Method and apparatus for frequency regulation of power grid having wind turbine participation

Abstract

Disclosed in the present invention are a method and apparatus for frequency regulation of a power grid having wind turbine participation. The method comprises: obtaining, in real time, frequency information of the power grid at a wind turbine grid connection point and wind turbine wind speed information, wherein the frequency information comprises frequency deviation and frequency change rate; in response to the frequency deviation being greater than a deviation threshold value, determining, according to the frequency change rate, a load shedding adaptive coefficient, wherein the load shedding adaptive coefficient is set on the basis of the frequency change rate and the wind turbine wind speed information; according to the determined load shedding adaptive coefficient, the frequency deviation, and the wind turbine wind speed information, determining load shedding information for wind turbine participation in power grid frequency regulation; and, according to the load shedding information and the wind turbine wind speed information, regulating the frequency of the power grid having wind turbine participation. By means of the present invention, load shedding for wind turbine participation at different moments of power grid frequency regulation is effectively controlled, thus improving the accuracy of wind turbine participation in power grid frequency regulation.

Description

Frequency modulation method and device for wind turbine participating in power grid Technical Field

[0001] The present invention relates to the field of new energy, and in particular to a method and device for frequency modulation of a wind turbine participating in a power grid. Background Art

[0002] As the proportion of new energy in the power grid continues to increase, traditional power generation units, mainly thermal power units, continue to decrease, and the problem of grid frequency stability becomes increasingly prominent. Therefore, more and more countries and regions have increased the requirements for new energy to participate in grid frequency regulation by modifying and updating grid guidelines.

[0003] When wind turbines participate in grid frequency regulation, a new wind turbine frequency response controller is added to support grid frequency. The input to the wind turbine frequency response controller is the frequency deviation at the wind turbine's grid connection point, and it controls the output active power required to support the wind turbine's frequency.

[0004] Existing wind turbine frequency response controllers typically release active power to the grid by releasing the kinetic energy stored in the wind turbine rotor. This solution is only feasible for short-term grid frequency support. For longer-term support of grid frequency drops, the large amount of kinetic energy released by the wind turbine can cause problems such as stalling, leading to overall system instability.

[0005] Therefore, research on reducing wind turbine loads can be used to provide backup capacity for wind turbines participating in grid frequency regulation, ensuring constant active power output when participating in grid frequency regulation, and making continuous wind turbine participation in grid frequency regulation feasible. However, existing wind turbine load reduction control only selects a single wind turbine load reduction based on experience. This load reduction effect cannot be effectively applied to load reduction control for wind turbines participating in grid frequency regulation at all times in the power system, thus affecting the accuracy of wind turbine participation in grid frequency regulation.

[0006] Summary of the Invention

[0007] The present invention provides a method and device for frequency modulation of a wind turbine participating in a power grid, so as to solve at least one of the above-mentioned problems.

[0008] According to a first aspect of the present invention, a method for frequency regulation of a wind turbine participating in a power grid is provided, the method comprising: acquiring frequency information of a power grid at a wind turbine grid-connected point and wind turbine wind speed information in real time, the frequency information comprising: a frequency deviation and a frequency change rate; in response to the frequency deviation being greater than a deviation threshold, determining a load reduction adaptive coefficient according to the frequency change rate, wherein the load reduction adaptive coefficient is set based on the frequency change rate and the wind turbine wind speed information; determining load reduction information for the wind turbine participating in power grid frequency regulation according to the determined load reduction adaptive coefficient, the frequency deviation and the wind turbine wind speed information; and performing frequency regulation on the wind turbine participating in the power grid according to the load reduction information and the wind turbine wind speed information.

[0009] Preferably, determining the load shedding information of the wind turbine participating in the grid frequency regulation based on the determined load shedding adaptive coefficient, the frequency deviation and the wind speed information of the wind turbine includes: determining the maximum power corresponding to the wind turbine wind speed information based on the wind speed information of the wind turbine; determining the load shedding information of the wind turbine participating in the grid frequency regulation based on the determined load shedding adaptive coefficient, the frequency deviation and the maximum power.

