Flywheel energy storage system integrating kinetic energy defense and auxiliary power supply and control method thereof

Abstract

The invention provides a flywheel energy storage system integrating kinetic energy defense and auxiliary power supply and a control method thereof, and relates to the technical field of flywheel energy storage, the system comprises a grid-side converter, a machine-side converter, a machine-side converter switch, a flywheel motor and an energy storage flywheel which are sequentially connected in series; the brake inverter is connected with the direct current side of the machine side converter; the brake resistor first switch is used for connecting the brake resistor and the brake inverter, and the brake resistor second switch is used for connecting the flywheel motor and the brake resistor; the auxiliary power supply first power switch is used for connecting a main power grid and an auxiliary power supply loop, the auxiliary power supply second power switch is used for connecting a standby power supply and the auxiliary power supply loop, and the auxiliary power supply third power switch is used for connecting a brake inverter and the auxiliary power supply loop; the flywheel energy storage auxiliary device is connected into the auxiliary power supply loop, and power is supplied to the flywheel energy storage auxiliary device by adjusting the working state of the flywheel energy storage system under different working conditions.

Description

Technical Field

[0001] This invention relates to the field of flywheel energy storage technology, and more particularly to a flywheel energy storage system and its control method that integrates kinetic energy defense and auxiliary power supply. Background Technology

[0002] Currently, flywheel energy storage systems, due to their high discharge response speed, high discharge power, long lifespan, non-degradable energy storage, high environmental adaptability, and high reliability, are being widely applied in fields such as rail transit and power grid frequency regulation. The power output of a single unit has exceeded megawatts, and the energy storage capacity has reached tens or even hundreds of kilowatt-hours. As the core component, the operational stability of the energy storage flywheel directly determines the reliability of the entire system.

[0003] In flywheel energy storage systems, when a high-speed flywheel experiences a drop failure due to mechanical instability or sudden grid changes, it is often desirable to reduce the flywheel speed from high to near zero as quickly as possible to minimize losses. During grid or flywheel converter failures, flywheel energy storage devices require kinetic energy defense measures to reduce the speed, rapidly decreasing the flywheel rotor's rotational speed to protect equipment and personnel. Kinetic energy defense typically achieves this by adding energy-dissipating resistors to the electrical system. Kinetic energy defense systems can be implemented by either directly connecting DC power to a braking resistor after inverting it via a braking inverter, or by directly connecting the braking resistor to the AC side of the flywheel motor. Because the speed decreases, the flywheel motor voltage decreases, and the braking inverter cannot consistently establish AC voltage. The former method cannot reduce the flywheel speed to zero, while the latter results in unstable voltage and low braking efficiency.

[0004] Flywheel energy storage devices require auxiliary equipment to operate, in addition to the flywheel motor, energy storage flywheel, and converter. Auxiliary equipment requiring uninterrupted power supply includes the magnetic bearing drive system, flywheel control system, and fire control system; auxiliary equipment that can be interrupted for short periods (seconds) but requires continuous power supply includes the converter cooling system and flywheel cooling system. The reliability of the power supply to the auxiliary equipment also affects the reliability of the flywheel energy storage system. Existing solutions typically rely on independent UPS systems or backup power supplies, resulting in large auxiliary power supply capacity and increased costs.

[0005] In view of the above-mentioned existing technologies, there is an urgent need for a technical solution for flywheel energy storage devices that can overcome the shortcomings of existing technologies and organically combine the kinetic energy defense system and the auxiliary power supply system. Summary of the Invention

[0006] To address the problems existing in the prior art, this invention proposes a flywheel energy storage system and its control method that integrates kinetic energy defense and auxiliary power supply. This application integrates the kinetic energy defense system and auxiliary power supply system of the flywheel energy storage device, which reduces energy waste and lowers the backup power capacity requirement of the auxiliary power supply system.

[0007] In a first aspect of this invention, a flywheel energy storage system integrating kinetic energy defense and auxiliary power supply is proposed. This system includes: a grid-side converter, a machine-side converter, a braking inverter, a first auxiliary power supply switch, a second auxiliary power supply switch, a third auxiliary power supply switch, a first braking resistor switch, a second braking resistor switch, a machine-side converter switch, a flywheel motor, and an energy storage flywheel; wherein...

