Horizontal flywheel energy storage system

Abstract

The utility model relates to the technical field of power grids, and discloses a horizontal flywheel energy storage system, which is characterized in that a flywheel energy storage module is rigidly or flexibly connected with a rotor of a double-fed motor through a primary connector; a stator of the double-fed motor is electrically connected with an alternating current power grid; the system controller is electrically connected with the flywheel energy storage module, the primary connector and the double-feed motor; the flywheel energy storage module, the first-stage connector and the double-fed motor are all horizontally arranged, and the flywheel energy storage module is sealed in a vacuum mode. By adopting the horizontal arrangement, a larger and heavier flywheel rotor can be supported, so that the rotational inertia of the flywheel rotor is increased, and the capability of providing the rotational inertia for an alternating current power grid by the system is further improved; vacuum sealing is adopted, air resistance of a flywheel rotor of the flywheel energy storage module is reduced, energy conversion efficiency is improved, energy loss caused by air friction is avoided, the service life of the flywheel energy storage module is prolonged, corrosion of external air is avoided, and corrosion and oxidation of the flywheel rotor are reduced.

Description

Technical Field

[0001] This application relates to the field of power grid technology, and in particular to a horizontal flywheel energy storage system. Background Technology

[0002] With the gradual advancement of energy transformation, the proportion of new energy sources in the AC power grid is constantly increasing. However, the power electronic devices widely used in new energy technologies have drawbacks when connected to the grid. These devices are static and lack the rotating structure and rotational inertia of synchronous machines, making it difficult to actively provide voltage and frequency support and damping for the AC power grid. In particular, as the penetration rate of distributed energy in the power grid gradually increases, the rotational inertia of the AC power grid continues to decrease. When the load or power supply suddenly changes, the risk of frequency deviation increases, and the possibility of the system suffering from unbalanced power surges also increases, which puts enormous pressure on the safe and stable operation of the power system. Currently, vertical flywheel energy storage systems have been developed to solve this problem. However, vertical flywheel energy storage systems are supported by only one bearing, and this bearing has limited capacity to support the weight of the flywheel, resulting in insufficient rotational inertia provided by the system to the AC power grid.

[0003] Practical content

[0004] In view of this, this application provides a horizontal flywheel energy storage system to solve the technical problem that the existing vertical flywheel energy storage system is supported by only one bearing, which has a limited capacity to support the flywheel weight, resulting in insufficient rotational inertia provided by the system to the AC power grid.

[0005] This application proposes a horizontal flywheel energy storage system, which includes: a flywheel energy storage module, a connection module, a doubly fed motor, and a system controller. The connection module includes a primary connector.

[0006] The flywheel energy storage module is rigidly or flexibly connected to the rotor of the doubly fed motor via the primary connector;

[0007] The stator of the doubly fed motor is electrically connected to the AC power grid;

[0008] The system controller is electrically connected to the flywheel energy storage module, the primary connector, and the doubly fed motor;

[0009] The flywheel energy storage module, the primary connector, and the doubly fed motor are all horizontally arranged, and the flywheel energy storage module is vacuum sealed.

[0010] Furthermore, the connection module also includes a secondary connector, and the system controller is electrically connected to the secondary connector;

[0011] The secondary connector is connected between the flywheel energy storage module and the primary connector;

[0012] The secondary connector uses a permanent magnet continuously variable transmission or a gear transmission.

[0013] Furthermore, the primary connector is a coupling or a magnetic coupler.

[0014] Furthermore, the flywheel energy storage module includes a static structure and a rotating structure. The static structure includes a vacuum housing, a base frame, a front bearing assembly, a rear bearing assembly, a front gas seal assembly, and a rear gas seal assembly. The rotating structure is a flywheel rotor. The system controller is electrically connected to the flywheel rotor.

[0015] The vacuum housing is connected to the front gas seal assembly, the rear gas seal assembly, the front bearing assembly, and the rear bearing assembly flanges to form an integral component. The integral component is mounted on the base frame, and the flywheel rotor is mounted inside the vacuum housing.

[0016] The front bearing assembly is used to support the front shaft diameter of the flywheel rotor, and the rear bearing assembly is used to support the rear shaft diameter of the flywheel rotor.

[0017] The flywheel rotor is connected to the front bearing assembly via a vacuum seal through the front air seal assembly, and the front air seal assembly is used to connect the vacuum housing to the outer shell of the front bearing assembly;

[0018] The flywheel rotor is connected to the rear bearing assembly via a vacuum seal assembly, and the rear vacuum seal assembly is used to connect the vacuum housing to the outer shell of the rear bearing assembly.