[0010] Furthermore, frequency modulation of the wind turbine participating in the power grid according to the load shedding information and the wind speed information of the wind turbine includes: determining the active power of the wind turbine participating in the power grid frequency modulation according to the load shedding information and the maximum power; and frequency modulation of the wind turbine participating in the power grid according to the determined active power.

[0011] Specifically, real-time acquisition of the frequency information of the wind turbine grid connection point power grid includes: real-time acquisition of the current frequency of the wind turbine grid connection point power grid; determining the frequency deviation based on the current frequency and the rated frequency; and determining the frequency change rate based on the current frequency and the previous moment frequency of the wind turbine grid connection point power grid.

[0012] Specifically, determining the load shedding adaptive coefficient according to the frequency change rate includes: determining the load shedding adaptive coefficient according to the frequency change rate and its weight, the wind speed information of the wind turbine and its weight.

[0013] Furthermore, the load reduction adaptive coefficient is set in the following manner: in response to the first frequency change rate being less than a predetermined value, the load reduction adaptive coefficient is set according to the first frequency change rate and its first frequency weight, the first wind turbine wind speed information and its first wind speed weight; in response to the second frequency change rate being equal to the predetermined value, the load reduction adaptive coefficient is set according to the second frequency change rate, the second wind turbine wind speed information and the second weight; in response to the third frequency change rate being greater than a predetermined value, the load reduction adaptive coefficient is set according to the third frequency change rate and its third frequency weight, the third wind turbine wind speed information and its third wind speed weight.

[0014] According to a second aspect of the present invention, a frequency regulation device for a wind turbine participating in a power grid is provided, the device comprising: an information acquisition unit, for acquiring in real time the frequency information of the power grid at the wind turbine grid connection point and the wind speed information of the wind turbine, the frequency information comprising: a frequency deviation and a frequency change rate; an adaptive coefficient determination unit, for determining a load reduction adaptive coefficient according to the frequency change rate in response to the frequency deviation being greater than a deviation threshold, wherein the load reduction adaptive coefficient is set based on the frequency change rate and the wind speed information of the wind turbine; a load reduction information determination unit, for determining the load reduction information of the wind turbine participating in the power grid frequency regulation according to the determined load reduction adaptive coefficient, the frequency deviation and the wind speed information of the wind turbine; and a frequency regulation unit, for performing frequency regulation on the wind turbine participating in the power grid according to the load reduction information and the wind speed information of the wind turbine.

[0015] Specifically, the load shedding information determination unit includes: a maximum power determination module, used to determine the maximum power corresponding to the wind turbine wind speed information according to the wind turbine wind speed information; a load shedding information determination module, used to determine the load shedding information of the wind turbine participating in the grid frequency regulation according to the determined load shedding adaptive coefficient, the frequency deviation and the maximum power.

[0016] Furthermore, the frequency regulation unit includes: an active power determination module, used to determine the active power of the wind turbine participating in grid frequency regulation based on the load reduction information and the maximum power; and a frequency regulation module, used to perform frequency regulation on the wind turbine participating in the grid based on the determined active power.

[0017] Specifically, the device also includes: an adaptive coefficient setting unit, used to set the load shedding adaptive coefficient in the following manner: in response to the first frequency change rate being less than a predetermined value, setting the load shedding adaptive coefficient according to the first frequency change rate and its first frequency weight, the first wind turbine wind speed information and its first wind speed weight; in response to the second frequency change rate being equal to the predetermined value, setting the load shedding adaptive coefficient according to the second frequency change rate, the second wind turbine wind speed information and the second weight; in response to the third frequency change rate being greater than a predetermined value, setting the load shedding adaptive coefficient according to the third frequency change rate and its third frequency weight, the third wind turbine wind speed information and its third wind speed weight.

[0018] At the same time, the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the above method is implemented when the processor executes the computer program.

[0019] At the same time, the present invention also provides a computer-readable storage medium, which stores a computer program for executing the above method.

