A power grid energy storage primary frequency modulation control method and device, a terminal and a medium

Abstract

The application discloses a power grid energy storage primary frequency modulation control method and device, a terminal and a medium. The scheme provided by the application first monitors the power grid frequency difference of a power grid system. In a normal operation state, the power grid power compensation amount is determined according to conventional primary frequency modulation linear compensation logic, so as to control the power release of an energy storage station according to the power grid power compensation amount. When the power grid frequency difference is lower than or equal to a preset first frequency difference threshold, it can be determined that the power grid system enters an emergency state. At this time, the power grid power compensation amount is updated to a preset rated maximum compensation amount, and the power release of the energy storage station is controlled according to the updated power grid power compensation amount, so that the energy storage station has the ability to quickly respond to support the system after the power grid system enters the emergency state, to prevent the system frequency from continuously and rapidly decreasing. Through the strategy of implementing full-power discharge in advance, the active power of the energy storage is released in time, to support the active power loss of the system, thereby avoiding further expansion of the system frequency deviation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power grid frequency modulation control, and particularly relates to a power grid energy storage primary frequency modulation control method and device, a terminal and a medium. BACKGROUND

[0002] The fluctuation of the power generation capacity of new energy and the active balance impact on the power grid after the failure of a power source or tie line is very large, which will directly lead to severe fluctuations in the frequency of the power grid, posing a great threat to the safety of power system operation. This large power loss during stable system operation leads to the destruction of the active balance of the power grid, which can be defined in the present application as a power grid emergency. Building a storage power station that can quickly respond to changes in the frequency of the power grid is one of the important means to solve the above problems in the construction of new power systems. Among them, the primary frequency modulation function of the storage power station plays a very key role in the frequency adjustment process of the power grid. Under this background, designing a primary frequency modulation compensation strategy for the storage power station in the emergency of the power grid has important practical significance for the development of power grid construction.

[0003] However, the existing primary frequency modulation compensation amount of the storage energy is designed by following the compensation algorithm of the primary frequency modulation scheme of the traditional power source. This algorithm is basically consistent with the primary frequency modulation function of the traditional prime mover, only the size of the frequency modulation compensation is different, but this frequency modulation method ignores the fast response characteristics of the storage energy, and has the technical problem of low regulation efficiency. SUMMARY

[0004] The present application provides a power grid energy storage primary frequency modulation control method, device, terminal and medium, which is used to solve the technical problem that the existing primary frequency modulation method of the storage energy ignores the fast response characteristics of the storage energy and has low regulation efficiency.

[0005] To solve the above technical problems, the first aspect of the present application provides a power grid energy storage primary frequency modulation control method, characterized in that it comprises:

[0006] monitoring the actual frequency of the power grid system, calculating the difference between the actual frequency and the preset rated frequency to obtain the power grid frequency difference;

[0007] According to the power grid frequency difference, determining the power compensation amount according to the preset primary frequency modulation linear compensation logic, to control the power release of the storage power station according to the power compensation amount of the power grid;

[0008] when the grid frequency difference is lower than a preset first frequency difference threshold, updating the grid power compensation amount to a preset rated maximum compensation amount, and controlling power release of the energy storage station according to the updated grid power compensation amount, wherein the first frequency difference threshold is in a range from a second frequency difference threshold to a negative frequency difference dead zone boundary value, and the second frequency difference threshold is a critical value of the grid frequency difference corresponding to the rated maximum compensation amount in the primary frequency modulation linear compensation logic.

[0009] Preferably, when the grid frequency difference is lower than a preset first frequency difference threshold, updating the grid power compensation amount to a preset rated maximum compensation amount further comprises:

[0010] According to the real-time grid frequency difference, when the grid frequency difference is still lower than the positive frequency difference dead zone boundary value, maintaining the grid power compensation amount as the rated maximum compensation amount.

[0011] When the grid frequency difference reaches the positive frequency difference dead zone boundary value, the maintaining of the grid power compensation amount is released, and the grid power compensation amount is determined again according to the primary frequency modulation linear compensation logic.

