Flywheel energy storage device and electronic power system

Abstract

The utility model discloses a kind of flywheel energy storage devices and electronic power system, belong to electronic power technical field, flywheel energy storage device includes: motor unit, flywheel, first bidirectional conversion module, direct current interface module and alternating current interface module. Motor unit is connected with flywheel;The first end of first bidirectional conversion module is connected with motor unit, for realizing the conversion between direct current signal and alternating current signal;The first end of direct current interface module is suitable for being connected with direct current access equipment, the second end of direct current interface module is connected with the second end of first bidirectional conversion module;The first end of alternating current interface module is suitable for being connected with alternating current access equipment, the second end of alternating current interface module is connected with the second end of first bidirectional conversion module, for transmission alternating current signal and realize the conversion between alternating current signal and direct current signal. The flywheel energy storage device can be adapted direct current access equipment and alternating current access equipment, improve scene adaptability and universality, realize the energy storage application of multiple scenes, multiple forms.

Description

Technical Field

[0001] This utility model relates to the field of electronic power technology, and in particular to a flywheel energy storage device and an electronic power system. Background Technology

[0002] In related technologies, existing flywheel energy storage devices and supporting systems are generally only equipped with a single AC interface or a single DC interface. The electrical access method is singular and fixed, resulting in poor scenario adaptability and low equipment versatility, making it difficult to adapt to the energy storage application needs of multiple scenarios and forms. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a flywheel energy storage device that is adaptable to both DC and AC access devices, improving scenario adaptability and versatility, and enabling energy storage applications in multiple scenarios and forms.

[0004] The second objective of this invention is to propose an electronic power system.

[0005] To address the aforementioned problems, a first aspect of this utility model provides a flywheel energy storage device, comprising: The system comprises: a motor unit and a flywheel, wherein the motor unit is connected to the flywheel; a first bidirectional conversion module, wherein a first end of the first bidirectional conversion module is connected to the motor unit for converting between DC and AC signals; a DC interface module, wherein a first end of the DC interface module is adapted to be connected to a DC access device, and a second end of the DC interface module is connected to a second end of the first bidirectional conversion module for transmitting DC signals; and an AC interface module, wherein a first end of the AC interface module is adapted to be connected to an AC access device, and a second end of the AC interface module is connected to a second end of the first bidirectional conversion module for transmitting AC signals and converting between AC and DC signals.

[0006] According to the flywheel energy storage device of this utility model embodiment, the DC interface module is connected to the DC access device and the first bidirectional conversion module, which can transmit the DC signal from the DC access device to the first bidirectional conversion module; the AC interface module is connected to the AC access device and the first bidirectional conversion module, which can transmit AC signals and realize the conversion between AC signals and DC signals, and finally transmit the DC signal to the first bidirectional conversion module; the first bidirectional conversion module can convert the DC signal transmitted by the DC interface module or the AC interface module into an AC signal to control the motor unit, thereby adapting to DC access devices and AC access devices, improving scenario adaptability and versatility, and realizing energy storage applications in multiple scenarios and forms.

[0007] In some embodiments, the DC interface module includes: a DC positive interface and a DC negative interface, the DC positive interface and the DC negative interface being adapted to be connected to the DC access device, the DC positive interface and the DC negative interface also being connected to the second end of the first bidirectional conversion module for transmitting DC signals; and a first switch, the first switch being disposed between the DC positive interface and the second end of the first bidirectional conversion module for controlling the on / off state of the DC interface module.

[0008] In some embodiments, the DC interface module further includes: a first pre-charge unit, the first pre-charge unit including a first pre-charge switch and a first pre-charge resistor, a first end of the first pre-charge switch being connected to a first end of the first switch and the DC positive interface, a second end of the first pre-charge switch being connected to a first end of the first pre-charge resistor; and a second end of the first pre-charge resistor being connected to a second end of the first bidirectional conversion module and a second end of the first switch.

