Frequency regulation method and apparatus, and device and storage medium

Abstract

The present application relates to a frequency regulation method and apparatus, and a device and a storage medium. In the present application, when a frequency change occurs in a certain region, regions outside a disturbance region can be promptly notified of the frequency change, and the frequency of other regions is regulated before the frequency change reaches the other regions, such that a deviation between the frequency of the other regions and the frequency of the disturbance region is within a certain range, and the other regions can promptly sense the frequency change, thereby greatly reducing the impact of the frequency change on the frequency of the other regions; and the frequency of the other regions is accurately regulated on the basis of a power adjustment amount, thereby maintaining the frequency stability of each region of a power system and the entire power system.

Description

Frequency modulation methods, devices, equipment and storage media

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411444313.6, filed on October 16, 2024, entitled “Frequency Control Method, Apparatus, Device and Storage Medium”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of power grid control technology, and in particular to a frequency control method, device, equipment and storage medium. Background Technology

[0004] In the operation and maintenance of modern power systems, ensuring the stability and safety of the system is a crucial task. Load frequency control (LFC) can maintain the frequency of the power system within a predetermined range to cope with the challenges brought about by load changes.

[0005] However, existing load frequency control strategies neglect the wave propagation effect of frequency changes in multi-zone systems, resulting in time delays in frequency response across different zones. When a disturbance zone with significant frequency changes occurs in multiple zones, the frequency changes in the disturbance zone propagate to other zones. Power adjustment equipment in other zones outside the disturbance zone struggles to detect these frequency changes in time, only adjusting power after the frequency change has occurred. This causes frequency disturbances in other zones as well, affecting frequency stability in those zones. Summary of the Invention

[0006] To address the aforementioned technical problems, this application provides a frequency regulation method, apparatus, device, and storage medium.

[0007] The first aspect of this application provides a frequency modulation method, comprising:

[0008] Obtain the frequency of each region within the power system;

[0009] Calculate the deviation between the frequency of each region and the standard frequency;

[0010] The region with a deviation greater than the first preset threshold is defined as the disturbance region;

[0011] For each target region outside the disturbance region, calculate the target deviation between the frequency of the target region and the frequency of the disturbance region;

[0012] When the target deviation is greater than the second preset threshold, the total power optimization coefficient corresponding to the target region is obtained;

[0013] Based on the target deviation and the total power optimization coefficient, determine the power adjustment amount for the target region;

[0014] The power adjustment device outputs a power adjustment amount corresponding to the target power in the target area, so as to adjust the target deviation between the frequency of the target area and the frequency of the disturbance area to within the second preset threshold based on the target power.

[0015] A second aspect of this application provides a frequency control device, comprising:

[0016] The first acquisition module is used to acquire the frequency of each region within the power system;

[0017] The first calculation module is used to calculate the deviation between the frequency of each region and the standard frequency.

[0018] The first determining module is used to determine the region where the deviation is greater than the first preset threshold as the disturbance region;

[0019] The second calculation module is used to calculate the target deviation between the frequency of the target area and the frequency of the disturbance area for each target area outside the disturbance area;

[0020] The second acquisition module is used to acquire the total power optimization coefficient corresponding to the target area when the target deviation is greater than the second preset threshold.

[0021] The second determining module is used to determine the power adjustment amount for the target region based on the target deviation and the total power optimization coefficient;

[0022] The control module is used to control the output power adjustment amount of the power adjustment device in the target area to correspond to the target power, so as to adjust the target deviation between the frequency of the target area and the frequency of the disturbance area to within the second preset threshold based on the target power.

[0023] A third aspect of this application provides a computer device including a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the frequency control method of the first aspect described above can be implemented.

[0024] The fourth aspect of this application provides a computer-readable storage medium storing a computer program that, when executed by a processor, can implement the frequency control method of the first aspect described above.

[0025] The technical solution provided in this application has the following advantages compared with the prior art:

[0026] This application obtains the frequencies of various regions within a power system; calculates the deviation between the frequency of each region and the standard frequency; identifies regions with deviations greater than a first preset threshold as disturbance regions; for each target region outside the disturbance regions, calculates the target deviation between the frequency of the target region and the frequency of the disturbance region; when the target deviation exceeds a second preset threshold, obtains the total power optimization coefficient corresponding to the target region; determines the power adjustment amount for the target region based on the target deviation and the total power optimization coefficient; and controls the output power of the power adjustment equipment in the target region to output the target power corresponding to the power adjustment amount, thereby adjusting the target deviation between the frequency of the target region and the frequency of the disturbance region to within the second preset threshold based on the target power. This application can promptly notify other regions outside the disturbance region of the frequency change when a frequency change occurs in a certain region, regulating the frequency of other regions before the frequency change reaches them, keeping the deviation between the frequency of other regions and the frequency of the disturbance region within a certain range. This allows other regions to promptly perceive frequency changes, greatly reducing the impact of frequency changes on their frequencies. Based on the power adjustment amount, it accurately regulates the frequency of other regions, maintaining the frequency stability of each region and the entire power system. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0028] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 is a flowchart of a frequency control method provided in an embodiment of this application;

