold and less than the ninth set threshold, and / or the grid power factor is less than or equal to the fourth set threshold and greater than the tenth set threshold, identify that the third reactive power compensation condition is currently met, and control the doubly fed asynchronous generator to output reactive power to the grid; if the grid voltage is less than or equal to the fifth set threshold and greater than the eleventh set threshold, and / or the grid power factor is greater than or equal to the sixth set threshold and less than the twelfth set threshold, identify that the fourth reactive power compensation condition is currently met, and control the doubly fed asynchronous generator to absorb reactive power from the grid; wherein the ninth set threshold is less than or equal to the eleventh set threshold, and the twelfth set threshold is less than or equal to the tenth set threshold.

[0042] In one embodiment of the present invention, the control module is further used to: in response to a reactive compensation instruction, control the reactive compensation device or the double-fed asynchronous generator to perform reactive compensation on the power grid.

[0043] The third aspect of the present invention proposes a flywheel system, which includes a flywheel rotor and a doubly fed asynchronous generator, the doubly fed asynchronous generator includes a generator stator, a generator rotor and a frequency converter, the flywheel rotor is transmission-connected to the generator rotor, the generator rotor is connected to the power grid through the frequency converter, and the generator stator is connected to the power grid; and the control device of the flywheel system described in the second aspect of the present invention.

[0044] In one embodiment of the present invention, the flywheel system further comprises an electric motor, which is drivingly connected to the flywheel rotor.

[0045] In one embodiment of the present invention, the flywheel system further comprises a reactive power compensation device, and the reactive power compensation device is connected to a power grid.

[0046] The flywheel system of the embodiment of the present invention detects the rotation speed of the flywheel rotor, and adjusts the operating parameters of the generator rotor through the frequency converter according to the rotation speed of the flywheel rotor, so that the magnetic field rotation speed of the generator stator is maintained at the set rotation speed. Therefore, the operating parameters of the generator rotor can be adjusted according to the rotation speed of the flywheel rotor, so that the magnetic field rotation speed of the generator stator is maintained at the set rotation speed, which can ensure that the double-fed asynchronous generator generates electric energy of the set frequency, and then the double-fed asynchronous motor outputs electric energy of the set frequency to the power grid, which helps to improve the stability of the power grid.

[0047] The fourth aspect of the present invention provides an electronic device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the control method of the flywheel system as described in the first aspect of the present invention is implemented.

[0048] The electronic device of the embodiment of the present invention detects the rotation speed of the flywheel rotor by executing the computer program stored in the memory through the processor, and adjusts the operating parameters of the generator rotor through the frequency converter according to the rotation speed of the flywheel rotor, so that the magnetic field rotation speed of the generator stator is maintained at the set rotation speed. Therefore, the operating parameters of the generator rotor can be adjusted according to the rotation speed of the flywheel rotor, so that the magnetic field rotation speed of the generator stator is maintained at the set rotation speed, which can ensure that the double-fed asynchronous generator generates electric energy of the set frequency, and then the double-fed asynchronous motor outputs electric energy of the set frequency to the power grid, which helps to improve the stability of the power grid.

[0049] The fifth aspect of the present application provides a computer-readable storage medium having a computer program stored thereon. When the program is executed by a processor, the control method of the flywheel system as described in the first aspect of the present application is implemented.

[0050] The computer-readable storage medium of the embodiment of the present invention detects the rotation speed of the flywheel rotor by storing a computer program and being executed by a processor. According to the rotation speed of the flywheel rotor, the operating parameters of the generator rotor are adjusted through the frequency converter so that the magnetic field rotation speed of the generator stator is maintained at a set rotation speed. Thus, the operating parameters of the generator rotor can be adjusted according to the rotation speed of the flywheel rotor so that the magnetic field rotation speed of the generator stator is maintained at a set rotation speed, which can ensure that the double-fed asynchronous generator generates electric energy of a set frequency, and then the double-fed asynchronous motor outputs electric energy of a set frequency to the power grid, which helps to improve the stability of the power grid.

[0051] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0053] Figure 1 A schematic diagram of the structure of a flywheel system according to an embodiment of the present invention;

[0054] Figure 2 is a schematic structural diagram of a flywheel system according to another embodiment of the present invention;

[0055] Figure 3 A schematic flow chart of a control method for a flywheel system according to an embodiment of the present invention;

[0056] Figure 4 is a flow chart of a control method of a flywheel system according to another embodiment of the present invention;

[0057] Figure 5 is a flow chart of a control method of a flywheel system according to another embodiment of the present invention;

[0058] Figure 6 is a flow chart of a control method of a flywheel system according to another embodiment of the present invention;

[0059] Figure 7 is a flow chart of a control method of a flywheel system according to another embodiment of the present invention;

[0060] Figure 8 is a flow chart of a control method of a flywheel system according to another embodiment of the present invention;

[0061] Fig. 9 is a flow chart of a control method of a flywheel system according to another embodiment of the present invention;

[0062] Fig.10 is a schematic structural diagram of a flywheel system according to another embodiment of the present invention;

[0063] Fig.11 is a schematic structural diagram of a flywheel system according to another embodiment of the present invention;

[0064] Fig.12 is a schematic structural diagram of a control device for a flywheel system according to an embodiment of the present invention;

[0065] Fig.13 is a schematic structural diagram of a flywheel system according to another embodiment of the present invention;

[0066] Fig.14 is a schematic structural diagram of a flywheel system according to another embodiment of the present invention;

[0067] Fig.15 FIG. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0068] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0069] The following describes a control method, device, flywheel system, electronic device and storage medium of a flywheel system according to an embodiment of the present invention in conjunction with the accompanying drawings.

[0070] Figure 1 Schematic diagram of the structure of a flywheel system according to an embodiment of the present invention.

[0071] like Figure 1 As shown, the flywheel system 100 of the embodiment of the present invention includes a flywheel rotor 111 and a doubly-fed asynchronous generator 30. The doubly-fed asynchronous generator 30 includes a generator stator, a generator rotor and a frequency converter 33. The flywheel rotor 111 is transmission-connected to the generator rotor. The generator rotor is connected to the power grid through the frequency converter 33, and the generator stator is connected to the power grid.

[0072] In one embodiment, if Figure 1 As shown, the flywheel rotor 111 is connected to the double-fed asynchronous generator 30 via a transmission shaft 41 .

[0073] It should be noted that there are no excessive restrictions on the double-fed asynchronous generator 30 and the inverter 33. For example, the inverter 33 may include a bidirectional back-to-back IGBT (Insulated Gate Bipolar Transistor) voltage source converter.

[0074] In one embodiment, if Figure 2 As shown, the flywheel system 100 of the embodiment of the present invention further includes an electric motor 112 , which is transmission-connected to the flywheel rotor 111 .

[0075] In one embodiment, if Figure 2 As shown, the electric motor 112 is connected to the flywheel rotor 111 via a transmission shaft 41 .

[0076] In one embodiment, if Figure 2 As shown, the flywheel system 100 of the embodiment of the present invention further includes a reactive power compensation device 110, and the reactive power compensation device 110 is connected to a power grid.

[0077] It should be noted that there are no excessive limitations on the reactive power compensation device 110 .

[0078] In one implementation, the reactive power compensation device 110 includes but is not limited to a switched capacitor bank, a static reactive power compensator, a static reactive power generator, and the like.

[0079] It should be noted that Figure 1 , 2 The flywheel system shown is only an example of the flywheel system in the embodiment of the present invention, and is not a limitation of the flywheel system in the embodiment of the present invention.

[0080] Figure 3 FIG. 1 is a flow chart of a control method for a flywheel system according to an embodiment of the present invention. It should be noted that the relevant contents of the flywheel system can be found in the above embodiments and will not be described in detail here.

[0081] S301, detecting the rotation speed of the flywheel rotor.

