Wind turbine phased power adjustment method, device, equipment and storage medium

Abstract

The application discloses a wind turbine phased power adjustment method, device, equipment and storage medium, and the method comprises the following steps: calculating the additional frequency modulation power of the wind turbine in the starting frequency modulation period according to the power shortage of the power system and the system wind energy penetration; calculating the additional frequency modulation power of the wind turbine in each subsequent frequency modulation period according to the additional frequency modulation power of the wind turbine in the starting frequency modulation period; wherein the additional frequency modulation power of the wind turbine in the subsequent frequency modulation period is less than the additional frequency modulation power of the wind turbine in the previous frequency modulation period; calculating the output power of the wind turbine in each frequency modulation period and the duration of each frequency modulation period; and adjusting the output power of the wind turbine in a phased manner according to the duration of each frequency modulation period and the output power of the wind turbine in each frequency modulation period. Through the embodiment of the application, the secondary drop of the system frequency after the end of the frequency support can be inhibited.

Description

Technical Field

[0001] This invention relates to the field of power technology, and in particular to a method, apparatus, equipment and storage medium for staged power adjustment of wind turbine generators. Background Technology

[0002] In recent years, wind power, as a clean energy source, has seen increasing penetration in power systems. However, most wind turbines are connected to the power system via power electronic converters. These converters decouple the turbine's output power from the system frequency, leading to a decrease in the overall system inertia after the large-scale replacement of synchronous machines by wind turbines. This has resulted in increasingly prominent frequency stability issues, making the frequency regulation capability of wind turbines a major concern. Currently, wind turbines participate in frequency regulation in two main ways: the first is with backup, where the turbine operates in a reduced-load state through overspeed or pitch angle reduction, releasing reserve power to support the frequency during frequency fluctuations. The second is zero-backup, where the turbine operates in MPPT mode, providing frequency support by releasing rotor kinetic energy. Both methods monitor the frequency at the turbine's grid connection point. When frequency fluctuations are detected, the turbine's frequency controller activates, adding a component related to the system frequency to the turbine's output power, enabling the turbine to respond to changes in system frequency.

[0003] However, current wind turbine frequency regulation methods result in a significant power drop after the frequency support ends, causing a secondary drop in system frequency. Therefore, how to suppress this secondary drop in system frequency is an urgent problem to be solved. Summary of the Invention

[0004] This invention provides a method, apparatus, device, and storage medium for staged power adjustment of wind turbine units, which can suppress the secondary drop in system frequency when the frequency support ends.

[0005] One embodiment of the present invention provides a staged power adjustment method for wind turbines, including: calculating the additional frequency regulation power of wind turbines during the initial frequency regulation period based on the power deficit of the power system and the wind energy penetration rate of the system;

[0006] Based on the additional frequency regulation power of the wind turbines during the initial frequency regulation period, calculate the additional frequency regulation power of the wind turbines during each subsequent frequency regulation period; wherein, the additional frequency regulation power of the wind turbines in the later frequency regulation period is less than the additional frequency regulation power of the wind turbines in the earlier frequency regulation period.

[0007] Calculate the output power of the wind turbine in each frequency regulation period based on the additional frequency regulation power and mechanical power of the wind turbine.

[0008] The duration of each frequency regulation period is calculated based on the additional frequency regulation power of the wind turbine, the inertial time constant of the wind turbine, the upper limit of the wind turbine speed and the lower limit of the wind turbine speed in each frequency regulation period.

[0009] The output power of the wind turbine is adjusted in stages based on the duration of each frequency regulation period and the output power of the wind turbine during each frequency regulation period.

[0010] Furthermore, the determination of the power deficit in the power system specifically includes:

[0011] Construct an analytical relationship between the change in frequency of the local synchronous generator and the change in the center frequency of the power system's inertia.

[0012] The frequency of the local synchronous generator is sampled at two time points, the change in the frequency of the local synchronous generator is calculated, and then the rate of change of the power system inertia center frequency is calculated based on the change in the frequency of the local synchronous generator and the analytical relationship.

