A flywheel energy storage coupled primary frequency modulation cooperative control method, system, device and medium of a main frequency modulation unit

Abstract

The application discloses a flywheel energy storage coupled primary frequency modulation unit primary frequency modulation cooperative control method, system, equipment and medium, and belongs to the field of power system automatic control and energy storage technology, and comprises the following steps: in the preset time at the initial stage of the grid frequency out-of-limit, controlling the flywheel energy storage system to undertake all primary frequency modulation target power, and using rapidity to suppress frequency change; controlling the flexible ramp rate of the main frequency modulation unit to increase output and replace the flywheel, and realizing power smooth handover; if the main frequency modulation unit is insufficient due to working medium parameter limitation, the flywheel automatically compensates the power gap; after the frequency modulation action is finished, the total grid-connected power of the system is kept unchanged, the flywheel is charged and discharged by the main frequency modulation unit adjustment base point output, and the state of charge of the flywheel is restored to the best interval without disturbance. The application fully gives play to the power density advantage of the flywheel and the energy advantage of the main frequency modulation unit, effectively solves the contradiction between frequency modulation response speed and duration, and improves the grid frequency stability.

Description

Technical Field

[0001] This invention relates to the fields of power system automation control and energy storage technology, specifically to a method, system, equipment, and medium for primary frequency regulation coordinated control of a flywheel energy storage coupled main frequency regulation unit. Background Technology

[0002] Traditional frequency-regulating units, such as compressed air energy storage units or thermal power units, are limited by the mechanical and thermal inertia of their thermal or pneumatic systems, resulting in response delays, mechanical wear, and operational limitations. Due to these issues, in conventional or commonly used technologies, the unit struggles to rapidly output the required power in the initial seconds of a frequency surge, leading to a significant frequency drop. Furthermore, frequent small-amplitude oscillations exacerbate fatigue wear on valves and rotating components. When working fluid parameters fluctuate, the unit's load-carrying capacity is limited, easily causing technical defects such as adjustment deviations, resulting in severe losses in overall operation and shortening the service life of the frequency-regulating unit.

[0003] Finally, although flywheel energy storage has a millisecond-level response speed, its energy density is low. If it participates in frequency regulation independently, it is very easy to be forced to withdraw due to energy depletion, that is, exceeding the SOC limit, resulting in a secondary impact on the grid frequency.

[0004] Existing technologies lack a sophisticated design for coordinating flywheel power depletion with the main unit's ramp-up relay, and often cause grid-connected power fluctuations during the SOC recovery phase after frequency regulation. Therefore, there is an urgent need for a collaborative control method that can balance speed, durability, and self-healing capabilities. Summary of the Invention

[0005] In view of the above-mentioned problems, the present invention is proposed.

[0006] Therefore, the present invention aims to provide a control method for jointly participating in primary frequency regulation of the power grid using a flywheel energy storage system (FES) and a large generator set (such as compressed air energy storage CAES or thermal power generator set), in order to solve the technical problems of performance shortcomings and lack of accurate power allocation strategy when a single device participates in primary frequency regulation, and to solve the technical problem of not optimizing the energy storage state after the flywheel energy storage participates in frequency regulation.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit, comprising, In response to the primary frequency regulation triggering of the main frequency regulation unit, the total power demand for primary frequency regulation is calculated, and priority power allocation is performed based on the total power demand for primary frequency regulation. Based on the result of the priority power allocation, the continuous output time of the flywheel energy storage is calculated, the power transfer process is initiated, and primary frequency regulation is performed until the output power of the flywheel energy storage is zero, at which point the primary frequency regulation action is completed. After the primary frequency regulation action is completed, the current energy storage state of the flywheel energy storage is calculated, and energy storage state self-recovery control is implemented in response.

[0008] As a preferred embodiment of the primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulating unit according to the present invention, wherein: the response to the primary frequency regulation triggering of the main frequency regulating unit includes: The power grid frequency signal is acquired in real time at the first target frequency, and the frequency deviation is calculated based on the rated frequency of the power grid. In response to a frequency deviation exceeding the frequency dead zone, a frequency modulation action is triggered to perform priority power allocation.