[0030] Figure 2 is a flowchart of a method for determining the total power optimization coefficient provided in an embodiment of this application;

[0031] Figure 3 is a flowchart of a power adjustment method provided in an embodiment of this application;

[0032] Figure 4 is a flowchart of a control mode switching method provided in an embodiment of this application;

[0033] Figure 5 is a schematic diagram of a frequency control device provided in an embodiment of this application;

[0034] Figure 6 is a schematic diagram of the structure of a computer device provided in an embodiment of this application. Detailed Implementation

[0035] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0036] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0037] It should be understood that the steps described in the method embodiments of this application may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of this application is not limited in this respect.

[0038] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0039] It should be noted that the terms "a" and "a plurality of" used in this application are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0040] The frequency control method provided in this application embodiment can be executed by a computer device. The device can be understood as any device with processing and computing capabilities. The device can include, but is not limited to, mobile terminals such as smartphones, laptops, and tablet computers, as well as fixed electronic devices such as digital TVs and desktop computers.

[0041] To better understand the inventive concept of the embodiments of this application, the technical solutions of the embodiments of this application will be described below in conjunction with exemplary embodiments.

[0042] Figure 1 is a flowchart of a frequency control method provided in an embodiment of this application. This method can be executed by a computer device, which can be understood as any device with computing and processing capabilities. As shown in Figure 1, the frequency control method provided in this embodiment includes the following steps:

[0043] Step 110: Obtain the frequency of each region within the power system.

[0044] In this embodiment of the application, the power system may include multiple areas, each of which contains a generator and a battery energy storage system (BESS).

[0045] Computer equipment can acquire frequencies for different areas within a power system.

[0046] In some embodiments, obtaining the frequency of each region within the power system may include steps 1101-1103:

[0047] Step 1101: For each region, obtain the voltage of each key node in that region.

[0048] In this embodiment, a region may include multiple key nodes, such as substations, power regulation equipment, and load centers. These nodes are interconnected via power lines to jointly maintain the power supply and grid stability of the entire region. A phasor measurement unit (PMU) can be deployed at each key node in the region. The phasor measurement unit can collect the voltage and current of the key nodes.

[0049] For each region, the computer equipment can obtain the voltage of each key node in that region through the phasor measurement unit.

[0050] Step 1102: For each critical node in the region, calculate the frequency value of the critical node based on its voltage.

[0051] In this embodiment of the application, for each key node in the region, the computer device can extract the voltage phase angle from the voltage of the key node and calculate the frequency value of the key node based on the time change rate of the voltage phase angle.

[0052] Specifically, it can be calculated using equation (1):

[0053] Among them, V y (t) represents the voltage at the critical node y, and t represents time.

[0054] Step 1103: Calculate the weighted average of the frequency values ​​of all key nodes in the region to obtain the frequency of the region.

[0055] In this embodiment of the application, the computer device can obtain the weight value corresponding to the frequency value of each key node in the region, and then calculate the weighted average of the frequency values ​​of all key nodes in the region to obtain the frequency of the region.

[0056] Step 120: Calculate the deviation between the frequency of each region and the standard frequency.

[0057] In this embodiment of the application, the computer device can calculate the deviation between the frequency of each region in the power system and the standard frequency.

[0058] Step 130: Determine the region with a deviation greater than the first preset threshold as the disturbance region.

[0059] In this embodiment of the application, if the deviation between the frequency of a region and the standard frequency is greater than a first preset threshold, the computer device can determine the region as a disturbance region.

[0060] The first preset threshold can be set as needed, and is not limited here.

[0061] Step 140: For each target region outside the disturbance region, calculate the target deviation between the frequency of the target region and the frequency of the disturbance region.

[0062] Step 150: When the target deviation is greater than the second preset threshold, obtain the total power optimization coefficient corresponding to the target area.