[0013] The power deficit of the power system is determined based on the rate of change of the inertia center frequency of the power system.

[0014] Furthermore, based on the additional frequency regulation power of the wind turbines during the initial frequency regulation period, the additional frequency regulation power of the wind turbines during subsequent frequency regulation periods is calculated, specifically including:

[0015] The additional frequency regulation power of the wind turbine is obtained by multiplying the preset coefficient corresponding to each subsequent frequency regulation period with the additional frequency regulation power of the wind turbine in the initial frequency regulation period. The preset coefficient corresponding to each subsequent frequency regulation period is less than 1, and the preset coefficient corresponding to the later frequency regulation period is less than the preset coefficient corresponding to the earlier frequency regulation period.

[0016] Furthermore, based on the additional frequency regulation power and mechanical power of the wind turbines during each frequency regulation period, the output power of the wind turbines during each frequency regulation period is calculated, specifically including:

[0017] The sum of the additional frequency regulation power of the wind turbine and the mechanical power of the wind turbine during each frequency regulation period is calculated to obtain the output power of the wind turbine during each frequency regulation period.

[0018] Based on the above method embodiments, the present invention provides corresponding apparatus embodiments;

[0019] An embodiment of the present invention provides a staged power adjustment device for wind turbine generators, comprising: an initial additional frequency regulation power calculation module, a subsequent additional frequency regulation power calculation module, an output power calculation module, a duration calculation module, and an adjustment module;

[0020] The initial additional frequency regulation power calculation module is used to calculate the additional frequency regulation power of wind turbines during the initial frequency regulation period based on the power deficit of the power system and the wind energy penetration rate of the system.

[0021] The subsequent additional frequency regulation power calculation module is used to calculate the additional frequency regulation power of the wind turbine in each subsequent frequency regulation period based on the additional frequency regulation power of the wind turbine in the initial frequency regulation period; wherein, the additional frequency regulation power of the wind turbine in the later frequency regulation period is less than the additional frequency regulation power of the wind turbine in the previous frequency regulation period.

[0022] The output power calculation module is used to calculate the output power of the wind turbine in each frequency regulation period based on the additional frequency regulation power and mechanical power of the wind turbine in each frequency regulation period.

[0023] The duration calculation module is used to calculate the duration of each frequency regulation period based on the additional frequency regulation power of the wind turbine, the inertial time constant of the wind turbine, the upper limit of the wind turbine speed and the lower limit of the wind turbine speed in each frequency regulation period.

[0024] The adjustment module is used to adjust the output power of the wind turbine in stages according to the duration of each frequency regulation period and the output power of the wind turbine in each frequency regulation period.

[0025] Furthermore, it also includes: a power deficit determination module; the power deficit determination module is used to construct an analytical relationship between the change in the frequency of the local synchronous generator and the change in the center frequency of the power system inertia;

[0026] The frequency of the local synchronous generator is sampled at two time points, the change in the frequency of the local synchronous generator is calculated, and then the rate of change of the power system inertia center frequency is calculated based on the change in the frequency of the local synchronous generator and the analytical relationship.

[0027] The power deficit of the power system is determined based on the rate of change of the inertia center frequency of the power system.

[0028] Furthermore, the subsequent additional frequency regulation power calculation module calculates the additional frequency regulation power of the wind turbines in each subsequent frequency regulation period based on the additional frequency regulation power of the wind turbines during the initial frequency regulation period. Specifically, this includes:

[0029] The additional frequency regulation power of the wind turbine is obtained by multiplying the preset coefficient corresponding to each subsequent frequency regulation period with the additional frequency regulation power of the wind turbine in the initial frequency regulation period. The preset coefficient corresponding to each subsequent frequency regulation period is less than 1, and the preset coefficient corresponding to the later frequency regulation period is less than the preset coefficient corresponding to the earlier frequency regulation period.

