Regulation control method and system for rotating speed recovery speed of fan after inertial response

Abstract

The invention provides a method and system for adjusting and controlling the rotating speed recovery speed of a fan after inertial response, and the method comprises the steps: determining the rotating speed recovery coefficient of the fan through a controller according to the rotating speed of the fan and the frequency change rate of a power grid connected with the fan when the rotating speed of the fan is recovered; determining a power instruction value of the fan according to an inertia response mode coefficient of the fan and the rotating speed recovery coefficient; performing power following on the basis of the power instruction value until each rotating speed recovery data of the fan recovers to a value before inertia response, and quitting the rotating speed recovery function; wherein the inertia response mode coefficient is determined by the inertia response process of the fan; according to the method, the mode coefficient and the rotating speed recovery coefficient are introduced, so that the secondary falling of the power grid frequency caused by too high rotating speed recovery speed after the inertial response of the fan is limited, and the frequency stability of the power grid is improved.

Description

Technical Field

[0001] The patent application of the present invention belongs to the technical field of inertial response of fans, and specifically relates to a speed recovery speed adjustment control method and system for a fan after inertial response. Background Art

[0002] At present, with the rapid increase in wind power installed capacity, the large-scale access of wind power has greatly reduced the system inertia of the power grid, which has greatly affected the frequency stability of the power grid. To address the above problems, methods such as virtual inertia and virtual synchronous machines have been proposed to release the kinetic energy stored in wind turbines to provide short-term active support for the power grid. However, the kinetic energy stored in wind turbines is limited, and the wind turbines also have requirements for their minimum speed. Therefore, the speed of the wind turbine needs to be restored after the inertia response.

[0003] The traditional way to recover the speed of the fan after the inertial response is to directly switch the fan from the inertial response state to the maximum power point tracking (MPPT). However, this will cause the fan output power to drop sharply and the drop range is uncontrollable. For small systems that are sensitive to power changes, it may cause a secondary drop in frequency. This problem can be solved by de-loading the fan so that the fan runs on the right side of the wind energy utilization coefficient curve (Cp curve). When the inertial response ends, the fan speed can be restored by itself without reducing the output power. However, the above method has the following problems: 1. If the fan is small, such as Figure 1 As shown in the figure, if the inertial response provides too much energy, the fan operation point will exceed the corresponding point on its left side. If the fan is running at a low wind speed, it will not be able to recover to the speed before the response. Therefore, the speed change range is limited, that is, the inertial response ability is limited. 2. If the fan is running at a higher wind speed, that is, running at Figure 2 In the constant speed zone, the wind turbine usually runs on the left side of the wind energy utilization coefficient curve, and the wind turbine does not have the advantage of overspeed load reduction. When the speed is restored, the output power will still drop suddenly, which also makes the advantage of this method lost. Therefore, using the wind turbine overspeed load reduction operation to achieve the wind turbine speed recovery after inertial response without the reserved pitch angle reserve active power and external energy storage device will limit the wind turbine's inertial response ability, and it is not suitable for high wind speed conditions, and its practicality is poor. Summary of the invention

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the present invention patent application proposes a speed recovery speed adjustment control method for a fan after inertial response, comprising:

[0005] When the wind turbine recovers its speed, the controller determines the speed recovery coefficient of the wind turbine according to the speed of the wind turbine and the frequency change rate of the power grid to which the wind turbine is connected;

[0006] Determining a power command value of the fan according to the inertial response mode coefficient of the fan and the speed recovery coefficient;

[0007] Performing power following based on the power command value until each speed recovery data of the fan is restored to the value before inertial response, and then exiting the speed recovery function;

[0008] The inertial response mode coefficient is determined by the inertial response process of the wind turbine.

[0009] Preferably, determining the power command value of the fan according to the inertial response mode coefficient of the fan and the speed recovery coefficient includes:

[0010] According to the inertial response process of the fan in the inertial response stage, the inertial response mode coefficient is determined;

[0011] According to different inertial response processes, the power command value of the fan is calculated using the inertial response mode coefficient and the speed recovery coefficient.

[0012] Preferably, the inertial response process of the fan in the inertial response stage includes:

[0013] When all of the following conditions are met, the inertial response process of the wind turbine in the inertial response stage is the first response process: the frequency change rate of the power grid to which the wind turbine is connected is a negative number, the output active power of the wind turbine before the inertial response is less than the power of the wind turbine within a specified time after the start of the inertial response, and the output active power of the wind turbine before the inertial response is greater than the power of the wind turbine after the end of the inertial response;

[0014] When all of the following conditions are met, the inertial response process of the wind turbine in the inertial response stage is the second response process: the frequency change rate of the power grid to which the wind turbine is connected is a negative number, the output active power of the wind turbine before the inertial response is less than the power of the wind turbine within a specified time after the start of the inertial response, and the output active power of the wind turbine before the inertial response is less than the power of the wind turbine after the end of the inertial response;

[0015] When all of the following conditions are met, the inertial response process of the wind turbine in the inertial response stage is the third response process: the frequency change rate of the power grid to which the wind turbine is connected is negative, and the output active power of the wind turbine before the inertial response is greater than the power of the wind turbine within a specified time after the start of the inertial response.

[0016] Preferably, when the inertial response process of the fan in the inertial response stage is the first response process, the power command value of the fan is calculated using the following formula:

[0017]

[0018] Among them, P ref Indicates the power command value of the fan; P pre_fault Indicates the output active power of the fan before inertial response; K mode Represents the mode coefficient; K p_reco Indicates the speed recovery coefficient; P de-load It indicates the power reference value obtained by looking up the fan speed and overspeed reduction speed power data table; ΔP indicates the set fixed power value.

[0019] Preferably, when the inertial response process of the fan in the inertial response stage is the second response process, the power command value of the fan is calculated using the following formula:

[0020] P ref =P de-load

[0021] Among them, P ref Indicates the power command value of the fan; P de-load It indicates the power reference value obtained by looking up the fan speed and overspeed and load reduction speed power data table.