[0020] It can be seen from the above technical solution that by acquiring the frequency information of the power grid at the wind turbine grid connection point and the wind turbine wind speed information in real time, when the frequency deviation is greater than the deviation threshold, the load reduction adaptive coefficient is determined according to the frequency change rate, and then the load reduction information of the wind turbine participating in the grid frequency regulation is determined according to the determined load reduction adaptive coefficient, the frequency deviation and the wind turbine wind speed information, and then the wind turbine participating in the grid frequency regulation is processed according to the load reduction information and the wind turbine wind speed information. The load reduction adaptive coefficient of this technical solution is set based on the frequency change rate and the wind turbine wind speed information. Different load reduction adaptive coefficients can be set at different stages of the wind turbine participating in the grid frequency regulation, so that the load reduction amount in different frequency regulation stages can be obtained, so that the load reduction of the wind turbine participating in the grid frequency regulation at different times can be effectively controlled, thereby improving the accuracy of the wind turbine participating in the grid frequency regulation.

[0021] In order to make the above and other objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] FIG1 is a flow chart of a method for wind turbines to participate in frequency modulation of a power grid according to an embodiment of the present invention;

[0024] FIG2 is a schematic diagram of a power-speed curve of a wind turbine at different wind speeds according to an embodiment of the present invention;

[0025] FIG3 is a schematic diagram of a curve showing changes in a load shedding adaptive coefficient over time according to an embodiment of the present invention;

[0026] 4 is a flow chart of wind turbines participating in grid frequency regulation and load shedding based on adaptive control according to an embodiment of the present invention;

[0027] FIG5 is a structural block diagram of a frequency regulation device for a wind turbine participating in a power grid according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] In the process of realizing this application, the applicant found that:

[0030] Wind turbines output active power for extended periods to support grid frequency. Stable active power output can be maintained when participating in grid frequency regulation by reducing wind turbine load. However, existing wind turbine load reduction control methods rely solely on empirically selected single wind turbine load reduction amounts. This load reduction effect cannot be effectively applied to wind turbine load reduction control during power system frequency regulation at different times. This, in turn, affects the accuracy of wind turbine frequency regulation.

[0031] In view of this, an embodiment of the present invention provides a frequency regulation scheme for wind turbines to participate in the power grid. This scheme can obtain the load reduction amount in different frequency regulation stages by setting different load reduction adaptive coefficients at different stages when the wind turbine participates in the power grid frequency regulation, thereby effectively controlling the load reduction amount when the wind turbine participates in the power grid frequency regulation at different times, thereby improving the accuracy of the wind turbine's participation in the power grid frequency regulation.

[0032] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0033] FIG1 is a flow chart of a method for wind turbines to participate in frequency modulation of a power grid according to an embodiment of the present invention. As shown in FIG1 , the method includes:

[0034] Step 101 : Acquire frequency information of the power grid at the wind turbine grid connection point and wind turbine wind speed information in real time, wherein the frequency information includes frequency deviation and frequency change rate.

[0035] In specific implementation, the current frequency of the power grid at the wind turbine grid connection point can be obtained in real time; at the same time, the frequency deviation is determined based on the current frequency and the rated frequency, and the frequency change rate is determined based on the current frequency and the previous moment frequency of the power grid at the wind turbine grid connection point.

[0036] Step 102 : In response to the frequency deviation being greater than a deviation threshold, determining a load shedding adaptive coefficient according to the frequency change rate, wherein the load shedding adaptive coefficient is set based on the frequency change rate and wind speed information of the wind turbine.

[0037] In one embodiment, the load shedding adaptive coefficient may be determined according to the frequency change rate and its weight, and the wind speed information of the wind turbine and its weight.

[0038] Specifically, in response to the first frequency change rate being less than a predetermined value, setting a load shedding adaptive coefficient according to the first frequency change rate and its first frequency weight, the first wind turbine wind speed information and its first wind speed weight;

[0039] In response to the second frequency change rate being equal to a predetermined value, setting a load shedding adaptive coefficient according to the second frequency change rate, the second wind turbine wind speed information, and a second weight;

[0040] In response to the third frequency change rate being greater than a predetermined value, a load shedding adaptive coefficient is set according to the third frequency change rate and its third frequency weight, the third wind turbine wind speed information and its third wind speed weight.