[0009] As a preferred embodiment of the primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit described in this invention, wherein: the priority power allocation includes: Read the current status parameters of the flywheel energy storage system, including the flywheel's maximum rated power and the current maximum allowable output power; The priority allocation logic is executed, with the flywheel energy storage providing the frequency regulation power first. The corresponding output power is calculated. In response to the output power being less than the total power required for primary frequency regulation, the turbine generator set makes up the difference between the output power and the total power required for primary frequency regulation. After making up the difference, the minimum value between the total power required for primary frequency regulation and the current state parameters is retrieved to generate a flywheel target command. At the same time, the flywheel target command is sent to the turbine generator set. After receiving the flywheel target command, power is injected into or absorbed from the power grid.

[0010] As a preferred embodiment of the primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit described in this invention, the priority power allocation further includes: After receiving the flywheel target command and injecting or absorbing power into the grid, the flywheel output is insufficient in response to the calculation results showing that the flywheel target command is less than the total power required for primary frequency regulation. The difference between the flywheel target command and the total power required for primary frequency regulation is sent as a supplementary command to the turbine generator set, instructing the main frequency regulation unit to provide supplementary power.

[0011] As a preferred embodiment of the primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit described in this invention, the starting power transfer process includes: Based on the results of priority power allocation, the high power output duration of the flywheel is continuously monitored and the continuous output time of flywheel energy storage is calculated by minimizing the preset duration, the current remaining energy of flywheel energy storage, and the rated maximum energy of flywheel energy storage. When the high-power output duration reaches the flywheel energy storage continuous output time, the power transfer logic is triggered. Based on the physical characteristics of the turbine generator set, a safe power change rate is calculated and power is transferred. The power change rate is represented by the power transfer rate. During the power transfer process, the flywheel energy storage output power decreases over time, while the turbine generator set output power increases over time until the flywheel target command is zero. At this point, all frequency regulation power is provided by the turbine generator set. If the actual output power of the turbine generator set is insufficient, the flywheel energy storage will make up the power.

[0012] The preferred technical solution in the embodiments of the present invention has the following advantages: by smoothly transferring the frequency regulation power to the turbine generator set, over-discharge of flywheel energy storage is avoided, and the frequency regulation process is ensured to be stable and continuous.

[0013] As a preferred embodiment of the primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit according to the present invention, wherein: the response to the energy storage state self-recovery control includes: When the grid frequency returns to the dead zone range, the frequency regulation operation ends. The current state of charge of the flywheel is read by the percentage of the ratio of the current remaining energy of the flywheel energy storage to the rated maximum energy of the flywheel energy storage. It also determines whether the current state of charge of the flywheel is in the optimal range. If the current state of charge of the flywheel is not in the preset optimal range, it controls the turbine generator set to charge or discharge in conjunction with the flywheel energy storage, and keeps the total output power of the system unchanged during the adjustment process. When the current state of charge of the flywheel is less than the minimum value of the optimal range, the turbine generator set is controlled to output additional charging power, and the flywheel energy storage is charged by minimizing the standby power of the turbine generator set and the maximum charging power of the flywheel energy storage. When the current state of charge of the flywheel is greater than the maximum value of the optimal range, the flywheel energy storage releases discharge power by selecting the minimum value among the difference between the current remaining energy of the flywheel energy storage and the rated maximum energy and the maximum discharge power of the flywheel energy storage, so that the turbine generator set reduces the corresponding power output.

[0014] The preferred technical solution in the embodiments of the present invention has the following beneficial effects: automatically adjusting the flywheel energy storage state of charge to the optimal range, maintaining its responsiveness and extending its service life.

[0015] As a preferred embodiment of the primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit described in this invention, the method further includes: performing abnormal operating condition adaptation after completing the self-recovery of the energy storage state. When the flywheel energy storage fails and cannot output power, the turbine generator set directly undertakes all the total power required for primary frequency regulation; When any turbine generator unit fails, the remaining frequency regulation power is jointly provided by the remaining normal turbine generator units and flywheel energy storage.

[0016] The beneficial effects of the preferred technical solution in the embodiments of the present invention are: to activate the backup frequency modulation scheme when the equipment fails, thereby ensuring the reliability of the primary frequency modulation service and the robustness of the system.

[0017] Another objective of this invention is to provide a primary frequency regulation coordinated control system for a flywheel energy storage coupled main frequency regulation unit.

