Power grid energy storage primary frequency modulation control method and device, terminal and medium

Abstract

The invention discloses a power grid energy storage primary frequency modulation control method and device, a terminal and a medium, and the method comprises the steps: firstly, monitoring the power grid frequency difference of a power grid system, and in a normal operation state, determining the power compensation amount of a power grid according to a conventional primary frequency modulation linear compensation logic; when the power grid frequency difference is lower than or equal to a preset first frequency difference threshold value, it can be judged that a power grid system enters an emergency state, and at the moment, the power grid power compensation amount is updated to be a preset rated maximum compensation amount; and controlling the power release of the energy storage station according to the updated power grid power compensation amount, so that the energy storage station has the capability of quickly responding to support the system and preventing the system frequency from continuously and quickly decreasing after the power grid system enters an emergency state, and the energy storage active power is released in time by implementing a full-power discharge strategy in advance to support the active power loss of the system, so that the energy storage efficiency is improved. And further expansion of the system frequency deviation is avoided.

Description

Technical Field

[0001] This application relates to the technical field of power grid frequency modulation control, and particularly relates to a primary frequency modulation control method, device, terminal and medium for power grid energy storage. Background Art

[0002] The volatility of the power generation capacity of new energy and the failure of a certain power source or tie line will cause a very large impact on the active power balance of the power grid, directly leading to violent fluctuations in the power grid frequency, posing a great threat to the safety of power system operation. This large power loss that occurs during the stable operation of the system and causes the destruction of the active power balance of the power grid can be defined as a power grid emergency state in this application. One of the important problems that need to be solved urgently in building a new power system is to build an energy storage power station that can quickly respond to the changes in the power grid frequency, which is one of the important means to solve the above problems. Among them, the primary frequency modulation function of the energy storage power station plays a very crucial role in the frequency adjustment process of the power grid. In this context, designing a primary frequency modulation compensation strategy for the energy storage power station in the event of a power grid emergency has important practical significance for the development of power grid construction.

[0003] However, the existing primary frequency modulation compensation amount of energy storage follows the compensation algorithm designed for the traditional power source primary frequency modulation scheme. This algorithm is basically the same as the primary frequency modulation function of the traditional prime mover, only the magnitude of the frequency modulation compensation is different. However, this frequency modulation method ignores the fast response characteristics of energy storage and has the technical problem of low regulation efficiency. Summary of the Invention

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

[0005] To solve the above technical problems, the first aspect of this application provides a primary frequency modulation control method for power grid energy storage, which is characterized by including:

[0006] Monitor the actual frequency of the power grid system, calculate 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, determine the power grid power compensation amount according to the 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;

[0008] When the grid frequency difference is lower than a preset first frequency difference threshold, update the grid power compensation amount to a preset rated maximum compensation amount, and control the power release of the energy storage station according to the updated grid power compensation amount, where 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, and the second frequency difference threshold is: the critical grid frequency difference corresponding to the rated maximum compensation amount in the primary frequency modulation linear compensation logic.

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

[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, keep 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, release the hold on the grid power compensation amount, and re-determine the grid power compensation amount according to the primary frequency modulation linear compensation logic.

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

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

[0014] When the grid frequency difference is within the 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, determine the grid power compensation amount 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, determine the grid power compensation amount 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, Δf is the 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 the droop characteristic parameter speed regulation rate.

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

[0022]

[0023] In the formula, is the power compensation amount of the power grid, is the frequency difference of the power grid, Δf is the 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 the droop characteristic parameter speed regulation 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 primary frequency modulation control device for grid energy storage, including:

[0026] A grid frequency difference monitoring unit for monitoring the actual frequency of the power grid system, calculating the difference between the actual frequency and the preset rated frequency to obtain the grid frequency difference;

[0027] A normal compensation control unit for determining the power compensation amount of the power grid according to the grid frequency difference according to the preset primary frequency modulation 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;

[0028] An emergency compensation control unit for updating the power compensation amount of the power grid to the preset rated maximum compensation amount when the grid frequency difference is lower than the preset first frequency difference threshold, and controlling the power release of the energy storage station according to the updated power compensation amount of the power grid, wherein 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, and the second frequency difference threshold is: in the primary frequency modulation linear compensation logic, the grid frequency difference critical value corresponding to the rated maximum compensation amount.

[0029] The third aspect of the present application provides a primary frequency modulation control terminal for grid energy storage, including: a storage and a processor;

[0030] The memory is used to store program codes, and the program codes correspond to a primary frequency modulation control method for grid energy storage provided by the first aspect of the present application;

[0031] The processor is used to read and execute the program codes.