[0082] In one embodiment, the speed of the flywheel rotor may be detected according to a set period. It is understandable that the speed of the flywheel rotor is updated with the set period. It should be noted that there are no excessive restrictions on the set period, for example, the set period includes but is not limited to 1 second, 2 seconds, etc.

[0083] In one embodiment, the speed of the flywheel rotor can be detected by a speed sensor. For example, a speed sensor can be arranged on the flywheel rotor.

[0084] S302, adjusting the operating parameters of the generator rotor through the frequency converter according to the rotation speed of the flywheel rotor, so that the magnetic field rotation speed of the generator stator is maintained at a set rotation speed.

[0085] It should be noted that the "magnetic field speed of the generator stator" is not the mechanical rotation speed. The magnetic field speed of the generator stator is maintained at the set speed, so that the double-fed asynchronous generator generates electric energy of the set frequency, and then the double-fed asynchronous motor outputs electric energy of the set frequency to the power grid. There are no excessive restrictions on the set speed and set frequency. For example, the set speed is 3000rpm (revolutions per minute) and the set frequency is 50Hz (hertz).

[0086] It should be noted that the magnetic field speed of the generator stator = the speed of the flywheel rotor + the magnetic field speed matched by the operating parameters of the generator rotor. Among them, the speed of the flywheel rotor is equal to the mechanical speed of the generator rotor. There are no excessive restrictions on the operating parameters of the generator rotor. For example, the operating parameters of the generator rotor include but are not limited to the frequency, voltage, amplitude, phase, etc. of the generator rotor. For example, taking the operating parameter of the generator rotor as the current frequency of the generator rotor as an example, the magnetic field speed of the generator stator = the speed of the flywheel rotor + the magnetic field speed matched by the current frequency of the generator rotor.

[0087] In one embodiment, the operating parameters of the generator rotor are adjusted by a frequency converter according to the rotational speed of the flywheel rotor, which may include determining the magnetic field rotational speed that matches the operating parameters of the generator rotor according to the magnetic field rotational speed of the generator stator and the rotational speed of the flywheel rotor, determining the target value of the operating parameters of the generator rotor according to the magnetic field rotational speed that matches the operating parameters of the generator rotor, and adjusting the operating parameters of the generator rotor by the frequency converter based on the target value of the operating parameters of the generator rotor.

[0088] In one embodiment, determining the magnetic field speed that matches the operating parameters of the generator rotor based on the magnetic field speed of the generator stator and the speed of the flywheel rotor may include obtaining the difference between the magnetic field speed of the generator stator and the speed of the flywheel rotor, and determining the difference as the magnetic field speed that matches the operating parameters of the generator rotor.

[0089] In one embodiment, the magnetic field speed matched by the operating parameters of the generator rotor and the target value of the operating parameters of the generator rotor are in a preset corresponding relationship. For example, the double-fed asynchronous generator can be calibrated to establish a corresponding relationship between the magnetic field speed matched by the operating parameters of the generator rotor and the target value of the operating parameters of the generator rotor. For example, taking the operating parameter of the generator rotor as the current frequency of the generator rotor as an example, a corresponding relationship between the magnetic field speed matched by the current frequency of the generator rotor and the target value of the current frequency of the generator rotor can be established.

[0090] In one embodiment, the target value of the operating parameter of the generator rotor is determined based on the magnetic field speed that matches the operating parameter of the generator rotor, which may include using the magnetic field speed that matches the operating parameter of the generator rotor as a query key value, querying in a preset corresponding relationship, and determining the queried target value as the target value of the operating parameter of the generator rotor.

[0091] In one embodiment, based on the target value of the operating parameter of the generator rotor, adjusting the operating parameter of the generator rotor through the frequency converter may include adjusting the value of the operating parameter of the generator rotor to the target value through the frequency converter, and / or, based on the target value of the operating parameter of the generator rotor, determining the adjustment method of the operating parameter of the generator rotor, and adjusting the operating parameter of the generator rotor through the frequency converter according to the adjustment method. For example, the adjustment method may include increasing the value of the operating parameter, decreasing the value of the operating parameter, the adjustment amount, etc.

[0092] In summary, according to the control method of the flywheel system of the embodiment of the present invention, the speed of the flywheel rotor is detected, and according to the speed of the flywheel rotor, the operating parameters of the generator rotor are adjusted through the frequency converter so that the magnetic field speed of the generator stator is maintained at the set speed. Therefore, the operating parameters of the generator rotor can be adjusted according to the speed of the flywheel rotor so that the magnetic field speed of the generator stator is maintained at the set speed, which can ensure that the double-fed asynchronous generator generates electric energy of the set frequency, and then the double-fed asynchronous motor outputs electric energy of the set frequency to the power grid, which helps to improve the stability of the power grid.

[0093] Figure 4 FIG. 1 is a flow chart of a control method of a flywheel system according to another embodiment of the present invention. It should be noted that the relevant contents of the flywheel system can be found in the above embodiment and will not be described in detail here.

[0094] like Figure 4 As shown, the control method of the flywheel system of the embodiment of the present invention includes:

[0095] S401, detecting operating parameters of the flywheel system and / or grid parameters.

[0096] It should be noted that there are not too many restrictions on operating parameters and grid parameters. For example, operating parameters include but are not limited to the speed of the flywheel rotor, the speed of the doubly-fed asynchronous generator, etc., and grid parameters include but are not limited to the grid voltage, grid power factor, grid frequency, etc.

[0097] In one embodiment, the operating parameters and / or grid parameters of the flywheel system may be detected according to a set period. It is understandable that the operating parameters and / or grid parameters are updated according to the set period. It should be noted that there are no excessive restrictions on the set period, for example, the set period includes but is not limited to 1 second, 2 seconds, etc.

[0098] In one embodiment, the speed of the flywheel rotor and the speed of the doubly-fed asynchronous generator can be detected by a speed sensor. For example, a speed sensor can be provided on the flywheel rotor and the doubly-fed asynchronous generator, respectively.

[0099] In one embodiment, the grid voltage can be detected by a voltage sensor, and the grid frequency can be determined by the grid voltage. The grid power can be detected by a power sensor, and the grid power factor can be determined according to the ratio of active power to reactive power in the grid power. For example, the double-fed asynchronous generator is connected to the grid through an access device, and a voltage sensor and a power sensor can be set on the access device. It should be noted that there are no excessive restrictions on the access device. For example, the access device includes but is not limited to a transmission line, a transformer, etc.

[0100] S402, switching the state of the double-fed asynchronous generator within multiple operating states according to the operating parameters and / or grid parameters.

[0101] It should be noted that in the embodiments of the present invention, the doubly-fed asynchronous generator may have multiple operating states, and there are no excessive restrictions on the operating states. For example, the operating states include but are not limited to phase adjustment state, motor state, generator state, standby state, etc.

[0102] Wherein, when the operating state of the double-fed asynchronous generator is the phase adjustment state, the double-fed asynchronous generator outputs reactive power to the power grid or absorbs reactive power from the power grid.

[0103] When the operation state of the double-fed asynchronous generator is the motor state, the double-fed asynchronous generator converts the first electric energy of the grid into the first kinetic energy, that is, the double-fed asynchronous generator absorbs electric energy from the grid at this time.

[0104] Among them, when the operating state of the doubly-fed asynchronous generator is the generator state, the doubly-fed asynchronous generator converts the second kinetic energy of the flywheel rotor into the second electric energy of the set frequency, and outputs the second electric energy to the power grid, that is, at this time, the doubly-fed asynchronous generator outputs the electric energy of the set frequency to the power grid. It should be noted that there is no excessive limitation on the set frequency, for example, the set frequency is 50 Hz (Hertz). It can be understood that the speed of the speed change device is maintained at the set speed, and then the doubly-fed asynchronous generator can be driven to generate the second electric energy of the set frequency.