[0022] Preferably, when the inertial response process of the fan in the inertial response stage is the third response process, the power command value of the fan is calculated using the following formula:

[0023]

[0024] Among them, P ref Indicates the power command value of the fan; P pre_fault Indicates the output active power before inertial response; K mode Represents the mode coefficient; K reco Indicates the speed recovery coefficient; P de-load It indicates the power reference value obtained by looking up the fan speed and overspeed and load reduction speed power data table.

[0025] Preferably, determining the speed recovery coefficient of the wind turbine by a controller according to the speed of the wind turbine and the frequency change rate of the power grid to which the wind turbine is connected comprises:

[0026] According to the rotation speed of the fan, a rotation speed coefficient of the fan is calculated by a PI controller;

[0027] According to the frequency change rate of the power grid to which the wind turbine is connected, a frequency change rate coefficient of the power grid to which the wind turbine is connected is calculated by a P controller;

[0028] The frequency change rate coefficient and the speed coefficient are added together to obtain a speed recovery coefficient corresponding to the fan.

[0029] Preferably, the frequency change rate coefficient is calculated as follows:

[0030]

[0031] Among them, K RocoF Indicates the frequency change rate coefficient of the power grid to which the wind turbine is connected; K p represents the proportional coefficient of the P controller; Indicates the current frequency change rate of the wind turbine connected to the grid; Indicates the minimum acceptable frequency change rate reference value for wind turbines connected to the grid.

[0032] Preferably, the calculation formula of the speed coefficient is as follows:

[0033]

[0034] Among them, K omega Indicates the fan speed coefficient; K pomega Represents the proportional coefficient of the PI controller; K iomega Represents the differential coefficient of the PI controller; dω represents the difference between the speed before inertial response and the current speed; Indicates the differential of the speed difference.

[0035] Preferably, the power following is performed based on the power command value until each speed recovery data of the fan is restored to the value before the inertial response, and then the speed recovery function is exited, including:

[0036] Power following is performed based on the power command value until the speed recovery data of the fan meets all of the following conditions at the same time, and then the speed recovery function is exited: the difference between the output active power of the fan before the inertial response and the electromagnetic power of the fan is less than the power difference threshold, the difference between the speed of the fan before the inertial response and the current speed is less than the speed difference threshold, and the frequency change rate is less than the change rate threshold;

[0037] The rotation speed recovery data includes one or more of the following: electromagnetic power, rotation speed and frequency change rate.

[0038] Preferably, when the wind turbine recovers its speed, before determining the speed recovery coefficient of the wind turbine through the controller according to the speed of the wind turbine and the frequency change rate of the power grid to which the wind turbine is connected, the method further comprises:

[0039] Obtaining the rotation speed of the wind turbine and the frequency change rate of the power grid to which the wind turbine is connected;

[0040] Determining whether the inertial response of the wind turbine has ended according to the rotation speed of the wind turbine and the frequency change rate of the power grid to which the wind turbine is connected;

[0041] When the inertial response of the fan ends, a speed recovery function of the fan is activated.

[0042] Based on the same inventive concept, the patent application of the present invention also provides a speed recovery speed regulation control system for a fan after inertial response, comprising:

[0043] A coefficient determination module: used to determine the speed recovery coefficient of the fan through a controller according to the speed of the fan and the frequency change rate of the power grid to which the fan is connected when the fan recovers its speed;

[0044] Power calculation module: used to determine the power command value of the fan according to the inertial response mode coefficient of the fan and the speed recovery coefficient;

[0045] A power following module: used for performing power following based on the power command value until each speed recovery data of the fan is restored to the value before the inertial response, and then exiting the speed recovery function;

[0046] The inertial response mode coefficient is determined by the inertial response process of the wind turbine.

[0047] Preferably, the power calculation module is specifically used for:

[0048] According to the inertial response process of the fan in the inertial response stage, the inertial response mode coefficient is determined;

[0049] According to different inertial response processes, the power command value of the fan is calculated using the inertial response mode coefficient and the speed recovery coefficient.

[0050] Preferably, the inertial response process of the wind turbine in the power calculation module in the inertial response stage includes:

[0051] When all of the following conditions are met, the inertial response process of the wind turbine in the inertial response stage is the first response process: the frequency change rate of the power grid to which the wind turbine is connected is a negative number, the output active power of the wind turbine before the inertial response is less than the power of the wind turbine within a specified time after the start of the inertial response, and the output active power of the wind turbine before the inertial response is greater than the power of the wind turbine after the end of the inertial response;

[0052] When all of the following conditions are met, the inertial response process of the wind turbine in the inertial response stage is the second response process: the frequency change rate of the power grid to which the wind turbine is connected is a negative number, the output active power of the wind turbine before the inertial response is less than the power of the wind turbine within a specified time after the start of the inertial response, and the output active power of the wind turbine before the inertial response is less than the power of the wind turbine after the end of the inertial response;

[0053] When all of the following conditions are met, the inertial response process of the wind turbine in the inertial response stage is the third response process: the frequency change rate of the power grid to which the wind turbine is connected is negative, and the output active power of the wind turbine before the inertial response is greater than the power of the wind turbine within a specified time after the start of the inertial response.

[0054] Preferably, when the inertial response process of the fan in the inertial response stage in the power calculation module is the first response process, the power command value of the fan is calculated using the following formula:

[0055]

[0056] Among them, P ref Indicates the power command value of the fan; P pre_fault Indicates the output active power of the fan before inertial response; K mode Represents the mode coefficient; K p_reco Indicates the speed recovery coefficient; P de-load It indicates the power reference value obtained by looking up the fan speed and overspeed reduction speed power data table; ΔP indicates the set fixed power value.

[0057] Preferably, when the inertial response process of the fan in the inertial response stage in the power calculation module is the second response process, the power command value of the fan is calculated using the following formula:

[0058] P ref =P de-load

[0059] Among them, P ref Indicates the power command value of the fan; P de-load It indicates the power reference value obtained by looking up the fan speed and overspeed and load reduction speed power data table.

[0060] Preferably, when the inertial response process of the fan in the inertial response stage in the power calculation module is the third response process, the power command value of the fan is calculated using the following formula:

[0061]

[0062] Among them, P ref Indicates the power command value of the fan; P pre_fault Indicates the output active power before inertial response; K mode Represents the mode coefficient; K reco Indicates the speed recovery coefficient; P de-load It indicates the power reference value obtained by looking up the fan speed and overspeed and load reduction speed power data table.

