Frequency modulation method and device for primary frequency modulation and AGC cooperative control, and energy storage system

Abstract

The invention relates to a primary frequency modulation and AGC cooperative control frequency modulation method and device and an energy storage system, and belongs to the technical field of primary frequency modulation control, and the method comprises the steps: determining a difference value between a current grid-connected point frequency and a power grid rated frequency when a load control direction of a primary frequency modulation instruction is not consistent with a load control direction of an AGC instruction; determining an active instruction based on the line loss, a preset frequency deviation threshold value and the difference value; and adjusting the load based on the active instruction to adjust the frequency of the power grid. According to the method provided by the invention, when the load control direction of the primary frequency modulation instruction is inconsistent with the load control direction of the AGC instruction, the difference value between the current grid-connected point frequency and the power grid rated frequency is determined, and the active instruction is obtained according to the line loss, the preset frequency deviation threshold and the difference value, so that the load is adjusted according to the active instruction; through cooperative control of primary frequency modulation and AGC, rapid and stable frequency of the power grid is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of primary frequency modulation control, and in particular to a frequency modulation method, device and energy storage system for coordinated control of primary frequency modulation and AGC. Background Art

[0002] At present, in energy storage power stations, when the primary frequency regulation and automatic generation control (AGC) functions are put into use, the load instruction change direction of the AGC is often inconsistent with the load instruction change direction required by the primary frequency regulation. At this time, according to the relevant requirements of the power grid dispatching regulations (two detailed rules), the control requirements of the primary frequency regulation should be met first, the AGC instruction should be locked, and the correctness of the instruction direction should be ensured. When the signal that the load instruction change direction of the AGC is inconsistent with the load instruction change direction required by the primary frequency regulation disappears, the normal function of the AGC instruction is restored.

[0003] In order to ensure the priority of the frequency regulation function, when the load instruction change direction of the AGC is inconsistent with the load instruction change direction required by the primary frequency regulation, the AGC instruction is blocked, so that the AGC instruction (secondary frequency regulation) issued by the dispatcher cannot be executed, and the new dispatch instruction cannot be responded to during the frequency regulation process. After the frequency regulation is completed, the final instruction will no longer be restricted by the frequency regulation function and will be updated to the AGC instruction. At this time, the active power output of the entire station is P suddenly changes to ( To adjust the target value for frequency modulation, is the AGC command at the current moment), which may have a certain impact on the operation of the station, causing load fluctuations on the transmission line and thus affecting the stability of the power grid. Secondly, during the frequency modulation process, due to the fast response, it is impossible to accurately perform feedback adjustment to achieve the current grid-connected point active power (frequency modulation detection point) equal to the final active power command, and there is an impact of line loss.

[0004] In order to avoid such situations, it is necessary to make a further precise division of the coordinated working conditions of AGC instructions and frequency regulation instructions, so as to further reduce the grid fluctuations after frequency regulation recovery while ensuring the perfect execution of station frequency regulation instructions. Summary of the invention

[0005] In view of this, it is necessary to provide a frequency modulation method, device and energy storage system for coordinated control of primary frequency modulation and AGC, so as to achieve the purpose of improving the stability of the power grid when the load control direction of the primary frequency modulation instruction is inconsistent with the load control direction of the AGC instruction.

[0006] In order to achieve the above object, in a first aspect, the present invention provides a frequency modulation method for coordinated control of primary frequency modulation and AGC, comprising: When the load control direction of the primary frequency modulation instruction is inconsistent with the load control direction of the AGC instruction, the difference between the current grid connection point frequency and the rated frequency of the grid is determined; Determining an active power command based on the line loss, a preset frequency deviation threshold and the difference; The load is adjusted based on the active power command to adjust the frequency of the power grid.

[0007] In a possible implementation, the determining the active power instruction based on the line loss, the preset frequency deviation threshold and the difference includes: When the difference is lower than the preset frequency deviation threshold, the primary frequency modulation instruction, the AGC instruction and the line loss are superimposed to obtain the active power instruction.