[0012] Preferably, the rated maximum compensation amount is a rated output of the energy storage station.

[0013] Preferably, according to the grid frequency difference, the grid power compensation amount is determined according to a preset primary frequency modulation linear compensation logic, specifically comprising:

[0014] When the grid frequency difference is in a frequency difference dead zone range, the grid power compensation amount is 0.

[0015] When the grid frequency difference is greater than or equal to the first frequency difference threshold and less than the negative frequency difference dead zone boundary value, the grid power compensation amount is determined according to a preset first compensation amount calculation formula.

[0016] When the grid frequency difference is greater than the positive frequency difference dead zone boundary value and less than a third frequency difference threshold, the grid power compensation amount is determined according to a preset second compensation amount calculation formula.

[0017] When the grid frequency difference is greater than or equal to the third frequency difference threshold, the grid power compensation amount is a preset rated minimum compensation amount.

[0018] Preferably, the first compensation amount calculation formula is specifically:

[0019]

[0020] In the formula, is the grid power compensation amount, is the grid frequency difference, is a positive frequency difference dead zone boundary value, f0 is the rated frequency, Pn is the rated output of the energy storage station, and δ is a droop characteristic parameter speed difference rate.

[0021] Preferably, the second compensation amount calculation formula is specifically:

[0022]

[0023] wherein, is the grid power compensation amount, is the grid frequency difference, is a positive frequency difference dead zone boundary value, f0 is the rated frequency, Pn is the rated output of the energy storage station, and δ is a droop characteristic parameter speed difference rate.

[0024] Preferably, the rated minimum compensation amount is the opposite of the rated maximum compensation amount.

[0025] Meanwhile, the second aspect of the present application provides a grid energy storage primary frequency modulation control device, comprising:

[0026] a grid frequency difference monitoring unit, configured to monitor an actual frequency of a grid system, calculate a difference between the actual frequency and a preset rated frequency, and obtain a grid frequency difference;

[0027] a normal compensation control unit, configured to determine a grid power compensation amount according to the grid frequency difference and according to a preset primary frequency modulation linear compensation logic, and control power release of an energy storage station according to the grid power compensation amount;

[0028] an emergency compensation control unit, configured to update the grid power compensation amount to a preset rated maximum compensation amount when the grid frequency difference is lower than a preset first frequency difference threshold, and control power release of the energy storage station according to the updated grid power compensation amount, wherein the first frequency difference threshold has a value range of a second frequency difference threshold to a negative frequency difference dead zone boundary value, and the second frequency difference threshold is a critical value of the grid frequency difference corresponding to the rated maximum compensation amount in the primary frequency modulation linear compensation logic.

[0029] The third aspect of the present application provides a grid energy storage primary frequency modulation control terminal, comprising a storage and a processor.

[0030] The storage is configured to store program code corresponding to the grid energy storage primary frequency modulation control method provided in the first aspect of the present application.

[0031] The processor is configured to read and execute the program code.

[0032] The fourth aspect of the present application provides a computer readable storage medium, which stores program codes, and when the program codes are executed by a processor, the power grid energy storage primary frequency modulation control method according to the first aspect of the present application can be implemented.

[0033] From the above technical solutions, the present application has the following advantages:

[0034] The scheme provided by the present application first monitors the power grid frequency difference of the power grid system. In the normal operation state, the power grid power compensation amount is determined according to the conventional primary frequency modulation linear compensation logic, so as to control the power release of the energy storage station according to the power grid power compensation amount. When the power grid frequency difference is lower than or equal to the preset first frequency difference threshold, it is determined that the power grid system enters an emergency state. At this time, the power grid power compensation amount is updated to the preset rated maximum compensation amount, and the power release of the energy storage station is controlled according to the updated power grid power compensation amount, so that the energy storage station has the ability to quickly respond to support the system after the power grid system enters the emergency state, and prevent the system frequency from continuously and rapidly decreasing. By implementing the strategy of discharging full power in advance, the active power of the energy storage is released in time to support the active power loss of the system, so as to avoid further expansion of the system frequency deviation. BRIEF DESCRIPTION OF DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0036] Figure 1 The traditional primary frequency modulation compensation curve diagram for the existing energy storage station.

