Flywheel energy storage power grid frequency modulation method and system with energy balance and life protection

Abstract

The invention discloses a flywheel energy storage power grid frequency modulation method and system with energy balance and life protection, and the method comprises the steps: obtaining the equivalent rotational inertia and natural damping coefficient of a power grid node, and the output power and disturbance power of a flywheel, and building a frequency dynamic model of the frequency deviation of the power grid node along with the dynamic evolution of time, the frequency deviation change rate of the power grid node dynamically evolved along with time is generated; according to the frequency deviation change rate, the frequency change rate gain and the damping response gain of the flywheel, a flywheel power control model is constructed, adjusting power which should be provided by the flywheel is calculated, and whether power output of the flywheel is automatically blocked or not is judged by combining the upper limit and the lower limit of an energy storage value of the flywheel, so that the running safety of the flywheel is ensured; and constructing a flywheel life accumulation model, calculating a fatigue accumulation value of the flywheel according to the adjusting power which should be provided by the flywheel, setting a maximum allowable life threshold value, and automatically blocking power output of the flywheel when the fatigue accumulation value exceeds the maximum allowable life threshold value.

Description

Technical Field

[0001] This invention belongs to the field of flywheel energy storage grid frequency regulation technology, and more specifically, relates to a flywheel energy storage grid frequency regulation method and system with energy balance and lifespan protection. Background Technology

[0002] Existing power grid frequency regulation technologies and flywheel energy storage control methods mainly focus on linearized power system dynamics models and simplified energy storage power output strategies. Their core idea is to approximate the power grid frequency dynamics as a second- or first-order differential equation, assuming that the flywheel's power response maintains a linear relationship with the frequency deviation or rate of change, i.e., achieving rapid following through proportional-derivative (PD) or proportional-integral-derivative (PID) controllers. However, these existing technologies have many limitations in engineering applications: First, power grid frequency fluctuations exhibit significant nonlinearity and multi-node coupling characteristics. Especially against the backdrop of large-scale integration of new energy sources and the increasing penetration of distributed power sources, the frequency response is no longer solely determined by the inertia of centralized large units, but rather manifests as complex regional frequency interactions. The single-node linear models used in existing technologies cannot accurately capture the frequency coupling effects between multiple regions, easily leading to significant deviations between the frequency regulation effect and simulation results. Secondly, as a high-speed rotating machine, flywheel energy storage involves non-linear relationships in its energy conversion, thermal effects, and lifespan evolution. For example, in actual operation, the flywheel experiences significant temperature rise during frequent high-power charging and discharging, leading to accelerated energy loss. Simultaneously, excessively high rotational speeds and frequent power fluctuations accelerate mechanical fatigue and material aging. Traditional models often use only a simple energy conservation equation to describe energy changes, neglecting temperature dependence and nonlinear loss mechanisms, thus underestimating energy decay and lifespan loss. Thirdly, regarding power output constraints, existing technologies mostly employ hard limiting to handle the flywheel's maximum power and energy limits. While this simplifies calculations, it introduces discontinuous control actions in actual operation, potentially causing abrupt changes between power commands and actual output, reducing system stability, and even triggering secondary disturbances to the power grid.

[0003] Therefore, a technical solution is urgently needed to improve the authenticity, reliability, and engineering value of overall frequency modulation. Summary of the Invention

[0004] To address the above technical problems, this invention proposes a flywheel energy storage grid frequency regulation method with energy balance and lifespan protection, comprising: Step 101: Obtain the equivalent moment of inertia, natural damping coefficient, flywheel output power and disturbance power of the grid node, establish a frequency dynamic model of the dynamic evolution of the frequency deviation of the grid node over time, and thus generate the frequency deviation change rate of the grid node over time. Step 102: Based on the frequency deviation change rate, the frequency change rate gain and damping response gain of the flywheel, construct a flywheel power control model, calculate the regulation power that the flywheel should provide, and combine the upper and lower limits of the flywheel's energy storage value to determine whether to automatically block the flywheel's power output to ensure the safety of the flywheel's operation. Step 103: Construct a flywheel life accumulation model. Calculate the cumulative fatigue value of the flywheel based on the regulation power that the flywheel should provide, and set a maximum allowable life threshold. When the cumulative fatigue value exceeds the maximum allowable life threshold, automatically block the flywheel's power output to avoid failure due to overuse.

