A flywheel energy storage system frequency modulation control method and device and storage medium

Abstract

The application provides a flywheel energy storage system frequency modulation control method and device and a storage medium, and belongs to the technical field of frequency modulation control. The method comprises the following steps: acquiring a current time and importing a primary frequency modulation demand target value; if the current time is between 0 time and T1 time, the primary frequency modulation demand target value is adjusted to obtain a first flywheel energy storage system control instruction value, and the flywheel energy storage system is controlled according to the first flywheel energy storage system control instruction value. The application can meet the primary frequency modulation performance examination condition of the wind power plant under the condition of reducing the fan group call, so as to achieve the purpose of efficient utilization of equipment, improvement of the primary frequency modulation auxiliary service ability, reduction of the electric energy support pressure of the flywheel energy storage system and protection of the health of the flywheel energy storage system.

Description

Technical Field

[0001] This invention mainly relates to the field of frequency modulation control technology, specifically to a frequency modulation control method, device, and storage medium for a flywheel energy storage system. Background Technology

[0002] In recent years, new energy sources have gradually become one of the main sources of power generation, while the role of traditional thermal power will shift from being the main power source to a supporting and regulating power source. This rapid and profound change in the power structure poses a significant threat to the frequency security of the power grid, especially given the widespread susceptibility of wind and solar resources to natural influences and inaccurate power forecasting. Therefore, the real-time power balance and frequency security of the power grid will face enormous challenges. Some upgraded new energy power plants possess primary frequency regulation capabilities, but their performance in grid ancillary service assessments still requires optimization. Therefore, providing a reliable and high-performance primary frequency regulation optimization scheme will be one of the future development directions.

[0003] Flywheel energy storage systems are characterized by rapid response, precise control, and high power density, making them suitable for power regulation applications with short time scales. They also boast a long cycle life, meeting the demands of high-frequency, short-term high-power dispatch, thus exhibiting high compatibility with primary frequency regulation applications. Common characteristics of grid frequency exceedances include a high proportion of short-term frequency exceedances and a frequency deviation that is high at the beginning and low at the end. Traditional primary frequency regulation strategies for wind farms exhibit frequent turbine dispatch when facing actual primary frequency regulation demands, with some farms showing poor overall active power control and insufficient integral power contribution rates to meet dispatch requirements. Considering the current stringent primary frequency regulation assessment requirements for power grids in various regions, rationally allocating active power sources and improving active power regulation strategies can maximize benefits for enhancing the grid-connected ancillary service capabilities of new energy sources within the framework of the "rewarding excellence and penalizing poor performance" rules in the "two detailed rules," and also contribute to the stable frequency regulation of the power grid. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a frequency regulation control method, device and storage medium for a flywheel energy storage system, which addresses the shortcomings of the prior art.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A frequency regulation control method for a flywheel energy storage system, comprising the following steps: Obtain the current time and import the target value for frequency regulation; If the current time is between time 0 and time T1, the target value of the primary frequency regulation demand is adjusted to obtain the control command value of the first flywheel energy storage system, and the flywheel energy storage system is controlled according to the control command value of the first flywheel energy storage system. Import the real-time active power value and frequency regulation parameters of the wind turbine group. If the current time is between time T1 and time T2, perform frequency regulation analysis on the target value of primary frequency regulation requirement and the real-time active power value of the wind turbine group, and control the flywheel energy storage system and the wind turbine group according to the frequency regulation analysis results. If the current time is between time T2 and time T3, then the frequency regulation parameters, the target value of the primary frequency regulation requirement, and the real-time value of the active power of the wind turbine group are re-analyzed, and the flywheel energy storage system and the wind turbine group are controlled according to the re-analysis results. If the current time is greater than T3, then frequency regulation calculations are performed on the target value of the primary frequency regulation demand and the real-time value of the active power of the wind turbine group, and the flywheel energy storage system and the wind turbine group are controlled according to the frequency regulation calculation results.

[0006] Another technical solution of the present invention to solve the above-mentioned technical problems is as follows: A frequency regulation control device for a flywheel energy storage system, comprising: The import module is used to obtain the current time and import the target value for frequency regulation. The adjustment processing module is used to adjust the target value of the primary frequency regulation demand if the current time is between time 0 and time T1, to obtain the control command value of the first flywheel energy storage system, and to control the flywheel energy storage system according to the control command value of the first flywheel energy storage system. The import module is also used to import the real-time active power value and frequency regulation parameters of the wind turbine group; The frequency regulation analysis module is used to perform frequency regulation analysis on the target value of the primary frequency regulation requirement and the real-time value of the active power of the wind turbine group if the current time is between time T1 and time T2, and to control the flywheel energy storage system and the wind turbine group according to the frequency regulation analysis results. The re-investment analysis module is used to perform re-investment analysis on the frequency regulation parameters, the primary frequency regulation demand target value, and the real-time value of the active power of the wind turbine group if the current time is between time T2 and time T3, and to control the flywheel energy storage system and the wind turbine group according to the re-investment analysis results; The frequency regulation calculation module is used to perform frequency regulation calculations on the primary frequency regulation demand target value and the real-time value of the active power of the wind turbine group if the current time is greater than T3 time, and to control the flywheel energy storage system and the wind turbine group according to the frequency regulation calculation results.

[0007] Based on the above-mentioned frequency regulation control method for a flywheel energy storage system, the present invention also provides a frequency regulation control system for a flywheel energy storage system.

[0008] Another technical solution of the present invention to solve the above-mentioned technical problems is as follows: a flywheel energy storage system frequency regulation control system, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the flywheel energy storage system frequency regulation control method described above is implemented.

[0009] Based on the above-mentioned frequency regulation control method for a flywheel energy storage system, the present invention also provides a computer-readable storage medium.

