A wind power primary frequency modulation pre-action control method and device and medium

Abstract

The application discloses a wind power primary frequency modulation pre-action control method and device and medium, and relates to the field of wind power generation. The voltage of a PT and the current of a CT of a power generation station are acquired to determine the frequency of a grid connection point, and the frequency change rate of each time detection point within a first preset time is acquired. It is judged whether the absolute value of the frequency change rate of each time detection point within the first preset time is greater than a first threshold value and the frequency is within a first preset range. If yes, a primary frequency modulation load control instruction is sent to a generator so that the generator adjusts the power generation paddle according to the instruction. This method detects the frequency change rate of the grid connection point, effectively predicts the next grid frequency change trend, and adjusts the power generation paddle in advance when it is detected that the dead zone will be entered, so that the response speed is fast.

Description

Technical Field

[0001] This application relates to the field of wind power generation, and in particular to a method, device and medium for primary frequency regulation pre-action control of wind power generation. Background Technology

[0002] Currently, wind power has become the primary or secondary power source for power grids in some regions, and the grid has explicitly required wind power plants to have primary frequency regulation capabilities. The main objective of primary frequency regulation for new energy sources is to enable wind turbine loads to adjust within a certain range based on a specific droop rate when the grid frequency exceeds the dead zone, thus limiting grid frequency fluctuations and maintaining grid frequency stability through automatic control. When the grid frequency rises, the primary frequency regulation function requires the turbines to rapidly reduce load using their thermal storage; conversely, the turbines rapidly increase load when the grid frequency falls.

[0003] Since the load regulation of wind power generation is mainly controlled and adjusted through the blade angle, and adjustments are only made when the grid frequency exceeds the dead zone, the response speed is relatively slow.

[0004] In view of the above, designing a fast-response wind power generation primary frequency regulation pre-action control method is an urgent problem to be solved by technical personnel in this field. Summary of the Invention

[0005] The purpose of this application is to provide a method, device, and medium for pre-action control of primary frequency regulation in wind power generation, so as to solve the problem of slow response speed of primary frequency regulation in power grid.

[0006] To address the aforementioned technical problems, this application provides a wind power generation primary frequency regulation pre-action control method, comprising:

[0007] Obtain the voltage of the PT and the current of the CT at the power generation station to determine the frequency of the grid connection point;

[0008] Obtain the rate of change of the frequency at each time detection point within a first preset time period;

[0009] Determine whether the absolute value of the rate of change of the frequency at each of the time detection points within the first preset time period is greater than a first threshold, and whether the frequency is within a first preset range;

[0010] If so, a frequency regulation load control command is sent to the generator so that the generator adjusts its blades according to the command.

[0011] Preferably, it further includes:

[0012] The first cumulative time that is less than the third threshold among the frequencies that are not within the first preset range and are greater than the second threshold;

[0013] Determine whether the first accumulated time is greater than the second preset time;

[0014] If so, proceed to the step of sending a frequency regulation load control command to the generator;

[0015] The second cumulative time that is greater than the third threshold among the frequencies that are not within the first preset range and are less than the fourth threshold;

[0016] Determine whether the second accumulated time is greater than the second preset time;

[0017] If so, proceed to the step of sending a frequency regulation load control command to the generator;

[0018] Wherein, the second threshold is less than the third threshold, and the third threshold is less than the fourth threshold.

[0019] Preferably, obtaining the rate of change of the frequency at each time detection point within a first preset time period includes:

[0020] The frequencies of multiple time points within a first preset time period are obtained; wherein the time intervals of each time point are equal, the preset number of time points constitute a sampling interval, and the first time point in each sampling interval is the time detection point, and only one time detection point is included.

[0021] The average value of the frequencies corresponding to each time point in each sampling interval is taken as the frequency of the time detection point in each sampling interval;

[0022] The second derivative of the frequency of each time detection point is obtained based on the frequency of each time detection point and the time interval between the time detection points, and is used as the rate of change of the frequency of each time detection point.

[0023] Preferably, after sending a frequency regulation load command to the generator, the method further includes:

[0024] Determine whether the frequency is greater than the second threshold and less than the fourth threshold within a third preset time period;

[0025] If so, cancel the adjustment of the power generation blades.

