Energy storage frequency modulation capacity configuration method and device, electronic equipment and storage medium

Abstract

The application discloses an energy storage frequency modulation capacity configuration method and device, electronic equipment and a storage medium, and is used for solving the problem that in the prior art, energy storage capacity cannot be fully utilized to participate in frequency modulation when system frequency modulation is performed, and thus remaining energy storage frequency modulation capacity exists. The method comprises the following steps: when frequency disturbance of a system is detected, rotor kinetic energy range released by synchronous machine participation in inertia response is calculated; based on a wind storage joint frequency modulation strategy, frequency modulation power configuration relationship between energy storage frequency modulation capacity and wind farm frequency modulation capacity in a wind storage joint system is determined according to the rotor kinetic energy range; and the configuration range of the energy storage frequency modulation capacity is determined according to the frequency modulation power configuration relationship and considering wind speed differences of the wind turbine. Thus, in the system frequency modulation process, the energy storage capacity can be fully utilized to participate in frequency modulation, and the upper limit of the configured energy storage frequency modulation capacity is reduced.

Description

Technical Field

[0001] This invention relates to the field of new energy power generation technology, and in particular to a method, apparatus, electronic device and storage medium for configuring energy storage frequency regulation capacity. Background Technology

[0002] In the field of renewable energy power generation, the large-scale integration of renewable energy sources has led to significant fluctuations in grid connection, placing immense pressure on the system's active power reserve and frequency regulation. In practical applications, wind turbine participation in frequency regulation can improve the system's frequency variation rate and frequency low points. However, in the field of wind-storage combined frequency regulation, existing research mostly employs methods such as virtual inertia and fuzzy control to improve the frequency regulation control of wind turbines or energy storage, aiming to leverage the frequency regulation performance of different resources or optimize the economic cost of frequency regulation in wind-storage combined systems. However, this approach to frequency regulation cannot fully utilize energy storage capacity, potentially leading to surplus energy storage capacity for frequency regulation. Summary of the Invention

[0003] This invention provides a method, apparatus, electronic device, and storage medium for configuring energy storage frequency regulation capacity, which solves or partially solves the problem in existing related technologies where energy storage capacity cannot be fully utilized for frequency regulation during system frequency regulation, resulting in surplus energy storage frequency regulation capacity.

[0004] This invention provides a method for configuring energy storage frequency regulation capacity, the method comprising:

[0005] When a frequency disturbance is detected in the system, calculate the range of rotor kinetic energy released by the synchronous machine in the inertial response.

[0006] Based on the wind-storage joint frequency regulation strategy, the frequency regulation power configuration relationship between the energy storage frequency regulation capacity and the wind farm frequency regulation capacity in the wind-storage joint system is determined according to the rotor kinetic energy range.

[0007] Based on the frequency regulation power configuration relationship and considering the wind speed difference of the fan, the configuration range of the energy storage frequency regulation capacity is determined.

[0008] Optionally, the range of rotor kinetic energy in which the computational synchronizer participates in the inertial response release includes:

[0009] Determine the rated rotor kinetic energy of the synchronous machine during rated operation based on the synchronous machine rotor motion equation;

[0010] Based on the rated rotor kinetic energy and the rotational speed range of the synchronous machine, the maximum rotor kinetic energy of the synchronous machine during frequency modulation is determined. The maximum rotor kinetic energy is used to represent the range of rotor kinetic energy in which the synchronous machine participates in the release of inertial response.

[0011] Optionally, the wind-storage combined frequency regulation strategy involves both the wind turbine and the energy storage in the wind-storage combined system using constant power discharge, wherein the energy storage participates in frequency regulation at full power.

[0012] Optionally, determining the frequency regulation power configuration relationship between the energy storage frequency regulation capacity and the wind farm frequency regulation capacity in the wind-storage integrated system based on the rotor kinetic energy range includes:

[0013] During the frequency modulation phase, based on the square wave inertia control of the wind turbine and the full-power frequency modulation form of the energy storage, the energy frequency modulation equation is written according to the rotor kinetic energy range.

[0014] The discharge time of the wind-storage combined system is set to be the same as the inertial time constant of the synchronous machine, and based on the energy frequency regulation equation, the frequency regulation power configuration relationship between the energy storage frequency regulation capacity and the wind farm frequency regulation capacity in the wind-storage combined system is derived.

