Power grid frequency control method and apparatus, and device and storage medium

Abstract

Disclosed in the present application are a power grid frequency control method and apparatus, and a device and a storage medium. The method comprises: on the basis of a frequency change rate after the frequency of a power grid exceeds a limit and a first preset expected change rate, sending a first active power adjustment instruction to an energy storage device; determining a target time on the basis of a predicted adjustment duration and an instruction delay duration, and determining a second active power adjustment value on the basis of a second preset expected change rate; and sending a second active power adjustment instruction to the energy storage device at the target time. In the technical solution in the embodiments of the present application, a sending time of an instruction is distinguished from an execution time of the energy storage device, and by means of estimating a sending time of the second active power adjustment instruction, the frequency of the power grid can be kept close to a preset frequency, such as 50 Hz, when the energy storage device executes the second active power adjustment instruction. Thus, a power grid frequency control strategy has higher engineering application value, and the effect of power grid frequency control is optimized.

Description

A method, device, equipment and storage medium for controlling power grid frequency

[0001] This application claims priority to a domestic application filed with the Patent Office of China on January 30, 2024, with application number 202410130169.2 and invention name “A method, device, equipment and storage medium for controlling power grid frequency”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application relates to the field of power system frequency regulation, and in particular to a power grid frequency control method, device, equipment and storage medium. Background Art

[0003] Currently, power systems typically operate at their rated power frequency. A mismatch between grid generation power and load power can cause the grid frequency to fluctuate. When a power system fault occurs, the system frequency may deviate from the rated power frequency, leading to frequency instability. Frequency regulation is required to stabilize the frequency near the rated power frequency. Power systems equipped with energy storage devices can utilize this energy storage device to control the frequency and restore it to normal.

[0004] Conventional frequency modulation methods include sending emergency control commands to energy storage devices. However, these methods fail to account for the time delay between the issuance of the control command and the receipt of the command by the energy storage device for switching on and off, resulting in poor frequency modulation results.

[0005] Summary of the Invention

[0006] The present application provides a power grid frequency control method, apparatus, device and storage medium to solve the problem of poor frequency regulation effect caused by delay in command effectiveness.

[0007] In a first aspect, the present application provides a power grid frequency control method, comprising:

[0008] Sending a first active power adjustment instruction to the energy storage device according to the frequency change rate of the power grid after the frequency exceeds the limit and the first preset expected change rate, wherein the first active power adjustment instruction includes a first active power adjustment value;

[0009] Determining a target time based on the predicted adjustment duration and the instruction delay duration, and determining a second active power adjustment value based on a second preset expected rate of change, wherein the predicted adjustment duration is the predicted duration for the frequency of the power grid to reach a preset frequency value after the energy storage device executes the first active power adjustment instruction;

[0010] A second active power adjustment instruction is sent to the energy storage device at the target time, wherein the second active power adjustment instruction includes the second active power adjustment value.

[0011] In a second aspect, the present application provides a power grid frequency control device, comprising:

[0012] a first instruction sending module, configured to send a first active power adjustment instruction to the energy storage device according to a frequency change rate after the frequency of the power grid exceeds a limit and a first preset expected change rate, wherein the first active power adjustment instruction includes a first active power adjustment value;

[0013] a power adjustment value determination module, configured to determine a target time based on a predicted adjustment duration and an instruction delay duration, and to determine a second active power adjustment value based on a second preset expected rate of change, wherein the predicted adjustment duration is the predicted duration for the frequency of the power grid to reach a preset frequency value after the energy storage device executes the first active power adjustment instruction;

[0014] The second instruction sending module is configured to send a second active power adjustment instruction to the energy storage device at the target time, wherein the second active power adjustment instruction includes the second active power adjustment value.

[0015] In a third aspect, the present application provides an electronic device, comprising:

[0016] at least one processor;

[0017] and a memory communicatively coupled to the at least one processor;

[0018] The memory stores a computer program that can be executed by at least one processor, and the computer program is executed by at least one processor so that the at least one processor can execute the grid frequency control method of the first aspect.

[0019] In a fourth aspect, the present application provides a computer-readable storage medium storing computer instructions, which are used to enable a processor to implement the power grid frequency control method of the first aspect when executed.

[0020] The grid frequency control scheme provided in this application sends a first active power adjustment instruction to an energy storage device based on the frequency change rate after the grid frequency exceeds the limit and a first preset expected change rate, wherein the first active power adjustment instruction includes a first active power adjustment value, determines a target time based on the predicted adjustment duration and the instruction delay duration, and determines a second active power adjustment value based on a second preset expected change rate, wherein the predicted adjustment duration is the predicted time it takes for the grid frequency to reach the preset frequency value after the energy storage device executes the first active power adjustment instruction, and sends a second active power adjustment instruction to the energy storage device at the target time, wherein the second active power adjustment instruction includes the second active power adjustment value. By adopting the above technical solution, the issuance of the instruction and the execution time of the energy storage device are distinguished, making the grid frequency control strategy of this scheme more practical in engineering. By estimating the issuance time of the second active power adjustment instruction, the grid frequency can be maintained near the preset frequency, such as near 50 Hz, when the energy storage device executes the second active power adjustment instruction, thereby optimizing the effect of grid frequency control.