[0019] Furthermore, the front bearing assembly, the rear bearing assembly, and the vacuum housing are all mounted on the base frame.

[0020] Furthermore, the flywheel energy storage module also includes: a front bearing housing guide slider and a vacuum housing guide slider, wherein the front bearing housing guide slider is installed between the base frame and the front bearing assembly, and the vacuum housing guide slider is installed between the base frame and the vacuum housing.

[0021] Furthermore, the flywheel rotor, the vacuum housing, the front gas seal assembly, the rear gas seal assembly, the front bearing assembly, and the rear bearing assembly are coaxially arranged.

[0022] Furthermore, the horizontal flywheel energy storage system also includes: a lubrication and cooling module, a first pipeline assembly, and a second pipeline assembly, wherein the system controller is electrically connected to the lubrication and cooling module;

[0023] The lubrication and cooling module is connected to the front bearing assembly via the first pipe assembly to provide a lubrication and cooling medium to the front bearing assembly;

[0024] The lubrication and cooling module is connected to the rear bearing assembly via the second pipe assembly to provide a lubrication and cooling medium to the rear bearing assembly.

[0025] Furthermore, the horizontal flywheel energy storage system also includes: a high-voltage top shaft module, a third pipeline assembly, and a fourth pipeline assembly, and the system controller is electrically connected to the high-voltage top shaft module;

[0026] The high-pressure jacking module is connected to the housing of the front bearing assembly through the third pipeline assembly to provide high-pressure jacking oil to the front bearing assembly. The oily medium provided by the high-pressure jacking module to the front bearing assembly is used to lift the front shaft of the flywheel rotor with a first pressure. The lubrication and cooling module provides the front bearing assembly with an oily medium at a second pressure.

[0027] The high-pressure jacking module is connected to the housing of the rear bearing assembly through the fourth pipe assembly to provide the rear bearing assembly with an oily medium at a first pressure. The oily medium provided by the high-pressure jacking module to the rear bearing assembly is used to lift the rear shaft of the flywheel rotor with the first pressure. The lubrication and cooling module provides the rear bearing assembly with an oily medium at a second pressure.

[0028] Wherein, the first pressure is greater than the second pressure.

[0029] Furthermore, the base frame, the flywheel rotor, the vacuum housing, the front bearing assembly, the rear bearing assembly, the front gas seal assembly, and the rear gas seal assembly are pre-assembled and transported as a single unit.

[0030] Furthermore, the horizontal flywheel energy storage system also includes: a vacuum module and a vacuum detector; the system controller is electrically connected to the vacuum module and the vacuum detector; the vacuum detector is used to detect the vacuum inside the flywheel energy storage module; the vacuum module is connected to the flywheel energy storage module to extract a vacuum from the flywheel energy storage module.

[0031] Implementing the embodiments of this application will have the following beneficial effects:

[0032] The horizontal flywheel energy storage system of this application includes: a flywheel energy storage module, a primary connector, a doubly-fed induction generator (DFIG), and a system controller. The flywheel energy storage module is rigidly or flexibly connected to the rotor of the DFIG via the primary connector. The stator of the DFIG is electrically connected to the AC power grid. The system controller is electrically connected to the flywheel energy storage module, the primary connector, and the DFIG. The flywheel energy storage module, the primary connector, and the DFIG are all horizontally arranged, and the flywheel energy storage module is vacuum-sealed. Compared to a vertical flywheel energy storage system, in this application, the flywheel energy storage module, the primary connector, and the DFIG are all horizontally arranged, which can support a larger and heavier flywheel rotor, increasing the rotational inertia of the flywheel rotor and thus improving the ability of the horizontal flywheel energy storage system to provide rotational inertia to the AC power grid. Furthermore, the flywheel energy storage module adopts vacuum sealing, which reduces the air resistance of the flywheel rotor, improves energy conversion efficiency, avoids energy loss caused by air friction, extends the service life of the flywheel energy storage module, and is not subject to external air corrosion, reducing the occurrence of rust and oxidation of the flywheel rotor. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] in:

[0035] Figure 1 This is a schematic diagram of the horizontal flywheel energy storage system of this application;

[0036] Figure 2 This is a structural schematic diagram of the horizontal flywheel energy storage system of this application from another angle;

[0037] Figure 3 This is a structural block diagram of a horizontal flywheel energy storage system in one embodiment.

