Uninterrupted power supply (UPS) system based on inertia flywheel

Abstract

The utility model discloses a UPS power supply system based on an inertia flywheel. The UPS power supply system comprises an inertia flywheel module, a DC bus, a converter module, a transformer module, an excitation system, a first secondary device and a second secondary device. The inertia flywheel module is connected into a power grid; the direct-current bus is connected to the inertia flywheel module through the converter module; and the excitation system, the first secondary equipment, the second secondary equipment and the power grid are connected to the direct current bus through the transformer module and the converter module in sequence. By using the scheme of the utility model, when the inertia flywheel module operates normally, the inertia flywheel module can supply power to the excitation system, the first secondary equipment and the second secondary equipment, so as to realize complete self-power supply of the UPS power supply system. When the inertia flywheel module breaks down, power can be supplied to the direct-current bus from the power grid, and therefore it is guaranteed that even if the inertia flywheel module fails, power supply of the key load can be guaranteed.

Description

Technical Field

[0001] This utility model generally relates to the field of energy storage technology. More specifically, this utility model relates to a UPS power supply system based on an inertial flywheel. Background Technology

[0002] Uninterruptible power supply (UPS) systems provide continuous power in the event of mains power interruptions, voltage fluctuations, or instability, ensuring the normal operation of critical equipment. They also protect equipment, improve energy efficiency, and support intelligent management. These characteristics make them indispensable equipment in data centers, medical facilities, industrial production, and other fields.

[0003] In existing technologies, batteries are typically used as energy storage devices in UPS systems to provide power support for critical loads during grid outages. However, this method has several drawbacks: First, batteries have a limited lifespan and require periodic replacement, resulting in high maintenance costs; second, batteries are inefficient during charging and discharging, leading to significant energy loss; and third, battery performance is unstable in high or low temperature environments, potentially affecting system reliability.

[0004] In view of this, there is an urgent need to provide a UPS power supply system based on an inertia flywheel in order to overcome the limitations of traditional battery energy storage UPS systems, utilize a high-speed rotating inertia flywheel to store energy, and release it to power the load when needed. Utility Model Content

[0005] In order to at least solve one or more of the technical problems mentioned above, this utility model proposes a UPS power supply system based on an inertia flywheel in several aspects.

[0006] This utility model provides a UPS power supply system based on an inertia flywheel, comprising: an inertia flywheel module, a DC bus, a converter module, a transformer module, an excitation system, first secondary equipment, and second secondary equipment; the inertia flywheel module is connected to the power grid; the DC bus is connected to the inertia flywheel module through the converter module; the excitation system, the first secondary equipment, the second secondary equipment, and the power grid are sequentially connected to the DC bus through the transformer module and the converter module.

[0007] In some embodiments, the inertia flywheel module includes an energy storage flywheel, a first synchronous motor, an electromagnetic coupler, and a second synchronous motor; the electromagnetic coupler includes an inner rotor and an outer rotor, the inner rotor and the rotor of the first synchronous motor are both connected to the rotor of the energy storage flywheel through a first drive shaft, the rotor of the second synchronous motor is connected to the outer rotor through a second drive shaft, and the stator winding of the second synchronous motor is connected to the power grid.

[0008] In some embodiments, the first synchronous motor is a permanent magnet synchronous motor.

[0009] In some embodiments, the second synchronous motor is a conventional permanent magnet synchronous motor.

[0010] In some embodiments, the converter module includes a first synchronous motor-side converter, an electromagnetic coupler-side converter, an excitation system-side converter, a three-phase converter, a single-phase converter, and a grid-side converter; the DC bus is connected to the first synchronous motor through the first synchronous motor-side converter, the DC bus is connected to the electromagnetic coupler through the electromagnetic coupler-side converter, and the excitation system-side converter, the three-phase converter, the single-phase converter, and the grid-side converter are all connected to the DC bus.

[0011] In some embodiments, the transformer module includes an excitation transformer, a three-phase transformer, a single-phase transformer, and a grid-side transformer; the excitation system is connected to the excitation system-side converter through the excitation transformer, the first secondary equipment is connected to the three-phase converter through the three-phase transformer, the second secondary equipment is connected to the single-phase converter through the single-phase transformer, and the power grid is connected to the grid-side converter through the grid-side transformer.

[0012] In some embodiments, the first secondary device is a three-phase secondary device.

[0013] In some embodiments, the second secondary device is a single-phase secondary device.