[0105] Among them, when the operating state of the doubly-fed asynchronous generator is the standby state, the doubly-fed asynchronous generator remains connected to the grid, does not output reactive power to the grid, does not absorb reactive power from the grid, does not absorb electric energy from the grid, and does not output electric energy to the grid, that is, does not perform any action.

[0106] In one embodiment, the state switching of the doubly-fed asynchronous generator within multiple operating states according to the operating parameters and / or the grid parameters may include identifying the switching condition that currently satisfies the target operating state according to the operating parameters and / or the grid parameters, and controlling the operating state of the doubly-fed asynchronous generator to switch to the target operating state. It should be noted that the switching condition is not overly limited. It is understandable that different operating states may correspond to different switching conditions.

[0107] In one embodiment, a mapping relationship or a mapping table between the operating state and the switching condition may be pre-established. For example, the mapping relationship or the mapping table may be pre-set in a storage space of the flywheel system, for example, the storage space of the flywheel system may include a storage space of a controller of the flywheel system.

[0108] Therefore, the method can comprehensively consider the operating parameters and / or grid parameters to identify whether the switching conditions of the target operating state are currently met. When the switching conditions of the target operating state are currently met, the operating state of the double-fed asynchronous generator is controlled to switch to the target operating state.

[0109] In summary, according to the control method of the flywheel system of the embodiment of the present invention, the operating parameters and / or grid parameters of the flywheel system are detected, and the state switching of the double-fed asynchronous generator within multiple operating states is performed according to the operating parameters and / or grid parameters. Therefore, the operating parameters and / or grid parameters of the flywheel system can be comprehensively considered, and the state switching of the double-fed asynchronous generator within multiple operating states can be performed, which helps to improve the switching accuracy and flexibility of the operating state of the double-fed asynchronous generator and ensure the normal operation of the flywheel system.

[0110] Based on any of the above embodiments, the operating parameters of the flywheel system include the rotational speed of the flywheel rotor.

[0111] Figure 5 The figure is a flow chart of a control method of a flywheel system according to another embodiment of the present invention.

[0112] like Figure 5 As shown, the control method of the flywheel system of the embodiment of the present invention includes:

[0113] S501, detecting operating parameters of a flywheel system and / or grid parameters.

[0114] It should be noted that the relevant contents of step S501 can be found in the above embodiment and will not be described again here.

[0115] S502: If the rotation speed of the flywheel rotor is less than a first set threshold, and / or a charging instruction of the flywheel rotor is received, the operating state of the doubly-fed asynchronous generator is controlled to switch to the motor state, so that the doubly-fed asynchronous generator converts the first electrical energy of the power grid into the first kinetic energy, and controls the flywheel rotor to store the first kinetic energy.

[0116] In an embodiment of the present invention, if the speed of the flywheel rotor is less than the first set threshold, indicating that the speed of the flywheel rotor is low, and / or a charging instruction of the flywheel rotor is received, the operating state of the doubly-fed asynchronous generator can be controlled to switch to the motor state, so that the doubly-fed asynchronous generator converts the first electrical energy of the power grid into the first kinetic energy, and controls the flywheel rotor to store the first kinetic energy. It can be understood that at this time, the doubly-fed asynchronous generator can drive the speed of the flywheel rotor to increase through the speed change device, that is, controlling the flywheel rotor to store the first kinetic energy can be achieved by increasing the speed of the flywheel rotor.

[0117] It should be noted that there are no excessive restrictions on the first set threshold value. For example, the first set threshold value is the minimum rotation speed allowed by the flywheel rotor, and the first set threshold value is 100 rpm.

[0118] In one embodiment, the user can issue a charging instruction to the flywheel rotor through a remote controller, a flywheel control platform in a server, or a control panel on the flywheel system in a non-contact manner such as language or gestures. Correspondingly, the flywheel system can obtain the above charging instruction.

[0119] S503: If the rotation speed of the flywheel rotor is greater than the second set threshold value, and / or a discharge instruction of the flywheel rotor is received, the flywheel rotor is controlled to release the second kinetic energy, and the operating state of the doubly-fed asynchronous generator is controlled to switch to the generator state, so that the doubly-fed asynchronous generator converts the second kinetic energy into the second electrical energy of the set frequency and outputs the second electrical energy to the power grid.

[0120] It should be noted that the first set threshold is less than or equal to the second set threshold.

[0121] In an embodiment of the present invention, if the speed of the flywheel rotor is greater than the second set threshold, indicating that the speed of the flywheel rotor is relatively high, and / or a discharge instruction of the flywheel rotor is received, the flywheel rotor can be controlled to release the second kinetic energy, and the operating state of the doubly-fed asynchronous generator can be controlled to switch to the generator state, so that the doubly-fed asynchronous generator converts the second kinetic energy into the second electrical energy of the set frequency, and outputs the second electrical energy to the power grid. It can be understood that controlling the flywheel rotor to release the second kinetic energy can be achieved by reducing the speed of the flywheel rotor, at which time the flywheel rotor can drive the doubly-fed asynchronous generator through a speed change device to generate the second electrical energy of the set frequency.

[0122] It should be noted that there are no excessive restrictions on the second set threshold. For example, the second set threshold is the maximum rotation speed allowed by the flywheel rotor, and the second set threshold is 1000000 rpm.

[0123] It should be noted that the relevant contents of the discharge instruction can be found in the above embodiments and will not be described in detail here.

[0124] In summary, according to the control method of the flywheel system of the embodiment of the present invention, the speed of the flywheel rotor and / or the charging instruction can be comprehensively considered to control the operating state of the doubly fed asynchronous generator to switch to the motor state, or the speed of the flywheel rotor and / or the discharge instruction can be comprehensively considered to control the operating state of the doubly fed asynchronous generator to switch to the generator state to adjust the speed of the flywheel rotor, which can effectively avoid the speed of the flywheel rotor being too low or too high, so that the speed of the flywheel rotor is maintained within a reasonable range, thereby ensuring the normal operation of the flywheel system.

[0125] Based on any of the above embodiments, the operating parameters of the flywheel system include the rotation speed of the flywheel rotor. The flywheel system also includes an electric motor, which is drivingly connected to the flywheel rotor.

[0126] Figure 6 The figure is a flow chart of a control method of a flywheel system according to another embodiment of the present invention.

[0127] like Figure 6 As shown, the control method of the flywheel system of the embodiment of the present invention includes:

[0128] S601, detecting operating parameters of the flywheel system and / or grid parameters.

[0129] It should be noted that the relevant content of step S601 can be found in the above embodiment and will not be repeated here.

[0130] S602: If the rotation speed of the flywheel rotor is less than a first set threshold, and / or a charging instruction of the flywheel rotor is received, the electric motor is controlled to convert the first electrical energy of the grid into the first kinetic energy, and the flywheel rotor is controlled to store the first kinetic energy.

[0131] In an embodiment of the present invention, if the speed of the flywheel rotor is less than the first set threshold, indicating that the speed of the flywheel rotor is low, and / or a charging instruction of the flywheel rotor is received, the motor can be controlled to convert the first electrical energy of the power grid into the first kinetic energy, and the flywheel rotor can be controlled to store the first kinetic energy. It can be understood that at this time, the motor can drive the speed of the flywheel rotor to increase, that is, controlling the flywheel rotor to store the first kinetic energy can be achieved by increasing the speed of the flywheel rotor. It should be noted that the relevant contents of the first set threshold and the charging instruction can be referred to the above embodiment, and will not be repeated here.

[0132] In one embodiment, the state switching of the doubly-fed asynchronous generator within multiple operating states is performed according to operating parameters and / or grid parameters, which may include controlling the operating state of the doubly-fed asynchronous generator to switch to a standby state if the speed of the flywheel rotor is less than a first set threshold and / or a charging instruction of the flywheel rotor is received.