[0005] Furthermore, the frequency dynamics model includes: , in, For time Time Frequency deviation of individual power grid nodes For the first Damping coefficient of each power grid node, For the first The equivalent rotational inertia of each power grid node For the number of flywheels, For time Time The first power grid node The output power of each flywheel For the first The maximum output power of each flywheel For time Time The disturbance power of each grid node.

[0006] Furthermore, the flywheel power control model includes: , in, For time Time The regulating power that each flywheel should provide. For the first The frequency change rate gain of each flywheel For the first Damping response gain of each flywheel For time Time The energy storage value corresponding to each flywheel For the first The minimum energy storage value corresponding to each flywheel For the first The maximum energy storage value corresponding to each flywheel.

[0007] Furthermore, by using a flywheel energy evolution model, time can be obtained. Time The energy storage value corresponding to each flywheel include: , in, For the first Energy attenuation coefficient of each flywheel For the first The gain factor of energy loss due to the increase in flywheel temperature. For the first The energy secondary constraint coefficient of each flywheel For time Time The temperature of the flywheel.

[0008] Furthermore, the flywheel life accumulation model includes: , in, For time Time The cumulative fatigue value of each flywheel. For time Time The initial cumulative fatigue value of each flywheel. For time Time The regulating power that each flywheel should provide. For the first The rated power of each flywheel, Power index, For the first The rate of change of the output power of a flywheel affects the fatigue gain coefficient.

[0009] Furthermore, step 103 also includes: using time Time The regulating power that each flywheel should provide Update the time in the frequency dynamics model and the flywheel energy evolution model. Time The first power grid node The output power of each flywheel Repeat steps 101-103.

[0010] Furthermore, step 101 also includes: initializing the output power of the flywheel in step 101.

[0011] This invention also proposes a flywheel energy storage grid frequency regulation system with energy balance and lifespan protection, comprising: The dynamic evolution module is used to obtain the equivalent rotational inertia, natural damping coefficient, flywheel output power and disturbance power of the grid nodes, establish a frequency dynamic model of the frequency deviation of the grid nodes over time, and thus generate the frequency deviation change rate of the grid nodes over time. The power control module is used to construct a flywheel power control model based on the frequency deviation change rate, the flywheel frequency change rate gain, and the damping response gain, calculate the regulation power that the flywheel should provide, and determine whether to automatically block the flywheel's power output based on the upper and lower limits of the flywheel's energy storage value, so as to ensure the safety of the flywheel's operation. The flywheel fatigue evaluation module is used to build a flywheel life accumulation model. Based on the regulation power that the flywheel should provide, it calculates the cumulative fatigue value of the flywheel and sets the maximum allowable life threshold. When the cumulative fatigue value exceeds the maximum allowable life threshold, it automatically blocks the flywheel's power output to avoid failure caused by overuse.

[0012] Furthermore, the frequency dynamics model includes: , in, For time Time Frequency deviation of individual power grid nodes For the first Damping coefficient of each power grid node, For the first The equivalent rotational inertia of each power grid node For the number of flywheels, For time Time The first power grid node The output power of each flywheel For the first The maximum output power of each flywheel For time Time The disturbance power of each grid node.

[0013] Furthermore, the flywheel power control model includes: , in, For time Time The regulating power that each flywheel should provide. For the first The frequency change rate gain of each flywheel For the first Damping response gain of each flywheel For time Time The energy storage value corresponding to each flywheel For the first The minimum energy storage value corresponding to each flywheel For the first The maximum energy storage value corresponding to each flywheel.

[0014] In summary, the technical solutions conceived by this invention have the following beneficial effects compared with the prior art: The technical solution of this invention, while maintaining the measurability and controllability of physical quantities, realizes the comprehensive modeling of the nonlinearity, coupling and lifetime effects of flywheel energy storage in the grid frequency regulation process, thereby significantly improving the authenticity, stability and engineering application value of frequency control. Attached Figure Description

[0015] Figure 1 This is a flowchart of the method in Embodiment 1 of the present invention; Figure 2 This is a system structure diagram of Embodiment 2 of the present invention. Detailed Implementation

[0016] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0017] The method provided by this invention can be implemented in a terminal environment that may include one or more of the following components: a processor, a storage medium, and a display screen. The storage medium stores at least one instruction, which is loaded and executed by the processor to implement the method described in the following embodiments.