[0063] In this embodiment of the application, when the target deviation between the frequency of the target region and the frequency of the disturbance region is less than or equal to the second preset threshold, the computer device can determine that the target region is a region that does not require frequency regulation; when the target deviation between the frequency of the target region and the frequency of the disturbance region is greater than the second preset threshold, the computer device can determine that the target region is a region that requires frequency regulation, and then obtain the total power optimization coefficient corresponding to the target region.

[0064] The second preset threshold can be set as needed, and is not limited here.

[0065] Step 160: Multiply the target deviation by the total power optimization coefficient to obtain the power adjustment amount for the target region.

[0066] Step 170: Control the power adjustment device of the target area to output the target power corresponding to the power adjustment amount, so as to adjust the target deviation between the frequency of the target area and the frequency of the disturbance area to within the second preset threshold based on the target power.

[0067] In this embodiment of the application, the computer device can accurately control the power adjustment device of the target area to output the target power corresponding to the power adjustment amount. After the target area receives the target power, the frequency of the target area changes immediately. At this time, based on the target power, the target deviation between the frequency of the target area and the frequency of the disturbance area will be adjusted to within the second preset threshold, that is, the target deviation is less than or equal to the second preset threshold.

[0068] This application embodiment acquires the frequencies of various regions within a power system; calculates the deviation between the frequency of each region and the standard frequency; identifies regions with deviations greater than a first preset threshold as disturbance regions; for each target region outside the disturbance regions, calculates the target deviation between the frequency of the target region and the frequency of the disturbance region; when the target deviation exceeds a second preset threshold, acquires the total power optimization coefficient corresponding to the target region; determines the power adjustment amount for the target region based on the target deviation and the total power optimization coefficient; and controls the power adjustment device in the target region to output the target power corresponding to the power adjustment amount, thereby adjusting the target deviation between the frequency of the target region and the frequency of the disturbance region to within the second preset threshold based on the target power. This application can promptly notify other regions outside the disturbance region of the frequency change when a frequency change occurs in a certain region, regulating the frequency of other regions before the frequency change reaches them, keeping the deviation between the frequency of other regions and the frequency of the disturbance region within a certain range. This allows other regions to promptly perceive frequency changes, greatly reducing the impact of frequency changes on the frequencies of other regions, and accurately regulating the frequencies of other regions based on the power adjustment amount, maintaining the frequency stability of each region and the entire power system.

[0069] In some embodiments of this application, the above-mentioned method for obtaining the total power optimization coefficient corresponding to the target region can be achieved by a computer device executing a flowchart of a method for determining the total power optimization coefficient provided in FIG2. As shown in FIG2, the method for determining the total power optimization coefficient provided in this embodiment may include the following steps:

[0070] Step 210: Obtain the response time constant of the power adjustment device in the current target area, the transmission delay time constant of the tie line from the target area to the disturbance area, and the maximum output power of the power adjustment device in the target area.

[0071] In this embodiment, the response time constant of the power regulation device describes the time required for the power regulation device (such as a generator set or energy storage system) to respond to a frequency deviation command and reach a new steady-state power output. It reflects the dynamic response capability and speed of the power regulation device in frequency control. It can generally be obtained from parameters provided by the power regulation device manufacturer.

[0072] The transmission delay time constant of the tie line between the target area and the disturbance area can compensate for the frequency variation caused by the propagation delay due to wave propagation effects. Thus, even in areas with significant physical distances, the impact of frequency disturbances can be mitigated by adjusting the control strategy in advance, thereby improving system response speed and stability.

[0073] The maximum output power of the power adjustment equipment in the target area can be understood as the maximum output power that the generator and battery energy storage system in the target area can currently provide.

[0074] In this embodiment of the application, the computer device can obtain the response time constant of the power adjustment device in the current target area, the transmission delay time constant of the tie line from the target area to the disturbance area, and the maximum output power of the power adjustment device in the target area.

[0075] Step 220: Based on the mapping relationship between at least one of the parameters, namely response time constant, tie line transmission delay time constant, and maximum output power, and the power optimization coefficient, determine the total power optimization coefficient corresponding to the target area.

[0076] In this embodiment of the application, the computer device pre-stores a first mapping relationship between the response time constant of the power adjustment device and the power optimization coefficient, a second mapping relationship between the transmission delay time constant of the tie line and the power optimization coefficient, and a third mapping relationship between the maximum output power of the power adjustment device and the power optimization coefficient.

[0077] The computer equipment can determine the total power optimization coefficient corresponding to the target area based on the mapping relationship between at least one of the following parameters: the response time constant of the power adjustment device in the target area, the transmission delay time constant of the tie line from the target area to the disturbance area, and the maximum output power of the power adjustment device in the target area, and the power optimization coefficient.

