A wind farm primary frequency modulation parameter fitting method and system

Abstract

This invention provides a method for fitting primary frequency regulation parameters of a wind farm, comprising: conducting over-frequency response tests based on operating conditions of different power levels to obtain over-frequency dynamic response data corresponding to each operating condition; fitting the over-frequency response data of each power level operating condition separately; conducting under-frequency response tests based on operating conditions of different power levels to obtain under-frequency dynamic response data corresponding to each operating condition; and fitting the under-frequency response data of each power level operating condition separately; wherein, the operating conditions of each power level are divided by rated power; and simultaneously considering modeling and fitting both over-frequency disturbances and under-frequency disturbances separately, so that the method for fitting primary frequency regulation model parameters of a wind farm meets the modeling and simulation requirements for wind farm frequency regulation.

Description

Technical Field

[0001] This invention belongs to the field of active frequency control and relates to a method and system for fitting primary frequency regulation parameters of a wind farm. Background Technology

[0002] As a green and clean energy source, wind power has seen rapid growth in installed capacity. With its rapid development, wind power has become the main power source in the system, urgently requiring wind power to participate in the primary frequency response of the power grid and improve the frequency security and stability of the grid.

[0003] Currently, there are relevant research results in wind turbine primary frequency regulation control strategies, wind farm primary frequency regulation control architectures, and command issuance strategies. Related primary frequency regulation control systems have been put into operation in the field, and wind farm participation in primary frequency regulation trials has been carried out in multiple provinces and regions. To effectively analyze the frequency regulation characteristics of wind farms and scientifically evaluate the actual effect of wind farm participation in frequency regulation, it is necessary to obtain the primary frequency regulation model and parameters of the wind farm and simulate its dynamic response through simulation. However, in terms of primary frequency regulation model parameter fitting, existing research mainly focuses on fitting the primary frequency regulation parameters of traditional synchronous generators, while research on fitting the primary frequency regulation model parameters of wind farms needs further in-depth study. Since wind farm operating conditions are highly variable, it is also necessary to consider the dynamic response under different operating conditions simultaneously within a single set of frequency regulation model parameters. Summary of the Invention

[0004] To address the issue that existing research methods for fitting parameters of primary frequency regulation models for wind farms still need improvement, this invention provides a method for fitting primary frequency regulation parameters of wind farms, with the specific steps as follows:

[0005] Based on the operating conditions of different power levels, ramp overfrequency response tests were conducted to obtain overfrequency dynamic response data corresponding to each operating condition.

[0006] The ramp overfrequency response data for each power level operating condition were fitted separately;

[0007] Based on different power levels of operating conditions, ramp underfrequency response tests were conducted to obtain underfrequency dynamic response data corresponding to each operating condition.

[0008] The ramp underfrequency response data for each power level operating condition were fitted separately;

[0009] The operating conditions for each power level are divided according to the rated power.

[0010] Preferably, the ramp overfrequency response test based on different power levels to obtain overfrequency dynamic response data corresponding to each operating condition includes:

[0011] Based on the operating conditions of each power level of the wind farm, a frequency signal with a constant slope increase is injected into the primary frequency regulation control device of the wind farm to obtain the positive value of the frequency regulation dead zone when the active power of the wind farm begins to decrease under each power level operating condition, the frequency regulation end point value when the active power of the wind farm no longer decreases, and the output reduction limit.

[0012] Preferably, the step of fitting the ramp overfrequency response data for each power level operating condition includes:

[0013] Under the operating conditions of each power level of the wind farm, based on the positive value of the frequency regulation dead zone when the active power of the wind farm begins to decrease, the value of the frequency regulation end point when the active power of the wind farm no longer decreases, and the power reduction limit, the average value of the positive value of the frequency regulation dead zone, the average value of the frequency regulation end point, and the average value of the power reduction limit for excessive frequency are obtained.