[0008] The grid-side converter, the machine-side converter, the machine-side converter switch, the flywheel motor, and the energy storage flywheel are connected in series in sequence.

[0009] The braking inverter is connected to the DC side of the machine-side converter;

[0010] The first switch of the braking resistor is used to connect the braking resistor and the braking inverter, and the second switch of the braking resistor is used to connect the flywheel motor and the braking resistor.

[0011] The first auxiliary power supply switch is used to connect the main power grid and the auxiliary power supply circuit; the second auxiliary power supply switch is used to connect the backup power supply and the auxiliary power supply circuit; and the third auxiliary power supply switch is used to connect the braking inverter and the auxiliary power supply circuit.

[0012] The flywheel energy storage auxiliary equipment is connected to the auxiliary power supply circuit, and the flywheel energy storage auxiliary equipment is powered by adjusting the working state of the flywheel energy storage system under different operating conditions.

[0013] In a second aspect of the present invention, a flywheel energy storage control method integrating kinetic energy defense and auxiliary power supply is proposed. This control method is executed based on a flywheel energy storage system integrating kinetic energy defense and auxiliary power supply; wherein the method includes:

[0014] During normal operation of the flywheel energy storage system, the grid-side converter controls the power, the machine-side converter controls the DC voltage, the flywheel energy storage auxiliary equipment is powered by the main grid, and the main grid and the energy storage flywheel interact with each other.

[0015] When a shutdown order is received, and the main power grid, grid-side converter, and generator-side converter are all normal, the energy storage flywheel releases electricity to the main power grid and slows down, while simultaneously supplying power to the flywheel energy storage auxiliary equipment through the braking inverter.

[0016] When the main grid or grid-side converter fails, but the generator-side converter is normal, the energy storage flywheel supplies power to the flywheel energy storage auxiliary equipment through the braking inverter. The braking resistor brakes the flywheel motor through the braking inverter. The generator-side converter controls the DC voltage. The braking inverter operates in V / f (constant AC voltage and frequency) control mode. By adjusting the switching on and off of the braking resistor, the power consumption is changed so that the power supply is prioritized to meet the power supply needs of the flywheel energy storage auxiliary equipment.

[0017] In the event of a fault in the machine-side converter, the braking resistor is directly connected to the flywheel motor via the second braking resistor switch to brake the flywheel motor; if the second power grid is normal, the main power grid supplies power; if the second power grid is abnormal, the backup power supply supplies power.

[0018] This application presents a flywheel energy storage system and its control method that integrates kinetic energy defense and auxiliary power supply. By constructing an integrated flywheel energy storage system hardware architecture that combines kinetic energy defense and auxiliary power supply, and with the precise configuration of multiple power switches and braking switches, combined with full-condition collaborative control logic covering normal operation, shutdown, and different fault scenarios of the main grid / converter, it not only realizes the recovery and utilization of kinetic energy during flywheel braking, converting the deceleration kinetic energy into electrical energy for auxiliary equipment, reducing energy waste, but also reduces configuration costs through the precise matching design of backup power supply power and duration. At the same time, through the uninterruptible power supply guarantee of uninterruptible equipment and the smooth switching between braking mode and power supply mode under different operating conditions, it effectively improves the system's fault tolerance, operational stability, and safety protection level under complex operating conditions, achieving the dual goals of safe flywheel braking and continuous and reliable power supply to auxiliary equipment. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of a flywheel energy storage system architecture that integrates kinetic energy defense and auxiliary power supply according to an embodiment of the present invention.

[0021] Figure 2 This is a flowchart illustrating a flywheel energy storage control method that integrates kinetic energy defense and auxiliary power supply according to an embodiment of the present invention.

[0022] Figure 3 This is a flowchart illustrating another embodiment of the flywheel energy storage control method that integrates kinetic energy defense and auxiliary power supply according to the present invention. Detailed Implementation

[0023] The principles and spirit of the invention will now be described with reference to several exemplary embodiments. It should be understood that these embodiments are given merely to enable those skilled in the art to better understand and implement the invention, and are not intended to limit the scope of the invention in any way. Rather, these embodiments are provided to make this disclosure more thorough and complete, and to fully convey the scope of this disclosure to those skilled in the art.