[0021] It should be understood that the content described in this section is not intended to identify the key or important features of this application, nor is it intended to limit the scope of this application. Other features of this application will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] FIG1 is a flow chart of a grid frequency control method provided according to Embodiment 1 of the present application;

[0024] FIG2 is a flow chart of a grid frequency control method provided according to a second embodiment of the present application;

[0025] FIG3 is a schematic structural diagram of a power grid frequency control device provided according to a third embodiment of the present application;

[0026] FIG4 is a schematic structural diagram of an electronic device provided according to a fourth embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the 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 in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0028] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In the description of this application, unless otherwise specified, "plurality" refers to two or more. "and / or" describes an association relationship between associated objects, indicating that three relationships can exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship. In addition, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0029] Example 1

[0030] Figure 1 is a flowchart of a grid frequency control method provided in Example 1 of the present application. This embodiment is applicable to the situation of controlling the frequency of the grid. The method can be executed by a grid frequency control device. The grid frequency control device can be implemented in the form of hardware and / or software. The grid frequency control device can be configured in an electronic device. The electronic device can be composed of two or more physical entities or one physical entity.

[0031] As shown in FIG1 , a grid frequency control method provided in the first embodiment of the present application specifically includes the following steps:

[0032] S101. Send a first active power adjustment instruction to an energy storage device based on a frequency change rate after the frequency of a power grid exceeds a frequency limit and a first preset expected change rate, wherein the first active power adjustment instruction includes a first active power adjustment value.

[0033] In this embodiment, the grid frequency can be monitored to see if it exceeds a limit. If it does, the frequency change rate can be determined. The frequency change rate and the first preset expected change rate of the grid frequency can be used to determine a first active power adjustment value, and a first active power adjustment instruction including the first active power adjustment value is sent to the energy storage device so that the grid frequency can be restored to a preset frequency value, such as the rated frequency, as soon as possible. By performing a preset operation on the frequency change rate and the first preset expected change rate, the power disturbance generated by the energy storage device at the node of the grid can be calculated, and the power disturbance is the first active power adjustment value. The upper limit of the grid frequency can be 50.03 Hz, and the lower limit can be 49.97 Hz. The first preset expected change rate can be understood as a preset expected grid frequency change rate, which can be determined based on the response of the energy storage device to historical instructions.

[0034] S102. Determine a target time based on the predicted adjustment duration and the instruction delay duration, and determine a second active power adjustment value based on a second preset expected rate of change, wherein the predicted adjustment duration is the predicted duration it takes for the frequency of the power grid to reach a preset frequency value after the energy storage device executes the first active power adjustment instruction.

[0035] In this embodiment, the instruction delay duration can be understood as the time from sending the active power adjustment instruction to the energy storage device executing the instruction. In order to ensure that the frequency of the power grid is near a preset frequency value (such as a rated frequency of 50 Hz) when the energy storage device executes the second active power adjustment instruction, it is possible to first predict the time it takes for the power grid frequency to reach the preset frequency value after the energy storage device executes the first active power adjustment instruction. Based on this time and the instruction delay duration, the sending time of the second active power adjustment instruction, i.e., the target time, can be determined. For example, if the duration is greater than the instruction delay, it indicates that at least a certain period of time is required before the second active power adjustment instruction can be sent. In this case, the target time can be the sum of the predicted adjustment duration and the time the first active power adjustment instruction is sent. If the duration is less than the instruction delay, it indicates that the time it takes for the grid frequency to reach the preset frequency value is less than the instruction delay of the second active power adjustment instruction. Therefore, before the energy storage device executes the first active power adjustment instruction, the second active power adjustment instruction should be sent. In this case, the target time can be the sum of the difference between the instruction delay and the predicted adjustment duration (less than zero) and the time the first active power adjustment instruction is executed. The second active power adjustment value can be determined based on the second preset expected rate of change. For example, by performing a set operation on the frequency change rate and the second preset expected rate of change after the energy storage device executes the first active power adjustment instruction, the power disturbance generated by the energy storage device at the node of the grid can be calculated. This power disturbance is the second active power adjustment value. The second preset expected rate of change can also be understood as the preset expected rate of change of the grid frequency.

[0036] S103: Send a second active power adjustment instruction to the energy storage device at the target time, wherein the second active power adjustment instruction includes the second active power adjustment value.

[0037] In this embodiment, a second active power adjustment instruction may be sent to the energy storage device at the target time, so that the frequency of the power grid can be stabilized at a preset frequency value.