[0018] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a primary frequency regulation coordinated control system for a flywheel energy storage coupled main frequency regulation unit, comprising: a power grid frequency monitoring module, a flywheel energy storage system, a turbine generator set, and a central control unit; The power grid frequency monitoring module, in response to the primary frequency regulation triggering of the main frequency regulation unit, calculates the total power demand for primary frequency regulation and performs priority power allocation based on the total power demand for primary frequency regulation. The flywheel energy storage system calculates the continuous output time of the flywheel energy storage based on the priority power allocation result, initiates the power transfer process, performs one frequency regulation until the flywheel energy storage output power is zero, and the one frequency regulation action is completed; after the one frequency regulation action is completed, the current energy storage state of the flywheel energy storage is calculated, and the energy storage state self-recovery control is responded to. The turbine generator set includes, but is not limited to, compressed air energy storage units and thermal power generator sets; The central control unit executes the control processes of the power grid frequency monitoring module, flywheel energy storage system, and turbine generator set.

[0019] The present invention provides a computer device, including a memory and a processor, wherein the memory stores a computer program, characterized in that the processor executes the computer program to implement the steps of the primary frequency regulation coordinated control method of a flywheel energy storage coupled main frequency regulation unit.

[0020] The present invention provides a computer-readable storage medium having a computer program stored thereon, characterized in that, when the computer program is executed by a processor, it implements the steps of the primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit.

[0021] The beneficial effects of this invention are as follows: This invention can balance the speed and continuity of primary frequency regulation. The flywheel energy storage provides millisecond-level response to meet the requirements of rapid frequency regulation, while the turbine generator set can provide relay support to ensure continuous frequency regulation capability. In addition, the precise power allocation and switching mechanism of this invention can calculate the upper limit of power output through multiple constraints, smooth power transfer to avoid secondary frequency fluctuations, and reduce equipment losses. Finally, this invention adopts flywheel energy storage state self-recovery to automatically return to the optimal energy storage range after frequency regulation, improve system backup capacity, and ensure rapid response for the next frequency regulation. Furthermore, this invention can flexibly adapt to flywheel energy storage and turbine generator sets of different capacity levels, and can also adapt to abnormal operating conditions. It has backup control logic in case of equipment failure, ensuring that the frequency regulation process is uninterrupted and the effect is not reduced. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 The above is a flowchart of a primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit, provided as an embodiment of the present invention.

[0024] Figure 2 The diagram shows the power timing coordination curves of the flywheel and the main frequency regulating unit (considering inertia) under normal operating conditions in a primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulating unit provided in an embodiment of the present invention.

[0025] Figure 3 The automatic flywheel blind-filling control curve is shown in the primary frequency regulation coordinated control method of a flywheel energy storage coupled main frequency regulation unit provided in an embodiment of the present invention when the output of the main frequency regulation unit is limited.

[0026] Figure 4 The diagram shows the disturbance-free recovery control curve (including the SOC change trend) when the flywheel SOC is too high / too low in a primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit provided in an embodiment of the present invention. Detailed Implementation

[0027] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0028] Example 1, referring to Figure 1 This is one embodiment of the present invention, which provides a primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit, comprising: S100: In response to the primary frequency regulation triggering of the main frequency regulation unit, calculate the total power demand for primary frequency regulation and perform priority power allocation based on the total power demand for primary frequency regulation. S200: Based on the priority power allocation result, calculate the continuous output time of flywheel energy storage, start the power transfer process, perform one frequency regulation until the flywheel energy storage output power is zero, and the one frequency regulation action is completed. S300: After a frequency regulation action is completed, the current energy storage state of the flywheel energy storage is calculated, and the energy storage state self-recovery control is activated in response. It should be noted that in existing technologies, the conventional coordination methods between flywheel energy storage and main frequency regulating units (such as thermal power units, compressed air energy storage units, etc.) often use fixed ratios or simple logic for power allocation when dealing with grid frequency fluctuations. This cannot fully leverage the core advantage of flywheel energy storage's millisecond-level fast response to prioritize the smoothing of frequency abrupt changes. When the flywheel's high-power output time is limited by its own capacity and is relatively short, there is a lack of a smooth and controlled power transfer mechanism with the slow-response unit, which can easily lead to a secondary drop or fluctuation in frequency regulation power. At the same time, after a frequency regulation operation, the active management and recovery of the flywheel energy storage's state of charge (SOC) is generally neglected. Under long-term operation, its SOC is prone to deviating from the optimal operating range, which significantly weakens its fast response capability and frequency regulation effect in subsequent continuous frequency regulation events, affecting the overall frequency regulation quality of the system and the service life of the energy storage equipment.