[0015] Optionally, the expression for the energy frequency modulation equation is:

[0016] (dP1+P ESS )Δt=0.0392P N T J

[0017] The expression for the frequency modulation power configuration relationship is:

[0018]

[0019] Where dP1 represents the square wave inertia control power, P ESS P represents the energy storage frequency regulation capacity, Δt represents the discharge time of the wind-storage combined system, and P represents the energy storage frequency regulation capacity. N This indicates the rated capacity of the synchronous machine, T. J P represents the inertial time constant of the synchronous machine. win This indicates the frequency regulation capacity of the wind farm.

[0020] Optionally, determining the configuration range of the energy storage frequency regulation capacity based on the frequency regulation power configuration relationship and considering the wind speed difference of the wind turbine includes:

[0021] When the wind farm cannot participate in frequency regulation due to the wind speed of the wind turbine being lower than the preset lower threshold, the upper limit of the energy storage frequency regulation capacity is calculated through the frequency regulation power configuration relationship.

[0022] When the wind turbine wind speed is greater than or equal to the preset upper limit threshold, and frequency regulation is only carried out by the wind farm, the lower limit of the energy storage frequency regulation capacity is calculated based on the frequency regulation power configuration relationship.

[0023] The configuration range of the energy storage frequency regulation capacity is determined based on the lower limit of the energy storage frequency regulation capacity and the upper limit of the energy storage frequency regulation capacity.

[0024] Optionally, the configuration range of the energy storage frequency regulation capacity is 0 to 0.0408P. win Based on safety margin considerations, the upper limit of the energy storage frequency regulation capacity is taken as 5% of the wind farm's frequency regulation capacity, i.e., 0.5P. win .

[0025] The present invention also provides an energy storage frequency regulation capacity configuration device, comprising:

[0026] The rotor kinetic energy range calculation module is used to calculate the range of rotor kinetic energy released by the synchronous machine in the inertial response when a frequency disturbance is detected in the system.

[0027] The frequency regulation power configuration relationship determination module is used to determine the frequency regulation power configuration relationship between the energy storage frequency regulation capacity and the wind farm frequency regulation capacity in the wind-storage joint system based on the wind-storage joint frequency regulation strategy and according to the rotor kinetic energy range.

[0028] The energy storage frequency regulation capacity configuration module is used to determine the configuration range of the energy storage frequency regulation capacity based on the frequency regulation power configuration relationship and taking into account the wind speed difference of the wind turbine.

[0029] The present invention also provides an electronic device, the device comprising a processor and a memory:

[0030] The memory is used to store program code and transmit the program code to the processor;

[0031] The processor is used to execute the energy storage frequency regulation capacity configuration method as described above, according to the instructions in the program code.

[0032] The present invention also provides a computer-readable storage medium for storing program code for executing the energy storage frequency regulation capacity configuration method as described in any of the preceding claims.

[0033] As can be seen from the above technical solutions, the present invention has the following advantages:

[0034] A method for configuring energy storage frequency regulation capacity considering wind turbine frequency regulation capacity is provided. When a frequency disturbance is detected in the system, the range of rotor kinetic energy released by the synchronous machine in the inertial response is first calculated to analyze the inertial response energy released by the synchronous machine. Then, based on the wind-storage joint frequency regulation strategy, the frequency regulation power configuration relationship between the energy storage frequency regulation capacity and the wind farm frequency regulation capacity in the wind-storage joint system is determined according to the rotor kinetic energy range. Finally, based on the frequency regulation power configuration relationship and considering the wind speed difference of the wind turbine, the configuration range of the energy storage frequency regulation capacity is determined. Thus, during the system frequency regulation process, the energy storage capacity can be fully utilized to participate in frequency regulation, reducing the upper limit of the configured energy storage frequency regulation capacity. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A flowchart illustrating the steps of an energy storage frequency regulation capacity configuration method provided in an embodiment of the present invention;

[0037] Figure 2 A schematic diagram of wind turbine square wave inertia control and full power generation of energy storage provided in an embodiment of the present invention;

[0038] Figure 3 A schematic diagram of a four-unit, two-area wind-storage integrated system provided in an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of the frequency response curve of a system after a frequency disturbance, provided in an embodiment of the present invention.

[0040] Figure 5 A schematic diagram of the active power output curve of a wind turbine participating in frequency regulation is provided in an embodiment of the present invention;

[0041] Figure 6 This is a structural block diagram of an energy storage frequency regulation capacity configuration device provided in an embodiment of the present invention. Detailed Implementation

[0042] This invention provides a method, apparatus, electronic device, and storage medium for configuring energy storage frequency regulation capacity, which solves or partially solves the problem in existing related technologies where energy storage capacity cannot be fully utilized for frequency regulation during system frequency regulation, resulting in surplus energy storage frequency regulation capacity.