[0038] The grid frequency control method provided in the embodiment of the present application sends a first active power adjustment instruction to the energy storage device based on the frequency change rate after the grid frequency exceeds the limit and a first preset expected change rate, wherein the first active power adjustment instruction includes a first active power adjustment value, determines a target time based on the predicted adjustment duration and the instruction delay duration, and determines a second active power adjustment value based on a second preset expected change rate, wherein the predicted adjustment duration is the predicted time it takes for the grid frequency to reach the preset frequency value after the energy storage device executes the first active power adjustment instruction, and sends a second active power adjustment instruction to the energy storage device at the target time, wherein the second active power adjustment instruction includes the second active power adjustment value. The technical solution of the embodiment of the present application distinguishes the issuance of the instruction from the execution time of the energy storage device, making the grid frequency control strategy of this solution more practical in engineering. By estimating the issuance time of the second active power adjustment instruction, when the energy storage device executes the second active power adjustment instruction, the grid frequency can be maintained near the preset frequency, such as near 50 Hz, thereby optimizing the effect of grid frequency control.

[0039] Optionally, before sending the first active power adjustment instruction to the energy storage device based on the frequency change rate after the frequency of the power grid exceeds the limit and the first preset expected change rate, the method further includes: for each generator set, determining the target energy storage device associated with the current generator set from multiple energy storage devices based on the electrical distance between the current generator set and each energy storage device; wherein, sending the first active power adjustment instruction to the energy storage device based on the frequency change rate after the frequency of the power grid exceeds the limit and the first preset expected change rate includes: sending the first active power adjustment instruction to the target energy storage device associated with each generator set based on the frequency change rate after the frequency of the power grid exceeds the limit and the first preset expected change rate of each generator set. The advantage of this setting is that, based on the electrical distance between the generator set and each energy storage device, the associated target energy storage device can be reasonably assigned to the generator set, thereby improving the efficiency of frequency regulation.

[0040] Specifically, the electrical distance between the generator set and each energy storage device can be calculated, and the energy storage device corresponding to the minimum electrical distance is determined as the energy storage device associated with the generator set, namely the target energy storage device. Each generator set can be associated with at least one energy storage device. When the grid frequency exceeds the limit, a first active power adjustment command can be sent to the target energy storage device associated with the generator set.

[0041] Optionally, the step of sending a first active power adjustment instruction to a target energy storage device associated with each generator set based on the frequency change rate of the power grid after the frequency exceeds the limit and a first preset expected change rate of each generator set includes: determining a first active power adjustment value corresponding to each generator set based on the frequency change rate of the power grid after the frequency exceeds the limit and the first preset expected change rate of each generator set, wherein the first preset expected change rate is the expected frequency change rate after the energy storage device executes the first active power adjustment instruction; if the target energy storage device is associated with multiple generator sets, determining the maximum value among the first active power adjustment values ​​corresponding to the multiple generator sets as the target first active power adjustment value; and sending a target first active power adjustment instruction to the target energy storage device associated with each generator set, wherein the target first active power adjustment instruction includes the target first active power adjustment value. The advantage of this arrangement is that by determining the maximum value among the first active power adjustment values ​​of the multiple generator sets as the target first active power adjustment value, the upward or downward trend of the power grid frequency after exceeding the limit can be quickly reversed.

[0042] Specifically, the first active power adjustment for each target energy storage device can occur at the time of a frequency overshoot. If the target energy storage device is associated with multiple generator sets, the first active power adjustment (i.e., the target first active power adjustment value) can be the maximum of the first active power adjustment values ​​of the multiple generator sets, thereby quickly reversing the upward or downward trend of the power grid frequency after the frequency overshoot.

[0043] Optionally, before sending the second active power adjustment instruction to the energy storage device at the target time, the method further includes: if the target energy storage device is associated with multiple generator sets, determining the minimum value of the second active power adjustment values ​​corresponding to the multiple generator sets as the target second active power adjustment value; wherein, sending the second active power adjustment instruction to the energy storage device at the target time includes: sending the target second active power adjustment instruction to the target energy storage device associated with each generator set at the target time, wherein the target second active power adjustment instruction includes the target second active power adjustment value. The advantage of this arrangement is that by determining the minimum value of the second active power adjustment values ​​of multiple generator sets as the target second active power adjustment value, it can be ensured to the greatest extent that larger frequency regulation negative effects such as frequency overshoot are not generated, thereby achieving rapid recovery of an actual power grid containing multiple generator sets and multiple energy storage devices under frequency disturbance conditions.

[0044] Specifically, the second active power adjustment time for each target energy storage device may be when the frequencies of the majority of the generator sets associated with that energy storage device return to the preset frequency. If the target energy storage device is associated with multiple generator sets, the minimum of the second active power adjustment values ​​of the multiple generator sets may be determined as the target second active power adjustment value, where the generator sets may be synchronous generator sets.