[0009] In some embodiments, the DC interface module further includes: a plurality of first air switches, the first ends of the plurality of first air switches being connected to the DC positive interface and the DC negative interface, the second ends of the plurality of first air switches being connected to the second end of the first bidirectional conversion module, and the plurality of first air switches being disconnected in the event of a short circuit or overload.

[0010] In some embodiments, the AC interface module includes: an AC interface adapted to be connected to the AC access device for transmitting AC signals; and a second bidirectional conversion module, wherein a first end of the second bidirectional conversion module is connected to the AC interface and a second end of the second bidirectional conversion module is connected to a second end of the first bidirectional conversion module for converting between AC signals and DC signals.

[0011] In some embodiments, the AC interface module further includes an active interface unit, the first end of which is connected to the AC interface, and the active interface unit is used to preprocess AC signals.

[0012] In some embodiments, the active interface unit includes: a second pre-charge unit, a first end of which is connected to the AC interface; a first filter unit, a first end of which is connected to a second end of the second pre-charge unit, and a second end of which is connected to a first end of the second bidirectional conversion module; and a second switch, a first end of which is connected to the AC interface and the first end of the second pre-charge unit, and a second end of which is connected to the first end of the first filter unit and the second end of the second pre-charge unit.

[0013] In some embodiments, the AC interface module further includes: a plurality of second air switches, the first end of which is connected to the AC interface, the second end of which is connected to the first end of the active interface unit, and the plurality of second air switches disconnecting in the event of a short circuit or overload.

[0014] In some embodiments, the flywheel energy storage device further includes a controller, which is connected to the motor unit, the first bidirectional conversion module, the DC interface module and the AC interface module, and is used to control the energy conversion between the DC access device and the flywheel energy storage device or to control the energy conversion between the AC access device and the flywheel energy storage device.

[0015] A second aspect of this utility model provides an electronic power system, including the flywheel energy storage device described in the above embodiments.

[0016] According to the electronic power system of this utility model embodiment, the DC interface module in the flywheel energy storage device is connected to the DC access device and the first bidirectional conversion module, which can transmit the DC signal from the DC access device to the first bidirectional conversion module; the AC interface module is connected to the AC access device and the first bidirectional conversion module, which can transmit AC signals and realize the conversion between AC signals and DC signals, and finally transmit the DC signal to the first bidirectional conversion module; the first bidirectional conversion module can convert the DC signal transmitted by the DC interface module or the AC interface module into an AC signal to control the motor unit, thereby adapting to DC access devices and AC access devices, improving scenario adaptability and versatility, and realizing multi-scenario and multi-form energy storage applications.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a flywheel energy storage device according to an embodiment of the present invention; Figure 2 This is a structural block diagram of a flywheel energy storage device according to an embodiment of the present invention; Figure 3 This is a schematic diagram showing the motor unit speed during discharge of a flywheel energy storage device according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the motor unit torque during discharge of a flywheel energy storage device according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the motor unit power during discharge of a flywheel energy storage device according to an embodiment of the present invention; Figure 6 This is a structural block diagram of a flywheel energy storage device according to an embodiment of the present invention; Figure 7 This is a structural block diagram of an electronic power system according to an embodiment of the present invention.

[0019] Figure label: Electronic power systems 200; Flywheel energy storage device 100; Motor unit 1; flywheel 2; first bidirectional conversion module 10; DC interface module 20; AC interface module 30; first switch KM5; first precharge unit 21; first precharge switch KM3; first precharge resistor R1; first air switch QF2; second bidirectional conversion module 31; active interface unit 32; second precharge unit 321; first filter unit 322; second switch KM1; second air switch QF1; controller 40. Detailed Implementation

[0020] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0021] Existing flywheel energy storage devices and supporting systems are generally only equipped with a single AC interface or a single DC interface. The electrical access method is singular and fixed, resulting in poor scenario adaptability and low equipment versatility, making it difficult to adapt to the energy storage application needs of multiple scenarios and forms.

