Flywheel system control method and device

Abstract

The invention discloses a control method and device of a flywheel system. The method comprises the steps of detecting operation parameters and / or power grid parameters of the flywheel system; according to the rotating speed of the flywheel rotor, the operating parameters of the second rotor are adjusted through the frequency converter, so that the magnetic field rotating speed of the second rotor is kept at the set rotating speed; and according to the operation parameters and / or the power grid parameters, identifying that a set reactive power compensation condition is met currently, and controlling a reactive power compensation device to perform reactive power compensation on the power grid. Therefore, according to the rotating speed of the flywheel rotor, the operation parameters of the second rotor can be adjusted so that the magnetic field rotating speed of the second rotor can be kept at the set rotating speed, the operation parameters and / or the power grid parameters of the flywheel system can be comprehensively considered to identify the current condition meeting the set reactive compensation condition, and then the reactive compensation device is controlled to carry out reactive compensation on the power grid. The stability of a power grid is improved, and normal operation of a flywheel system is guaranteed.

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 grid stability and low flywheel operation reliability. 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 second rotor according to the rotational speed of the flywheel rotor so that the magnetic field rotational speed of the second rotor is maintained at a set rotational speed, and the rotational speed of the first rotor is maintained at a set rotational speed, thereby driving the phase shifter to generate electric energy of a set frequency to output electric energy of a set frequency to the power grid, which helps to improve the stability of the flywheel system's power generation, and can also comprehensively consider the operating parameters of the flywheel system and / or the power grid parameters to identify the current conditions that meet the set reactive compensation conditions, and then control the reactive compensation device to perform reactive compensation on the power grid, which helps to improve the stability of the power grid and ensure the normal operation of the flywheel system.

[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, an electromagnetic coupler, a phase regulator and a reactive power compensation device, wherein the electromagnetic coupler includes a first rotor, a second rotor and a frequency converter, wherein the flywheel rotor is transmission-connected to the second rotor, the second rotor is connected to the frequency converter, the frequency converter is not connected to a power grid, the first rotor is transmission-connected to the phase regulator, the phase regulator and the reactive power compensation device are respectively connected to the power grid, and the speed of the first rotor is maintained at a set speed;

[0010] The method includes: detecting the operating parameters and / or grid parameters of the flywheel system; adjusting the operating parameters of the second rotor through the frequency converter according to the rotational speed of the flywheel rotor so that the magnetic field rotational speed of the second rotor is maintained at the set rotational speed; identifying that the set reactive power compensation conditions are currently met according to the operating parameters and / or the grid parameters, and controlling the reactive power compensation device to perform reactive power compensation on the grid.

[0011] According to the control method of the flywheel system of the embodiment of the present invention, the operating parameters of the second rotor can be adjusted according to the rotational speed of the flywheel rotor to keep the magnetic field rotational speed of the second rotor at a set rotational speed, so that the rotational speed of the first rotor is kept at a set rotational speed, and then the phase shifter can be driven to generate electric energy of a set frequency to output electric energy of a set frequency to the power grid, which helps to improve the stability of the flywheel system's power generation. It can also comprehensively consider the operating parameters of the flywheel system and / or the power grid parameters to identify the current conditions that meet the set reactive compensation conditions, and then control the reactive compensation device to perform reactive compensation on the power grid, which helps to improve the stability of the power grid and ensure the normal operation of the flywheel system.

[0012] 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:

[0013] 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 to perform reactive compensation on the grid, includes: if the grid voltage is less than a first set threshold, and / or the grid power factor is greater than a second 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 third set threshold, and / or the grid power factor is less than a fourth 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 first set threshold is less than or equal to the third set threshold, and the fourth set threshold is less than or equal to the second set threshold.

[0014] 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 to perform reactive power compensation on the power grid.

[0015] In one embodiment of the present invention, the flywheel system also includes a speed changing device, and the flywheel rotor is transmission-connected to the second rotor via the speed changing device. The method also includes: configuring a speed ratio of the speed changing device according to the rotational speed of the flywheel rotor so that the rotational speed of the second rotor is maintained within a set range.

[0016] In one embodiment of the present invention, it further includes: switching the phase modulator within a plurality of operating states according to the operating parameter and / or the grid parameter.

[0017] In one embodiment of the present invention, the phase regulator is switched within multiple operating states according to the operating parameters and / or the grid parameters, including: if the rotational speed of the flywheel rotor is less than a fifth set threshold, and / or a charging instruction of the flywheel rotor is received, the operating state of the phase regulator is controlled to switch to a motor state, so that the phase regulator converts the first electrical energy of the grid into first kinetic energy, and controls the flywheel rotor to store the first kinetic energy.

[0018] 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 fifth 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.

[0019] In one embodiment of the present invention, the state of the phase regulator is switched within multiple operating states according to the operating parameters and / or the grid parameters, including: if the rotational speed of the flywheel rotor is less than the fifth set threshold, and / or a charging instruction of the flywheel rotor is received, controlling the operating state of the phase regulator to switch to a standby state.

[0020] In one embodiment of the present invention, the phase modulator is switched within multiple operating states according to the operating parameters and / or the grid parameters, including: if the rotational speed of the flywheel rotor is greater than a sixth 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 phase modulator is controlled to switch to a generator state, so that the phase modulator converts the second kinetic energy into second electrical energy of a set frequency, and outputs the second electrical energy to the grid; wherein the fifth set threshold is less than or equal to the sixth set threshold.

[0021] In one embodiment of the present invention, the state switching of the phase modulator 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 first set threshold, and / or the grid power factor is greater than a second set threshold, the operating state of the phase modulator is controlled to switch to a first phase adjustment state, so that the phase modulator outputs reactive power to the grid; if the grid voltage is greater than a third set threshold, and / or the grid power factor is less than a fourth set threshold, the operating state of the phase modulator is controlled to switch to a second phase adjustment state, so that the phase modulator absorbs reactive power from the grid; wherein the first set threshold is less than or equal to the third set threshold, and the fourth set threshold is less than or equal to the second set threshold.

[0022] In one embodiment of the present invention, the phase modulator is switched within multiple operating states 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 phase modulator to switch to a generator state, so that the phase modulator converts the second kinetic energy into second electrical energy of a set frequency, and outputs the second electrical energy to the grid.

[0023] In one embodiment of the present invention, the state switching of the phase modulator 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 phase modulator to switch to a motor state, so that the phase modulator 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.

[0024] In one embodiment of the present invention, the state switching of the phase modulator 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 phase modulator to switch to the standby state.

[0025] In one embodiment of the present invention, the operating parameters include at least one of the rotational speed of the flywheel rotor and the rotational speed of the phase regulator, and the grid parameters include at least one of the grid voltage, the grid power factor and the grid frequency.

[0026] In one embodiment of the present invention, the first rotor is an outer rotor and the second rotor is an inner rotor, or the first rotor is an inner rotor and the second rotor is an outer rotor.

[0027] A second aspect of the present invention provides a control device for a flywheel system, wherein the flywheel system includes a flywheel rotor, an electromagnetic coupler, a phase regulator and a reactive power compensation device, wherein the electromagnetic coupler includes a first rotor, a second rotor and a frequency converter, wherein the flywheel rotor is transmission-connected to the second rotor, the second rotor is connected to the frequency converter, the frequency converter is not connected to a power grid, the first rotor is transmission-connected to the phase regulator, the phase regulator and the reactive power compensation device are respectively connected to the power grid, and the speed of the first rotor is maintained at a set speed;

[0028] The control device of the flywheel system includes: a detection module, which is used to detect the operating parameters and / or grid parameters of the flywheel system; a regulation module, which is used to adjust the operating parameters of the second rotor through the inverter according to the rotational speed of the flywheel rotor, so that the magnetic field speed of the second rotor is maintained at the set rotational speed; and a control module, which is used to identify that the set reactive compensation conditions are currently met according to the operating parameters and / or the grid parameters, and control the reactive compensation device to perform reactive compensation on the grid.