[0010] Another technical solution of the present invention to solve the above-mentioned technical problems is as follows: a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the frequency regulation control method of the flywheel energy storage system as described above is implemented.

[0011] The beneficial effects of this invention are as follows: By adjusting the primary frequency regulation demand target value between time 0 and time T1, a control command value for the first flywheel energy storage system is obtained. The flywheel energy storage system is then controlled based on this control command value. If the current time is between time T1 and time T2, frequency regulation analysis is performed on the primary frequency regulation demand target value and the real-time active power value of the wind turbine group. The flywheel energy storage system and the wind turbine group are then controlled based on the frequency regulation analysis results. If the current time is between time T2 and time T3, a re-activation analysis is performed on the frequency regulation parameters, the primary frequency regulation demand target value, and the real-time active power value of the wind turbine group. The flywheel energy storage system is then controlled based on the re-activation analysis results. The energy storage system and wind turbine group are controlled. If the current time is greater than T3, frequency regulation calculations are performed on the primary frequency regulation demand target value and the real-time active power value of the wind turbine group. Based on the frequency regulation calculation results, the flywheel energy storage system and wind turbine group are controlled. This can meet the primary frequency regulation performance assessment conditions of the wind farm while reducing the wind turbine group's call time. This achieves the purpose of efficient equipment utilization, improves the primary frequency regulation auxiliary service capability, reduces the electrical energy support pressure on the flywheel energy storage system, and protects the health of the flywheel energy storage system itself. It solves the problems of rapid changes in the primary frequency regulation demand of the entire field, slow adjustment speed of the wind turbine group, and poor adjustment stability control deviation capability of the wind turbine group. Attached Figure Description

[0012] Figure 1 This is one of the flowcharts illustrating the frequency regulation control method for a flywheel energy storage system provided in an embodiment of the present invention; Figure 2 A schematic diagram of the frequency-active power droop characteristic curve of a wind power station participating in primary frequency regulation in the frequency regulation control method of the flywheel energy storage system provided in the embodiment of the present invention. Figure 3 This is a second schematic flowchart of the frequency regulation control method for a flywheel energy storage system provided in an embodiment of the present invention; Figure 4 The third flowchart illustrates the frequency regulation control method for a flywheel energy storage system provided in this embodiment of the invention. Figure 5 This is a block diagram of a frequency regulation control device for a flywheel energy storage system provided in an embodiment of the present invention. Detailed Implementation

[0013] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0014] Figure 1 This is a flowchart illustrating a frequency regulation control method for a flywheel energy storage system provided in an embodiment of the present invention.

[0015] like Figure 1 As shown, a frequency regulation control method for a flywheel energy storage system includes the following steps: S1: Obtain the current time and import the target value for frequency regulation; S2: If the current time is between time 0 and time T1, the target value of the primary frequency regulation demand is adjusted to obtain the control command value of the first flywheel energy storage system, and the flywheel energy storage system is controlled according to the control command value of the first flywheel energy storage system. S3: Import the real-time value of the active power of the wind turbine group and the frequency regulation parameters. If the current time is between time T1 and time T2, perform frequency regulation analysis on the target value of the primary frequency regulation requirement and the real-time value of the active power of the wind turbine group, and control the flywheel energy storage system and the wind turbine group according to the frequency regulation analysis results. S4: If the current time is between time T2 and time T3, then perform a re-investment analysis on the frequency regulation parameters, the target value of the primary frequency regulation demand, and the real-time value of the active power of the wind turbine group, and control the flywheel energy storage system and the wind turbine group according to the re-investment analysis results; S5: If the current time is greater than T3, then frequency regulation calculation is performed on the target value of the primary frequency regulation demand and the real-time value of the active power of the wind turbine group, and the flywheel energy storage system and the wind turbine group are controlled according to the frequency regulation calculation results.

[0016] Preferably, time T1 can be 3~5s, T2 can be 10~12s, and T3 can be 60s.

[0017] It should be understood that the initial action time T1 of the wind turbine group is set, and the rapid action of the flywheel energy storage is used to replace the slow action of the wind turbine group before T1, thereby reducing the action lag time assessment of the entire field's primary frequency regulation and avoiding frequent actions of the wind turbine group.

[0018] Specifically, the starting time of the continuous optimization action of the integral power contribution rate is T2. Between T1 and T2, the wind turbine group's actions are adjusted according to the control command, and the flywheel energy storage gradually withdraws from power regulation according to the corresponding rules, thereby reducing the energy support pressure of the flywheel energy storage.

[0019] It should be understood that within the period from T2 to the longest assessment time of a single effective primary frequency regulation (T3, which is generally 60s), the flywheel energy storage (i.e., the flywheel energy storage system) will engage its optimization function based on the characteristics of the integral power contribution rate, and continuously correct and adjust the integral power contribution rate of this primary frequency regulation to a reasonable range.

[0020] Specifically, after T3, the flywheel energy storage (i.e., the flywheel energy storage system) will normally shut down, and the wind turbine group will normally start adjustment until the primary frequency regulation action signal disappears.