[0043] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0044] As an example, in the field of wind-storage joint frequency regulation, existing research mostly employs methods such as virtual inertia and fuzzy control to improve the frequency regulation control of wind turbines or energy storage, aiming to leverage the frequency regulation performance of different resources or optimize the economic cost of frequency regulation in wind-storage joint systems. Further analysis reveals that existing technologies primarily target the active power control capabilities of wind turbines or energy storage, i.e., improving the control of both energy storage and wind turbines to fully utilize the frequency regulation potential of different resources and maximize system frequency improvement. However, there is little research on clarifying the relationship between wind turbine frequency regulation capacity and energy storage frequency regulation capacity, considering wind speed differences, and determining the upper limit of energy storage capacity—that is, how to fully utilize energy storage capacity for frequency regulation—while ensuring the system's inertial response capability remains unchanged. In summary, using existing methods for frequency regulation cannot fully utilize energy storage capacity, potentially leading to a surplus of energy storage frequency regulation capacity.

[0045] Therefore, one of the core inventive points of this invention is: to solve the above problems, a method for configuring energy storage frequency regulation capacity considering wind turbine frequency regulation capacity is proposed. When a frequency disturbance is detected in the system, the range of rotor kinetic energy released by the synchronous machine in the inertial response is calculated to analyze the inertial response energy released by the synchronous machine; based on the wind-storage joint frequency regulation strategy, the frequency regulation power configuration relationship between the energy storage frequency regulation capacity and the wind farm frequency regulation capacity in the wind-storage joint system is determined according to the rotor kinetic energy range; then, based on the frequency regulation power configuration relationship, considering the wind turbine wind speed difference, the configuration range of the energy storage frequency regulation capacity is determined. Thus, during the system frequency regulation process, to ensure that the inertial response capability of the wind-storage joint system remains unchanged after replacing the synchronous machine, based on the square wave inertial control of the wind turbine and the full power generation form of the joint energy storage, the energy storage capacity can be fully utilized to participate in frequency regulation, reducing the upper limit of the configured energy storage frequency regulation capacity, and providing a basis for studying how to fully coordinate wind and storage resources, allocate energy storage frequency regulation capacity, and comprehensively improve the system frequency characteristics.

[0046] Reference Figure 1 The diagram illustrates a flowchart of a method for configuring energy storage frequency regulation capacity according to an embodiment of the present invention, which may specifically include the following steps:

[0047] Step 101: When a frequency disturbance is detected in the system, calculate the range of rotor kinetic energy released by the synchronous machine in the inertial response.

[0048] First, in a power system, when a frequency disturbance is detected (or a frequency disturbance can be set based on test requirements), the range of rotor kinetic energy released by the synchronous machine in the inertial response under the frequency disturbance can be analyzed by combining the synchronous machine rotor motion equation.

[0049] In a specific implementation, calculating the range of rotor kinetic energy released by the synchronous machine in the inertial response can include the following sub-steps:

[0050] Step S01: Determine the rated rotor kinetic energy of the synchronous machine during rated operation based on the synchronous machine rotor motion equation;

[0051] When the synchronous machine is running at its rated speed, its stored rotor kinetic energy E can be determined according to the synchronous machine rotor motion equation. K for:

[0052]

[0053] Jω S 2 =P N T J

[0054] In the formula, J is the moment of inertia of all rotating masses attached to the rotor shaft, and ω S T is the rotor speed of the synchronous machine. J P is the inertial time constant of the synchronous machine. N This refers to the rated capacity of the synchronizing machine.

[0055] Step S02: Based on the rated rotor kinetic energy and combined with the speed variation range of the synchronous machine, determine the maximum rotor kinetic energy of the synchronous machine during the frequency modulation process. The maximum rotor kinetic energy is used to represent the range of rotor kinetic energy in which the synchronous machine participates in the release of inertial response.

[0056] The frequency shift in a system originates from the power imbalance between total active power output and load consumption. After a frequency disturbance, during frequency regulation, the rotational speed of the synchronous machine (synchronous generator) typically varies within the range of 0.96–1 p.u. This corresponds to the maximum rotor kinetic energy ΔE that the synchronous machine can release. kmax (Inertial response energy) is:

[0057]

[0058] Based on the maximum rotor kinetic energy equation, the range of rotor kinetic energy in which the synchronous machine participates in the inertial response release can be calculated to be 0–0.0392 P. N T J .

