Fault-tolerant operation method and device of inertia flywheel system

Abstract

The invention discloses a fault-tolerant operation method and device of an inertia flywheel system. The method comprises the steps that whether a power grid breaks down or not is judged according to power grid fault occurrence conditions; responding to the condition that the power grid does not fail, using the power grid to supply power to the electromagnetic coupler through the electric energy conversion unit; and in response to the fault of the power grid, the UPS motor supplies power to the electromagnetic coupler through the electric energy conversion unit. According to the scheme, the power grid or the UPS motor supplies power to the electromagnetic coupler through the electric energy conversion unit according to the power grid fault judgment result, the system can still complete normal functions when the power grid breaks down, and the fault tolerance rate and reliability of the system are improved.

Description

Technical Field

[0001] This application generally relates to the technical field of energy storage. More specifically, this application relates to a fault-tolerant operation method and device for an inertia flywheel system. Background Art

[0002] In the context where the concept of the energy Internet is gradually attracting attention, with the increasing proportion of new energy, people have begun to focus on the inertia and frequency regulation issues of power systems. Traditional power systems rely on large-scale rotating inertia generating equipment to maintain frequency stability. However, the large-scale access of distributed energy sources such as wind energy and solar energy has led to insufficient inertia in the power system. In this case, the power system faces challenges such as frequency fluctuations and insufficient frequency regulation capabilities. To address these issues, a series of technical and management measures need to be taken, including increasing the application of energy storage systems, developing smart grid technologies, and strengthening cross-regional coordination. Solving the inertia and frequency regulation problems under the energy Internet can provide technical and management support for the stable operation and sustainable development of the power system.

[0003] In the prior art, when solving the inertia and frequency regulation problems of new energy, it mainly relies on synchronous condensers and energy storage technologies. A synchronous condenser is a traditional generator frequency regulation device that mainly provides inertial support by adjusting the mechanical rotational inertia of the generator rotor to maintain the stability of the grid frequency. However, a synchronous condenser itself cannot generate active power, and its function is mainly to provide inertial support rather than directly participate in the active power regulation of the power system. In contrast, an inertia flywheel has a large inertia and fast response capabilities, so it can not only provide stable inertia support but also achieve fast active power regulation. However, existing inertia flywheel systems cannot perform normal functions when a grid fault occurs, and their fault tolerance and reliability are relatively low.

[0004] In view of this, there is an urgent need to provide a fault-tolerant operation solution for an inertia flywheel system so that the system can still perform normal functions when a grid fault occurs, enhancing the fault tolerance and reliability of the system. Summary of the Invention

[0005] To at least solve one or more of the above-mentioned technical problems, this application proposes a fault-tolerant operation solution for an inertia flywheel system in multiple aspects.

[0006] In a first aspect, this application provides a fault-tolerant operation method for an inertia flywheel system, including: determining whether a grid fault has occurred using the grid fault occurrence condition; in response to the grid not having a fault, supplying power to the electromagnetic coupler by the grid through the power conversion unit; in response to the grid having a fault, supplying power to the electromagnetic coupler by the UPS motor through the power conversion unit.

[0007] In some embodiments, the power conversion unit includes a first inverter, a second inverter, a DC bus, and a rectifier. A first end of the first inverter is connected to the UPS motor. A first end of the second inverter and a second end of the first inverter are both connected to the DC bus. A second end of the second inverter is connected to the outer rotor. The rectifier is connected between the DC bus and the power grid.

[0008] In some embodiments, the power grid fault occurrence condition is that the voltage amplitude of the power grid is not within the voltage amplitude threshold range, the voltage frequency is not within the voltage frequency threshold range, or the harmonic content of the power grid is less than or equal to the harmonic content threshold.

[0009] In some embodiments, during the process of the power grid supplying power to the electromagnetic coupler through the power conversion unit, the following steps are executed: controlling the switch of the rectifier to close; determining whether the output power of the UPS motor is 0; in response to the output power of the UPS motor being 0, controlling the switch of the first inverter to open; in response to the output power of the UPS motor not being 0, reducing the output power of the UPS motor until it is 0.