[0022] To address the above issues, the first aspect of this utility model provides a flywheel energy storage device that can be adapted to both DC and AC access devices, improving scenario adaptability and versatility, and enabling energy storage applications in multiple scenarios and forms.

[0023] Flywheel energy storage devices are purely physical and mechanical energy storage equipment that rely on bidirectional conversion between electrical energy and rotational kinetic energy to achieve short-term high power and millisecond-level rapid response. When the flywheel energy storage device is charging, the grid power is driven by the converter to drive the bidirectional permanent magnet integrated motor as an electric motor, which drives the flywheel to rotate at high speed in the vacuum chamber, converting electrical energy into mechanical kinetic energy. The flywheel stores energy by rotating at high speed due to inertia. When the flywheel energy storage device is discharging, the flywheel inertia drives the motor to reverse and act as a generator, converting mechanical energy into electrical energy, which is then stabilized by the converter and connected to the grid or used to supply power to the load.

[0024] like Figure 1 As shown, the flywheel energy storage device 100 includes: a motor unit 1, a flywheel 2, a first bidirectional conversion module 10, a DC interface module 20, and an AC interface module 30.

[0025] The motor unit 1 is connected to the flywheel 2; the first end of the first bidirectional conversion module 10 is connected to the motor unit 1 to realize the conversion between DC signals and AC signals; the first end of the DC interface module 20 is adapted to be connected to a DC access device, and the second end of the DC interface module 20 is connected to the second end of the first bidirectional conversion module 10 to transmit DC signals; the first end of the AC interface module 30 is adapted to be connected to an AC access device, and the second end of the AC interface module 30 is connected to the second end of the first bidirectional conversion module 10 to transmit AC signals and realize the conversion between AC signals and DC signals.

[0026] Specifically, the flywheel energy storage device in this application is equipped with both a DC interface module 20 and an AC interface module 30. The flywheel 2 can be rotated at high speed by driving the motor unit 1 through the DC interface module 20, and the flywheel 2 can also be rotated at high speed by driving the motor unit 1 through the AC interface module 30.

[0027] The DC access device can be a DC microgrid, a DC energy storage bus, or a DC power device. The DC access device is connected to the DC interface module 20. When the DC access device supplies power to the flywheel energy storage device 100, the DC signal of the DC access device is transmitted to the first bidirectional conversion module 10 through the DC interface module 20. The first bidirectional conversion module converts the DC signal into an AC signal, thereby driving the motor unit 1 and causing the flywheel 2 to rotate at high speed. When the flywheel energy storage device 100 discharges, the high-speed rotation of the flywheel 2 drives the motor unit 1 to generate electricity. The AC signal is converted into a DC signal through the first bidirectional conversion module, and the DC signal is transmitted to the DC access device through the DC interface module 20.

[0028] The AC access device is connected to the AC interface module 30. When the AC access device supplies power to the flywheel energy storage device 100, the AC signal of the AC access device is converted into a DC signal through the AC interface module 30 and transmitted to the first bidirectional conversion module 10. The first bidirectional conversion module converts the DC signal into an AC signal, thereby driving the motor unit 1 and causing the flywheel 2 to rotate at high speed. When the flywheel energy storage device discharges, the high-speed rotation of the flywheel 2 drives the motor unit 1 to generate electricity. The AC signal is converted into a DC signal through the first bidirectional conversion module, and the DC signal is converted into an AC signal through the AC interface module 30 and transmitted to the AC access device.

[0029] For example, existing conventional flywheel energy storage devices and supporting systems are generally only equipped with a single AC interface, resulting in a fixed and limited electrical connection method. The equipment is only compatible with traditional AC grid connection scenarios and cannot directly connect to new power consumption units such as DC loads, DC microgrids, and DC energy storage buses, exhibiting poor scenario adaptability and low equipment versatility. To meet DC access requirements, additional power conversion equipment such as rectifiers and inverters must be installed, increasing system construction costs and floor space, as well as power losses and potential fault locations. The overall structural scalability is insufficient, making it difficult to adapt to the diverse and multi-form energy storage application needs of new power systems.