[0029] The control device of the flywheel system of the embodiment of the present invention can adjust the operating parameters of the second rotor according to the rotational speed of the flywheel rotor so that the magnetic field rotational speed of the second rotor is maintained at a set rotational speed, and the rotational speed of the first rotor is maintained at a set rotational speed, thereby driving the phase shifter to generate electric energy of a set frequency to output electric energy of a set frequency to the power grid, which helps to improve the stability of the flywheel system's power generation. It can also comprehensively consider the operating parameters of the flywheel system and / or the power grid parameters to identify whether the set reactive compensation conditions are currently met, and then control the reactive compensation device to perform reactive compensation on the power grid, which helps to improve the stability of the power grid and ensure the normal operation of the flywheel system.

[0030] 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:

[0031] In one embodiment of the present invention, the control module is also used to: if the grid voltage is less than a first set threshold value, and / or the grid power factor is greater than a second set threshold value, identify that the current set first reactive compensation condition is met, and control the reactive compensation device to output reactive power to the grid; if the grid voltage is greater than a third set threshold value, and / or the grid power factor is less than a fourth set threshold value, identify that the current set second reactive compensation condition is met, and control the reactive compensation device to absorb reactive power from the grid; wherein the first set threshold value is less than or equal to the third set threshold value, and the fourth set threshold value is less than or equal to the second set threshold value.

[0032] In one embodiment of the present invention, the control module is further used to: in response to a reactive power compensation instruction, control the reactive power compensation device to perform reactive power compensation on the power grid.

[0033] In one embodiment of the present invention, the flywheel system also includes a speed changing device, and the flywheel rotor is transmission-connected to the second rotor via the speed changing device. The control device of the flywheel system also includes: a configuration module, and the configuration module is used to: configure the speed ratio of the speed changing device according to the rotational speed of the flywheel rotor so that the rotational speed of the second rotor is maintained within a set range.

[0034] In one embodiment of the present invention, the control device of the flywheel system further includes: a switching module, wherein the switching module is used to switch the state of the phase regulator within multiple operating states according to the operating parameters and / or the grid parameters.

[0035] 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 fifth set threshold value, and / or a charging instruction of the flywheel rotor is received, control the operating state of the phase regulator to switch to the motor state, so that the phase regulator 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.

[0036] In one embodiment of the present invention, the flywheel system also includes an electric motor, which is transmission-connected to the flywheel rotor. The control module is also used to: if the rotational speed of the flywheel rotor is less than a fifth 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.

[0037] In one embodiment of the present invention, the switching module is further used to: if the rotation speed of the flywheel rotor is less than the fifth set threshold, and / or a charging instruction of the flywheel rotor is received, control the operating state of the phase regulator to switch to a standby state.

[0038] 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 sixth 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 phase regulator to switch to a generator state, so that the phase regulator 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 fifth set threshold value is less than or equal to the sixth set threshold value.

[0039] In one embodiment of the present invention, the switching module is also used to: if the grid voltage is less than a first set threshold value, and / or the grid power factor is greater than a second set threshold value, control the operating state of the phase modulator to switch to a first phase adjustment state so that the phase modulator outputs reactive power to the grid; if the grid voltage is greater than a third set threshold value, and / or the grid power factor is less than a fourth set threshold value, control the operating state of the phase modulator to switch to a second phase adjustment state so that the phase modulator absorbs reactive power from the grid; wherein the first set threshold value is less than or equal to the third set threshold value, and the fourth set threshold value is less than or equal to the second set threshold value.

[0040] 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 phase regulator to switch to a generator state, so that the phase regulator converts the second kinetic energy into second electrical energy of a set frequency, and outputs the second electrical energy to the grid.

[0041] 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 phase regulator to switch to a motor state, so that the phase regulator 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.

[0042] 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 phase regulator to switch to the standby state.

[0043] In one embodiment of the present invention, the operating parameters include at least one of the rotational speed of the flywheel rotor and the rotational speed of the phase regulator, and the grid parameters include at least one of the grid voltage, the grid power factor and the grid frequency.

[0044] In one embodiment of the present invention, the first rotor is an outer rotor and the second rotor is an inner rotor, or the first rotor is an inner rotor and the second rotor is an outer rotor.

[0045] The third aspect of the present invention provides a flywheel system, which includes a flywheel rotor, an electromagnetic coupler, a phase regulator and a reactive compensation device, the electromagnetic coupler includes a first rotor, a second rotor and a frequency converter, the flywheel rotor is transmission-connected to the second rotor, the second rotor is connected to the frequency converter, the frequency converter is not connected to the power grid, the first rotor is transmission-connected to the phase regulator, the phase regulator and the reactive compensation device are respectively connected to the power grid, and the speed of the first rotor is maintained at a set speed; and the control device of the flywheel system described in the second aspect of the present invention.

[0046] In one embodiment of the present invention, the flywheel system further comprises a speed changing device, and the flywheel rotor is drivingly connected to the second rotor via the speed changing device.

[0047] In one embodiment of the present invention, the flywheel system further comprises an electric motor, which is drivingly connected to the flywheel rotor.

[0048] In one embodiment of the present invention, the first rotor is an outer rotor and the second rotor is an inner rotor, or the first rotor is an inner rotor and the second rotor is an outer rotor.

[0049] The flywheel system of the embodiment of the present invention can adjust the operating parameters of the second rotor according to the rotational speed of the flywheel rotor so that the magnetic field rotational speed of the second rotor is maintained at a set rotational speed, and the rotational speed of the first rotor is maintained at a set rotational speed, thereby driving the phase shifter to generate electric energy of a set frequency to output electric energy of a set frequency to the power grid, which helps to improve the stability of the flywheel system's power generation. It can also comprehensively consider the operating parameters of the flywheel system and / or the power grid parameters to identify whether the set reactive compensation conditions are currently met, and then control the reactive compensation device to perform reactive compensation on the power grid, which helps to improve the stability of the power grid and ensure the normal operation of the flywheel system.

[0050] 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.

[0051] The electronic device of the embodiment of the present invention can adjust the operating parameters of the second rotor according to the rotational speed of the flywheel rotor through the processor executing the computer program stored in the memory, so that the magnetic field rotational speed of the second rotor is maintained at the set rotational speed, and the rotational speed of the first rotor is maintained at the set rotational speed, thereby driving the phase regulator to generate electric energy of the set frequency to output electric energy of the set frequency to the power grid, which helps to improve the stability of the flywheel system's power generation. It can also comprehensively consider the operating parameters of the flywheel system and / or the power grid parameters to identify the current conditions that meet the set reactive compensation conditions, and then control the reactive compensation device to perform reactive compensation on the power grid, which helps to improve the stability of the power grid and ensure the normal operation of the flywheel system.

[0052] 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.

[0053] The computer-readable storage medium of the embodiment of the present invention can adjust the operating parameters of the second rotor according to the rotational speed of the flywheel rotor by storing a computer program and being executed by a processor, so that the magnetic field rotational speed of the second rotor is maintained at a set rotational speed, and the rotational speed of the first rotor is maintained at a set rotational speed, thereby driving the phase shifter to generate electric energy of a set frequency to output electric energy of a set frequency to the power grid, which helps to improve the stability of the flywheel system's power generation, and can also comprehensively consider the operating parameters of the flywheel system and / or the power grid parameters to identify the current conditions for satisfying the set reactive compensation, and then control the reactive compensation device to perform reactive compensation on the power grid, which helps to improve the stability of the power grid and ensure the normal operation of the flywheel system.