[0008] In a possible implementation, the determining the active power instruction based on the line loss, the preset frequency deviation threshold and the difference includes: When the difference is higher than or equal to the preset frequency deviation threshold, the primary frequency modulation instruction and the line loss are superimposed to obtain the active power instruction.

[0009] In a possible implementation, the expression of the active power instruction is as follows:

[0010] in, P 总 Indicates active command. Indicates the frequency modulation target value, Indicates the AGC instruction at the current moment, Indicates the AGC instruction at the initial moment of the frequency modulation action. P 损耗 represents the line loss, Indicates the rated frequency of the power grid, Indicates the current grid connection point frequency, Indicates the frequency deviation threshold.

[0011] In a possible implementation, the method further includes: When the load control direction of the primary frequency modulation instruction is consistent with the load control direction of the AGC instruction, the primary frequency modulation instruction, the AGC instruction and the line loss are superimposed to obtain the active power instruction.

[0012] In a possible implementation, the expression of the active power instruction is as follows:

[0013] in, P 总 Indicates active command. Indicates the frequency modulation target value, Indicates the AGC instruction at the current moment, Indicates the AGC instruction at the initial moment of the frequency modulation action. P 损耗 Indicates line loss.

[0014] In a possible implementation, the preset frequency deviation threshold value has a value range of 0.05 Hz-0.2 Hz.

[0015] In a second aspect, the present invention further provides a frequency modulation device for coordinated control of primary frequency modulation and AGC, comprising: A first determination module is used to determine the difference between the current grid connection point frequency and the rated frequency of the power grid when the load control direction of the primary frequency modulation instruction is inconsistent with the load control direction of the AGC instruction; A second determination module, configured to determine an active power instruction based on the line loss, a preset frequency deviation threshold and the difference; The frequency regulation module is used to adjust the load based on the active power instruction to adjust the frequency of the power grid.

[0016] In a third aspect, the present invention further provides an energy storage system, comprising a frequency modulation device for coordinated control of primary frequency modulation and AGC as described in the above implementation method.

[0017] In a fourth aspect, the present invention further provides a generator set, comprising the energy storage system described in the above implementation manner.

[0018] The beneficial effects of the present invention are as follows: the frequency modulation method, device and energy storage system for coordinated control of primary frequency modulation and AGC provided by the present invention determine the difference between the current grid connection point frequency and the rated frequency of the power grid when the load control direction of the primary frequency modulation instruction and the load control direction of the AGC instruction are inconsistent. According to the difference, it can be judged whether the current power grid system has a frequency fluctuation in a specific small range, and further whether the AGC instruction needs to be locked. The active power instruction is obtained according to the line loss, the preset frequency deviation threshold and the difference, so that the load is adjusted according to the active power instruction to adjust the frequency of the power grid. The accuracy of frequency modulation can be improved by superimposing the line loss, and the stability and safety of the power grid frequency can be ensured by reasonably setting the frequency deviation threshold. The rapid stabilization of the power grid frequency is achieved through the coordinated control of primary frequency modulation and AGC. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments 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 work.

[0020] Figure 1 A flow chart of an embodiment of a frequency modulation method for coordinated control of primary frequency modulation and AGC provided by the present invention; Figure 2 For the present invention Figure 1 One of the flow charts of an embodiment of S102; Figure 3 For the present invention Figure 1 The second flow chart of an embodiment of S102; Figure 4 A logical schematic diagram of a frequency modulation method for coordinated control of primary frequency modulation and AGC provided by the present invention; Figure 5 A schematic structural diagram of an embodiment of a frequency modulation device for coordinated control of primary frequency modulation and AGC provided by the present invention. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0022] In the description of the embodiments of the present invention, unless otherwise specified, "multiple" means two or more than two. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" may mean: A exists alone, A and B exist at the same time, and B exists alone.

[0023] The descriptions of "first", "second", etc. involved in the embodiments of the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the technical features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0024] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0025] Before presenting the embodiments, the following terms are explained.