[0078] In some embodiments, determining the total power optimization coefficient corresponding to the target region based on the mapping relationship between at least one parameter among the response time constant, tie-line transmission delay time constant, and maximum output power and the power optimization coefficient may include steps 2201-2203:

[0079] Step 2201: Based on the first mapping relationship between the response time constant and the power optimization coefficient, determine the first power optimization sub-coefficient corresponding to the response time constant of the power adjustment device in the target area. The first mapping relationship includes a negative correlation between the response time constant and the power optimization coefficient.

[0080] In this embodiment of the application, the first mapping relationship may include a negative correlation between the response time constant of the power adjustment device and the power optimization coefficient. The smaller the response time constant, the larger the corresponding power optimization coefficient.

[0081] Specifically, the first power optimization sub-coefficient k1 corresponding to the response time constant of the power adjustment device in the target area can be determined by equation (2):

[0082] Among them, T response This represents the response time constant of the power adjustment device in the target area;

[0083] 'a' is a scaling factor. The value of 'a' typically depends on the base power of the power system in the target area, the target frequency regulation intensity, and the regulation objective. For example, when a strong response capability is desired in frequency regulation, 'a' can be set to a larger value. The value of 'a' can also be calibrated based on the characteristics and power level of the power system, as well as actual operating experience and historical data, to ensure that the frequency regulation strategy can meet the dynamic response requirements of the power system.

[0084] b is an exponential factor that can be used to represent the coefficients of the first power optimizer with respect to the response time constant T. response The sensitivity of the first power optimizer coefficients to changes in the response time constant is as follows: A larger value of b indicates that the first power optimizer coefficients are more sensitive to changes in the response time constant. A smaller value of b indicates that the first power optimizer coefficients are less sensitive to changes in the response time constant.

[0085] Step 2202: Based on the second mapping relationship between tie-line transmission delay time constant and power optimization coefficient, determine the second power optimization sub-coefficient corresponding to the tie-line transmission delay time constant from the target area to the disturbance area. The second mapping relationship includes a positive correlation between the tie-line transmission delay time constant and the power optimization coefficient.

[0086] In this embodiment, the second mapping relationship may include a positive correlation between the tie-line transmission delay time constant from the target region to the disturbance region and the power optimization coefficient. The longer the tie-line transmission delay time constant, the larger the corresponding power optimization coefficient.

[0087] Specifically, the second power optimization sub-coefficient k2 corresponding to the transmission delay time constant of the tie line from the target area to the disturbance area can be determined by equation (3):

[0088] Among them, T line The time constant representing the transmission delay of the tie line from the target area to the disturbance area is usually related to the length of the tie line, the electrical characteristics of the conductor (such as resistance and inductance), and the load conditions.

[0089] c is a scaling factor used to adjust the value of the second power optimization sub-coefficient k2. The value of c is usually set based on the power system's control objectives and actual operating experience, and can also be calibrated through historical data and simulation analysis to ensure that the frequency control effect remains stable under different tie-line transmission characteristics.

[0090] d is an exponential factor used to represent the sensitivity of the second power optimizer coefficient k2 to the tie-line transmission delay time constant. The larger the value of d, the more sensitive the second power optimizer coefficient k2 is to the tie-line transmission delay time constant; the smaller the value of d, the less sensitive the second power optimizer coefficient k2 is to the tie-line transmission delay time constant.

[0091] Step 2203: Based on the third mapping relationship between the maximum output power and the power optimization coefficient, determine the third power optimization sub-coefficient corresponding to the maximum output power of the power adjustment device in the target area. The third mapping relationship includes the logarithmic relationship between the maximum output power and the power optimization coefficient.

[0092] In this embodiment of the application, the third mapping relationship may include a logarithmic relationship between the maximum output power of the power adjustment device and the power optimization coefficient.

[0093] Specifically, the third power optimization sub-coefficient k3 corresponding to the maximum output power of the power adjustment device in the target area can be determined by equation (4): k3=e log(P max +f) (4)

[0094] Among them, P max This indicates the maximum output power of the power adjustment device in the target area;

[0095] f is an offset (or shift) used to adjust the maximum output power, ensuring that the control of the third power optimization coefficient k3 remains reasonable and stable under different maximum output power conditions. When the value of f is large, it means that even when the maximum output power is small, the third power optimization coefficient k3 can still maintain a large value, thereby increasing the control intensity; when the value of f is small, it means that the power system is more sensitive to small changes in the maximum output power, thereby improving the response to small power regulation capabilities.