[0054] 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

[0055] 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:

[0056] Figure 1 A schematic diagram of the structure of a flywheel system according to an embodiment of the present invention;

[0057] Figure 2 is a schematic structural diagram of a flywheel system according to another embodiment of the present invention;

[0058] Figure 3 A schematic flow chart of a control method for a flywheel system according to an embodiment of the present invention;

[0059] Figure 4is a flow chart of a control method of a flywheel system according to another embodiment of the present invention;

[0060] Figure 5 is a flow chart of a control method of a flywheel system according to another embodiment of the present invention;

[0061] Figure 6 is a flow chart of a control method of a flywheel system according to another embodiment of the present invention;

[0062] Figure 7 is a flow chart of a control method of a flywheel system according to another embodiment of the present invention;

[0063] Figure 8 is a flow chart of a control method of a flywheel system according to another embodiment of the present invention;

[0064] Fig. 9 is a flow chart of a control method of a flywheel system according to another embodiment of the present invention;

[0065] Fig.10 is a schematic structural diagram of a flywheel system according to another embodiment of the present invention;

[0066] Fig.11 is a schematic structural diagram of a flywheel system according to another embodiment of the present invention;

[0067] Fig.12 is a schematic structural diagram of a flywheel system according to another embodiment of the present invention;

[0068] Fig.13 is a schematic structural diagram of a flywheel system according to another embodiment of the present invention;

[0069] Fig.14 is a schematic structural diagram of a control device for a flywheel system according to an embodiment of the present invention;

[0070] Fig.15 is a schematic structural diagram of a flywheel system according to another embodiment of the present invention;

[0071] Fig.16 is a schematic structural diagram of a flywheel system according to another embodiment of the present invention;

[0072] Fig.17 FIG. 1 is a schematic structural diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0073] 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.

[0074] 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.

[0075] The flywheel system of the embodiment of the present invention includes a flywheel rotor, an electromagnetic coupler, a phase regulator and a reactive compensation device. The electromagnetic coupler includes a first rotor, a second rotor and a frequency converter. The flywheel rotor is transmission-connected to the second rotor, the second rotor is connected to the frequency converter, the frequency converter is not connected to the power grid, the first rotor is transmission-connected to the phase regulator, the phase regulator and the reactive compensation device are respectively connected to the power grid, and the speed of the first rotor is maintained at a set speed.

[0076] In one embodiment, the first rotor is an outer rotor and the second rotor is an inner rotor, or the first rotor is an inner rotor and the second rotor is an outer rotor. The outer rotor is sleeved with the inner rotor.

[0077] It should be noted that the flywheel system of the embodiment of the present invention is described below by taking the first rotor as an outer rotor and the second rotor as an inner rotor as an example.

[0078] Figure 1 Schematic diagram of the structure of a flywheel system according to an embodiment of the present invention.

[0079] like Figure 1 As shown, the flywheel system 100 of the embodiment of the present invention includes a flywheel rotor 111, an electromagnetic coupler 120, a phase condenser 30 and a reactive power compensation device 110. The electromagnetic coupler 120 includes an outer rotor 1, an inner rotor 2 and a frequency converter 3. The flywheel rotor 111 is connected to the inner rotor 2 in a transmission manner. The inner rotor 2 is connected to the frequency converter 3. The frequency converter 3 is not connected to the power grid. The outer rotor 1 is connected to the phase condenser 30 in a transmission manner. The phase condenser 30 and the reactive power compensation device 110 are connected to the power grid respectively. The speed of the outer rotor 1 is maintained at a set speed.

[0080] In one embodiment, if Figure 1 As shown, the flywheel rotor 111 is connected to the inner rotor 2 via a transmission shaft 41, and the outer rotor 1 is connected to the phase regulator 30 via a transmission shaft 42. It can be understood that the transmission shaft 41 is the input shaft of the electromagnetic coupler 120, and the transmission shaft 42 is the output shaft of the electromagnetic coupler 120.

[0081] It should be noted that no excessive limitations are imposed on the electromagnetic coupler 120 , the phase regulator 30 , and the reactive power compensation device 110 .

[0082] It should be noted that the transmission ratio of the electromagnetic coupler 120 is the ratio of the mechanical speed of the inner rotor 2 to the mechanical speed of the outer rotor 1. The mechanical speed of the inner rotor 2 is equal to the speed of the flywheel rotor 111, and the mechanical speed of the outer rotor 1 is maintained at the set speed, that is, the transmission ratio of the electromagnetic coupler 120 is adjustable.

[0083] 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.

[0084] It should be noted that there are no excessive restrictions on the set speed. For example, the set speed is 3000 rpm (revolutions per minute).

[0085] In one embodiment, Figure 2 As shown, the flywheel system 100 of the embodiment of the present invention further includes a speed change device 20 , and the flywheel rotor 111 is transmission-connected to the inner rotor 2 via the speed change device 20 .

[0086] In one embodiment, Figure 2 As shown, the flywheel rotor 111 is connected to the speed change device 20 via a transmission shaft 41, and the speed change device 20 is connected to the phase regulator 30 via a transmission shaft 43. It can be understood that the transmission shaft 41 is the input shaft of the speed change device 20, and the transmission shaft 43 is the output shaft of the speed change device 20.

[0087] It should be noted that the speed change device 20 is not excessively limited.

[0088] In one embodiment, the transmission ratio of the transmission device 20 may be a fixed value, or the transmission ratio may be adjustable.

[0089] In one embodiment, the speed transmission device 20 includes but is not limited to a continuously variable speed transmission device, a permanent magnet speed transmission device, a hydraulic speed transmission device, a magnetorheological fluid device, a gear transmission speed transmission device, a magnetic coupling speed transmission device, a speed transmission device with adjustable speed difference, and a doubly fed asynchronous adjustable speed transmission device.

[0090] In one embodiment, 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 .

[0091] In one embodiment, Figure 2 As shown, the electric motor 112 is connected to the flywheel rotor 111 via a transmission shaft 41 .

[0092] It should be noted that Figure 1 , 2The flywheel system shown is only an example of the flywheel system of the embodiment of the present invention, and is not a limitation of the flywheel system of the embodiment of the present invention. Figure 1 , 2 The flywheel system shown will not be described in detail here.

[0093] 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.

[0094] like Figure 3 As shown, the control method of the flywheel system of the embodiment of the present invention includes:

[0095] S301, detecting operating parameters of a 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 and the speed of the phase regulator, 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 phase regulator can be detected by a speed sensor. For example, the speed sensors can be respectively arranged on the flywheel rotor and the phase regulator.

[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 based on the ratio of active power to reactive power in the grid power. For example, the phase regulator 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 transmission lines, transformers, etc.

[0100] S302, adjusting the operating parameters of the second rotor through the frequency converter according to the rotation speed of the flywheel rotor, so that the magnetic field rotation speed of the second rotor is maintained at a set rotation speed.

[0101] In an embodiment of the present disclosure, the operating parameters of the flywheel system include the rotational speed of the flywheel rotor.

[0102] It should be noted that the "magnetic field speed of the second rotor" is not the mechanical rotation speed. The magnetic field speed of the second rotor is equal to the speed of the first rotor. The magnetic field speed of the second rotor is maintained at the set speed, so that the speed of the first rotor is maintained at the set speed, so that the phase regulator generates electric energy of the set frequency, and then the phase regulator 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).

[0103] It should be noted that the magnetic field speed of the second rotor = the speed of the second rotor + the magnetic field speed matched by the operating parameters of the second rotor. Among them, the speed of the second rotor is equal to the speed of the flywheel rotor. There are no excessive restrictions on the operating parameters of the second rotor. For example, the operating parameters of the second rotor include but are not limited to the frequency, voltage, amplitude, phase, etc. of the second rotor. For example, taking the operating parameter of the second rotor as the current frequency of the second rotor as an example, the magnetic field speed of the second rotor = the speed of the second rotor + the magnetic field speed matched by the current frequency of the second rotor.

[0104] In one embodiment, the operating parameters of the second 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 second rotor according to the magnetic field rotational speed of the second rotor and the rotational speed of the flywheel rotor, determining a target value of the operating parameters of the second rotor according to the magnetic field rotational speed that matches the operating parameters of the second rotor, and adjusting the operating parameters of the second rotor by a frequency converter based on the target value of the operating parameters of the second rotor.

[0105] In one embodiment, determining the magnetic field speed that matches the operating parameters of the second rotor based on the magnetic field speed of the second rotor and the speed of the flywheel rotor may include obtaining the difference between the magnetic field speed of the second rotor and the speed of the second rotor, and determining the difference as the magnetic field speed that matches the operating parameters of the second rotor.