[0024] Those skilled in the art will recognize that embodiments of the present invention can be implemented as a system, apparatus, device, method, or computer program product. Therefore, this disclosure can be specifically implemented in the following forms: entirely hardware, entirely software (including firmware, resident software, microcode, etc.), or a combination of hardware and software.

[0025] According to an embodiment of the present invention, a flywheel energy storage system integrating kinetic energy defense and auxiliary power supply and its control method are proposed, relating to the field of flywheel energy storage technology.

[0026] The principles and spirit of the present invention will be explained in detail below with reference to several representative embodiments.

[0027] Figure 1 This is a schematic diagram of a flywheel energy storage system architecture that integrates kinetic energy defense and auxiliary power supply according to an embodiment of the present invention. Figure 1 As shown, the system includes: a grid-side converter, a machine-side converter, a braking inverter, an auxiliary power supply first power switch KM21, an auxiliary power supply second power switch KM22, an auxiliary power supply third power switch KM23, a braking resistor first switch KM3, a braking resistor second switch KM4, a machine-side converter switch KM5, a flywheel motor, and an energy storage flywheel; among which,

[0028] The grid-side converter, the machine-side converter, the machine-side converter switch KM5, the flywheel motor, and the energy storage flywheel are connected in series in sequence.

[0029] The braking inverter is connected to the DC side of the machine-side converter;

[0030] The first switch KM3 of the braking resistor is used to connect the braking resistor and the braking inverter, and the second switch KM4 of the braking resistor is used to connect the flywheel motor and the braking resistor.

[0031] The auxiliary power supply first power switch KM21 is used to connect the main power grid and the auxiliary power supply circuit, the auxiliary power supply second power switch KM22 is used to connect the backup power supply and the auxiliary power supply circuit, and the auxiliary power supply third power switch KM23 is used to connect the braking inverter and the auxiliary power supply circuit; wherein, the main power grid is the main power grid.

[0032] The flywheel energy storage auxiliary equipment is connected to the auxiliary power supply circuit, and the flywheel energy storage auxiliary equipment is powered by adjusting the working state of the flywheel energy storage system under different operating conditions.

[0033] This invention clarifies the core components and connections of a flywheel energy storage system, constructing an integrated hardware architecture for kinetic energy defense and auxiliary power supply, enabling flexible connection between the braking circuit and the auxiliary power supply circuit. Through the coordinated configuration of multiple power switches and braking switches, hardware support is provided for power supply switching and braking mode conversion under different operating conditions, effectively integrating braking and auxiliary power supply functions, improving system integration, reducing additional hardware configuration costs, and ensuring the foundation for the coordinated operation of all core components.

[0034] In one embodiment, the flywheel energy storage auxiliary device is connected to the auxiliary power supply circuit via switch KM1. The flywheel energy storage auxiliary device includes an interruptible power supply flywheel energy storage auxiliary device and an uninterruptible power supply flywheel energy storage auxiliary device.

[0035] The uninterruptible power supply equipment is equipped with a UPS (Uninterruptible Power Supply) to provide uninterrupted power supply.

[0036] Interruptible power supply flywheel energy storage auxiliary equipment is equipment that can withstand brief interruptions and requires continuous power supply.

[0037] Equipment that requires continuous power supply even during brief interruptions includes inverter cooling systems and flywheel cooling systems.

[0038] Devices that require continuous power supply but have brief interruptions can achieve second-level interruptions.

[0039] By classifying flywheel energy storage auxiliary equipment and configuring UPS power supplies for uninterruptible power equipment, differentiated power supply protection for auxiliary equipment is achieved. This ensures the uninterrupted operation of critical equipment such as magnetic bearing drive systems and control systems, preventing equipment damage or system failure due to power outages, while also rationally differentiating power supply priorities to avoid resource waste caused by over-supply, thus improving the reliability and rationality of the auxiliary power supply system.