[0030] Furthermore, the output power calculation module calculates the output power of the wind turbine in each frequency regulation period based on the additional frequency regulation power and the mechanical power of the wind turbine. Specifically, this includes:

[0031] The sum of the additional frequency regulation power of the wind turbine and the mechanical power of the wind turbine during each frequency regulation period is calculated to obtain the output power of the wind turbine during each frequency regulation period.

[0032] Based on the above method embodiments, the present invention provides a corresponding device embodiment;

[0033] One embodiment of the present invention provides an apparatus comprising: a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor executes the computer program to implement the wind turbine staged power adjustment method described in any of the above embodiments.

[0034] Based on the above method embodiments, the present invention provides a corresponding storage medium embodiment;

[0035] One embodiment of the present invention provides a storage medium including a stored computer program, wherein when the computer program is executed by a processor, it controls the device where the computer-readable storage medium is located to execute the wind turbine staged power adjustment method described in any embodiment.

[0036] The following beneficial effects can be achieved by implementing the embodiments of the present invention:

[0037] This invention provides a method, apparatus, device, and storage medium for staged power adjustment of wind turbines. The method calculates the additional frequency regulation power of wind turbines during the initial frequency regulation period based on the power deficit in the power system and the system's wind energy penetration rate. Then, it calculates the additional frequency regulation power of wind turbines for subsequent frequency regulation periods based on the additional frequency regulation power of the wind turbines during the initial period, ensuring that the additional frequency regulation power of wind turbines in each subsequent period is less than that in the previous period. Next, it calculates the output power of wind turbines and the duration of each frequency regulation period. Finally, it adjusts the output power of wind turbines in stages based on the duration of each frequency regulation period and the output power of wind turbines during each period. Compared with existing technologies, in this invention, the additional frequency regulation power gradually decreases during each frequency regulation period, causing the output power of wind turbines to gradually decrease, avoiding a sharp drop in output power after the frequency support ends, thereby suppressing a secondary drop in system frequency after the frequency support ends. Attached Figure Description

[0038] Figure 1 This is a schematic flowchart of a staged power adjustment method for wind turbine generators provided in an embodiment of the present invention.

[0039] Figure 2 This is a schematic diagram of a staged power adjustment device for a wind turbine provided in an embodiment of the present invention. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] like Figure 1 As shown, one embodiment of the present invention provides a method for staged power adjustment of a wind turbine, comprising at least:

[0042] Step S101: Calculate the additional frequency regulation power of wind turbines during the initial frequency regulation period based on the power system power deficit and the system wind energy penetration rate.

[0043] Step S102: Calculate the additional frequency regulation power of the wind turbine in each subsequent frequency regulation period based on the additional frequency regulation power of the wind turbine in the initial frequency regulation period; wherein, the additional frequency regulation power of the wind turbine in the later frequency regulation period is less than the additional frequency regulation power of the wind turbine in the previous frequency regulation period.

[0044] Step S103: Calculate the output power of the wind turbine in each frequency regulation period based on the additional frequency regulation power and mechanical power of the wind turbine.

[0045] Step S104: Calculate the duration of each frequency regulation period based on the additional frequency regulation power of the wind turbine, the inertial time constant of the wind turbine, the upper limit of the wind turbine speed and the lower limit of the wind turbine speed in each frequency regulation period.

[0046] Step S105: Adjust the output power of the wind turbine in stages according to the duration of each frequency regulation period and the output power of the wind turbine in each frequency regulation period.

[0047] For step S101: First, it is necessary to determine the power system power deficit. In existing technologies, this is generally done by detecting the frequency at the grid connection point of the wind turbine, then calculating the power system power deficit based on the frequency changes at the grid connection point, and then transmitting the calculated power system power deficit to the local control equipment. The local control equipment then performs subsequent calculations based on the received power system power deficit. This method requires communication between the local control equipment and the detection equipment at the grid connection point, which often results in slow response times due to communication delays.