[0045] Optionally, before sending the first active power adjustment instruction to the energy storage device based on the frequency change rate after the frequency of the power grid exceeds the limit and the first preset expected change rate, it also includes: determining the failure risk based on the failure probability and failure economic cost of each node in the power grid, and sorting the nodes according to the failure risk to obtain a node ranking; arranging the energy storage devices according to the target node in the node ranking, wherein the target node is the node ranked in a preset position in the node ranking, and the electrical distance between the energy storage devices is greater than a preset threshold. The advantage of this setting is that it reasonably arranges the layout points of the energy storage devices, avoids the redundancy of the energy storage devices, saves economic costs, and ensures that in the case of frequency disturbance, each energy storage device can quickly restore the frequency by absorbing or generating active power.

[0046] Specifically, the failure risk can be determined by multiplying the failure probability by the economic cost of the failure. Each node in the power grid can be ranked according to failure risk, for example, from high to low failure risk. Nodes ranked in a preset position in the node ranking can be identified as target nodes, such as nodes ranked in the top 30% of the node ranking. Energy storage devices can be deployed near the target nodes. The actual number of energy storage devices can be determined based on a predetermined number of energy storage devices and a preset coefficient. For example, if no more than 10 energy storage devices are expected to be deployed in a specific power grid, the actual number of energy storage devices can be determined using a ratio of 1:1.5, i.e., 10 x 1.5 = 15. The electrical distance between each energy storage device is then determined. For pairs of energy storage devices whose electrical distance is less than or equal to a preset threshold, one device can be removed, leaving only one.

[0047] Example 2

[0048] Figure 2 is a flow chart of a grid frequency control method provided in Example 2 of the present application. The technical solution of the embodiment of the present application is further optimized on the basis of the above-mentioned optional technical solutions, and provides a specific method for controlling the frequency of the grid.

[0049] Optionally, the method of sending a first active power adjustment instruction to the energy storage device based on the frequency change rate after the power grid frequency exceeds the limit and a first preset expected change rate includes: determining a first change rate deviation based on the frequency change rate after the power grid frequency exceeds the limit and the first preset expected change rate, and determining a first disturbance power of the generator set using the first change rate deviation and the inertia time constant of the generator set; determining a first active power adjustment value using the first disturbance power and the synchronous torque coefficient of the generator set; and sending a first active power adjustment instruction including the first active power adjustment value to the energy storage device. The advantage of this arrangement is that it takes into account changes in mechanical power due to inertial response. By utilizing the inertia time constant of the generator set and the synchronous torque coefficient of the generator set, the active power required for the first adjustment at the energy storage end can be accurately determined.

[0050] Optionally, the target time is determined based on the predicted adjustment duration and the instruction delay duration, including: if the first difference between the predicted adjustment duration and the instruction delay duration is greater than zero, then the sum of the first difference and the time when the energy storage device executes the first active power adjustment instruction is determined as the target time, wherein the time when the energy storage device executes the first active power adjustment instruction is the sum of the issuance time of the first active power adjustment instruction and the instruction delay duration; if the second difference between the predicted adjustment duration and the instruction delay duration is less than or equal to zero, then the sum of the second difference and the time when the energy storage device executes the first active power adjustment instruction is determined as the target time. The advantage of this setting is that by utilizing the difference between the predicted adjustment duration and the instruction delay duration, the issuance time of the second instruction can be accurately determined.

[0051] Optionally, determining the second active power adjustment value based on the second preset expected rate of change includes: determining a second rate of change deviation based on the first preset expected rate of change and the second preset expected rate of change; determining a second disturbance power of the generator set using the second rate of change deviation and the inertia time constant of the generator set; and determining the second active power adjustment value using the second disturbance power and the synchronous torque coefficient of the generator set. This arrangement has the advantage of taking into account changes in mechanical power due to inertial response. By presetting the second preset expected rate of change, utilizing the inertia time constant of the generator set and the second preset expected rate of change, the active power required for the second adjustment at the energy storage terminal can be accurately determined.

[0052] As shown in FIG2 , a grid frequency control method provided in the second embodiment of the present application specifically includes the following steps:

[0053] S201. Determine the failure risk based on the failure probability and failure economic cost of each node in the power grid, and sort the nodes according to the failure risk to obtain a node ranking.

[0054] S202: Arrange energy storage devices according to target nodes in the node sorting.

[0055] S203 : For each generator set, determine a target energy storage device associated with the current generator set from multiple energy storage devices based on the electrical distance between the current generator set and each energy storage device.

[0056] S204: Determine a first change rate deviation based on the frequency change rate of the power grid after the frequency exceeds the limit and a first preset expected change rate, and determine a first disturbance power of the generator set using the first change rate deviation and the inertia time constant of the generator set.

[0057] S205: Determine a first active power adjustment value by using the first disturbance power and the synchronous torque coefficient of the generator set.