[0026] Preferably, before obtaining the rate of change of the frequency at each time detection point within a first preset time period, the method further includes:

[0027] Filter out noise from the signal at the specified frequency.

[0028] Preferably, the number of time points in each of the sampling intervals is ten.

[0029] To solve the above-mentioned technical problems, this application provides a wind power generation primary frequency regulation pre-action control device, comprising:

[0030] The first acquisition module is used to acquire the voltage of the PT and the current of the CT of the power generation station to determine the frequency of the grid connection point;

[0031] The second acquisition module is used to acquire the rate of change of the frequency at each time detection point within a first preset time period;

[0032] The judgment module is used to determine whether the absolute value of the rate of change of the frequency at each time detection point within a first preset time period is greater than a first threshold and the frequency is within a first preset range; if so, the sending module is triggered.

[0033] The transmitting module is used to send a frequency regulation load control command to the generator so that the generator adjusts the generator blades according to the command.

[0034] To address the aforementioned technical problems, this application also provides another wind power generation primary frequency regulation pre-action control device, comprising:

[0035] Memory, used to store computer programs;

[0036] A processor is used to execute the computer program to implement the steps of the wind power generation primary frequency regulation pre-action control method described above.

[0037] To address the aforementioned technical problems, this application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the wind power generation primary frequency regulation pre-action control method described above.

[0038] The wind power generation primary frequency regulation pre-action control method provided in this application determines the frequency at the grid connection point by acquiring the voltage of the PT and the current of the CT at the power station, and obtains the frequency change rate at each time detection point within a first preset time period; it then determines whether the absolute value of the frequency change rate at each time detection point within the first preset time period is greater than a first threshold and the frequency is within a first preset range; if so, it sends a primary frequency regulation load control command to the generator so that the generator can adjust the generator blades according to the command. This method effectively predicts the future trend of grid frequency change by detecting the frequency change rate at the grid connection point, and adjusts the generator blades in advance when it detects that it is about to enter a dead zone, resulting in a fast response speed.

[0039] In addition, this application also provides a wind power generation primary frequency regulation pre-action control device and a computer-readable storage medium, with the same effect as above. Attached Figure Description

[0040] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 A flowchart of a wind power generation primary frequency regulation pre-action control method provided in this application embodiment;

[0042] Figure 2 A flowchart of another wind power generation primary frequency regulation pre-action control method provided in the embodiments of this application;

[0043] Figure 3 This is a diagram showing the selection locations of various time detection points provided in the embodiments of this application;

[0044] Figure 4 A schematic diagram of the structure of a wind power generation primary frequency regulation pre-action control device provided in this application embodiment;

[0045] Figure 5 A schematic diagram of another wind power generation primary frequency regulation pre-action control device provided in an embodiment of this application. Detailed Implementation

[0046] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this application.

[0047] The core of this application is to provide a method, device, and medium for pre-action control of primary frequency regulation in wind power generation, which solves the problem of slow response speed of primary frequency regulation in power grids.

[0048] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] Figure 1This document presents a flowchart of a wind power generation primary frequency regulation pre-action control method provided in an embodiment of this application. It is understood that wind power has become the primary or secondary power source for power grids in some regions, and the power grid has explicitly required wind power plants to have primary frequency regulation capabilities. The main objective of primary frequency regulation for new energy sources is to enable wind turbine loads to perform load actions within a certain range based on a certain droop rate when the grid frequency exceeds the dead zone. However, because the energy drive of wind power generation is significantly affected by weather, load regulation is mainly controlled and adjusted through blade angle, resulting in a slow response speed. Consequently, the response speed and quality of wind power generation in primary frequency regulation often fail to meet the grid's performance requirements. Therefore, to improve the response speed of primary frequency regulation, such as... Figure 1 As shown, the primary frequency regulation pre-action control method for wind power generation includes:

[0050] S10: Obtain the voltage of the PT and the current of the CT at the power generation station to determine the frequency of the grid connection point.

[0051] S11: Obtain the rate of change of frequency of each time detection point within the first preset time period.

[0052] S12: Determine whether the absolute value of the rate of change of the frequency of each time detection point within the first preset time is greater than the first threshold and the frequency is within the first preset range; if so, proceed to step S13.

[0053] S13: Send a frequency regulation load control command to the generator so that the generator can adjust the generator blades according to the command.