[0106] In one embodiment, the magnetic field speed matched by the operating parameter of the second rotor and the target value of the operating parameter of the second rotor are in a preset corresponding relationship. For example, the electromagnetic coupler can be calibrated to establish a corresponding relationship between the magnetic field speed matched by the operating parameter of the second rotor and the target value of the operating parameter of the second rotor. For example, taking the operating parameter of the second rotor as the current frequency of the second rotor as an example, a corresponding relationship between the magnetic field speed matched by the current frequency of the second rotor and the target value of the current frequency of the second rotor can be established.

[0107] In one embodiment, determining the target value of the operating parameter of the second rotor based on the magnetic field speed that matches the operating parameter of the second rotor can include using the magnetic field speed that matches the operating parameter of the second 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 second rotor.

[0108] In one embodiment, based on the target value of the operating parameter of the second rotor, adjusting the operating parameter of the second rotor through the frequency converter may include adjusting the value of the operating parameter of the second rotor to the target value through the frequency converter, and / or, based on the target value of the operating parameter of the second rotor, determining the adjustment method of the operating parameter of the second rotor, and adjusting the operating parameter of the second 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.

[0109] S303, identifying that the set reactive power compensation conditions are currently met according to the operating parameters and / or the grid parameters, and controlling the reactive power compensation device to perform reactive power compensation on the grid.

[0110] It should be noted that there are no excessive restrictions on setting reactive power compensation conditions.

[0111] 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 is controlled to perform reactive compensation on the grid, including if the grid voltage is less than a first set threshold, and / or the grid power factor is greater than a second 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, and controlling the reactive compensation device to output reactive power to the grid, thereby increasing the grid voltage, and / or reducing the grid power factor.

[0112] If the grid voltage is greater than the third set threshold, and / or the grid power factor is less than the fourth 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.

[0113] It should be noted that the first set threshold is less than or equal to the third set threshold, and the fourth set threshold is less than or equal to the second set threshold. There are no excessive restrictions on the first to fourth set thresholds. For example, the first set threshold is the lowest voltage allowed by the power grid, the second set threshold is the highest power factor allowed by the power grid, the third set threshold is the highest voltage allowed by the power grid, and the fourth set threshold is the lowest power factor allowed by the power grid.

[0114] In one implementation, the reactive power compensation device may be controlled to perform reactive power compensation on the power grid in response to a reactive power compensation instruction.

[0115] 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.

[0116] It should be noted that there is no excessive limitation on the execution order of steps S302 and S303. For example, steps S302 and S303 may be executed serially or in parallel.

[0117] In summary, according to the control method of the flywheel system of the embodiment of the present invention, the operating parameters of the second rotor can be adjusted according to the rotational speed of the flywheel rotor, so that the magnetic field rotational speed of the second rotor is maintained at the set rotational speed, and the rotational speed of the first rotor is maintained at the set rotational speed, and then the phase regulator can be driven to generate electric energy of the set frequency to output electric energy of the set frequency to the power grid, which helps to improve the stability of the flywheel system's power generation, and can also comprehensively consider the operating parameters of the flywheel system and / or the power grid parameters to identify the current conditions that meet the set reactive compensation, and then control the reactive compensation device to perform reactive compensation on the power grid, which helps to improve the stability of the power grid and ensure the normal operation of the flywheel system.

[0118] 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 a speed change device, and the flywheel rotor is drivingly connected to the second rotor through the speed change device.

[0119] Figure 4 The figure is a flow chart of a control method of a flywheel system according to another embodiment of the present invention.

[0120] like Figure 4 As shown, the control method of the flywheel system of the embodiment of the present invention includes:

[0121] S401, detecting operating parameters of the flywheel system and / or grid parameters.

[0122] It should be noted that the relevant contents of step S401 can be found in the above embodiment and will not be described again here.

[0123] S402, configuring the speed ratio of the transmission device according to the rotation speed of the flywheel rotor so that the rotation speed of the second rotor is maintained within a set range.

[0124] It should be noted that the speed change device includes an input end and an output end, the flywheel rotor is transmission-connected to the input end, and the output end is transmission-connected to the second rotor. The input speed of the speed change device is the speed of the flywheel rotor, and the output speed of the speed change device is the speed of the second rotor, that is, the speed ratio of the speed change device is equal to the ratio between the speed of the flywheel rotor and the speed of the second rotor.

[0125] It should be noted that there are no excessive restrictions on the speed ratio and the setting range. For example, the speed ratio can be any value from 0.03 to 333, and the setting range can be (2000 rpm, 4000 rpm).

[0126] In one embodiment, configuring the speed ratio of the speed change device according to the speed of the flywheel rotor may include determining a target speed ratio of the speed change device according to the speed of the flywheel rotor and a set interval, and configuring the speed ratio of the speed change device to be the target speed ratio. It is understood that when the speed ratio of the speed change device is the target speed ratio, the speed of the second rotor can be maintained within the set interval.

[0127] For example, when the speed of the flywheel rotor is 1000 rpm and the setting interval is (2000 rpm, 4000 rpm), the target speed ratio can be any value between 0.25 and 0.5. For example, the target speed ratio can be 0.3 or 0.4.

[0128] In one embodiment, configuring the speed ratio of the transmission device according to the rotation speed of the flywheel rotor may include selecting a target speed ratio from a plurality of candidate speed ratios of the transmission device according to the rotation speed of the flywheel rotor, and configuring the speed ratio of the transmission device as the target speed ratio. It is understandable that a plurality of candidate speed ratios may be pre-configured for the transmission device.

[0129] For example, when the speed of the flywheel rotor is 1000rpm and the setting interval is (2000rpm, 4000rpm), it can be seen that the target speed ratio can be any value between 0.25 and 0.5. If the candidate speed ratios include 0.1, 0.3, 0.8, and 1, the target speed ratio of 0.3 can be selected from the candidate speed ratios.

[0130] In summary, according to the control method of the flywheel system in an embodiment of the present invention, the speed ratio of the speed change device can be configured according to the rotational speed of the flywheel rotor so that the rotational speed of the second rotor is maintained within a set range, thereby avoiding the rotational speed of the second rotor being too high or too low, and ensuring the normal operation of the flywheel system.

[0131] Figure 5 The figure is a flow chart of a control method of a flywheel system according to another embodiment of the present invention.

[0132] like Figure 5 As shown, the control method of the flywheel system of the embodiment of the present invention includes:

[0133] S501, detecting operating parameters of a flywheel system and / or grid parameters.

[0134] 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.

[0135] S502, switching the state of the phase regulator within a plurality of operating states according to the operating parameters and / or the grid parameters.

[0136] It should be noted that in the embodiments of the present invention, the phase regulator 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.

[0137] Among them, when the operating state of the phase modulator is the phase modulation state, the phase modulator outputs reactive power to the power grid or absorbs reactive power from the power grid.

[0138] When the operating state of the phase regulator is the motor state, the phase regulator converts the first electric energy of the power grid into the first kinetic energy, that is, the phase regulator absorbs electric energy from the power grid at this time.

[0139] Among them, when the operating state of the phase regulator is the generator state, the phase regulator 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 phase regulator 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 50Hz (Hertz). It can be understood that the speed of the first rotor is maintained at the set speed, and then the phase regulator can be driven to generate the second electric energy of the set frequency.

[0140] Among them, when the operating state of the phase regulator is standby state, the phase regulator 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.

[0141] In one embodiment, the state switching of the phase regulator 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 phase regulator to switch to the target operating state. It should be noted that the switching condition is not too limited. It is understandable that different operating states may correspond to different switching conditions.

[0142] 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.

[0143] 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 phase regulator 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 phase regulator within multiple operating states can be performed, which helps to improve the switching accuracy and flexibility of the operating state of the phase regulator and ensure the normal operation of the flywheel system.

[0144] Based on any of the above embodiments, the operating parameters of the flywheel system include the rotational speed of the flywheel rotor.

[0145] Figure 6 The figure is a flow chart of a control method of a flywheel system according to another embodiment of the present invention.

[0146] like Figure 6 As shown, the control method of the flywheel system of the embodiment of the present invention includes:

[0147] S601, detecting operating parameters of the flywheel system and / or grid parameters.