[0010] In some embodiments, during the process of the UPS motor supplying power to the electromagnetic coupler through the power conversion unit, the following steps are executed: controlling the switch of the first inverter to close; determining whether the output power of the power grid is 0; in response to the output power of the power grid being 0, controlling the switch of the rectifier to open; in response to the output power of the power grid not being 0, reducing the output power of the power grid until it is 0.

[0011] In a second aspect, the present application provides a fault-tolerant operation device for an inertia flywheel system, which performs fault-tolerant operation by using the fault-tolerant operation method of the inertia flywheel system according to any one of the embodiments in the first aspect. The device includes: a judgment module, configured to judge whether the power grid has a fault by using the power grid fault occurrence condition; an execution module, configured to, in response to the power grid not having a fault, supply power to the electromagnetic coupler through the power conversion unit by the power grid; and in response to the power grid having a fault, supply power to the electromagnetic coupler through the power conversion unit by the UPS motor.

[0012] In a third aspect, the present application provides an electronic device, including: a processor; a memory storing a computer program, wherein when the computer program is executed by the processor, the processor is caused to execute the fault-tolerant operation method of the inertia flywheel system according to any one of the embodiments in the first aspect.

[0013] In a fourth aspect, the present application provides a readable storage medium, on which computer-readable instructions are stored, and when the instructions are executed by a processor, the processor is caused to execute the fault-tolerant operation method of the inertia flywheel system according to any one of the embodiments in the first aspect.

[0014] Through the fault-tolerant operation solution of the inertia flywheel system provided above, according to the power grid fault judgment result, the power grid or the UPS motor supplies power to the electromagnetic coupler through the power conversion unit in the embodiment of the present application, which can enable the system to still complete normal functions when the power grid fails, enhancing the fault tolerance and reliability of the system. Description of the Drawings

[0015] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present application will become readily understandable. In the drawings, several embodiments of the present application are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, where:

[0016] Figure 1 Shows a schematic diagram of the composition of the inertia flywheel system according to an embodiment of the present application;

[0017] Figure 2 Shows a structural diagram of the electromagnetic coupler according to an embodiment of the present application;

[0018] Figure 3 Shows an exemplary flowchart of the fault-tolerant operation method of the inertia flywheel system according to an embodiment of the present application;

[0019] Figure 4 Shows an exemplary flowchart of the process of supplying power to the electromagnetic coupler by the power grid through the power conversion unit according to an embodiment of the present application;

[0020] Figure 5 Shows an exemplary flowchart of the process of supplying power to the electromagnetic coupler by the UPS motor through the power conversion unit according to an embodiment of the present application;

[0021] Figure 6 Shows a schematic diagram of controlling the operation process of the inertia flywheel system according to an embodiment of the present application;

[0022] Figure 7 Shows a schematic diagram of the composition of the fault-tolerant operation device of the inertia flywheel system according to an embodiment of the present application;

[0023] Figure 8 Shows a schematic diagram of the composition of the electronic device according to an embodiment of the present application. Detailed Embodiments

[0024] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present application.

[0025] It should be understood that the terms "comprising" and "including" as used in the specification and claims of this application indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0026] It should also be understood that the terms used in the specification of this application are merely for the purpose of describing specific embodiments and are not intended to limit this application. As used in the specification and claims of this application, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms. It should be further understood that the term "and / or" as used in the specification and claims of this application refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0027] As used in this specification and the claims, the term "if" can be interpreted, depending on the context, as "when", "once", "in response to determining", or "in response to detecting". Similarly, the phrase "if determined" or "if [the described condition or event] is detected" can be interpreted, depending on the context, as meaning "once determined", "in response to determining", "once [the described condition or event] is detected", or "in response to detecting [the described condition or event]".

[0028] The following will describe in detail the specific embodiments of this application with reference to the accompanying drawings.

[0029] Figure 1 A schematic diagram showing the composition of the inertia flywheel system according to an embodiment of this application is shown.

[0030] As Figure 1 shown, the inertia flywheel 100 includes a storage flywheel 110, a UPS motor 120, an electromagnetic coupler 130, a synchronous condenser 140, and an electric energy conversion unit 150.

[0031] In the embodiment of this application, for the specific structure of the electromagnetic coupler 130, reference can be made to Figure 2 .