[0096] Step 2204: Perform a weighted summation of at least one of the first power optimization sub-coefficient, the second power optimization sub-coefficient, and the third power optimization sub-coefficient to obtain the total power optimization coefficient corresponding to the target region.

[0097] In some embodiments, the weighted summation of at least one of the first power optimization sub-coefficients, the second power optimization sub-coefficients, and the third power optimization sub-coefficients to obtain the total power optimization coefficients corresponding to the target region may include S11-S13:

[0098] S11. Obtain the first weight factor corresponding to the first power optimization sub-coefficient, the second weight factor corresponding to the second power optimization sub-coefficient, and the third weight factor corresponding to the maximum output power.

[0099] The first, second, and third weighting factors can be determined based on system analysis and actual operational experience to ensure that the relative importance of each factor in the overall frequency adjustment is reasonably reflected.

[0100] S12. Calculate the first product of the first power optimization sub-coefficient and the first weight factor, the second product of the second power optimization sub-coefficient and the second weight factor, and the third product of the third power optimization sub-coefficient and the third weight factor.

[0101] S13. Sum the first product, the second product, and the third product to obtain the total power optimization coefficients corresponding to the target region.

[0102] Specifically, the total power optimization coefficient k corresponding to the target region can be calculated using equation (5): k = w1k1 + w2k2 + w3k3 (5)

[0103] Where w1 represents the first weighting factor corresponding to the first power optimizer coefficient k1;

[0104] w2 represents the second weighting factor corresponding to the second power optimizer coefficient k2;

[0105] w3 represents the third weighting factor corresponding to the third power optimizer coefficient k3.

[0106] Therefore, the overall power optimization coefficient for the target area can be determined based on at least one of the following parameters: the response time constant of the power adjustment equipment in the target area, the transmission delay time constant of the tie line from the target area to the disturbance area, and the maximum output power of the power adjustment equipment in the target area. By combining the influence of at least one of the following factors on the regional power adjustment, the accuracy of the power adjustment amount can be improved. In turn, the frequency of other areas can be accurately controlled based on the power adjustment amount, thereby maintaining the frequency stability of each area of ​​the power system and the entire power system.

[0107] In some embodiments of this application, the power adjustment device of the control target area outputs a target power corresponding to the power adjustment amount. The computer device can execute a flowchart of a power adjustment method provided in FIG3. As shown in FIG3, the power adjustment method provided in this embodiment may include the following steps:

[0108] Step 310: Obtain the maximum output power of the battery energy storage system in the current target area. If the maximum power is greater than or equal to the power adjustment amount, proceed to step 320; if the maximum power is less than the power adjustment amount, proceed to steps 330-350.

[0109] Step 320: When the maximum power is greater than or equal to the power adjustment amount, control the battery energy storage system in the target area to output the target power corresponding to the power adjustment amount.

[0110] In this embodiment of the application, when the maximum output power of the battery energy storage system is greater than or equal to the power adjustment amount, it indicates that the power adjustment amount can be met by the battery energy storage system alone, and the computer equipment can control the output power of the battery energy storage system in the target area to correspond to the power adjustment amount.

[0111] Step 330: When the maximum power is less than the power adjustment amount, control the battery energy storage system to output the maximum power.

[0112] In this embodiment of the application, when the maximum output power of the battery energy storage system is less than the power adjustment amount, it indicates that the battery energy storage system alone cannot meet the power adjustment amount, and the computer equipment can control the battery energy storage system in the target area to output the maximum power.

[0113] Step 340: Calculate the difference between the power adjustment amount and the maximum power to obtain the remaining adjustment power.

[0114] Step 350: Control the generator output of the target area to adjust the remaining power.

[0115] This allows for the coordination of regional battery energy storage systems and generators to adjust the regional output power to meet the required power adjustment amount, improve the utilization efficiency of energy storage resources, and then accurately regulate the frequency of other regions based on the power adjustment amount, thereby maintaining the frequency stability of each region of the power system and the entire power system.

[0116] In some embodiments of this application, after the power adjustment device of the control target area outputs a target power corresponding to the target power adjustment amount, and adjusts the target deviation between the frequency of the target area and the frequency of the disturbance area to within a second preset threshold based on the target power, the computer device can execute a flowchart of a control mode switching method provided in FIG4. As shown in FIG4, the control mode switching method provided in this embodiment may include the following steps:

[0117] Step 410: When the target deviation between the frequency of each target area and the frequency of the disturbance area is less than or equal to the second preset threshold, count the duration during which the target deviation is less than or equal to the second preset threshold.