[0048] In this invention, the power deficit of the power system can be directly obtained by using the above-mentioned prior art. However, in order to improve the response rate, this invention proposes a method for determining the power deficit of the power system without communication.

[0049] In a preferred embodiment, determining the power deficit of the power system specifically includes: constructing an analytical relationship between the change in the frequency of the local synchronous generator and the change in the center frequency of the power system inertia; sampling the frequency of the local synchronous generator at two time points, calculating the change in the frequency of the local synchronous generator, and then calculating the rate of change of the center frequency of the power system inertia based on the change in the frequency of the local synchronous generator and the analytical relationship; and determining the power deficit of the power system based on the rate of change of the center frequency of the power system inertia.

[0050] Specifically, taking a power system composed of two power supply areas as an example, and considering one of the power supply areas as the local area, the analytical relationship between the change in the frequency of the local synchronous generator and the change in the center frequency of the power system's inertia is as follows:

[0051]

[0052] Where Δf1 is the change in the frequency of the local synchronous generator, Δf COI H1 is the change in frequency of the local synchronous generator, H2 is the inertial time constant of the local synchronous generator, ω is the frequency of the low-frequency oscillation between the synchronous generators in the two regions, and t is the time elapsed since the start of the disturbance.

[0053]

[0054] Where, ω s Let a1 and a2 be the system synchronization angular frequency, and a1 and a2 be constants related to the operating state of the synchronous generator.

[0055] b is a constant determined based on the inertial time constant of the synchronous generators in the two regions and the operating state of the synchronous generators in the two regions. Its specific calculation formula is as follows:

[0056]

[0057] Wherein, ΔP L This is due to a power deficit in the system.

[0058] After constructing the above analytical relationship, the local synchronous generator frequency is sampled at two time points, t111161 and t211131. The local frequency changes at each sampling time are as follows:

[0059]

[0060]

[0061] The expression for the rate of change of the center frequency of inertia of a power system is:

[0062]

[0063] Therefore, the power deficit in the power system is:

[0064] Wherein, ΔP L This is for the power deficit in the power system.

[0065] After calculating the power deficit in the power system, the product of the power deficit and the system's wind energy penetration rate is calculated to obtain the additional frequency regulation power of the wind turbines during the initial frequency regulation period; the specific formula is as follows:

[0066] ΔP1=KΔP L Where ΔP1 is the additional frequency regulation power of the wind turbine during the initial frequency regulation period, and K is the wind energy penetration rate of the system.

[0067] For step S102, in a preferred embodiment, the additional frequency regulation power of the wind turbine in each subsequent frequency regulation period is calculated based on the additional frequency regulation power of the wind turbine during the initial frequency regulation period, specifically including:

[0068] The additional frequency regulation power of the wind turbine is obtained by multiplying the preset coefficient corresponding to each subsequent frequency regulation period with the additional frequency regulation power of the wind turbine in the initial frequency regulation period. The preset coefficient corresponding to each subsequent frequency regulation period is less than 1, and the preset coefficient corresponding to the later frequency regulation period is less than the preset coefficient corresponding to the earlier frequency regulation period.

[0069] Indicatively, this invention divides the frequency regulation period into three time periods: the initial frequency regulation period, the intermediate frequency regulation period, and the final frequency regulation period. The preset coefficient for the intermediate frequency regulation period can be set to 0.5. The preset coefficient for the final frequency regulation period can be 0.25. Therefore, the additional frequency regulation power of the wind turbine in each time period is: ΔP1 for the initial frequency regulation period, 0.5ΔP1 for the intermediate frequency regulation period, and 0.25ΔP1 for the final frequency regulation period.

[0070] For step S103, in a preferred embodiment, the output power of the wind turbine in each frequency regulation period is calculated based on the additional frequency regulation power and the mechanical power of the wind turbine in each frequency regulation period. Specifically, this includes: calculating the sum of the additional frequency regulation power and the mechanical power of the wind turbine in each frequency regulation period to obtain the output power of the wind turbine in each frequency regulation period.