[0021] In the above embodiments, by adjusting the primary frequency regulation demand target value between time 0 and time T1, the control command value of the first flywheel energy storage system is obtained. The flywheel energy storage system is then controlled according to this control command value. If the current time is between time T1 and time T2, frequency regulation analysis is performed on the primary frequency regulation demand target value and the real-time active power value of the wind turbine group. The flywheel energy storage system and the wind turbine group are then controlled based on the frequency regulation analysis results. If the current time is between time T2 and time T3, a re-activation analysis is performed on the frequency regulation parameters, the primary frequency regulation demand target value, and the real-time active power value of the wind turbine group. The flywheel energy storage system is then controlled based on the re-activation analysis results. The system controls the energy storage system and wind turbine cluster. If the current time is greater than T3, frequency regulation calculations are performed on the primary frequency regulation demand target value and the real-time active power value of the wind turbine cluster. Based on the frequency regulation calculation results, the flywheel energy storage system and wind turbine cluster are controlled. This can meet the primary frequency regulation performance assessment conditions of the wind farm while reducing the wind turbine cluster's usage, thereby achieving the purpose of efficient equipment utilization, improving the primary frequency regulation auxiliary service capability, reducing the electrical energy support pressure on the flywheel energy storage system, and protecting the health of the flywheel energy storage system itself. This solves the problems of rapid changes in the primary frequency regulation demand of the entire field, slow adjustment speed of the wind turbine cluster, and poor adjustment stability control deviation capability of the wind turbine cluster.

[0022] Optionally, as an embodiment of the present invention, the process of performing frequency modulation processing on the primary frequency regulation demand target value to obtain the control command value of the first flywheel energy storage system includes: The control command value of the first flywheel energy storage system is obtained by calculating the primary frequency regulation demand target value using the first formula, wherein the first formula is: , in, This is the control command value for the first flywheel energy storage system. This is the target value for primary frequency regulation requirements.

[0023] It should be understood that the principle for configuring the initial operation time T1 of the wind turbine group is as follows: based on the basic condition of filtering out a high proportion of invalid short-duration disturbances, by statistically analyzing the frequency over-limit duration data of the local power grid within a certain period of time, after T1, the wind turbine group operates according to the frequency regulation demand command, and the flywheel gradually exits according to the exit rules. A reasonable T1 configuration is sufficient, generally T1 is taken as 3~5s.

[0024] Specifically, during the 0-T1 period after the primary frequency regulation is triggered, the flywheel energy storage (i.e., the flywheel energy storage system) adjusts according to the actual demand of the primary frequency regulation (i.e., the target value of the primary frequency regulation demand). The control target command of the flywheel energy storage (i.e., the control command value of the first flywheel energy storage system) is as follows: , Where P FES_tgt The control target command for flywheel energy storage (i.e., the control command value of the first flywheel energy storage system), P Demand This is the real-time demand target value for primary frequency regulation (i.e., the primary frequency regulation demand target value).

[0025] In the above embodiments, the control command value of the first flywheel energy storage system is obtained by frequency regulation processing of the primary frequency regulation demand target value. This can meet the primary frequency regulation performance assessment conditions of the wind farm while reducing the call of wind turbine groups, thereby achieving the purpose of efficient equipment utilization and improving the primary frequency regulation auxiliary service capability.

[0026] Optionally, as an embodiment of the present invention, the process of performing frequency regulation analysis on the primary frequency regulation demand target value and the real-time active power value of the wind turbine group, and controlling the flywheel energy storage system and the wind turbine group based on the frequency regulation analysis results includes: Frequency regulation calculations are performed on the primary frequency regulation demand target value and the real-time active power value of the wind turbine group to obtain the first wind turbine group control target command value and the second flywheel energy storage system control command value; The flywheel energy storage system is controlled according to the control command value of the second flywheel energy storage system, and the wind turbine group is controlled according to the control target command value of the first wind turbine group; The frequency regulation parameters, the target value of the primary frequency regulation requirement, and the control command value of the second flywheel energy storage system are analyzed to obtain a frequency regulation stop command, and the flywheel energy storage system is controlled according to the frequency regulation stop command.

[0027] Specifically, the principle for configuring the T2 start time of the continuous optimization action for the integral power contribution rate is as follows: To ensure the integral power contribution rate remains within a reasonable range, and address any adjustment deviations in the frequency regulation of the wind turbine group, the flywheel energy storage should be activated in a timely manner to optimize the frequency regulation effect of the entire wind turbine network. Once the integral power contribution rate is satisfied, the flywheel energy storage adjustment should be promptly discontinued. A reasonable T2 configuration is sufficient. It is recommended to avoid exceeding the minimum effective assessment time for a single frequency regulation (generally 15 seconds). A T2 of 10-12 seconds is typically used. Before the minimum effective time for a single frequency regulation arrives, a period of time (3-5 seconds) should be reserved to use flywheel energy storage to preemptively correct the integral power contribution rate, ensuring the assessment effect of this frequency regulation.

[0028] In the above embodiments, frequency regulation analysis is performed on the primary frequency regulation demand target value and the real-time active power value of the wind turbine group. Based on the frequency regulation analysis results, the flywheel energy storage system and the wind turbine group are controlled, which reduces the electrical energy support pressure of the flywheel energy storage system, achieves the purpose of protecting the health of the flywheel energy storage system itself, and solves the problems of rapid changes in the primary frequency regulation demand of the entire field, slow adjustment speed of the wind turbine group, and poor adjustment stability control deviation capability of the wind turbine group.

[0029] Optionally, as an embodiment of the present invention, the process of performing frequency regulation calculations on the primary frequency regulation demand target value and the real-time active power value of the wind turbine group to obtain the first wind turbine group control target command value and the second flywheel energy storage system control command value includes: The first set of equations is used to calculate the target value of the primary frequency regulation demand and the real-time value of the active power of the wind turbine group to obtain the control target command value of the first wind turbine group and the control command value of the second flywheel energy storage system. The first set of equations is as follows: , in, This is the target control command value for the first wind turbine group. The target value for primary frequency regulation demand. This is the control command value for the second flywheel energy storage system. This represents the real-time active power of the wind turbine group.