[0032] As Figure 2 shown, the electromagnetic coupler 130 includes an inner rotor 131 and an outer rotor 132. The inner rotor uses a permanent magnet, and an armature winding is placed on the outer rotor. The electromagnetic coupler 130 is equivalent to a permanent magnet synchronous motor with both the stator and rotor rotating.

[0033] In an embodiment of the present application, the inner rotor 131 and the rotor of the UPS motor 120 are both connected to the rotor of the energy storage flywheel 110 through the first transmission shaft 161. The rotor of the synchronous condenser 140 is connected to the outer rotor 132 through the second transmission shaft 162, and the stator winding of the synchronous condenser 140 is incorporated into the power grid 170.

[0034] The inner rotor 131 of the electromagnetic coupler 130 and the rotor of the UPS motor 120 are both connected to the rotor of the energy storage flywheel 110 through the first transmission shaft 161, so that the inner rotor 131 of the electromagnetic coupler 130, the UPS motor 120 and the rotor of the energy storage flywheel 110 are coaxially connected. The inner rotor 131 and the outer rotor 132 of the electromagnetic coupler 130 are coupled to each other through electromagnetic action, so that the inertia flywheel system of the present application can provide active power, reactive power and direct mechanical inertia support to the power grid.

[0035] In an embodiment of the present application, the frequency of the electric energy generated by the synchronous condenser 140 is adjusted so that when the frequency of the electric energy generated by the synchronous condenser 140 is consistent with the power grid frequency, the synchronous condenser 140 is directly incorporated into the power grid.

[0036] In an embodiment of the present application, the aforementioned electric energy conversion unit 150 includes a first converter 151, a second converter 152, a DC bus 153 and a rectifier 154. Specifically, the first end of the first converter 151 is connected to the aforementioned UPS motor 120, the first ends of the second converter 152 and the second end of the first converter 151 are both connected to the DC bus 153, the second end of the second converter 152 is connected to the outer rotor 132 of the aforementioned electromagnetic coupler 130, and the rectifier 154 is connected between the DC bus 153 and the power grid 170.

[0037] By connecting the first end of the first converter 151 to the aforementioned UPS motor 120, connecting the second end of the first converter 151 to the DC bus 153, and connecting the rectifier 154 between the DC bus 153 and the power grid 170, it is possible to supply power from the UPS motor 120 to the DC bus 153 and supply power from the power grid 170 to the DC bus 153. Then, by connecting the first ends of the second converter 152 to the DC bus 153 and connecting the second end of the second converter 152 to the outer rotor 132 of the aforementioned electromagnetic coupler 130, it is possible to supply power from the UPS motor 120 to the electromagnetic coupler 130 through the electric energy conversion unit 150 and supply power from the power grid 170 to the electromagnetic coupler 130 through the electric energy conversion unit 150.

[0038] In an embodiment of the present application, the first converter 151 is configured to convert the alternating current output by the UPS motor 120 into direct current and output it to the DC bus 153, or to invert the direct current output by the DC bus 153 into alternating current and output it to the UPS motor 120. That is, the alternating current output by the UPS motor 120 can be converted into direct current by the first converter 151 to supply power to the DC bus 153, or the direct current output by the DC bus 153 can be inverted into alternating current to draw power from the DC bus 153.

[0039] In an embodiment of the present application, the second converter 152 is configured to invert the direct current output by the DC bus 153 into alternating current of a required frequency and output it to the outer rotor 132 winding of the electromagnetic coupler 130, and the outer rotor 132 winding is the armature winding placed on the outer rotor 132 of the aforementioned electromagnetic coupler 130. That is, the electromagnetic coupler 130 adjusts the frequency of the input current of the outer rotor 132 through the second converter 152, so that the inner rotor 131 of the electromagnetic coupler 130 can accelerate and decelerate to drive the rotor of the energy storage flywheel 110 to store and release energy while maintaining the speed of its outer rotor 132 unchanged.

[0040] In an embodiment of the present application, when the current output by the second converter 152 is a positive current, the rotational speed of the inner rotor 131 of the electromagnetic coupler 130 is faster than the rotational speed of the outer rotor 132 of the electromagnetic coupler 130.