[0038] Description of the main structural components of this application:

[0039] 1. Flywheel energy storage module; 10. Lubrication and cooling module; 11. Flywheel rotor; 111. Pressurizer; 12. Vacuum housing; 13. Housing support; 14. Front bearing assembly; 15. Rear bearing assembly; 16. Front air seal assembly; 17. Rear air seal assembly; 18. Base frame; 19. Vacuum module; 2. Connection module; 3. Doubly fed motor; 41. Motor control submodule; 8. AC power grid; Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0041] Please see Figures 1 to 3 In one embodiment, this application proposes a horizontal flywheel energy storage system, which includes: a flywheel energy storage module 1, a connection module 2, a doubly fed motor 3, and a system controller, wherein the connection module 2 includes a primary connector;

[0042] The flywheel energy storage module 1 is rigidly or flexibly connected to the rotor of the doubly fed motor 3 through the primary connector;

[0043] The stator of the doubly fed motor 3 is electrically connected to the AC power grid 8;

[0044] The system controller is electrically connected to the flywheel energy storage module 1, the primary connector, and the doubly fed motor 3;

[0045] The flywheel energy storage module 1, the primary connector, and the doubly fed motor 3 are all horizontally arranged, and the flywheel energy storage module 1 is vacuum sealed.

[0046] Compared to the vertical flywheel energy storage system 1, in this application, the flywheel energy storage module 1, the primary connector, and the doubly-fed motor 3 are all horizontally arranged, which can support a larger and heavier flywheel rotor 11, increasing the rotational inertia of the flywheel rotor 11 and thus improving the ability of the horizontal flywheel energy storage system to provide rotational inertia to the AC grid. Furthermore, the flywheel energy storage module 1 is vacuum-sealed, reducing air resistance of the flywheel rotor 11, improving energy conversion efficiency, avoiding energy loss due to air friction, extending the service life of the flywheel energy storage module 1, and preventing corrosion from external air, thus reducing rust and oxidation of the flywheel rotor 11.

[0047] The flywheel energy storage module 1, the primary connector, and the doubly fed motor 3 are all horizontally arranged, and the shafts of the flywheel energy storage module 1, the primary connector, and the doubly fed motor 3 are not perpendicular to the ground.

[0048] Doubly-fed motor 3 is both an unloaded doubly-fed motor and a doubly-fed generator without a prime mover. Doubly-fed motor 3 has energy storage, power generation, and phase regulation functions.

[0049] The system controller includes: a main control submodule, a flywheel control submodule, a motor control submodule 41, and a connection control submodule. The main control submodule controls the operation of the flywheel control submodule, the motor control submodule 41, and the connection control submodule. The flywheel control submodule controls the operation of the flywheel energy storage module 1. The connection control submodule controls the operation of the primary connector. The motor control submodule 41 controls the operation of the doubly-fed induction generator (DFIG) motor 3.

[0050] The motor control submodule 41 can be selected from existing technologies, which will not be elaborated here.

[0051] Optionally, the main control submodule, flywheel control submodule, motor control submodule 41 and connection control submodule can all be configured as independent structures (for example, by making them into independent chips and installing the chips in computer equipment or industrial control computers). The chip is obviously a type of hardware, and the chip, which is of the type of hardware, is installed in computer equipment or industrial control computers, which are of the type of hardware.

[0052] Please see Figure 3 and Figure 1 The machine-side converter in the doubly fed converter of the motor control submodule 41 is installed on the rotor side of the doubly fed motor 3, and the grid-side converter of the doubly fed converter is directly connected to the AC power grid 8.

[0053] The motor control submodule 41 is used to detect and receive signals, and control the doubly fed motor 3 to transfer inertia and energy to the AC power grid 8.

[0054] The working principle of the horizontal flywheel energy storage system is as follows: When the instantaneous frequency of the AC power grid 8 is greater than the preset rated frequency, the doubly-fed motor 3 draws electrical energy from the AC power grid 8 to increase the rotational speed of the flywheel rotor 11 of the flywheel energy storage module 1, thereby enabling the flywheel energy storage module 1 of the horizontal flywheel energy storage system to store energy; when the instantaneous frequency of the AC power grid 8 is not equal to the preset rated frequency, the doubly-fed motor 3 of the horizontal flywheel energy storage system is controlled to reduce the rotational speed of the flywheel rotor 11 of the flywheel energy storage module 1, thereby providing inertial support for the AC power grid 8.