[0058] For example, if the generator set is a synchronous generator set, the first disturbance power ΔP e.syn.i Methods of determination include:

[0059] Among them, T J.i is the inertia time constant of synchronous generator set i, is the first preset expected rate of change, ΔP e.syn.i is the first disturbance power of the generator set, and The difference is the first rate of change deviation. e.syn.i is the predicted active power change of synchronous generator set i after applying the first active power regulation command. According to the impact power distribution, ignoring the node voltage change and network conductance, in order to make synchronous generator set i generate ΔP e.syn.i The energy storage device should generate a power disturbance of the first active power regulation value at node k. The first active power regulation value ΔP es.k Methods of determination include:

[0060] Depend on

[0061] We can get:

[0062] Among them, R ik =U k E i B li cosδ ik0 , R ik is the synchronous torque coefficient of synchronous unit i and node k; U k is the bus voltage at node k, E i is the transient internal potential of synchronous unit i, B ik is the mutual susceptance between synchronous generator set i and node k, δ ik0 is the initial angle difference between synchronous unit i and node k before the disturbance, and N is the total number of synchronous units in the system.

[0063] S206: If the target energy storage device is associated with multiple generator sets, determine the maximum value of the first active power adjustment values ​​corresponding to the multiple generator sets as the target first active power adjustment value.

[0064] S207: Send a target first active power adjustment instruction to the target energy storage device associated with each generator set.

[0065] S208: If a first difference between the predicted adjustment duration and the instruction delay duration is greater than zero, the sum of the first difference and the time for the energy storage device to execute the first active power adjustment instruction is determined as the target time.

[0066] The time for the energy storage device to execute the first active power adjustment instruction is the sum of the issuance time of the first active power adjustment instruction and the instruction delay time.

[0067] For example, if the frequency f of the power grid is lower than the preset lower limit of 49.97 and the preset frequency is 50, the predicted adjustment time t1 satisfies:

[0068] Wherein, td is the instruction delay duration of the first active power regulation instruction. If the (first) difference between the predicted regulation duration and the instruction delay duration is greater than zero, the sum of the first difference and the time for the energy storage device to execute the first active power regulation instruction is determined as the target time.

[0069] S209: If the second difference between the predicted adjustment duration and the instruction delay duration is less than or equal to zero, the sum of the second difference and the time for the energy storage device to execute the first active power adjustment instruction is determined as the target time.

[0070] Exemplarily, as described above, if the (second) difference between the predicted adjustment duration and the instruction delay duration is less than or equal to zero, the sum of the second difference and the time it takes for the energy storage device to execute the first active power adjustment instruction is determined as the target time.

[0071] S210 : Determine a second change rate deviation according to the first preset expected change rate and the second preset expected change rate.

[0072] S211 . Determine a second disturbance power of the generator set by using the second change rate deviation and the inertia time constant of the generator set.

[0073] For example, if the generator set is a synchronous generator set, the second disturbance power ΔP′ e.syn.i Methods of determination include:

[0074] in, is the second preset expected rate of change, which can be zero. and The difference is the second change rate deviation.

[0075] S212: Determine a second active power adjustment value using the second disturbance power and the synchronous torque coefficient of the generator set.

[0076] Exemplarily, the second active power adjustment value ΔP′ es.k Methods of determination include:

[0077] Among them, R ik is the synchronous torque coefficient between synchronous unit i and node k.

[0078] S213: If the target energy storage device is associated with multiple generator sets, determine the minimum value of the second active power adjustment values ​​corresponding to the multiple generator sets as the target second active power adjustment value.

[0079] S214: Send a target second active power adjustment instruction to the target energy storage device associated with each generator set at the target time.

[0080] The grid frequency control method provided in the embodiment of the present application takes into account the change in mechanical power caused by inertial response, and accurately determines the active power required to be adjusted at the energy storage end for the first time by utilizing the inertia time constant of the generator set and the synchronous torque coefficient of the generator set. By presetting a second preset expected change rate, the inertia time constant of the generator set and the second preset expected change rate are utilized to accurately determine the active power required to be adjusted at the energy storage end for the second time. Finally, by utilizing the difference between the predicted adjustment time and the instruction delay time, the issuance time of the second instruction is accurately determined.

[0081] Example 3

[0082] FIG3 is a schematic diagram of the structure of a power grid frequency control device provided in Example 3 of the present application. As shown in FIG3 , the device includes: a first instruction sending module 301, a power adjustment value determination module 302, and a second instruction sending module 303, wherein:

[0083] a first instruction sending module, configured to send a first active power adjustment instruction to the energy storage device according to a frequency change rate after the frequency of the power grid exceeds a limit and a first preset expected change rate, wherein the first active power adjustment instruction includes a first active power adjustment value;

[0084] a power adjustment value determination module, configured to determine a target time based on a predicted adjustment duration and an instruction delay duration, and to determine a second active power adjustment value based on a second preset expected rate of change, wherein the predicted adjustment duration is the predicted duration for the frequency of the power grid to reach a preset frequency value after the energy storage device executes the first active power adjustment instruction;

[0085] The second instruction sending module is configured to send a second active power adjustment instruction to the energy storage device at the target time, wherein the second active power adjustment instruction includes the second active power adjustment value.