[0059] Step 102: Based on the wind-storage joint frequency regulation strategy, determine the frequency regulation power configuration relationship between the energy storage frequency regulation capacity and the wind farm frequency regulation capacity in the wind-storage joint system according to the rotor kinetic energy range;

[0060] Once the range of rotor kinetic energy released by the synchronous machine in the inertial response is determined, the relationship between the frequency regulation capacity of energy storage and the frequency regulation capacity of wind farm in the wind-storage integrated system can be analyzed based on the square wave inertial control of the wind turbine and the full-load frequency regulation power form of energy storage.

[0061] In actual frequency regulation, considering that the frequency regulation capacity of wind turbines is easily affected by wind speed, there may be situations where wind turbines cannot participate in frequency regulation due to excessively low wind speeds. In such cases, energy storage is needed in conjunction with synchronous generators to undertake the frequency regulation task and compensate for some of the unbalanced power.

[0062] From the maximum rotor kinetic energy equation, it can be seen that when the wind-storage combined system replaces the synchronous machine with an equal capacity, i.e., P N =P win +P ESS , where P win For the frequency regulation capacity of the wind farm, P ESS For energy storage frequency regulation capacity, P N For a constant value, the wind-storage unit can release the same amount of energy as the maximum rotor kinetic energy equation by adding virtual inertial control, which is similar to the inertial response of a synchronous machine. However, using virtual inertial control may result in insufficient utilization of energy storage capacity, meaning that the energy storage device emits relatively small frequency regulation power during frequency regulation, and a significant amount of frequency regulation capacity remains unused.

[0063] Based on this, the present invention provides a method for configuring energy storage frequency regulation capacity based on the frequency regulation capacity of wind farms.

[0064] The wind turbine's square wave inertia control and the full-power frequency regulation of energy storage proposed in this invention, namely the wind-storage joint frequency regulation strategy, specifically means that both the wind turbine and the energy storage in the wind-storage joint system adopt constant power discharge, and the energy storage participates in frequency regulation in the form of full-power generation.

[0065] Both wind and energy storage employ constant power discharge, which fully utilizes frequency regulation capacity to participate in frequency adjustment and improve system frequency. For energy storage, compared with virtual inertial control, utilizing full-power energy storage allows for full utilization of energy storage capacity while maintaining the system's inertial response capability, thereby reducing the upper limit of the configured energy storage capacity.

[0066] In practical implementation, the process of determining the frequency regulation power configuration relationship between the energy storage frequency regulation capacity and the wind farm frequency regulation capacity in the wind-storage integrated system, based on the rotor kinetic energy range, may include the following sub-steps:

[0067] Step S11: During the frequency regulation phase, based on the square wave inertia control of the wind turbine and the full-power frequency regulation form of the energy storage, write the energy frequency regulation equation according to the rotor kinetic energy range.

[0068] Within the discharge time Δt of the wind-storage combined system, if the wind-storage combined system using the frequency modulation strategy provided in this embodiment of the invention can provide the same energy as the maximum rotor kinetic energy equation, then the expression for the energy frequency modulation equation can be determined as follows:

[0069] (dP1+P ESS )Δt=0.0392P N TJ

[0070] In the formula, dP1 represents the square wave inertia control power.

[0071] Step S12: Set the discharge time of the wind-storage combined system to be the same as the inertial time constant of the synchronous machine, and derive the frequency regulation power configuration relationship between the energy storage frequency regulation capacity and the wind farm frequency regulation capacity in the wind-storage combined system based on the energy frequency regulation equation.

[0072] According to the energy frequency regulation equation, during the frequency regulation phase, the energy storage frequency regulation capacity can be determined based on the wind farm's frequency regulation capacity.

[0073] The discharge time of the wind-storage combined system should be consistent with the magnitude of the inertia time constant of the synchronous machine, i.e., Δt = T. J The expression for the frequency regulation power configuration relationship between energy storage frequency regulation capacity and wind farm frequency regulation capacity can be listed as follows:

[0074]

[0075] As can be seen from the frequency regulation power configuration relationship, if the frequency regulation power provided by the fan is greater than 0.0392P... win Then, no energy storage is needed to provide frequency support, and the same inertial response energy as the maximum rotor kinetic energy equation can be released. Conversely, if the wind turbine cannot provide 0.0392P... win The frequency regulation power of the wind turbine will change, and the frequency regulation capacity of the energy storage will also change accordingly.

[0076] For better explanation, refer to Figure 2 The diagram illustrates a wind turbine square wave inertia control and full-power energy storage system provided for an embodiment of the present invention.

[0077] Typically, wind turbines operate in MPPT (Maximum Power Point Tracking) mode, i.e., point A.

[0078] Among them, MPPT mode refers to adjusting the output power of the photovoltaic array according to different environmental factors and other characteristic values, so that the output power of the photovoltaic array is always kept at the maximum.

