Method and device for primary frequency regulation control of a wind turbine generator system

Abstract

This disclosure proposes a method and apparatus for primary frequency regulation control of a wind turbine generator set. The method includes detecting the grid frequency and calculating the grid frequency change rate and the amount of grid frequency change. If the grid frequency change rate and the amount of grid frequency change meet requirements, the frequency regulation dead zone and the frequency-active power change rate are corrected based on the grid frequency and the grid frequency change rate to obtain a target frequency-active power piecewise linear function. A target active power is obtained based on the grid frequency and the target frequency-active power piecewise linear function, and primary frequency regulation of the wind turbine generator set is performed based on the target active power. The method of this disclosure can overcome the problem that fixed dead zones and active power change rates cause significant adverse effects on wind turbine generator set components during frequency regulation.

Description

Technical Field

[0001] This disclosure relates to the field of wind power generation, and in particular to a method and apparatus for primary frequency regulation control of a wind turbine generator set. Background Technology

[0002] While the frequency of traditional synchronous generators is relatively controllable, wind power exhibits random fluctuations on the supply side. Variable-speed constant-frequency wind turbines connect to the grid via back-back converters, decoupling the generator from the grid system and failing to suppress system frequency variations. The high proportion of renewable energy integration and the application of high-proportion power electronic devices result in power systems with low inertia and weak damping. The frequency stability issues of new power systems with power electronics are becoming increasingly prominent, necessitating grid frequency regulation for renewable energy power plants.

[0003] Existing technical solutions to this problem include: utilizing a corresponding active power control system and adding an independent control device at the wind farm grid connection point to achieve active power-frequency droop control, enabling it to participate in rapid grid frequency adjustments at the grid connection point. The frequency fast response control system sets a dead zone setpoint for frequency changes; when the frequency value changes beyond the dead zone, a rapid frequency response is achieved through a set frequency-active power piecewise linear function. However, in traditional methods, the dead zone setpoint and the actual active power change rate setpoint are set to fixed values, making real-time adjustment impossible based on frequency changes. When inertial response and primary frequency regulation occur, the unit's operating state changes, and active power regulation is achieved through converter or pitch operations, which can have a certain impact on the load on wind turbine components. This is especially true for older wind turbines that have been in operation for many years; frequent frequency regulation has adverse effects on these older components. Summary of the Invention

[0004] This disclosure aims to at least partially address one of the technical problems in the related art.

[0005] Therefore, the first objective of this disclosure is to propose a method for primary frequency regulation control of wind turbine generator sets, so as to change the problem that the fixed dead zone and active power variation rate cause significant adverse effects on wind turbine generator set components during ground frequency regulation.

[0006] The second objective of this disclosure is to provide a device for primary frequency regulation control of a wind turbine generator set.

[0007] The third objective of this disclosure is to propose an electronic device.

[0008] To achieve the above objectives, a first aspect of this disclosure provides a method for primary frequency regulation control of a wind turbine generator set, comprising:

[0009] Detect the power grid frequency and calculate the rate of change and the amount of change in the power grid frequency;

[0010] If the grid frequency change rate and the grid frequency change amount meet the requirements, then the frequency regulation dead zone and the frequency-active power change rate are corrected based on the grid frequency and the grid frequency change rate to obtain the target frequency-active power piecewise linear function.

[0011] The target active power is obtained based on the grid frequency and the target frequency-active power piecewise linear function, and the wind turbine generator set is frequency regulated based on the target active power.

[0012] In one embodiment of this disclosure, the requirements for the power grid frequency change rate and the power grid frequency change amount include that both the power grid frequency change rate and the power grid frequency change amount are greater than zero or both are less than zero.

[0013] In one embodiment of this disclosure, the step of correcting the frequency regulation dead zone and the frequency-active power change rate based on the grid frequency and the grid frequency change rate to obtain a target frequency-active power piecewise linear function includes: obtaining an upper limit threshold and a lower limit threshold for the grid frequency change rate; determining various correction scenarios based on the grid frequency change rate, the upper limit threshold, and the lower limit threshold; and, in each correction scenario, correcting the frequency regulation dead zone and the frequency-active power change rate based on the grid frequency and the grid frequency change rate to obtain the corresponding target frequency-active power piecewise linear function.