[0148] It should be noted that the relevant content of step S601 can be found in the above embodiment and will not be repeated here.

[0149] S602, if the rotation speed of the flywheel rotor is less than the fifth set threshold, and / or a charging instruction of the flywheel rotor is received, the operating state of the phase regulator is controlled to switch to the motor state, so that the phase regulator 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.

[0150] In an embodiment of the present invention, if the speed of the flywheel rotor is less than the fifth 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 phase regulator can be controlled to switch to the motor state, so that the phase regulator 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 phase regulator can drive the speed of the flywheel rotor to increase through the electromagnetic coupler, that is, controlling the flywheel rotor to store the first kinetic energy can be achieved by increasing the speed of the flywheel rotor.

[0151] It should be noted that there are no excessive restrictions on the fifth set threshold value. For example, the fifth set threshold value is the minimum rotation speed allowed by the flywheel rotor, and the fifth set threshold value is 100 rpm.

[0152] It should be noted that the relevant contents of the charging instruction can be found in the above embodiments and will not be described again here.

[0153] S603, if the rotation speed of the flywheel rotor is greater than the sixth 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 phase regulator is controlled to switch to the generator state, so that the phase regulator converts the second kinetic energy into the second electrical energy of the set frequency and outputs the second electrical energy to the power grid.

[0154] It should be noted that the fifth set threshold is less than or equal to the sixth set threshold.

[0155] In an embodiment of the present invention, if the speed of the flywheel rotor is greater than the sixth 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 phase regulator can be controlled to switch to the generator state, so that the phase regulator 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 phase regulator to generate the second electrical energy of the set frequency through the electromagnetic coupler.

[0156] It should be noted that there are no excessive restrictions on the sixth set threshold. For example, the sixth set threshold is the maximum rotation speed allowed by the flywheel rotor, and the sixth set threshold is 1000000 rpm.

[0157] 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.

[0158] 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 phase regulator 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 phase regulator to switch to the generator state to adjust the speed of the flywheel rotor. This 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.

[0159] 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.

[0160] Figure 7 The figure is a flow chart of a control method of a flywheel system according to another embodiment of the present invention.

[0161] like Figure 7 As shown, the control method of the flywheel system of the embodiment of the present invention includes:

[0162] S701, detecting operating parameters of the flywheel system and / or grid parameters.

[0163] It should be noted that the relevant content of step S701 can be found in the above embodiment and will not be repeated here.

[0164] S702: If the rotation speed of the flywheel rotor is less than a fifth 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.

[0165] In an embodiment of the present invention, if the speed of the flywheel rotor is less than the fifth 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 fifth set threshold and the charging instruction can be referred to the above embodiment, and will not be repeated here.

[0166] In one embodiment, the state of the phase regulator is switched within multiple operating states according to operating parameters and / or grid parameters, which may include controlling the operating state of the phase regulator to switch to a standby state if the rotational speed of the flywheel rotor is less than a fifth set threshold and / or a charging instruction of the flywheel rotor is received.

[0167] S703, if the rotation speed of the flywheel rotor is greater than the sixth 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 phase regulator is controlled to switch to the generator state, so that the phase regulator converts the second kinetic energy into the second electrical energy of the set frequency and outputs the second electrical energy to the power grid.

[0168] It should be noted that the relevant content of step S703 can be found in the above embodiment and will not be repeated here.

[0169] 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 phase regulator 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.

[0170] Based on any of the above embodiments, the grid parameters include grid voltage and grid power factor.

[0171] Figure 8 The figure is a flow chart of a control method of a flywheel system according to another embodiment of the present invention.

[0172] like Figure 8 As shown, the control method of the flywheel system of the embodiment of the present invention includes:

[0173] S801, detecting operating parameters of the flywheel system and / or grid parameters.

[0174] It should be noted that the relevant contents of step S801 can be found in the above embodiment and will not be repeated here.

[0175] S802: If the grid voltage is less than a first set threshold value, and / or the grid power factor is greater than a second set threshold value, the operating state of the phase regulator is controlled to switch to a first phase adjustment state so that the phase regulator outputs reactive power to the grid.

[0176] In an embodiment of the present invention, if the grid voltage is less than a first set threshold value, and / or the grid power factor is greater than a second set threshold value, indicating that the grid voltage is low, and / or the grid power factor is high, the operating state of the phase-shifting device can be controlled to switch to the first phase-shifting state, so that the phase-shifting device outputs reactive power to the grid, thereby increasing the grid voltage, and / or reducing the grid power factor. Thus, when the grid voltage is less than the first set threshold value, and / or the grid power factor is greater than the second set threshold value, the reactive power compensation device can be controlled to output reactive power to the grid, and the operating state of the phase-shifting device can be controlled to switch to the first phase-shifting state, so that the phase-shifting device outputs reactive power to the grid, which can further improve the reactive power compensation effect.

[0177] In one embodiment, controlling the operating state of the phase regulator to switch to the first phase modulation state may include increasing the excitation current of the phase regulator so that the phase regulator is in an overexcitation state, so that the phase regulator outputs reactive power to the power grid.

[0178] S803: If the grid voltage is greater than a third set threshold value, and / or the grid power factor is less than a fourth set threshold value, control the operating state of the phase regulator to switch to a second phase modulation state so that the phase regulator absorbs reactive power from the grid.

[0179] In an embodiment of the present invention, if the grid voltage is greater than the third set threshold value, and / or the grid power factor is less than the fourth set threshold value, indicating that the grid voltage is high and / or the grid power factor is low, the operating state of the phase-shifting device can be controlled to switch to the second phase-shifting state, so that the phase-shifting device absorbs reactive power from the grid, thereby reducing the grid voltage and / or improving the grid power factor. Thus, when the grid voltage is greater than the third set threshold value, and / or the grid power factor is less than the fourth set threshold value, the reactive power compensation device can be controlled to absorb reactive power from the grid, and the operating state of the phase-shifting device can be controlled to switch to the second phase-shifting state, so that the phase-shifting device absorbs reactive power from the grid, which can further improve the reactive power compensation effect.

[0180] In one embodiment, controlling the operating state of the phase regulator to switch to the second phase regulation state may include reducing the excitation current of the phase regulator so that the phase regulator is in an under-excitation state, so that the phase regulator absorbs reactive power from the power grid.

[0181] It should be noted that the relevant contents of the first to fourth set thresholds can be found in the above embodiments and will not be repeated here.

[0182] In summary, according to the control method of the flywheel system of the embodiment of the present invention, the grid voltage and / or the grid power factor can be comprehensively considered, and the operating state of the phase regulator can be controlled to switch to the first phase modulation state or the second phase modulation state to adjust the grid voltage and / or the grid power factor, which can effectively avoid the grid voltage and / or the grid power factor being too low or too high, so that the grid voltage and / or the grid power factor are kept within a reasonable range, thereby ensuring the normal operation of the flywheel system.

[0183] Based on any of the above embodiments, the grid parameter includes grid frequency.

[0184] Fig. 9 The figure is a flow chart of a control method of a flywheel system according to another embodiment of the present invention.

[0185] like Fig. 9 As shown, the control method of the flywheel system of the embodiment of the present invention includes:

[0186] S901, detecting operating parameters of the flywheel system and / or grid parameters.

[0187] It should be noted that the relevant content of step S901 can be found in the above embodiment and will not be repeated here.

[0188] S902, 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 phase regulator to switch to the generator state, so that the phase regulator converts the second kinetic energy into the second electrical energy of the set frequency and outputs the second electrical energy to the grid.

[0189] 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 phase regulator can be controlled to switch to the generator state, so that the phase regulator 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 phase regulator to generate the second electric energy of the set frequency through the electromagnetic coupler, and output the second electric energy of the set frequency to the grid, thereby increasing the grid frequency.

[0190] It should be noted that there is no excessive limitation on the seventh setting threshold, for example, the seventh setting threshold is 50 Hz.

[0191] S903, if the grid frequency is greater than an eighth set threshold, control the operating state of the phase regulator to switch to a motor state, so that the phase regulator converts the first electrical energy of the grid into the first kinetic energy, and controls the flywheel rotor to store the first kinetic energy.