[0014] The UPS power supply system based on an inertia flywheel, as described above, achieves complete self-powering by supplying power to the excitation system, primary and secondary equipment, and secondary equipment via the inertia flywheel module during normal operation. This eliminates the need for additional power supply to the secondary equipment by using the inertia flywheel module as the UPS power source. Furthermore, in the event of a fault in the inertia flywheel module, power can be supplied from the grid to the DC bus. This provides dual protection, ensuring power supply to critical loads even in the event of inertia flywheel module failure. Attached Figure Description

[0015] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0016] Figure 1A first exemplary composition diagram of a UPS power supply system based on an inertia flywheel according to an embodiment of the present invention is shown;

[0017] Figure 2 A second exemplary composition diagram of a UPS power supply system based on an inertia flywheel according to an embodiment of the present invention is shown;

[0018] Figure 3 A structural diagram of an electromagnetic coupler according to an embodiment of the present invention is shown. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be understood that the terms "comprising" and "including" used in the specification and claims of this utility model indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0021] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this specification and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0022] With increasing global emphasis on renewable energy, new energy systems (such as wind and solar power) have become a crucial component of reducing carbon emissions and achieving energy sustainability. However, compared to traditional fossil fuel-based power generation systems, the frequency stability of new energy systems faces challenges. Traditional fossil fuel-based power generation systems possess significant rotational inertia, which helps maintain grid frequency stability. However, new energy systems (such as wind and solar power) typically lack this rotational inertia because their power generation processes do not involve rotating mechanical components. When large-scale new energy systems are integrated into the grid, the lack of sufficient inertia to balance sudden load changes or power generation fluctuations can lead to grid frequency instability due to their volatility and unpredictability.

[0023] Existing technologies typically employ traditional synchronous condenser technology, chemical energy storage technology, and traditional flywheel energy storage technology to address the frequency issues of renewable energy sources. In this process, synchronous condenser technology regulates reactive power and provides a small amount of mechanical inertia when the grid voltage changes, while chemical energy storage technology or traditional flywheel energy storage technology outputs virtual inertia and active power through a grid-connected converter. However, using these technologies to solve the frequency problems of renewable energy sources involves highly complex coordination and control, and the overall construction cost is very high.

[0024] In view of this, the present application provides a UPS power supply system based on an inertia flywheel, which uses the inertia flywheel as a UPS power supply. Since the inertia flywheel has high mechanical inertia, it can output active and reactive power, combining all the advantages of synchronous condensers and flywheel energy storage systems. Moreover, it stores a large amount of energy and can be used as a power source to supply power to secondary equipment.

[0025] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0026] Figure 1 A first exemplary composition diagram of a UPS power supply system 100 based on an inertia flywheel according to an embodiment of the present invention is shown.

[0027] like Figure 1 As shown, the UPS power system 100 based on inertia flywheel includes an inertia flywheel module 110, a DC bus 120, a converter module 130, a transformer module 140, an excitation system 150, first secondary equipment 160, and second secondary equipment 170.

[0028] Specifically, the inertia flywheel module 110 is connected to the power grid 180. The DC bus 120 is connected to the inertia flywheel module 110 via the converter module 130. The excitation system 150, the first secondary equipment 160, the second secondary equipment 170, and the power grid 180 are connected to the DC bus 120 sequentially via the transformer module 140 and the converter module 130. Thus, when the inertia flywheel module is operating normally, it supplies power to the excitation system 150, the first secondary equipment 160, and the second secondary equipment 170, enabling the system to be fully self-powered. When the inertia flywheel module malfunctions and cannot supply power, the power grid 180 supplies power to the DC bus 120 via the transformer module 140 and the converter module 130.

[0029] The following is combined Figure 2The specific composition of the inertia flywheel module 110, converter module 130, and transformer module 140 is described, as well as the connection relationships between the specific components of the inertia flywheel module 110, converter module 130, and transformer module 140, and the connection relationships between the specific components of the inertia flywheel module 110, converter module 130, and transformer module 140 and the DC bus 120, excitation system 150, first secondary equipment 160, and second secondary equipment 170, respectively.

[0030] Figure 2 A second exemplary composition diagram of a UPS power supply system based on an inertia flywheel according to an embodiment of the present invention is shown.

[0031] like Figure 2 As shown, the inertia flywheel module 110 includes an energy storage flywheel 111, a first synchronous motor 112, an electromagnetic coupler 113, and a second synchronous motor 114. The converter module 130 includes a first synchronous motor-side converter 131, an electromagnetic coupler-side converter 132, an excitation system-side converter 133, a three-phase converter 134, a single-phase converter 135, and a grid-side converter 136. The transformer module 140 includes an excitation transformer 141, a three-phase transformer 142, a single-phase transformer 143, and a grid-side transformer 144.