[0055] Flywheel energy storage module 1 is a module that uses flywheel energy storage technology to store and release energy.

[0056] Flywheel energy storage technology is an energy storage technology that stores energy in the form of kinetic energy. It achieves energy storage / release by using an electric motor / generator to drive a rotor to accelerate / decelerate. The main advantages of flywheel energy storage are its rapid climbing ability, high energy conversion efficiency, and long service life. It also has unique advantages in providing ancillary services, such as inertia and frequency regulation. Furthermore, flywheels have no geographical limitations, can be easily installed, and are easy to promote and replicate on a large scale.

[0057] In one embodiment, the connection module 2 further includes a secondary connector, and the system controller is electrically connected to the secondary connector;

[0058] The secondary connector is connected between the flywheel energy storage module 1 and the primary connector;

[0059] The secondary connector employs a permanent magnet continuously variable transmission (CVT) or a gear transmission. By using a CVT or gear transmission in the secondary connector, the ratio between the flywheel rotor 11 speed and the doubly-fed motor 3 speed can be adjusted, resulting in greater flexibility and precision in adjusting this ratio. This allows for better adaptation to different working scenarios and requirements, optimizing the system's operating state. Secondly, it enables finer speed matching and control, improving the overall system efficiency and performance, and ensuring more efficient and stable energy transmission and conversion. Furthermore, this adjustable ratio provides more possibilities for system operation and optimization, helping to improve the system's adaptability and reliability, and expanding its application range and applicable environments.

[0060] In one embodiment, the primary connector employs a coupling or a magnetic coupler. The advantages of a coupling include: it can securely connect two shafts and transmit torque; it can compensate for shaft coaxiality and angular misalignment to a certain extent; and it can be used in various types of equipment and operating conditions. The advantages of a magnetic coupler include: reduced wear and mechanical failures, low maintenance costs; effective isolation of vibration transmission between the driving and driven shafts; automatic slippage under excessive load, providing protection; quiet operation; and good adaptability to harsh working environments. The use of a coupling or magnetic coupler in the primary connector improves the stability and reliability of the positive system.

[0061] In one embodiment, the flywheel energy storage module 1 includes a static structure and a rotating structure. The static structure includes a vacuum housing 12, a base frame 18, a front bearing assembly 14, a rear bearing assembly 15, a front air seal assembly 16, and a rear air seal assembly 17. The rotating structure is a flywheel rotor 11. The system controller is electrically connected to the flywheel rotor 11.

[0062] The vacuum housing 12 is flange-connected to the front gas seal assembly 16, the rear gas seal assembly 17, the front bearing assembly 14, and the rear bearing assembly 15 to form an integral component. The integral component is mounted on the base frame 18, and the flywheel rotor 11 is mounted inside the vacuum housing 12.

[0063] The front bearing assembly 14 is used to support the front shaft diameter of the flywheel rotor 11, and the rear bearing assembly 15 is used to support the rear shaft diameter of the flywheel rotor 11.

[0064] The flywheel rotor 11 is connected to the front bearing assembly 14 via the front air seal assembly 16, and the front air seal assembly 16 is used to connect the vacuum housing 12 to the outer shell of the front bearing assembly 14.

[0065] The flywheel rotor 11 is connected to the rear bearing assembly 15 via the rear air seal assembly 17, and the rear air seal assembly 17 is used to connect the vacuum housing 12 to the outer shell of the rear bearing assembly 15.

[0066] This embodiment utilizes the front bearing assembly 14 and the rear bearing assembly 15 to provide stable support, ensuring that the flywheel rotor 11 can rotate smoothly and stably, reducing friction and resistance during rotation, and improving energy conversion efficiency. Secondly, it helps to reduce wear and energy loss, extending the service life of the equipment. Furthermore, this support method can enhance the reliability and stability of the entire system operation, ensuring the performance of the flywheel energy storage device during operation. The flywheel rotor 11 is connected to the front bearing assembly 14 via the front air seal assembly 16, which connects the vacuum housing 12 to the outer shell of the front bearing assembly 14. The flywheel rotor 11 is connected to the rear bearing assembly 15 via the rear air seal assembly 17, which connects the vacuum housing 12 to the outer shell of the rear bearing assembly 15. This effectively holds the vacuum housing 12 in place, significantly reducing deformation of the vacuum housing 12 under atmospheric pressure, thus improving the vacuum housing 12's resistance to atmospheric pressure. The vacuum housing 12 increases the vacuum space for the flywheel rotor 11, reducing the wind resistance loss of the flywheel rotor 11.