[0041] For example, the preset value is 0. When the frequency change rate is less than 0, that is, the frequency at the current moment is smaller than the frequency at the previous moment, f t -f t-1<0, the load shedding adaptive coefficient can be set based on the frequency change rate and its frequency weight, as well as the corresponding wind turbine wind speed information and its wind speed weight. Similarly, when the frequency change rate is greater than or equal to 0, the load shedding adaptive coefficient is also set in a similar manner.

[0042] In actual operation, since the frequency drop rate is too fast and the deviation is too large in the initial stage of the grid frequency drop, the load reduction adaptive coefficient should be selected as a larger value at this time; when the grid frequency reaches the lowest point and begins to recover, the load reduction adaptive coefficient should be continuously reduced to make the wind turbine return to the stable operating point.

[0043] Step 103 : determining load shedding information for the wind turbine to participate in grid frequency regulation based on the determined load shedding adaptive coefficient, the frequency deviation, and wind speed information of the wind turbine.

[0044] Step 104 : performing frequency modulation on the wind turbine participating in the power grid according to the load reduction information and the wind speed information of the wind turbine.

[0045] In one embodiment, in the process of implementing the above-mentioned step 103, the maximum power corresponding to the wind turbine wind speed information can be determined based on the wind turbine wind speed information; then, the load reduction information of the wind turbine participating in the grid frequency regulation is determined based on the determined load reduction adaptive coefficient, the frequency deviation and the maximum power.

[0046] Furthermore, in the process of implementing step 104, the active power of the wind turbine participating in grid frequency regulation may be determined according to the load reduction information and the maximum power; and then the wind turbine participating in grid frequency regulation may be processed according to the determined active power.

[0047] That is, in the process of implementing the embodiment of the present invention, the relationship between the power of the fan and the wind speed of the fan at different wind speeds can be obtained. In one embodiment, the wind speed of the fan can be represented by the fan rotation speed.

[0048] FIG2 is a schematic diagram of the power-speed curve of a wind turbine according to an embodiment of the present invention at different wind speeds. As shown in FIG2 , a wind turbine generally generates a maximum power P MPPT (Corresponding to the maximum power mentioned above) The tracking point works to achieve maximum power tracking. When the wind turbine participates in the grid frequency regulation, the wind turbine speed will drop. At this time, there is a risk of instability of the wind turbine. When the wind turbine is operated under load reduction control, the operating curve of the wind turbine will drop, as shown in P in Figure 2. de At this time, the wind turbine's allowable active power output ΔP for participating in the grid frequency response is FR (corresponding to the above active power) is shown in the following formula (1):

[0049] ΔP FR =P MPPT -P de =d rate ·PMPPT (1)

[0050] Where, d rate is the load reduction rate of the fan (corresponding to the above load reduction information). MPPT It can be expressed as follows:

[0051] Where ρ is the air density, S is the swept area of ​​the fan blade, and C p is the wind energy utilization coefficient of the wind turbine, V w is the wind speed, δ is the regulation coefficient, and Δf is the grid frequency deviation.

[0052] According to the above formula, the relationship between the wind turbine's response to the grid frequency deviation, load reduction rate and wind speed is derived, as shown in the following formula (4):

[0053] According to Equation (4), the grid frequency deviation is affected by the wind turbine load shedding rate and wind speed. In other words, the wind turbine load shedding rate is also affected by the grid frequency deviation and wind speed. Therefore, under different grid frequency deviations and different wind speeds, the wind turbine load shedding rate should be different.

[0054] Therefore, in the embodiment of the present invention, different load reduction rates are used at different stages of the wind turbine's participation in grid frequency regulation to more accurately regulate the wind turbine's participation in the grid frequency regulation. Compared with the prior art that uses a single wind turbine load reduction amount, its load reduction effect cannot be effectively applied to the load reduction control of the wind turbine's participation in grid frequency regulation at different times in the power system, which also affects the accuracy of the wind turbine's participation in grid frequency regulation.