[0063] Preferably, the coefficient determination module determines the speed recovery coefficient of the wind turbine through a controller according to the speed of the wind turbine and the frequency change rate of the power grid to which the wind turbine is connected, including:

[0064] According to the rotation speed of the fan, a rotation speed coefficient of the fan is calculated by a PI controller;

[0065] According to the frequency change rate of the power grid to which the wind turbine is connected, a frequency change rate coefficient of the power grid to which the wind turbine is connected is calculated by a P controller;

[0066] The frequency change rate coefficient and the speed coefficient are added together to obtain a speed recovery coefficient corresponding to the fan.

[0067] Preferably, the calculation formula of the frequency change rate coefficient in the coefficient determination module is as follows:

[0068]

[0069] Among them, K RoCoF Indicates the frequency change rate coefficient of the power grid to which the wind turbine is connected; K p represents the proportional coefficient of the P controller; Indicates the current frequency change rate of the power grid to which the wind turbine is connected; Indicates the minimum acceptable frequency change rate reference value for wind turbines connected to the grid.

[0070] Preferably, the calculation formula of the speed coefficient in the coefficient determination module is as follows:

[0071]

[0072] Among them, K omega Indicates the fan speed coefficient; K p_omega Represents the proportional coefficient of the PI controller; K i_omega Represents the differential coefficient of the PI controller; dω represents the difference between the speed before inertial response and the current speed; Indicates the differential of the speed difference.

[0073] Preferably, the power follower module is specifically used for:

[0074] Power following is performed based on the power command value until the speed recovery data of the fan meets all of the following conditions at the same time, and then the speed recovery function is exited: the difference between the output active power of the fan before the inertial response and the electromagnetic power of the fan is less than the power difference threshold, the difference between the speed of the fan before the inertial response and the current speed is less than the speed difference threshold, and the frequency change rate is less than the change rate threshold;

[0075] The rotation speed recovery data includes one or more of the following: electromagnetic power, rotation speed and frequency change rate.

[0076] Preferably, when the wind turbine recovers its speed, the coefficient determination module further includes:

[0077] Obtaining the rotation speed of the wind turbine and the frequency change rate of the power grid to which the wind turbine is connected;

[0078] Determining whether the inertial response of the wind turbine has ended according to the rotation speed of the wind turbine and the frequency change rate of the power grid to which the wind turbine is connected;

[0079] When the inertial response of the fan ends, a speed recovery function of the fan is activated.

[0080] Based on the same inventive concept, the present patent application also provides a computer device, including: one or more processors;

[0081] A memory for storing one or more programs;

[0082] When the one or more programs are executed by the one or more processors, the speed recovery speed adjustment control method of the fan after inertial response as described above is implemented.

[0083] Based on the same inventive concept, the patent application of the present invention also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed, a speed recovery speed adjustment control method for a fan after inertial response as described above is implemented.

[0084] Compared with the closest prior art, the patent application of this invention has the following beneficial effects:

[0085] The patent application of the present invention provides a method and system for regulating and controlling the speed recovery of a fan after inertial response, comprising: when the fan recovers its speed, the speed recovery coefficient of the fan is determined by a controller according to the speed of the fan and the frequency change rate of the power grid to which the fan is connected; the power command value of the fan is determined according to the inertial response mode coefficient of the fan and the speed recovery coefficient; power following is performed based on the power command value until each speed recovery data of the fan is restored to the value before the inertial response, and the speed recovery function is exited; wherein the inertial response mode coefficient is determined by the inertial response process in which the fan is located; the patent application of the present invention adaptively adjusts the speed recovery speed of the fan by introducing the mode coefficient and the speed recovery coefficient, which is beneficial to limiting the secondary drop in the power grid frequency caused by the excessively fast speed recovery speed of the fan after the inertial response, thereby improving the frequency stability of the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0086] Figure 1It is a schematic diagram of the operation of the wind turbine operating point on the wind energy utilization coefficient curve during inertial response of the wind turbine used in the prior art;

[0087] Figure 2 It is a curve diagram of a fan used in the prior art under overspeed and load reduction operation;

[0088] Figure 3 A schematic flow chart of a speed recovery speed regulation control method for a fan after inertial response provided in the patent application of the present invention;

[0089] Figure 4 A schematic diagram of the logic of generating the speed recovery coefficient in a speed adjustment control method for a fan after an inertial response provided in the patent application of the present invention;

[0090] Figure 5 A schematic diagram of the overall framework of a speed recovery speed regulation control method for a fan after inertial response provided in the patent application of the present invention;

[0091] Figure 6 A schematic diagram of a control structure for an application of a speed adjustment control method for a fan after an inertial response provided in the patent application of the present invention;

[0092] Figure 7 A schematic diagram comparing the inertial response of a fan with or without frequency control in a speed adjustment control method for recovering the speed of the fan after inertial response provided in the patent application of the present invention;

[0093] Figure 8 A schematic diagram comparing the inertial response of a fan with or without active power control in a speed recovery speed regulation control method for a fan after inertial response provided in the patent application of the present invention;

[0094] Fig. 9 A schematic diagram comparing the inertial response of a fan with or without speed control in a speed adjustment control method for recovering the speed of the fan after inertial response provided in the patent application of the present invention;

[0095] Fig.10 A schematic diagram of the change of the speed recovery coefficient of the fan before and after the inertial response in the specific embodiment provided in the patent application of the present invention;

[0096] Fig.11 A schematic diagram of the change in the speed recovery power value of the fan before and after the inertial response in the specific embodiment provided in the patent application of the present invention;

[0097] Fig.12 A schematic diagram of the structural composition of a speed recovery speed regulation control system for a fan after inertial response provided in the patent application of the present invention. DETAILED DESCRIPTION

[0098] The specific implementation methods of the patent application of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0099] Embodiment 1:

[0100] The patent application of this invention provides a speed recovery speed adjustment control method for a fan after inertial response, and the flow chart is as follows: Figure 3 As shown, including:

[0101] Step 1: When the wind turbine recovers its speed, a speed recovery coefficient of the wind turbine is determined by a controller according to the speed of the wind turbine and the frequency change rate of the power grid to which the wind turbine is connected;

[0102] Step 2: Determine the power command value of the fan according to the inertial response mode coefficient of the fan and the speed recovery coefficient;

[0103] Step 3: Perform power following based on the power command value until each speed recovery data of the fan is restored to the value before the inertial response, and then exit the speed recovery function;

[0104] The inertial response mode coefficient is determined by the inertial response process of the wind turbine.