[0040] In one embodiment, the minimum configured power of the backup power supply is equal to the sum of the power of the flywheel main engine electromagnetic bearing, vacuum system, flywheel motor cooling system, and braking resistor fan; the continuous power supply duration of the backup power supply is not less than the braking duration of the flywheel unit; the backup power supply is a second power grid, energy storage system, or diesel generator.

[0041] This invention clarifies the configuration parameters (minimum power, continuous power supply duration) and selectable types of backup power supplies, achieving precise adaptation design for backup power supplies. The minimum power is matched to the sum of the power consumption of core auxiliary equipment, and the continuous power supply duration is matched to the flywheel braking duration, avoiding increased costs due to over-configuration of backup power supplies. Multiple backup power supply types are available to adapt to different application scenarios, while ensuring uninterrupted power supply to auxiliary equipment during braking, balancing system economy and power supply reliability.

[0042] The flywheel energy storage control method proposed in this invention, which integrates kinetic energy defense and auxiliary power supply, will be described in detail below, taking into account the flywheel energy storage system that integrates kinetic energy defense and auxiliary power supply. This control method is implemented based on the above-mentioned system, and refers to... Figure 2 Specific control methods include:

[0043] S110, when the flywheel energy storage system is operating normally, the grid-side converter controls the power, the machine-side converter controls the DC voltage, the flywheel energy storage auxiliary equipment is powered by the main grid, and the main grid and the energy storage flywheel interact with each other.

[0044] S120: When a shutdown command is received and the main power grid, grid-side converter and generator-side converter are all normal, the energy storage flywheel releases electricity to the main power grid and slows down, while simultaneously supplying power to the flywheel energy storage auxiliary equipment through the braking inverter.

[0045] S130: In the event of a main grid fault or grid-side converter fault, and the generator-side converter is normal, the energy storage flywheel supplies power to the flywheel energy storage auxiliary equipment through the braking inverter. The braking resistor brakes the flywheel motor through the braking inverter. The generator-side converter controls the DC voltage. The braking inverter operates in V / f (constant AC voltage and frequency) control mode. By adjusting the switching on and off of the braking resistor, the power consumption is changed so that the power supply is prioritized for the flywheel energy storage auxiliary equipment.

[0046] S140, in the event of a fault in the machine-side converter, the braking resistor is directly connected to the flywheel motor through the second switch of the braking resistor to brake the flywheel motor; if the second power grid is normal, it is powered by the main power grid; if the second power grid is abnormal, it is powered by the backup power supply.

[0047] The flywheel energy storage control method proposed in this invention, which integrates kinetic energy defense and auxiliary power supply, can propose full-condition control logic based on the aforementioned system to achieve coordinated control of kinetic energy defense and auxiliary power supply. During normal operation, it ensures smooth energy exchange. In shutdown and fault conditions, intelligent switching between braking and power supply modes achieves both safe braking of the flywheel and recovery of flywheel kinetic energy to power auxiliary equipment, reducing energy waste. Differentiated control strategies are formulated for different fault scenarios (main grid / grid-side converter fault, generator-side converter fault), improving the system's fault tolerance and operational stability under complex conditions.

[0048] Further reference Figure 3 Detailed control methods include:

[0049] S110: When the flywheel energy storage system is operating normally, the grid-side converter controls the power, the generator-side converter controls the DC voltage, the flywheel energy storage auxiliary equipment is powered by the main grid, and the main grid and the energy storage flywheel interact with each other.

[0050] In this step, switch KM1 is closed; auxiliary power supply first power switch KM21 is closed, auxiliary power supply second power switch KM22 is open, auxiliary power supply third power switch KM23 is open, braking resistor first switch KM3 is open, braking resistor second switch KM4 is open, and machine-side converter switch KM5 is closed.

[0051] This embodiment clarifies the operating status of each switch under normal operating conditions, achieving standardized operation control under normal conditions. Through precise coordination of the switches, the main power grid stably supplies power to auxiliary equipment. The grid-side converter and the generator-side converter each perform their respective functions (power control, DC voltage control), ensuring efficient and smooth energy exchange between the main power grid and the energy storage flywheel. This avoids operational disturbances caused by component malfunctions, improving the stability and efficiency of the system's normal operation.