[0041] By making the rotational speed of the inner rotor 131 of the electromagnetic coupler 130 faster than the rotational speed of the outer rotor 132 of the electromagnetic coupler 130, the rotational speed of the resultant magnetomotive force of the inner rotor 131 of the electromagnetic coupler 130 is faster than the mechanical rotational speed of the outer rotor 132, and the permanent magnet of the inner rotor 131 of the electromagnetic coupler 130 is subjected to a positive electromagnetic torque and drives the rotor of the energy storage flywheel 110 to accelerate and store energy through the first transmission shaft 161.

[0042] In an embodiment of the present application, when the current output by the second converter 152 is a negative current, the rotational speed of the inner rotor 131 of the electromagnetic coupler 130 is slower than the rotational speed of the outer rotor 132 of the electromagnetic coupler 130.

[0043] By making the rotational speed of the inner rotor 131 of the electromagnetic coupler 130 slower than the rotational speed of the outer rotor 132 of the electromagnetic coupler 130, the rotational speed of the resultant magnetomotive force of the inner rotor 131 of the electromagnetic coupler 130 is slower than the mechanical rotational speed of the outer rotor 132, and the permanent magnet of the inner rotor 131 of the electromagnetic coupler 130 is subjected to a negative direction and drives the rotor of the energy storage flywheel 110 to decelerate and release energy through the first transmission shaft 161.

[0044] In an embodiment of the present application, the rectifier 154 is used to convert the alternating current output by the power grid 170 into direct current and output it to the DC bus 153. That is, the power grid 170 supplies power to the DC bus 153 through the rectifier 154.

[0045] The fault-tolerant operation method of the inertia flywheel system 100 will be described below.

[0046] Figure 3 An exemplary flowchart of the fault-tolerant operation method 300 of the inertia flywheel system according to an embodiment of the present application is shown.

[0047] As Figure 3 shown, in step S310, a power grid fault occurrence condition is used to determine whether the power grid 170 has a fault.

[0048] In an embodiment of the present application, the power grid fault occurrence condition is that the voltage amplitude of the power grid is not within the voltage amplitude threshold range, the voltage frequency is not within the voltage frequency threshold range, or the power grid harmonic content is less than or equal to the harmonic content threshold. That is, when one of the conditions that the voltage amplitude of the power grid is not within the voltage amplitude threshold range, the voltage frequency is not within the voltage frequency threshold range, and the power grid harmonic content is less than or equal to the harmonic content threshold is satisfied, it is determined that the power grid has a fault.

[0049] In an embodiment of the present application, the voltage amplitude threshold range is set according to the normal operating voltage amplitude range of the foregoing power grid 170, the safety requirements of the corresponding equipment involved in the power grid 170, etc., and the present application does not limit this here.

[0050] In an embodiment of the present application, the voltage frequency threshold range is set according to the normal operating voltage frequency range of the foregoing power grid 170, the type of the corresponding equipment involved in the power grid 170, etc., and the present application does not limit this here.

[0051] In an embodiment of the present application, the harmonic content threshold is set according to the voltage level of the foregoing power grid 170, the compatibility requirements of the corresponding equipment involved in the power grid 170, etc., and the present application does not limit this here.

[0052] After step S310 is executed, in response to the power grid 170 not having a fault, in step S320, the power grid 170 supplies power to the electromagnetic coupler 130 through the foregoing power conversion unit 150.

[0053] In an embodiment of the present application, the specific process involved in step S320 can be referred to Figure 4 .

[0054] Figure 4 An exemplary flowchart of the process of the power grid supplying power to the electromagnetic coupler through the power conversion unit according to an embodiment of the present application is shown.

[0055] AsFigure 4 As shown, in step S410, the switch of the aforementioned rectifier 154 is controlled to close. In step S420, it is determined whether the output power of the UPS motor 120 is 0. In response to the output power of the UPS motor 120 being 0, in step S430, the switch of the first converter 151 is controlled to open. In response to the output power of the UPS motor 120 not being 0, the output power of the UPS motor 120 is reduced, and the process returns to step S420 to determine the output power of the UPS motor 120 again until the output power of the UPS motor 120 is 0, and then step S430 is executed.