[0030] This application boasts enhanced interface compatibility, employing an integrated AC / DC dual-interface design that allows for direct connection of both AC and DC loads, significantly expanding the interface's adaptability. It offers broader operational adaptability, breaking the traditional limitation of AC grid connection. It can operate stably on a public AC power grid or be directly matched to special operating conditions such as DC microgrids, energy storage DC buses, and DC power equipment, meeting the diverse needs of different projects. The system offers superior versatility and scalability, eliminating the need for additional AC / DC conversion peripherals. The device's native dual-interface structure enables both access modes, reducing reliance on external auxiliary equipment and facilitating modular system upgrades and batch deployment across multiple scenarios. Furthermore, it offers greater configuration flexibility, allowing users to freely choose either AC or DC access based on site power supply conditions and load power type, reducing limitations on on-site wiring modifications and equipment installation.

[0031] According to the flywheel energy storage device of this utility model embodiment, the DC interface module is connected to the DC access device and the first bidirectional conversion module, which can transmit the DC signal from the DC access device to the first bidirectional conversion module; the AC interface module is connected to the AC access device and the first bidirectional conversion module, which can transmit AC signals and realize the conversion between AC signals and DC signals, and finally transmit the DC signal to the first bidirectional conversion module; the first bidirectional conversion module can convert the DC signal transmitted by the DC interface module or the AC interface module into an AC signal to control the motor unit, thereby adapting to DC access devices and AC access devices, improving scenario adaptability and versatility, and realizing energy storage applications in multiple scenarios and forms.

[0032] In some embodiments, such as Figure 1 As shown, the DC interface module 20 includes: a DC positive interface, a DC negative interface, and a first switch KM5.

[0033] The DC positive interface and the DC negative interface are suitable for connection to DC access equipment. The DC positive interface and the DC negative interface are also connected to the second end of the first bidirectional conversion module 10 for transmitting DC signals. The first switch KM5 is set between the DC positive interface and the second end of the first bidirectional conversion module 10 for controlling the on / off state of the DC interface module.

[0034] Specifically, the DC interface module 20 is equipped with a DC positive interface and a DC negative interface, which can supply power to the motor unit 1. A first switch KM5 is installed between the DC positive interface and the second terminal of the first bidirectional conversion module 10 to control the on / off state of the DC interface module. Since the DC interface module 20 and the AC interface module 30 have different conduction principles, they are mutually exclusive to ensure the safety of the circuit components. Therefore, when the DC interface module 20 is connected to a DC input device, the first switch KM5 is closed; when the AC interface module 30 is operating, the first switch KM5 is open.

[0035] In some embodiments, such as Figure 1 As shown, the DC interface module 20 also includes a first pre-charge unit 21.

[0036] The first pre-charge unit 21 includes a first pre-charge switch KM3 and a first pre-charge resistor R1. The first end of the first pre-charge switch KM3 is connected to the first end of the first switch KM5 and the DC positive interface. The second end of the first pre-charge switch KM3 is connected to the first end of the first pre-charge resistor R1. The second end of the first pre-charge resistor R1 is connected to the second end of the first bidirectional conversion module 10 and the second end of the first switch KM5.

[0037] Specifically, the first pre-charge unit 21 performs pre-charging before the first switch KM5 is closed to ensure no impact when the first switch KM5 is closed. In the DC interface module 20, before the first switch KM5 is closed, the first pre-charge switch KM3 is closed first. The current is limited by the first pre-charge resistor R1 to pre-charge the capacitor slowly. After the capacitor voltage reaches 90% to 95% of the bus voltage, the first switch KM5 is closed. At this time, the voltage difference is extremely small, and there is no impact when closing the circuit.

[0038] In some embodiments, such as Figure 1 As shown, the DC interface module 20 also includes: multiple first air switches QF2.