[0018] A processor may include one or more processing cores. The processor uses various interfaces and lines to connect various parts of the terminal, and performs various functions and processes data by running or executing instructions, programs, code sets or instruction sets stored in the storage medium, and by calling data stored in the storage medium.

[0019] Storage media can include random access memory (RAM) or read-only memory (ROM). Storage media can be used to store instructions, programs, code, code sets, or instructions.

[0020] The display screen is used to show the user interface of each application.

[0021] In addition, those skilled in the art will understand that the structure of the terminal described above does not constitute a limitation on the terminal. The terminal may include more or fewer components, or combine certain components, or have different component arrangements. For example, the terminal may also include radio frequency circuits, input units, sensors, audio circuits, power supplies, and other components, which will not be described in detail here.

[0022] Example 1 like Figure 1 As shown in the figure, this embodiment proposes a flywheel energy storage grid frequency regulation method with energy balance and lifespan protection, including: Step 101: Obtain the equivalent moment of inertia, natural damping coefficient, flywheel output power and disturbance power of the grid node, establish a frequency dynamic model of the dynamic evolution of the frequency deviation of the grid node over time, and thus generate the frequency deviation change rate of the grid node over time. Preferably, a grid node refers to a voltage balance point in a power system, which may include generators (such as synchronous machines and flywheel energy storage), loads (electrical equipment), and power conversion equipment (such as transformers and transmission line connection points).

[0023] Specifically, step 101 also includes: initializing the output power of the flywheel in step 101.

[0024] Specifically, the frequency dynamics model includes: , in, For time Time Frequency deviation of individual power grid nodes For the first Damping coefficient of each grid node (representing the additional power consumption caused by frequency deviation) The larger the value, the less the frequency drops, and the more stable the system. For the first The equivalent rotational inertia of each power grid node For the number of flywheels, For time Time The first power grid node The output power of each flywheel For the first The maximum output power of each flywheel For time Time The disturbance power of each grid node (the power output of wind farms and photovoltaic power plants fluctuates rapidly with wind speed and sunlight, resulting in random disturbances in the power injected into the grid).

[0025] Step 102: Based on the frequency deviation change rate, the frequency change rate gain and damping response gain of the flywheel, construct a flywheel power control model, calculate the regulation power that the flywheel should provide, and combine the upper and lower limits of the flywheel's energy storage value to determine whether to automatically block the flywheel's power output to ensure the safety of the flywheel's operation. Specifically, the flywheel power control model includes: , in, For time Time The regulating power that each flywheel should provide. For the first The frequency change rate gain of each flywheel For the first Damping response gain of each flywheel For time Time The energy storage value corresponding to each flywheel For the first The minimum energy storage value corresponding to each flywheel For the first The maximum energy storage value corresponding to each flywheel.

[0026] Preferably, in this embodiment, the first [item] is obtained in the following manner. The frequency change rate gain of each flywheel and the Damping response gain of each flywheel : Regarding the first The frequency change rate gain of each flywheel Based on maximum output power calculate: , in, The duration of a typical disturbance (such as a sudden surge in load or rapid fluctuations in wind and solar power).

[0027] Regarding the first Damping response gain of each flywheel Based on maximum output power Maximum allowable frequency deviation : , Specifically, time is obtained through the flywheel energy evolution model. Time The energy storage value corresponding to each flywheel include: , in, For the first Energy attenuation coefficient of each flywheel For the first The gain factor of energy loss due to the increase in flywheel temperature. For the first The energy secondary constraint coefficient of each flywheel (based on engineering experience) The range can be 0.1–1 (to balance safety and control performance). For time Time The temperature of the flywheel.