[0030] Specifically, during the T1-T2 period after a frequency regulation trigger, the commands for the wind turbine group and flywheel energy storage (i.e., the control target command value for the first wind turbine group and the control command value for the second flywheel energy storage system) are as follows: , Where P Wind_tgt P represents the control target command value for the wind turbine group (i.e., the control target command value for the first wind turbine group). Wind_real The active power of the wind turbine group is the real-time value. This invention takes the case where the primary frequency regulation direction is positive as an example, and vice versa.

[0031] In the above embodiments, frequency regulation calculations are performed on the primary frequency regulation demand target value and the real-time active power value of the wind turbine group to obtain the first wind turbine group control target command value and the second flywheel energy storage system control command value. This reduces the electrical energy support pressure on the flywheel energy storage system and achieves the purpose of protecting the health of the flywheel energy storage system itself.

[0032] Optionally, as an embodiment of the present invention, the frequency regulation parameters include initial reference power, disturbance boundary coefficient, maximum amplitude limit of primary frequency regulation, rated power of the entire wind farm, lower limit of integral power qualification rate, and flywheel exit dead zone coefficient; The process of performing frequency regulation stop analysis on the frequency regulation parameters, the primary frequency regulation demand target value, and the control command value of the second flywheel energy storage system to obtain the frequency regulation stop command includes: If the initial reference power, the disturbance boundary coefficient, the maximum amplitude limit of the primary frequency regulation, the rated power of the entire wind farm, the lower limit of the integral energy qualification rate, the flywheel exit dead zone coefficient, the primary frequency regulation demand target value, and the control command value of the second flywheel energy storage system meet the frequency regulation stop conditions, then a frequency regulation stop command is generated. The frequency regulation stop conditions are: , in, This is the frequency modulation requirement deviation. It is an absolute value function. The target value for primary frequency regulation demand. As the initial reference power, This is the disturbance boundary coefficient. This is the maximum amplitude limit for a single frequency modulation adjustment. This refers to the rated power of the entire wind farm. This is the control command value for the second flywheel energy storage system. This is the lower limit for the qualified rate of the points-based electricity consumption. This is the flywheel exit dead zone coefficient.

[0033] It should be understood that, in order to ensure efficient equipment utilization and extend equipment life, a primary frequency regulation exit logic is set for flywheel energy storage. Once the flywheel energy storage completes its exit, the target value returns to 0. Taking the requirements of a certain regional power grid as an example, the required range of the primary frequency regulation integral qualification rate K of the local power grid is [K]. min ,K max The absolute value of the maximum adjustment amount in a single frequency modulation is K. PFC *P n During the adjustment process, the large-amplitude disturbance of primary frequency modulation and the small-amplitude disturbance of primary frequency modulation are distinguished and segmented.

[0034] Specifically, when P Wind_real(i.e., real-time active power of the wind turbine group) relative to P Wind_tgt When the tracking effect of the target command value (i.e., the control target value of the first wind turbine group) is good, P FES_tgt (That is, the control command value of the second flywheel energy storage system) will gradually decrease, setting a trigger exit logic condition to avoid the subsequent small-scale long-term tracking process of the flywheel energy storage. When the primary frequency regulation disturbance is large, when the actual regulation amount / theoretical regulation amount (P) Wind_real P Wind_tgt The absolute value of the ratio of the difference between the two and P0 is greater than K. min If the duration exceeds Δt1 (typically 3s), it can be considered that the output of the wind turbine cluster has met the minimum value required for the integral power contribution rate, and the output of the wind turbine cluster has the ability to continuously track P. Demand The ability to maintain the contribution rate of electricity generated during the period after exiting the system will continue to be within K. min The above are the basic conditions for the flywheel to completely disengage. When the frequency regulation disturbance is small, an active power regulation deviation criterion is added, that is, the maximum value of the two target values ​​is taken to reduce the small-amplitude, long-term, and continuous adjustment of flywheel energy storage. When the following conditions are met, flywheel energy storage can execute the normal disengagement logic.

[0035] , As shown in Table 1, the main purpose of setting the exit target for flywheel energy storage is to achieve the premise of initially achieving a qualified integral power contribution rate when the output of the wind turbine group is well tracking the primary frequency regulation demand, thereby reducing the unnecessary call time of flywheel energy storage and thus maintaining the health of the equipment. Table 1 shows typical values.

[0036] Table 1

[0037] In the above embodiments, frequency modulation parameters, primary frequency modulation demand target value, and control command value of the second flywheel energy storage system are analyzed to obtain frequency modulation stop command, thereby reducing unnecessary call time of the flywheel energy storage system and achieving the purpose of maintaining equipment health.

[0038] Optionally, as an embodiment of the present invention, the frequency regulation parameters include integral power qualification rate, maximum effective output of flywheel, lower limit of integral power qualification rate, upper limit of integral power qualification rate, actual adjustment amount of fan, and theoretical adjustment amount of fan; The process of performing a re-implementation analysis on the frequency regulation parameters, the primary frequency regulation demand target value, and the real-time active power value of the wind turbine group, and controlling the flywheel energy storage system and the wind turbine group based on the re-implementation analysis results, includes: S41: Determine whether the integral power qualification rate meets the operating conditions. If it does, proceed to S42; otherwise, proceed to S43. The operating conditions are: , in, For the pass rate of points-based electricity consumption, It is an absolute value function; S42: The third flywheel energy storage system control command value is obtained by calculating the primary frequency regulation demand target value, the maximum effective output of the flywheel, and the real-time active power value of the wind turbine group using the second formula. The flywheel energy storage system is then controlled according to the third flywheel energy storage system control command value. The second formula is: , in, This is the control command value for the third flywheel energy storage system. For symbolic functions, The target value for primary frequency regulation demand. This represents the real-time active power of the wind turbine cluster. To achieve the maximum effective output of the flywheel; S43: Construct an interval of the integral power qualification rate with the lower limit of the integral power qualification rate as the minimum value and the upper limit of the integral power qualification rate as the maximum value; S44: Determine whether the ratio of the actual adjustment amount of the fan to the theoretical adjustment amount of the fan is within the range of the integral power qualification rate within the preset fan output qualification time. If yes, execute S45; if no, execute S46. S45: Generate a frequency modulation exit command and control the flywheel energy storage system according to the frequency modulation exit command; S46: Calculate the target value of the primary frequency regulation demand and the real-time value of the active power of the wind turbine group using the first set of equations to obtain the target command value of the second wind turbine group control and the control command value of the fourth flywheel energy storage system. Control the flywheel energy storage system according to the control command value of the fourth flywheel energy storage system and control the wind turbine group according to the target command value of the second wind turbine group control.