[0054] Understandably, voltage transformers (PTs) and current transformers (CTs) are indispensable electrical components in power plants, substations, and other power transmission and supply systems. Furthermore, wind power generation is mostly integrated into the grid on a large scale in the form of wind farms. Before primary frequency regulation at a power plant, it is necessary to first determine the grid connection frequency and then adjust it accordingly. This requires obtaining the voltage of the PTs and the current of the CTs at the power plant to determine the grid connection frequency. Traditional primary frequency regulation methods involve adjusting the frequency when it exceeds the dead zone, resulting in a slow response. The dead zone in primary frequency regulation refers to the frequency difference set to prevent unnecessary operation of the turbine control valves when the grid frequency changes within a small range. In other words, for stable unit operation, when the grid frequency is basically stable at its rated value, the unit does not regulate small frequency fluctuations; regulation only occurs when the frequency change exceeds the rated frequency. Generally, a grid frequency below 49.95Hz or above 50.05Hz is considered to have entered the dead zone. Therefore, in order to determine in advance whether the frequency will exceed the dead zone, it is necessary to predict the frequency change trend. In this embodiment, after obtaining the frequency of the grid connection point, the rate of change of the frequency at the time detection point is obtained within a first preset time period, that is, the frequency change trend of the grid connection point is obtained within the first preset time period.

[0055] It is important to note that the number of time detection points determines the accuracy of the frequency change rate acquisition; the more time detection points selected, the more accurate the acquired frequency change rate. There are no restrictions on the number of time detection points, the selection method, or the method of acquiring the frequency change rate; it all depends on the specific implementation. Simultaneously, the first preset time also affects the transmission time of subsequent frequency modulation commands. Therefore, different first preset times will result in different response speeds for a single frequency modulation. Here, the length of the first preset time is not limited; it depends on the specific implementation.

[0056] After obtaining the absolute value of the rate of change at each time detection point within the first preset time period, it is necessary to compare this rate of change with the first threshold, and also to determine whether the frequency of the time detection point is within the first preset range. It is understandable that if the rate of change of frequency is greater than a specified threshold, and the frequency is about to exceed the dead zone, then the frequency will definitely exceed the dead zone in the subsequent time period. It should be noted that generally, when the grid frequency is below 49.95Hz or above 50.05Hz, it is considered to have entered the dead zone. When the grid frequency decreases, its rate of change should be negative. Therefore, when comparing the rate of change of frequency with the first threshold, the absolute value of the rate of change of frequency should be taken. The magnitude of the first threshold is not limited here, but depends on the specific implementation.

[0057] In addition, the first preset range is a frequency range. When the frequency is within the first preset range, if the change rate of the frequency is greater than the first threshold, it can be determined that the frequency is about to exceed the dead zone. It can be understood that the first preset range must be close to the dead zone and does not include the specified frequency of the power grid, that is, 50 Hz. This can ensure the division of the range where the frequency is close to the dead zone. For example, the first preset range can be 49.95 Hz < f < 49.98 Hz and 50.02 Hz < f < 50.05 Hz. Here, the size of the first preset range is not limited and is determined according to the specific implementation situation. After obtaining the conclusion that the frequency is about to exceed the dead zone, a primary frequency regulation load control command is sent to the generator once to adjust the rotational speed of the generator blade when the frequency has not yet exceeded the dead zone, so that the frequency is maintained within the specified range and does not exceed the dead zone.

[0058] In this embodiment, the frequency of the grid connection point is determined by obtaining the voltage of the PT and the current of the CT of the power generation station, and the change rate of the frequency at each time detection point within the first preset time is obtained; it is judged whether the absolute value of the change rate of the frequency at each time detection point within the first preset time is greater than the first threshold and the frequency is within the first preset range; if so, a primary frequency regulation load control command is sent to the generator so that the generator adjusts the generator blade according to the command. This method effectively predicts the change trend of the next power grid frequency by detecting the change rate of the grid connection point frequency of the power grid, and adjusts the generator blade in advance when it is detected that it is about to enter the dead zone, with a fast response speed.

[0059] Figure 2 It is a flowchart of another primary frequency regulation pre-action control method for wind power generation provided by an embodiment of the present application. In order to maintain the frequency at the specified frequency, that is, 50 Hz, on the basis of Figure 1 The primary frequency regulation pre-action control method for wind power generation further includes:

[0060] S14: Statistically calculate the first cumulative time that is less than the third threshold among the frequencies that are not within the first preset range and greater than the second threshold.