[0192] It should be noted that the seventh set threshold is less than or equal to the eighth set threshold.

[0193] 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 high, the operating state of the phase regulator can be controlled to switch to the motor state, so that the phase regulator 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 phase regulator absorbs electrical energy from the grid, thereby reducing the grid frequency, and the phase regulator can drive the flywheel rotor to increase the speed through the electromagnetic coupler, that is, controlling the flywheel rotor to store the first kinetic energy can be achieved by increasing the speed of the flywheel rotor.

[0194] It should be noted that there is no excessive limitation on the eighth set threshold, for example, the eighth set threshold is 50 Hz.

[0195] In summary, according to the control method of the flywheel system in an embodiment of the present invention, the operating state of the phase regulator 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.

[0196] Based on any of the above embodiments, the rotational speed of the phase regulator is positively correlated with the grid frequency. Then in step S502, the phase regulator is switched within multiple operating states according to the operating parameters and / or grid parameters, including if the rotational speed of the phase regulator is less than a ninth 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 phase regulator to switch to a generator state, so that the phase regulator converts the second kinetic energy into second electrical energy of a set frequency and outputs the second electrical energy to the grid.

[0197] If the rotation speed of the phase regulator is greater than the tenth set threshold, indicating that the grid frequency is high, the operating state of the phase regulator is controlled to switch to the motor state, so that the phase regulator converts the first electrical energy of the grid into the first kinetic energy, and controls the flywheel rotor to store the first kinetic energy.

[0198] It should be noted that the ninth setting threshold is less than or equal to the tenth setting threshold. There are no excessive restrictions on the ninth setting threshold and the tenth setting threshold. For example, the ninth setting threshold and the tenth setting threshold are 3000 rpm.

[0199] Therefore, in this method, the operating state of the phase regulator can be controlled to switch to the motor state or the generator state according to the rotation speed of the phase regulator 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.

[0200] Based on any of the above embodiments, in step S502, the state of the phase regulator 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 phase regulator to switch to the standby state.

[0201] 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 fifth setting threshold and less than or equal to the sixth setting threshold, and / or the grid voltage is greater than or equal to the first setting threshold and less than or equal to the third setting threshold, and / or the grid power factor is greater than or equal to the fourth setting threshold and less than or equal to the second setting threshold, and / or the grid frequency is greater than or equal to the seventh setting threshold and less than or equal to the eighth setting threshold, and / or the speed of the phase regulator is greater than or equal to the ninth setting threshold and less than or equal to the tenth setting threshold.

[0202] 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.

[0203] 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 phase regulator is controlled to switch to the standby state.

[0204] 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, an electromagnetic coupler 120, a phase regulator 30, a reactive power compensation device 110, a power grid detection device 60, a controller 70 and an energy management device 80.

[0205] The grid detection device 60 is used to detect grid parameters, the energy management device 80 is used to generate control instructions for the flywheel system based on the operating parameters and / or grid parameters of the flywheel system 100, and / or receive control instructions for the flywheel system, and the controller 70 is used to control the flywheel system according to the control instructions of the flywheel system.

[0206] In one embodiment, the control instructions of the flywheel system include but are not limited to reactive power compensation instructions, discharge instructions for the second rotor of the electromagnetic coupler, power extraction instructions for the second rotor, state switching instructions for the phase regulator, kinetic energy release instructions for the flywheel rotor (i.e., discharge instructions), kinetic energy storage instructions (i.e., charging instructions), speed ratio configuration instructions for the speed change device, etc.

[0207] In one embodiment, Fig.10 As shown, the power grid detection device 60 is connected to the energy management device 80 through a communication line 86, the energy management device 80 is connected to the controller 70 through a communication line 87, the controller 70 is connected to the flywheel rotor 111 through a communication line 71, the controller 70 is connected to the electromagnetic coupler 120 through a communication line 74, the controller 70 is connected to the phase regulator 30 through a communication line 73, and the controller 70 is connected to the reactive power compensation device 110 through a communication line 711.

[0208] In one embodiment, Fig.11 As shown, the flywheel system 100 of the embodiment of the present invention further includes a speed change device 20, and the flywheel rotor 111 is drivingly connected to the inner rotor 2 via the speed change device 20. The controller 70 is connected to the speed change device 20 via a communication line 72.

[0209] In one embodiment, 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 .

[0210] It should be noted that Fig.10 , 11 The flywheel system shown is only an example of the flywheel system of the embodiment of the present invention, and is not a limitation of the flywheel system of the embodiment of the present invention. Fig.10 , 11 The flywheel system shown will not be described in detail here.

[0211] As another possible implementation, Fig.12 As shown, the flywheel system 100 of the embodiment of the present invention includes a flywheel rotor 111, a motor 112, an electromagnetic coupler 120, a generator 50 and a reactive power compensation device 110. The motor 112 is connected to the flywheel rotor 111 in a transmission manner, the electromagnetic coupler 120 includes an outer rotor 1, an inner rotor 2 and a frequency converter 3, the flywheel rotor 111 is connected to the inner rotor 2 in a transmission manner, the inner rotor 2 is connected to the frequency converter 3, the frequency converter 3 is not connected to the power grid, the outer rotor 1 is connected to the generator 50 in a transmission manner, the generator 50 and the reactive power compensation device 110 are connected to the power grid respectively, and the speed of the outer rotor 1 is maintained at a set speed.

[0212] The following describes Fig.12The control method of the flywheel system shown.

[0213] In an embodiment of the present invention, the operating parameters and / or grid parameters of the flywheel system can be detected, and the operating parameters of the second rotor can be adjusted by the frequency converter according to the rotational speed of the flywheel rotor so that the magnetic field speed of the second rotor is maintained at the set rotational speed, and / or, according to the operating parameters and / or grid parameters, it is identified that the set reactive compensation conditions are currently met, and the reactive compensation device is controlled to perform reactive compensation on the grid.

[0214] In one implementation, in response to the reactive power compensation instruction, the reactive power compensation device may be controlled to perform reactive power compensation on the power grid.

[0215] In one embodiment, Fig.13 As shown, the flywheel system 100 of the embodiment of the present invention also includes a speed change device 20, and the flywheel rotor 111 is transmission-connected to the inner rotor 2 via the speed change device 20. The method also includes: configuring the speed ratio of the speed change device according to the rotational speed of the flywheel rotor so that the rotational speed of the second rotor is maintained within a set range.

[0216] In one embodiment, if the speed of the flywheel rotor is less than the fifth set threshold value, and / or a charge instruction of the flywheel rotor is received, the electric motor is controlled to convert the first electrical energy of the power grid into the first kinetic energy, and the flywheel rotor is controlled to store the first kinetic energy. On the contrary, if the speed of the flywheel rotor is greater than the sixth 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 generator is controlled to convert the second kinetic energy into the second electrical energy of the set frequency, and the second electrical energy is output to the power grid.

[0217] In one embodiment, if the grid frequency is less than the seventh set threshold, the flywheel rotor is controlled to release the second kinetic energy, and the generator is controlled to convert the second kinetic energy into second electrical energy of the set frequency, and output the second electrical energy to the grid; conversely, if the grid frequency is greater than the eighth set threshold, the 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.

[0218] In one embodiment, based on the operating parameters and / or the grid parameters, it is identified that the set standby condition is currently met, and the generator is controlled to be in the standby state.

[0219] It should be noted that Fig.12 , Fig.13 The flywheel system shown, and the related contents of the control method of the flywheel system mentioned above can be found in the above embodiments, which will not be repeated here.

[0220] It should be noted that Fig.12 , 13The flywheel system shown is only an example of the flywheel system of the embodiment of the present invention, and is not a limitation of the flywheel system of the embodiment of the present invention. Fig.12 , 13 The flywheel system shown will not be described in detail here.

[0221] In order to implement the above embodiment, the present invention also provides a control device for a flywheel system.