[0105] Specifically, in step 1, according to the rotation speed of the wind turbine and the frequency change rate and rotation speed of the power grid to which the wind turbine is connected, the rotation speed recovery coefficient of the wind turbine is determined by the controller, including:

[0106] According to the rotation speed of the fan, a rotation speed coefficient of the fan is calculated by a PI controller;

[0107] According to the frequency change rate of the power grid to which the wind turbine is connected, a frequency change rate coefficient of the power grid to which the wind turbine is connected is calculated by a P controller;

[0108] The frequency change rate coefficient and the speed coefficient are added together to obtain a speed recovery coefficient corresponding to the fan.

[0109] When determining the fan speed recovery coefficient, Figure 4 As shown, the speed recovery coefficient K is determined by the corresponding controller according to the frequency change rate and the speed size. reco , speed recovery coefficient K reco At the same time, the frequency change rate coefficient K RocoF and speed factor K omeqa The frequency change rate coefficient K RocoF It is related to the frequency change rate of the power grid to which the wind turbine is connected. The frequency change rate is measured in real time when the wind turbine is connected to the power grid. Determine whether the fan has experienced a secondary drop or a secondary rise, and the reference value of the frequency change rate of the power grid to which the fan is connected According to different grid settings, the lowest acceptable value can be set to determine the frequency change rate coefficient K RoCoF ; Speed ​​coefficient K omega Related to the speed of the fan, the speed ω measured by the fan in real time meas and the fan speed before inertial response ω pre-fault , and then the speed coefficient K can be determined omega The size of the fan speed coefficient K omega When the fan speed is positive, the fan output active power needs to be reduced to restore the fan speed. When the fan has an unacceptable frequency drop, the frequency change rate coefficient K RoCoF and speed factor K omega The speed recovery slows down, and the secondary drop of frequency is suppressed. When calculating the frequency change rate coefficient K RocoF The proportional coefficient needs to be adjusted according to the system's acceptance of the secondary frequency drop. It is preferably a larger value to ensure that when the secondary frequency drop occurs, the fan speed recovery speed can be quickly limited to quickly suppress the secondary frequency drop. reco Only after the inertial response of the fan ends, and the frequency change df and frequency change rate of the fan The product is positive, that is, When the starting frequency change rate coefficient K RoCoF If the calculation does not meet this requirement, then K RoCoF Set to 0, speed recovery coefficient K reco Equal to the speed coefficient K omega .

[0110] Specifically, the frequency change rate coefficient K of the power grid to which the wind turbine is connected RoCoF The corresponding calculation formula is as follows:

[0111]

[0112] Among them, K p represents the proportional coefficient of the P controller; Indicates the current frequency change rate of the wind turbine connected to the grid; It indicates the minimum acceptable frequency change rate reference value for wind turbines connected to the grid.

[0113] The speed coefficient K omega The calculation formula is as follows:

[0114]

[0115] Among them, K p_omega Represents the proportional coefficient of the PI controller; K i_omegaRepresents the differential coefficient of the PI controller; dω represents the difference between the speed before inertial response and the current speed; Indicates the differential of the speed difference.

[0116] Before step 1 also include:

[0117] Obtaining the rotation speed of the wind turbine and the frequency change rate of the power grid to which the wind turbine is connected;

[0118] Determining whether the inertial response of the wind turbine has ended according to the rotation speed of the wind turbine and the frequency change rate of the power grid to which the wind turbine is connected;

[0119] When the inertial response of the fan ends, activating a speed recovery function of the fan;

[0120] The patent application of the present invention uses a phase-locked loop (PLL) to measure the real-time frequency of the common coupling point in the wind turbine and the frequency change rate of the wind turbine connected to the power grid, and processes the frequency and the frequency change rate through a first-order filter to obtain the corresponding frequency signal f and frequency change rate signal If f exceeds the dead zone and the product of the frequency change and the frequency change rate is a positive number, it means that f exceeds the dead zone and When the inertial response function of the fan is activated, the output active power P of the fan at the moment before the inertial response is memorized. pre-fault And the speed ω pre-fault When the inertial response of the fan ends, the fan enters the speed recovery stage. When judging whether the inertial response of the fan ends, the fan state after the inertial response is activated is obtained, and the real-time speed of the fan is measured by using a positionless sensor. turb , determine the frequency change rate Less than the set change rate threshold threshold or the fan speed ω turb Less than the set speed threshold ω min , that is, satisfy or turb <ω min One of the above can determine that the inertial response is over, and when the inertial response of the fan is over, the speed recovery function of the fan is activated.

[0121] Step 2 includes:

[0122] According to the inertial response process of the fan in the inertial response stage, the inertial response mode coefficient is determined;

[0123] According to different inertial response processes, the power command value of the fan is calculated using the inertial response mode coefficient and the speed recovery coefficient.