[0014] Based on the average value of the positive value of the frequency dead zone of the overfrequency, the average value of the frequency end point of the overfrequency, and the average value of the output reduction limit of the overfrequency, the slope of the active frequency droop curve and the output reduction droop rate of the overfrequency are calculated.

[0015] Preferably, the slope underfrequency response test based on different power levels to obtain underfrequency dynamic response data corresponding to each operating condition includes:

[0016] Based on the operating conditions of each power level of the wind farm, a frequency signal with a constant slope decrease is injected into the primary frequency regulation control device of the wind farm to obtain the negative value of the frequency regulation dead zone when the active power of the wind farm begins to rise, the frequency regulation end point value when the active power of the wind farm no longer rises, and the output limit for each power level operating condition.

[0017] Preferably, the step of fitting the ramp underfrequency response data for each power level operating condition includes:

[0018] Under the operating conditions of each power level of the wind farm, based on the negative value of the frequency regulation dead zone when the active power of the wind farm begins to rise, the value of the frequency regulation end point when the active power of the wind farm no longer rises, and the power output limit, the average value of the negative value of the frequency regulation dead zone, the average value of the frequency regulation end point, and the average value of the power output limit for under-frequency conditions are obtained.

[0019] Based on the average value of the negative value of the frequency dead zone of the under-frequency modulation, the average value of the frequency modulation end point of the under-frequency modulation, and the average value of the boost power limit, the slope of the active frequency droop curve and the boost power droop rate of the under-frequency modulation are calculated.

[0020] Preferably, the formula for calculating the slope of the over-frequency active frequency droop curve is as follows:

[0021]

[0022] In the formula, D dn P represents the slope of the active-frequency droop curve for excessive frequency in a wind farm. dnlim f is the average value of the output reduction limit under various power level operating conditions. Hend f is the average value of the frequency regulation termination point value under the operating conditions of each power level. Hdb This represents the average positive value of the frequency dead zone under operating conditions at each power level.

[0023] Preferably, the formula for calculating the output droop rate is as follows:

[0024]

[0025] In the formula, δ dn To reduce the output droop rate, f N For a rated frequency of 50Hz, P N D is the rated power of the wind farm. dn This represents the slope of the active-frequency droop curve of the wind farm.

[0026] Preferably, the formula for calculating the slope of the under-frequency active frequency droop curve is as follows:

[0027]

[0028] In the formula, D up P represents the slope of the active frequency droop curve for underfrequency applications. uplim f is the average value of the lift-off limit under operating conditions at each power level. Ldb f is the average of the negative values ​​of the underfrequency dead zone under various power level operating conditions. Lend This represents the average value of the frequency modulation termination point value under the operating conditions of each power level.

[0029] Preferably, the formula for calculating the lift output droop rate is as follows:

[0030]

[0031] In the formula, δ up For the output droop rate, D up f is the slope of the active frequency droop curve for underfrequency applications. N For a rated frequency of 50Hz, P N This refers to the rated power of the wind farm.

[0032] Preferably, the method further includes:

[0033] Based on the parameters obtained from the fitting, the primary frequency regulation response curve of the wind farm is obtained with frequency on the horizontal axis and power on the vertical axis.

[0034] Preferably, the operating conditions for the different power levels include:

[0035] The power range of the first-class power operating condition is 70% of the rated power;

[0036] The power range for the second-class power operating condition is 40% to 60% of the rated power;

[0037] The power range for the third-level power condition is 20% to 30% of the rated power.

[0038] Based on the same concept, the present invention provides a wind farm primary frequency regulation parameter fitting system, including: an over-frequency data acquisition module, an over-frequency fitting module, an under-frequency data acquisition module, and an under-frequency fitting module;

[0039] The overfrequency data acquisition module is used to conduct ramp overfrequency response tests based on operating conditions of different power levels, and obtain overfrequency dynamic response data corresponding to each operating condition.