[0118] Step 420: When the duration exceeds the preset duration threshold, determine that the frequency of the power system to which each target area belongs is in a stable state.

[0119] In this embodiment of the application, when the duration of each target deviation is less than or equal to the second preset threshold is greater than the preset duration threshold, the computer device can determine that the frequency of the power system to which each target area belongs is in a stable state.

[0120] The preset duration threshold can be set as needed; there is no limitation here.

[0121] Step 430: Switch the current frequency control mode of the power system to the preset control mode.

[0122] In this embodiment, the preset control mode can be a single-frequency control (PFC) mode or other frequency control modes, which are not limited here.

[0123] The current frequency control mode is the enhanced control mode. After determining that the frequency of the power system in each target area is in a stable state, the computer equipment can switch the current frequency control mode of the power system to the preset control mode.

[0124] Optionally, the computer equipment can smoothly switch the current frequency control mode of the power system to a preset control mode. That is, as time goes by, the influence of the enhanced control mode gradually weakens, while the influence of the preset control mode gradually strengthens, which can reduce the risk of system oscillation during the frequency control strategy transition.

[0125] Therefore, after the frequency of the power system in each target area has stabilized, the current frequency control mode of the power system can be switched to the preset control mode in a timely manner, ensuring that the power system can seamlessly connect with the conventional control strategy after the frequency recovers and improving the flexibility of frequency control.

[0126] Figure 5 is a schematic diagram of a frequency control device provided in an embodiment of this application. This device can be understood as the aforementioned computer equipment or a functional module within the aforementioned computer equipment. As shown in Figure 5, the frequency control device 500 includes:

[0127] The first acquisition module 510 is used to acquire the frequency of each region within the power system;

[0128] The first calculation module 520 is used to calculate the deviation between the frequency of each region and the standard frequency;

[0129] The first determining module 530 is used to determine the region where the deviation is greater than a first preset threshold as a disturbance region;

[0130] The second calculation module 540 is used to calculate the target deviation between the frequency of the target region and the frequency of the disturbance region for each target region outside the disturbance region;

[0131] The second acquisition module 550 is used to acquire the total power optimization coefficient corresponding to the target region when the target deviation is greater than the second preset threshold.

[0132] The second determining module 560 is used to determine the power adjustment amount of the target region based on the target deviation and the total power optimization coefficient;

[0133] The control module 570 is used to control the power adjustment device of the target area to output the target power corresponding to the power adjustment amount, so as to adjust the target deviation between the frequency of the target area and the frequency of the disturbance area to within the second preset threshold based on the target power.

[0134] Optionally, the first acquisition module mentioned above includes:

[0135] The first acquisition submodule is used to acquire the voltage of each key node in the current region for each region;

[0136] The first calculation submodule is used to calculate the frequency value of each key node in the region based on the voltage of the key node;

[0137] The second calculation submodule is used to calculate the weighted average of the frequency values ​​of all key nodes in the region to obtain the frequency of the region.

[0138] Optionally, the second acquisition module mentioned above includes:

[0139] The second acquisition submodule is used to acquire the response time constant of the power adjustment device in the current target area, the tie-line transmission delay time constant from the target area to the disturbance area, and the maximum output power of the power adjustment device in the target area.

[0140] The first determining submodule is used to determine the total power optimization coefficient corresponding to the target region based on the mapping relationship between at least one of the parameters, namely the response time constant, the tie-line transmission delay time constant, and the maximum output power, and the power optimization coefficient.

[0141] Optionally, the first determining submodule mentioned above includes:

[0142] The first determining unit is configured to determine the first power optimization sub-coefficient corresponding to the response time constant based on the first mapping relationship between the response time constant and the power optimization coefficient, wherein the first mapping relationship includes a negative correlation between the response time constant and the power optimization coefficient;

[0143] The second determining unit is used to determine the second power optimization sub-coefficient corresponding to the tie-line transmission delay time constant based on the second mapping relationship between the tie-line transmission delay time constant and the power optimization coefficient. The second mapping relationship includes a positive correlation between the tie-line transmission delay time constant and the power optimization coefficient.

[0144] The third determining unit is used to determine the third power optimization sub-coefficient corresponding to the maximum output power based on the third mapping relationship between the maximum output power and the power optimization coefficient, wherein the third mapping relationship includes a logarithmic relationship between the maximum output power and the power optimization coefficient;

[0145] The summation unit is used to perform a weighted summation of at least one of the first power optimization sub-coefficients, the second power optimization sub-coefficients, and the third power optimization sub-coefficients to obtain the total power optimization coefficients corresponding to the target region.