[0028] Preferably, in this embodiment, the first [item] is obtained in the following manner. Energy attenuation coefficient of each flywheel , No. The gain factor of the increase in flywheel temperature on energy loss , No. The energy secondary constraint coefficient of each flywheel : Regarding the first Energy attenuation coefficient of each flywheel Under different power and temperature conditions, the energy decay of the flywheel over time was measured, and then the following formula was used to obtain... : , Regarding the first The gain factor of the increase in flywheel temperature on energy loss At different output power The change in flywheel temperature over time and the additional energy loss caused by the temperature rise effect were measured. And solve it using the following formula : , in, This refers to the time interval corresponding to the energy loss observation.

[0029] Step 103: Construct a flywheel life accumulation model. Calculate the cumulative fatigue value of the flywheel based on the regulation power that the flywheel should provide, and set a maximum allowable life threshold. When the cumulative fatigue value exceeds the maximum allowable life threshold, automatically block the flywheel's power output to avoid failure due to overuse.

[0030] Specifically, the flywheel life accumulation model includes: , in, For time Time The cumulative fatigue value of each flywheel. For time Time The initial cumulative fatigue value of each flywheel. For time Time The regulating power that each flywheel should provide. For the first The rated power of each flywheel, Power index (for high-speed flywheels) A value of 1.2–2 can be used for low-speed, low-power flywheels. (You can take 1–1.5). For the first The rate of change of the output power of each flywheel has a fatigue gain coefficient (based on the flywheel's mechanical and motor characteristics). The value is generally taken in the range of 0.001–0.01 s / W.

[0031] Specifically, step 103 also includes: using time Time The regulating power that each flywheel should provide Update the time in the frequency dynamics model and the flywheel energy evolution model. Time The first power grid node The output power of each flywheel Repeat steps 101-103.

[0032] Example 2 like Figure 2 As shown, this embodiment proposes a flywheel energy storage grid frequency regulation system with energy balance and lifespan protection, including: The dynamic evolution module is used to obtain the equivalent rotational inertia, natural damping coefficient, flywheel output power and disturbance power of the grid nodes, establish a frequency dynamic model of the frequency deviation of the grid nodes over time, and thus generate the frequency deviation change rate of the grid nodes over time. Specifically, the dynamic evolution module also includes: initializing the output power of the flywheel in the dynamic evolution module.

[0033] Specifically, the frequency dynamics model includes: , in, For time Time Frequency deviation of individual power grid nodes For the first Damping coefficient of each power grid node, For the first The equivalent rotational inertia of each power grid node For the number of flywheels, For time Time The first power grid node The output power of each flywheel For the first The maximum output power of each flywheel For time Time The disturbance power of each grid node.

[0034] The power control module is used to construct a flywheel power control model based on the frequency deviation change rate, the flywheel frequency change rate gain, and the damping response gain, calculate the regulation power that the flywheel should provide, and determine whether to automatically block the flywheel's power output based on the upper and lower limits of the flywheel's energy storage value, so as to ensure the safety of the flywheel's operation. Specifically, the flywheel power control model includes: , in, For time Time The regulating power that each flywheel should provide. For the first The frequency change rate gain of each flywheel For the first Damping response gain of each flywheel For time Time The energy storage value corresponding to each flywheel For the first The minimum energy storage value corresponding to each flywheel For the first The maximum energy storage value corresponding to each flywheel.

[0035] Specifically, time is obtained through the flywheel energy evolution model. Time The energy storage value corresponding to each flywheel include: , in, For the first Energy attenuation coefficient of each flywheel For the first The gain factor of energy loss due to the increase in flywheel temperature. For the first The energy secondary constraint coefficient of each flywheel For time Time The temperature of the flywheel.

[0036] The flywheel fatigue evaluation module is used to build a flywheel life accumulation model. Based on the regulation power that the flywheel should provide, it calculates the cumulative fatigue value of the flywheel and sets the maximum allowable life threshold. When the cumulative fatigue value exceeds the maximum allowable life threshold, it automatically blocks the flywheel's power output to avoid failure caused by overuse.

[0037] Specifically, the flywheel life accumulation model includes: , in, For time Time The cumulative fatigue value of each flywheel. For time Time The initial cumulative fatigue value of each flywheel. For time Time The regulating power that each flywheel should provide. For the first The rated power of each flywheel, Power index, For the first The rate of change of the output power of a flywheel affects the fatigue gain coefficient.