[0133] S603: If the rotation speed of the flywheel rotor is greater than the second set threshold value, and / or a discharge instruction of the flywheel rotor is received, the flywheel rotor is controlled to release the second kinetic energy, and the operating state of the doubly-fed asynchronous generator is controlled to switch to the generator state, so that the doubly-fed asynchronous generator converts the second kinetic energy into the second electrical energy of the set frequency and outputs the second electrical energy to the power grid.

[0134] It should be noted that the relevant content of step S603 can be found in the above embodiment and will not be repeated here.

[0135] In summary, according to the control method of the flywheel system of an embodiment of the present invention, the flywheel system also includes an electric motor, which is transmission-connected to the flywheel rotor. The speed of the flywheel rotor and / or the charging instruction can be comprehensively considered to control the electric motor to convert the first electrical energy of the power grid into the first kinetic energy, or the speed of the flywheel rotor and / or the discharge instruction can be comprehensively considered to control the operating state of the doubly-fed asynchronous generator to switch to the generator state to adjust the speed of the flywheel rotor. This can effectively prevent the speed of the flywheel rotor from being too low or too high, so that the speed of the flywheel rotor is maintained within a reasonable range, thereby ensuring the normal operation of the flywheel system.

[0136] Based on any of the above embodiments, the grid parameters include grid voltage and grid power factor.

[0137] Figure 7 The figure is a flow chart of a control method of a flywheel system according to another embodiment of the present invention.

[0138] like Figure 7 As shown, the control method of the flywheel system of the embodiment of the present invention includes:

[0139] S701, detecting operating parameters of the flywheel system and / or grid parameters.

[0140] It should be noted that the relevant content of step S701 can be found in the above embodiment and will not be repeated here.

[0141] S702: If the grid voltage is less than a third set threshold value, and / or the grid power factor is greater than a fourth set threshold value, the operating state of the doubly-fed asynchronous generator is controlled to switch to a first phase modulation state so that the doubly-fed asynchronous generator outputs reactive power to the grid.

[0142] In an embodiment of the present invention, if the grid voltage is less than the third set threshold value, and / or the grid power factor is greater than the fourth set threshold value, indicating that the grid voltage is low and / or the grid power factor is high, the operating state of the doubly-fed asynchronous generator can be controlled to switch to the first phase modulation state, so that the doubly-fed asynchronous generator outputs reactive power to the grid, thereby increasing the grid voltage and / or reducing the grid power factor.

[0143] In one embodiment, controlling the operating state of the doubly-fed asynchronous generator to switch to the first phase modulation state may include increasing the excitation current of the doubly-fed asynchronous generator so that the doubly-fed asynchronous generator is in an over-excited state, so that the doubly-fed asynchronous generator outputs reactive power to the power grid.

[0144] It should be noted that there are no excessive restrictions on the third set threshold and the fourth set threshold. For example, the third set threshold is the lowest voltage allowed by the power grid, and the fourth set threshold is the highest power factor allowed by the power grid.

[0145] S703: If the grid voltage is greater than the fifth set threshold, and / or the grid power factor is less than the sixth set threshold, control the operating state of the doubly-fed asynchronous generator to switch to the second phase adjustment state so that the doubly-fed asynchronous generator absorbs reactive power from the grid.

[0146] It should be noted that the third set threshold is less than or equal to the fifth set threshold, and the sixth set threshold is less than or equal to the fourth set threshold.

[0147] In an embodiment of the present invention, if the grid voltage is greater than the fifth set threshold value, and / or the grid power factor is less than the sixth set threshold value, indicating that the grid voltage is high and / or the grid power factor is low, the operating state of the doubly-fed asynchronous generator can be controlled to switch to the second phase modulation state so that the doubly-fed asynchronous generator absorbs reactive power from the grid.

[0148] In one embodiment, controlling the operating state of the doubly-fed asynchronous generator to switch to the second phase adjustment state may include reducing the excitation current of the doubly-fed asynchronous generator so that the doubly-fed asynchronous generator is in an under-excited state, so that the doubly-fed asynchronous generator absorbs reactive power from the power grid.

[0149] It should be noted that there are no excessive restrictions on the fifth set threshold and the sixth set threshold. For example, the fifth set threshold is the highest voltage allowed by the power grid, and the sixth set threshold is the lowest power factor allowed by the power grid.

[0150] In summary, according to the control method of the flywheel system of the embodiment of the present invention, the grid voltage and / or grid power factor can be comprehensively considered, and the operating state of the double-fed asynchronous generator can be controlled to switch to the first phase-adjusting state or the second phase-adjusting state to adjust the grid voltage and / or grid power factor, which can effectively avoid the grid voltage and / or grid power factor being too low or too high, so that the grid voltage and / or grid power factor are kept within a reasonable range, thereby ensuring the normal operation of the flywheel system.

[0151] Based on any of the above embodiments, the grid parameter includes grid frequency.

[0152] Figure 8 The figure is a flow chart of a control method of a flywheel system according to another embodiment of the present invention.

[0153] like Figure 8 As shown, the control method of the flywheel system of the embodiment of the present invention includes:

[0154] S801, detecting operating parameters of the flywheel system and / or grid parameters.

[0155] It should be noted that the relevant contents of step S801 can be found in the above embodiment and will not be repeated here.

[0156] S802, if the grid frequency is less than the seventh set threshold, control the flywheel rotor to release the second kinetic energy, and control the operating state of the doubly-fed asynchronous generator to switch to the generator state, so that the doubly-fed asynchronous generator converts the second kinetic energy into the second electrical energy of the set frequency and outputs the second electrical energy to the grid.

[0157] In an embodiment of the present invention, if the grid frequency is less than the seventh set threshold value, indicating that the grid frequency is low, the flywheel rotor can be controlled to release the second kinetic energy, and the operating state of the doubly-fed asynchronous generator can be controlled to switch to the generator state, so that the doubly-fed asynchronous generator converts the second kinetic energy into the second electric energy of the set frequency, and outputs the second electric energy to the grid. It can be understood that controlling the flywheel rotor to release the second kinetic energy can be achieved by reducing the speed of the flywheel rotor. At this time, the flywheel rotor can drive the doubly-fed asynchronous generator to generate the second electric energy of the set frequency through the speed change device, and output the second electric energy of the set frequency to the grid, thereby increasing the grid frequency.

[0158] It should be noted that there is no excessive limitation on the seventh setting threshold, for example, the seventh setting threshold is 50 Hz.

[0159] S803, if the grid frequency is greater than the eighth set threshold, control the operating state of the doubly-fed asynchronous generator to switch to the motor state, so that the doubly-fed asynchronous generator converts the first electrical energy of the grid into the first kinetic energy, and controls the flywheel rotor to store the first kinetic energy.

[0160] It should be noted that the seventh set threshold is less than or equal to the eighth set threshold.

[0161] In an embodiment of the present invention, if the grid frequency is greater than the eighth set threshold value, indicating that the grid frequency is relatively high, the operation state of the doubly-fed asynchronous generator can be controlled to switch to the motor state, so that the doubly-fed asynchronous generator converts the first electrical energy of the grid into the first kinetic energy, and controls the flywheel rotor to store the first kinetic energy. It can be understood that at this time, the doubly-fed asynchronous generator absorbs electrical energy from the grid, thereby reducing the grid frequency, and the doubly-fed asynchronous generator can increase the speed of the flywheel rotor by driving the speed change device, that is, controlling the flywheel rotor to store the first kinetic energy can be achieved by increasing the speed of the flywheel rotor.

[0162] It should be noted that there is no excessive limitation on the eighth set threshold, for example, the eighth set threshold is 50 Hz.

[0163] In summary, according to the control method of the flywheel system in an embodiment of the present invention, the operating state of the doubly-fed asynchronous generator can be controlled to switch to the motor state or the generator state according to the grid frequency to adjust the grid frequency, which can effectively prevent the grid frequency from being too low or too high, so that the grid voltage is kept within a reasonable range, thereby ensuring the normal operation of the flywheel system.