[0032] The fourth aspect of the present application provides a computer-readable storage medium, which stores program code. When the program code is executed by a processor, it can implement a primary frequency regulation control method for grid energy storage provided in the first aspect of the present application.

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

[0034] The solution provided by the present application first monitors the grid frequency difference of the power grid system. Under normal operating conditions, it first determines the grid power compensation amount according to the conventional primary frequency regulation linear compensation logic, and controls the power release of the energy storage station according to the grid power compensation amount. When the 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 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 grid power compensation amount, so that the energy storage station has the ability to quickly respond and support the system after the power grid system enters an emergency state, preventing the system frequency from continuously and rapidly decreasing. By implementing the strategy of full-power discharge in advance, the active power of the energy storage is released in time to support the active power shortage of the system, thereby avoiding further expansion of the system frequency deviation. Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 It is a traditional primary frequency regulation compensation curve diagram of an existing energy storage station.

[0037] Figure 2 It is a schematic flowchart of an embodiment of a primary frequency regulation control method for grid energy storage provided by the present application.

[0038] Figure 3 It is a schematic flowchart of another embodiment of a primary frequency regulation control method for grid energy storage provided by the present application.

[0039] Figure 4 It is a primary frequency regulation compensation curve diagram based on the primary frequency regulation control method for grid energy storage provided by the present application.

[0040] Figure 5 It is a schematic structural diagram of an embodiment of a primary frequency regulation control device for grid energy storage provided by the present application.

[0041] Figure 6Schematic structural diagram of an embodiment of a primary frequency regulation control terminal for power grid energy storage provided by this application Detailed implementation manners

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

[0043] The primary frequency regulation compensation curve of the energy storage station is a response curve with dead zones and amplitude limits. Only when the frequency reaches (usually -0.2Hz) does it respond to the maximum discharge output, ignoring the rapid response characteristic of the energy storage, resulting in the primary frequency regulation compensation logic of the existing energy storage station being difficult to release the active power of the energy storage in time to support the active power shortage of the system when facing the situation of the active power balance being broken due to a large power loss in the system, thus leading to the further expansion of the system frequency deviation.

[0044] In view of this, this application provides a primary frequency regulation control method, device, terminal and medium for power grid energy storage, which is used to solve the technical problem that the existing primary frequency regulation method of the energy storage ignores the rapid response characteristic of the energy storage and has low regulation efficiency.

[0045] In order to make the invention purpose, features and advantages of this application more obvious and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the embodiments described below are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of this application.

[0046] First, a detailed description of an embodiment of a primary frequency regulation control method for power grid energy storage provided by this application is as follows:

[0047] Please refer to Figure 2 , a primary frequency regulation control method for power grid energy storage provided by this 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 this embodiment, first, through the existing monitoring equipment in the power grid system, the operation data of the power grid system can be directly measured or collected, and according to the existing frequency calculation method, the actual frequency of the power grid system can be calculated, compared with the preset rated frequency, so as to obtain the frequency deviation of the power grid system, that is, the power grid frequency difference. Among them, the value of the rated frequency is generally 50Hz. Assuming that the collected frequency is f, in Hz, then the frequency difference signal is . When , it means that the power grid frequency is low; when , it means 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 regulation linear compensation logic, so as to control the power charge and discharge of the energy storage station according to the power grid power compensation amount;

[0051] Next, based on the power grid frequency difference obtained in the previous step, control the power release of the energy storage station. Specifically, the solution of this embodiment uses whether the power grid frequency difference is lower than the preset first frequency difference threshold (usually -0.1Hz) as the determination condition for the power grid emergency state, where , when this determination condition is not met, the system will perform power compensation on the system according to the conventional primary frequency regulation linear compensation logic to stabilize the system frequency.

[0052] More specifically, the primary frequency regulation linear compensation logic provided by this embodiment is obtained based on the conventional compensation logic with dead zone and limit of the droop characteristic, 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 a 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 modulation linear compensation logic when the system is not in an emergency state may include the following situations: 1) When the grid frequency deviation is within the dead zone ( ), the primary frequency modulation compensation amount is, =0; 2) When the frequency difference ), ; 3) . 4) ), , and the specific compensation curve is as shown in the Figure 1 interval of . In the formula, is the grid power compensation amount, is the grid frequency difference, is the 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 the droop characteristic parameter speed regulation rate.