[0038] Specifically, the flywheel fatigue evaluation module also includes: using time Time The regulating power that each flywheel should provide Update the time in the frequency dynamics model and the flywheel energy evolution model. Time The first power grid node The output power of each flywheel Re-execute the dynamic evolution module - flywheel fatigue evaluation module.

[0039] Example 3 This invention also proposes a storage medium storing multiple instructions, which are used to implement the flywheel energy storage grid frequency regulation method with energy balance and lifespan protection.

[0040] Optionally, in this embodiment, the storage medium may be located in any computer terminal in a group of computer terminals in a computer network, or in any mobile terminal in a group of mobile terminals.

[0041] Optionally, in this embodiment, the storage medium is configured to store program code for performing the following method steps: Step 101, obtain the equivalent moment of inertia, natural damping coefficient, flywheel output power and disturbance power of the grid node, establish a frequency dynamic model of the frequency deviation of the grid node evolving over time, thereby generating the frequency deviation change rate of the grid node evolving over time. Specifically, step 101 also includes: initializing the output power of the flywheel in step 101.

[0042] Specifically, the frequency dynamics model includes: , in, For time Time Frequency deviation of individual power grid nodes For the first Damping coefficient of each power grid node, For the first The equivalent rotational inertia of each power grid node For the number of flywheels, For time Time The first power grid node The output power of each flywheel For the first The maximum output power of each flywheel For time Time The disturbance power of each grid node.

[0043] Step 102: Based on the frequency deviation change rate, the frequency change rate gain and damping response gain of the flywheel, construct a flywheel power control model, calculate the regulation power that the flywheel should provide, and combine the upper and lower limits of the flywheel's energy storage value to determine whether to automatically block the flywheel's power output to ensure the safety of the flywheel's operation. Specifically, the flywheel power control model includes: , in, For time Time The regulating power that each flywheel should provide. For the first The frequency change rate gain of each flywheel For the first Damping response gain of each flywheel For time Time The energy storage value corresponding to each flywheel For the first The minimum energy storage value corresponding to each flywheel For the first The maximum energy storage value corresponding to each flywheel.

[0044] Specifically, time is obtained through the flywheel energy evolution model. Time The energy storage value corresponding to each flywheel include: , in, For the first Energy attenuation coefficient of each flywheel For the first The gain factor of energy loss due to the increase in flywheel temperature. For the first The energy secondary constraint coefficient of each flywheel For time Time The temperature of the flywheel.

[0045] Step 103: Construct a flywheel life accumulation model. Calculate the cumulative fatigue value of the flywheel based on the regulation power that the flywheel should provide, and set a maximum allowable life threshold. When the cumulative fatigue value exceeds the maximum allowable life threshold, automatically block the flywheel's power output to avoid failure due to overuse.

[0046] Specifically, the flywheel life accumulation model includes: , in, For time Time The cumulative fatigue value of each flywheel. For time Time The initial cumulative fatigue value of each flywheel. For time Time The regulating power that each flywheel should provide. For the first The rated power of each flywheel, Power index, For the first The rate of change of the output power of a flywheel affects the fatigue gain coefficient.

[0047] Specifically, step 103 also includes: using time Time The regulating power that each flywheel should provide Update the time in the frequency dynamics model and the flywheel energy evolution model. Time The first power grid node The output power of each flywheel Repeat steps 101-103.

[0048] Example 4 This invention also proposes an electronic device, including a processor and a storage medium connected to the processor. The storage medium stores multiple instructions, which can be loaded and executed by the processor to enable the processor to execute the flywheel energy storage grid frequency regulation method with energy balance and lifespan protection.

[0049] Specifically, the electronic device in this embodiment can be a computer terminal, which may include one or more processors and a storage medium.

[0050] The storage medium can be used to store software programs and modules, such as the flywheel energy storage grid frequency regulation method with energy balance and lifespan protection in this embodiment of the invention. The corresponding program instructions / modules are executed by the processor through running the software programs and modules stored in the storage medium, thereby performing various functional applications and data processing, thus realizing the aforementioned flywheel energy storage grid frequency regulation method with energy balance and lifespan protection. The storage medium may include high-speed random access storage media, and may also include non-volatile storage media, such as one or more magnetic storage systems, flash memory, or other non-volatile solid-state storage media. In some instances, the storage medium may further include storage media remotely configured relative to the processor, which can be connected to the terminal via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0051] The processor can call the information and application stored in the storage medium through the transmission system to execute the following method steps: Step 101, obtain the equivalent moment of inertia, natural damping coefficient, flywheel output power and disturbance power of the grid node, establish a frequency dynamic model of the frequency deviation of the grid node evolving over time, and thus generate the frequency deviation change rate of the grid node evolving over time. Specifically, step 101 also includes: initializing the output power of the flywheel in step 101.