[0040] The overfrequency fitting module is used to fit the ramp overfrequency response data of each power level operating condition.

[0041] The underfrequency data acquisition module is used to conduct ramp underfrequency response tests based on operating conditions at different power levels, and obtain underfrequency dynamic response data corresponding to each operating condition.

[0042] The underfrequency fitting module is used to fit the ramp underfrequency response data of each power level operating condition.

[0043] The operating conditions for each power level are divided according to the rated power.

[0044] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0045] 1. This invention provides a method for fitting primary frequency regulation parameters of a wind farm, comprising: conducting slope over-frequency response tests based on operating conditions of different power levels to obtain over-frequency dynamic response data corresponding to each operating condition; fitting the slope over-frequency response data of each power level operating condition separately; conducting slope under-frequency response tests based on operating conditions of different power levels to obtain under-frequency dynamic response data corresponding to each operating condition; fitting the slope under-frequency response data of each power level operating condition separately; wherein, the operating conditions of each power level are divided by rated power; the parameter fitting method of this invention simultaneously considers modeling and fitting both over-frequency disturbances and under-frequency disturbances, enabling the primary frequency regulation model parameter fitting method of the wind farm to meet the modeling and simulation requirements of wind farm frequency regulation; and providing model parameter support for the safe and stable operation of the power grid.

[0046] 2. This invention provides a method and system for fitting primary frequency regulation parameters in wind farms, which can adapt to the changing operating conditions of wind farms, fully stimulate the dynamic response of the primary frequency regulation control system, and quickly complete the parameter fitting work. Attached Figure Description

[0047] Figure 1 A flowchart of the method provided by the present invention;

[0048] Figure 2 A flowchart of the wind farm primary frequency regulation model parameter fitting method provided in this embodiment of the invention;

[0049] Figure 3 The ramp overfrequency response test curve provided in the embodiment of the present invention;

[0050] Figure 4 The slope underfrequency response test curve provided in the embodiment of the present invention;

[0051] Figure 5 The wind farm primary frequency regulation response curve provided in the embodiments of the present invention;

[0052] Figure 6 The system structure diagram provided for this invention. Detailed Implementation

[0053] The embodiments of the present invention will be further described with reference to the accompanying drawings.

[0054] Example 1:

[0055] This invention provides a method for fitting primary frequency regulation parameters in wind farms, combined with... Figure 1 The method flowchart is provided below, with specific steps as follows:

[0056] Step 1: Conduct ramp overfrequency response tests based on operating conditions at different power levels to obtain overfrequency dynamic response data corresponding to each operating condition;

[0057] Step 2: Fit the ramp overfrequency response data for each power level operating condition;

[0058] Step 3: Conduct ramp underfrequency response tests based on operating conditions at different power levels to obtain underfrequency dynamic response data corresponding to each operating condition;

[0059] Step 4: Fit the ramp underfrequency response data for each power level operating condition;

[0060] Step 1: Based on operating conditions at different power levels, conduct ramp overfrequency response tests to obtain overfrequency dynamic response data corresponding to each operating condition, specifically including:

[0061] The wind farm's AGC is set to operate in a constant active power control mode. In this embodiment, the wind farm's power level operation conditions are taken as three power level operation conditions: high power, medium power, and low power. The high power condition refers to the wind farm's output power being 70% of the rated power, the medium power condition refers to the wind farm's output power being 40% to 60% of the rated power, and the low power condition refers to the wind farm's output power being 20% ​​to 30% of the rated power.