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

[0059] Among them, 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, and the second frequency difference threshold is: the grid frequency difference critical value corresponding to the rated maximum compensation amount in the primary frequency modulation linear compensation logic.

[0060] It should be noted that when it is detected that the determination condition is satisfied, the grid power compensation amount is updated to a preset rated maximum compensation amount, so as to control the power release of the energy storage station 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 power grid system enters an emergency state, prevent the system frequency from continuously and rapidly decreasing, and by implementing the strategy of full-power discharge in advance, the fast response characteristics of the energy storage equipment can be fully utilized, and the support ability of the energy storage station in an emergency with a large active power shortage in the power grid can be improved, so as to avoid the further expansion of the system frequency deviation.

[0061] On the basis of the above basic embodiment, the control method provided by this application may further include the following technical content:

[0062] Further, 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 may 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, keep the grid power compensation amount as the rated maximum compensation amount;

[0064] Step 105: When the grid frequency difference reaches the positive frequency difference dead zone boundary value, release the hold on the grid power compensation amount and re-determine the grid power compensation amount 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 an emergency of the power grid, during the process of frequency fluctuation recovery, after the energy storage compensation effect suddenly decreases, it may cause the grid frequency to decrease again, and the energy storage output enters the maximum again, which may lead to fluctuations in the energy storage output, and then trigger fluctuations in the grid frequency. For this reason, in steps 104 to 105 of this embodiment, a hysteresis determination is added to the primary frequency modulation response process of the energy storage station, that is, during the process of gradual frequency recovery, even if the frequency deviation shrinks to within, the energy storage output still remains at the maximum output until the grid frequency enters the dead zone boundary value of the positive frequency difference . By adding this step, the damping characteristic of the frequency modulation process of the system can be increased, so that the system has a certain overshoot effect, effectively avoiding fluctuations in the energy storage output, and then avoiding triggering fluctuations in the grid frequency, slowing down the possibility of the frequency showing a second dip, and further improving the stability of the power grid system.

[0066] The complete primary frequency modulation compensation curve of the energy storage station under the emergency state of the power grid provided by this embodiment is as Figure 4 shown. When the frequency difference , according to the operation of step 103, at this time, the compensation amount of the primary frequency modulation is .

[0067] When the grid frequency recovers to interval, still keep the compensation amount of the primary frequency modulation as . That is, when there has been a frequency difference (the system state can be represented by the state variable iFlag), and when it is not reset (iFlag = TRUE), when , the compensation amount of the primary frequency modulation is . Then, as the system frequency recovers, when , the compensation in 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 re-determined according to the primary frequency modulation linear compensation logic mentioned in step 102.

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

[0069] See also Figure 5 This embodiment provides a power grid energy storage primary frequency regulation control device, including:

[0070] The power grid frequency difference monitoring unit 201 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;

[0071] The normal compensation control unit 202 is used to determine the grid power compensation amount according to the grid frequency difference and 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;

[0072] The emergency compensation control unit 203 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 control the power release of the energy storage station according to the updated grid power compensation amount, wherein 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, and the second frequency difference threshold is: in the primary frequency regulation linear compensation logic, the grid frequency difference critical value corresponding to the rated maximum compensation amount.

[0073] Further, 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 includes:

[0074] The compensation amount locking unit 204 is used to maintain the grid power compensation amount at the rated maximum compensation amount according to the real-time grid frequency difference when the grid frequency difference is lower than the positive frequency difference dead zone boundary value; when the grid frequency difference reaches the positive frequency difference dead zone boundary value, the grid power compensation amount is released and the grid power compensation amount is re-determined according to the primary frequency modulation linear compensation logic in the normal compensation control unit 202.

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

[0076] Further, according to the grid frequency difference and the preset primary frequency regulation linear compensation logic, determining the grid power compensation amount specifically includes:

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

[0078] 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 the 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] Further, the first compensation amount calculation formula is specifically:

[0082]

[0083] In the formula, is the grid power compensation amount, is the grid frequency difference, is the 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 the droop characteristic parameter speed regulation rate.

[0084] Further, the second compensation amount calculation formula is specifically:

[0085]

[0086] In the formula, is the grid power compensation amount, is the grid frequency difference, is the 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 the droop characteristic parameter speed regulation rate.