[0071] Taking the three frequency regulation periods mentioned above as examples, the final output power of the wind turbines in each frequency regulation period is:

[0072]

[0073] Among them, PWT1 The output power of the wind turbine during the initial frequency regulation period, P WT2 For the output power of wind turbines during the intermediate frequency regulation period, P WT3 To terminate the output power of the wind turbine during the frequency regulation period, ω r ω represents the real-time rotational speed of the wind turbine. r0 ω represents the initial speed of the wind turbine (which is also the upper limit of the wind turbine's speed during the initial frequency regulation period). r1 ω represents the lower limit of the wind turbine's speed during the initial frequency regulation period (which is also the upper limit of the wind turbine's speed during the intermediate frequency regulation period). r2 ω represents the lower limit of wind turbine speed during the intermediate frequency regulation period (which is also the upper limit of wind turbine speed during the final frequency regulation period). rmin The lower limit of wind turbine speed during the frequency regulation period.

[0074] For step S104, illustratively, taking the above three frequency modulation periods as an example, the duration of each frequency modulation period is as follows:

[0075]

[0076] Where t1 is the duration of the wind turbine during the initial frequency regulation period, t2 is the duration of the wind turbine during the intermediate frequency regulation period, and t3 is the duration of the wind turbine during the final frequency regulation period, H W Let be the inertial time constant of the wind turbine.

[0077] For step S105, the output power of the wind turbine can be adjusted according to the duration of each frequency regulation period calculated in the above steps and the output power of the wind turbine in each frequency regulation period.

[0078] By implementing the above embodiments of the present invention, the additional frequency regulation power during each frequency regulation period is gradually reduced, so that the output power of the wind turbine during each frequency regulation period is gradually reduced, avoiding a cliff-like drop in the output power of the wind turbine after the frequency support ends, thereby suppressing the second drop in system frequency after the frequency support ends.

[0079] Based on the above method embodiments, the present invention provides corresponding apparatus embodiments;

[0080] like Figure 2 As shown, an embodiment of the present invention provides a staged power adjustment device for wind turbine generators, including: an initial additional frequency regulation power calculation module 1, a subsequent additional frequency regulation power calculation module 2, an output power calculation module 3, a duration calculation module 4, and an adjustment module 5;

[0081] The initial additional frequency regulation power calculation module 1 is used to calculate the additional frequency regulation power of wind turbines during the initial frequency regulation period based on the power deficit of the power system and the wind energy penetration rate of the system.

[0082] The subsequent additional frequency regulation power calculation module 2 is used to calculate the additional frequency regulation power of the wind turbine in each subsequent frequency regulation period based on the additional frequency regulation power of the wind turbine in the initial frequency regulation period; wherein, the additional frequency regulation power of the wind turbine in the later frequency regulation period is less than the additional frequency regulation power of the wind turbine in the previous frequency regulation period.

[0083] The output power calculation module 3 is used to calculate the output power of the wind turbine in each frequency regulation period based on the additional frequency regulation power and mechanical power of the wind turbine in each frequency regulation period.

[0084] The duration calculation module 4 is used to calculate the duration of each frequency regulation period based on the additional frequency regulation power of the wind turbine, the inertial time constant of the wind turbine, the upper limit of the wind turbine speed and the lower limit of the wind turbine speed in each frequency regulation period.

[0085] The adjustment module 5 is used to adjust the output power of the wind turbine in stages according to the duration of each frequency regulation period and the output power of the wind turbine in each frequency regulation period.

[0086] In a preferred embodiment, the system further includes a power deficit determination module 6; the power deficit determination module 6 is used to construct an analytical relationship between the change in the local synchronous generator frequency and the change in the power system inertia center frequency; sample the local synchronous generator frequency at two time points, calculate the change in the local synchronous generator frequency, and then calculate the power system inertia center frequency change rate based on the change in the local synchronous generator frequency and the analytical relationship; and determine the power system power deficit based on the power system inertia center frequency change rate.