[0029] Therefore, to address the aforementioned issues, the core of the S100-S300 steps lies in using flywheel energy storage as a rapid response unit and turbine generator set as a continuous support unit. Through a three-level control strategy of priority power allocation, smooth power transfer, and energy storage state self-recovery, the speed and continuity of primary frequency regulation are unified, while adapting to various operating scenarios.

[0030] Example 2, refer to Figure 1 This is one embodiment of the present invention, which provides a primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit, comprising: In this embodiment of the invention, in S100, in response to the primary frequency regulation triggering of the main frequency regulation unit, the total power required for primary frequency regulation is calculated, and priority power allocation is performed based on the total power required for primary frequency regulation, including the following steps S101-S102: S101. Acquiring power grid frequency signals includes the following steps: The power grid frequency monitoring module acquires power grid frequency signals in real time at the first target frequency, i.e., a high frequency exceeding 100Hz, and uploads the data to the central control unit. The logic module inside the central control unit calculates the current frequency and the rated frequency in real time. absolute value of deviation The central control unit compares the absolute value of the deviation with the preset frequency dead zone. Then, a comparison was performed.

[0031] when It immediately generates a primary frequency modulation trigger signal and simultaneously calculates the theoretical total power required for primary frequency modulation at the current moment. ,in, The system frequency regulation coefficient serves as the overall target command for subsequent power allocation; Among them, the system frequency modulation coefficient Based on the rated capacity of the unit and preset speed variation rate Sure; It should be noted that, according to GB / T46373—2025, the primary frequency regulation speed unequal rate of compressed air energy storage power stations should be determined to be 4%~5%, and the system frequency regulation coefficient... The calculation formula is: .

[0032] S102. The central control unit reads the current status parameters of the flywheel energy storage system, including the maximum rated power of the flywheel. and the current maximum allowed output power ; The priority allocation logic is executed, with the flywheel energy storage providing the frequency regulation power first. The corresponding output power is calculated. In response to the output power being less than the total power required for primary frequency regulation, the turbine generator set makes up the difference between the output power and the total power required for primary frequency regulation. After making up the difference, retrieve the total power required for primary frequency modulation. , and The minimum of the three, i.e. Generate flywheel target instructions, denoted as Simultaneously, the flywheel target command is sent to the turbine generator set, and after receiving the flywheel target command, power is injected into or absorbed into the power grid; It should be noted that the flywheel target command includes a maintain current load command and a pre-start command.

[0033] flywheel converter receives Upon receiving the command, it responds rapidly within milliseconds, or ≤50ms, to inject or absorb power into the grid. If the calculation results show that the flywheel output is insufficient to cover the total demand, that is... Less than The insufficient power is provided by the turbine generator set, and the control unit will adjust the power difference. As a supplementary instruction, it is sent to the turbine generator set, commanding the turbine generator set to begin supplementing by adjusting valves or combustion rate.

[0034] In this embodiment of the invention, S200 calculates the continuous output time of the flywheel energy storage based on the result of priority power allocation, initiates the power transfer process, performs one frequency adjustment until the flywheel energy storage output power is zero, and the one frequency adjustment action is completed, including the following steps S201-S203: S201. Based on the priority power allocation results, continuously monitor the high-power output duration of the flywheel, calculate the continuous output time of the flywheel's energy storage, and denot it as... : in, The preset duration is 15 seconds. Store the remaining electricity for the flywheel. The maximum rated capacity for flywheel energy storage; When the high-power output duration reaches the flywheel energy storage continuous output time, the control unit triggers the power transfer logic, calculates a safe power change rate based on the physical characteristics of the turbine generator set, and performs power transfer according to the power transfer rate. Indicates the rate of change of power: in, For safety, a value of 0.8 is used; This represents the maximum power change rate of the turbine generator set. This is the rated load of the turbine generator set.

[0035] S202, During the power transfer process, the flywheel energy storage output power Decays over time: Turbine generator set output power As time increases: in, The power transfer start-up time, For flywheel target instructions; Until All frequency regulation power is provided by turbine generator sets; If the actual output power of the turbine generator set is insufficient, the flywheel energy storage will make up the shortfall.