[0037] Figure 2 The flowchart of an embodiment of the power grid energy storage primary frequency modulation control method provided by the present application.

[0038] Figure 3 The flowchart of another embodiment of the power grid energy storage primary frequency modulation control method provided by the present application.

[0039] Figure 4 The primary frequency modulation compensation curve diagram based on the power grid energy storage primary frequency modulation control method provided by the present application.

[0040] Figure 5 The structural diagram of an embodiment of the power grid energy storage primary frequency modulation control device provided by the present application.

[0041] Figure 6A structural schematic diagram of an embodiment of a power grid energy storage primary frequency modulation control terminal provided by the present application DETAILED DESCRIPTION

[0042] In the process of power system frequency dynamic adjustment, it is usually divided into three stages, the initial stage relies on the inertia of the prime mover for active power compensation, the middle stage relies on the primary frequency modulation of the power source for fast compensation, and finally the adjustment is carried out with the AGC strategy of the power system to balance the active power and the load. The rotational inertia mentioned above is the inherent characteristic of the prime mover and is difficult to change. In the process of frequency dynamic adjustment, especially in the initial stage of active power failure of the system, the degree of frequency drop of the power grid is directly affected by the compensation amount and the rapidity of the primary frequency modulation of the power source. In the current operation process of the new power system, the rapidity and compensation amount of the primary frequency modulation of the energy storage are particularly important. For the energy storage system, the fast response capability is its basic characteristic, and the primary frequency modulation compensation function of the existing energy storage station is realized by following the related standards of the traditional power source. The compensation characteristics are as follows Figure 1 When the grid frequency difference value changes between the dead zone , the energy storage primary frequency modulation compensation amount is 0; when it exceeds the dead zone, the energy storage primary frequency modulation compensation amount is linearly compensated according to a certain slope with the frequency deviation value. When the frequency is greater than the rated frequency, the compensation amount is negative (the right half of the curve on the frequency axis), and vice versa. When the frequency deviation exceeds (typically ±0.2 Hz), the energy storage primary frequency modulation compensation amount is equal to the rated output of the energy storage system (with positive and negative differentiation).

[0043] The primary frequency modulation compensation curve of the energy storage station is a response curve with a dead zone and an amplitude limit. Only when the frequency reaches (typically -0.2 Hz) can the maximum discharge output be responded to, which ignores the fast response characteristic of the energy storage, so that the existing primary frequency modulation compensation logic of the energy storage station is difficult to release the active power of the energy storage in time to support the active power loss of the system when the system is faced with the situation that the active power balance is broken, thereby causing the further expansion of the frequency deviation of the system.

[0044] Therefore, the present application provides a power grid energy storage primary frequency modulation control method, device, terminal and medium, which is used to solve the technical problem of low regulation efficiency caused by the fact that the existing energy storage primary frequency modulation mode ignores the fast response characteristic of the energy storage.

[0045] In order to make the purposes, characteristics and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the embodiments described below are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0046] First, the detailed description of an embodiment of the power grid energy storage primary frequency modulation control method provided by the present application is as follows:

[0047] Please refer to Figure 2 The power grid energy storage primary frequency modulation control method provided by the embodiment includes:

[0048] Step 101, monitor the actual frequency of the power grid system, calculate the difference between the actual frequency and the preset rated frequency, and obtain the power grid frequency difference;

[0049] It should be noted that according to the control method provided by the embodiment, first, the existing monitoring equipment in the power grid system can be used to directly measure or collect the operation data of the power grid system, and the actual frequency of the power grid system can be calculated according to the existing frequency calculation method, and compared with the preset rated frequency, so as to obtain the frequency deviation of the power grid system, i.e. the power grid frequency difference, wherein the rated frequency is generally 50 Hz. Assuming that the collected frequency is f, the unit is Hz, and the frequency difference signal is When , it indicates that the power grid frequency is low; when , it indicates that the power grid frequency is high.