[0067] The front bearing assembly 14 adopts any one of the following: sliding bearing, air bearing, and magnetic bearing.

[0068] The rear bearing assembly 15 adopts any one of the following: sliding bearing, air bearing, and magnetic bearing.

[0069] Sliding bearings operate under sliding friction. Air bearings are bearings that use gas pressure to suspend the shaft. Magnetic bearings, also known as electromagnetic levitation bearings or magnetic bearings, are a new type of high-performance bearing that uses magnetic force to suspend the rotor in the air.

[0070] Both the front air seal assembly 16 and the rear air seal assembly 17 are air seal assemblies.

[0071] The vacuum housing 12 has a cavity inside, which is a vacuum space, and the flywheel rotor 11 is located inside the cavity.

[0072] Optionally, the vacuum housing 12 is divided into an upper housing and a lower housing. The upper housing and the lower housing are combined to form a complete housing.

[0073] Optionally, the static structure includes: a housing support 13, which is mounted on the base frame 18 and located between the front bearing assembly 14 and the rear bearing assembly 15, and the vacuum housing 12 is mounted on the housing support 13.

[0074] The housing support 13 guides the vacuum housing 12 to expand radially to both sides when the vacuum housing 12 is heated and expands, keeping the housing coaxial with the flywheel rotor 11.

[0075] The shape and structure of the vacuum housing 12 and the housing support 13 can be set according to requirements, and will not be described in detail here.

[0076] A gas seal assembly is a device used to seal gases. It is typically used in equipment or systems that require controlling gas leaks or maintaining a specific gas environment. The specific structure and design of a gas seal assembly vary depending on the application. Its function is to prevent abnormal gas leakage at certain points, maintain the normal operation of the system, and ensure a specific gas state. A gas seal assembly may include seals, gaskets, sealing rings, and other structures.

[0077] The rotation seal of the vertical flywheel energy storage system 1 uses a rubber ring seal, which suffers from high contact friction loss and is prone to overheating and damage. To address this issue, the flywheel energy storage module 1, the primary connector, and the doubly-fed motor 3 of this application are all horizontally arranged. Furthermore, the vacuum seal of this application, while capable of supporting a larger and heavier flywheel rotor 11, also avoids the problems associated with using a rubber ring seal for the rotation seal of the vertical flywheel energy storage system 1.

[0078] Both the front bearing assembly 14 and the rear bearing assembly 15 employ sliding bearing assemblies. Sliding bearing assemblies are components that provide the common functions of sliding bearings. Sliding bearing assemblies can be selected from existing technologies according to requirements, and will not be elaborated upon here.

[0079] A sliding bearing is a bearing that operates under sliding friction. Sliding bearings operate smoothly, reliably, and quietly. Under liquid lubrication conditions, the sliding surfaces are separated by lubricating oil, preventing direct contact and significantly reducing friction loss and surface wear. The oil film also has a certain vibration-absorbing capacity. However, they have relatively high starting friction resistance.

[0080] In one embodiment, the front bearing assembly 14, the rear bearing assembly 15, and the vacuum housing 12 are all mounted on the base frame 18. The base frame 18 supports the sliding bearing assembly / flywheel rotor 11, the vacuum housing 12, etc., and fixes the installed and adjusted positions of each component.

[0081] The shape and structure of the base frame 18 can be set according to requirements, and will not be elaborated here.

[0082] Optionally, the doubly fed motor 3 is mounted on the base frame 18.

[0083] The base frame 18 is mounted on the ground, and the front bearing assembly 14, the rear bearing assembly 15 and the vacuum housing 12 are all mounted on the side of the base frame 18 away from the ground.

[0084] Optionally, the flywheel energy storage module 1 further includes: a first inclined shim, a second inclined shim, and a third inclined shim. The first inclined shim is disposed between the front bearing assembly 14 and the ground, the second inclined shim is disposed between the rear bearing assembly 15 and the ground, and the third inclined shim is disposed between the doubly fed motor 3 and the ground.

[0085] Optionally, the first, second, and third inclined shims are located between the base frame 18 and the ground.