[0055] The embodiment of the present invention obtains the frequency information of the power grid at the wind turbine grid connection point and the wind speed information of the wind turbine in real time. When the frequency deviation is greater than the deviation threshold, the load reduction adaptive coefficient is determined according to the frequency change rate. Subsequently, the load reduction information of the wind turbine participating in the power grid frequency regulation is determined according to the determined load reduction adaptive coefficient, the frequency deviation and the wind turbine wind speed information. Then, the wind turbine participating in the power grid is frequency regulated according to the load reduction information and the wind turbine wind speed information. The load reduction adaptive coefficient of the embodiment of the present invention is set based on the frequency change rate and the wind turbine wind speed information. Different load reduction adaptive coefficients can be set at different stages of the wind turbine participating in the power grid frequency regulation, so that the load reduction amount in different frequency regulation stages can be obtained, thereby effectively controlling the load reduction amount of the wind turbine participating in the power grid frequency regulation at all times, and thus improving the accuracy of the wind turbine participating in the power grid frequency regulation.

[0056] In order to better understand the present invention, the process of setting the load shedding adaptive coefficient is described in detail below.

[0057] In actual operation, since the frequency drop rate is too fast and the deviation is too large in the initial stage of the grid frequency drop, the load reduction adaptive coefficient should be selected as a larger value at this time; when the grid frequency reaches the lowest point and begins to recover, the load reduction adaptive coefficient should be continuously reduced to make the wind turbine return to the stable operating point.

[0058] FIG3 is a schematic diagram of a curve showing the change of the load shedding adaptive coefficient over time, wherein point A is the moment when the grid frequency begins to drop, and point C is the moment when the grid frequency begins to recover after reaching the lowest point.

[0059] According to the different stages of wind turbine participation in grid frequency regulation, the load reduction adaptive coefficient k is established. adap (df / dt,V w ), which is expressed by the following formula (5):

[0060] Where f is the frequency, V w is the wind speed, k 11 , k2, k 31 is the weight of the frequency change rate at different stages, k 12 , k2, k 32 is the wind speed weight at different stages, V w,rate is the rated value of wind speed; t A , t B , t C They are the times corresponding to points A, B, and C in Figure 3, respectively.

[0061] According to the relationship between the load reduction rate when the wind turbine participates in grid frequency regulation, the rate of change of grid frequency and wind speed, the wind turbine load reduction rate can be obtained as shown in the following formula (6):

[0062] Based on the obtained load reduction rate and combined with the above formula (1), the active power required for the current wind turbine to participate in the grid frequency regulation can be obtained, so that the wind turbine can participate in the grid frequency regulation according to the determined active power.

[0063] Based on the above description, the process of wind turbines participating in grid frequency regulation and load reduction based on adaptive control will be described in detail below in conjunction with FIG4 .

[0064] As shown in FIG4 , the process includes steps 401 to 406 :

[0065] Step 401: Use the wind turbine's phase-locked loop to track and measure the grid frequency at the wind turbine's grid connection point in real time and obtain the current speed (or wind speed). Calculate the frequency deviation and frequency change rate. When the grid frequency deviation is observed to be greater than 0.5 Hz, it indicates that the grid frequency has dropped. At this time, the wind turbine begins to respond to the grid frequency by outputting active power.

[0066] Step 402: Combined with Figure 2, the maximum power P under the current wind speed is obtained. MPPT .

[0067] Step 403: According to the frequency change rate and current wind speed obtained in step 401, select t in formula (5) A <t<t B The load shedding adaptive coefficient k is obtained in the time period adap .

[0068] In step 404 , the load reduction rate at which the fan should operate at this time is calculated using formula (6), and step 406 is executed.

[0069] Step 405: Measure the change in wind speed in seconds and update the load shedding rate according to equation (6).

[0070] Specifically, determine the frequency change between the current moment and the previous moment. If the frequency f t -f t-1 <0, then continue to use t in formula (5) A <t<t B Time period to solve the adaptive coefficient k adap ; If the frequency f t -f t-1 =0, then continue to use t in formula (5) B <t<t C Time period to solve the adaptive coefficient k adap ; If the frequency f t -f t-1 >0, then continue according to formula (5) C Time period to solve the adaptive coefficient k adap . After obtaining the current adaptive coefficient k adap Then, the load reduction rate that the fan should operate at this time is calculated by formula (6).