[0079] When a frequency disturbance occurs, the fan increases its output power. At this point, the fan output power reaches point B and remains at this level for a period of time until point C. During the process from B to C (i.e., the fan participates in frequency regulation), the fan continuously decelerates. To avoid excessive deceleration, the fan power begins to drop sharply and exits, i.e., from point C to point D. Afterwards, it recovers along the curve from D to E to A (i.e., the fan speed recovery phase).

[0080] During the change of the wind turbine from A to B, considering that the square wave inertia control power dP1 of the wind turbine is greatly affected by the wind speed, the energy storage frequency regulation capacity P... ESS It will also act accordingly. The output change of the energy storage frequency regulation capacity participating in the primary frequency regulation stage can be referred to the frequency regulation power configuration relationship expression in the aforementioned steps.

[0081] Step 103: Based on the frequency regulation power configuration relationship and considering the wind speed difference of the fan, determine the configuration range of the energy storage frequency regulation capacity.

[0082] Finally, based on the relationship between the energy storage frequency regulation capacity and the wind farm frequency regulation capacity determined in step 102, and considering the wind speed difference of the wind turbine, the configuration range of the energy storage frequency regulation capacity can be analyzed.

[0083] Furthermore, the process of determining the configuration range of energy storage frequency regulation capacity based on the frequency regulation power configuration relationship and considering the wind speed differences of the wind turbines can specifically include the following sub-steps:

[0084] Step S21: When the wind farm cannot participate in frequency regulation due to the wind speed of the wind turbine being less than the preset lower threshold, calculate the upper limit of the energy storage frequency regulation capacity through the frequency regulation power configuration relationship.

[0085] When the wind speed at the wind farm is too low (e.g., below a pre-set lower threshold) to participate in frequency regulation, dP1 = 0, and the upper limit of the energy storage frequency regulation capacity for participating in the energy storage frequency regulation phase can be obtained as follows:

[0086] P ESS =0.0408P win

[0087] Based on the foregoing, the frequency regulation of the entire system can be flexibly divided into four scenarios based on actual conditions: the first is that only the synchronous machine participates in frequency regulation; the second is that the synchronous machine and the wind turbine participate in frequency regulation; the third is that the synchronous machine and the energy storage participate in frequency regulation; and the fourth is that the synchronous machine, the wind turbine, and the energy storage all participate in frequency regulation simultaneously. Among these, dP1=0 is one of the most extreme cases in the frequency regulation process of the wind-storage combined system. Only under this condition can the maximum frequency regulation capacity of the configured energy storage be achieved.

[0088] In fact, based on the frequency regulation power configuration equation, it can be seen that if the wind turbine cannot provide 0.0392P... win The frequency regulation power provided by the wind turbine varies, and the frequency regulation capacity of the energy storage will also change accordingly. Furthermore, due to the significant uncertainty in wind speed, dP1 = 0 is a real possibility. Therefore, setting dP1 = 0 is to determine the maximum threshold for the energy storage frequency regulation capacity.

[0089] Step S22: When the wind turbine wind speed is greater than or equal to the preset upper limit threshold, and frequency regulation is only carried out through the wind farm, the lower limit of the energy storage frequency regulation capacity is calculated through the frequency regulation power configuration relationship.

[0090] When frequency regulation is only conducted through wind farms, the lower limit of energy storage frequency regulation capacity can be calculated to be 0 based on the frequency regulation power configuration relationship.

[0091] Step S23: Determine the configuration range of energy storage frequency regulation capacity based on the lower limit and upper limit of energy storage frequency regulation capacity.

[0092] In summary, when the wind turbine has frequency regulation capability, the configuration range of energy storage frequency regulation capacity is 0 to 0.0408P. win Based on safety margin considerations, the upper limit of the energy storage frequency regulation capacity can be set at 5% of the wind farm's frequency regulation capacity, i.e., 0.5P. win .

[0093] In this embodiment of the invention, a method for configuring energy storage frequency regulation capacity considering wind turbine frequency regulation capacity is proposed. When a frequency disturbance is detected in the system, the range of rotor kinetic energy released by the synchronous machine in the inertial response is calculated to analyze the inertial response energy released by the synchronous machine. Based on the wind-storage joint frequency regulation strategy, the frequency regulation power configuration relationship between the energy storage frequency regulation capacity and the wind farm frequency regulation capacity in the wind-storage joint system is determined according to the rotor kinetic energy range. Then, based on the frequency regulation power configuration relationship and considering the wind turbine wind speed difference, the configuration range of energy storage frequency regulation capacity is determined. Thus, during the system frequency regulation process, to ensure that the inertial response capability of the wind-storage joint system remains unchanged after replacing the synchronous machine, based on the square wave inertial control of the wind turbine and the full power generation form of the joint energy storage, the energy storage capacity can be fully utilized to participate in frequency regulation, reducing the upper limit of the configured energy storage frequency regulation capacity. This provides a foundation for studying how to fully coordinate wind and storage resources, allocate energy storage frequency regulation capacity, and comprehensively improve the system frequency characteristics.