[0086] In one embodiment, the flywheel energy storage module 1 further includes a front bearing housing guide slider and a vacuum housing guide slider. The front bearing housing guide slider is installed between the base frame 18 and the front bearing assembly 14, and the vacuum housing guide slider is installed between the base frame 18 and the vacuum housing 12. The front bearing housing guide slider and the vacuum housing guide slider allow the flywheel rotor 11 and the vacuum housing 12 to expand or contract axially during thermal expansion and contraction.

[0087] Both the front bearing housing guide slider and the vacuum housing guide slider use guide sliders. The guide slider can be selected from existing technologies according to requirements, which will not be elaborated here.

[0088] In one embodiment, the flywheel rotor 11, the vacuum housing 12, the front air seal assembly 16, the rear air seal assembly 17, the front bearing assembly 14, and the rear bearing assembly 15 are coaxially arranged. This coaxial arrangement ensures that the flywheel rotor 11 and other structures maintain a high degree of concentricity during rotation, reducing eccentricity and vibration, and improving operational accuracy and stability. This design not only adapts to temperature changes, reduces stress concentration, maintains structural integrity, and improves reliability, but also enhances operational accuracy, optimizes power transmission, strengthens overall structural integrity, reduces wear, and facilitates installation and maintenance.

[0089] The flywheel rotor 11, the vacuum housing 12, the front gas seal assembly 16, the rear gas seal assembly 17, the front bearing assembly 14, and the rear bearing assembly 15 are coaxially arranged, that is, the rotation axis of the flywheel rotor 11, the central axis of the vacuum housing 12, the rotation axis of the front bearing assembly 14, and the rotation axis of the rear bearing assembly 15 are all located on the same straight line.

[0090] In one embodiment, the horizontal flywheel energy storage system further includes: a lubrication and cooling module 10, a first pipe assembly, and a second pipe assembly, wherein the system controller is electrically connected to the lubrication and cooling module 10;

[0091] The lubrication and cooling module 10 is connected to the front bearing assembly 14 through the first pipe assembly to provide lubrication and cooling medium to the front bearing assembly 14;

[0092] The lubrication and cooling module 10 is connected to the rear bearing assembly 15 via the second pipe assembly to provide lubrication and cooling medium to the rear bearing assembly 15. The lubrication and cooling medium plays a crucial role, significantly reducing frictional losses caused by the mutual movement of structures, making equipment operation smoother and more efficient. Simultaneously, it has excellent cooling effects, effectively removing heat generated by friction to prevent excessive temperature from adversely affecting the equipment, effectively maintaining stable operation within a suitable temperature range, extending the equipment's service life, and ensuring the reliable operation of the entire system.

[0093] Oil can be used as the lubricating and cooling medium.

[0094] The first piping assembly includes an oil inlet pipe and an oil outlet pipe. The oil inlet pipe connects the lubrication and cooling module 10 and the front bearing assembly 14 to supply lubrication and cooling medium to the front bearing assembly 14. The oil outlet pipe connects the lubrication and cooling module 10 and the front bearing assembly 14 to return the lubrication and cooling medium from the front bearing assembly 14 to the lubrication and cooling module 10. This provides a flowing lubrication and cooling medium to the front bearing assembly 14.

[0095] The second piping assembly includes an oil inlet pipe and an oil outlet pipe. The oil inlet pipe connects the lubrication and cooling module 10 and the rear bearing assembly 15 to supply lubrication and cooling medium to the rear bearing assembly 15. The oil outlet pipe connects the lubrication and cooling module 10 and the rear bearing assembly 15 to return the lubrication and cooling medium from the rear bearing assembly 15 to the lubrication and cooling module 10. This provides a flowing lubrication and cooling medium to the rear bearing assembly 15.

[0096] The lubrication and cooling module 10 includes a first storage structure and a first power structure. The system controller is electrically connected to the first power structure to control the first power structure to drive the lubrication and cooling medium in the first storage structure to the oil inlet pipe of the first pipeline assembly and the oil inlet pipe of the second pipeline assembly.

[0097] In one embodiment, the horizontal flywheel energy storage system further includes: a high-voltage top shaft module, a third pipeline assembly, and a fourth pipeline assembly, wherein the system controller is electrically connected to the high-voltage top shaft module;

[0098] The high-pressure jacking module is connected to the housing of the front bearing assembly 14 through the third pipeline assembly to provide high-pressure jacking oil to the front bearing assembly 14. The oily medium provided by the high-pressure jacking module to the front bearing assembly 14 is used to lift the front shaft of the flywheel rotor 11 with a first pressure. The lubrication and cooling module 10 provides the front bearing assembly 14 with an oily medium at a second pressure.