[0014] In one embodiment of this disclosure, determining various correction scenarios based on the power grid frequency change rate, the upper limit threshold of the power grid frequency change rate, and the lower limit threshold of the power grid frequency change rate includes: if the power grid frequency change rate is equal to the lower limit threshold of the power grid frequency change rate, it is determined as a first correction scenario; if the power grid frequency change rate is greater than the lower limit threshold of the power grid frequency change rate and less than the upper limit threshold of the power grid frequency change rate, it is determined as a second correction scenario; and if the power grid frequency change rate is equal to the upper limit threshold of the power grid frequency change rate, it is determined as a third correction scenario.

[0015] In one embodiment of this disclosure, in the first correction scenario, the current active power, the set grid frequency, the upper limit threshold of the dead zone of frequency change, the lower limit threshold of the frequency-active power change rate, the upper limit of the active power increase, and the lower limit of the active power decrease are obtained; based on the grid frequency, the current active power, the set grid frequency, the upper limit threshold of the dead zone of frequency change, the lower limit threshold of the frequency-active power change rate, the upper limit of the active power increase, and the lower limit of the active power decrease, the frequency dead zone and the frequency-active power change rate are corrected to obtain a first target frequency-active power piecewise linear function.

[0016] In one embodiment of this disclosure, in the second correction scenario, the upper limit threshold of the dead zone for frequency change, the lower limit threshold of the dead zone for frequency change, the lower limit threshold of the frequency-active power change rate, and the upper limit threshold of the frequency-active power change rate are obtained; a calculated value of the dead zone for frequency change is calculated based on the upper limit threshold of the dead zone for frequency change, the lower limit threshold of the dead zone for frequency change, the upper limit threshold of the grid frequency change rate, and the lower limit threshold of the grid frequency change rate; a calculated value of the frequency-active power change rate is calculated based on the lower limit threshold of the frequency-active power change rate, the upper limit threshold of the frequency-active power change rate, the upper limit threshold of the grid frequency change rate, and the lower limit threshold of the grid frequency change rate; the frequency dead zone and the frequency-active power change rate are corrected based on the grid frequency, the current active power, the set grid frequency, the calculated value of the dead zone for frequency change, the calculated value of the frequency-active power change rate, the upper limit of the active power increase, and the lower limit of the active power decrease, to obtain a second target frequency-active power piecewise linear function.

[0017] In one embodiment of this disclosure, during the third correction scenario, the current active power, the set grid frequency, the lower limit threshold of the dead zone for frequency change, the upper limit threshold of the frequency-active power change rate, the upper limit of the active power increase, and the lower limit of the active power decrease are obtained. Based on the grid frequency, the current active power, the set grid frequency, the lower limit threshold of the dead zone for frequency change, the upper limit threshold of the frequency-active power change rate, the upper limit of the active power increase, and the lower limit of the active power decrease, the frequency dead zone and the frequency-active power change rate are corrected to obtain a third target frequency-active power piecewise linear function.

[0018] To achieve the above objectives, a second aspect of this disclosure provides an apparatus for primary frequency regulation control of a wind turbine generator set, comprising:

[0019] The module is used to detect the power grid frequency and calculate the rate of change and the amount of change in the power grid frequency.

[0020] The correction module is used to correct the frequency regulation dead zone and the frequency-active power change rate based on the grid frequency and the grid frequency change amount if the grid frequency change rate and the grid frequency change amount meet the requirements, so as to obtain the target frequency-active power piecewise linear function.

[0021] The determination module is used to obtain the target active power based on the grid frequency and the target frequency-active power piecewise linear function, and to perform primary frequency regulation on the wind turbine generator based on the target active power.