[0056] In an embodiment of the present application, when the power grid 170 does not fail, the power grid 170 supplies power to the electromagnetic coupler 130 through the rectifier 154 in the power conversion unit 150. At this time, the first converter 151 connected to the UPS motor 120 in the power conversion unit 150 does not work. When it is determined that the power grid 170 does not fail, there are two situations. One situation is that the output power of the UPS motor 120 is 0, and the other situation is that the output power of the UPS motor 120 is not 0. When the output power of the UPS motor 120 is 0, the switch of the first converter 151 is directly opened. At this time, the electromagnetic coupler 130 is completely powered by the power grid 170. When the output power of the UPS motor 120 is not 0, the output power of the UPS motor 120 needs to be reduced until the output power of the UPS motor 120 is 0, and then the switch of the first converter 151 is opened, so that the electromagnetic coupler 130 is completely powered by the power grid 170.

[0057] After step S310 is executed, in response to the power grid 170 failing, in step S330, the UPS motor 120 is used to supply power to the electromagnetic coupler 130 through the aforementioned power conversion unit 150.

[0058] In an embodiment of the present application, the specific process involved in step S330 can be referred to Figure 5 .

[0059] Figure 5 An exemplary flowchart showing the process of the UPS motor 120 in the embodiment of the present application supplying power to the electromagnetic coupler through the power conversion unit is shown.

[0060] As Figure 5 shown, in step S510, the switch of the first converter 151 is controlled to close. In step S520, it is determined whether the output power of the power grid is 0. In response to the output power of the power grid being 0, in step S530, the switch of the rectifier 154 is controlled to open. In response to the output power of the power grid not being 0, the output power of the power grid is reduced, and the process returns to step S520 to determine the output power of the power grid again until the output power of the power grid is 0, and then step S530 is executed.

[0061] In an embodiment of the present application, when a fault occurs in the power grid 170, the UPS motor 120 in the power conversion unit 150 supplies power to the electromagnetic coupler 130 through the first converter 151. At this time, the rectifier 154 in the power conversion unit 150 connected to the power grid 170 does not work. When it is determined that a fault has occurred in the power grid 170, there are two cases. One case is that the output power of the power grid 170 is 0, and the other case is that the output power of the power grid 170 is not 0. When the output power of the power grid 170 is 0, the switch of the rectifier 154 is directly turned off. At this time, the electromagnetic coupler 130 is completely powered by the UPS motor 120. When the output power of the power grid 170 is not 0, it is necessary to reduce the output power of the power grid 170 until the output power of the power grid 170 is 0, and then the switch of the rectifier 154 is turned off, so that the electromagnetic coupler 130 is completely powered by the UPS motor 120.

[0062] In an embodiment of the present application, through step 320 and step S330, the power grid or the UPS motor can be used to supply power to the load according to the fault occurrence judgment result of the power grid, thereby ensuring continuous power supply at the load end and avoiding damage to sensitive equipment caused by sudden power failure due to power grid faults.

[0063] At the same time, through step 320 and step S330, during the process of using the power grid to supply power to the load, first close the switch of the rectifier connected thereto, and let it gradually take on the task of power output until the output power of the UPS motor drops to zero, and then turn off the switch of the first converter connected to the UPS motor. During the process of using the UPS motor to supply power to the load, first close the switch of the first converter connected thereto, and let it gradually take on the task of power output until the output power of the power grid drops to zero, and then turn off the switch of the rectifier connected to the power grid. Such an operation process effectively avoids the problem of large current impact that may be brought about by directly restoring power supply from the power grid or directly switching to the UPS motor for power supply, and protects the safe operation of the entire power system and its downstream equipment. In addition, whether switching from power grid power supply to the UPS motor or vice versa, a progressive power transfer strategy is adopted, so that the voltage change experienced by the load is very small and almost no interference is felt, which is particularly important for occasions with extremely high requirements for power quality.

[0064] In an embodiment of the present application, the above-mentioned fault-tolerant operation method 300 of the inertia flywheel system is used to control the operation process of the inertia flywheel system. For the specific control process, reference can be made to Figure 6 。

[0065] Figure 6 Fig. shows a schematic diagram of controlling the operation process of the inertia flywheel system according to an embodiment of the present application.