[0036] S203. During the transfer process, the central control unit collects real-time feedback on the actual output power of the turbine generator set, denoted as... ; The feedback value is compared with the theoretical target value. If it is found that the turbine unit's output is limited due to working fluid parameters (such as insufficient inlet pressure), then... The control unit immediately calculates the gap. This gap is then superimposed on the flywheel's control command, forcing the flywheel to increase its output to compensate and ensure that the total power at the grid connection point remains constant.

[0037] In an embodiment of the present invention, after a frequency modulation action is completed in S300, the current energy storage state of the flywheel energy storage is calculated, and in response to the energy storage state self-recovery control, the following steps S301-S302 are included: S301. When the grid frequency returns to the dead zone range, the first frequency regulation operation ends. The current state of charge of the flywheel is read as the percentage of the ratio of the current remaining energy of the flywheel energy storage to the rated maximum energy of the flywheel energy storage, and recorded as follows: : And determine whether the current state of charge of the flywheel is within the optimal range. , where the optimal interval [40%, 60%]; like When the system is not in the preset optimal range, the turbine generator set is controlled to charge or discharge in conjunction with the flywheel energy storage, while maintaining a constant total output power during the adjustment process. Specifically: when At that time, the additional output charging power of the control turbine generator set is denoted as... Charging the flywheel energy storage: in, For the standby power of the turbine generator set, Maximum charging power for flywheel energy storage; when At that time, the control flywheel stores energy and releases the discharge power, denoted as . The corresponding power output is reduced by the turbine generator set: in, This represents the maximum discharge power of the flywheel energy storage.

[0038] Through the synchronized coordination of the above-mentioned "one increase and one decrease" or "one decrease and one increase", the control unit ensures the total active power output of the system. By keeping it unchanged, the flywheel SOC is restored to a standby state of about 50% without causing secondary frequency fluctuations in the power grid. in, Power regulation for flywheel energy storage; To adjust the power output in coordination with the turbine generator set.

[0039] S302. After the energy storage state is restored, abnormal operating conditions are adapted. When the flywheel energy storage fails and cannot output power, the turbine generator set (including but not limited to compressed air energy storage unit and thermal power generator set) directly undertakes all the total power required for primary frequency regulation. When any turbine generator unit fails, the remaining frequency regulation power is jointly provided by the remaining normal turbine generator units and / or flywheel energy storage.

[0040] Example 3, referring to Figures 2-4 As one embodiment of the present invention, a primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit is provided. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through experiments.

[0041] This embodiment is applied to a combined frequency regulation power station consisting of a 10MW compressed air energy storage (CAES) unit and a 1.2MW / 35kWh flywheel energy storage system.

[0042] The main frequency control unit includes a CAES unit, and its rated power is set. Maximum permissible gradeability Simultaneously, set the rated power of the flywheel system. Effective capacity Its control parameter is the frequency dead zone. , speed time Flexibility coefficient .

[0043] This embodiment refers to Figure 2 and Figure 3 The entire process of performing a frequency modulation operation: Primary frequency regulation first assumes a grid frequency drop and calculates the primary frequency regulation demand. ; exist During the specified time period, the control system commands the flywheel output. Verify the output results, specifically the energy released by the flywheel within 15 seconds. This only accounts for 4% of the total capacity of 35kWh, indicating that this configuration has sufficient capacity margin.

[0044] exist After entering the smooth power transfer phase, the CAES unit begins to increase load and calculates the ramp rate. It should be noted that the values ​​used here are all example values, and the CAES command is based on the slope. As the number of flywheel commands increases, the number of commands decreases synchronously.

[0045] like Figure 2 As shown, when considering inertia, the actual CAES output rises in an S-shape due to thermal inertia. The flywheel automatically outputs complementary power to fill the gap in the CAES rise process and keep the total power constant at 0.34MW.

[0046] like Figure 3 As shown, the blind spot compensation scenario is as follows: Assuming that during the transfer process, the CAES can only output a maximum of [output value] due to a decrease in the pressure of the gas storage tank. The control system detected the deviation. ; At this point, the flywheel immediately stops disengaging and maintains / increases its output to [a certain value]. ,like Figure 3 The shaded area in the middle ensures that the grid side is unaware of internal faults.