[0099] The high-pressure jacking module is connected to the housing of the rear bearing assembly 15 through the fourth pipe assembly to provide the rear bearing assembly 15 with an oily medium at a first pressure. The oily medium provided by the high-pressure jacking module to the rear bearing assembly 15 is used to lift the rear shaft of the flywheel rotor 11 with the first pressure. The lubrication and cooling module 10 provides the rear bearing assembly 15 with an oily medium at a second pressure.

[0100] Wherein, the first pressure is greater than the second pressure. An oily medium at the first pressure is supplied to the front bearing assembly 14, and an oily medium at the first pressure is supplied to the rear bearing assembly 15, thereby lifting the shaft of the flywheel rotor 11 and reducing friction.

[0101] Optionally, the third piping assembly includes an oil inlet pipe, in which case the third piping assembly shares an oil outlet pipe with the first piping assembly.

[0102] Optionally, the third pipeline assembly includes an oil inlet pipe and an oil outlet pipe, in which case the oil outlet pipe of the third pipeline assembly is set independently from the oil outlet pipe of the first pipeline assembly.

[0103] Optionally, the fourth pipeline assembly includes an inlet pipe and an outlet pipe, in which case the outlet pipe of the second pipeline assembly and the fourth pipeline assembly share an outlet pipe that is set independently.

[0104] The high-pressure jacking module includes a second storage structure and a second power structure. The system controller is electrically connected to the second power structure to control the second power structure to drive the oil medium in the second storage structure to the oil inlet pipes of the third and fourth pipeline components.

[0105] In another embodiment of this example, the high-pressure jacking module employs a pressure booster 111; the lubrication and cooling module 10 is connected to the housing of the front bearing assembly 14 via the third pipe assembly to provide the front bearing assembly 14 with an oily medium at a first pressure; the lubrication and cooling module 10 is connected to the housing of the rear bearing assembly 15 via the fourth pipe assembly to provide the rear bearing assembly 15 with an oily medium at a third pressure. The pressure booster 111 increases the pressure in the oil inlet pipe of the third pipe assembly, and the pressure booster 111 also increases the pressure in the oil inlet pipe of the fourth pipe assembly.

[0106] In one embodiment, the base frame 18, the flywheel rotor 11, the vacuum housing 12, the front bearing assembly 14, the rear bearing assembly 15, the front air seal assembly 16, and the rear air seal assembly 17 are pre-assembled and transported as a single unit. Pre-assembly followed by integrated transport solves on-site installation challenges and significantly improves efficiency.

[0107] In one embodiment, the horizontal flywheel energy storage system further includes a vacuum module 19 and a vacuum detector. The system controller is electrically connected to the vacuum module 19 and the vacuum detector. The vacuum detector is used to detect the vacuum inside the flywheel energy storage module 1. The vacuum module 19 is connected to the flywheel energy storage module 1 to evacuate the flywheel energy storage module 1. Evacuating the flywheel energy storage module 1 through the vacuum module 19 provides a basis for vacuum sealing of the flywheel energy storage module 1.

[0108] The vacuum module 19 may employ a vacuum pump to extract air from the accommodating cavity of the vacuum housing 12, thereby creating and maintaining a vacuum within the cavity. A vacuum detector is mounted on the inner wall of the accommodating cavity of the vacuum housing 12 to detect vacuum data within the cavity, using the detected data as vacuum detection data.

[0109] The above-disclosed embodiments are merely preferred embodiments of this application and should not be construed as limiting the scope of this application. Therefore, any equivalent variations made in accordance with the claims of this application shall still fall within the scope of this application.

Claims

1. A horizontal flywheel energy storage system, characterized in that, The horizontal flywheel energy storage system includes: a flywheel energy storage module, a connection module, a doubly fed motor, and a system controller. The connection module includes a primary connector. The flywheel energy storage module is rigidly or flexibly connected to the rotor of the doubly fed motor via the primary connector; The stator of the doubly fed motor is electrically connected to the AC power grid; The system controller is electrically connected to the flywheel energy storage module, the primary connector, and the doubly fed motor; The flywheel energy storage module, the primary connector, and the doubly fed motor are all horizontally arranged, and the flywheel energy storage module is vacuum sealed.

2. The horizontal flywheel energy storage system according to claim 1, characterized in that, The connection module further includes a secondary connector, and the system controller is electrically connected to the secondary connector; The secondary connector is connected between the flywheel energy storage module and the primary connector; The secondary connector uses a permanent magnet continuously variable transmission or a gear transmission.