[0022] In one embodiment of this disclosure, the correction module, when correcting the frequency regulation dead zone and the frequency-active power change rate based on the grid frequency and the grid frequency change rate to obtain a target frequency-active power piecewise linear function, is specifically used for: obtaining an upper limit threshold and a lower limit threshold of the grid frequency change rate; determining various corresponding correction scenarios based on the grid frequency change rate, the upper limit threshold, and the lower limit threshold; and, in each correction scenario, correcting the frequency regulation dead zone and the frequency-active power change rate based on the grid frequency and the grid frequency change rate to obtain the corresponding target frequency-active power piecewise linear function.

[0023] To achieve the above objectives, a third aspect of this disclosure provides an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to enable the at least one processor to perform a method for primary frequency regulation control of a wind turbine generator according to a first aspect of this disclosure.

[0024] In one or more embodiments of this disclosure, the grid frequency is detected, and the grid frequency change rate and the amount of grid frequency change are calculated. If the grid frequency change rate and the amount of grid frequency change meet the requirements, the frequency regulation dead zone and the frequency-active power change rate are corrected based on the grid frequency and the grid frequency change rate to obtain a target frequency-active power piecewise linear function. The target active power is obtained based on the grid frequency and the target frequency-active power piecewise linear function, and the wind turbine generator is frequency regulated once based on the target active power. In this case, the variation of the grid frequency change rate is linked with the set dead zone value and the active power change rate value to obtain the corrected frequency-active power piecewise linear function, which solves the problem that the fixed dead zone and active power change rate cause a large adverse impact on the wind turbine generator components during frequency regulation.

[0025] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the specific embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, wherein:

[0027] Figure 1 A flowchart illustrating a method for primary frequency regulation control of a wind turbine generator set provided in an embodiment of this disclosure;

[0028] Figure 2 A schematic flowchart illustrating another method for primary frequency regulation control of a wind turbine generator set provided in an embodiment of this disclosure;

[0029] Figure 3 A schematic diagram of the first target frequency-active power piecewise linear function for the first correction case provided in the embodiments of this disclosure;

[0030] Figure 4 A schematic diagram of the second target frequency-active power piecewise linear function for the second correction scenario provided in this embodiment of the disclosure;

[0031] Figure 5 A schematic diagram of the third target frequency-active power piecewise linear function for the third correction case provided in the embodiments of this disclosure;

[0032] Figure 6 A block diagram of a device for primary frequency regulation control of a wind turbine generator set provided in an embodiment of this disclosure;

[0033] Figure 7 This is a block diagram of an electronic device used to implement the method for primary frequency regulation control of a wind turbine generator set according to embodiments of the present disclosure. Detailed Implementation

[0034] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with those of this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the embodiments of this disclosure as detailed in the appended claims.

[0035] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined. It should also be understood that the term "and / or" as used in this disclosure refers to and includes any or all possible combinations of one or more associated listed items.

[0037] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting this disclosure.

[0038] This disclosure provides a method and apparatus for primary frequency regulation control of a wind turbine generator set, the main purpose of which is to change the problem that the fixed dead zone and active power variation rate cause significant adverse effects on the components of the wind turbine generator set during frequency regulation.

[0039] In the first embodiment, Figure 1 This is a flowchart illustrating a method for primary frequency regulation control of a wind turbine generator set provided in an embodiment of this disclosure. Figure 1 As shown, the method for primary frequency regulation control of this wind turbine generator includes the following steps:

[0040] Step S11: Detect the power grid frequency and calculate the power grid frequency change rate and the amount of power grid frequency change.

[0041] Specifically, in step S11, the grid frequency and the corresponding time are detected, and the grid frequency change rate and the grid frequency change amount are obtained based on the grid frequency and the corresponding time. The detected grid frequency can be represented by the symbol f. The grid frequency change rate can be represented by the symbol deltaF_rate, and the grid frequency change amount can be represented by the symbol deltaF.

[0042] In step S11, the power grid frequency can be detected according to a set detection cycle.