[0052] S120: Upon receiving a shutdown command, and with the main power grid, grid-side converter, and generator-side converter all functioning normally, the energy storage flywheel releases electricity to the main power grid and slows down, while simultaneously supplying power to the flywheel energy storage auxiliary equipment via a braking inverter.

[0053] In this step, switch KM1 is closed; auxiliary power supply first power switch KM21 is opened, auxiliary power supply second power switch KM22 is opened, auxiliary power supply third power switch KM23 is closed, braking resistor first switch KM3 is opened, braking resistor second switch KM4 is opened, and machine-side converter switch KM5 is closed.

[0054] This embodiment defines the switching logic under normal shutdown conditions, realizing energy recovery and auxiliary power supply guarantee during shutdown. By closing the auxiliary power supply third power switch and disconnecting the main grid power supply switch, the braking inverter converts the kinetic energy of the flywheel during deceleration into electrical energy for the auxiliary equipment, reducing energy loss during shutdown; at the same time, it ensures coordinated operation of various components, avoids power supply switching conflicts, and improves the economy and reliability of the shutdown process.

[0055] S122, when the speed of the energy storage flywheel decreases to the point where the AC voltage cannot be stabilized, the power supply to the flywheel energy storage auxiliary equipment through the braking inverter is stopped; if the main grid is normal, the main grid will supply power; if the main grid is abnormal, the backup power supply will supply power.

[0056] In this step, switch KM1 is closed; when the main power grid is normal, auxiliary power supply first power switch KM21 is closed; when the main power grid is abnormal, auxiliary power supply second power switch KM22 is closed, auxiliary power supply third power switch KM23 is open; braking resistor first switch KM3 is open, braking resistor second switch KM4 is open, and generator-side converter switch KM5 is closed.

[0057] This embodiment supplements the power supply switching logic when the flywheel speed is too low during normal shutdown, improving the overall control of normal shutdown. When the flywheel speed cannot stabilize the AC voltage, it promptly switches to the main grid or backup power supply to prevent auxiliary equipment from being damaged due to power outages, ensuring the smoothness and continuity of power supply switching, and further improving the integrity of the normal shutdown process and the safety of system operation.

[0058] S130: In the event of a main grid fault or grid-side converter fault, and the generator-side converter is normal, the energy storage flywheel supplies power to the flywheel energy storage auxiliary equipment through the braking inverter. The braking resistor brakes the flywheel motor through the braking inverter. The generator-side converter controls the DC voltage. The braking inverter operates in V / f (constant AC voltage and frequency) control mode. By adjusting the switching on and off of the braking resistor, the power consumption is changed so that the power supply is prioritized for the flywheel energy storage auxiliary equipment.

[0059] In this step, switch KM1 is closed; auxiliary power supply first power switch KM21 is opened, auxiliary power supply second power switch KM22 is opened, auxiliary power supply third power switch KM23 is closed, braking resistor first switch KM3 is closed, braking resistor second switch KM4 is opened, and machine-side converter switch KM5 is closed.

[0060] Specifically, in the event of a main grid fault or a grid-side converter failure, but with the generator-side converter functioning normally, the flywheel supplies power to auxiliary equipment via a braking inverter, and the braking resistor brakes the flywheel motor via the braking inverter. The generator-side converter controls the DC voltage, and the DC / AC converter (braking inverter) operates in V / f (constant AC voltage and frequency) control mode. The lower the flywheel speed, the lower its output active power. By adjusting the switching on and off of the braking resistor, the power consumption of the braking resistor is changed, prioritizing power supply to the load.

[0061] This embodiment clarifies the switching actions under main grid / grid-side converter fault conditions (machine side normal), achieving coordinated protection of braking and power supply in fault scenarios. By closing the first switch of the braking resistor and the third power supply switch of the auxiliary power supply, the braking inverter drives the braking resistor to brake the flywheel and supplies power to the auxiliary equipment, while V / f control ensures power quality. The design prioritizes power to meet the needs of auxiliary equipment, maximizing the protection of critical equipment operation under fault conditions and improving the system's fault adaptability.

[0062] S132, when the speed of the energy storage flywheel drops to the preset speed and the voltage of the flywheel motor drops, causing the braking inverter to be unable to output AC power stably, the braking resistor is directly connected to the flywheel motor through the second switch of the braking resistor to brake the flywheel motor; if the main grid is normal, it is powered by the main grid, and if the main grid is abnormal, it is powered by the backup power supply.