[0039] It should be understood that during the T2-T3 period after the first frequency regulation is triggered, the wind turbine group adjustment command tracks the frequency regulation demand command action, which is the same as the second stage. When the integral power contribution rate indicator does not meet the assessment conditions, the flywheel energy storage enters the re-entry logic.

[0040] Specifically, the integrated energy qualification rate K (i.e., the integrated energy qualification rate) should be brought back to the effective range as soon as possible. After the operating condition (abs(K-1)<0.05) is met, the restart logic will be initiated. The output of the flywheel energy storage in the restart logic is shown in the following formula: , The flywheel energy storage output command targets the maximum effective output in the positive direction. This will cause the integral energy contribution rate to continuously approach 1, thus achieving the goal of quickly adjusting the cumulative integral energy contribution rate back to a reasonable range. Two scenarios are considered here: 1. Before time period T2, the ratio of the actual wind turbine regulation to the theoretical regulation (i.e., the ratio of the actual wind turbine regulation to the theoretical wind turbine regulation) is consistently less than K. min This results in insufficient contribution rate of integrated power generation; 2. Before the T2 period, the wind turbines shut down prematurely, and the ratio of actual regulation to theoretical regulation (i.e., the ratio of the actual regulation to the theoretical regulation of the wind turbines) is consistently greater than 1, or even greater than K. max This results in an excessively high contribution rate of the accumulated electricity.

[0041] It should be understood that the wind turbine fleet's output capacity is assessed. If the wind turbine fleet's output capacity meets the conditions, the restart logic is exited. If the wind turbine fleet's output capacity does not meet the conditions, the flywheel energy storage will continue to execute the restart logic and track the target difference. The wind turbine fleet output capacity assessment method for the restart logic is: determining whether the actual regulation amount / theoretical regulation amount (i.e., the ratio of the actual regulation amount of the wind turbine to the theoretical regulation amount of the wind turbine) is within [K]. min, K max After maintaining the wind turbine output within the specified range for a time Δt2 (typically 5s), if the conditions are met, the flywheel energy storage regulation will exit; otherwise, the flywheel energy storage output command will be as shown in the first set of equations.

[0042] In the above embodiments, the frequency regulation parameters, the target value of primary frequency regulation demand, and the real-time value of the active power of the wind turbine group are re-analyzed, and the flywheel energy storage system and the wind turbine group are controlled according to the re-analysis results. This achieves the goal of quickly adjusting the cumulative integral power contribution rate back to a reasonable range, reducing the power support pressure of the flywheel energy storage system, and achieving the goal of protecting the health of the flywheel energy storage system itself.

[0043] Optionally, as an embodiment of the present invention, the process of performing frequency regulation calculations on the primary frequency regulation demand target value and the real-time active power value of the wind turbine group, and controlling the flywheel energy storage system and the wind turbine group based on the frequency regulation calculation results includes: The first set of equations is used to calculate the target value of the primary frequency regulation demand and the real-time value of the active power of the wind turbine group to obtain the control target command value of the third wind turbine group and the control command value of the fifth flywheel energy storage system. The flywheel energy storage system is controlled according to the control command value of the fifth flywheel energy storage system, and the wind turbine group is controlled according to the control target command value of the third wind turbine group.

[0044] It should be understood that after the frequency regulation trigger duration exceeds T3, the flywheel energy storage exits the frequency regulation function and enters the self-recovery state judgment logic. The wind turbine group adjustment command tracks the frequency regulation demand command action, as shown in the first set of equations, until the frequency regulation action signal disappears.

[0045] In the above embodiments, frequency regulation calculations are performed on the primary frequency regulation demand target value and the real-time active power value of the wind turbine group, and the flywheel energy storage system and wind turbine group are controlled according to the frequency regulation calculation results. This reduces the electrical energy support pressure on the flywheel energy storage system and achieves the purpose of protecting the health of the flywheel energy storage system itself.

[0046] Alternatively, as another embodiment of the present invention, the basic principle of the present invention is: considering the common characteristics of grid frequency exceeding limits, flywheel energy storage and wind turbine groups are specifically called up, and the primary frequency regulation performance assessment conditions of the wind farm are met while reducing the call of wind turbine groups, thereby achieving the purpose of efficient equipment utilization and improving the primary frequency regulation auxiliary service capability.

[0047] Alternatively, as another embodiment of the present invention, such as Figure 2 As shown, the frequency-active power droop characteristic curve function of a typical wind farm participating in primary frequency regulation according to this invention is as follows: , In the formula: f d This is a frequency modulation dead zone. f n The system's rated frequency, in Hz. P 0 The initial power of the system. P n The rated power for the entire field is in MW. δ % represents the primary frequency modulation droop rate, configured with a set of typical parameters ( f d It is 50±0.05Hz. δ The percentage is 3%, and the load limit for a single frequency regulation action is ±10%. P n For example, its curve diagram is as follows: Figure 2 As shown.