3. The horizontal flywheel energy storage system according to claim 1, characterized in that, The primary connector is a coupling or a magnetic coupler.

4. The horizontal flywheel energy storage system according to claim 1, characterized in that, The flywheel energy storage module includes a static structure and a rotating structure. The static structure includes a vacuum shell, a base frame, a front bearing assembly, a rear bearing assembly, a front gas seal assembly, and a rear gas seal assembly. The rotating structure is a flywheel rotor. The system controller is electrically connected to the flywheel rotor. The vacuum housing is connected to the front gas seal assembly, the rear gas seal assembly, the front bearing assembly, and the rear bearing assembly flanges to form an integral component. The integral component is mounted on the base frame, and the flywheel rotor is mounted inside the vacuum housing. The front bearing assembly is used to support the front shaft diameter of the flywheel rotor, and the rear bearing assembly is used to support the rear shaft diameter of the flywheel rotor. The flywheel rotor is connected to the front bearing assembly via a vacuum seal through the front air seal assembly, and the front air seal assembly is used to connect the vacuum housing to the outer shell of the front bearing assembly; The flywheel rotor is connected to the rear bearing assembly via a vacuum seal assembly, and the rear vacuum seal assembly is used to connect the vacuum housing to the outer shell of the rear bearing assembly.

5. The horizontal flywheel energy storage system according to claim 4, characterized in that, The front bearing assembly, the rear bearing assembly, and the vacuum housing are all mounted on the base frame.

6. The horizontal flywheel energy storage system according to claim 5, characterized in that, The flywheel energy storage module further includes: a front bearing housing guide slider and a vacuum housing guide slider, wherein the front bearing housing guide slider is installed between the base frame and the front bearing assembly, and the vacuum housing guide slider is installed between the base frame and the vacuum housing.

7. The horizontal flywheel energy storage system according to claim 4, characterized in that, The flywheel rotor, the vacuum housing, the front air seal assembly, the rear air seal assembly, the front bearing assembly, and the rear bearing assembly are coaxially arranged.

8. The horizontal flywheel energy storage system according to claim 4, characterized in that, The horizontal flywheel energy storage system further includes: a lubrication and cooling module, a first pipeline assembly, and a second pipeline assembly; the system controller is electrically connected to the lubrication and cooling module. The lubrication and cooling module is connected to the front bearing assembly via the first pipe assembly to provide a lubrication and cooling medium to the front bearing assembly; The lubrication and cooling module is connected to the rear bearing assembly via the second pipe assembly to provide a lubrication and cooling medium to the rear bearing assembly.

9. The horizontal flywheel energy storage system according to claim 8, characterized in that, The horizontal flywheel energy storage system further includes: a high-voltage top shaft module, a third pipeline assembly, and a fourth pipeline assembly; the system controller is electrically connected to the high-voltage top shaft module. The high-pressure jacking module is connected to the housing of the front bearing assembly through the third pipeline assembly to provide high-pressure jacking oil to the front bearing assembly. The oily medium provided by the high-pressure jacking module to the front bearing assembly is used to lift the front shaft of the flywheel rotor with a first pressure. The lubrication and cooling module provides the front bearing assembly with an oily medium at a second pressure. The high-pressure jacking module is connected to the housing of the rear bearing assembly through the fourth pipe assembly to provide the rear bearing assembly with an oily medium at a first pressure. The oily medium provided by the high-pressure jacking module to the rear bearing assembly is used to lift the rear shaft of the flywheel rotor with the first pressure. The lubrication and cooling module provides the rear bearing assembly with an oily medium at a second pressure. Wherein, the first pressure is greater than the second pressure.

10. The horizontal flywheel energy storage system according to claim 5, characterized in that, The base frame, the flywheel rotor, the vacuum housing, the front bearing assembly, the rear bearing assembly, the front air seal assembly, and the rear air seal assembly are pre-assembled and transported as a single unit.

11. The horizontal flywheel energy storage system according to claim 1, characterized in that, The horizontal flywheel energy storage system further includes a vacuum module and a vacuum detector. The system controller is electrically connected to the vacuum module and the vacuum detector. The vacuum detector is used to detect the vacuum inside the flywheel energy storage module. The vacuum module is connected to the flywheel energy storage module to extract a vacuum from the flywheel energy storage module.

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