[0087] In a preferred embodiment, the subsequent additional frequency regulation power calculation module 2 calculates the additional frequency regulation power of the wind turbine in each subsequent frequency regulation period based on the additional frequency regulation power of the wind turbine in the initial frequency regulation period, specifically including:

[0088] The additional frequency regulation power of the wind turbine is obtained by multiplying the preset coefficient corresponding to each subsequent frequency regulation period with the additional frequency regulation power of the wind turbine in the initial frequency regulation period. The preset coefficient corresponding to each subsequent frequency regulation period is less than 1, and the preset coefficient corresponding to the later frequency regulation period is less than the preset coefficient corresponding to the earlier frequency regulation period.

[0089] In a preferred embodiment, the output power calculation module 3 calculates the output power of the wind turbine in each frequency regulation period based on the additional frequency regulation power and the mechanical power of the wind turbine, specifically including:

[0090] The sum of the additional frequency regulation power of the wind turbine and the mechanical power of the wind turbine during each frequency regulation period is calculated to obtain the output power of the wind turbine during each frequency regulation period.

[0091] Based on the above method embodiments, the present invention provides a corresponding device embodiment;

[0092] One embodiment of the present invention provides a device comprising: a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor executes the computer program to implement the wind turbine staged power adjustment method according to any embodiment of the present invention.

[0093] Based on the above method embodiments, the present invention provides a corresponding storage medium embodiment;

[0094] One embodiment of the present invention provides a storage medium including a stored computer program, wherein when the computer program is executed by a processor, the device where the computer-readable storage medium is located controls the execution of the wind turbine staged power adjustment method according to any embodiment of the present invention.

[0095] It should be noted that the device may be a desktop computer, laptop, handheld computer, or cloud server, etc. The device may include, but is not limited to, processors and memory.

[0096] The processor referred to can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0097] The storage medium is a computer-readable storage medium. When the computer program stored in the computer-readable storage medium is executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electrical carrier signals and telecommunication signals.

[0098] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Furthermore, in the accompanying drawings of the device embodiments provided by this invention, the connection relationships between modules indicate that they have communication connections, which can be specifically implemented as one or more communication buses or signal lines. Those skilled in the art can understand and implement this without creative effort.

[0099] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for staged power adjustment of a wind turbine generator, characterized in that, include: The additional frequency regulation power of wind turbines during the initial frequency regulation period is calculated based on the power system power deficit and the system wind energy penetration rate. Specifically, this includes: calculating the product of the preset coefficients corresponding to each subsequent frequency regulation period and the additional frequency regulation power of wind turbines during the initial frequency regulation period to obtain the additional frequency regulation power of wind turbines during each subsequent frequency regulation period; wherein the preset coefficients corresponding to each subsequent frequency regulation period are all less than 1, and in each subsequent frequency regulation period, the preset coefficient corresponding to the later frequency regulation period is less than the preset coefficient corresponding to the earlier frequency regulation period; the determination of the power system power deficit specifically includes: constructing an analytical relationship between the change in local synchronous generator frequency and the change in the power system inertia center frequency; sampling the local synchronous generator frequency at two times, calculating the change in the local synchronous generator frequency, and then calculating the power system inertia center frequency change rate based on the change in the local synchronous generator frequency and the analytical relationship; and determining the power system power deficit based on the power system inertia center frequency change rate. Based on the additional frequency regulation power of the wind turbines during the initial frequency regulation period, calculate the additional frequency regulation power of the wind turbines during each subsequent frequency regulation period; wherein, the additional frequency regulation power of the wind turbines in the later frequency regulation period is less than the additional frequency regulation power of the wind turbines in the earlier frequency regulation period. Calculate the output power of the wind turbine in each frequency regulation period based on the additional frequency regulation power and mechanical power of the wind turbine. The duration of each frequency regulation period is calculated based on the additional frequency regulation power of the wind turbine, the inertial time constant of the wind turbine, the upper limit of the wind turbine speed and the lower limit of the wind turbine speed in each frequency regulation period. The output power of the wind turbine is adjusted in stages based on the duration of each frequency regulation period and the output power of the wind turbine during each frequency regulation period.