[0026] Primary frequency regulation: To cope with short-term rapid load fluctuations, the system autonomously supports or absorbs active power to the grid when the grid frequency exceeds the limit. The energy storage system uses its fast and accurate grid frequency detection and power control capabilities to respond to grid frequency changes faster than thermal power or new energy units, and independently undertakes primary frequency regulation capabilities, as follows:

[0027] in, To adjust the target value for frequency modulation, is the initial value of active power, is the full site capacity, is the current grid connection point frequency (unit: Hz), is the system frequency dead zone (unit: Hz), is the system rated frequency (in Hz), It is the rapid frequency response modulation rate of new energy.

[0028] AGC: A system that adjusts the active output of multiple generators in different power plants in the power system to respond to load changes. Power supplies with fast regulation rates and high regulation accuracy can help the power grid achieve AGC control goals more efficiently.

[0029] The present invention provides a frequency modulation method, device and energy storage system for coordinated control of primary frequency modulation and AGC, which are described below respectively.

[0030] Figure 1 A flow chart of an embodiment of a frequency modulation method for primary frequency modulation and AGC coordinated control provided by the present invention is shown in FIG. Figure 1 As shown, the frequency modulation method of primary frequency modulation and AGC coordinated control includes: S101. When the load control direction of the primary frequency modulation instruction is inconsistent with the load control direction of the AGC instruction, determine the difference between the current grid connection point frequency and the rated frequency of the grid.

[0031] It should be noted that: when a primary frequency modulation instruction requires an increase in load and an AGC instruction requires a decrease in load, or when a primary frequency modulation instruction requires a decrease in load and an AGC instruction requires an increase in load, the load control direction of the primary frequency modulation instruction is inconsistent with the load control direction of the AGC instruction.

[0032] When the load control direction of the primary frequency modulation instruction is inconsistent with the load control direction of the AGC instruction, the difference between the current grid connection point frequency and the rated frequency of the grid is calculated. The difference can be used to determine whether the current grid system fluctuates in a specific small frequency range.

[0033] S102: Determine an active power instruction based on the line loss, a preset frequency deviation threshold and the difference.

[0034] According to the line loss during FM P 损耗 , preset frequency deviation threshold The sum of the values ​​and the difference can determine the final active power instruction.

[0035] When the frequency modulation function is just activated, the initial line loss P 损耗 When it is 0, the subsequent frequency modulation instructions are updated according to the frequency change. P 损耗 It is the calculated value of the deviation between the target command and the actual power at the last moment during the frequency modulation period, which is superimposed on the final active power command.

[0036] By calculating the line loss during frequency modulation and superimposing it in the final active power instruction, the actual grid status can be reflected more accurately and the accuracy of frequency modulation can be improved.

[0037] In some embodiments of the present invention, the preset frequency deviation threshold value has a value range of 0.05 Hz-0.2 Hz.

[0038] The preset frequency deviation threshold value range is 0.05Hz-0.2Hz and cannot be less than the system frequency dead zone. Preferably, the preset frequency deviation threshold value is 0.1 Hz.

[0039] When the difference is lower than the preset frequency deviation threshold When the difference is higher than or equal to the preset frequency deviation threshold, the system will fluctuate in a specific small range. When , the frequency fluctuation range of the system is larger.

[0040] In some embodiments of the present invention, Figure 2 As shown, step S102 includes: S201. When the difference is lower than the preset frequency deviation threshold, superimpose the primary frequency modulation instruction, the AGC instruction and the line loss to obtain the active power instruction.

[0041] When the difference is lower than the frequency deviation threshold, the system fluctuates in a specific small frequency range, does not lock the AGC command, superimposes the AGC command on the primary frequency modulation command, and also superimposes the line loss during the frequency modulation period to obtain the final active power command.

[0042] The frequency modulation method of primary frequency modulation and AGC collaborative control provided in an embodiment of the present invention determines the active power instruction by superimposing the primary frequency modulation instruction, AGC instruction and line loss when the difference between the current grid-connected point frequency and the rated frequency of the power grid is lower than a preset frequency deviation threshold, that is, executing the AGC reverse instruction when the frequency fluctuates in a specific small range, so as to enhance the flexibility and response speed of the power grid.