[0124] When the inertia response function of the fan is activated and the inertia response process has not yet ended, it is necessary to determine the inertia response process of the fan in the inertia response stage. The inertia response process of the fan is different, and its speed recovery strategy after inertia response is also different. The inertia response process of the fan in the inertia response stage includes:

[0125] When all of the following conditions are met, the inertial response process of the wind turbine in the inertial response stage is the first response process: the frequency change rate of the power grid to which the wind turbine is connected is a negative number, that is, The output active power P of the fan before inertial response pre-fault Less than the power P of the fan within a specified time t after the inertial response begins wind , that is, within a period of time t (P pre-fault -P wind )<0, and the output active power P of the fan before inertial response pre-fault Greater than the fan power P after the inertial response ends wind , that is, satisfying P wind <P pre-fault When the above conditions are met, the fan runs at Figure 2 The wind turbine operating point moves beyond the corresponding point on its left side after the inertial response;

[0126] When all of the following conditions are met, the inertial response process of the wind turbine in the inertial response stage is the second response process: the frequency change rate of the power grid to which the wind turbine is connected is negative, that is, The output active power P of the fan before inertial response pre-fault Less than the power P of the fan within a specified time t after the inertial response begins wind , that is, satisfying (P pre-fault -P wind )<0 and the output active power P of the fan before inertial response pre-fault Less than the fan power P after the inertial response ends wind , that is, satisfying P wind >P pre-fault When the above conditions are met, the fan runs at Figure 2 The low wind speed area in the wind turbine, and the wind turbine operating point does not move beyond the corresponding point on its left after the inertial response;

[0127] When all of the following conditions are met, the inertial response process of the wind turbine in the inertial response stage is the third response process: the frequency change rate of the power grid to which the wind turbine is connected is a negative number, that is, The output active power P of the fan before inertial response pre-fault Greater than the fan power P within a specified time after the inertial response begins wind , that is, satisfying (Ppre-fault- P wind )>0, when the above conditions are met, the fan runs at Figure 2 High wind speed areas in

[0128] Among them, the power of the fan P wind The calculation formula is as follows:

[0129]

[0130] Where ρ is the air density; R is the radius of the wind turbine; v is the wind speed; C p (λ, β) represents the wind energy utilization coefficient corresponding to the tip speed ratio λ and the pitch angle β of the wind turbine.

[0131] When the inertial response process of the fan in the inertial response stage is the first response process, the mode coefficient of the fan is determined as K mode = 1, until the fan power P is achieved for the first time wind >P pre-fault +ΔP, K mode Set to zero; where P pre_fault It indicates the output active power of the fan before the inertial response, and ΔP indicates the set fixed power value;

[0132] When the inertial response process of the fan in the inertial response stage is the second response process, K mode =0, the fan speed recovers automatically without negatively affecting the system frequency.

[0133] When the inertial response process of the fan in the inertial response stage is the third response process, K mode =1, the fan output power decreases and the speed recovers.

[0134] When the inertial response process of the fan in the inertial response stage is the first response process, the power command value of the fan is calculated using the following formula:

[0135]

[0136] Among them, P ref Indicates the power command value of the fan; P pre_fault Indicates the output active power of the fan before inertial response; K mode Represents the mode coefficient; K p_reco Indicates the speed recovery coefficient; P de-load It indicates the power reference value obtained by looking up the fan speed and overspeed reduction speed power data table; ΔP indicates the set fixed power value.

[0137] When the inertial response process of the fan in the inertial response stage is the second response process, the power command value of the fan is calculated using the following formula:

[0138] P ref =P de-load

[0139] Among them, P ref Indicates the power command value of the fan; P de-load It indicates the power reference value obtained by looking up the fan speed and overspeed and load reduction speed power data table.

[0140] When the inertial response process of the fan in the inertial response stage is the third response process, the power command value of the fan is calculated using the following formula:

[0141]

[0142] Among them, P ref Indicates the power command value of the fan; P pre_fault Indicates the output active power before inertial response; K mode Represents the mode coefficient; K reco Indicates the speed recovery coefficient; P de-load It indicates the power reference value obtained by looking up the table of fan speed and overspeed load reduction speed power data;

[0143] When it is determined that the fan needs to end the inertial response, the speed is restored. If the fan power P wind When it is impossible to measure, the power command value of the fan is calculated using the following formula:

[0144] P ref =P de-load -ΔP reco

[0145] In the formula,

[0146] ΔP reco =K p_reco ·(P pre-fault -P de-load )

[0147] Among them, P ref Indicates the power command value of the fan; P de-load It indicates the power reference value obtained by looking up the table of fan speed and overspeed load reduction speed power data; ΔP reco Indicates the power value of the fan used for speed recovery; P pre_fault Indicates the output active power of the fan before inertial response; K p _ reco Indicates the speed recovery coefficient.

[0148] Step 3 includes:

[0149] The power following is performed based on the power command value until the speed recovery data of the fan meets all the following conditions at the same time, and then the speed recovery function is exited: the output active power P of the fan before the inertial response pre-fault and the electromagnetic power P of the fan meas The difference is less than the power difference threshold, that is, (P pre-fault -P meas )<Th1, the speed of the fan before inertial response ω pre-fault and the current speed ω meas The difference is less than the speed difference threshold, that is, (ω pre-fault -ω meas )<Th2, the frequency change rate Less than the change rate threshold, that is, satisfied

[0150] The rotation speed recovery data includes one or more of the following: electromagnetic power, rotation speed and frequency change rate.

[0151] The patent application of the present invention provides a speed recovery speed adjustment control method for a fan after inertial response. When the inertial response process of the fan in the inertial response stage is the first response process, the speed recovery function of the fan is activated after the inertial response ends. If the product of the frequency change amount and the frequency change rate is a positive number, that is, The fan speed recovery coefficient changes with the frequency The speed difference is adaptively adjusted to suppress the secondary drop of the grid frequency. If the product of the frequency change and the frequency change rate is a non-positive number, it satisfies Then the frequency change rate coefficient K RoCoF Set to 0, the fan speed recovery coefficient is only related to the speed difference, and the corresponding power command value P is output. ref When the fan passes the speed and overspeed reduction speed power data table to obtain the power reference value P de-load Output active power P before exceeding the inertial response of the fan pre-fault A fixed power value ΔP, which is the power value used for speed recovery reco After returning to zero, the fan speed will automatically continue to recover without causing a reduction in power and a secondary drop in frequency.

[0152] When the inertial response process of the fan in the inertial response stage is the second response process, the speed recovery function of the fan is activated after the inertial response ends. During the speed recovery process, the power value ΔP used for speed recovery is reco Always set to zero, the fan speed automatically recovers and will not cause a drop in its output power to cause a secondary drop in the grid frequency.