[0063] In this step, switch KM1 is closed; when the main power grid is normal, auxiliary power supply first power switch KM21 is closed; when the main power grid is abnormal, auxiliary power supply second power switch KM22 is closed, and auxiliary power supply third power switch KM23 is opened; braking resistor first switch KM3 is opened, braking resistor second switch KM4 is closed, and generator-side converter switch KM5 is opened.

[0064] This embodiment supplements the switching logic when the flywheel speed is too low under the above-mentioned fault conditions, and improves the closed-loop control of braking and power supply in fault scenarios. When the braking inverter cannot output stably, it switches to the braking mode in which the braking resistor is directly connected to the motor to ensure the safe deceleration of the flywheel; at the same time, it promptly switches the main grid or backup power supply to power the auxiliary equipment to avoid braking failure or power interruption due to the decrease in speed, thereby improving the stability and fault tolerance redundancy of the system under fault conditions.

[0065] S140, in the event of a fault in the machine-side converter, the braking resistor is directly connected to the flywheel motor through the second switch of the braking resistor to brake the flywheel motor; if the second power grid is normal, it is powered by the main power grid; if the second power grid is abnormal, it is powered by the backup power supply.

[0066] In this step, switch KM1 is closed; when the main power grid is normal, auxiliary power supply first power switch KM21 is closed; when the main power grid is abnormal, auxiliary power supply second power switch KM22 is closed, and auxiliary power supply third power switch KM23 is opened; braking resistor first switch KM3 is opened, braking resistor second switch KM4 is closed, and generator-side converter switch KM5 is opened.

[0067] This embodiment clarifies the switching logic under machine-side converter failure conditions, achieving emergency protection and power supply assurance in severe fault scenarios. By directly connecting the braking resistor to the motor, the flywheel kinetic energy is quickly dissipated, preventing equipment damage caused by braking failure due to machine-side converter failure. Simultaneously, auxiliary equipment is powered through the main grid or backup power supply, ensuring uninterrupted critical auxiliary functions and improving the system's safety protection capability and reliability under severe fault conditions.

[0068] In this embodiment, the minimum configured power of the backup power supply is the power of the flywheel main engine electromagnetic bearing, vacuum system, flywheel motor cooling system, and braking resistor fan; considering the possibility of a fault in the generator-side converter, the continuous power supply duration of the backup power supply is equal to the braking duration of the flywheel unit. The backup power supply can be a second power grid, an energy storage system, a diesel generator, or other forms of power supply system.

[0069] This application presents a flywheel energy storage system and its control method that integrates kinetic energy defense and auxiliary power supply. By constructing an integrated flywheel energy storage system hardware architecture that combines kinetic energy defense and auxiliary power supply, and with the precise configuration of multiple power switches and braking switches, combined with full-condition collaborative control logic covering normal operation, shutdown, and different fault scenarios of the main grid / converter, it not only realizes the recovery and utilization of kinetic energy during flywheel braking, converting the deceleration kinetic energy into electrical energy for auxiliary equipment, reducing energy waste, but also reduces configuration costs through the precise matching design of backup power supply power and duration. At the same time, through the uninterruptible power supply guarantee of uninterruptible equipment and the smooth switching between braking mode and power supply mode under different operating conditions, it effectively improves the system's fault tolerance, operational stability, and safety protection level under complex operating conditions, achieving the dual goals of safe flywheel braking and continuous and reliable power supply to auxiliary equipment.

[0070] The acquisition, storage, use, and processing of data in this application comply with relevant laws and regulations.