[0039] Specifically, the first terminals of multiple first air switches QF2 are connected to the DC positive and DC negative interfaces, and the second terminals of multiple first air switches are connected to the second terminal of the first bidirectional conversion module 10. The multiple first air switches QF2 disconnect in the event of a short circuit or overload. To ensure circuit safety during short circuits or overloads, multiple first air switches QF2 are provided at the DC positive and DC negative interfaces.

[0040] In some embodiments, such as Figure 1 As shown, the AC interface module 30 includes: an AC interface and a second bidirectional conversion module 31.

[0041] The AC interface is suitable for connection with AC access equipment and is used to transmit AC signals; the first end of the second bidirectional conversion module 31 is connected to the AC interface, and the second end of the second bidirectional conversion module 31 is connected to the second end of the first bidirectional conversion module 10, for realizing the conversion between AC signals and DC signals.

[0042] Specifically, after the AC interface is connected to the AC access device, the AC current flows into the second bidirectional conversion module 31, which rectifies the three-phase AC power into stable DC power; for example... Figure 1 As shown, the second bidirectional conversion module 31 is equipped with a three-phase fully controlled bridge (6 switching transistors). By controlling the conduction state of multiple switches, it realizes the conversion between AC and DC power, achieving active rectification / inversion. The second bidirectional conversion module 31 also includes multiple capacitors and resistors for filtering and stabilizing the bus voltage.

[0043] In some embodiments, such as Figure 1 As shown, the AC interface module 30 includes an active interface unit 32.

[0044] Specifically, the first end of the active interface unit 32 is connected to the AC interface. The active interface unit is used to preprocess the AC signal, thereby completing the front-end processing of AC voltage and current analog signals.

[0045] In some embodiments, such as Figure 1 As shown, the active interface unit 32 includes: a second precharge unit 321, a first filter unit 322, and a second switch KM1.

[0046] The first end of the second precharge unit 321 is connected to the AC interface; the first end of the first filter unit 322 is connected to the second end of the second precharge unit 321, and the second end of the first filter unit 322 is connected to the first end of the second bidirectional conversion module 31; the first end of the second switch KM1 is connected to the AC interface and the first end of the second precharge unit 321, and the second end of the second switch KM1 is connected to the first end of the first filter unit 322 and the second end of the second precharge unit 321.

[0047] Specifically, the second pre-charge unit 321 includes a switch KM2 and a resistor R2. The second pre-charge unit 321 performs pre-charging before the second switch KM1 is closed, ensuring no impact when the second switch KM1 is closed. In the AC interface module 30, before the second switch KM1 is closed, switch KM2 is closed first. The current is limited by resistor R2 for pre-charging, slowly charging the capacitor. After the capacitor voltage reaches 90%–95% of the bus voltage, the second switch KM1 is closed. At this point, the voltage difference is extremely small, and there is no impact when closing the circuit.

[0048] The first filtering unit 322 includes multiple inductors L1 and capacitors C1. Two sets of three-phase inductors L1 are placed on both sides of capacitors C1. The multiple capacitors C1 are connected in a delta configuration, with the ends connected to form a triangle. The three vertices are connected to the three-phase lines respectively. The multiple inductors L1 and capacitors C1 form a resonant circuit to filter harmonics of specific frequencies, absorb grid harmonics, and prevent harmonic amplification and capacitor overheating and bulging damage. The flywheel energy storage device 100 also includes multiple inductors L2 for filtering.

[0049] In some embodiments, such as Figure 1 As shown, the AC interface module 30 also includes: multiple second air switches QF1.

[0050] Specifically, the first terminals of multiple second air circuit breakers QF1 are connected to the AC interface, and the second terminals of multiple second air circuit breakers QF1 are connected to the first terminal of the active interface unit 32. The multiple second air circuit breakers QF1 disconnect in the event of a short circuit or overload. To ensure safety during short circuits or overloads, multiple second air circuit breakers QF1 are provided at the AC interface, and a second air circuit breaker QF1 is provided in each phase of the three-phase AC interface.