[0048] Alternatively, as another embodiment of the present invention, such as Figure 3 and 4 As shown, the key points and areas to be protected in this invention are as follows: One of the key points is that by flexibly configuring the action time parameter T1, unnecessary and repetitive actions of the wind turbine cluster are reduced, thereby achieving the strategy and design method of protecting the wind turbine cluster equipment itself. When the frequency regulation action time exceeds T1, the wind turbine cluster control command is promptly issued to reduce the pressure on the electric energy support of the flywheel energy storage and achieve the purpose of protecting the health of the flywheel energy storage equipment itself.

[0049] One of the key points is that the integrated power contribution rate can be intervened in advance by flexibly configuring the time parameter T2. During the period from T1 to T2, the flywheel energy storage exits according to the exit rules, and the integrated power contribution rate is not included in the control. In response to the problem that the integrated power is unqualified after exceeding the minimum effective duration and the duration of frequency exceeding the limit is unpredictable, an early intervention scheme is proposed. This scheme specifically solves the problems of rapid changes in the primary frequency regulation demand, slow adjustment speed of the wind turbine group, and poor adjustment stability control deviation capability of the wind turbine group. It is a strategy and design method that effectively supports the integrated power contribution rate of the entire primary frequency regulation process.

[0050] One of the key points is to achieve an efficient utilization strategy and design method for the flywheel energy storage system during the call-up process by flexibly configuring the input and output mechanisms of flywheel energy storage and coordinating with the system regulation effect of the wind turbine group.

[0051] One of the points to be protected is: the normal exit logic design of flywheel energy storage after the wind turbine group is put into active power control (second stage, T1-T2 period).

[0052] One of the points to be protected is: the configuration should consider the flywheel energy storage re-connection logic design under the constraint that the integral power qualification rate reaches the qualification condition (the third stage, re-connection start-up and re-connection maintenance during the T2-T3 period).

[0053] Alternatively, as another embodiment of the present invention, such as Figure 3 and 4 As shown, the time configuration concept of this invention is as follows: 1. In the first stage, configure the start time T1 of the wind turbine group. Before T1, replace the slow action of the wind turbine group with the fast action of the flywheel energy storage, thereby reducing the action lag time assessment of the entire field's first frequency regulation and avoiding frequent actions of the wind turbine group. 2. In the second stage, the starting time of the continuous optimization action of the configuration integral power contribution rate is T2. Between T1 and T2, the wind turbine group action is adjusted according to the control command, and the flywheel energy storage gradually withdraws from power regulation according to the corresponding rules, thereby reducing the energy support pressure of flywheel energy storage. 3. In the third stage, from T2 to the longest assessment time of a single effective frequency regulation T3 (generally 60s), the flywheel energy storage will use the optimization function based on the characteristics of the integral power contribution rate to continuously correct and adjust the integral power contribution rate of this frequency regulation to a reasonable range. 4. In the fourth stage, after T3, the flywheel energy storage is normally deactivated, and the wind turbine group is normally regulated until the primary frequency regulation signal disappears.

[0054] Alternatively, as another embodiment of the present invention, the key points of the present invention are as follows: (i) Communication and functional logic coordination between primary frequency regulation and flywheel energy storage The control logic shown in this invention is implemented in a primary frequency regulation control system and relies on the primary frequency regulation control server hardware. The primary frequency regulation hardware needs to collect real-time data such as the grid connection point frequency and active power, and needs to establish a communication connection with the flywheel energy storage. Data interaction can be achieved through conventional IEC104 and Modbus_TCP communication protocols, ensuring that the data interaction cycle should not exceed 0.5s.

[0055] (ii) Time point configuration in the primary frequency modulation call rule The most crucial logic in all the calling rules shown in this invention lies in phased calling, gradually activating the control logic of different stages. Specifically, a properly configured parameter T1 can reduce the frequency of wind turbine cluster calls and allow for the gradual and normal withdrawal of flywheel energy storage, while a properly configured T2 can enable the continuous correction of the integral energy qualification rate in advance. The specific timing parameters depend on the actual application.

[0056] (III) Logic and parameter settings for normal deactivation and reactivation of flywheel energy storage in the primary frequency regulation call rules The flywheel energy storage normal exit logic shown in this invention, under the premise of calculating the integral energy contribution rate, orderly corrects the active power output of the flywheel energy storage to achieve the effect of normal flywheel exit.

[0057] The flywheel energy storage re-energization logic shown in this invention ensures that the integral power contribution rate is within a reasonable range, assesses the power output capacity of the wind turbine group, and continuously adjusts the flywheel energy storage output as needed, thereby achieving the purpose of correcting the qualification rate of the integral power of the current frequency regulation.

[0058] The main parameters include the upper and lower limits of the expected value of the integral power qualification rate, the boundary parameters of large and small disturbances, and the qualified time of wind turbine output. By reasonably configuring the above parameters, the call boundary conditions of different active power regulation mechanisms can be effectively determined.

[0059] In summary, this invention has significant advantages in the application of primary frequency regulation in wind farms, especially in wind farms where the effect of primary frequency regulation retrofit is poor. The design scheme takes into account the healthy operation of equipment and reduces the pressure of primary frequency regulation assessment, resulting in significant economic benefits.

[0060] Optionally, as another embodiment of the present invention, the main implementation of the present invention includes configuring the hardware and network communication cable connection of the primary frequency regulation control system, configuring the data communication between the primary frequency regulation control system and the wind farm energy management platform, configuring the software program of the primary frequency regulation control system containing control logic, configuring the data communication between the primary frequency regulation control system and the flywheel control system, and configuring the corresponding software program of the flywheel control system.