[0047] like Figure 4 During the state-of-the-art recovery phase, after frequency modulation, if the flywheel SOC is 35% (below the 40% lower limit, requiring charging) or 70% (above the 60% upper limit, requiring discharging), the system sets the discharge power for recovery from excessively high SOC (>60%). Initiate action execution strategy: The flywheel-side operation involves gradually increasing the power to 0.5MW (discharge) via soft-start logic while simultaneously reducing output synchronously, with the power reduction equal to the flywheel discharge amount, thus executing the CAES-side operation. Furthermore, the grid-side operation maintains a reference power level (e.g., 5MW). The loop terminates after the action is executed, such as... Figure 4 As shown, as the flywheel discharges, the SOC curve, i.e., the green dashed line in the figure, gradually decreases. When the SOC reaches the 50% target line, the control logic automatically resets the recovery power to zero, and the recovery process ends smoothly.

[0048] Therefore, this embodiment demonstrates that the control strategy of the present invention can effectively utilize the advantages of the 35kWh large-capacity flywheel, cover the start-up lag of CAES, and achieve uninterrupted operation throughout the entire process.

[0049] Example 4 is an embodiment of the present invention. The above is an illustrative scheme of a primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit. It should be noted that the technical solution of a primary frequency regulation coordinated control system for a flywheel energy storage coupled main frequency regulation unit belongs to the same concept as the technical solution of the above-described primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit. Details not described in detail in the technical solution of the primary frequency regulation coordinated control system for a flywheel energy storage coupled main frequency regulation unit in this embodiment can be found in the description of the above-described technical solution of the primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit.

[0050] This embodiment provides a primary frequency regulation coordinated control system for a flywheel energy storage coupled main frequency regulation unit, including: a power grid frequency monitoring module, a flywheel energy storage system, a turbine generator set, and a central control unit; The power grid frequency monitoring module monitors the power grid frequency in real time, determines whether frequency regulation is triggered, calculates the total power required for one frequency regulation after frequency regulation is triggered, and performs priority power allocation. The flywheel energy storage system calculates the continuous output time of the flywheel energy storage, initiates the power transfer process, and continues until the flywheel energy storage output power is zero; after a frequency regulation action is completed, it calculates the current energy storage state of the flywheel energy storage and determines whether to perform energy storage state self-recovery. The turbine generator set includes compressed air energy storage units, thermal power generator sets, etc. The central control unit executes the control processes of the power grid frequency monitoring module, flywheel energy storage system, and turbine generator set.

[0051] This embodiment also provides an electronic device applicable to a primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit, comprising: a memory and a processor; the memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions to implement the primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit as proposed in the above embodiment.

[0052] This embodiment also provides a storage medium storing a computer program that, when executed by a processor, implements a primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit as proposed in the above embodiment.

[0053] The storage medium proposed in this embodiment and the method for primary frequency regulation coordinated control of a flywheel energy storage coupled main frequency regulation unit proposed in the above embodiments belong to the same inventive concept. Technical details not described in detail in this embodiment can be found in the above embodiments, and this embodiment has the same beneficial effects as the above embodiments.

[0054] Based on the above description of the implementation methods, those skilled in the art can clearly understand that the present invention can be implemented using software and necessary general-purpose hardware, and of course, it can also be implemented using hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk, or optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods of the various embodiments of the present invention.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit, characterized in that, include, In response to the primary frequency regulation triggering of the main frequency regulation unit, the total power demand for primary frequency regulation is calculated, and priority power allocation is performed based on the total power demand for primary frequency regulation. Based on the priority power allocation results, the continuous output time of the flywheel energy storage is calculated, the power transfer process is initiated, and one frequency regulation is performed until the flywheel energy storage output power is zero, and one frequency regulation action is completed. After a frequency regulation operation is completed, the current energy storage state of the flywheel energy storage is calculated, and the energy storage state self-recovery control is activated in response.

2. The primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit as described in claim 1, characterized in that, The response to the primary frequency regulation triggering of the main frequency regulating unit includes: The power grid frequency signal is acquired in real time at the first target frequency, and the frequency deviation is calculated based on the rated frequency of the power grid. In response to a frequency deviation exceeding the frequency dead zone, a frequency modulation action is triggered to perform priority power allocation.