[0164] On the basis of any of the above embodiments, the rotational speed of the doubly-fed asynchronous generator is positively correlated with the grid frequency. Then, in step S402, the doubly-fed asynchronous generator is switched within multiple operating states according to the operating parameters and / or grid parameters, including if the rotational speed of the doubly-fed asynchronous generator is less than a thirteenth set threshold, indicating that the grid frequency is low, controlling the flywheel rotor to release the second kinetic energy, and controlling the operating state of the doubly-fed asynchronous generator to switch to the generator state, so that the doubly-fed asynchronous generator converts the second kinetic energy into second electrical energy of a set frequency, and outputs the second electrical energy to the grid.

[0165] If the rotation speed of the doubly-fed asynchronous generator is greater than the fourteenth set threshold, indicating that the grid frequency is high, the operating state of the doubly-fed asynchronous generator is controlled to switch to the motor state, so that the doubly-fed asynchronous generator converts the first electrical energy of the grid into the first kinetic energy, and controls the flywheel rotor to store the first kinetic energy.

[0166] It should be noted that the thirteenth setting threshold is less than or equal to the fourteenth setting threshold. There are no excessive restrictions on the thirteenth setting threshold and the fourteenth setting threshold. For example, the thirteenth setting threshold and the fourteenth setting threshold are 3000 rpm.

[0167] Therefore, in this method, the operating state of the doubly-fed asynchronous generator can be controlled to switch to the motor state or the generator state according to the rotational speed of the doubly-fed asynchronous generator to adjust the grid frequency, which can effectively prevent the grid frequency from being too low or too high, so that the grid voltage is kept within a reasonable range, thereby ensuring the normal operation of the flywheel system.

[0168] Based on any of the above embodiments, in step S402, the state of the double-fed asynchronous generator is switched within multiple operating states according to the operating parameters and / or grid parameters, which may include identifying that the set standby conditions are currently met according to the operating parameters and / or grid parameters, and controlling the operating state of the double-fed asynchronous generator to switch to the standby state.

[0169] It should be noted that there are no excessive restrictions on setting the standby conditions. For example, the standby conditions may include that the speed of the flywheel rotor is greater than or equal to the first set threshold and less than or equal to the second set threshold, and / or the grid voltage is greater than or equal to the third set threshold and less than or equal to the fifth set threshold, and / or the grid power factor is greater than or equal to the sixth set threshold and less than or equal to the fourth set threshold, and / or the grid frequency is greater than or equal to the seventh set threshold and less than or equal to the eighth set threshold, and / or the speed of the doubly-fed asynchronous generator is greater than or equal to the thirteenth set threshold and less than or equal to the fourteenth set threshold.

[0170] It should be noted that, for the relevant contents of the standby state, reference can be made to the above embodiments, which will not be described in detail here.

[0171] Therefore, the method can comprehensively consider the operating parameters and / or grid parameters to identify whether the set standby conditions are currently met. When the set standby conditions are currently met, the operating state of the double-fed asynchronous generator is controlled to switch to the standby state.

[0172] Based on any of the above embodiments, the flywheel system further includes a reactive power compensation device, which is connected to a power grid.

[0173] Fig. 9 The figure is a flow chart of a control method of a flywheel system according to another embodiment of the present invention.

[0174] like Fig. 9 As shown, the control method of the flywheel system of the embodiment of the present invention includes:

[0175] S901, detecting operating parameters of the flywheel system and / or grid parameters.

[0176] It should be noted that the relevant content of step S901 can be found in the above embodiment and will not be repeated here.

[0177] S902, according to the operating parameters and / or the grid parameters, identifying that the set reactive power compensation conditions are currently met, and controlling the reactive power compensation device or the double-fed asynchronous generator to perform reactive power compensation on the grid.

[0178] It should be noted that both the reactive power compensation device and the doubly-fed asynchronous generator can perform reactive power compensation on the power grid, and the reactive power compensation device has a higher reactive power compensation capability than the doubly-fed asynchronous generator. It should be noted that when the flywheel system includes a reactive power compensation device, the doubly-fed asynchronous generator does not have a phase adjustment state.

[0179] It should be noted that there are no excessive restrictions on setting reactive power compensation conditions.

[0180] In one embodiment, based on operating parameters and / or grid parameters, it is identified that the set reactive compensation conditions are currently met, and the reactive compensation device or the doubly-fed asynchronous generator is controlled to perform reactive compensation on the grid, including if the grid voltage is less than a third set threshold, and / or the grid power factor is greater than a fourth set threshold, indicating that the grid voltage is low, and / or the grid power factor is high, identifying that the set first reactive compensation conditions are currently met, controlling the reactive compensation device to output reactive power to the grid, thereby increasing the grid voltage, and / or reducing the grid power factor.

[0181] If the grid voltage is greater than the fifth set threshold, and / or the grid power factor is less than the sixth set threshold, it indicates that the grid voltage is high and / or the grid power factor is low. It is recognized that the second reactive compensation condition is currently met, and the reactive compensation device is controlled to absorb reactive power from the grid, thereby reducing the grid voltage and / or improving the grid power factor.

[0182] It should be noted that the relevant contents of the third to sixth setting thresholds can be found in the above embodiments and will not be repeated here.

[0183] In one embodiment, according to the operating parameters and / or the grid parameters, it is identified that the set reactive compensation conditions are currently met, and the reactive compensation device or the doubly-fed asynchronous generator is controlled to perform reactive compensation on the grid, including if the grid voltage is greater than or equal to a third set threshold and less than a ninth set threshold, and / or the grid power factor is less than or equal to a fourth set threshold and greater than a tenth set threshold, indicating that the grid voltage is low and / or the grid power factor is high, it is identified that the set third reactive compensation conditions are currently met, and the doubly-fed asynchronous generator is controlled to output reactive power to the grid, thereby increasing the grid voltage and / or reducing the grid power factor.

[0184] If the grid voltage is less than or equal to the fifth set threshold and greater than the eleventh set threshold, and / or the grid power factor is greater than or equal to the sixth set threshold and less than the twelfth set threshold, it indicates that the grid voltage is high and / or the grid power factor is low. It is recognized that the fourth reactive power compensation condition is currently met, and the double-fed asynchronous generator is controlled to absorb reactive power from the grid, thereby reducing the grid voltage and / or improving the grid power factor.

[0185] It should be noted that the ninth setting threshold is less than or equal to the eleventh setting threshold, and the twelfth setting threshold is less than or equal to the tenth setting threshold. There are no excessive restrictions on the ninth to twelfth setting thresholds. For example, the ninth setting threshold is the minimum voltage allowed for the doubly-fed asynchronous generator to perform reactive power compensation, the tenth setting threshold is the maximum power factor allowed for the doubly-fed asynchronous generator to perform reactive power compensation, the eleventh setting threshold is the maximum voltage allowed for the doubly-fed asynchronous generator to perform reactive power compensation, and the twelfth setting threshold is the minimum power factor allowed for the doubly-fed asynchronous generator to perform reactive power compensation.

[0186] In one embodiment, in response to the reactive power compensation instruction, the reactive power compensation device or the doubly-fed asynchronous generator may be controlled to perform reactive power compensation on the power grid. For example, the identifier of the device that performs reactive power compensation on the power grid may be extracted from the reactive power compensation instruction, wherein the identifier of the device is the identifier of the reactive power compensation device or the identifier of the doubly-fed asynchronous generator, and in response to the identifier of the device being the identifier of the reactive power compensation device, the reactive power compensation device may be controlled to perform reactive power compensation on the power grid, or in response to the identifier of the device being the identifier of the doubly-fed asynchronous generator, the doubly-fed asynchronous generator may be controlled to perform reactive power compensation on the power grid.