[0071] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, apparatus, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0072] This invention is described with reference to flowchart illustrations and / or block diagrams of methods and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0073] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0074] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0075] Finally, it should be noted that the above-described embodiments are merely specific implementations of the present invention, used to illustrate the technical solutions of the present invention, and not to limit it. The scope of protection of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments within the technical scope disclosed in the present invention, or make equivalent substitutions for some of the technical features; and these modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A flywheel energy storage system integrating kinetic energy defense and auxiliary power supply, characterized in that, The system includes: a grid-side converter, a machine-side converter, a braking inverter, a first auxiliary power supply switch, a second auxiliary power supply switch, a third auxiliary power supply switch, a first braking resistor switch, a second braking resistor switch, a machine-side converter switch, a flywheel motor, and an energy storage flywheel; among which, The grid-side converter, the machine-side converter, the machine-side converter switch, the flywheel motor, and the energy storage flywheel are connected in series in sequence. The braking inverter is connected to the DC side of the machine-side converter; The first switch of the braking resistor is used to connect the braking resistor and the braking inverter, and the second switch of the braking resistor is used to connect the flywheel motor and the braking resistor. The first auxiliary power supply switch is used to connect the main power grid and the auxiliary power supply circuit; the second auxiliary power supply switch is used to connect the backup power supply and the auxiliary power supply circuit; and the third auxiliary power supply switch is used to connect the braking inverter and the auxiliary power supply circuit. The flywheel energy storage auxiliary equipment is connected to the auxiliary power supply circuit, and the flywheel energy storage auxiliary equipment is powered by adjusting the working state of the flywheel energy storage system under different operating conditions.

2. The flywheel energy storage system integrating kinetic energy defense and auxiliary power supply according to claim 1, characterized in that, The flywheel energy storage auxiliary equipment includes uninterruptible power supply equipment and equipment that can withstand brief interruptions but requires continuous power supply; The uninterruptible power supply equipment is equipped with a UPS power supply for uninterrupted power supply; the equipment that requires continuous power supply even with brief interruptions includes a converter cooling system and a flywheel cooling system.

3. The flywheel energy storage system integrating kinetic energy defense and auxiliary power supply according to claim 1, characterized in that, The minimum configured power of the backup power supply is equal to the sum of the power of the flywheel main electromagnetic bearing, vacuum system, flywheel motor cooling system and braking resistor fan; the continuous power supply duration of the backup power supply is not less than the braking duration of the flywheel unit; the backup power supply is a second power grid, energy storage system or diesel generator.

4. A flywheel energy storage control method integrating kinetic energy defense and auxiliary power supply, characterized in that, The control method is implemented based on the flywheel energy storage system integrating kinetic energy defense and auxiliary power supply as described in any one of claims 1 to 3; wherein, the method includes: During normal operation of the flywheel energy storage system, the grid-side converter controls the power, the machine-side converter controls the DC voltage, the flywheel energy storage auxiliary equipment is powered by the main grid, and the main grid and the energy storage flywheel interact with each other. When a shutdown order is received, and the main power grid, grid-side converter, and generator-side converter are all normal, the energy storage flywheel releases electricity to the main power grid and slows down, while simultaneously supplying power to the flywheel energy storage auxiliary equipment through the braking inverter. When the main grid or grid-side converter fails, and the generator-side converter is normal, the energy storage flywheel supplies power to the flywheel energy storage auxiliary equipment through the braking inverter. The braking resistor brakes the flywheel motor through the braking inverter. The generator-side converter controls the DC voltage. The braking inverter operates in V / f control mode. By adjusting the switching on and off of the braking resistor, the power consumption is changed so that the power supply is prioritized to meet the power supply needs of the flywheel energy storage auxiliary equipment. In the event of a fault in the machine-side converter, the braking resistor is directly connected to the flywheel motor via the second braking resistor switch to brake the flywheel motor; if the second power grid is normal, the main power grid supplies power; if the second power grid is abnormal, the backup power supply supplies power.

5. The flywheel energy storage control method integrating kinetic energy defense and auxiliary power supply according to claim 4, characterized in that, During normal operation of the flywheel energy storage system, the grid-side converter controls the power, the generator-side converter controls the DC voltage, and the flywheel energy storage auxiliary equipment is powered by the main grid. Energy interaction occurs between the main grid and the energy storage flywheel, including: The auxiliary power supply first power switch is closed, the auxiliary power supply second power switch is open, the auxiliary power supply third power switch is open, the braking resistor first switch is open, the braking resistor second switch is open, and the machine-side converter switch is closed.