[0050] Step 102, according to the power grid frequency difference, determine the power grid power compensation amount according to the preset primary frequency modulation linear compensation logic, and control the power charge and discharge of the energy storage station according to the power grid power compensation amount;

[0051] Then, based on the power grid frequency difference obtained in the previous step, the power release of the energy storage station is controlled. Specifically, the scheme of the embodiment takes whether the power grid frequency difference is lower than the preset first frequency difference threshold (typically -0.1 Hz) as the judgment condition of the power grid emergency state, wherein When the judgment condition is not met, the system will compensate the power according to the conventional primary frequency modulation linear compensation logic to stabilize the system frequency.

[0052] More specifically, the primary frequency modulation linear compensation logic provided by the embodiment is obtained based on the conventional compensation logic with dead zone and amplitude limiting droop characteristics, and specifically includes:

[0053] When the power grid frequency difference is within the frequency difference dead zone range, the power grid power compensation amount is 0;

[0054] When the power grid frequency difference is greater than or equal to the first frequency difference threshold and less than the negative frequency difference dead zone boundary value, the power grid power compensation amount is determined according to the preset first compensation amount calculation formula;

[0055] When the grid frequency difference is greater than the positive frequency difference dead zone boundary value and less than the third frequency difference threshold, the grid power compensation amount is determined according to the preset second compensation amount calculation formula.

[0056] When the grid frequency difference is greater than or equal to the third frequency difference threshold, the grid power compensation amount is the preset rated minimum compensation amount.

[0057] Specifically, the primary frequency regulation linear compensation logic when the system is not in an emergency state can include the following situations: 1) When the grid frequency deviation is within the dead zone ( The primary frequency modulation compensation is: =0; 2) When the frequency difference hour, ;3) 4) hour, The specific compensation curve is as follows: Figure 1 of The interval is shown. In the formula, This is the power compensation amount for the power grid. For the power grid frequency difference, δ represents the boundary value of the positive frequency difference dead zone, f0 represents the rated frequency, Pn represents the rated output of the energy storage station, and δ represents the droop characteristic parameter, velocity unequal rate.

[0058] Step 103: When the grid frequency difference is lower than the preset first frequency difference threshold, update the grid power compensation amount to the preset rated maximum compensation amount, and control the power release of the energy storage station according to the updated grid power compensation amount.

[0059] The first frequency difference threshold ranges from the second frequency difference threshold to the boundary value of the negative frequency difference dead zone. The second frequency difference threshold is the grid frequency difference critical value corresponding to the rated maximum compensation amount in the primary frequency regulation linear compensation logic.

[0060] It should be noted that when the judgment condition is met, the power compensation amount of the grid is updated to the preset rated maximum compensation amount. The power release of the energy storage station is controlled according to the value of the rated maximum compensation amount, so that the energy storage station has the ability to quickly respond and support the system after the grid system enters an emergency state, preventing the system frequency from continuing to drop rapidly. By implementing the strategy of full power discharge in advance, the rapid response characteristics of the energy storage equipment can be fully utilized, and the support capability of the energy storage station in emergency situations with large active power loss of the grid can be improved, thereby avoiding the further expansion of the system frequency deviation.

[0061] Based on the above basic embodiments, the control method provided in this application may further include the following technical contents:

[0062] Furthermore, such as Figure 3As shown, after the determination condition in step 103 is triggered and the grid power compensation amount is updated to the preset rated maximum compensation amount, the following can also be included:

[0063] Step 104, according to the real-time grid frequency difference, when the grid frequency difference is lower than the positive frequency difference dead zone boundary value, the grid power compensation amount is maintained as the rated maximum compensation amount;

[0064] Step 105, when the grid frequency difference reaches the positive frequency difference dead zone boundary value, the maintenance of the grid power compensation amount is released, and the grid power compensation amount is determined again according to the primary frequency modulation linear compensation logic.