[0187] In one implementation, the user can issue reactive power compensation instructions through a remote controller, a flywheel control platform in a server, or a control panel on a flywheel system in a non-contact manner such as language or gestures. Correspondingly, the flywheel system can obtain the reactive power compensation instructions.

[0188] In summary, according to the control method of the flywheel system of the embodiment of the present invention, the operating parameters and / or grid parameters of the flywheel system are detected, and according to the operating parameters and / or grid parameters, the reactive power compensation condition currently satisfied is identified, and the reactive power compensation device or the doubly-fed asynchronous generator is controlled to perform reactive power compensation on the grid. Therefore, the operating parameters and / or grid parameters of the flywheel system can be comprehensively considered to identify the reactive power compensation condition currently satisfied, and then the reactive power compensation device or the doubly-fed asynchronous generator can be controlled to perform reactive power compensation on the grid, which also helps to improve the stability of the grid and ensure the normal operation of the flywheel system.

[0189] Based on any of the above embodiments, Fig.10 As shown, the flywheel system 100 of the embodiment of the present invention includes a flywheel rotor 111 , a double-fed asynchronous generator 30 , a power grid detection device 60 , a controller 70 and an energy management device 80 .

[0190] The power grid detection device 60 is used to detect power grid parameters, the energy management device 80 is used to generate control instructions of the flywheel system according to the operating parameters and / or power grid parameters of the flywheel system 100, and / or receive control instructions of the flywheel system, and the controller 70 is used to control the flywheel system according to the control instructions of the flywheel system. The control instructions of the flywheel system include state switching instructions of the doubly-fed asynchronous generator and / or adjustment instructions of the operating parameters of the generator rotor.

[0191] In one embodiment, the control instructions of the flywheel system include but are not limited to kinetic energy release instructions and kinetic energy storage instructions of the flywheel rotor.

[0192] In one embodiment, if Fig.10 As shown, the power grid detection device 60 is connected to the energy management device 80 via a communication line 86, the energy management device 80 is connected to the controller 70 via a communication line 87, the controller 70 is connected to the flywheel rotor 111 via a communication line 71, and the controller 70 is connected to the double-fed asynchronous generator 30 via a communication line 73.

[0193] In one embodiment, if Fig.11 As shown, the flywheel system 100 of the embodiment of the present invention further includes an electric motor 112 , and the electric motor 112 is transmission-connected to the flywheel rotor 111 .

[0194] In one embodiment, if Fig.11 As shown, the flywheel system 100 of the embodiment of the present invention further includes a reactive power compensation device 110, and the reactive power compensation device 110 is connected to a power grid.

[0195] It should be noted that Fig.10 , 11The flywheel system shown is only an example of the flywheel system in the embodiment of the present invention, and is not a limitation of the flywheel system in the embodiment of the present invention.

[0196] In order to implement the above embodiment, the present invention also provides a control device for a flywheel system.

[0197] Fig.12 The structure diagram of the control device of the flywheel system according to one embodiment of the present invention is shown. The flywheel system includes a flywheel rotor and a double-fed asynchronous generator, the double-fed asynchronous generator includes a generator stator, a generator rotor and a frequency converter, the flywheel rotor is drivingly connected to the generator rotor, the generator rotor is connected to the power grid through the frequency converter, and the generator stator is connected to the power grid;

[0198] like Fig.12 As shown, the control device 200 of the flywheel system according to the embodiment of the present invention includes: a detection module 210 and a regulation module 220 .

[0199] The detection module 210 is used to detect the rotation speed of the flywheel rotor;

[0200] The regulating module 220 is used to regulate the operating parameters of the generator rotor through the frequency converter according to the rotation speed of the flywheel rotor, so as to keep the magnetic field rotation speed of the generator stator at a set rotation speed.

[0201] In one embodiment of the present invention, the detection module 210 is also used to: detect the operating parameters and / or grid parameters of the flywheel system; the control device 200 of the flywheel system also includes: a switching module, and the switching module is used to: switch the state of the double-fed asynchronous generator within multiple operating states according to the operating parameters and / or the grid parameters.

[0202] In one embodiment of the present invention, the flywheel system also includes an electric motor, which is transmission-connected to the flywheel rotor, and the device also includes: a control module, which is used to: if the rotational speed of the flywheel rotor is less than a first set threshold, and / or a charging instruction of the flywheel rotor is received, control the electric motor to convert the first electrical energy of the power grid into first kinetic energy, and control the flywheel rotor to store the first kinetic energy.

[0203] In one embodiment of the present invention, the switching module is also used to: if the rotational speed of the flywheel rotor is less than a first set threshold, and / or a charging instruction of the flywheel rotor is received, control the operating state of the doubly-fed asynchronous generator to switch to a standby state.

[0204] In one embodiment of the present invention, the switching module is also used to: if the rotational speed of the flywheel rotor is greater than a second set threshold value, and / or a discharge instruction of the flywheel rotor is received, control the flywheel rotor to release the second kinetic energy, and control the operating state of the doubly-fed asynchronous generator to switch to the generator state, so that the doubly-fed asynchronous generator converts the second kinetic energy into second electrical energy of a set frequency, and outputs the second electrical energy to the power grid; wherein the first set threshold value is less than or equal to the second set threshold value.

[0205] In one embodiment of the present invention, the switching module is also used to: if the rotational speed of the flywheel rotor is less than a first set threshold value, and / or a charging instruction of the flywheel rotor is received, control the operating state of the doubly-fed asynchronous generator to switch to the motor state, so that the doubly-fed asynchronous generator converts the first electrical energy of the power grid into the first kinetic energy, and controls the flywheel rotor to store the first kinetic energy.

[0206] In one embodiment of the present invention, the switching module is also used to: if the rotational speed of the flywheel rotor is greater than a second set threshold, and / or a discharge instruction of the flywheel rotor is received, control the flywheel rotor to release the second kinetic energy, and control the operating state of the doubly fed asynchronous generator to switch to the generator state, so that the doubly fed asynchronous generator converts the second kinetic energy into second electrical energy of a set frequency, and outputs the second electrical energy to the power grid; wherein the first set threshold is less than or equal to the second set threshold.

[0207] In one embodiment of the present invention, the switching module is also used to: if the grid voltage is less than a third set threshold, and / or the grid power factor is greater than a fourth set threshold, control the operating state of the doubly fed asynchronous generator to switch to a first phase adjustment state so that the doubly fed asynchronous generator outputs reactive power to the grid; if the grid voltage is greater than a fifth set threshold, and / or the grid power factor is less than a sixth set threshold, control the operating state of the doubly fed asynchronous generator to switch to a second phase adjustment state so that the doubly fed asynchronous generator absorbs reactive power from the grid; wherein the third set threshold is less than or equal to the fifth set threshold, and the sixth set threshold is less than or equal to the fourth set threshold.

[0208] In one embodiment of the present invention, the switching module is also used to: if the grid frequency is less than a seventh set threshold, control the flywheel rotor to release the second kinetic energy, and control the operating state of the doubly-fed asynchronous generator to switch to a generator state, so that the doubly-fed asynchronous generator converts the second kinetic energy into second electrical energy of a set frequency, and outputs the second electrical energy to the grid.

[0209] In one embodiment of the present invention, the switching module is also used to: if the grid frequency is greater than an eighth set threshold, control the operating state of the doubly-fed asynchronous generator to switch to a motor state, so that the doubly-fed asynchronous generator converts the first electrical energy of the grid into first kinetic energy, and controls the flywheel rotor to store the first kinetic energy; wherein the fifth set threshold is less than or equal to the sixth set threshold.

[0210] In one embodiment of the present invention, the switching module is further used to: identify that the set standby condition is currently met according to the operating parameters and / or the grid parameters, and control the operating state of the double-fed asynchronous generator to switch to the standby state.