[0094] For ease of understanding, the following description uses a specific example to illustrate an embodiment of the present invention.

[0095] To verify the effectiveness and correctness of the method proposed in this embodiment of the invention, a two-region system was built using DIgSILENT (Digital Simulation and Electrical Network, a comprehensive power system simulation software) in this example. (Refer to...) Figure 3 The diagram shows a wiring diagram of a four-unit, two-area integrated wind and storage system provided by an embodiment of the present invention.

[0096] G1, G3, and G4 are synchronous turbines, each with a capacity of 900 MW (megawatt). The wind-storage integrated system includes a wind farm (…). Figure 3The term "W" represents the generator output, and the system includes a battery energy storage system (BESS). The wind farm consists of 300 2MW DFIG (Doubly Fed Induction Generator) wind turbines, with a total installed capacity of 600MW. Based on the configuration range equation for energy storage frequency regulation capacity, the battery energy storage system has a frequency regulation capacity of 30MW, accounting for 5% of the wind farm's capacity.

[0097] The system is set to experience a load surge of 200MW at 10 seconds, with the frequency regulation power dP1 provided by the wind turbines exceeding 0.0392P. win dP1 is 0.1P win Combining Figure 2 During the frequency modulation phase, without the need for energy storage to provide frequency support, it can release inertial response energy greater than that of the maximum rotor kinetic energy equation.

[0098] Set Case 1: Only synchronous motor frequency regulation is used, and the fan operates in MPPT state.

[0099] Case 2: The fan and synchronous motor participate in frequency regulation, and the frequency regulation power dP1 provided by the fan is 0.1P. win Based on the frequency regulation power configuration equation, it can be seen that energy storage does not need to participate in frequency regulation. After the frequency regulation ends, the wind turbine directly exits the frequency regulation process.

[0100] Reference Figure 4 The diagram shows a schematic of the frequency response curve of a system after a frequency disturbance, as provided in an embodiment of the present invention.

[0101] Depend on Figure 4 It can be seen that, compared to only synchronous machines participating in frequency regulation, wind turbines participating in frequency regulation can better improve the system frequency. Furthermore, the frequency regulation power dP1 provided by the wind turbine is 0.1P. win This is far greater than the energy released by the synchronous machine, which is 0.0392P. N T J Therefore, the low-frequency improvement characteristics in Case 2 are better than those in Case 1.

[0102] Reference Figure 5 The diagram shows a schematic of the active power output curve of a wind turbine participating in frequency regulation according to an embodiment of the present invention.

[0103] Depend on Figure 5 It can be seen that the frequency regulation power provided by the wind turbine is greater than 0.0392P. win Based on the frequency regulation power configuration equation, it can be seen that no energy storage is needed to provide frequency support, yet the same inertial response energy as the maximum rotor kinetic energy equation can be released. Furthermore, the frequency regulation power dP1 provided by the wind turbine is 0.1P. winAt this point, the frequency regulation capacity provided by the wind turbine is greater than the inertial response energy of the synchronous machine. Therefore, Figure 5 The frequency low point of Case 2 is significantly higher than that of Case 1.

[0104] Reference Figure 6 The diagram illustrates a structural block diagram of an energy storage frequency regulation capacity configuration device according to an embodiment of the present invention, which may specifically include:

[0105] The rotor kinetic energy range calculation module 601 is used to calculate the range of rotor kinetic energy in which the synchronous machine participates in the inertial response release when a frequency disturbance is detected in the system.

[0106] The frequency regulation power configuration relationship determination module 602 is used to determine the frequency regulation power configuration relationship between the energy storage frequency regulation capacity and the wind farm frequency regulation capacity in the wind-storage joint system based on the wind-storage joint frequency regulation strategy and according to the rotor kinetic energy range.

[0107] The energy storage frequency regulation capacity configuration module 603 is used to determine the configuration range of the energy storage frequency regulation capacity based on the frequency regulation power configuration relationship and taking into account the wind speed difference of the wind turbine.