2. The staged power adjustment method for wind turbine generators as described in claim 1, characterized in that, Based on the additional frequency regulation power and mechanical power of the wind turbines during each frequency regulation period, the output power of the wind turbines during each frequency regulation period is calculated, specifically including: The sum of the additional frequency regulation power of the wind turbine and the mechanical power of the wind turbine during each frequency regulation period is calculated to obtain the output power of the wind turbine during each frequency regulation period.

3. A staged power adjustment device for wind turbine generators, characterized in that, include: The module includes an initial additional frequency modulation power calculation module, a subsequent additional frequency modulation power calculation module, an output power calculation module, a duration calculation module, and an adjustment module. The initial additional frequency regulation power calculation module is used to calculate the additional frequency regulation power of wind turbines during the initial frequency regulation period based on the power system power deficit and the system wind energy penetration rate. Specifically, it includes: calculating the product of the preset coefficients corresponding to each subsequent frequency regulation period and the additional frequency regulation power of the wind turbines during the initial frequency regulation period to obtain the additional frequency regulation power of the wind turbines during each subsequent frequency regulation period; wherein the preset coefficients corresponding to each subsequent frequency regulation period are all less than 1, and in each subsequent frequency regulation period, the preset coefficient corresponding to the later frequency regulation period is less than the preset coefficient corresponding to the earlier frequency regulation period; wherein, the determination of the power system power deficit specifically includes: constructing an analytical relationship between the change in local synchronous generator frequency and the change in the power system inertia center frequency; sampling the local synchronous generator frequency at two times, calculating the change in the local synchronous generator frequency, and then calculating the power system inertia center frequency change rate based on the change in the local synchronous generator frequency and the analytical relationship; and determining the power system power deficit based on the power system inertia center frequency change rate. The subsequent additional frequency regulation power calculation module is used to calculate the additional frequency regulation power of the wind turbine in each subsequent frequency regulation period based on the additional frequency regulation power of the wind turbine in the initial frequency regulation period; wherein, the additional frequency regulation power of the wind turbine in the later frequency regulation period is less than the additional frequency regulation power of the wind turbine in the previous frequency regulation period. The output power calculation module is used to calculate the output power of the wind turbine in each frequency regulation period based on the additional frequency regulation power and mechanical power of the wind turbine in each frequency regulation period. The duration calculation module is used to calculate the duration of each frequency regulation period based on the additional frequency regulation power of the wind turbine, the inertial time constant of the wind turbine, the upper limit of the wind turbine speed and the lower limit of the wind turbine speed in each frequency regulation period. The adjustment module is used to adjust the output power of the wind turbine in stages according to the duration of each frequency regulation period and the output power of the wind turbine in each frequency regulation period.

4. The wind turbine staged power adjustment device as described in claim 3, characterized in that, The output power calculation module calculates the output power of the wind turbine in each frequency regulation period based on the additional frequency regulation power and the mechanical power of the wind turbine. Specifically, it includes: The sum of the additional frequency regulation power of the wind turbine and the mechanical power of the wind turbine during each frequency regulation period is calculated to obtain the output power of the wind turbine during each frequency regulation period.

5. A staged power adjustment device for wind turbine generators, characterized in that, include: A processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor, when executing the computer program, implements the wind turbine staged power adjustment method as described in any one of claims 1 to 2.

6. A storage medium, characterized in that, The storage medium includes a stored computer program, wherein, when the computer program is executed by a processor, it controls the device containing the computer-readable storage medium to perform the wind turbine staged power adjustment method as described in any one of claims 1 to 2.

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