[0062] Combination Figure 2 This document introduces the flowchart of the parameter fitting method for the primary frequency regulation model of a wind farm. Step two involves conducting a ramp overfrequency response test to fit the overfrequency model parameters. Under high-power conditions, a frequency signal with a constant ramp is injected into the frequency measurement terminal of the primary frequency regulation control device of the wind farm. The starting point of the frequency is 50Hz, and the maximum frequency value ranges from 51 to 52Hz. The rate of change of the frequency is set to 0.005Hz / s. The active power at the grid connection point of the wind farm is measured during the frequency change. The moment when the active power of the wind farm begins to decrease is recorded; the frequency value at this moment is the positive value of the frequency regulation dead zone, f. Hdb1 When the active power of the wind farm no longer decreases, the frequency value at this moment is the frequency regulation termination point f. Hend1 The active power reduction value of the wind farm is the output reduction limit P. dnlim1 .

[0063] Under medium power conditions, repeat the above steps to measure the positive value f of the frequency modulation dead zone. Hdb2 FM end point f Hend2 and reduce output limit P dnlim2 .

[0064] Under low-power conditions, repeat the above steps to measure the positive value f of the frequency modulation dead zone. Hdb3 FM end point f Hend3 and reduce output limit P dnlim3 .

[0065] Step 2: Fit the ramp overfrequency response data for each power level operating condition, specifically including:

[0066] Under overfrequency conditions, the dead zone of the frequency modulation model is positive, f. Hdb Take the average value under three working conditions

[0067]

[0068] The end point f of the frequency modulation model Hend Take the average value under three working conditions

[0069]

[0070] Reduced output limit P dnlim Take the average value under three working conditions

[0071]

[0072] Combination Figure 3 The slope overfrequency response test curve of the wind farm is introduced, and the slope D of the active power-frequency droop curve is shown. dn for

[0073]

[0074] Reduced output droop rate δ dn for

[0075]

[0076] In the formula, f N For a rated frequency of 50Hz, P N This refers to the rated power of the wind farm.

[0077] The slope over-frequency response test should be carried out under sufficient wind conditions. Under high-power conditions, the maximum output active power of the wind farm should be greater than 70% of the rated power; under medium-power conditions, the maximum output active power of the wind farm should be greater than 60% of the rated power; and under low-power conditions, the maximum output active power of the wind farm should be greater than 30% of the rated power.

[0078] Step 3: Conduct ramp underfrequency response tests based on operating conditions at different power levels to obtain underfrequency dynamic response data corresponding to each operating condition, specifically including:

[0079] A slope-based underfrequency response test was conducted to fit the underfrequency model parameters. Under high-power conditions, a frequency signal with a constant slope decreasing was injected into the frequency measurement terminal of the wind farm's primary frequency regulation control device. The starting point of the frequency was 50Hz, and the minimum frequency value ranged from 48 to 49Hz. The rate of frequency decrease was set to 0.005Hz / s. The active power at the wind farm's grid connection point was measured during the frequency change process. The moment when the wind farm's active power began to rise was recorded; the frequency value at this moment was the negative value of the frequency regulation dead zone, f. Ldb1 When the active power of the wind farm no longer increases, the frequency value at this moment is the frequency regulation termination point f. Lend1 The active power rise value of the wind farm is the output power limit P. uplim1 .

[0080] Under medium power conditions, repeat the above steps to measure the negative value f of the frequency modulation dead zone. Ldb2 FM end point f Lend2 and reduce output limit P uplim2 .

[0081] Under low-power conditions, repeat the above steps to measure the negative value f of the frequency modulation dead zone. Ldb3 FM end point fLend3 and reduce output limit P uplim3 .

[0082] Step 4: Fit the ramp underfrequency response data for each power level operating condition, specifically including:

[0083] In the underfrequency state, the dead zone negative value f of the frequency modulation model Ldb Take the average value under three working conditions

[0084]

[0085] The end point f of the frequency modulation model Lend Take the average value under three working conditions

[0086]

[0087] Power output limit P uplim Take the average value under three working conditions

[0088]

[0089] Combination Figure 4 The slope underfrequency response test curve of the wind farm is introduced, and the slope D of the active-frequency droop curve is shown. up for

[0090]

[0091] Lift output droop rate δ up for

[0092]

[0093] The slope underfrequency response test should be carried out under sufficient wind conditions. Under high power conditions, the maximum output active power of the wind farm should be greater than 90% of the rated power; under medium power conditions, the maximum output active power of the wind farm should be greater than 80% of the rated power; and under low power conditions, the maximum output active power of the wind farm should be greater than 50% of the rated power.