[0065] It should be noted that in the case of a large active power loss in the grid emergency, during the frequency fluctuation recovery process, the energy storage compensation effect suddenly decreases, which may cause the grid frequency to decrease again and the energy storage output to enter the maximum again, which may cause fluctuations in the energy storage output and further cause fluctuations in the grid frequency. Therefore, steps 104-105 of the embodiment add a hysteresis determination during the primary frequency modulation response process of the energy storage station, that is, during the gradual recovery process of the frequency, even if the frequency deviation is reduced to , the energy storage output is still maintained at the maximum output until the grid frequency enters the positive frequency difference dead zone boundary value . By adding this step, the damping characteristics of the system frequency modulation process can be increased, so that the system has a certain over-regulation effect, effectively avoiding fluctuations in the energy storage output and further avoiding fluctuations in the grid frequency, reducing the possibility of a second frequency bottoming out and further improving the stability of the grid system.

[0066] The complete energy storage station primary frequency modulation compensation curve under the complete grid emergency state provided by the embodiment is as shown in Figure 4 When the frequency difference , the compensation amount of the primary frequency modulation is .

[0067] When the grid frequency recovers to the interval, the compensation amount of the primary frequency modulation is still maintained as . That is, when the frequency difference (system state available state variable iFlag represents) has occurred and has not been reset (iFlag=TRUE), when , the compensation amount of the primary frequency modulation is . Then, as the system frequency recovers, when , the compensation of the emergency state ends and the corresponding state variable is reset. That is, iFlag=FALSE, at this time, the grid power compensation amount will be determined again according to the primary frequency modulation linear compensation logic mentioned in step 102.

[0068] The above is a detailed description of an embodiment of the power grid energy storage primary frequency modulation control method provided in the application. The following is a detailed description of an embodiment of a power grid energy storage primary frequency modulation control device provided in the application.

[0069] Please refer to Figure 5 The embodiment provides a power grid energy storage primary frequency modulation control device, which comprises:

[0070] The power grid frequency difference monitoring unit 201 is configured to monitor the actual frequency of the power grid system, calculate the difference between the actual frequency and the preset rated frequency, and obtain the power grid frequency difference.

[0071] The normal compensation control unit 202 is configured to determine the power grid power compensation amount according to the power grid frequency difference and according to a preset primary frequency modulation linear compensation logic, so as to control the power release of the energy storage station according to the power grid power compensation amount.

[0072] The emergency compensation control unit 203 is configured to update the power grid power compensation amount to a preset rated maximum compensation amount when the power grid frequency difference is lower than a preset first frequency difference threshold, and control the power release of the energy storage station according to the updated power grid power compensation amount, wherein the first frequency difference threshold is in a range from a second frequency difference threshold to a negative frequency difference dead zone boundary value, and the second frequency difference threshold is a critical value of the power grid frequency difference corresponding to the rated maximum compensation amount in the primary frequency modulation linear compensation logic.

[0073] Further, after the power grid power compensation amount is updated to the preset rated maximum compensation amount when the power grid frequency difference is lower than the preset first frequency difference threshold, the following is further included:

[0074] The compensation amount locking unit 204 is configured to maintain the power grid power compensation amount as the rated maximum compensation amount when the power grid frequency difference is lower than a positive frequency difference dead zone boundary value according to the real-time power grid frequency difference, and release the maintenance of the power grid power compensation amount when the power grid frequency difference reaches the positive frequency difference dead zone boundary value, and determine the power grid power compensation amount again according to the primary frequency modulation linear compensation logic in the normal compensation control unit 202.

[0075] Further, the rated maximum compensation amount is the rated output of the energy storage station.

[0076] Further, the determination of the power grid power compensation amount according to the power grid frequency difference and according to the preset primary frequency modulation linear compensation logic specifically comprises:

[0077] When the power grid frequency difference is in the frequency difference dead zone range, the power grid power compensation amount is 0;

[0078] When the power grid frequency difference is greater than or equal to the first frequency difference threshold and less than the negative frequency difference dead zone boundary value, the power grid power compensation amount is determined according to a preset first compensation amount calculation formula;

[0079] When the grid frequency difference is greater than the positive frequency difference dead zone boundary value and less than the third frequency difference threshold, the grid power compensation amount is determined according to the preset second compensation amount calculation formula.