[0043] In some embodiments of the present invention, Figure 3 As shown, step S102 includes: S301. When the difference is greater than or equal to the preset frequency deviation threshold, superimpose the primary frequency modulation instruction and the line loss to obtain the active power instruction.

[0044] When the difference is higher than or equal to the frequency deviation threshold, the AGC command is blocked, and the primary frequency modulation command and line loss are superimposed to obtain the final active power command.

[0045] The frequency modulation method of primary frequency modulation and AGC collaborative control provided in an embodiment of the present invention ensures the safety of the power grid by locking the AGC reverse instruction when the difference between the current grid connection point frequency and the rated frequency of the power grid is higher than or equal to a preset frequency deviation threshold, that is, when the frequency deviation is large.

[0046] In some embodiments of the present invention, the expression of the active power instruction is as follows:

[0047] in, P 总 Indicates active command. Indicates the frequency modulation target value, Indicates the AGC instruction at the current moment, Indicates the AGC instruction at the initial moment of the frequency modulation action. P 损耗 represents the line loss, Indicates the rated frequency of the power grid, Indicates the current grid connection point frequency, Indicates the frequency deviation threshold.

[0048] The frequency modulation method of primary frequency modulation and AGC collaborative control provided in the embodiment of the present invention can ensure the stability and safety of the power grid frequency by reasonably setting the frequency deviation threshold, and realizes rapid stabilization of the power grid frequency through the collaborative control of primary frequency modulation and AGC.

[0049] S103: Adjust the load based on the active power instruction to adjust the frequency of the power grid.

[0050] The load of the system is adjusted based on the calculated active power command, thereby changing the grid frequency. By taking into account the rapid response of primary frequency regulation and the economic regulation of AGC, and by reasonably setting the frequency deviation threshold, the stability and safety of the grid frequency can be ensured.

[0051] It should be understood that after the frequency modulation is completed, the final active power instruction will no longer be restricted by the frequency modulation function and will be updated to the AGC instruction to maintain grid stability.

[0052] To summarize, the frequency modulation method of primary frequency modulation and AGC collaborative control provided in the embodiment of the present invention determines the difference between the current grid connection point frequency and the rated frequency of the power grid when the load control direction of the primary frequency modulation instruction and the load control direction of the AGC instruction are inconsistent. According to the difference, it can be judged whether the current power grid system has a frequency fluctuation in a specific small range, and further whether the AGC instruction needs to be locked. The active power instruction is obtained according to the line loss, the preset frequency deviation threshold and the difference, so that the load is adjusted according to the active power instruction to adjust the frequency of the power grid. The accuracy of frequency modulation can be improved by superimposing the line loss. The stability and safety of the power grid frequency can be ensured by reasonably setting the frequency deviation threshold. Through the collaborative control of primary frequency modulation and AGC, rapid stabilization of the power grid frequency is achieved.

[0053] In some embodiments of the present invention, it further comprises: When the load control direction of the primary frequency modulation instruction is consistent with the load control direction of the AGC instruction, the primary frequency modulation instruction, the AGC instruction and the line loss are superimposed to obtain the active power instruction.

[0054] When both the primary frequency modulation instruction and the AGC instruction require an increase in load or a decrease in load, the load control direction of the primary frequency modulation instruction is consistent with the load control direction of the AGC instruction.

[0055] The active power command is obtained by superimposing the primary frequency modulation command, AGC command and line loss.

[0056] In some embodiments of the present invention, the expression of the active power instruction is as follows:

[0057] in, P 总 Indicates active command. Indicates the frequency modulation target value, Indicates the AGC instruction at the current moment, Indicates the AGC instruction at the initial moment of the frequency modulation action. P 损耗 Indicates line loss.

[0058] The frequency modulation method of primary frequency modulation and AGC collaborative control provided in an embodiment of the present invention can more accurately reflect the actual power grid state and improve the accuracy of frequency modulation by calculating the line loss during the frequency modulation period and superimposing it in the final active power instruction.