[0061] S15: Judge whether the first cumulative time is greater than the second preset time. If so, enter step S13.

[0062] S16: Statistically calculate the second cumulative time that is greater than the third threshold among the frequencies that are not within the first preset range and less than the fourth threshold.

[0063] S17: Judge whether the second cumulative time is greater than the second preset time. If so, enter step S13.

[0064] Among them, the second threshold is less than the third threshold, and the third threshold is less than the fourth threshold.

[0065] It can be understood that taking the first preset range as 49.95Hz < f < 49.98Hz and 50.02Hz < f < 50.05Hz as an example, the frequency range between the two ranges in the first preset range is 49.98Hz < f < 50.02Hz. When the frequency is within this range, although it does not exceed the dead zone, when the frequency is not 50Hz, the specified frequency, as the grid frequency changes, the frequency still has the possibility of exceeding the dead zone. Therefore, in order to maintain the grid frequency at the specified frequency, the first cumulative time less than the third threshold among the frequencies not within the first preset range and greater than the second threshold is statistically calculated. Here, the second threshold is 49.95Hz, and the third threshold is 50Hz; specifically, therefore, the first cumulative time when the grid frequency is not within the first preset range and between 49.95Hz and 50Hz is statistically calculated, and it is judged whether the first cumulative time is greater than the second preset time. It can be understood that when the first cumulative time is greater than a preset time, it can be considered that the frequency may have a tendency to exceed the dead zone, and thus a primary frequency modulation load control instruction is sent to the generator to adjust the power generation blades. The second preset time is not limited here and is determined according to the specific implementation situation.

[0066] Similarly, the second cumulative time greater than the third threshold among the frequencies not within the first preset range and less than the fourth threshold is statistically calculated. Here, the fourth threshold is 50.05Hz, and the third threshold is 50Hz; specifically, therefore, the second cumulative time when the grid frequency is not within the first preset range and between 50Hz and 50.05Hz is statistically calculated, and it is judged whether the second cumulative time is greater than the second preset time. If so, a primary frequency modulation load control instruction is sent to the generator to adjust the power generation blades.

[0067] In this embodiment, by statistically calculating the first cumulative time less than the third threshold among the frequencies not within the first preset range and greater than the second threshold and the second cumulative time greater than the third threshold among the frequencies not within the first preset range and less than the fourth threshold, and comparing the first cumulative time and the second cumulative time with the second preset time respectively, when one of the two cumulative times is greater than the second preset time, a primary frequency modulation load control instruction is sent to the generator to adjust the power generation blades, so that the frequency is maintained at the specified frequency and does not exceed the dead zone.

[0068] Based on the above embodiment:

[0069] As a preferred embodiment, obtaining the change rate of the frequency at each time detection point within the first preset time includes:

[0070] Obtaining the frequencies at multiple time points within the first preset time; where the time intervals of each time point are equal, a preset number of time points form a sampling interval, and the first time point in each sampling interval is the time detection point, and only one time detection point is included;

[0071] The average frequency of each time point in each sampling interval is taken as the frequency of the time detection point in each sampling interval.

[0072] The second derivative of the frequency at each time detection point is obtained based on the frequency and the time interval between the time detection points, and is used as the rate of change of the frequency at each time detection point.

[0073] It is understood that the selection method for each time detection point and the method for obtaining the rate of change of frequency are not limited in the above embodiments, and are determined according to the specific implementation. In this embodiment, as a preferred embodiment, the selection of each time detection point is as follows: Figure 3 As shown. Figure 3 The location map for each time detection point provided in this application embodiment illustrates that the rate of change of frequency refers to how quickly the frequency changes over a period of time. Therefore, in this embodiment, after acquiring the frequency over a period of time, the rate of change of frequency is obtained by calculating the second derivative of the frequency. To make the results more accurate, this embodiment uses the method of averaging the frequencies of time points within a first preset time period as the frequency of the time detection point; firstly, the frequencies of multiple time points within the first preset time period are acquired; it should be noted that the time intervals between each time point are equal, such as... Figure 3 As shown, the time interval is t. Subsequently, a preset number of time points are defined as a sampling interval, and the time length of the sampling interval is T. It can be understood that the time length T of the sampling interval is the product of the time interval t of the time points and the number of time points in the sampling interval.