[0080] When the grid frequency difference is greater than or equal to the third frequency difference threshold, the grid power compensation amount is the preset rated minimum compensation amount.

[0081] Furthermore, the specific formula for calculating the first compensation amount is as follows:

[0082]

[0083] In the formula, This is the power compensation amount for the power grid. For the power grid frequency difference, δ represents the boundary value of the positive frequency difference dead zone, f0 represents the rated frequency, Pn represents the rated output of the energy storage station, and δ represents the droop characteristic parameter, velocity unequal rate.

[0084] Furthermore, the formula for calculating the second compensation amount is as follows:

[0085]

[0086] In the formula, This is the power compensation amount for the power grid. For the power grid frequency difference, δ represents the boundary value of the positive frequency difference dead zone, f0 represents the rated frequency, Pn represents the rated output of the energy storage station, and δ represents the droop characteristic parameter, velocity unequal rate.

[0087] Furthermore, the rated minimum compensation amount is the opposite of the rated maximum compensation amount.

[0088] like Figure 6 As shown, the third aspect of this application also provides an embodiment of a primary frequency regulation control terminal for grid energy storage, wherein the terminal implementation type includes: personal computer, server and embedded intelligent device, and the main components of the terminal include: storage 33 and processor 31, which can be connected through communication bus 34;

[0089] The memory 33 is used to store program code, which corresponds to a primary frequency regulation control method for grid energy storage as provided in the first aspect of this application;

[0090] Processor 31 is used to read and execute program code.

[0091] The fourth aspect of this application provides a computer-readable storage medium storing program code, which, when executed by a processor, can implement a primary frequency regulation control method for grid energy storage as provided in the first aspect of this application.

[0092] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the terminal, the device and the unit described above can refer to the corresponding processes in the foregoing method embodiments, and will not be described here.

[0093] In several embodiments provided in the present application, it should be understood that the disclosed terminal, device and method can be implemented in other manners. For example, the described device embodiments are merely schematic, and the division of the units is merely a logical function division, and there can be another division manner in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections can be indirect couplings or communication connections through some interfaces, devices or units, and can be electrical, mechanical or in other forms.

[0094] The terms "first", "second", "third", "fourth" and the like in the description of the present application and the above drawings (if any) are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in other than the order shown or described herein. In addition, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0095] It should be understood that, in the present application, "at least one" means one or more, and "multiple" means two or more. "And / or" is used to describe the association relationship of the associated objects, which means that there can be three relationships, for example, "A and / or B" can mean that there are three cases of only A, only B and A and B at the same time, and A and B can be singular or plural. The character " / " generally represents that the associated objects before and after are in an "or" relationship. "At least one of the following" or similar expressions means any combination of these items, including any combination of single item or multiple items. For example, at least one of a, b or c can mean a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0096] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, i.e. may be located in one place, or may be distributed on multiple network units. Part or all of the units may be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0097] In addition, each functional unit in each embodiment of the application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0098] The integrated unit, if realized in the form of a software functional unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the application, essentially or the part that contributes to the prior art, or all or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a number of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various program code storage media.

[0099] The above-described embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A primary frequency regulation control method for power grid energy storage, characterized in that, include: Monitor the actual frequency of the power grid system, calculate the difference between the actual frequency and the preset rated frequency, and obtain the power grid frequency difference; Based on the grid frequency difference, the grid power compensation amount is determined according to the preset primary frequency regulation linear compensation logic, so as to control the power release of the energy storage station according to the grid power compensation amount; When the grid frequency difference is lower than the preset first frequency difference threshold, the grid power compensation amount is updated to the preset rated maximum compensation amount, and the power release of the energy storage station is controlled according to the updated grid power compensation amount. The value range of the first frequency difference threshold is from the second frequency difference threshold to the negative frequency difference dead zone boundary value. The second frequency difference threshold is: the grid frequency difference critical value corresponding to the rated maximum compensation amount in the primary frequency regulation linear compensation logic. Based on the real-time grid frequency difference, when the grid frequency difference is lower than the positive frequency difference dead zone boundary value, the grid power compensation amount is maintained at the rated maximum compensation amount; When the grid frequency difference reaches the positive frequency difference dead zone boundary value, the maintenance of the grid power compensation amount is released, and the grid power compensation amount is re-determined according to the primary frequency regulation linear compensation logic.