[0086] The grid frequency control device provided in the embodiment of the present application distinguishes the issuance time of the instruction and the execution time of the energy storage device, making the grid frequency control strategy of this solution more practical in engineering. By estimating the issuance time of the second active power adjustment instruction, when the energy storage device executes the second active power adjustment instruction, the frequency of the grid can be maintained near a preset frequency, such as near 50 Hz, thereby optimizing the effect of grid frequency control.

[0087] Optionally, the first instruction sending module includes:

[0088] a first disturbance power determining unit, configured to determine a first change rate deviation based on a frequency change rate after the frequency of the power grid exceeds a limit and a first preset expected change rate, and determine a first disturbance power of the generator set using the first change rate deviation and an inertia time constant of the generator set;

[0089] a first power regulation value determining unit, configured to determine a first active power regulation value by using the first disturbance power and a synchronous torque coefficient of the generator set;

[0090] The first instruction sending unit is configured to send a first active power adjustment instruction including the first active power adjustment value to the energy storage device.

[0091] Optionally, the power adjustment value determination module includes:

[0092] a first target time determining unit, configured to determine, if a first difference between the predicted adjustment duration and the instruction delay duration is greater than zero, the sum of the first difference and the time for the energy storage device to execute the first active power adjustment instruction as the target time, wherein the time for the energy storage device to execute the first active power adjustment instruction is the sum of the issuance time of the first active power adjustment instruction and the instruction delay duration;

[0093] The second target time determination unit is used to determine the sum of the second difference and the time for the energy storage device to execute the first active power adjustment instruction as the target time if the second difference between the predicted adjustment time and the instruction delay time is less than or equal to zero.

[0094] Optionally, the power adjustment value determination module includes:

[0095] a change rate deviation determining unit, configured to determine a second change rate deviation according to the first preset expected change rate and the second preset expected change rate;

[0096] a second disturbance power determining unit, configured to determine a second disturbance power of the generator set by using the second change rate deviation and an inertia time constant of the generator set;

[0097] The second power regulation value determining unit is configured to determine a second active power regulation value by using the second disturbance power and the synchronous torque coefficient of the generator set.

[0098] Optionally, the device further includes:

[0099] The target energy storage device determination module is used to determine, for each generator set, the target energy storage device associated with the current generator set from multiple energy storage devices based on the electrical distance between the current generator set and each energy storage device before sending the first active power adjustment instruction to the energy storage device based on the frequency change rate after the frequency of the power grid exceeds the limit and the first preset expected change rate.

[0100] Optionally, the first instruction sending module is specifically used to send a first active power adjustment instruction to the target energy storage device associated with each generator set according to the frequency change rate after the frequency of the power grid exceeds the limit and the first preset expected change rate of each generator set.

[0101] Optionally, the sending of a first active power adjustment instruction to the target energy storage device associated with each of the generator sets according to the frequency change rate of the power grid after the frequency exceeds the limit and the first preset expected change rate of each of the generator sets includes: determining the first active power adjustment value corresponding to each of the generator sets according to the frequency change rate of the power grid after the frequency exceeds the limit and the first preset expected change rate of each of the generator sets, wherein the first preset expected change rate is the expected frequency change rate after the energy storage device executes the first active power adjustment instruction; if the target energy storage device is associated with multiple generator sets, determining the maximum value of the first active power adjustment values ​​corresponding to the multiple generator sets as the target first active power adjustment value; and sending a target first active power adjustment instruction to the target energy storage device associated with each of the generator sets, wherein the target first active power adjustment instruction contains the target first active power adjustment value.

[0102] Optionally, the device further includes:

[0103] The target power adjustment value determination module is used to, before sending the second active power adjustment instruction to the energy storage device at the target time, if the target energy storage device is associated with multiple generator sets, determine the minimum value of the second active power adjustment values ​​corresponding to the multiple generator sets as the target second active power adjustment value.

[0104] Optionally, the second instruction sending module is specifically configured to send a target second active power adjustment instruction to a target energy storage device associated with each of the generator sets at the target time, wherein the target second active power adjustment instruction includes the target second active power adjustment value.

[0105] Optionally, the device further includes:

[0106] a fault risk determination module configured to determine a fault risk based on a fault probability and a fault economic cost of each node in the power grid before sending a first active power adjustment instruction to the energy storage device based on a frequency change rate after the power grid frequency exceeds a limit and a first preset expected change rate, and to rank the nodes based on the fault risk to obtain a node ranking;

[0107] An energy storage device configuration module is used to arrange energy storage devices according to a target node in the node sorting, wherein the target node is a node at a preset position in the node sorting, and the electrical distance between the energy storage devices is greater than a preset threshold.