[0094] Based on the fitted parameters, plot the primary frequency regulation response curve of the wind farm. Combined with... Figure 5 The primary frequency regulation response curve of the wind farm is introduced, with the horizontal axis representing frequency and the vertical axis representing power.

[0095] This invention takes into account the effects of frequency regulation dead zone and saturation limiting, and further improves the parameter fitting method of primary frequency regulation model of wind farm, which can meet the modeling and simulation requirements of wind farm frequency regulation.

[0096] Example 2:

[0097] Based on the same concept, this invention provides a wind farm primary frequency regulation parameter fitting system, combined with Figure 6 The system architecture diagram is introduced, including: overfrequency data acquisition module, overfrequency fitting module, underfrequency data acquisition module, and underfrequency fitting module;

[0098] The overfrequency data acquisition module is used to conduct ramp overfrequency response tests based on operating conditions of different power levels, and obtain overfrequency dynamic response data corresponding to each operating condition.

[0099] The overfrequency fitting module is used to fit the ramp overfrequency response data of each power level operating condition.

[0100] The underfrequency data acquisition module is used to conduct ramp underfrequency response tests based on operating conditions at different power levels, and obtain underfrequency dynamic response data corresponding to each operating condition.

[0101] The underfrequency fitting module is used to fit the ramp underfrequency response data of each power level operating condition.

[0102] The operating conditions for each power level are divided according to the rated power.

[0103] The over-frequency data acquisition module includes: an over-frequency response data submodule;

[0104] The overfrequency response data submodule is used to inject frequency signals with a constant slope increase into the primary frequency regulation control device of the wind farm based on the operating conditions of each power level of the wind farm, so as to obtain the positive value of the frequency regulation dead zone when the active power of the wind farm begins to decrease, the value of the frequency regulation end point when the active power of the wind farm no longer decreases, and the output reduction limit for each power level operating condition.

[0105] The over-frequency fitting module includes: an over-frequency average value submodule and an over-frequency calculation submodule;

[0106] The over-frequency averaging submodule is used to calculate the average value of the over-frequency averaging dead zone, the average value of the over-frequency averaging end point, and the average value of the over-frequency averaging limit under the operating conditions of each power level of the wind farm, based on the positive value of the frequency regulation dead zone when the active power of the wind farm begins to decrease, the value of the frequency regulation end point when the active power of the wind farm no longer decreases, and the power reduction limit.

[0107] The overfrequency calculation submodule is used to calculate the slope of the active frequency droop curve and the output droop rate of the overfrequency based on the average value of the positive value of the frequency modulation dead zone, the average value of the frequency modulation end point value, and the average value of the output reduction limit of the overfrequency.

[0108] The underfrequency data acquisition module includes: an underfrequency response data submodule;

[0109] The underfrequency response data submodule is used to inject frequency signals with a constant slope decrease into the primary frequency regulation control device of the wind farm based on the operating conditions of each power level of the wind farm, so as to obtain the negative value of the frequency regulation dead zone when the active power of the wind farm starts to rise, the value of the frequency regulation end point when the active power of the wind farm no longer rises, and the output limit for each power level operating condition.

[0110] The underfrequency fitting module includes: an underfrequency averaging submodule and an underfrequency calculation submodule;

[0111] The under-frequency averaging submodule is used to calculate the average value of the under-frequency averaging dead zone, the average value of the under-frequency averaging end point, and the average value of the power output limit under the operating conditions of the wind farm at each power level, based on the negative value of the frequency regulation dead zone when the active power of the wind farm begins to rise, the value of the frequency regulation end point when the active power of the wind farm no longer rises, and the power output limit.