[0051] For example, such as Figure 2 As shown, when the DC interface supplies power to the flywheel energy storage device 100, the DC signal is transmitted to the first bidirectional conversion module 10 through the DC interface. The first bidirectional conversion module converts the DC signal into an AC signal, thereby driving the motor unit 1 and causing the flywheel 2 to rotate at high speed. When the AC interface supplies power to the flywheel energy storage device 100, the AC signal is preprocessed in the active interface unit 32 through the AC interface. The second bidirectional conversion module 31 converts the preprocessed AC signal into a DC signal and transmits the DC signal to the first bidirectional conversion module 10. The first bidirectional conversion module converts the DC signal into an AC signal, thereby driving the motor unit 1 and causing the flywheel 2 to rotate at high speed.

[0052] The discharge process of a flywheel energy storage device, such as Figure 3 As shown, during the flywheel discharge process, from time TI to T2, the motor unit speed continuously decreases, as... Figure 4 and Figure 5 As shown, both the motor torque and power become negative, which typically indicates braking or power generation. At time T1, the motor torque and power abruptly change from 0 to negative values, and then the negative values ​​gradually increase as the motor speed decreases (as shown by the downward curve in the figure). This indicates that the braking torque is opposite to the rotor rotation direction; as the speed decreases, the braking torque of the motor gradually increases to maintain the braking effect or power. Figures 3-5 As shown, the flywheel energy storage device can discharge normally after being powered by the DC interface module or the AC interface module, indicating that the DC interface module and the AC interface module are set up reasonably.

[0053] In some embodiments, such as Figure 6 As shown, the flywheel energy storage device 100 also includes a controller 40.

[0054] The controller 40 is connected to the motor unit 1, the first bidirectional conversion module 10, the DC interface module 20 and the AC interface module 30 through a control interface, and is used to control the energy conversion between the DC access device and the flywheel energy storage device 100 or to control the energy conversion between the AC access device and the flywheel energy storage device 100.

[0055] For example, existing flywheel energy storage devices employ a single AC interface hardware structure. The entire unit's wiring terminals, internal power distribution circuits, and installation architecture are all designed specifically for AC operation, lacking the hardware foundation for direct DC connection. The core technical difference of this application lies in the integrated deployment of both AC and DC interface modules within the flywheel energy storage device, along with an independent dual-circuit wiring structure and an integrated installation and fixing structure. This integrated dual-interface hardware layout enables the flywheel energy storage device to natively possess both AC and DC independent access capabilities, eliminating the need for external conversion devices. From both mechanical and electrical hardware perspectives, this design differs from the traditional single-AC interface architecture.

[0056] This application reduces retrofit costs and power loss by eliminating the need for purchasing and installing external conversion equipment such as rectifier cabinets and inverters. It also simplifies electrical links, reduces energy loss caused by multi-stage power conversion, and improves overall system efficiency. Expanding the application scope, it is widely adaptable to scenarios such as industrial parks, data centers, photovoltaic-storage DC-flexible power distribution systems, and remote DC power supply sites, overcoming the application limitations of traditional flywheel energy storage. Improving system operational stability involves simplifying the overall electrical topology and reducing potential faults from intermediate conversion equipment; dual interfaces provide access redundancy, allowing flexible switching in case of single-loop anomalies, ensuring continuous and reliable operation. Adapting to multi-energy coupling integration, it can directly link with DC energy units such as distributed photovoltaics and electrochemical energy storage, facilitating the construction of multi-energy complementary integrated energy storage systems that meet the needs of new power system development.

[0057] A second aspect of this utility model provides an electronic power system, such as... Figure 7 As shown, the electronic power system 200 includes a flywheel energy storage device 100.