3. The primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit as described in claim 2, characterized in that, The priority power allocation includes: Read the current status parameters of the flywheel energy storage system, including the flywheel's maximum rated power and the current maximum allowable output power; The priority allocation logic is executed, with the flywheel energy storage providing the frequency regulation power first. The corresponding output power is calculated. In response to the output power being less than the total power required for primary frequency regulation, the turbine generator set makes up the difference between the output power and the total power required for primary frequency regulation. After making up the difference, the minimum value between the total power required for primary frequency regulation and the current state parameters is retrieved to generate a flywheel target command. At the same time, the flywheel target command is sent to the turbine generator set. After receiving the flywheel target command, power is injected into or absorbed from the power grid.

4. The primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit as described in claim 3, characterized in that, The priority power allocation also includes: After receiving the flywheel target command and injecting or absorbing power into the grid, the flywheel output is insufficient in response to the calculation results showing that the flywheel target command is less than the total power required for primary frequency regulation. The difference between the flywheel target command and the total power required for primary frequency regulation is sent as a supplementary command to the turbine generator set, instructing the main frequency regulation unit to provide supplementary power.

5. The primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit as described in claim 4, characterized in that, The startup power transfer process includes: Based on the results of priority power allocation, the high power output duration of the flywheel is continuously monitored and the continuous output time of flywheel energy storage is calculated by minimizing the preset duration, the current remaining energy of flywheel energy storage, and the rated maximum energy of flywheel energy storage. When the high-power output duration reaches the flywheel energy storage continuous output time, the power transfer logic is triggered. Based on the physical characteristics of the turbine generator set, a safe power change rate is calculated and power is transferred. The power change rate is represented by the power transfer rate. During the power transfer process, the flywheel energy storage output power decreases over time, while the turbine generator set output power increases over time until the flywheel target command is zero. At this point, all frequency regulation power is provided by the turbine generator set. If the actual output power of the turbine generator set is insufficient, the flywheel energy storage will make up the power.

6. The primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit as described in claim 5, characterized in that, The response to the energy storage state self-recovery control includes: When the grid frequency returns to the dead zone range, the frequency regulation operation ends. The current state of charge of the flywheel is read by the percentage of the ratio of the current remaining energy of the flywheel energy storage to the rated maximum energy of the flywheel energy storage. It also determines whether the current state of charge of the flywheel is in the optimal range. If the current state of charge of the flywheel is not in the preset optimal range, it controls the turbine generator set to charge or discharge in conjunction with the flywheel energy storage, and keeps the total output power of the system unchanged during the adjustment process. When the current state of charge of the flywheel is less than the minimum value of the optimal range, the turbine generator set is controlled to output additional charging power, and the flywheel energy storage is charged by minimizing the standby power of the turbine generator set and the maximum charging power of the flywheel energy storage. When the current state of charge of the flywheel is greater than the maximum value of the optimal range, the flywheel energy storage releases discharge power by selecting the minimum value among the difference between the current remaining energy of the flywheel energy storage and the rated maximum energy and the maximum discharge power of the flywheel energy storage, so that the turbine generator set reduces the corresponding power output.

7. The primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit as described in claim 6, characterized in that, This also includes adapting to abnormal operating conditions after the energy storage state has completed its self-recovery: When the flywheel energy storage fails and cannot output power, the turbine generator set directly undertakes all the total power required for primary frequency regulation; When any turbine generator unit fails, the remaining frequency regulation power is jointly provided by the remaining normal turbine generator units and flywheel energy storage.

8. A primary frequency regulation coordinated control system for a flywheel energy storage coupled main frequency regulation generator unit, employing the primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation generator unit as described in any one of claims 1 to 7, characterized in that, include: Grid frequency monitoring module, flywheel energy storage system, turbine generator set, central control unit; The power grid frequency monitoring module, in response to the primary frequency regulation triggering of the main frequency regulation unit, calculates the total power demand for primary frequency regulation and performs priority power allocation based on the total power demand for primary frequency regulation. The flywheel energy storage system calculates the continuous output time of the flywheel energy storage based on the priority power allocation result, initiates the power transfer process, performs one frequency regulation until the flywheel energy storage output power is zero, and the one frequency regulation action is completed; after the one frequency regulation action is completed, the current energy storage state of the flywheel energy storage is calculated, and the energy storage state self-recovery control is responded to. The turbine generator set includes, but is not limited to, compressed air energy storage units and thermal power generator sets; The central control unit executes the control processes of the power grid frequency monitoring module, flywheel energy storage system, and turbine generator set.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit as described in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the primary frequency regulation coordinated control method for a flywheel energy storage coupled main frequency regulation unit as described in any one of claims 1 to 7.

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