[0074] It is important to note that the first time point in each sampling interval is designated as the time detection point. This ensures that each sampling interval includes only one time detection point, and when averaging the frequencies corresponding to each time point within a sampling interval, this average value is only used as the frequency of the time detection points within that sampling interval. Finally, the second derivative of the frequency of each time detection point is obtained based on the frequency and the time interval between the time detection points, and this derivative is used as the rate of change of the frequency at each time detection point. It can be understood that the time length of each sampling interval is the time interval between the time detection points. Figure 3 Taking three time points t1, t2, and t3 as an example, after obtaining the frequencies of t1, t2, and t3, the following formula is used to calculate the rate of change of the frequency at time point t2:

[0075]

[0076] The rate of change of frequency at time detection point t2 can be obtained, where Δt is the time interval between the two time detection points. Similarly, this method can be used to obtain the rate of change of frequency at each time detection point within a first preset time period, thereby predicting the trend of frequency change.

[0077] Furthermore, there is no limit to the preset number of time points in each sampling interval. It is understood that the more time points there are, the more accurate the average value calculated based on the time points will be, depending on the specific implementation. There is also no limit to the time interval between each time point, depending on the specific implementation.

[0078] In this embodiment, by setting a sampling interval containing multiple time points within a first preset time period, multiple time detection points with equal time intervals are obtained; the rate of change of frequency within the first preset time period is calculated using the time interval of the frequencies of these time detection points, and the calculation result is accurate.

[0079] Based on the above embodiments, in order to protect the safety and stability of the entire power grid and avoid the impact of primary frequency regulation on the stability of the power grid, such as... Figure 2 As shown, after sending a frequency regulation load command to the generator, the process also includes:

[0080] S18: Determine whether the frequency is greater than the second threshold and less than the fourth threshold within the third preset time period; if so, proceed to step S19.

[0081] S19: Cancel adjustment of generator blades.

[0082] It is understood that in the above embodiment, when the grid frequency is detected to be about to exceed the dead zone, a frequency regulation load control command is sent to the generator to adjust the generator blades. The command signal can be transmitted via the IEC60870-5-104 protocol (Telecontrol equipment and systems-Part 5-104, IEC104) or the Transmission Control Protocol (TCP) and other communication protocols, without limitation. After receiving the command, the generator begins to adjust the generator blades to change the grid frequency. However, in actual operation, it may be affected by factors such as weather conditions. When the blades are preparing to adjust, the frequency may not have exceeded the dead zone, and continuing the frequency regulation operation may affect the stability of the grid. Therefore, to avoid this situation, in this embodiment, after sending the frequency regulation load command to the generator, it is first determined whether the frequency is greater than the second threshold and less than the fourth threshold within a third preset time. In the above embodiment, the second threshold is 49.95Hz and the fourth threshold is 50.05Hz. That is to say, if the frequency has not exceeded the dead zone within the third preset time, the adjustment of the generator blades is canceled, and the frequency regulation operation is terminated. There is no limit to the third preset time; it depends on the specific implementation situation.

[0083] In this embodiment, after sending a primary frequency regulation load command to the generator, if the frequency has not yet exceeded the dead zone, the adjustment of the generator blades is canceled and the primary frequency regulation action is terminated; this protects the safety and stability of the power grid and avoids the primary frequency regulation from affecting the stability of the power grid.

[0084] Based on the above embodiments, in order to improve the stability of a single frequency modulation operation, such as Figure 2 As shown, before obtaining the rate of change of the frequency at each time detection point within the first preset time period, the following steps are also included:

[0085] S20: Noise in the filtered frequency signal.

[0086] It is understandable that the frequency signal obtained by collecting the voltage of the PT and the current of the CT at the grid connection point in a power plant may contain some interference. In order to accurately obtain the rate of change of frequency later, noise filtering processing of the signal is required before obtaining the rate of change of frequency. There are no restrictions on the specific processing method of the frequency signal; it depends on the specific implementation situation.

[0087] In this embodiment, the frequency signal is filtered for noise before the frequency change rate is obtained, which makes the frequency change rate more accurate and improves the stability of a single frequency modulation operation.