[0112] The underfrequency calculation submodule is used to calculate the slope of the active frequency droop curve and the boost droop rate of the underfrequency based on the average value of the negative value of the frequency modulation dead zone, the average value of the frequency modulation end point value, and the average value of the boost power limit.

[0113] The system also includes: a curve plotting module;

[0114] The curve plotting module is used to obtain the primary frequency regulation response curve of the wind farm with frequency on the horizontal axis and power on the vertical axis based on the fitted parameters.

[0115] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0116] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0117] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0118] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0119] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of the claims of the present invention pending approval.

Claims

1. A method for fitting primary frequency regulation parameters in a wind farm, characterized in that, include: Based on the operating conditions of different power levels, ramp overfrequency response tests were conducted to obtain overfrequency dynamic response data corresponding to each operating condition. The ramp overfrequency response data for each power level operating condition were fitted separately; Based on different power levels of operating conditions, ramp underfrequency response tests were conducted to obtain underfrequency dynamic response data corresponding to each operating condition. The ramp underfrequency response data for each power level operating condition were fitted separately; The operating conditions for each power level are divided according to the rated power. The process of fitting the ramp overfrequency response data for each power level operating condition includes: Under the operating conditions of each power level of the wind farm, based on the positive value of the frequency regulation dead zone when the active power of the wind farm begins to decrease, the value of the frequency regulation end point when the active power of the wind farm no longer decreases, and the power reduction limit, the average value of the positive value of the frequency regulation dead zone, the average value of the frequency regulation end point, and the average value of the power reduction limit for excessive frequency are obtained. Based on the average value of the positive value of the frequency dead zone of the overfrequency, the average value of the frequency end point of the overfrequency, and the average value of the output reduction limit of the overfrequency, the slope of the active frequency droop curve and the output reduction droop rate of the overfrequency are calculated. The process of fitting the ramp underfrequency response data for each power level operating condition includes: Under the operating conditions of each power level of the wind farm, based on the negative value of the frequency regulation dead zone when the active power of the wind farm begins to rise, the value of the frequency regulation end point when the active power of the wind farm no longer rises, and the power output limit, the average value of the negative value of the frequency regulation dead zone, the average value of the frequency regulation end point, and the average value of the power output limit for under-frequency conditions are obtained. Based on the average value of the negative value of the frequency dead zone of the under-frequency modulation, the average value of the frequency modulation end point of the under-frequency modulation, and the average value of the boost power limit, the slope of the active frequency droop curve and the boost power droop rate of the under-frequency modulation are calculated.

2. The method as described in claim 1, characterized in that, The above describes the slope overfrequency response test conducted under different power levels to obtain overfrequency dynamic response data for each operating condition, including: Based on the operating conditions of each power level of the wind farm, a frequency signal with a constant slope increase is injected into the primary frequency regulation control device of the wind farm to obtain the positive value of the frequency regulation dead zone when the active power of the wind farm begins to decrease under each power level operating condition, the frequency regulation end point value when the active power of the wind farm no longer decreases, and the output reduction limit.

3. The method as described in claim 1, characterized in that, The slope underfrequency response test was conducted based on operating conditions at different power levels to obtain underfrequency dynamic response data corresponding to each operating condition, including: Based on the operating conditions of each power level of the wind farm, a frequency signal with a constant slope decrease is injected into the primary frequency regulation control device of the wind farm to obtain the negative value of the frequency regulation dead zone when the active power of the wind farm begins to rise, the frequency regulation end point value when the active power of the wind farm no longer rises, and the output limit for each power level operating condition.