[0071] Step 406: Solve equation (1) to obtain the active power of the wind turbine that can participate in grid frequency regulation at this time.

[0072] In order to solve the problem of different power generation capabilities of wind turbines in participating in power system frequency regulation due to different wind speeds, the embodiments of the present invention propose a process for wind turbines to participate in grid frequency regulation and load shedding based on adaptive control. The adaptive control method is used to dynamically adjust the wind power load shedding rate according to wind speed, frequency deviation and frequency change rate. The process can select the optimal wind turbine load shedding operation point to ensure that the wind turbine operates at the optimal load shedding point, which can reduce the excess active power stored in the wind power system when participating in grid frequency regulation and load shedding operation.

[0073] Based on similar inventive concepts, an embodiment of the present invention further provides a frequency regulation device for a wind turbine to participate in a power grid. The device can preferably implement each process of the above-mentioned frequency regulation method for a wind turbine to participate in a power grid.

[0074] FIG5 is a structural block diagram of the wind turbine participating in the grid frequency regulation device. As shown in FIG5 , the device includes: an information acquisition unit 1, an adaptive coefficient determination unit 2, a load reduction information determination unit 3 and a frequency regulation unit 4, wherein:

[0075] The information acquisition unit 1 is used to acquire the frequency information of the power grid at the wind turbine grid connection point and the wind speed information of the wind turbine in real time. The frequency information includes: frequency deviation and frequency change rate.

[0076] The adaptive coefficient determination unit 2 is configured to determine a load shedding adaptive coefficient according to the frequency change rate in response to the frequency deviation being greater than a deviation threshold, wherein the load shedding adaptive coefficient is set based on the frequency change rate and wind speed information of the wind turbine.

[0077] Specifically, the adaptive coefficient determining unit 2 determines the load shedding adaptive coefficient according to the frequency change rate and its weight, the wind speed information of the wind turbine and its weight.

[0078] The load shedding information determining unit 3 is configured to determine the load shedding information for the wind turbine to participate in grid frequency regulation based on the determined load shedding adaptive coefficient, the frequency deviation and the wind speed information of the wind turbine.

[0079] The frequency regulation unit 4 is used to perform frequency regulation on the wind turbine participating in the power grid according to the load reduction information and the wind speed information of the wind turbine.

[0080] The frequency information of the power grid at the wind turbine grid connection point and the wind turbine wind speed information are obtained in real time through the information acquisition unit 1. When the frequency deviation is greater than the deviation threshold, the adaptive coefficient determination unit 2 determines the load reduction adaptive coefficient according to the frequency change rate. Subsequently, the load reduction information determination unit 3 determines the load reduction information of the wind turbine participating in the grid frequency regulation according to the determined load reduction adaptive coefficient, the frequency deviation and the wind turbine wind speed information. Thereafter, the frequency regulation unit 4 performs frequency regulation on the wind turbine participating in the grid according to the load reduction information and the wind turbine wind speed information. The load reduction adaptive coefficient of the embodiment of the present invention is set based on the frequency change rate and the wind turbine wind speed information. Different load reduction adaptive coefficients can be set at different stages of the wind turbine participating in the grid frequency regulation. Therefore, the load reduction amount in different frequency regulation stages can be obtained, thereby effectively controlling the load reduction amount of the wind turbine participating in the grid frequency regulation at different times, thereby improving the accuracy of the wind turbine participating in the grid frequency regulation.

[0081] In one embodiment, the information acquisition unit 1 specifically includes: a frequency acquisition module, a frequency deviation determination module, and a frequency change rate determination module, wherein:

[0082] A frequency acquisition module, used to obtain the current frequency of the power grid at the wind turbine connection point in real time;

[0083] A frequency deviation determining module, configured to determine the frequency deviation according to the current frequency and the rated frequency;

[0084] The frequency change rate determination module is used to determine the frequency change rate according to the current frequency and the previous frequency of the power grid at the wind turbine grid connection point.