[0059] Figure 4 The logic diagram of the frequency modulation method of primary frequency modulation and AGC coordinated control provided by the present invention is as follows: Figure 4As shown, the present invention provides a power allocation strategy and system for energy storage power stations, which is based on the coordinated control of primary frequency regulation function and AGC instructions, and takes the execution of AGC reverse instructions, optimization of frequency regulation calculation instructions and smoothing of power fluctuations after the end of frequency regulation when the frequency fluctuates in a specific small range as optimization goals to ensure frequency regulation control requirements and grid stability.

[0060] The steps include: 1. Increase the frequency deviation threshold When the difference between the current frequency and the rated frequency is lower than the frequency deviation threshold, the AGC reverse command is not blocked and needs to be superimposed on the frequency modulation calculation command. When the current frequency deviation rated power is higher than the frequency deviation threshold, the AGC reverse command is blocked.

[0061] (II) Increased line loss during frequency modulation P 损耗 When the frequency modulation function is just activated, the initial line loss P 损耗 When it is 0, the subsequent frequency modulation instructions are updated according to the frequency change. P 损耗 It is the calculated value of the deviation between the target command and the actual power at the last moment during the frequency modulation period, which is superimposed on the final active power command. The target command is the value calculated at the last moment. P 总 .

[0062] Specifically: The AGC instruction and the FM instruction are in the same direction:

[0063] The AGC command is the opposite of the FM command:

[0064] FM End:

[0065] in, is the frequency deviation threshold, P 损耗 It is the calculated value of the deviation between the target command and the actual power at the last moment during the frequency modulation period.

[0066] The frequency modulation method of primary frequency modulation and AGC collaborative control provided in an embodiment of the present invention can smooth out the power fluctuation after switching to the AGC instruction at the end of the frequency modulation as much as possible, meet the function of executing the AGC reverse instruction when the frequency fluctuates in a specific small range, adapt to various complex working conditions during the frequency modulation as much as possible, and meet the requirement that the active power of the grid connection point (frequency modulation detection point) during the frequency modulation period is equal to the final active power instruction as much as possible.

[0067] In addition, the line loss can be formulated into a linear function curve based on the station's past data.P 执行 = K.P 计算 + B ( K , B Set according to the station operation status. P 计算 To consider the frequency modulation calculation instructions of the AGC instructions, P 执行 is the execution instruction after superimposed loss).

[0068] In order to better implement the frequency modulation method of primary frequency modulation and AGC coordinated control in the embodiment of the present invention, based on the frequency modulation method of primary frequency modulation and AGC coordinated control, correspondingly, Figure 5 As shown, the embodiment of the present invention further provides a frequency modulation device for coordinated control of primary frequency modulation and AGC, and the frequency modulation device 500 for coordinated control of primary frequency modulation and AGC includes: A first determination module 510 is used to determine the difference between the current grid connection point frequency and the rated frequency of the power grid when the load control direction of the primary frequency modulation instruction is inconsistent with the load control direction of the AGC instruction; A second determination module 520, configured to determine an active power instruction based on the line loss, a preset frequency deviation threshold and the difference; The frequency adjustment module 530 is used to adjust the load based on the active power instruction to adjust the frequency of the power grid.

[0069] The frequency modulation device 500 for coordinated control of primary frequency modulation and AGC provided in the above embodiment can implement the technical solution described in the above embodiment of the frequency modulation method for coordinated control of primary frequency modulation and AGC. The specific implementation principles of the above modules or units can refer to the corresponding contents in the embodiment of the frequency modulation method for coordinated control of primary frequency modulation and AGC, which will not be repeated here.

[0070] Based on the above-mentioned frequency modulation device for coordinated control of primary frequency modulation and AGC, an embodiment of the present invention further provides an energy storage system, including the frequency modulation device for coordinated control of primary frequency modulation and AGC described in the above-mentioned implementation manner.