[0058] According to the electronic power system of this utility model embodiment, the DC interface module in the flywheel energy storage device is connected to the DC access device and the first bidirectional conversion module, which can transmit the DC signal from the DC access device to the first bidirectional conversion module; the AC interface module is connected to the AC access device and the first bidirectional conversion module, which can transmit AC signals and realize the conversion between AC signals and DC signals, and finally transmit the DC signal to the first bidirectional conversion module; the first bidirectional conversion module can convert the DC signal transmitted by the DC interface module or the AC interface module into an AC signal to control the motor unit, thereby adapting to DC access devices and AC access devices, improving scenario adaptability and versatility, and realizing multi-scenario and multi-form energy storage applications.

[0059] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, substrate, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0060] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A flywheel energy storage device, characterized in that, include: A motor unit and a flywheel, wherein the motor unit is connected to the flywheel; A first bidirectional conversion module, the first end of which is connected to the motor unit, is used to realize the conversion between DC signals and AC signals; A DC interface module, wherein a first end of the DC interface module is adapted to be connected to a DC access device, and a second end of the DC interface module is connected to the second end of the first bidirectional conversion module for transmitting DC signals; An AC interface module, wherein a first end of the AC interface module is adapted to be connected to an AC access device, and a second end of the AC interface module is connected to the second end of the first bidirectional conversion module, for transmitting AC signals and realizing the conversion between AC signals and DC signals.

2. The flywheel energy storage device according to claim 1, characterized in that, The DC interface module includes: The device includes a positive DC interface and a negative DC interface, which are adapted to be connected to the DC access device. The positive DC interface and the negative DC interface are also connected to the second end of the first bidirectional conversion module for transmitting DC signals. A first switch is disposed between the DC positive interface and the second end of the first bidirectional conversion module, and is used to control the on / off state of the DC interface module.

3. The flywheel energy storage device according to claim 2, characterized in that, The DC interface module also includes: The first pre-charge unit includes a first pre-charge switch and a first pre-charge resistor. The first end of the first pre-charge switch is connected to the first end of the first switch and the DC positive interface. The second end of the first pre-charge switch is connected to the first end of the first pre-charge resistor. The second end of the first pre-charge resistor is connected to the second end of the first bidirectional conversion module and the second end of the first switch.

4. The flywheel energy storage device according to claim 3, characterized in that, The DC interface module also includes: Multiple first air switches are provided, with their first terminals connected to the DC positive interface and the DC negative interface, and their second terminals connected to the second terminal of the first bidirectional conversion module. The multiple first air switches disconnect in the event of a short circuit or overload.

5. The flywheel energy storage device according to claim 1, characterized in that, The communication interface module includes: An AC interface, adapted to be connected to the AC access device, for transmitting AC signals; The second bidirectional conversion module has a first end connected to the AC interface and a second end connected to the second end of the first bidirectional conversion module, and is used to convert between AC signals and DC signals.

6. The flywheel energy storage device according to claim 5, characterized in that, The communication interface module also includes: An active interface unit, the first end of which is connected to the AC interface, is used to preprocess AC signals.

7. The flywheel energy storage device according to claim 6, characterized in that, The active interface unit includes: The second pre-charge unit, the first end of which is connected to the AC interface; A first filtering unit, wherein a first end of the first filtering unit is connected to a second end of the second pre-charge unit, and a second end of the first filtering unit is connected to a first end of the second bidirectional conversion module; The second switch has its first end connected to the AC interface and the first end of the second precharge unit, and its second end connected to the first end of the first filter unit and the second end of the second precharge unit.

8. The flywheel energy storage device according to claim 6, characterized in that, The communication interface module also includes: A plurality of second air switches, the first end of which is connected to the AC interface, and the second end of which is connected to the first end of the active interface unit, wherein the plurality of second air switches disconnect in the event of a short circuit or overload.

9. The flywheel energy storage device according to any one of claims 1-8, characterized in that, The flywheel energy storage device also includes: The controller is connected to the motor unit, the first bidirectional conversion module, the DC interface module, and the AC interface module, and is used to control the energy conversion between the DC access device and the flywheel energy storage device or to control the energy conversion between the AC access device and the flywheel energy storage device.

10. An electronic power system, characterized in that, Includes the flywheel energy storage device as described in any one of claims 1-9.

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