[0052] Specifically, the frequency dynamics model includes: , in, For time Time Frequency deviation of individual power grid nodes For the first Damping coefficient of each power grid node, For the first The equivalent rotational inertia of each power grid node For the number of flywheels, For time Time The first power grid node The output power of each flywheel For the first The maximum output power of each flywheel For time Time The disturbance power of each grid node.

[0053] Step 102: Based on the frequency deviation change rate, the frequency change rate gain and damping response gain of the flywheel, construct a flywheel power control model, calculate the regulation power that the flywheel should provide, and combine the upper and lower limits of the flywheel's energy storage value to determine whether to automatically block the flywheel's power output to ensure the safety of the flywheel's operation. Specifically, the flywheel power control model includes: , in, For time Time The regulating power that each flywheel should provide. For the first The frequency change rate gain of each flywheel For the first Damping response gain of each flywheel For time Time The energy storage value corresponding to each flywheel For the first The minimum energy storage value corresponding to each flywheel For the first The maximum energy storage value corresponding to each flywheel.

[0054] Specifically, time is obtained through the flywheel energy evolution model. Time The energy storage value corresponding to each flywheel include: , in, For the first Energy attenuation coefficient of each flywheel For the first The gain factor of energy loss due to the increase in flywheel temperature. For the first The energy secondary constraint coefficient of each flywheel For time Time The temperature of the flywheel.

[0055] Step 103: Construct a flywheel life accumulation model. Calculate the cumulative fatigue value of the flywheel based on the regulation power that the flywheel should provide, and set a maximum allowable life threshold. When the cumulative fatigue value exceeds the maximum allowable life threshold, automatically block the flywheel's power output to avoid failure due to overuse.

[0056] Specifically, the flywheel life accumulation model includes: , in, For time Time The cumulative fatigue value of each flywheel. For time Time The initial cumulative fatigue value of each flywheel. For time Time The regulating power that each flywheel should provide. For the first The rated power of each flywheel, Power index, For the first The rate of change of the output power of a flywheel affects the fatigue gain coefficient.

[0057] Specifically, step 103 also includes: using time Time The regulating power that each flywheel should provide Update the time in the frequency dynamics model and the flywheel energy evolution model. Time The first power grid node The output power of each flywheel Repeat steps 101-103.

[0058] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0059] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0060] In the several embodiments provided by this invention, it should be understood that the disclosed technical content can be implemented in other ways. The system embodiments described above are merely illustrative; for example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, indirect coupling or communication connection between units or modules, and may be electrical or other forms.

[0061] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0062] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0063] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes: USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, optical disks, and other media capable of storing program code.

[0064] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A flywheel energy storage grid frequency regulation method with energy balance and lifespan protection, characterized in that, include: Step 101: Obtain the equivalent moment of inertia, natural damping coefficient, flywheel output power and disturbance power of the grid node, establish a frequency dynamic model of the dynamic evolution of the frequency deviation of the grid node over time, and thus generate the frequency deviation change rate of the grid node over time. Step 102: Based on the frequency deviation change rate, the frequency change rate gain and damping response gain of the flywheel, construct a flywheel power control model, calculate the regulation power that the flywheel should provide, and combine the upper and lower limits of the flywheel's energy storage value to determine whether to automatically block the flywheel's power output to ensure the safety of the flywheel's operation. Step 103: Construct a flywheel life accumulation model. Calculate the cumulative fatigue value of the flywheel based on the regulation power that the flywheel should provide, and set a maximum allowable life threshold. When the cumulative fatigue value exceeds the maximum allowable life threshold, automatically block the flywheel's power output to avoid failure due to overuse.