[0108] In one optional embodiment, the rotor kinetic energy range calculation module 601 includes:

[0109] The rated rotor kinetic energy determination module is used to determine the rated rotor kinetic energy of the synchronous machine during rated operation based on the synchronous machine rotor motion equation;

[0110] The maximum rotor kinetic energy determination module is used to determine the maximum rotor kinetic energy of the synchronous machine during frequency modulation based on the rated rotor kinetic energy and the range of rotational speed of the synchronous machine. The maximum rotor kinetic energy is used to represent the range of rotor kinetic energy of the synchronous machine participating in the release of inertial response.

[0111] In one optional embodiment, the wind-storage combined frequency regulation strategy is that both the wind turbine and the energy storage in the wind-storage combined system adopt constant power discharge, wherein the energy storage participates in frequency regulation in the form of full power generation.

[0112] In one optional embodiment, the frequency modulation power configuration relationship determination module 602 includes:

[0113] The energy frequency modulation equation writing module is used to write the energy frequency modulation equation based on the square wave inertia control of the wind turbine and the full-power frequency modulation form of the energy storage, according to the rotor kinetic energy range, during the frequency modulation phase.

[0114] The frequency regulation power configuration relationship derivation module is used to set the discharge time of the wind-storage combined system and the inertial time constant of the synchronous machine to be the same, and based on the energy frequency regulation equation, derive the frequency regulation power configuration relationship between the energy storage frequency regulation capacity and the wind farm frequency regulation capacity in the wind-storage combined system.

[0115] In one optional embodiment, the expression for the energy frequency modulation equation is:

[0116] (dP1+P ESS )Δt=0.0392P N T J

[0117] The expression for the frequency modulation power configuration relationship is:

[0118]

[0119] Where dP1 represents the square wave inertia control power, P ESS P represents the energy storage frequency regulation capacity, Δt represents the discharge time of the wind-storage combined system, and P represents the energy storage frequency regulation capacity. N This indicates the rated capacity of the synchronous machine, T. J P represents the inertial time constant of the synchronous machine. win This indicates the frequency regulation capacity of the wind farm.

[0120] In one optional embodiment, the energy storage frequency regulation capacity configuration module 603 includes:

[0121] The energy storage frequency regulation capacity upper limit calculation module is used to calculate the upper limit of energy storage frequency regulation capacity when the wind farm cannot participate in frequency regulation due to the wind turbine wind speed being less than the preset lower limit threshold.

[0122] The energy storage frequency regulation capacity lower limit calculation module is used to calculate the energy storage frequency regulation capacity lower limit when the wind turbine wind speed is greater than or equal to the preset upper limit threshold and frequency regulation is only carried out by the wind farm, based on the frequency regulation power configuration relationship.

[0123] The energy storage frequency regulation capacity configuration range determination module is used to determine the configuration range of the energy storage frequency regulation capacity based on the lower limit of the energy storage frequency regulation capacity and the upper limit of the energy storage frequency regulation capacity.

[0124] In one optional embodiment, the configuration range of the energy storage frequency regulation capacity is 0 to 0.0408P. win Based on safety margin considerations, the upper limit of the energy storage frequency regulation capacity is taken as 5% of the wind farm's frequency regulation capacity, i.e., 0.5P. win .

[0125] As the device embodiment is basically similar to the method embodiment, it is described in a relatively simple way. For relevant details, please refer to the description of the method embodiment above.

[0126] This invention also provides an electronic device, which includes a processor and a memory:

[0127] The memory is used to store program code and transfer the program code to the processor;

[0128] The processor is used to execute the energy storage frequency regulation capacity configuration method of any embodiment of the present invention according to the instructions in the program code.

[0129] This invention also provides a computer-readable storage medium for storing program code for executing the energy storage frequency regulation capacity configuration method of any embodiment of this invention.

[0130] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0131] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, 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. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between apparatuses or units through some interfaces, and may be electrical, mechanical, or other forms.

[0132] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0133] 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.

[0134] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes 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.

[0135] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for configuring energy storage frequency regulation capacity, characterized in that, include: When a frequency disturbance is detected in the system, calculate the range of rotor kinetic energy released by the synchronous machine in the inertial response. Based on the wind-storage joint frequency regulation strategy, the frequency regulation power configuration relationship between the energy storage frequency regulation capacity and the wind farm frequency regulation capacity in the wind-storage joint system is determined according to the rotor kinetic energy range. Based on the frequency regulation power configuration relationship and considering the wind speed difference of the fan, the configuration range of the energy storage frequency regulation capacity is determined; The wind-storage combined frequency regulation strategy involves both the wind turbine and energy storage in the combined system employing constant power discharge, with the energy storage participating in frequency regulation at full power. The determination of the frequency regulation power configuration relationship between the energy storage frequency regulation capacity and the wind farm frequency regulation capacity in the combined system, based on the rotor kinetic energy range, includes: during the frequency regulation phase, based on the square wave inertia control of the wind turbine and the full power generation of the energy storage, and according to the rotor kinetic energy range, writing an energy frequency regulation equation; setting the discharge time of the combined system to be consistent with the inertial time constant of the synchronous machine, and deriving the frequency regulation power configuration relationship between the energy storage frequency regulation capacity and the wind farm frequency regulation capacity in the combined system based on the energy frequency regulation equation.