4. The method as described in claim 1, characterized in that, The formula for calculating the slope of the over-frequency active frequency droop curve is as follows: In the formula, D dn P represents the slope of the active-frequency droop curve for excessive frequency in a wind farm. dnlim f is the average value of the output reduction limit under various power level operating conditions. Hend f is the average value of the frequency regulation termination point value under the operating conditions of each power level. Hdb This represents the average positive value of the frequency dead zone under operating conditions at each power level.

5. The method as described in claim 1, characterized in that, The formula for calculating the output droop rate is as follows: In the formula, δ dn To reduce the output droop rate, f N For a rated frequency of 50Hz, P N D is the rated power of the wind farm. dn This represents the slope of the active-frequency droop curve for excessive wind farm frequency.

6. The method as described in claim 1, characterized in that, The formula for calculating the slope of the under-frequency active frequency droop curve is as follows: In the formula, D up P represents the slope of the active frequency droop curve for underfrequency applications. uplim f is the average value of the lift-off limit under operating conditions at each power level. Ldb f is the average of the negative values ​​of the underfrequency dead zone under various power level operating conditions. Lend This represents the average value of the frequency modulation termination point value under the operating conditions of each power level.

7. The method as described in claim 1, characterized in that, The formula for calculating the lift output droop rate is as follows: In the formula, δ up For the output droop rate, D up f is the slope of the active frequency droop curve for underfrequency applications. N For a rated frequency of 50Hz, P N This refers to the rated power of the wind farm.

8. The method as described in claim 1, characterized in that, Also includes: Based on the parameters obtained from the fitting, the primary frequency regulation response curve of the wind farm is obtained with frequency on the horizontal axis and power on the vertical axis.

9. The method as described in claim 1, characterized in that, The operating conditions for different power levels include: The power range of the first-class power operating condition is 70% of the rated power; The power range for the second-class power operating condition is 40% to 60% of the rated power; The power range for the third-level power condition is 20% to 30% of the rated power.

10. A wind farm primary frequency regulation parameter fitting system, characterized in that, include: The system includes an over-frequency data acquisition module, an over-frequency fitting module, an under-frequency data acquisition module, and an under-frequency fitting module. The overfrequency data acquisition module is used to conduct ramp overfrequency response tests based on operating conditions of different power levels, and obtain overfrequency dynamic response data corresponding to each operating condition. The overfrequency fitting module is used to fit the ramp overfrequency response data of each power level operating condition. The underfrequency data acquisition module is used to conduct ramp underfrequency response tests based on operating conditions at different power levels, and obtain underfrequency dynamic response data corresponding to each operating condition. The underfrequency fitting module is used to fit the ramp underfrequency response data of each power level operating condition. The operating conditions for each power level are divided according to the rated power. The overfrequency fitting module specifically includes: Under the operating conditions of each power level of the wind farm, based on the positive value of the frequency regulation dead zone when the active power of the wind farm begins to decrease, the value of the frequency regulation end point when the active power of the wind farm no longer decreases, and the power reduction limit, the average value of the positive value of the frequency regulation dead zone, the average value of the frequency regulation end point, and the average value of the power reduction limit for excessive frequency are obtained. Based on the average value of the positive value of the frequency dead zone of the overfrequency, the average value of the frequency end point of the overfrequency, and the average value of the output reduction limit of the overfrequency, the slope of the active frequency droop curve and the output reduction droop rate of the overfrequency are calculated. The underfrequency fitting module specifically includes: Under the operating conditions of each power level of the wind farm, based on the negative value of the frequency regulation dead zone when the active power of the wind farm begins to rise, the value of the frequency regulation end point when the active power of the wind farm no longer rises, and the power output limit, the average value of the negative value of the frequency regulation dead zone, the average value of the frequency regulation end point, and the average value of the power output limit for under-frequency conditions are obtained. Based on the average value of the negative value of the frequency dead zone of the under-frequency modulation, the average value of the frequency modulation end point of the under-frequency modulation, and the average value of the boost power limit, the slope of the active frequency droop curve and the boost power droop rate of the under-frequency modulation are calculated.

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