[0222] Fig.14 The structure diagram of the control device of the flywheel system according to one embodiment of the present invention. The flywheel system includes a flywheel rotor, an electromagnetic coupler, a phase regulator and a reactive power compensation device, the electromagnetic coupler includes a first rotor, a second rotor and a frequency converter, the flywheel rotor is connected to the second rotor in a transmission manner, the second rotor is connected to the frequency converter, the frequency converter is not connected to the power grid, the first rotor is connected to the phase regulator in a transmission manner, the phase regulator and the reactive power compensation device are connected to the power grid respectively, and the speed of the first rotor is maintained at a set speed;

[0223] like Fig.14 As shown, the control device 200 of the flywheel system according to the embodiment of the present invention includes: a detection module 210 , a regulation module 220 , and a control module 230 .

[0224] A detection module 210, configured to detect operating parameters of the flywheel system and / or grid parameters;

[0225] The adjustment module 220 is used to adjust the operating parameters of the second rotor through the frequency converter according to the rotation speed of the flywheel rotor, so that the magnetic field rotation speed of the second rotor is maintained at the set rotation speed;

[0226] The control module 230 is used to identify whether the set reactive power compensation conditions are currently met according to the operating parameters and / or the grid parameters, and control the reactive power compensation device to perform reactive power compensation on the grid.

[0227] In one embodiment of the present invention, the control module 230 is also used to: if the grid voltage is less than a first set threshold, and / or the grid power factor is greater than a second 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 third set threshold, and / or the grid power factor is less than a fourth 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 first set threshold is less than or equal to the third set threshold, and the fourth set threshold is less than or equal to the second set threshold.

[0228] In one embodiment of the present invention, the control module 230 is further configured to: in response to a reactive power compensation instruction, control the reactive power compensation device to perform reactive power compensation on the power grid.

[0229] In one embodiment of the present invention, the flywheel system also includes a speed changing device, and the flywheel rotor is transmission-connected to the second rotor via the speed changing device. The control device 200 of the flywheel system also includes: a configuration module, and the configuration module is used to: configure the speed ratio of the speed changing device according to the rotational speed of the flywheel rotor so that the rotational speed of the second rotor is maintained within a set range.

[0230] In one embodiment of the present invention, the control device 200 of the flywheel system further includes: a switching module, wherein the switching module is used to switch the state of the phase regulator within multiple operating states according to the operating parameters and / or the grid parameters.

[0231] 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 fifth set threshold value, and / or a charging instruction of the flywheel rotor is received, control the operating state of the phase regulator to switch to the motor state, so that the phase regulator 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.

[0232] In one embodiment of the present invention, the flywheel system also includes an electric motor, which is transmission-connected to the flywheel rotor. The control module 230 is also used to: if the rotational speed of the flywheel rotor is less than a fifth 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.

[0233] In one embodiment of the present invention, the switching module is further used to: if the rotation speed of the flywheel rotor is less than the fifth set threshold, and / or a charging instruction of the flywheel rotor is received, control the operating state of the phase regulator to switch to a standby state.

[0234] 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 sixth 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 phase regulator to switch to a generator state, so that the phase regulator 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 fifth set threshold value is less than or equal to the sixth set threshold value.

[0235] In one embodiment of the present invention, the switching module is also used to: if the grid voltage is less than a first set threshold value, and / or the grid power factor is greater than a second set threshold value, control the operating state of the phase modulator to switch to a first phase adjustment state so that the phase modulator outputs reactive power to the grid; if the grid voltage is greater than a third set threshold value, and / or the grid power factor is less than a fourth set threshold value, control the operating state of the phase modulator to switch to a second phase adjustment state so that the phase modulator absorbs reactive power from the grid; wherein the first set threshold value is less than or equal to the third set threshold value, and the fourth set threshold value is less than or equal to the second set threshold value.

[0236] 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 phase regulator to switch to a generator state, so that the phase regulator converts the second kinetic energy into second electrical energy of a set frequency, and outputs the second electrical energy to the grid.

[0237] 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 phase regulator to switch to a motor state, so that the phase regulator 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.

[0238] 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 phase regulator to switch to the standby state.

[0239] In one embodiment of the present invention, the operating parameters include at least one of the rotational speed of the flywheel rotor and the rotational speed of the phase regulator, and the grid parameters include at least one of the grid voltage, the grid power factor and the grid frequency.

[0240] In one embodiment of the present invention, the first rotor is an outer rotor and the second rotor is an inner rotor, or the first rotor is an inner rotor and the second rotor is an outer rotor.

[0241] 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.

[0242] In summary, the control device of the flywheel system of the embodiment of the present invention can adjust the operating parameters of the second rotor according to the rotational speed of the flywheel rotor so that the magnetic field rotational speed of the second rotor is maintained at a set rotational speed, and the rotational speed of the first rotor is maintained at a set rotational speed, thereby driving the phase shifter to generate electric energy of a set frequency, so as to output electric energy of a set frequency to the power grid, which helps to improve the stability of the flywheel system's power generation, and can also comprehensively consider the operating parameters of the flywheel system and / or the power grid parameters to identify the current conditions for satisfying the set reactive compensation, and then control the reactive compensation device to perform reactive compensation on the power grid, which helps to improve the stability of the power grid and ensure the normal operation of the flywheel system.

[0243] In order to realize the above-mentioned embodiment, the embodiment of the present invention proposes a flywheel system, including a flywheel rotor, an electromagnetic coupler, a phase modulator and a reactive compensation device, the electromagnetic coupler includes a first rotor, a second rotor and a frequency converter, the flywheel rotor is transmission-connected to the second rotor, the second rotor is connected to the frequency converter, the frequency converter is not connected to the power grid, the first rotor is transmission-connected to the phase modulator, the phase modulator and the reactive compensation device are respectively connected to the power grid, and the rotation speed of the first rotor is maintained at a set rotation speed; and the control device 200 of the above-mentioned flywheel system.

[0244] It should be noted that the flywheel system of the embodiment of the present invention is described below by taking the first rotor as an outer rotor and the second rotor as an inner rotor as an example.

[0245] like Fig.15 As shown, the embodiment of the present invention proposes a flywheel system 100, including a flywheel rotor 111, an electromagnetic coupler 120, a phase condenser 30 and a reactive power compensation device 110. The electromagnetic coupler 120 includes an outer rotor 1, an inner rotor 2 and a frequency converter 3, the flywheel rotor 111 is transmission-connected with the inner rotor 2, the inner rotor 2 is connected with the frequency converter 3, the frequency converter 3 is not connected to the power grid, the outer rotor 1 is transmission-connected with the phase condenser 30, the phase condenser 30 and the reactive power compensation device 110 are respectively connected to the power grid, and the speed of the outer rotor 1 is maintained at a set speed; and the control device 200 of the flywheel system described above.

[0246] In one embodiment, if Fig.16 As shown, the flywheel system 100 of the embodiment of the present invention further includes a speed change device 20 , and the flywheel rotor 111 is transmission-connected to the inner rotor 2 via the speed change device 20 .

[0247] In one embodiment, if Fig.16 As shown, the flywheel system 100 further includes an electric motor 112 , which is drivingly connected to the flywheel rotor 111 .

[0248] It should be noted that Fig.15 , 16The flywheel system shown is only an example of the flywheel system of the embodiment of the present invention, and is not a limitation of the flywheel system of the embodiment of the present invention. Fig.15 , 16 The flywheel system shown will not be described in detail here.

[0249] In summary, the flywheel system of the embodiment of the present invention can adjust the operating parameters of the second rotor according to the rotational speed of the flywheel rotor so that the magnetic field rotational speed of the second rotor is maintained at a set rotational speed, and the rotational speed of the first rotor is maintained at a set rotational speed, thereby driving the phase shifter to generate electric energy of a set frequency, so as to output electric energy of a set frequency to the power grid, which helps to improve the stability of the flywheel system's power generation, and can also comprehensively consider the operating parameters of the flywheel system and / or the power grid parameters to identify the current conditions that meet the set reactive compensation conditions, and then control the reactive compensation device to perform reactive compensation on the power grid, which helps to improve the stability of the power grid and ensure the normal operation of the flywheel system.