[0071] Exemplarily, the energy storage system may be a wind energy storage system, a photovoltaic energy storage system or other energy storage systems, and the energy storage system includes a frequency regulation device with primary frequency regulation and AGC collaborative control provided in the above-mentioned embodiment, which directly adjusts the power balance of the power grid through rapid charging and discharging, thereby stabilizing the frequency.

[0072] Based on the above energy storage system, an embodiment of the present invention further provides a generator set, including the energy storage system described in the above implementation manner.

[0073] Generator sets can be thermal power units, wind farms, photovoltaic power stations, etc., which convert other forms of energy (such as hydropower, wind power, fuel combustion, etc.) into electrical energy. Generator sets are equipped with energy storage systems, which can be used to store energy and release it when needed. Generator sets are equipped with energy storage systems to improve their frequency regulation capabilities.

[0074] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware (such as a processor, a controller, etc.) through a computer program, and the computer program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0075] The frequency modulation method, device and energy storage system for coordinated control of primary frequency modulation and AGC provided by the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A frequency modulation method for coordinated control of primary frequency modulation and AGC, characterized in that: include: When the load control direction of the primary frequency modulation instruction is inconsistent with the load control direction of the AGC instruction, the difference between the current grid connection point frequency and the rated frequency of the grid is determined; Determining an active power command based on the line loss, a preset frequency deviation threshold and the difference; The load is adjusted based on the active power command to adjust the frequency of the power grid.

2. The frequency modulation method of primary frequency modulation and AGC coordinated control according to claim 1, characterized in that: The determining of the active power instruction based on the line loss, the preset frequency deviation threshold and the difference includes: When the difference is lower than the preset frequency deviation threshold, the primary frequency modulation instruction, the AGC instruction and the line loss are superimposed to obtain the active power instruction.

3. The frequency modulation method of primary frequency modulation and AGC coordinated control according to claim 1, characterized in that: The determining of the active power instruction based on the line loss, the preset frequency deviation threshold and the difference includes: When the difference is higher than or equal to the preset frequency deviation threshold, the primary frequency modulation instruction and the line loss are superimposed to obtain the active power instruction.

4. The frequency modulation method of primary frequency modulation and AGC coordinated control according to claim 2 or 3, characterized in that: The expression of the active power instruction is as follows: in, P 总 Indicates active command. Indicates the frequency modulation target value, Indicates the AGC instruction at the current moment, Indicates the AGC instruction at the initial moment of the frequency modulation action. P 损耗 represents the line loss, Indicates the rated frequency of the power grid, Indicates the current grid connection point frequency, Indicates the frequency deviation threshold.

5. The frequency modulation method of primary frequency modulation and AGC coordinated control according to claim 1, characterized in that: Also includes: When the load control direction of the primary frequency modulation instruction is consistent with the load control direction of the AGC instruction, the primary frequency modulation instruction, the AGC instruction and the line loss are superimposed to obtain the active power instruction.

6. The frequency modulation method of primary frequency modulation and AGC coordinated control according to claim 5, characterized in that: The expression of the active power instruction is as follows: in, P 总 Indicates active command. Indicates the frequency modulation target value, Indicates the AGC instruction at the current moment, Indicates the AGC instruction at the initial moment of the frequency modulation action. P 损耗 Indicates line loss.

7. The frequency modulation method of primary frequency modulation and AGC coordinated control according to claim 1, characterized in that: The preset frequency deviation threshold value ranges from 0.05 Hz to 0.2 Hz.

8. A frequency modulation device with coordinated control of primary frequency modulation and AGC, characterized in that: include: A first determination module is used to determine the difference between the current grid connection point frequency and the rated frequency of the power grid when the load control direction of the primary frequency modulation instruction is inconsistent with the load control direction of the AGC instruction; A second determination module, configured to determine an active power instruction based on the line loss, a preset frequency deviation threshold and the difference; The frequency regulation module is used to adjust the load based on the active power instruction to adjust the frequency of the power grid.

9. An energy storage system, characterized in that: A frequency modulation device comprising the primary frequency modulation and AGC coordinated control as described in claim 8.

10. A generator set, characterized in that: Includes the energy storage system as described in claim 9.

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