[0211] In one embodiment of the present invention, the operating parameters include at least one of the speed of the flywheel rotor and the speed of the doubly-fed asynchronous generator, and the grid parameters include at least one of the grid voltage, the grid power factor, and the grid frequency.

[0212] In one embodiment of the present invention, the flywheel system also includes a reactive compensation device, which is connected to a power grid. The device also includes: a control module, which is used to: detect operating parameters and / or power grid parameters of the flywheel system; identify whether the set reactive compensation conditions are currently met based on the operating parameters and / or the power grid parameters, and control the reactive compensation device or the doubly-fed asynchronous generator to perform reactive compensation on the power grid.

[0213] In one embodiment of the present invention, the control module is also used to: if the grid voltage is less than a third set threshold, and / or the grid power factor is greater than a fourth set threshold, identify that the first set reactive compensation condition is currently met, and control the reactive compensation device to output reactive power to the grid; if the grid voltage is greater than a fifth set threshold, and / or the grid power factor is less than a sixth set threshold, identify that the second set reactive compensation condition is currently met, and control the reactive compensation device to absorb reactive power from the grid; wherein the third set threshold is less than or equal to the fifth set threshold, and the sixth set threshold is less than or equal to the fourth set threshold.

[0214] In one embodiment of the present invention, the control module is also used to: if the grid voltage is greater than or equal to the third set threshold and less than the ninth set threshold, and / or the grid power factor is less than or equal to the fourth set threshold and greater than the tenth set threshold, identify that the third reactive power compensation condition is currently met, and control the doubly fed asynchronous generator to output reactive power to the grid; if the grid voltage is less than or equal to the fifth set threshold and greater than the eleventh set threshold, and / or the grid power factor is greater than or equal to the sixth set threshold and less than the twelfth set threshold, identify that the fourth reactive power compensation condition is currently met, and control the doubly fed asynchronous generator to absorb reactive power from the grid; wherein the ninth set threshold is less than or equal to the eleventh set threshold, and the twelfth set threshold is less than or equal to the tenth set threshold.

[0215] In one embodiment of the present invention, the control module is further used to: in response to a reactive compensation instruction, control the reactive compensation device or the double-fed asynchronous generator to perform reactive compensation on the power grid.

[0216] It should be noted that for details not disclosed in the control device of the flywheel system in the embodiment of the present invention, please refer to the details disclosed in the control method of the flywheel system in the embodiment of the present invention, which will not be repeated here.

[0217] In summary, the control device of the flywheel system of the embodiment of the present invention detects the rotation speed of the flywheel rotor, and adjusts the operating parameters of the generator rotor through the frequency converter according to the rotation speed of the flywheel rotor, so that the magnetic field rotation speed of the generator stator is maintained at the set rotation speed. Therefore, the operating parameters of the generator rotor can be adjusted according to the rotation speed of the flywheel rotor, so that the magnetic field rotation speed of the generator stator is maintained at the set rotation speed, which can ensure that the double-fed asynchronous generator generates electric energy of the set frequency, and then the double-fed asynchronous motor outputs electric energy of the set frequency to the power grid, which helps to improve the stability of the power grid.

[0218] In order to implement the above embodiment, Fig.13 As shown, an embodiment of the present invention proposes a flywheel system 100, including a flywheel rotor 111 and a doubly-fed asynchronous generator 30, the doubly-fed asynchronous generator including a generator stator, a generator rotor and a frequency converter 33, the flywheel rotor 111 is transmission-connected to the generator rotor, the generator rotor is connected to the power grid through the frequency converter 33, and the generator stator is connected to the power grid; and the control device 200 of the above-mentioned flywheel system.

[0219] In one embodiment, if Fig.14 As shown, the flywheel system 100 further includes an electric motor 112 , which is drivingly connected to the flywheel rotor 111 .

[0220] In one embodiment, if Fig.14 As shown, the flywheel system 100 further includes a reactive power compensation device 110 , which is connected to a power grid.

[0221] It should be noted that Fig.13 , 14 The flywheel system shown is only an example of the flywheel system in the embodiment of the present invention, and is not a limitation of the flywheel system in the embodiment of the present invention.

[0222] In summary, the flywheel system of the embodiment of the present invention detects the speed of the flywheel rotor, and adjusts the operating parameters of the generator rotor through the frequency converter according to the speed of the flywheel rotor, so that the magnetic field speed of the generator stator is maintained at the set speed. Therefore, the operating parameters of the generator rotor can be adjusted according to the speed of the flywheel rotor, so that the magnetic field speed of the generator stator is maintained at the set speed, which can ensure that the double-fed asynchronous generator generates electric energy of the set frequency, and then the double-fed asynchronous motor outputs electric energy of the set frequency to the power grid, which helps to improve the stability of the power grid.

[0223] In order to implement the above embodiment, Fig.15 As shown, an embodiment of the present invention proposes an electronic device 300, including: a memory 310, a processor 320, and a computer program stored in the memory 310 and executable on the processor 320. When the processor 320 executes the program, the above-mentioned flywheel system control method is implemented.

[0224] The electronic device of the embodiment of the present invention detects the rotation speed of the flywheel rotor by executing the computer program stored in the memory through the processor, and adjusts the operating parameters of the generator rotor through the frequency converter according to the rotation speed of the flywheel rotor, so that the magnetic field rotation speed of the generator stator is maintained at the set rotation speed. Therefore, the operating parameters of the generator rotor can be adjusted according to the rotation speed of the flywheel rotor, so that the magnetic field rotation speed of the generator stator is maintained at the set rotation speed, which can ensure that the double-fed asynchronous generator generates electric energy of the set frequency, and then the double-fed asynchronous motor outputs electric energy of the set frequency to the power grid, which helps to improve the stability of the power grid.

[0225] In order to implement the above embodiment, the embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the above flywheel system control method is implemented.

[0226] The computer-readable storage medium of the embodiment of the present invention detects the rotation speed of the flywheel rotor by storing a computer program and being executed by a processor. According to the rotation speed of the flywheel rotor, the operating parameters of the generator rotor are adjusted through the frequency converter so that the magnetic field rotation speed of the generator stator is maintained at a set rotation speed. Thus, the operating parameters of the generator rotor can be adjusted according to the rotation speed of the flywheel rotor so that the magnetic field rotation speed of the generator stator is maintained at a set rotation speed, which can ensure that the double-fed asynchronous generator generates electric energy of a set frequency, and then the double-fed asynchronous motor outputs electric energy of a set frequency to the power grid, which helps to improve the stability of the power grid.

[0227] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0228] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0229] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0230] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0231] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0232] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A control method for a flywheel system, characterized in that: The flywheel system comprises a flywheel rotor and a double-fed asynchronous generator, the double-fed asynchronous generator comprises a generator stator, a generator rotor and a frequency converter, the flywheel rotor is drivingly connected to the generator rotor, the generator rotor is connected to the power grid through the frequency converter, and the generator stator is connected to the power grid; The method comprises: detecting the rotation speed of the flywheel rotor; According to the rotation speed of the flywheel rotor, the operating parameters of the generator rotor are adjusted by the frequency converter so that the magnetic field rotation speed of the generator stator is maintained at a set rotation speed.

2. The method according to claim 1, characterized in that Also includes: Detecting operating parameters of the flywheel system and / or grid parameters; The double-fed asynchronous generator is switched within a plurality of operating states according to the operating parameters and / or the grid parameters.

3. The method according to claim 2, characterized in that The step of switching the doubly-fed asynchronous generator within a plurality of operating states according to the operating parameter and / or the grid parameter comprises: If the rotational speed of the flywheel rotor is less than a first set threshold, and / or a charging instruction of the flywheel rotor is received, the operating state of the doubly-fed asynchronous generator is controlled to switch to the motor state, so that the doubly-fed asynchronous generator converts the first electrical energy of the power grid into the first kinetic energy, and controls the flywheel rotor to store the first kinetic energy.