[0088] Based on the above embodiments:

[0089] In a preferred embodiment, the number of time points in each sampling interval is ten.

[0090] In the above embodiments, the preset number of time points in each sampling interval is not limited and depends on the specific implementation. As a preferred embodiment, in this embodiment, the preset number of time points is ten. It can be understood that, since frequency changes are affected by different factors, the frequency may change over a wide range in a short period of time, even exceeding the dead zone; in order to obtain the rate of change of frequency more quickly and to ensure the accuracy of the frequency average value, setting the number of time points in the sampling interval in the first preset time to ten is a preferred implementation method.

[0091] In this embodiment, the sampling interval consisting of ten time points can ensure the accuracy of the average frequency calculation, while not affecting the judgment of the rate of change of frequency within the first preset time period.

[0092] The above embodiments have described the wind power generation primary frequency regulation pre-action control method in detail. This application also provides embodiments corresponding to the wind power generation primary frequency regulation pre-action control device. It should be noted that this application describes the device embodiments from two perspectives: one based on functional modules and the other based on hardware.

[0093] Figure 4 A schematic diagram of a wind power generation primary frequency regulation pre-action control device provided in this application embodiment is shown below. Figure 4 As shown, the wind power generation primary frequency regulation pre-action control device includes:

[0094] The first acquisition module 10 is used to acquire the voltage of the PT and the current of the CT of the power generation station to determine the frequency of the grid connection point.

[0095] The second acquisition module 11 is used to acquire the rate of change of the frequency of each time detection point within a first preset time period.

[0096] The judgment module 12 is used to determine whether the absolute value of the rate of change of the frequency at each time detection point within a first preset time period is greater than the first threshold and the frequency is within the first preset range; if so, the sending module is triggered.

[0097] The transmitting module 13 is used to send a primary frequency regulation load control command to the generator so that the generator can adjust the generator blades according to the command.

[0098] Since the embodiments of the apparatus and the embodiments of the method correspond to each other, please refer to the description of the embodiments of the method for the embodiments of the apparatus, which will not be repeated here.

[0099] Figure 5 A schematic diagram of another wind power generation primary frequency regulation pre-action control device provided in this application embodiment is shown below. Figure 5 As shown, the wind power generation primary frequency regulation pre-action control device includes:

[0100] Memory 20 is used to store computer programs.

[0101] The processor 21 is used to execute a computer program to implement the steps of the wind power generation primary frequency regulation pre-action control method mentioned in the above embodiments.

[0102] The wind power generation primary frequency regulation pre-action control device provided in this embodiment can include, but is not limited to, smartphones, tablets, laptops, or desktop computers.

[0103] The processor 21 may include one or more processing cores, such as a quad-core processor or an octa-core processor. The processor 21 may be implemented using at least one hardware form selected from DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), and PLA (Programmable Logic Array). The processor 21 may also include a main processor and a coprocessor. The main processor, also known as a CPU (Central Processing Unit), is used to process data in the wake-up state; the coprocessor is a low-power processor used to process data in the standby state. In some embodiments, the processor 21 may integrate a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content to be displayed on the screen. In some embodiments, the processor 21 may also include an AI (Artificial Intelligence) processor, which is used to handle computational operations related to machine learning.

[0104] The memory 20 may include one or more computer-readable storage media, which may be non-transitory. The memory 20 may also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices or flash memory devices. In this embodiment, the memory 20 is used to store at least the following computer program 201, which, after being loaded and executed by the processor 21, can implement the relevant steps of the wind power generation primary frequency regulation pre-action control method disclosed in any of the foregoing embodiments. In addition, the resources stored in the memory 20 may also include an operating system 202 and data 203, and the storage method may be temporary or permanent storage. The operating system 202 may include Windows, Unix, Linux, etc. The data 203 may include, but is not limited to, data involved in the wind power generation primary frequency regulation pre-action control method.

[0105] In some embodiments, the wind power generation primary frequency regulation pre-action control device may further include a display screen 22, an input / output interface 23, a communication interface 24, a power supply 25, and a communication bus 26.

[0106] Those skilled in the art will understand that Figure 5 The structure shown does not constitute a limitation on the primary frequency regulation pre-action control device for wind power generation and may include more or fewer components than shown.