[0061] The primary frequency regulation control system, while realizing the real-time acquisition of power and frequency at the grid connection point, is configured with the logic described in this invention to realize functions such as monitoring the active power control status of the wind turbine group, monitoring the active power control status of the flywheel energy storage, calculating the active power control command of the wind turbine group, calculating the active power control of the flywheel energy storage, and judging the activation and deactivation logic.

[0062] Both the wind turbine energy management system and the flywheel energy storage control system need to be configured with corresponding logic to receive instructions from the primary frequency regulation control system and feed back the execution results and monitoring results to the primary frequency regulation control system.

[0063] Figure 5 This is a block diagram of a frequency regulation control device for a flywheel energy storage system provided in an embodiment of the present invention.

[0064] Alternatively, as another embodiment of the present invention, such as Figure 5 As shown, a frequency regulation control device for a flywheel energy storage system includes: The import module is used to obtain the current time and import the target value for frequency regulation. The adjustment processing module is used to adjust the target value of the primary frequency regulation demand if the current time is between time 0 and time T1, to obtain the control command value of the first flywheel energy storage system, and to control the flywheel energy storage system according to the control command value of the first flywheel energy storage system. The import module is also used to import the real-time active power value and frequency regulation parameters of the wind turbine group; The frequency regulation analysis module is used to perform frequency regulation analysis on the target value of the primary frequency regulation requirement and the real-time value of the active power of the wind turbine group if the current time is between time T1 and time T2, and to control the flywheel energy storage system and the wind turbine group according to the frequency regulation analysis results. The re-investment analysis module is used to perform re-investment analysis on the frequency regulation parameters, the primary frequency regulation demand target value, and the real-time value of the active power of the wind turbine group if the current time is between time T2 and time T3, and to control the flywheel energy storage system and the wind turbine group according to the re-investment analysis results; The frequency regulation calculation module is used to perform frequency regulation calculations on the primary frequency regulation demand target value and the real-time value of the active power of the wind turbine group if the current time is greater than T3 time, and to control the flywheel energy storage system and the wind turbine group according to the frequency regulation calculation results.

[0065] Optionally, another embodiment of the present invention provides a frequency regulation control system for a flywheel energy storage system, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the frequency regulation control method for the flywheel energy storage system as described above. This system can be a computer or similar system.

[0066] Optionally, another embodiment of the present invention provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the flywheel energy storage system frequency regulation control method as described above.

[0067] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0068] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working process of the above-described apparatus and unit can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0069] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, 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.

[0070] 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 the embodiments of the present invention, depending on actual needs.

[0071] 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.

[0072] 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 of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A frequency regulation control method for a flywheel energy storage system, characterized in that, Includes the following steps: Obtain the current time and import the target value for frequency regulation; If the current time is between time 0 and time T1, the target value of the primary frequency regulation demand is adjusted to obtain the control command value of the first flywheel energy storage system, and the flywheel energy storage system is controlled according to the control command value of the first flywheel energy storage system. Import the real-time active power value and frequency regulation parameters of the wind turbine group. If the current time is between time T1 and time T2, perform frequency regulation analysis on the target value of primary frequency regulation requirement and the real-time active power value of the wind turbine group, and control the flywheel energy storage system and the wind turbine group according to the frequency regulation analysis results. If the current time is between time T2 and time T3, then the frequency regulation parameters, the target value of the primary frequency regulation requirement, and the real-time value of the active power of the wind turbine group are re-analyzed, and the flywheel energy storage system and the wind turbine group are controlled according to the re-analysis results. If the current time is greater than T3, then frequency regulation calculations are performed on the target value of the primary frequency regulation demand and the real-time value of the active power of the wind turbine group, and the flywheel energy storage system and the wind turbine group are controlled according to the frequency regulation calculation results.

2. The frequency regulation control method for a flywheel energy storage system according to claim 1, characterized in that, The process of performing frequency modulation processing on the primary frequency modulation demand target value to obtain the control command value of the first flywheel energy storage system includes: The control command value of the first flywheel energy storage system is obtained by calculating the primary frequency regulation demand target value using the first formula, wherein the first formula is: ， in, This is the control command value for the first flywheel energy storage system. This is the target value for primary frequency regulation requirements.

3. The frequency regulation control method for a flywheel energy storage system according to claim 1, characterized in that, The process of performing frequency regulation analysis on the primary frequency regulation demand target value and the real-time active power value of the wind turbine group, and controlling the flywheel energy storage system and wind turbine group based on the frequency regulation analysis results includes: Frequency regulation calculations are performed on the primary frequency regulation demand target value and the real-time active power value of the wind turbine group to obtain the first wind turbine group control target command value and the second flywheel energy storage system control command value; The flywheel energy storage system is controlled according to the control command value of the second flywheel energy storage system, and the wind turbine group is controlled according to the control target command value of the first wind turbine group; The frequency regulation parameters, the target value of the primary frequency regulation requirement, and the control command value of the second flywheel energy storage system are analyzed to obtain a frequency regulation stop command, and the flywheel energy storage system is controlled according to the frequency regulation stop command.

4. The frequency regulation control method for a flywheel energy storage system according to claim 3, characterized in that, The process of performing frequency regulation calculations on the primary frequency regulation demand target value and the real-time active power value of the wind turbine group to obtain the first wind turbine group control target command value and the second flywheel energy storage system control command value includes: The first set of equations is used to calculate the target value of the primary frequency regulation demand and the real-time value of the active power of the wind turbine group to obtain the control target command value of the first wind turbine group and the control command value of the second flywheel energy storage system. The first set of equations is as follows: ， in, This is the target control command value for the first wind turbine group. The target value for primary frequency regulation demand. This is the control command value for the second flywheel energy storage system. This represents the real-time active power of the wind turbine group.