2. The flywheel energy storage grid frequency regulation method with energy balance and lifespan protection as described in claim 1, characterized in that, The frequency dynamics model includes: ， in, For time Time Frequency deviation of individual power grid nodes For the first Damping coefficient of each power grid node, For the first The equivalent rotational inertia of each power grid node The number of flywheels, For time Time The first power grid node The output power of each flywheel For the first The maximum output power of each flywheel For time Time The disturbance power of each grid node.

3. The flywheel energy storage grid frequency regulation method with energy balance and lifespan protection as described in claim 2, characterized in that, The flywheel power control model includes: ， in, For time Time The regulating power that each flywheel should provide. For the first The frequency change rate gain of each flywheel For the first Damping response gain of each flywheel For time Time The energy storage value corresponding to each flywheel For the first The minimum energy storage value corresponding to each flywheel For the first The maximum energy storage value corresponding to each flywheel.

4. The flywheel energy storage grid frequency regulation method with energy balance and lifespan protection as described in claim 3, characterized in that, Time is obtained through the flywheel energy evolution model. Time The energy storage value corresponding to each flywheel include: ， in, For the first Energy attenuation coefficient of each flywheel For the first The gain factor of energy loss due to the increase in flywheel temperature. For the first The energy secondary constraint coefficient of each flywheel For time Time The temperature of the flywheel.

5. The flywheel energy storage grid frequency regulation method with energy balance and lifespan protection as described in claim 3, characterized in that, The flywheel life accumulation model includes: ， in, For time Time The cumulative fatigue value of each flywheel. For time Time The initial cumulative fatigue value of each flywheel. For time Time The regulating power that each flywheel should provide. For the first The rated power of each flywheel, Power index, For the first The rate of change of the output power of a flywheel affects the fatigue gain coefficient.

6. The flywheel energy storage grid frequency regulation method with energy balance and lifespan protection as described in claim 3, characterized in that, Step 103 also includes: using time Time The regulating power that each flywheel should provide Update the time in the frequency dynamics model and the flywheel energy evolution model. Time The first power grid node The output power of each flywheel Repeat steps 101-103.

7. The flywheel energy storage grid frequency regulation method with energy balance and lifespan protection as described in claim 1, characterized in that, Step 101 also includes: initializing the output power of the flywheel in step 101.

8. A flywheel energy storage grid frequency regulation system with energy balance and lifespan protection, characterized in that, include: The dynamic evolution module is used to obtain the equivalent rotational inertia, natural damping coefficient, flywheel output power and disturbance power of the grid nodes, establish a frequency dynamic model of the frequency deviation of the grid nodes over time, and thus generate the frequency deviation change rate of the grid nodes over time. The power control module is used to construct a flywheel power control model based on the frequency deviation change rate, the flywheel frequency change rate gain, and the damping response gain, calculate the regulation power that the flywheel should provide, and determine whether to automatically block the flywheel's power output based on the upper and lower limits of the flywheel's energy storage value, so as to ensure the safety of the flywheel's operation. The flywheel fatigue evaluation module is used to build a flywheel life accumulation model. Based on the regulation power that the flywheel should provide, it calculates the cumulative fatigue value of the flywheel and sets the maximum allowable life threshold. When the cumulative fatigue value exceeds the maximum allowable life threshold, it automatically blocks the flywheel's power output to avoid failure caused by overuse.

9. A flywheel energy storage grid frequency regulation system with energy balance and lifespan protection as described in claim 8, characterized in that, The frequency dynamics model includes: ， in, For time Time Frequency deviation of individual power grid nodes For the first Damping coefficient of each power grid node, For the first The equivalent rotational inertia of each power grid node The number of flywheels, For time Time The first power grid node The output power of each flywheel For the first The maximum output power of each flywheel For time Time The disturbance power of each grid node.

10. A flywheel energy storage grid frequency regulation system with energy balance and lifespan protection as described in claim 9, characterized in that, The flywheel power control model includes: ， in, For time Time The regulating power that each flywheel should provide. For the first The frequency change rate gain of each flywheel For the first Damping response gain of each flywheel For time Time The energy storage value corresponding to each flywheel For the first The minimum energy storage value corresponding to each flywheel For the first The maximum energy storage value corresponding to each flywheel.

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