[0032] The specific structure of the electromagnetic coupler 113 in the embodiments of this application can be found in [reference needed]. Figure 3 .

[0033] like Figure 3 As shown, the electromagnetic coupler 113 includes an outer rotor 1131 and an inner rotor 1132. The inner rotor 1132 is made of permanent magnets, and the outer rotor 1131 is equipped with an armature winding. The electromagnetic coupler 113 is equivalent to a permanent magnet synchronous motor in which the stator and rotor rotate simultaneously.

[0034] In the embodiments of this application, the inner rotor 1132 and the rotor of the first synchronous motor 112 are both connected to the rotor of the energy storage flywheel 111 through the first transmission shaft 115, the rotor of the second synchronous motor 114 is connected to the outer rotor 1131 through the second transmission shaft 116, and the stator winding of the second synchronous motor 114 is connected to the power grid 180.

[0035] The inner rotor 1132 of the electromagnetic coupler 113 and the rotor of the first synchronous motor 112 are both connected to the rotor of the energy storage flywheel 111 via the first transmission shaft 115, so that the inner rotor 1132 of the electromagnetic coupler 113, the first synchronous motor 112 and the rotor of the energy storage flywheel 111 are coaxially connected. The inner rotor 1132 and the outer rotor 1131 of the electromagnetic coupler 113 are coupled to each other through electromagnetic action, so that the inertia flywheel module 110 of this application provides active power, reactive power and direct mechanical inertia support.

[0036] In the embodiments of this application, the frequency of the electrical energy generated by the second synchronous motor 114 is adjusted so that when the frequency of the electrical energy generated by the second synchronous motor 114 is consistent with the frequency of the power grid, it is connected to the power grid 180.

[0037] In the embodiments of this application, the first synchronous motor 112 is a permanent magnet synchronous motor, and the second synchronous motor 114 is a conventional permanent magnet synchronous motor.

[0038] In the embodiments of this application, the DC bus 120 is connected to the first synchronous motor 112 through the aforementioned first synchronous motor side converter 131, the DC bus 120 is connected to the electromagnetic coupler 113 through the aforementioned electromagnetic coupler side converter 132, and the excitation system side converter 133, three-phase converter 134, single-phase converter 135 and grid-side converter 136 are all connected to the DC bus 120.

[0039] Specifically, the first synchronous motor-side converter 131 converts the AC power output from the first synchronous motor 112 into DC power and outputs it to the DC bus 120. The electromagnetic coupler-side converter 132 converts the DC power output from the DC bus 120 into AC power and outputs it to the electromagnetic coupler 113. The excitation system-side converter 133 converts the DC power output from the DC bus 120 into AC power and outputs it to the excitation transformer 141. The three-phase converter 134 converts the DC power output from the DC bus 120 into AC power and outputs it to the three-phase transformer 142. The single-phase converter 135 converts the DC power output from the DC bus 120 into AC power and outputs it to the single-phase transformer 143.

[0040] In the embodiments of this application, the aforementioned excitation system 150 is connected to the excitation system-side converter 133 via an excitation transformer 141, the first secondary equipment 160 is connected to the three-phase converter 134 via a three-phase transformer 142, the second secondary equipment 170 is connected to the single-phase converter 135 via a single-phase transformer 143, and the power grid 180 is connected to the grid-side converter 136 via a grid-side transformer 144.

[0041] Specifically, excitation transformer 141 is used to convert the AC voltage output from excitation system-side converter 133 into the voltage required by excitation system 150. Three-phase transformer 142 is used to convert the AC voltage output from three-phase converter 134 into the voltage required by primary and secondary equipment 160. Single-phase transformer 143 is used to convert the AC voltage output from single-phase converter 135 into the voltage required by secondary equipment 170. Grid-side transformer 144 is used to convert the AC voltage output from grid 180 into the voltage required by DC bus 120, and then converts it into the current required by DC bus 120 through grid-side converter 136.

[0042] Since the DC bus 120 is connected to the first synchronous motor 112 through the aforementioned first synchronous motor side converter 131, and the grid-side converter 136 is connected to the DC bus 120, and the grid 180 is connected to the grid-side converter 136 through the grid-side transformer 144, it is possible to supply power to the DC bus 120 through the first synchronous motor 112 and to supply power to the DC bus 120 through the grid 180.

[0043] In the embodiments of this application, the aforementioned first secondary device 160 is a three-phase secondary device, and the aforementioned second secondary device 170 is a single-phase secondary device.