6. The flywheel energy storage control method integrating kinetic energy defense and auxiliary power supply according to claim 4, characterized in that, Upon receiving a shutdown command, and with the main grid, grid-side converter, and generator-side converter all functioning normally, the energy storage flywheel releases electricity to the main grid and slows down. Simultaneously, it supplies power to the flywheel's auxiliary energy storage equipment via a braking inverter, including: The auxiliary power supply first power switch is open, the auxiliary power supply second power switch is open, the auxiliary power supply third power switch is closed, the braking resistor first switch is open, the braking resistor second switch is open, and the machine-side converter switch is closed.

7. The flywheel energy storage control method integrating kinetic energy defense and auxiliary power supply according to claim 4, characterized in that, Upon receiving a shutdown command, and with the main power grid, grid-side converter, and generator-side converter all functioning normally, the energy storage flywheel releases electricity to the main power grid and slows down. Simultaneously, it supplies power to the flywheel's energy storage auxiliary equipment via a braking inverter. This also includes: When the speed of the energy storage flywheel drops to a point where the AC voltage cannot be stabilized, the power supply to the flywheel energy storage auxiliary equipment through the braking inverter is stopped; if the main grid is normal, the main grid will supply power; if the main grid is abnormal, the backup power supply will supply power. When the main power grid is normal, the first auxiliary power supply switch is closed; when the main power grid is abnormal, the second auxiliary power supply switch is closed and the third auxiliary power supply switch is open; the first braking resistor switch is open and the second braking resistor switch is open, and the machine-side converter switch is closed.

8. The flywheel energy storage control method integrating kinetic energy defense and auxiliary power supply according to claim 4, characterized in that, In the event of a main grid fault or a grid-side converter fault, while the generator-side converter is functioning normally, the energy storage flywheel supplies power to the flywheel energy storage auxiliary equipment via a braking inverter. The braking resistor brakes the flywheel motor via the braking inverter. The generator-side converter controls the DC voltage, and the braking inverter operates in V / f control mode. By adjusting the switching on and off of the braking resistor, the power consumption is changed to prioritize power supply to the flywheel energy storage auxiliary equipment, including: The auxiliary power supply first power switch is open, the auxiliary power supply second power switch is open, the auxiliary power supply third power switch is closed, the braking resistor first switch is closed, the braking resistor second switch is open, and the machine-side converter switch is closed.

9. The flywheel energy storage control method integrating kinetic energy defense and auxiliary power supply according to claim 4, characterized in that, In the event of a main grid fault or a grid-side converter fault, while the generator-side converter is functioning normally, the energy storage flywheel supplies power to the flywheel energy storage auxiliary equipment via a braking inverter. The braking resistor brakes the flywheel motor via the braking inverter. The generator-side converter controls the DC voltage, and the braking inverter operates in V / f control mode. By adjusting the switching on and off of the braking resistor, the power consumption is changed to prioritize power supply to the flywheel energy storage auxiliary equipment, including: When the speed of the energy storage flywheel drops to the preset speed and the voltage of the flywheel motor drops, causing the braking inverter to be unable to output AC power stably, the braking resistor is directly connected to the flywheel motor through the second switch of the braking resistor to brake the flywheel motor; if the main grid is normal, it is powered by the main grid; if the main grid is abnormal, it is powered by the backup power supply. When the main power grid is normal, the first auxiliary power supply switch is closed; when the main power grid is abnormal, the second auxiliary power supply switch is closed and the third auxiliary power supply switch is open; the first braking resistor switch is open, the second braking resistor switch is closed, and the generator-side converter switch is open.

10. The flywheel energy storage control method integrating kinetic energy defense and auxiliary power supply according to claim 4, characterized in that, In the event of a fault in the machine-side converter, the braking resistor is directly connected to the flywheel motor through the second switch of the braking resistor to brake the flywheel motor; If the second power grid is functioning normally, power will be supplied by the main power grid. If the second power grid fails, power will be supplied by the backup power source, including: When the main power grid is normal, the first auxiliary power supply switch is closed; when the main power grid is abnormal, the second auxiliary power supply switch is closed and the third auxiliary power supply switch is open; the first braking resistor switch is open, the second braking resistor switch is closed, and the generator-side converter switch is open.

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