2. The primary frequency regulation control method for power grid energy storage according to claim 1, characterized in that, The rated maximum compensation amount is: the rated output of the energy storage station.

3. The primary frequency regulation control method for power grid energy storage according to claim 1, characterized in that, Based on the grid frequency difference, and according to the preset primary frequency regulation linear compensation logic, the specific grid power compensation amount is determined as follows: When the power grid frequency difference is within the frequency difference dead zone, the power grid power compensation is 0. When the power grid frequency difference is greater than or equal to the first frequency difference threshold and less than the negative frequency difference dead zone boundary value, the power grid power compensation amount is determined according to the preset first compensation amount calculation formula. When the power grid frequency difference is greater than the positive frequency difference dead zone boundary value and less than the third frequency difference threshold, the power grid power compensation amount is determined according to the preset second compensation amount calculation formula. When the power grid frequency difference is greater than or equal to the third frequency difference threshold, the power grid power compensation amount is the preset rated minimum compensation amount.

4. The primary frequency regulation control method for power grid energy storage according to claim 3, characterized in that, The specific formula for calculating the first compensation amount is as follows: ； In the formula, This is the power compensation amount for the power grid. The frequency difference of the power grid, δ is the boundary value of the positive frequency difference dead zone, f0 is the rated frequency, Pn is the rated output of the energy storage station, and δ is the droop characteristic parameter velocity unequal rate.

5. The primary frequency regulation control method for power grid energy storage according to claim 3, characterized in that, The second compensation amount is calculated as follows: ； In the formula, This is the power compensation amount for the power grid. The frequency difference of the power grid, δ is the boundary value of the positive frequency difference dead zone, f0 is the rated frequency, Pn is the rated output of the energy storage station, and δ is the droop characteristic parameter velocity unequal rate.

6. The primary frequency regulation control method for power grid energy storage according to claim 3, characterized in that, The rated minimum compensation amount is the opposite of the rated maximum compensation amount.

7. A primary frequency regulation control device for power grid energy storage, characterized in that, include: The power grid frequency difference monitoring unit is used to monitor the actual frequency of the power grid system, calculate the difference between the actual frequency and the preset rated frequency, and obtain the power grid frequency difference. The normal compensation control unit is used to determine the power compensation amount of the power grid according to the power grid frequency difference and according to the preset primary frequency regulation linear compensation logic, so as to control the power release of the energy storage station according to the power compensation amount of the power grid. An emergency compensation control unit is used to update the grid power compensation amount to a preset rated maximum compensation amount when the grid frequency difference is lower than a preset first frequency difference threshold, and to control the power release of the energy storage station according to the updated grid power compensation amount. The value range of the first frequency difference threshold is from a second frequency difference threshold to the negative frequency difference dead zone boundary value. The second frequency difference threshold is the grid frequency difference critical value corresponding to the rated maximum compensation amount in the primary frequency regulation linear compensation logic. The compensation amount blocking unit is used to maintain the grid power compensation amount at the rated maximum compensation amount when the grid frequency difference is lower than the positive frequency difference dead zone boundary value, based on the real-time grid frequency difference. When the grid frequency difference reaches the positive frequency difference dead zone boundary value, the unit releases the maintenance of the grid power compensation amount and re-determines the grid power compensation amount according to the primary frequency regulation linear compensation logic.

8. A primary frequency regulation control terminal for power grid energy storage, characterized in that, include: Memory and processor; The memory is used to store program code, which corresponds to a primary frequency regulation control method for grid energy storage as described in any one of claims 1 to 6; The processor is used to read and execute the program code.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores program code, which, when executed by a processor, can implement a primary frequency regulation control method for grid energy storage as described in any one of claims 1 to 6.

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