[0108] The grid frequency control device provided in the embodiments of the present application can execute the grid frequency control method provided in any embodiment of the present application, and has the corresponding functional modules and beneficial effects of the execution method.

[0109] Example 4

[0110] FIG4 shows a block diagram of an electronic device 40 that can be used to implement an embodiment of the present application. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present application described and / or required herein.

[0111] As shown in Figure 4, the electronic device 40 includes at least one processor 41 and a memory connected to the at least one processor 41, such as a read-only memory (ROM) 42, a random access memory (RAM) 43, etc., wherein the memory stores a computer program that can be executed by the at least one processor, and the processor 41 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 42 or the computer program loaded from the storage unit 48 into the random access memory (RAM) 43. Various programs and data required for the operation of the electronic device 40 can also be stored in the RAM 43. The processor 41, ROM 42 and RAM 43 are connected to each other via a bus 44. An input / output (I / O) interface 45 is also connected to the bus 44.

[0112] Multiple components in electronic device 40 are connected to I / O interface 45, including an input unit 46, such as a keyboard, mouse, etc.; an output unit 47, such as various types of displays, speakers, etc.; a storage unit 48, such as a magnetic disk, optical disk, etc.; and a communication unit 49, such as a network card, modem, wireless communication transceiver, etc. The communication unit 49 allows electronic device 40 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0113] Processor 41 can be any general-purpose and / or specialized processing component with processing and computing capabilities. Some examples of processor 41 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any other suitable processor, controller, microcontroller, etc. Processor 41 executes the various methods and processes described above, such as the grid frequency control method.

[0114] In some embodiments, the grid frequency control method can be implemented as a computer program tangibly embodied in a computer-readable storage medium, such as storage unit 48. In some embodiments, part or all of the computer program can be loaded and / or installed on electronic device 40 via ROM 42 and / or communication unit 49. When the computer program is loaded into RAM 43 and executed by processor 41, one or more steps of the grid frequency control method described above can be performed. Alternatively, in other embodiments, processor 41 can be configured to execute the grid frequency control method in any other suitable manner (e.g., via firmware).

[0115] Various embodiments of the systems and techniques described herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), system-on-chip systems (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0116] Computer programs for implementing the methods of the present application may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0117] The computer device provided above can be used to execute the grid frequency control method provided in any of the above embodiments, and has corresponding functions and beneficial effects.

[0118] Example 5

[0119] In the context of the present application, a computer-readable storage medium may be a tangible medium having computer-executable instructions for performing, when executed by a computer processor, a grid frequency control method comprising:

[0120] Sending a first active power adjustment instruction to the energy storage device according to the frequency change rate of the power grid after the frequency exceeds the limit and the first preset expected change rate, wherein the first active power adjustment instruction includes a first active power adjustment value;

[0121] Determining a target time based on the predicted adjustment duration and the instruction delay duration, and determining a second active power adjustment value based on a second preset expected rate of change, wherein the predicted adjustment duration is the predicted duration for the frequency of the power grid to reach a preset frequency value after the energy storage device executes the first active power adjustment instruction;

[0122] A second active power adjustment instruction is sent to the energy storage device at the target time, wherein the second active power adjustment instruction includes the second active power adjustment value.

[0123] In the context of the present application, a computer-readable storage medium can be a tangible medium that can contain or store a computer program for use with an instruction execution system, device or equipment or used in conjunction with an instruction execution system, device or equipment. A computer-readable storage medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium can be a machine-readable signal medium. A more specific example of a machine-readable storage medium can include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0124] The computer device provided above can be used to execute the grid frequency control method provided in any of the above embodiments, and has corresponding functions and beneficial effects.

[0125] It is worth noting that in the embodiment of the above-mentioned power grid frequency control device, the various units and modules included are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be achieved; in addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application.

[0126] Note that the above are only preferred embodiments of the present application and the technical principles employed. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present application. The scope of the present application is determined by the scope of the appended claims.

Claims

1. A method for controlling power grid frequency, characterized in that: include: Sending a first active power adjustment instruction to the energy storage device according to the frequency change rate of the power grid after the frequency exceeds the limit and the first preset expected change rate, wherein the first active power adjustment instruction includes a first active power adjustment value; Determining a target time based on the predicted adjustment duration and the instruction delay duration, and determining a second active power adjustment value based on a second preset expected rate of change, wherein the predicted adjustment duration is the predicted duration for the frequency of the power grid to reach a preset frequency value after the energy storage device executes the first active power adjustment instruction; A second active power adjustment instruction is sent to the energy storage device at the target time, wherein the second active power adjustment instruction includes the second active power adjustment value.

2. The method according to claim 1, characterized in that The sending a first active power adjustment instruction to the energy storage device according to the frequency change rate after the frequency of the power grid exceeds the limit and the first preset expected change rate includes: Determining a first rate of change deviation based on a rate of change of the frequency of the power grid after the frequency exceeds a limit and a first preset expected rate of change, and determining a first disturbance power of the generator set using the first rate of change deviation and an inertia time constant of the generator set; Determining a first active power adjustment value by using the first disturbance power and a synchronous torque coefficient of the generator set; A first active power adjustment instruction including the first active power adjustment value is sent to the energy storage device.