[0085] In one embodiment, the load shedding information determining unit 3 includes: a maximum power determining module and a load shedding information determining module, wherein:

[0086] a maximum power determination module, configured to determine the maximum power corresponding to the wind speed information of the wind turbine according to the wind speed information of the wind turbine;

[0087] The load shedding information determination module is used to determine the load shedding information of the wind turbine participating in the grid frequency regulation according to the determined load shedding adaptive coefficient, the frequency deviation and the maximum power.

[0088] The frequency modulation unit 4 includes an active power determination module and a frequency modulation module, wherein:

[0089] An active power determination module, configured to determine the active power of the wind turbine participating in grid frequency regulation based on the load reduction information and the maximum power;

[0090] The frequency modulation module is used to perform frequency modulation processing on the wind turbine participating in the power grid according to the determined active power.

[0091] The above-mentioned device also includes: an adaptive coefficient setting unit, which is used to set the load shedding adaptive coefficient in the following manner: in response to the first frequency change rate being less than a predetermined value, setting the load shedding adaptive coefficient according to the first frequency change rate and its first frequency weight, the first wind turbine wind speed information and its first wind speed weight; in response to the second frequency change rate being equal to the predetermined value, setting the load shedding adaptive coefficient according to the second frequency change rate, the second wind turbine wind speed information and the second weight; in response to the third frequency change rate being greater than the predetermined value, setting the load shedding adaptive coefficient according to the third frequency change rate and its third frequency weight, the third wind turbine wind speed information and its third wind speed weight.

[0092] The specific execution process of the above-mentioned units and modules can be found in the description of the above-mentioned method embodiment, which will not be repeated here.

[0093] In actual operation, the above-mentioned units and modules can be provided in combination or individually, and the present invention is not limited thereto.

[0094] This embodiment further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. The electronic device may be a desktop computer, a tablet computer, a mobile terminal, etc., but this embodiment is not limited thereto. In this embodiment, the electronic device may be implemented with reference to the aforementioned method embodiment and the embodiment of the frequency modulation device for wind turbine participation in a power grid, the contents of which are incorporated herein, and any repetitions are omitted.

[0095] An embodiment of the present invention further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the above-mentioned method for frequency regulation of wind turbines participating in a power grid are implemented.

[0096] In summary, the embodiments of the present invention address the issue of varying wind turbine power generation at different wind speeds, resulting in varying capabilities for participating in power system frequency regulation. By doing so, they propose a control scheme for wind turbines participating in grid frequency regulation and load shedding. This scheme dynamically adjusts the optimal wind power load shedding rate based on wind speed, frequency deviation, and frequency change rate using adaptive control. This scheme selects the optimal wind turbine load shedding operating point, ensuring that the wind turbine operates at the optimal load shedding point. This improves the accuracy of wind turbine participation in grid frequency regulation and reduces the amount of excess active power stored in the wind power system during grid frequency regulation and load shedding.

[0097] Specific embodiments are used in the present invention to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas. At the same time, for those skilled in the art, according to the ideas of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A method for frequency modulation of a wind turbine participating in a power grid, characterized in that: The method comprises: Real-time acquisition of the frequency information of the power grid at the wind turbine connection point and the wind speed information of the wind turbine, wherein the frequency information includes: frequency deviation and frequency change rate; In response to the frequency deviation being greater than a deviation threshold, determining a load shedding adaptive coefficient according to the frequency change rate, wherein the load shedding adaptive coefficient is set based on the frequency change rate and wind speed information of the wind turbine; Determining load shedding information for the wind turbine to participate in power grid frequency regulation according to the determined load shedding adaptive coefficient, the frequency deviation and the wind speed information of the wind turbine; The wind turbine is subjected to frequency modulation processing on a power grid in which the wind turbine participates according to the load reduction information and the wind speed information of the wind turbine.