[0107] Finally, this application also provides an embodiment corresponding to a computer-readable storage medium. The computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps described in the above method embodiments.

[0108] It is understood that if the methods in the above embodiments are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and executes all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0109] The foregoing provides a detailed description of a wind power generation primary frequency regulation pre-action control method, apparatus, and medium provided in this application. The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

[0110] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only 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.

Claims

1. A method for pre-action control of primary frequency regulation in wind power generation, characterized in that, include: Obtain the voltage of the PT and the current of the CT at the power generation station to determine the frequency of the grid connection point; Obtain the rate of change of the frequency at each time detection point within a first preset time period; Determine whether the absolute value of the rate of change of the frequency at each of the time detection points within the first preset time period is greater than a first threshold, and whether the frequency is within a first preset range; If so, a frequency regulation load control command is sent to the generator so that the generator adjusts its blades according to the command; The acquisition of the rate of change of the frequency at each time detection point within a first preset time period includes: The frequencies of multiple time points within a first preset time period are obtained; wherein the time intervals of each time point are equal, the preset number of time points constitute a sampling interval, and the first time point in each sampling interval is the time detection point, and only one time detection point is included. The average value of the frequencies corresponding to each time point in each sampling interval is taken as the frequency of the time detection point in each sampling interval; The second derivative of the frequency of each time detection point is obtained based on the frequency of each time detection point and the time interval between the time detection points, and is used as the rate of change of the frequency of each time detection point.

2. The wind power generation primary frequency regulation pre-action control method according to claim 1, characterized in that, Also includes: The first cumulative time that is less than the third threshold among the frequencies that are not within the first preset range and are greater than the second threshold; Determine whether the first accumulated time is greater than the second preset time; If so, proceed to the step of sending a frequency regulation load control command to the generator; The second cumulative time that is greater than the third threshold among the frequencies that are not within the first preset range and are less than the fourth threshold; Determine whether the second accumulated time is greater than the second preset time; If so, proceed to the step of sending a frequency regulation load control command to the generator; Wherein, the second threshold is less than the third threshold, and the third threshold is less than the fourth threshold.

3. The wind power generation primary frequency regulation pre-action control method according to claim 1, characterized in that, After sending a frequency regulation load command to the generator, the following is also included: Determine whether the frequency is greater than a second threshold and less than a fourth threshold within a third preset time period; If so, cancel the adjustment of the power generation blades.

4. The wind power generation primary frequency regulation pre-action control method according to any one of claims 1 to 3, characterized in that, Before obtaining the rate of change of the frequency at each time detection point within a first preset time period, the method further includes: Filter out noise from the signal at the specified frequency.

5. The wind power generation primary frequency regulation pre-action control method according to claim 1, characterized in that, The number of time points in each of the sampling intervals is ten.

6. A wind power generation primary frequency regulation pre-action control device, characterized in that, include: The first acquisition module is used to acquire the voltage of the PT and the current of the CT of the power generation station to determine the frequency of the grid connection point; The second acquisition module is used to acquire the rate of change of the frequency at each time detection point within a first preset time period; The judgment module is used to determine whether the absolute value of the rate of change of the frequency at each time detection point within a first preset time period is greater than a first threshold and the frequency is within a first preset range; if so, the sending module is triggered. The transmitting module is used to send a primary frequency regulation load control command to the generator so that the generator adjusts its blades according to the command. The acquisition of the rate of change of the frequency at each time detection point within a first preset time period includes: The frequencies of multiple time points within a first preset time period are obtained; wherein the time intervals of each time point are equal, the preset number of time points constitute a sampling interval, and the first time point in each sampling interval is the time detection point, and only one time detection point is included. The average value of the frequencies corresponding to each time point in each sampling interval is taken as the frequency of the time detection point in each sampling interval; The second derivative of the frequency of each time detection point is obtained based on the frequency of each time detection point and the time interval between the time detection points, and is used as the rate of change of the frequency of each time detection point.

7. A wind power generation primary frequency regulation pre-action control device, characterized in that, Includes memory used to store computer programs; A processor is configured to execute the computer program to implement the steps of the wind power generation primary frequency regulation pre-action control method as described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the wind power generation primary frequency regulation pre-action control method as described in any one of claims 1 to 5.

Images