[0153] When the inertial response process of the fan in the inertial response stage is the third response process, the speed recovery function of the fan is activated after the inertial response ends. When the speed is recovered, the power command value P of the fan is calculated. ref If the product of the frequency change and the frequency change rate is a positive number, then The fan speed recovery coefficient changes with the frequency Adaptively adjust its size to suppress the secondary drop of the power grid frequency. If the product of the frequency change amount and the frequency change rate is a non-positive number, that is The fan speed recovery coefficient is maintained at the default value until the speed recovery data of the fan is restored to the value before the inertial response, and the speed recovery function is exited. It can be seen that the speed recovery speed adjustment control method of the fan after inertial response in the patent application of the present invention is suitable for the speed recovery speed adaptive adjustment control strategy of the fan running in overspeed and load reduction after inertial response without reserved pitch angle reserve active power and external energy storage device, such as Figure 5 As shown in the figure, after the inertial response ends, the wind turbine recovers its speed, and a mode coefficient and a speed recovery coefficient are introduced. The introduction of the mode coefficient enables the wind turbine running under overspeed load reduction and without reserved pitch angle reserve active power and external energy storage device to realize the speed recovery function under any working conditions; the introduction of the speed recovery coefficient is used to control the speed recovery speed of the wind turbine, which can dynamically control the speed recovery according to the rate of change of frequency after the inertial response function of the wind turbine is exited, and the power following of the wind turbine is realized according to the introduced mode coefficient and speed recovery coefficient, which can effectively suppress the secondary drop of the system power grid after the inertial response, and improve the frequency stability of the power grid.

[0154] Embodiment 2:

[0155] A specific embodiment is used to illustrate the feasibility of a speed recovery speed adjustment control method for a wind turbine after inertial response provided by the patent application of the present invention. Under the premise of the provided no reserved pitch angle reserve active power and external energy storage device, the speed recovery speed adaptive adjustment control strategy of the wind turbine after inertial response of overspeed load reduction operation is adopted. The method is implemented in the power system simulation software DigSILENT and is used as follows Figure 6 The schematic diagram shown in the figure is used for construction. The test is carried out under high wind speed (12m / s) and the AC system is a weak grid condition with an inertia time constant of 4s. Under this condition, a 20MW load is connected at 20s. Figure 6 The position shown causes the frequency to drop and the fan inertia response starts. The effect is as follows Figure 7-Figure 9As shown in the figure, under this working condition, the frequency of the common coupling point PCC is 49.81Hz when stable. At 20s, the load of 20MW is connected to the system, and the inertial response function of the wind turbine is started. Its output power rises rapidly to 1pu to limit the frequency change rate. At 22.5s, the frequency change rate approaches 0, and it is determined that the wind turbine starts to recover its speed. For traditional wind turbine control, after the inertial response, the power command value is directly switched from the power corresponding to the inertial response to the power corresponding to the speed. Therefore, its output power has a sudden change. Figure 7-Figure 9 It can be seen that due to the sudden change of active power, the frequency of the common coupling point PCC drops twice, from 48.81 Hz to 48.7 Hz. Under the same working conditions, the speed recovery coefficient and the speed recovery additional power of the wind turbine using the method provided in the present invention are as follows: Figure 10-11 As shown in the figure, during the speed recovery process, the lowest frequency only dropped from 48.81 Hz to 48.8 Hz.

[0156] According to the above simulation results, it can be seen that the patent application of the present invention can adaptively adjust the speed recovery coefficient to limit the secondary drop in system frequency caused by speed recovery after the inertial response of the wind turbine without reserving pitch angle reserve active power and external energy storage device, thereby improving the frequency stability of the system. In addition, the adaptively adjusted speed recovery coefficient significantly improves the applicability of the control method in power grids under different working conditions.

[0157] Embodiment 3:

[0158] Based on the same inventive concept, the patent application of the present invention also provides a speed recovery speed regulation control system for the fan after inertial response, the structural composition diagram is as follows Fig.12 As shown, including:

[0159] A coefficient determination module: used to determine the speed recovery coefficient of the fan through a controller according to the speed of the fan and the frequency change rate of the power grid to which the fan is connected when the fan recovers its speed;

[0160] Power calculation module: used to determine the power command value of the fan according to the inertial response mode coefficient of the fan and the speed recovery coefficient;

[0161] A power following module: used for performing power following based on the power command value until each speed recovery data of the fan is restored to the value before the inertial response, and then exiting the speed recovery function;

[0162] The inertial response mode coefficient is determined by the inertial response process of the wind turbine.

[0163] When the wind turbine recovers its speed in the coefficient determination module, before determining the speed recovery coefficient of the wind turbine through the controller according to the speed of the wind turbine and the frequency change rate of the power grid to which the wind turbine is connected, the method further includes:

[0164] Obtaining the rotation speed of the wind turbine and the frequency change rate of the power grid to which the wind turbine is connected;

[0165] Determining whether the inertial response of the wind turbine has ended according to the rotation speed of the wind turbine and the frequency change rate of the power grid to which the wind turbine is connected;

[0166] When the inertial response of the fan ends, a speed recovery function of the fan is activated.

[0167] The coefficient determination module determines the speed recovery coefficient of the wind turbine through a controller according to the speed of the wind turbine and the frequency change rate of the power grid to which the wind turbine is connected, including:

[0168] According to the rotation speed of the fan, a rotation speed coefficient of the fan is calculated by a PI controller;

[0169] According to the frequency change rate of the power grid to which the wind turbine is connected, a frequency change rate coefficient of the power grid to which the wind turbine is connected is calculated by a P controller;

[0170] The frequency change rate coefficient and the speed coefficient are added together to obtain a speed recovery coefficient corresponding to the fan.

[0171] The calculation formula of the frequency change rate coefficient in the coefficient determination module is as follows:

[0172]

[0173] Among them, K RoCoF Indicates the frequency change rate coefficient of the power grid to which the wind turbine is connected; K p represents the proportional coefficient of the P controller; Indicates the current frequency change rate of the wind turbine connected to the grid; It indicates the reference value of the minimum frequency change rate that the wind turbine can accept when connected to the power grid.