3. The method according to claim 1, characterized in that Determining the target time according to the predicted adjustment time and the instruction delay time includes: If the first difference between the predicted adjustment time and the instruction delay time is greater than zero, the first difference The target time is determined as the sum of the time when the energy storage device executes the first active power adjustment instruction and the time when the energy storage device executes the first active power adjustment instruction, wherein the time when the energy storage device executes the first active power adjustment instruction is the sum of the time when the first active power adjustment instruction is issued and the instruction delay time; If the second difference between the predicted adjustment duration and the instruction delay duration is less than or equal to zero, the sum of the second difference and the time for the energy storage device to execute the first active power adjustment instruction is determined as the target time.

4. The method according to claim 1, wherein The determining the second active power adjustment value according to the second preset expected change rate includes: determining a second change rate deviation according to the first preset expected change rate and the second preset expected change rate; determining a second disturbance power of the generator set by using the second rate-of-change deviation and an inertia time constant of the generator set; A second active power adjustment value is determined using the second disturbance power and the synchronous torque coefficient of the generator set.

5. The method according to any one of claims 1 to 4, characterized in that Before sending the first active power adjustment instruction to the energy storage device according to the frequency change rate after the frequency of the power grid exceeds the limit and the first preset expected change rate, the method further includes: For each generator set, determining a target energy storage device associated with the current generator set from a plurality of energy storage devices according to the electrical distance between the current generator set and each energy storage device; The step of sending a first active power adjustment instruction to the energy storage device according to the frequency change rate after the frequency of the power grid exceeds the limit and the first preset expected change rate includes: According to the frequency change rate of the power grid after the frequency exceeds the limit and the first preset expected change rate of each generator set, a first active power adjustment instruction is sent to the target energy storage device associated with each generator set.

6. The method according to claim 5, characterized in that The sending a first active power adjustment instruction to a target energy storage device associated with each of the generator sets according to the frequency change rate after the frequency of the power grid exceeds the limit and the first preset expected change rate of each of the generator sets includes: Determining a first active power adjustment value corresponding to each generator set according to a frequency change rate after the frequency of the power grid exceeds a frequency limit and a first preset expected change rate of each generator set, wherein the first preset expected change rate is an expected frequency change rate after the energy storage device executes the first active power adjustment instruction; If the target energy storage device is associated with a plurality of the generator sets, the maximum value of the first active power adjustment values corresponding to the plurality of the generator sets is determined as the target first active power adjustment value; A target first active power adjustment instruction is sent to a target energy storage device associated with each of the generator sets, wherein the target first active power adjustment instruction includes the target first active power adjustment value.

7. The method according to claim 5, characterized in that Before sending the second active power adjustment instruction to the energy storage device at the target time, the method further includes: If the target energy storage device is associated with a plurality of the generator sets, the minimum value of the second active power adjustment values corresponding to the plurality of the generator sets is determined as the target second active power adjustment value; The sending of the second active power adjustment instruction to the energy storage device at the target time includes: A target second active power adjustment instruction is sent to the target energy storage device associated with each of the generator sets at the target time, wherein the target second active power adjustment instruction includes the target second active power adjustment value.

8. The method according to claim 1, characterized in that Before sending the first active power adjustment instruction to the energy storage device according to the frequency change rate after the frequency of the power grid exceeds the limit and the first preset expected change rate, the method further includes: Determining a failure risk based on a failure probability and a failure economic cost of each node in the power grid, and ranking the nodes based on the failure risk to obtain a node ranking; Energy storage devices are arranged according to a target node in the node sorting, wherein the target node is a node at a preset position in the node sorting, and an electrical distance between the energy storage devices is greater than a preset threshold.

9. A power grid frequency control device, characterized in that: include: a first instruction sending module, configured to send a first active power adjustment instruction to the energy storage device according to a frequency change rate after the frequency of the power grid exceeds a limit and a first preset expected change rate, wherein the first active power adjustment instruction includes a first active power adjustment value; a power adjustment value determination module, configured to determine a target time based on a predicted adjustment duration and an instruction delay duration, and to determine a second active power adjustment value based on a second preset expected rate of change, wherein the predicted adjustment duration is the predicted duration for the frequency of the power grid to reach a preset frequency value after the energy storage device executes the first active power adjustment instruction; The second instruction sending module is configured to send a second active power adjustment instruction to the energy storage device at the target time, wherein the second active power adjustment instruction includes the second active power adjustment value.

10. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor. The computer program is executed by the at least one processor to enable the at least one processor to perform the grid frequency control method according to any one of claims 1 to 8.

11. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the power grid frequency control method according to any one of claims 1 to 8 when executed.

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