[0146] Optionally, the above summation unit includes:

[0147] A sub-unit is used to acquire the first weighting factor corresponding to the first power optimization sub-coefficient, the second weighting factor corresponding to the second power optimization sub-coefficient, and the third weighting factor corresponding to the maximum output power.

[0148] The calculation subunit is used to calculate the first product of the first power optimization sub-coefficient and the first weight factor, the second product of the second power optimization sub-coefficient and the second weight factor, and the third product of the third power optimization sub-coefficient and the third weight factor.

[0149] The summation subunit is used to sum the first product, the second product, and the third product to obtain the total power optimization coefficient corresponding to the target region.

[0150] Optionally, the above control module includes:

[0151] The third acquisition submodule is used to acquire the maximum output power of the battery energy storage system in the target area.

[0152] The first control submodule is used to control the battery energy storage system in the target area to output the target power corresponding to the power adjustment amount when the maximum power is greater than or equal to the power adjustment amount.

[0153] The second control submodule is used to control the battery energy storage system to output the maximum power when the maximum power is less than the power adjustment amount;

[0154] The third calculation submodule is used to calculate the difference between the power adjustment amount and the maximum power to obtain the remaining adjustment power;

[0155] The third control submodule is used to control the generator in the target area to output the remaining adjusted power.

[0156] Optionally, the frequency control device mentioned above includes:

[0157] The statistics module is used to count the duration during which the target deviations between the frequencies of each target region and the frequencies of the disturbance region are all less than or equal to the second preset threshold.

[0158] The third determining module is used to determine that the power system of each target area is in a stable state when the duration exceeds a preset duration threshold.

[0159] The switching module is used to switch the current frequency control mode of the power system to a preset control mode.

[0160] The frequency control device provided in this application can implement the method of any of the above embodiments, and its execution mode and beneficial effects are similar, so they will not be described again here.

[0161] This application also provides a computer device, which includes a processor and a memory. The memory stores a computer program. When the computer program is executed by the processor, it can implement the methods of any of the above embodiments. The execution method and beneficial effects are similar, and will not be described again here.

[0162] Figure 6 is a schematic diagram of the structure of a computer device provided in an embodiment of this application. As shown in Figure 6, the computer device 600 may include a processor 610 and a memory 620. The memory 620 stores a computer program 621. When the computer program 621 is executed by the processor 610, it can implement the method provided in any of the above embodiments. The execution mode and beneficial effects are similar and will not be described again here.

[0163] Of course, for simplicity, Figure 6 only shows some of the components of the computer device 600 relevant to this application, omitting components such as buses, input / output interfaces, input devices, and output devices. In addition, the computer device 600 may include any other suitable components depending on the specific application.

[0164] This application provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it can implement the methods of any of the above embodiments. The execution method and beneficial effects are similar, and will not be described again here.

[0165] The aforementioned computer-readable storage medium may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may, for example, include, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: electrical connections having one or more wires, portable disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0166] The computer program described above can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of this application. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computer device, partially on the user's device, as a standalone software package, partially on the user's computer device and partially on a remote computer device, or entirely on a remote computer device or server.

[0167] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of disclosure in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

[0168] Furthermore, while the operations are described in a specific order, this should not be construed as requiring these operations to be performed in the specific order shown or in a sequential order. Multitasking and parallel processing may be advantageous in certain environments. Similarly, while several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of this application. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented individually or in any suitable sub-combination in multiple embodiments.

[0169] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A frequency modulation method, characterized in that, include: Obtain the frequency of each region within the power system; Calculate the deviation between the frequency of each region and the standard frequency; The region where the deviation is greater than a first preset threshold is defined as the disturbance region; For each target region outside the disturbance region, calculate the target deviation between the frequency of the target region and the frequency of the disturbance region; When the target deviation is greater than the second preset threshold, the total power optimization coefficient corresponding to the target region is obtained; Based on the target deviation and the total power optimization coefficient, the power adjustment amount for the target region is determined; The power adjustment device in the target area is controlled to output the target power corresponding to the power adjustment amount, so as to adjust the target deviation between the frequency of the target area and the frequency of the disturbance area to within the second preset threshold based on the target power.

2. The method according to claim 1, characterized in that, The acquisition of frequencies in various regions within the power system includes: For each region, obtain the voltage of each key node in the current region; For each of the key nodes in the region, the frequency value of the key node is calculated based on the voltage of the key node; The frequency of the region is obtained by calculating the weighted average of the frequency values ​​of all key nodes in the region.