2. The energy storage frequency regulation capacity configuration method according to claim 1, characterized in that, The range of rotor kinetic energy in which the computational synchronizing machine participates in the inertial response release includes: Determine the rated rotor kinetic energy of the synchronous machine during rated operation based on the synchronous machine rotor motion equation; Based on the rated rotor kinetic energy and the rotational speed range of the synchronous machine, the maximum rotor kinetic energy of the synchronous machine during frequency modulation is determined. The maximum rotor kinetic energy is used to represent the range of rotor kinetic energy in which the synchronous machine participates in the release of inertial response.

3. The energy storage frequency regulation capacity configuration method according to claim 1, characterized in that, The expression for the energy frequency modulation equation is: The expression for the frequency modulation power configuration relationship is: Where dP1 represents the square wave inertia control power, P ESS P represents the energy storage frequency regulation capacity, Δt represents the discharge time of the wind-storage combined system, and P represents the energy storage frequency regulation capacity. N This indicates the rated capacity of the synchronous machine, T. J P represents the inertial time constant of the synchronous machine. win This indicates the frequency regulation capacity of the wind farm.

4. The energy storage frequency regulation capacity configuration method according to claim 3, characterized in that, The step of determining the configuration range of the energy storage frequency regulation capacity based on the frequency regulation power configuration relationship and considering the wind speed difference of the wind turbine includes: When the wind farm cannot participate in frequency regulation due to the wind speed of the wind turbine being lower than the preset lower threshold, the upper limit of the energy storage frequency regulation capacity is calculated through the frequency regulation power configuration relationship. When the wind turbine wind speed is greater than or equal to the preset upper limit threshold, and frequency regulation is only carried out by the wind farm, the lower limit of the energy storage frequency regulation capacity is calculated based on the frequency regulation power configuration relationship. The configuration range of the energy storage frequency regulation capacity is determined based on the lower limit of the energy storage frequency regulation capacity and the upper limit of the energy storage frequency regulation capacity.

5. The energy storage frequency regulation capacity configuration method according to claim 4, characterized in that, The configuration range of the energy storage frequency regulation capacity is as follows: Based on safety margin considerations, the upper limit of the energy storage frequency regulation capacity is taken as 5% of the wind farm's frequency regulation capacity, i.e. .

6. An energy storage frequency regulation capacity configuration device, characterized in that, include: The rotor kinetic energy range calculation module is used to calculate the range of rotor kinetic energy released by the synchronous machine in the inertial response when a frequency disturbance is detected in the system. The frequency regulation power configuration relationship determination module is used to determine the frequency regulation power configuration relationship between the energy storage frequency regulation capacity and the wind farm frequency regulation capacity in the wind-storage joint system based on the wind-storage joint frequency regulation strategy and according to the rotor kinetic energy range. The energy storage frequency regulation capacity configuration module is used to determine the configuration range of the energy storage frequency regulation capacity based on the frequency regulation power configuration relationship and taking into account the wind speed difference of the wind turbine. The wind-storage combined frequency regulation strategy involves both the wind turbines and energy storage in the combined system employing constant power discharge, wherein the energy storage participates in frequency regulation at full power. The frequency regulation power configuration relationship determination module includes: The energy frequency modulation equation writing module is used to write the energy frequency modulation equation based on the square wave inertia control of the wind turbine and the full power form of the energy storage during the frequency modulation phase, according to the rotor kinetic energy range. The frequency regulation power configuration relationship derivation module is used to set the discharge time of the wind-storage combined system and the inertial time constant of the synchronous machine to be the same, and based on the energy frequency regulation equation, derive the frequency regulation power configuration relationship between the energy storage frequency regulation capacity and the wind farm frequency regulation capacity in the wind-storage combined system.

7. An electronic device, characterized in that, The device includes a processor and a memory: The memory is used to store program code and transmit the program code to the processor; The processor is used to execute the energy storage frequency regulation capacity configuration method according to any one of claims 1-5 according to the instructions in the program code.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium is used to store program code for executing the energy storage frequency regulation capacity configuration method according to any one of claims 1-5.

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