[0044] Through the above connections and the corresponding equipment type settings, the first synchronous motor 112 maintains a stable DC bus 120 voltage via the first synchronous motor-side converter 131, acting as the system's UPS power supply. The electromagnetic coupler 113 adjusts the frequency of the input current to its outer rotor 1131 via the electromagnetic coupler-side converter 132, allowing the inner rotor 1132 to accelerate and decelerate while maintaining a constant speed for the outer rotor 1131, thereby achieving the purpose of rotor energy storage and release for the energy storage flywheel 111. The excitation system 150 draws power from the DC bus 120 via the excitation system-side converter 133 and the excitation transformer 141. The DC bus 120 outputs 380V AC power via the three-phase converter 134 and the three-phase transformer 142 to power the first secondary equipment 160 in the system. The DC bus 120 outputs 220V single-phase AC power via the single-phase converter 135 and the single-phase transformer 143 to power the second secondary equipment 170 in the system. When the first synchronous motor 112 is operating normally, the excitation system 150, the first secondary equipment 160, and the second secondary equipment 170 in the system are all powered by the first synchronous motor 112, and the system can be fully self-powered. When the first synchronous motor 112 fails and cannot supply power to the system, the system can supply power to the DC bus 120 from the power grid 120 through the grid-side transformer 144 and the grid-side converter 136.

[0045] In summary, through the UPS power supply system based on the inertia flywheel described above, this embodiment of the invention achieves complete self-powering of the UPS power supply system by supplying power to the excitation system, the first secondary equipment, and the second secondary equipment through the inertia flywheel module during normal operation. This eliminates the need for additional power supply to the secondary equipment by using the inertia flywheel module as the UPS power source. Furthermore, in the event of a fault in the inertia flywheel module, power can be supplied from the grid to the DC bus. This provides dual protection, ensuring that critical loads are still powered even in the event of inertia flywheel module failure.

[0046] While various embodiments of the present invention have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and intent of the present invention. It should be understood that various alternatives to the embodiments of the present invention described herein may be employed in the practice of the present invention. The appended claims are intended to define the scope of protection of the present invention and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A UPS power supply system based on an inertial flywheel, characterized in that, include: Inertia flywheel module, DC bus, converter module, transformer module, excitation system, primary and secondary equipment, and secondary and secondary equipment; The inertia flywheel module is connected to the power grid; The DC bus is connected to the inertia flywheel module through the converter module; The excitation system, the first secondary equipment, the second secondary equipment, and the power grid are connected to the DC bus in sequence through the transformer module and the converter module.

2. The UPS power supply system based on an inertia flywheel according to claim 1, characterized in that, The inertia flywheel module includes an energy storage flywheel, a first synchronous motor, an electromagnetic coupler, and a second synchronous motor; The electromagnetic coupler includes an inner rotor and an outer rotor. The inner rotor and the rotor of the first synchronous motor are both connected to the rotor of the energy storage flywheel through a first drive shaft. The rotor of the second synchronous motor is connected to the outer rotor through a second drive shaft. The stator winding of the second synchronous motor is connected to the power grid.

3. The UPS power supply system based on an inertia flywheel according to claim 2, characterized in that, The first synchronous motor is a permanent magnet synchronous motor.

4. The UPS power supply system based on an inertia flywheel according to claim 2 or 3, characterized in that, The second synchronous motor is a common permanent magnet synchronous motor.

5. The UPS power supply system based on an inertia flywheel according to claim 2, characterized in that, The converter module includes a first synchronous motor-side converter, an electromagnetic coupler-side converter, an excitation system-side converter, a three-phase converter, a single-phase converter, and a grid-side converter; The DC bus is connected to the first synchronous motor through the first synchronous motor side converter, and the DC bus is connected to the electromagnetic coupler through the electromagnetic coupler side converter. The excitation system side converter, the three-phase converter, the single-phase converter, and the grid-side converter are all connected to the DC bus.

6. The UPS power supply system based on an inertia flywheel according to claim 5, characterized in that, The transformer module includes an excitation transformer, a three-phase transformer, a single-phase transformer, and a grid-side transformer; The excitation system is connected to the excitation system-side converter via the excitation transformer. The first secondary equipment is connected to the three-phase converter via the three-phase transformer. The second secondary equipment is connected to the single-phase converter via the single-phase transformer. The power grid is connected to the grid-side converter via the grid-side transformer.

7. The UPS power supply system based on an inertia flywheel according to claim 1 or 6, characterized in that, The first and second equipment are three-phase secondary equipment.

8. The UPS power supply system based on an inertia flywheel according to claim 7, characterized in that, The second secondary equipment is a single-phase secondary equipment.

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