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

[0088] As Figure 6 shown, the third aspect of the present application also provides an embodiment of a grid energy storage primary frequency modulation control terminal, where the implementation types of the terminal include: personal computer, server, and embedded intelligent device. The main components of the terminal include: a memory 33 and a processor 31, and the memory 33 and the processor 31 can be connected through a communication bus 34;

[0089] The memory 33 is used to store program codes, and the program codes correspond to a grid energy storage primary frequency modulation control method provided in the first aspect of the present application;

[0090] The processor 31 is used to read and execute the program codes.

[0091] The fourth aspect of the present application provides a computer-readable storage medium, and the computer-readable storage medium stores program codes. When the program codes are executed by a processor, a grid energy storage primary frequency modulation control method provided in the first aspect of the present application can be implemented.

[0092] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the terminals, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0093] In several embodiments provided in the present application, it should be understood that the disclosed terminals, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed mutual coupling, direct coupling, or communication connection can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be in electrical, mechanical, or other forms.

[0094] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments of the present application described herein, for example, can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" 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 have to be limited to those clearly listed steps or units, but may 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 (item)" means one or more, and "multiple" means two or more. "And / or" is used to describe the association relationship of associated objects and indicates that there can be three relationships. For example, "A and / or B" can represent: only A exists, only B exists, and both A and B exist at the same time. Among them, A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects before and after. "At least one (one) of the following" or its similar expression refers to any combination of these items, including any combination of single item (one) or plural items (ones). For example, at least one (one) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0096] The unit described as a separation component may or may not be physically separated. The component shown as a unit may or may not be a physical unit, that is, it may be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0097] In addition, each functional unit in various embodiments of the present invention may be integrated into one processing unit, may exist separately as individual physical units, or two or more units may be integrated into one unit. The above integrated units can be implemented in the form of hardware or in the form of software functional units.

[0098] If the above integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of this 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 for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present invention. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0099] As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of various embodiments of the present application.

Claims

1. A method for controlling primary frequency modulation of 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; According to the grid frequency difference, according to the preset primary frequency regulation linear compensation logic, a grid power compensation amount is determined, 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, wherein 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, and the second frequency difference threshold is: in the primary frequency modulation linear compensation logic, the grid frequency difference critical value corresponding to the rated maximum compensation amount.

2. A power grid energy storage primary frequency modulation control method according to claim 1, characterized in that: 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 includes: According to the real-time grid frequency difference, when the grid frequency difference is lower than the positive frequency difference dead zone boundary value, maintaining the grid power compensation amount at the rated maximum compensation amount; When the grid frequency difference reaches the positive frequency difference dead zone boundary value, the grid power compensation amount is released and the grid power compensation amount is re-determined according to the primary frequency modulation linear compensation logic.

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

4. A method for controlling primary frequency modulation of power grid energy storage according to claim 1, characterized in that: According to the grid frequency difference and the preset primary frequency regulation linear compensation logic, determining the grid power compensation amount specifically includes: When the grid frequency difference is within the frequency difference dead zone, the grid power compensation amount is 0; 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; 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 a preset second compensation amount calculation formula; 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.

5. A method for controlling primary frequency modulation of power grid energy storage according to claim 4, characterized in that: The first compensation amount calculation formula is specifically: In the formula, is the power compensation amount of the power grid, is the grid frequency difference, is the 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 the speed inequality rate of the droop characteristic parameter.

6. A method for controlling primary frequency modulation of power grid energy storage according to claim 4, characterized in that: The second compensation amount calculation formula is specifically: In the formula, is the power compensation amount of the power grid, is the grid frequency difference, is the 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 the speed inequality rate of the droop characteristic parameter.

7. A power grid energy storage primary frequency modulation control method according to claim 4, characterized in that: The rated minimum compensation amount is the opposite of the rated maximum compensation amount.

8. A power grid energy storage primary frequency modulation control device, characterized in that: include: A power grid frequency difference monitoring unit, 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; A normal compensation control unit, used to determine the grid power compensation amount according to the grid frequency difference and 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; 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 control the power release of the energy storage station according to the updated grid power compensation amount, wherein 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, and the second frequency difference threshold is: in the primary frequency modulation linear compensation logic, the grid frequency difference critical value corresponding to the rated maximum compensation amount.

9. A power grid energy storage primary frequency modulation control terminal, characterized in that: include: storage and processors; The memory is used to store program codes, and the program codes correspond to a power grid energy storage primary frequency regulation control method according to any one of claims 1 to 7; The processor is used for reading and executing the program code.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores program code, and when the program code is executed by a processor, a power grid energy storage primary frequency regulation control method as described in any one of claims 1 to 7 can be implemented.

Images