[0066] As Figure 6 shown, when the UPS motor 120 is used to supply power to the electromagnetic coupler 130, the switch of the first converter 151 connected to the UPS motor 120 is closed, and when the output power of the power grid 170 is 0, the switch of the rectifier 154 connected to the power grid 170 is opened. Then, the actual angular velocity ω e of the rotor of the UPS motor 120, the actual angular displacement θ e of the rotor of the UPS motor 120, the AC voltage signal u 1abc output by the UPS motor 120, and the AC current signal i 1abc are subjected to corresponding operations through the first converter 151 to obtain the d-axis voltage u 1d , d-axis current i 1d , q-axis voltage u 1q , and q-axis current i 1q . Then, the α-axis component u 1α of the first drive signal and the β-axis component u 1β of the first drive signal are obtained. Then, space vector pulse width modulation (SVPWM) is performed on the α-axis component u 1α of the first drive signal and the β-axis component u 1β of the first drive signal, and are input into the second converter 152 connected to the electromagnetic coupler 130. The second converter 152 converts the α-axis component u 1α of the first drive signal and the β-axis component u 1β into an AC current signal i 3abc of the required frequency, and then the AC current signal i 3abc is subjected to a 3s / 2r transformation to obtain the d-axis current i 3d and the q-axis current i 3q . Finally, corresponding operations are performed on the d-axis current i 3d , q-axis current i 3q , the angular velocity ω m of the outer rotor output by the electromagnetic coupler 130, and the angular displacement θ m of the outer rotor output by the electromagnetic coupler 130 to obtain the α-axis component u 3α of the third drive signal and the β-axis component u 3β .

[0067] When the power grid 170 is used to supply power to the electromagnetic coupler 130, the switch of the rectifier 154 connected to the power grid 170 is closed, and when the output power of the UPS motor 120 is 0, the switch of the first converter 151 connected to the UPS motor 120 is opened. Then, the AC voltage signal u 2abc output by the power grid 170 and the AC current signal 2abc The d-axis voltage u obtained by transformation through the rectifier 154 2d and the d-axis current i 2d as well as the q-axis voltage u 2q and the q-axis current i 2q , and the AC voltage signal u output by the power grid 170 2abc and the AC current signal 2 abc are processed through a phase-locked loop (PLL) controller to obtain the angular velocity ω g and the angular displacement θ g . Then, corresponding operations are performed on the voltage U output by the DC bus dc , the d-axis voltage u 2d , the d-axis current i 2d , the q-axis voltage u 2q , the q-axis current i 2q , the angular velocity ω g and the angular displacement θ g to obtain the α-axis component u of the second drive signal 2α and the β-axis component u of the second drive signal 2β . Then, the α-axis component u of the second drive signal 2α and the β-axis component u of the second drive signal 2β are subjected to the same processing procedure as the α-axis component u of the aforementioned first drive signal 1α and the β-axis component u of the first drive signal 1β to obtain the AC current signal i 3abc . The AC current signal i 3abc is subjected to a 3s / 2r transformation to obtain the d-axis current i 3d and the q-axis current i 3q . Finally, corresponding operations are performed on the d-axis current i 3d , the q-axis current i 3q , the angular velocity ω of the outer rotor output by the electromagnetic coupler 130 m and the angular displacement θ of the outer rotor output by the electromagnetic coupler 130 m to obtain the α-axis component u of the third drive signal 3α and the β-axis component u of the third drive signal 3β .

[0068] In the embodiment of the present application, in the process of obtaining the α-axis component u of the first drive signal 1α and the β-axis component u of the first drive signal 1β , the following steps are executed: Subtract the actual power P from the power threshold P to obtain a power error value, and subtract the actual voltage U from the voltage threshold U ref and the actual voltage U ref dc ​Subtract to obtain a voltage error value, and control the power error value or the voltage error value to be input into the PI controller for processing through a selection switch. Output the signal output by the PI controller to a gain amplifier for gain amplification processing, subtract the signal output by the gain amplifier from the d-axis current i 1d and output it to the PI controller for further processing. For u 1q -ω e i 1d L 1d subtract the signal from the signal after the PI controller processes it again, and perform a 2r / 2s transformation to obtain the β-axis component u of the first drive signal 1β . Among them, L 1d is the d-axis inductor. While obtaining the β-axis component u of the first drive signal 1β , subtract 0 from the q-axis current i 1q to obtain a current error signal, input the current error signal into the PI controller for processing, and subtract u 1d +ω e i 1q L 1q from the signal output by the PI controller, and perform a 2r / 2s transformation to obtain the α-axis component u of the first drive signal 1α . Among them, L 1q is the q-axis inductor.