3. The method according to claim 1, characterized in that, The step of obtaining the total power optimization coefficient corresponding to the target region includes: Obtain the response time constant of the power adjustment device in the target area, the tie-line transmission delay time constant from the target area to the disturbance area, and the maximum output power of the power adjustment device in the target area; Based on the mapping relationship between at least one of the parameters—the response time constant, the tie-line transmission delay time constant, and the maximum output power—and the power optimization coefficient, the total power optimization coefficient corresponding to the target region is determined.

4. The method according to claim 3, characterized in that, The determination of the total power optimization coefficient corresponding to the target region based on the mapping relationship between at least one of the parameters—the response time constant, the tie-line transmission delay time constant, and the maximum output power—and the power optimization coefficient includes: Based on the first mapping relationship between the response time constant and the power optimization coefficient, a first power optimization sub-coefficient corresponding to the response time constant is determined, wherein the first mapping relationship includes a negative correlation between the response time constant and the power optimization coefficient. Based on the second mapping relationship between the tie-line transmission delay time constant and the power optimization coefficient, a second power optimization sub-coefficient corresponding to the tie-line transmission delay time constant is determined. The second mapping relationship includes a positive correlation between the tie-line transmission delay time constant and the power optimization coefficient. Based on the third mapping relationship between the maximum output power and the power optimization coefficient, the third power optimization sub-coefficient corresponding to the maximum output power is determined. The third mapping relationship includes the logarithmic relationship between the maximum output power and the power optimization coefficient. The power optimization sub-coefficients of the first power optimization sub-coefficient, the second power optimization sub-coefficient, and the third power optimization sub-coefficient are weighted and summed to obtain the total power optimization coefficients corresponding to the target region.

5. The method according to claim 4, characterized in that, The step of weighted summing of at least one of the first power optimization sub-coefficients, the second power optimization sub-coefficients, and the third power optimization sub-coefficients to obtain the total power optimization coefficients corresponding to the target region includes: Obtain the first weighting factor corresponding to the first power optimization sub-coefficient, the second weighting factor corresponding to the second power optimization sub-coefficient, and the third weighting factor corresponding to the maximum output power; Calculate the first product of the first power optimization sub-coefficient and the first weight factor, the second product of the second power optimization sub-coefficient and the second weight factor, and the third product of the third power optimization sub-coefficient and the third weight factor; The first product, the second product, and the third product are summed to obtain the total power optimization coefficient corresponding to the target region.

6. The method according to claim 1, characterized in that, The power adjustment device controlling the target area outputs the target power corresponding to the power adjustment amount, including: Obtain the maximum output power of the battery energy storage system in the target area; When the maximum power is greater than or equal to the power adjustment amount, the battery energy storage system in the target area is controlled to output the target power corresponding to the power adjustment amount; When the maximum power is less than the power adjustment amount, the battery energy storage system is controlled to output the maximum power; Calculate the difference between the power adjustment amount and the maximum power to obtain the remaining adjustment power; Control the generator in the target area to output the remaining adjusted power.

7. The method according to claim 1, characterized in that, After the power adjustment device controlling the target area outputs the target power corresponding to the power adjustment amount, the method further includes: When the target deviation between the frequency of each target region and the frequency of the disturbance region is less than or equal to the second preset threshold, the duration for which each target deviation is less than or equal to the second preset threshold is counted. When the duration exceeds a preset duration threshold, it is determined that the power system of each target area is in a stable state; Switch the current frequency control mode of the power system to the preset control mode.

8. A frequency control device, characterized in that, include: The first acquisition module is used to acquire the frequency of each region within the power system; The first calculation module is used to calculate the deviation between the frequency of each region and the standard frequency; The first determining module is used to determine the region where the deviation is greater than a first preset threshold as the disturbance region; The second calculation module is used to calculate the target deviation between the frequency of the target region and the frequency of the disturbance region for each target region outside the disturbance region; The second acquisition module is used to acquire the total power optimization coefficient corresponding to the target region when the target deviation is greater than the second preset threshold. The second determining module is used to determine the power adjustment amount of the target region based on the target deviation and the total power optimization coefficient; The control module is used to control the power adjustment device of the target area to output the target power corresponding to the power adjustment amount, so as to adjust the target deviation between the frequency of the target area and the frequency of the disturbance area to within the second preset threshold based on the target power.

9. A computer device, characterized in that, include: A memory and a processor, wherein the memory stores a computer program that, when executed by the processor, implements the frequency control method as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, which, when executed by a processor, implements the frequency control method as described in any one of claims 1-7.

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