[0174] The calculation formula of the speed coefficient in the coefficient determination module is as follows:

[0175]

[0176] Among them, K omega Indicates the fan speed coefficient; K p_omega Represents the proportional coefficient of the PI controller; K i_omega Represents the differential coefficient of the PI controller; dω represents the difference between the speed before inertial response and the current speed; Indicates the differential of the speed difference.

[0177] The power calculation module is specifically used for:

[0178] According to the inertial response process of the fan in the inertial response stage, the inertial response mode coefficient is determined;

[0179] According to different inertial response processes, the power command value of the fan is calculated using the inertial response mode coefficient and the speed recovery coefficient.

[0180] The inertial response process of the fan in the power calculation module in the inertial response stage includes:

[0181] When all of the following conditions are met, the inertial response process of the wind turbine in the inertial response stage is the first response process: the frequency change rate of the power grid to which the wind turbine is connected is a negative number, the output active power of the wind turbine before the inertial response is less than the power of the wind turbine within a specified time after the start of the inertial response, and the output active power of the wind turbine before the inertial response is greater than the power of the wind turbine after the end of the inertial response;

[0182] When all of the following conditions are met, the inertial response process of the wind turbine in the inertial response stage is the second response process: the frequency change rate of the power grid to which the wind turbine is connected is a negative number, the output active power of the wind turbine before the inertial response is less than the power of the wind turbine within a specified time after the start of the inertial response, and the output active power of the wind turbine before the inertial response is less than the power of the wind turbine after the end of the inertial response;

[0183] When all of the following conditions are met, the inertial response process of the wind turbine in the inertial response stage is the third response process: the frequency change rate of the power grid to which the wind turbine is connected is negative, and the output active power of the wind turbine before the inertial response is greater than the power of the wind turbine within a specified time after the start of the inertial response.

[0184] When the inertial response process of the fan in the inertial response stage in the power calculation module is the first response process, the power command value of the fan is calculated using the following formula:

[0185]

[0186] Among them, P ref Indicates the power command value of the fan; P pre_fault Indicates the output active power of the fan before inertial response; K mode Represents the mode coefficient; K p_reco Indicates the speed recovery coefficient; P de-load It indicates the power reference value obtained by looking up the fan speed and overspeed reduction speed power data table; ΔP indicates the set fixed power value.

[0187] When the inertial response process of the fan in the inertial response stage in the power calculation module is the second response process, the power command value of the fan is calculated using the following formula:

[0188] P ref =P de-load

[0189] Among them, P ref Indicates the power command value of the fan; P de-load It indicates the power reference value obtained by looking up the fan speed and overspeed and load reduction speed power data table.

[0190] When the inertial response process of the fan in the inertial response stage in the power calculation module is the third response process, the power command value of the fan is calculated using the following formula:

[0191]

[0192] Among them, P ref Indicates the power command value of the fan; P pre_fault Indicates the output active power before inertial response; K mode Represents the mode coefficient; K reco Indicates the speed recovery coefficient; P de-load It indicates the power reference value obtained by looking up the fan speed and overspeed and load reduction speed power data table.

[0193] The power follower module is specifically used for:

[0194] Power following is performed based on the power command value until the speed recovery data of the fan meets all of the following conditions at the same time, and then the speed recovery function is exited: the difference between the output active power of the fan before the inertial response and the electromagnetic power of the fan is less than the power difference threshold, the difference between the speed of the fan before the inertial response and the current speed is less than the speed difference threshold, and the frequency change rate is less than the change rate threshold;

[0195] The rotation speed recovery data includes one or more of the following: electromagnetic power, rotation speed and frequency change rate.

[0196] Embodiment 4:

[0197] Based on the same inventive concept, the patent application of the present invention also provides a computer device, which includes a processor and a memory, wherein the memory is used to store a computer program, wherein the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of the speed recovery speed adjustment control method of the fan after inertial response in the above embodiment.

[0198] Embodiment 5:

[0199] Based on the same inventive concept, the patent application of the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It can be understood that the computer-readable storage medium here can include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of a speed adjustment control method for the speed recovery of the fan after inertial response in the above embodiment.

[0200] It should be understood by those skilled in the art that the embodiments of the present invention patent application can be provided as methods, systems, or computer program products. Therefore, the present invention patent application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention patent application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0201] The present invention patent application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present invention patent application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0202] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0203] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0204] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the patent application of the present invention rather than to limit its protection scope. Although the patent application of the present invention is described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that after reading the patent application of the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the application, but these changes, modifications or equivalent substitutions are all within the protection scope of the claims to be approved.

Claims

1. A method for adjusting and controlling the speed of a fan after inertial response, characterized in that: include: When the wind turbine recovers its speed, the controller determines the speed recovery coefficient of the wind turbine according to the speed of the wind turbine and the frequency change rate of the power grid to which the wind turbine is connected; Determining a power command value of the fan according to the inertial response mode coefficient of the fan and the speed recovery coefficient; Performing power following based on the power command value until each speed recovery data of the fan is restored to the value before the inertial response, and then exiting the speed recovery function; The inertial response mode coefficient is determined by the inertial response process of the wind turbine.

2. The method according to claim 1, characterized in that Determining the power command value of the fan according to the inertial response mode coefficient and the speed recovery coefficient of the fan includes: According to the inertial response process of the fan in the inertial response stage, the inertial response mode coefficient is determined; According to different inertial response processes, the power command value of the fan is calculated using the inertial response mode coefficient and the speed recovery coefficient.

3. The method according to claim 2, characterized in that The inertial response process of the fan in the inertial response stage includes: When all of the following conditions are met, the inertial response process of the wind turbine in the inertial response stage is the first response process: the frequency change rate of the power grid to which the wind turbine is connected is a negative number, the output active power of the wind turbine before the inertial response is less than the power of the wind turbine within a specified time after the start of the inertial response, and the output active power of the wind turbine before the inertial response is greater than the power of the wind turbine after the end of the inertial response; When all of the following conditions are met, the inertial response process of the wind turbine in the inertial response stage is the second response process: the frequency change rate of the power grid to which the wind turbine is connected is a negative number, the output active power of the wind turbine before the inertial response is less than the power of the wind turbine within a specified time after the start of the inertial response, and the output active power of the wind turbine before the inertial response is less than the power of the wind turbine after the end of the inertial response; When all of the following conditions are met, the inertial response process of the wind turbine in the inertial response stage is the third response process: the frequency change rate of the power grid to which the wind turbine is connected is negative, and the output active power of the wind turbine before the inertial response is greater than the power of the wind turbine within a specified time after the start of the inertial response.