[0250] In order to implement the above embodiment, Fig.17 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.

[0251] The electronic device of the embodiment of the present invention can adjust the operating parameters of the second rotor according to the rotational speed of the flywheel rotor through the processor executing the computer program stored in the memory, so that the magnetic field rotational speed of the second rotor is maintained at the set rotational speed, and the rotational speed of the first rotor is maintained at the set rotational speed, thereby driving the phase regulator to generate electric energy of the set frequency to output electric energy of the set frequency to the power grid, which helps to improve the stability of the flywheel system's power generation. It can also comprehensively consider the operating parameters of the flywheel system and / or the power grid parameters to identify the current conditions that meet the set reactive compensation conditions, and then control the reactive compensation device to perform reactive compensation on the power grid, which helps to improve the stability of the power grid and ensure the normal operation of the flywheel system.

[0252] 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.

[0253] The computer-readable storage medium of the embodiment of the present invention can adjust the operating parameters of the second rotor according to the rotational speed of the flywheel rotor by storing a computer program and being executed by a processor, so that the magnetic field rotational speed of the second rotor is maintained at a set rotational speed, and the rotational speed of the first rotor is maintained at a set rotational speed, thereby driving the phase shifter to generate electric energy of a set frequency to output electric energy of a set frequency to the power grid, which helps to improve the stability of the flywheel system's power generation, and can also comprehensively consider the operating parameters of the flywheel system and / or the power grid parameters to identify the current conditions for satisfying the set reactive compensation, and then control the reactive compensation device to perform reactive compensation on the power grid, which helps to improve the stability of the power grid and ensure the normal operation of the flywheel system.

[0254] 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.

[0255] 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.

[0256] 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.

[0257] 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.

[0258] 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.

[0259] 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 includes a flywheel rotor, an electromagnetic coupler, a phase regulator and a reactive power compensation device. The electromagnetic coupler includes a first rotor, a second rotor and a frequency converter. The flywheel rotor is connected to the second rotor in a transmission manner. The second rotor is connected to the frequency converter, and the frequency converter is not connected to the power grid. The first rotor is connected to the phase regulator in a transmission manner. The phase regulator and the reactive power compensation device are connected to the power grid respectively. The speed of the first rotor is maintained at a set speed. The method comprises: Detecting operating parameters of the flywheel system and / or grid parameters; According to the rotation speed of the flywheel rotor, the operating parameters of the second rotor are adjusted by the frequency converter so that the magnetic field rotation speed of the second rotor is maintained at the set rotation speed; According to the operating parameters and / or the grid parameters, it is identified that the set reactive power compensation condition is currently satisfied, and the reactive power compensation device is controlled to perform reactive power compensation on the grid.

2. The method according to claim 1, characterized in that The step of identifying, according to the operating parameter and / or the grid parameter, that a set reactive power compensation condition is currently satisfied and controlling the reactive power compensation device to perform reactive power compensation on the grid comprises: If the grid voltage is less than a first set threshold value, and / or the grid power factor is greater than a second 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 third set threshold value, and / or the grid power factor is less than a fourth set threshold value, identifying that a set second reactive power compensation condition is currently met, and controlling the reactive power compensation device to absorb reactive power from the grid; The first set threshold is less than or equal to the third set threshold, and the fourth set threshold is less than or equal to the second set threshold.

3. The method according to claim 1, characterized in that Also includes: In response to the reactive power compensation instruction, the reactive power compensation device is controlled to perform reactive power compensation on the power grid.

4. The method according to claim 1, characterized in that: The flywheel system further includes a speed change device, and the flywheel rotor is drivingly connected to the second rotor via the speed change device. The method further includes: The speed ratio of the speed change device is configured according to the rotation speed of the flywheel rotor so that the rotation speed of the second rotor is maintained within a set range.

5. The method according to claim 1, characterized in that Also includes: The phase modulator is switched within a plurality of operating states according to the operating parameters and / or the grid parameters.

6. The method according to claim 5, characterized in that The switching of the phase regulator 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 the fifth set threshold, and / or a charging instruction of the flywheel rotor is received, the operating state of the phase regulator is controlled to switch to the motor state, so that the phase regulator 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.

7. The method according to claim 5, 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 fifth 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.

8. The method according to claim 7, characterized in that The switching of the phase regulator 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 the fifth set threshold value, and / or a charging instruction of the flywheel rotor is received, the operating state of the phase regulator is controlled to switch to a standby state.

9. The method according to claim 6 or 7, characterized in that: The switching of the phase regulator 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 sixth 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 phase regulator is controlled to switch to a generator state, so that the phase regulator converts the second kinetic energy into second electrical energy of a set frequency, and outputs the second electrical energy to the power grid; Among them, the fifth set threshold is less than or equal to the sixth set threshold.

10. The method according to any one of claims 5 to 8, characterized in that: The switching of the phase regulator 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 first set threshold value, and / or the grid power factor is greater than a second set threshold value, controlling the operation state of the phase modulator to switch to a first phase modulation state, so that the phase modulator outputs reactive power to the grid; If the grid voltage is greater than a third set threshold value, and / or the grid power factor is less than a fourth set threshold value, controlling the operating state of the phase modulator to switch to a second phase modulation state, so that the phase modulator absorbs reactive power from the grid; The first set threshold is less than or equal to the third set threshold, and the fourth set threshold is less than or equal to the second set threshold.

11. The method according to any one of claims 5 to 8, characterized in that: The switching of the phase regulator 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 phase regulator is controlled to switch to a generator state, so that the phase regulator converts the second kinetic energy into second electrical energy of a set frequency and outputs the second electrical energy to the grid.

12. The method according to claim 11, characterized in that The switching of the phase regulator 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 phase regulator to switch to a motor state, so that the phase regulator 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.

13. The method according to any one of claims 5 to 8, characterized in that: The switching of the phase regulator 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 phase regulator is controlled to switch to the standby state.

14. The method according to any one of claims 1 to 8, characterized in that: The operating parameters include at least one of the rotational speed of the flywheel rotor and the rotational speed of the phase regulator, and the grid parameters include at least one of the grid voltage, the grid power factor, and the grid frequency.

15. The method according to any one of claims 1 to 8, characterized in that: The first rotor is an outer rotor and the second rotor is an inner rotor, or the first rotor is an inner rotor and the second rotor is an outer rotor.

16. A control device for a flywheel system, characterized in that: The flywheel system includes a flywheel rotor, an electromagnetic coupler, a phase regulator and a reactive power compensation device. The electromagnetic coupler includes a first rotor, a second rotor and a frequency converter. The flywheel rotor is connected to the second rotor in a transmission manner. The second rotor is connected to the frequency converter, and the frequency converter is not connected to the power grid. The first rotor is connected to the phase regulator in a transmission manner. The phase regulator and the reactive power compensation device are connected to the power grid respectively. The speed of the first rotor is maintained at a set speed. The control device of the flywheel system comprises: A detection module, used to detect operating parameters and / or grid parameters of the flywheel system; an adjusting module, configured to adjust the operating parameters of the second 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 second rotor at the set rotation speed; The control module is used to identify whether the set reactive power compensation conditions are currently met according to the operating parameters and / or the grid parameters, and control the reactive power compensation device to perform reactive power compensation on the grid.

17. A flywheel system, characterized in that: The flywheel system includes a flywheel rotor, an electromagnetic coupler, a phase regulator and a reactive power compensation device. The electromagnetic coupler includes a first rotor, a second rotor and a frequency converter. The flywheel rotor is connected to the second rotor in a transmission manner. The second rotor is connected to the frequency converter, and the frequency converter is not connected to the power grid. The first rotor is connected to the phase regulator in a transmission manner. The phase regulator and the reactive power compensation device are connected to the power grid respectively. The speed of the first rotor is maintained at a set speed. 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 further comprises a speed changing device, through which the flywheel rotor is drivingly connected to the second rotor.

19. 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.

20. The flywheel system of claim 17, wherein: The first rotor is an outer rotor and the second rotor is an inner rotor, or the first rotor is an inner rotor and the second rotor is an outer rotor.

21. 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.

22. 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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