[0069] In the embodiments of the present application, in the process of obtaining the α-axis component u of the second drive signal 2α and the β-axis component u of the second drive signal 2β , the following steps are performed: Subtract the power threshold P ref from the actual power P to obtain a power error value, subtract the voltage threshold U ref from the actual voltage U dc to obtain a voltage error value, control the power error value or the voltage error value to be input into the PI controller for processing through a selection switch, subtract the signal output by the PI controller from the d-axis current i 2d and output it to the PI controller for further processing. For u 2q -ω g i 2d subtract the L signal from the signal after the PI controller processes it again, and perform a 2r / 2s transformation to obtain the β-axis component u of the second drive signal 2β . Among them, L is the inductor. While obtaining the β-axis component u of the second drive signal 2β , subtract 0 from the q-axis current i 2q to obtain a current error signal, input the current error signal into the PI controller for processing, and subtract u 2d +ω g i 2qSubtract from the signal output by the L and PI controllers, and perform a 2r / 2s transformation to obtain the α-axis component u of the second drive signal 2α .

[0070] In an embodiment of the present application, in the process of obtaining the α-axis component u of the third drive signal 3α and the β-axis component u of the third drive signal 3β , the following steps are performed: Subtract the angular velocity ω of the outer rotor output by the electromagnetic coupler 130 from 0 to obtain an angular velocity error signal, input the angular velocity error signal into a PI controller for processing, output the signal output by the PI controller to a gain amplifier for gain amplification processing, subtract the signal output by the gain amplifier from the q-axis current i m , and output it to the PI controller for further processing. For the signal after the PI controller's further processing, ω 3q i m i 3d L 3d signals are added to ω m Flux signal, and a 2r / 2s transformation is performed to obtain the β-axis component u of the third drive signal 3β . Wherein, L 3d is the d-axis inductance, and Flux is the magnetic flux. When obtaining the β-axis component u of the third drive signal 3β , subtract the current threshold i ref from the i 3d signal, and input it into the PI controller for processing. Subtract the signal output by the PI controller from ω m i 3q L 3q signal, and perform a 2r / 2s transformation to obtain the α-axis component u of the three-drive signal 3α。

[0071] In summary, through the fault-tolerant operation scheme of the inertia flywheel system provided above, according to the power grid fault judgment result, the embodiment of the present application uses the power grid or the UPS motor to supply power to the electromagnetic coupler through the power conversion unit, enabling the system to still complete normal functions when the power grid fails, enhancing the fault tolerance and reliability of the system.

[0072] The embodiment of the present application also provides a fault-tolerant operation device for an inertia flywheel system, which can perform fault-tolerant operation by using the aforementioned fault-tolerant operation method 300 of the inertia flywheel system, or can also perform fault-tolerant operation by using other methods, which are not limited in this application.

[0073] Figure 7 Shows a schematic diagram of the composition of the fault-tolerant operation device for the inertia flywheel system according to the embodiment of the present application.

[0074] As Figure 7As shown, the device 700 includes a judgment module 710 and an execution module 720. In the embodiments of the present application, the judgment module 710 and the execution module 720 may be separate units or integrated in an integrated circuit, and the present application does not limit this here.

[0075] Specifically, the judgment module 710 is used to judge whether a power grid fault has occurred by using the power grid fault occurrence conditions.

[0076] Specifically, the execution module 720 is used to supply power to the electromagnetic coupler through the power conversion unit in response to the power grid not having a fault, and supply power to the electromagnetic coupler through the UPS motor through the power conversion unit in response to the power grid having a fault.