4. The method according to claim 3, characterized in that When the inertial response process of the fan in the inertial response stage is the first response process, the power command value of the fan is calculated using the following formula: P ref =P pre_fault -K mode ·K p_reco ·(P pre_fault -P de-load )-ΔP Among them, P ref Indicates the power command value of the fan; P pre_fault Indicates the output active power of the fan before inertial response; K mode Represents the mode coefficient; K p_reco Indicates the speed recovery coefficient; P de-load It indicates the power reference value obtained by looking up the fan speed and overspeed reduction speed power data table; ΔP indicates the set fixed power value.

5. The method according to claim 3, characterized in that When the inertial response process of the fan in the inertial response stage is the second response process, the power command value of the fan is calculated using the following formula: P ref =P de-load Among them, P ref Indicates the power command value of the fan; P de-load It indicates the power reference value obtained by looking up the fan speed and overspeed and load reduction speed power data table.

6. The method according to claim 3, characterized in that When the inertial response process of the fan in the inertial response stage is the third response process, the power command value of the fan is calculated using the following formula: P ref =P pre_fault -K mode ·K reco ·(P pre_fault -P de-load ) Among them, P ref Indicates the power command value of the fan; P pre_fault Indicates the output active power before inertial response; K mode Represents the mode coefficient; K reco Indicates the speed recovery coefficient; P de-load It indicates the power reference value obtained by looking up the fan speed and overspeed and load reduction speed power data table.

7. The method according to claim 1, characterized in that Determining the speed recovery coefficient of the wind turbine by a controller according to the speed of the wind turbine and the frequency change rate of the power grid to which the wind turbine is connected includes: According to the rotation speed of the fan, a rotation speed coefficient of the fan is calculated by a PI controller; According to the frequency change rate of the power grid to which the wind turbine is connected, a frequency change rate coefficient of the wind turbine is calculated by a P controller; The frequency change rate coefficient and the speed coefficient are added together to obtain a speed recovery coefficient corresponding to the fan.

8. The method according to claim 7, characterized in that The frequency change rate coefficient is calculated as follows: Among them, K RoCoF Indicates the frequency change rate coefficient of the power grid to which the wind turbine is connected; K p represents the proportional coefficient of the P controller; Indicates the current frequency change rate of the wind turbine connected to the grid; Indicates the minimum acceptable frequency change rate reference value for wind turbines connected to the grid.

9. The method according to claim 7, characterized in that The calculation formula of the speed coefficient is as follows: Among them, K omega Indicates the fan speed coefficient; K p_omega Represents the proportional coefficient of the PI controller; K i_omega Represents the differential coefficient of the PI controller; dω represents the difference between the speed before inertial response and the current speed; Indicates the differential of the speed difference.

10. The method according to claim 1, characterized in that The power following is performed based on the power command value until each speed recovery data of the fan is restored to the value before the inertial response, and then the speed recovery function is exited, including: Power following is performed based on the power command value until the speed recovery data of the fan meets all of the following conditions at the same time, and then the speed recovery function is exited: the difference between the output active power of the fan before the inertial response and the electromagnetic power of the fan is less than the power difference threshold, the difference between the speed of the fan before the inertial response and the current speed is less than the speed difference threshold, and the frequency change rate is less than the change rate threshold; The rotation speed recovery data includes one or more of the following: electromagnetic power, rotation speed and frequency change rate.

11. The method according to claim 1, characterized in that When the wind turbine recovers its speed, before determining the speed recovery coefficient of the wind turbine through the controller according to the speed of the wind turbine and the frequency change rate of the power grid to which the wind turbine is connected, the method further includes: Obtaining the rotation speed of the wind turbine and the frequency change rate of the power grid to which the wind turbine is connected; Determining whether the inertial response of the wind turbine has ended according to the rotation speed of the wind turbine and the frequency change rate of the power grid to which the wind turbine is connected; When the inertial response of the fan ends, a speed recovery function of the fan is activated.

12. A speed recovery control system for a fan after inertial response, characterized in that: include: A coefficient determination module: used to determine the speed recovery coefficient of the fan through a controller according to the speed of the fan and the frequency change rate of the power grid to which the fan is connected when the fan recovers its speed; Power calculation module: used to determine the power command value of the fan according to the inertial response mode coefficient of the fan and the speed recovery coefficient; A power following module: used for performing power following based on the power command value until each speed recovery data of the fan is restored to the value before the inertial response, and then exiting the speed recovery function; The inertial response mode coefficient is determined by the inertial response process of the wind turbine.

13. The system of claim 12, wherein: The coefficient determination module determines the speed recovery coefficient of the wind turbine through a controller according to the speed of the wind turbine and the frequency change rate of the power grid to which the wind turbine is connected, including: According to the rotation speed of the fan, a rotation speed coefficient of the fan is calculated by a PI controller; According to the frequency change rate of the power grid to which the wind turbine is connected, a frequency change rate coefficient of the power grid to which the wind turbine is connected is calculated by a P controller; The frequency change rate coefficient and the speed coefficient are added together to obtain a speed recovery coefficient corresponding to the fan.

14. The system of claim 12, wherein: The power calculation module is specifically used for: According to the inertial response process of the fan in the inertial response stage, the inertial response mode coefficient is determined; According to different inertial response processes, the power command value of the fan is calculated using the inertial response mode coefficient and the speed recovery coefficient.

15. A computer device, characterized in that: include: one or more processors; A memory for storing one or more programs; When the one or more programs are executed by the one or more processors, a speed recovery speed adjustment control method for a fan after inertial response as claimed in any one of claims 1 to 11 is implemented.

16. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, a speed recovery speed adjustment control method for a fan after inertial response as described in any one of claims 1 to 11 is implemented.

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