5. The frequency regulation control method for a flywheel energy storage system according to claim 3, characterized in that, The frequency regulation parameters include the initial reference power, disturbance boundary coefficient, maximum amplitude limit of primary frequency regulation, rated power of the entire wind farm, lower limit of integral power qualification rate, and flywheel exit dead zone coefficient. The process of performing frequency regulation stop analysis on the frequency regulation parameters, the primary frequency regulation demand target value, and the control command value of the second flywheel energy storage system to obtain the frequency regulation stop command includes: If the initial reference power, the disturbance boundary coefficient, the maximum amplitude limit of the primary frequency regulation, the rated power of the entire wind farm, the lower limit of the integral energy qualification rate, the flywheel exit dead zone coefficient, the primary frequency regulation demand target value, and the control command value of the second flywheel energy storage system meet the frequency regulation stop conditions, then a frequency regulation stop command is generated. The frequency regulation stop conditions are: ， in, This is the frequency modulation requirement deviation. It is an absolute value function. The target value for primary frequency regulation demand. As the initial reference power, This is the disturbance boundary coefficient. This is the maximum amplitude limit for a single frequency modulation adjustment. This refers to the rated power of the entire wind farm. This is the control command value for the second flywheel energy storage system. This is the lower limit for the qualified rate of the points-based electricity consumption. This is the flywheel exit dead zone coefficient.

6. The frequency regulation control method for a flywheel energy storage system according to claim 4, characterized in that, The frequency regulation parameters include integral power qualification rate, maximum effective output of flywheel, lower limit of integral power qualification rate, upper limit of integral power qualification rate, actual adjustment of fan and theoretical adjustment of fan. The process of performing a re-implementation analysis on the frequency regulation parameters, the primary frequency regulation demand target value, and the real-time active power value of the wind turbine group, and controlling the flywheel energy storage system and the wind turbine group based on the re-implementation analysis results, includes: S41: Determine whether the integral power qualification rate meets the operating conditions. If it does, proceed to S42; otherwise, proceed to S43. The operating conditions are: ， in, For the pass rate of points-based electricity consumption, It is an absolute value function; S42: The third flywheel energy storage system control command value is obtained by calculating the primary frequency regulation demand target value, the maximum effective output of the flywheel, and the real-time active power value of the wind turbine group using the second formula. The flywheel energy storage system is then controlled according to the third flywheel energy storage system control command value. The second formula is: ， in, This is the control command value for the third flywheel energy storage system. For symbolic functions, The target value for primary frequency regulation demand. This represents the real-time active power of the wind turbine cluster. To achieve the maximum effective output of the flywheel; S43: Construct an interval of the integral power qualification rate with the lower limit of the integral power qualification rate as the minimum value and the upper limit of the integral power qualification rate as the maximum value; S44: Determine whether the ratio of the actual adjustment amount of the fan to the theoretical adjustment amount of the fan is within the range of the integral power qualification rate within the preset fan output qualification time. If yes, execute S45; if no, execute S46. S45: Generate a frequency modulation exit command and control the flywheel energy storage system according to the frequency modulation exit command; S46: Calculate the target value of the primary frequency regulation demand and the real-time value of the active power of the wind turbine group using the first set of equations to obtain the target command value of the second wind turbine group control and the control command value of the fourth flywheel energy storage system. Control the flywheel energy storage system according to the control command value of the fourth flywheel energy storage system and control the wind turbine group according to the target command value of the second wind turbine group control.

7. The frequency regulation control method for a flywheel energy storage system according to claim 4, characterized in that, The process of performing frequency regulation calculations on the primary frequency regulation demand target value and the real-time active power value of the wind turbine group, and controlling the flywheel energy storage system and the wind turbine group based on the frequency regulation calculation results includes: The first set of equations is used to calculate the target value of the primary frequency regulation demand and the real-time value of the active power of the wind turbine group to obtain the control target command value of the third wind turbine group and the control command value of the fifth flywheel energy storage system. The flywheel energy storage system is controlled according to the control command value of the fifth flywheel energy storage system, and the wind turbine group is controlled according to the control target command value of the third wind turbine group.

8. A frequency regulation control device for a flywheel energy storage system, characterized in that, include: The import module is used to obtain the current time and import the target value for frequency regulation. The adjustment processing module is used to adjust the target value of the primary frequency regulation demand if the current time is between time 0 and time T1, to obtain the control command value of the first flywheel energy storage system, and to control the flywheel energy storage system according to the control command value of the first flywheel energy storage system. The import module is also used to import the real-time active power value and frequency regulation parameters of the wind turbine group; The frequency regulation analysis module is used to perform frequency regulation analysis on the target value of the primary frequency regulation requirement and the real-time value of the active power of the wind turbine group if the current time is between time T1 and time T2, and to control the flywheel energy storage system and the wind turbine group according to the frequency regulation analysis results. The re-investment analysis module is used to perform re-investment analysis on the frequency regulation parameters, the primary frequency regulation demand target value, and the real-time value of the active power of the wind turbine group if the current time is between time T2 and time T3, and to control the flywheel energy storage system and the wind turbine group according to the re-investment analysis results; The frequency regulation calculation module is used to perform frequency regulation calculations on the primary frequency regulation demand target value and the real-time value of the active power of the wind turbine group if the current time is greater than T3 time, and to control the flywheel energy storage system and the wind turbine group according to the frequency regulation calculation results.

9. A frequency regulation control device for a flywheel energy storage system, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the frequency regulation control method for the flywheel energy storage system as described in any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the frequency regulation control method for the flywheel energy storage system as described in any one of claims 1 to 7.

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