[0077] When the device 700 performs fault tolerance operation by using the fault tolerance operation method 300 of the inertia flywheel system described above, the judgment module 710 executes the foregoing step S310, and the execution module 720 executes the foregoing step S320 and the foregoing step S330. The specific execution process can be referred to the foregoing, and will not be elaborated here.

[0078] The embodiments of the present application also provide an electronic device.

[0079] Figure 8 The composition schematic diagram of the electronic device in the embodiments of the present application is shown.

[0080] As Figure 8 shown, the electronic device 800 includes a processor 810 and a memory 820. The memory 820 stores a computer program. Wherein, when the computer program is executed by the processor 810, the processor 810 executes the foregoing fault tolerance operation method 300 of the inertia flywheel system.

[0081] In addition, the embodiments of the present application also provide a readable storage medium, on which computer-readable instructions are stored. When the instructions are executed by a processor, the processor executes the foregoing fault tolerance operation method 300 of the inertia flywheel system.

[0082] Although multiple embodiments of the present application have been shown and described herein, it is obvious to those skilled in the art that such embodiments are provided only by way of example. Those skilled in the art can think of many changes, alterations, and alternative ways without departing from the spirit and scope of the present application. It should be understood that various alternative solutions to the embodiments of the present application described herein can be adopted in the process of practicing the present application. The appended claims are intended to define the protection scope of the present application and thus cover equivalents or alternative solutions within the scope of these claims.

Claims

1. A fault-tolerant operation method of an inertia flywheel system, characterized in that: The method comprises: Using grid fault occurrence conditions to determine whether a grid fault occurs; In response to the grid not failing, using the grid to supply power to the electromagnetic coupler via the power conversion unit; In response to a power grid failure, a UPS motor is used to supply power to the electromagnetic coupler via a power conversion unit.

2. The fault-tolerant operation method of the inertia flywheel system according to claim 1, characterized in that: The electric energy conversion unit includes a first inverter, a second inverter, a DC bus and a rectifier. The first end of the first inverter is connected to the UPS motor, the first end of the second inverter and the second end of the first inverter are both connected to the DC bus, the second end of the second inverter is connected to the outer rotor of the electromagnetic coupler, and the rectifier is connected between the DC bus and the power grid.

3. The fault-tolerant operation method of the inertia flywheel system according to claim 1, characterized in that: The grid fault occurrence condition is that the voltage amplitude of the grid is not within the voltage amplitude threshold range, the voltage frequency is not within the voltage frequency threshold range, or the grid harmonic content is less than or equal to the harmonic content threshold.

4. The fault-tolerant operation method of the inertia flywheel system according to claim 2, characterized in that: In the process of the power grid supplying power to the electromagnetic coupler through the power conversion unit, the following steps are performed: Controlling the switch of the rectifier to close; Determine whether the output power of the UPS motor is 0; In response to the output power of the UPS motor being 0, controlling the switch of the first converter to be disconnected; In response to the output power of the UPS motor being not 0, the output power of the UPS motor is reduced until it is 0.

5. The fault-tolerant operation method of the inertia flywheel system according to claim 2, characterized in that: In the process of the UPS motor supplying power to the electromagnetic coupler through the power conversion unit, the following steps are performed: controlling a switch of the first converter to close; Determine whether the output power of the power grid is 0; In response to the output power of the power grid being 0, controlling the switch of the rectifier to be turned off; In response to the output power of the grid being not zero, the output power of the grid is reduced until it becomes zero.

6. A fault-tolerant operation device for an inertia flywheel system, characterized in that: The fault-tolerant operation method of the inertia flywheel system according to any one of claims 1 to 5 is used to perform fault-tolerant operation, the device comprising: A judgment module, used to judge whether a power grid fault occurs by using a power grid fault occurrence condition; The execution module is used to supply power to the electromagnetic coupler through the power conversion unit using the power grid in response to no power grid failure; and to supply power to the electromagnetic coupler through the power conversion unit using the UPS motor in response to power grid failure.

7. An electronic device, characterized in that: include: processor; A memory storing a computer program, wherein when the computer program is executed by the processor, the processor executes the method according to any one of claims 1 to 5.

8. A readable storage medium, characterized in that: Computer-readable instructions are stored thereon, and when the instructions are executed by a processor, the processor is caused to perform the method according to any one of claims 1-5.

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