4. The method according to claim 2, characterized in that: The flywheel system further includes an electric motor, which is drivingly connected to the flywheel rotor. The method further includes: If the rotation speed of the flywheel rotor is less than a first set threshold, and / or a charging instruction of the flywheel rotor is received, the electric motor is controlled to convert the first electrical energy of the power grid into first kinetic energy, and the flywheel rotor is controlled to store the first kinetic energy.

5. The method according to claim 4, characterized in that The step of switching the doubly-fed asynchronous generator within a plurality of operating states according to the operating parameter and / or the grid parameter comprises: If the rotation speed of the flywheel rotor is less than a first set threshold, and / or a charging instruction of the flywheel rotor is received, the operating state of the double-fed asynchronous generator is controlled to switch to a standby state.

6. The method according to claim 3 or 4, characterized in that: The step of switching the doubly-fed asynchronous generator within a plurality of operating states according to the operating parameter and / or the grid parameter comprises: If the rotation speed of the flywheel rotor is greater than a second set threshold value, and / or a discharge instruction of the flywheel rotor is received, the flywheel rotor is controlled to release the second kinetic energy, and the operating state of the double-fed asynchronous generator is controlled to switch to the generator state, so that the double-fed asynchronous generator converts the second kinetic energy into second electrical energy of a set frequency, and outputs the second electrical energy to the power grid; The first set threshold is less than or equal to the second set threshold.

7. The method according to any one of claims 2 to 5, characterized in that: The step of switching the doubly-fed asynchronous generator within a plurality of operating states according to the operating parameter and / or the grid parameter comprises: If the grid voltage is less than a third set threshold value, and / or the grid power factor is greater than a fourth set threshold value, controlling the operating state of the double-fed asynchronous generator to switch to a first phase modulation state, so that the double-fed asynchronous generator outputs reactive power to the grid; If the grid voltage is greater than a fifth set threshold value, and / or the grid power factor is less than a sixth set threshold value, controlling the operating state of the double-fed asynchronous generator to switch to a second phase modulation state, so that the double-fed asynchronous generator absorbs reactive power from the grid; Among them, the third set threshold is less than or equal to the fifth set threshold, and the sixth set threshold is less than or equal to the fourth set threshold.

8. The method according to any one of claims 2 to 5, characterized in that: The step of switching the doubly-fed asynchronous generator within a plurality of operating states according to the operating parameter and / or the grid parameter comprises: If the grid frequency is less than a seventh set threshold, the flywheel rotor is controlled to release the second kinetic energy, and the operating state of the doubly-fed asynchronous generator is controlled to switch to a generator state, so that the doubly-fed asynchronous generator converts the second kinetic energy into second electrical energy of a set frequency and outputs the second electrical energy to the grid.

9. The method according to claim 8, characterized in that The step of switching the doubly-fed asynchronous generator within a plurality of operating states according to the operating parameter and / or the grid parameter comprises: If the grid frequency is greater than an eighth set threshold, controlling the operating state of the double-fed asynchronous generator to switch to a motor state, so that the double-fed asynchronous generator converts the first electrical energy of the grid into first kinetic energy, and controls the flywheel rotor to store the first kinetic energy; Wherein, the seventh set threshold is less than or equal to the eighth set threshold.

10. The method according to any one of claims 2 to 5, characterized in that: The step of switching the doubly-fed asynchronous generator within a plurality of operating states according to the operating parameter and / or the grid parameter comprises: According to the operating parameters and / or the grid parameters, it is identified that the set standby condition is currently met, and the operating state of the double-fed asynchronous generator is controlled to switch to the standby state.

11. The method according to any one of claims 2 to 5, characterized in that: The operating parameters include at least one of the rotational speed of the flywheel rotor and the rotational speed of the doubly-fed asynchronous generator, and the grid parameters include at least one of the grid voltage, the grid power factor, and the grid frequency.

12. The method according to any one of claims 1 to 5, characterized in that: The flywheel system further includes a reactive power compensation device, which is connected to a power grid. The method further includes: Detecting operating parameters of the flywheel system and / or grid parameters; According to the operating parameters and / or the grid parameters, it is identified that the set reactive compensation condition is currently met, and the reactive compensation device or the double-fed asynchronous generator is controlled to perform reactive compensation on the grid.

13. The method according to claim 12, characterized in that The step of identifying, according to the operating parameters and / or the grid parameters, that a set reactive compensation condition is currently satisfied, and controlling the reactive compensation device or the double-fed asynchronous generator to perform reactive compensation on the grid comprises: If the grid voltage is less than a third set threshold value, and / or the grid power factor is greater than a fourth set threshold value, identifying that the first set reactive power compensation condition is currently met, and controlling the reactive power compensation device to output reactive power to the grid; If the grid voltage is greater than a fifth set threshold value, and / or the grid power factor is less than a sixth set threshold value, identifying that a second set reactive power compensation condition is currently satisfied, and controlling the reactive power compensation device to absorb reactive power from the grid; Among them, the third set threshold is less than or equal to the fifth set threshold, and the sixth set threshold is less than or equal to the fourth set threshold.

14. The method according to claim 13, characterized in that The step of identifying, according to the operating parameters and / or the grid parameters, that a set reactive compensation condition is currently satisfied, and controlling the reactive compensation device or the double-fed asynchronous generator to perform reactive compensation on the grid comprises: If the grid voltage is greater than or equal to the third set threshold and less than the ninth set threshold, and / or the grid power factor is less than or equal to the fourth set threshold and greater than the tenth set threshold, it is identified that the third reactive power compensation condition is currently met, and the double-fed asynchronous generator is controlled to output reactive power to the grid; If the grid voltage is less than or equal to the fifth set threshold value and greater than the eleventh set threshold value, and / or the grid power factor is greater than or equal to the sixth set threshold value and less than the twelfth set threshold value, it is identified that the fourth reactive power compensation condition is currently met, and the double-fed asynchronous generator is controlled to absorb reactive power from the grid; Among them, the ninth set threshold is less than or equal to the eleventh set threshold, and the twelfth set threshold is less than or equal to the tenth set threshold.

15. The method according to claim 12, characterized in that Also includes: In response to the reactive power compensation instruction, the reactive power compensation device or the double-fed asynchronous generator is controlled to perform reactive power compensation on the power grid.

16. A control device for a flywheel system, characterized in that: The flywheel system comprises a flywheel rotor and a double-fed asynchronous generator, the double-fed asynchronous generator comprises a generator stator, a generator rotor and a frequency converter, the flywheel rotor is drivingly connected to the generator rotor, the generator rotor is connected to the power grid through the frequency converter, and the generator stator is connected to the power grid; The control device of the flywheel system comprises: A detection module, used for detecting the rotation speed of the flywheel rotor; The regulating module is used to regulate the operating parameters of the generator rotor through the frequency converter according to the rotation speed of the flywheel rotor, so as to keep the magnetic field rotation speed of the generator stator at a set rotation speed.

17. A flywheel system, characterized in that: The flywheel system comprises a flywheel rotor and a double-fed asynchronous generator, the double-fed asynchronous generator comprises a generator stator, a generator rotor and a frequency converter, the flywheel rotor is drivingly connected to the generator rotor, the generator rotor is connected to the power grid through the frequency converter, and the generator stator is connected to the power grid; And a control device for a flywheel system as claimed in claim 16.

18. The flywheel system according to claim 17, characterized in that The flywheel system also includes an electric motor, which is drivingly connected to the flywheel rotor.

19. The flywheel system according to claim 17, characterized in that The flywheel system further comprises a reactive power compensation device, which is connected to a power grid.

20. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the control method for the flywheel system according to any one of claims 1 to 15 is implemented.

21. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the control method of the flywheel system as described in any one of claims 1 to 15 is implemented.

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