2. The method according to claim 1, characterized in that Determining the load shedding information of the wind turbine participating in the grid frequency modulation according to the determined load shedding adaptive coefficient, the frequency deviation and the wind speed information of the wind turbine includes: Determine the maximum power corresponding to the wind speed information of the wind turbine according to the wind speed information of the wind turbine; The load shedding information of the wind turbine participating in the grid frequency regulation is determined according to the determined load shedding adaptive coefficient, the frequency deviation and the maximum power.

3. The method according to claim 2, characterized in that The frequency modulation process of the wind turbine participating in the power grid according to the load reduction information and the wind speed information of the wind turbine includes: Determining the active power of the wind turbine participating in grid frequency modulation according to the load reduction information and the maximum power; The wind turbine is frequency-modulated in a power grid according to the determined active power.

4. The method according to claim 1, characterized in that Real-time acquisition of wind turbine grid connection point power grid frequency information includes: Acquire the current frequency of the power grid at the wind turbine connection point in real time; Determining the frequency deviation according to the current frequency and the rated frequency; The frequency change rate is determined according to the current frequency and the previous frequency of the power grid at the wind turbine grid connection point.

5. The method according to claim 1, characterized in that Determining the load shedding adaptive coefficient according to the frequency change rate includes: The load reduction adaptive coefficient is determined according to the frequency change rate and its weight, the wind speed information of the wind turbine and its weight.

6. The method according to claim 1, characterized in that Set the load shedding adaptive coefficient as follows: In response to a first frequency change rate being less than a predetermined value, setting a load shedding adaptive coefficient according to the first frequency change rate and its first frequency weight, first wind turbine wind speed information and its first wind speed weight; In response to the second frequency change rate being equal to a predetermined value, setting a load shedding adaptive coefficient according to the second frequency change rate, the second wind turbine wind speed information and a second weight; In response to the third frequency change rate being greater than a predetermined value, a load shedding adaptive coefficient is set according to the third frequency change rate and its third frequency weight, the third wind turbine wind speed information and its third wind speed weight.

7. A frequency modulation device for a wind turbine to participate in a power grid, characterized in that: The device comprises: An information acquisition unit, used to acquire frequency information of the power grid at the wind turbine connection point and wind speed information of the wind turbine in real time, wherein the frequency information includes: frequency deviation and frequency change rate; an adaptive coefficient determination unit, configured to determine a load shedding adaptive coefficient according to the frequency change rate in response to the frequency deviation being greater than a deviation threshold, wherein the load shedding adaptive coefficient is set based on the frequency change rate and wind speed information of the wind turbine; A load shedding information determination unit, used to determine the load shedding information when the wind turbine participates in power grid frequency modulation according to the determined load shedding adaptive coefficient, the frequency deviation and the wind speed information of the wind turbine; A frequency modulation unit is used to perform frequency modulation on the wind turbine participating in the power grid according to the load reduction information and the wind speed information of the wind turbine.

8. The device according to claim 7, characterized in that The load shedding information determining unit comprises: A maximum power determination module, used to determine the maximum power corresponding to the wind speed information of the wind turbine according to the wind speed information of the wind turbine; The load shedding information determination module is used to determine the load shedding information of the wind turbine participating in the grid frequency regulation according to the determined load shedding adaptive coefficient, the frequency deviation and the maximum power.

9. The device according to claim 8, characterized in that The frequency modulation unit comprises: An active power determination module, used to determine the active power of the wind turbine participating in grid frequency modulation according to the load reduction information and the maximum power; The frequency modulation module is used to perform frequency modulation processing on the wind turbine participating in the power grid according to the determined active power.

10. The device according to claim 7, characterized in that The device further includes: an adaptive coefficient setting unit, configured to set the load shedding adaptive coefficient in the following manner: In response to a first frequency change rate being less than a predetermined value, setting a load shedding adaptive coefficient according to the first frequency change rate and its first frequency weight, first wind turbine wind speed information and its first wind speed weight; In response to the second frequency change rate being equal to a predetermined value, setting a load shedding adaptive coefficient according to the second frequency change rate, the second wind turbine wind speed information and a second weight; In response to the third frequency change rate being greater than a predetermined value, a load shedding adaptive coefficient is set according to the third frequency change rate and its third frequency weight, the third wind turbine wind speed information and its third wind speed weight.

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