[0043] Figure 2 This is a flowchart illustrating another method for primary frequency regulation control of a wind turbine generator provided in an embodiment of this disclosure. In other embodiments, such as... Figure 2As shown, before obtaining the grid frequency change rate and grid frequency change amount in step S11, the function flag bit Fenable can be checked to see if it is 1 in the current detection cycle. If it is 1, it indicates that the control function is enabled, and the grid frequency change rate deltaF_rate and grid frequency change amount deltaF can be obtained in step S11. If it is not 1, the logic ends.

[0044] Step S12: If the grid frequency change rate and the amount of grid frequency change meet the requirements, then based on the grid frequency and the grid frequency change rate, correct the frequency regulation dead zone and the frequency-active power change rate to obtain the target frequency-active power piecewise linear function.

[0045] In some embodiments, the grid frequency change rate and grid frequency change amount in step S12 meet the requirements including that both the grid frequency change rate and grid frequency change amount are greater than zero or both are less than zero.

[0046] Specifically, such as Figure 2 As shown, it can be determined whether the grid frequency change rate deltaF_rate is greater than 0, and simultaneously whether the grid frequency change amount deltaF is greater than 0. When both the grid frequency change rate deltaF_rate and the grid frequency change amount deltaF are greater than 0 or less than 0 (i.e., the grid frequency change rate and the frequency change amount have the same sign), then the grid frequency change rate and the grid frequency change amount meet the requirements, and the surface frequency change amount and the direction of change are the same (i.e., the direction and trend of frequency change are the same). It is necessary to redefine the frequency-active power piecewise linear function (i.e., it is necessary to correct the frequency regulation dead zone and the frequency-active power change rate); if they are not both greater than 0 or not both less than 0, then the logic ends.

[0047] In some embodiments, step S12, which corrects the frequency regulation dead zone and the frequency-active power change rate based on the grid frequency and the grid frequency change rate to obtain a target frequency-active power piecewise linear function, includes: obtaining an upper limit threshold and a lower limit threshold for the grid frequency change rate; determining various correction scenarios based on the grid frequency change rate, the upper limit threshold, and the lower limit threshold; and, among the various correction scenarios, correcting the frequency regulation dead zone and the frequency-active power change rate based on the grid frequency and the grid frequency change rate to obtain the corresponding target frequency-active power piecewise linear function. Specifically, determining various correction scenarios based on the grid frequency change rate, the upper limit threshold, and the lower limit threshold includes: if the grid frequency change rate equals the lower limit threshold, it is determined as a first correction scenario; if the grid frequency change rate is greater than the lower limit threshold and less than the upper limit threshold, it is determined as a second correction scenario; and if the grid frequency change rate equals the upper limit threshold, it is determined as a third correction scenario. Figure 2 As shown, the upper / lower limit thresholds of the power grid frequency change rate, deltaF_rate_max / min, are obtained, and various corresponding correction scenarios are determined. The first correction scenario is when the power grid frequency change rate deltaF_rate is equal to the lower limit threshold deltaF_rate_min; the second correction scenario is when the power grid frequency change rate deltaF_rate is between the upper limit threshold deltaF_rate_max and the lower limit threshold deltaF_rate_min; and the third correction scenario is when the power grid frequency change rate deltaF_rate is equal to the upper limit threshold deltaF_rate_max.

[0048] In some embodiments, during the first correction scenario, the current active power, the set grid frequency, the upper limit threshold of the dead zone for frequency change, the lower limit threshold of the frequency-active power change rate, the upper limit of the active power increase, and the lower limit of the active power decrease are obtained. Based on the grid frequency, current active power, set grid frequency, upper limit threshold of the dead zone for frequency change, lower limit threshold of the frequency-active power change rate, upper limit of the active power increase, and lower limit of the active power decrease, the frequency dead zone and the frequency-active power change rate are corrected to obtain a first target frequency-active power piecewise linear function. Here, the current active power is represented by the symbol Pt, the set grid frequency is 50Hz, the upper limit threshold of the dead zone for frequency change is represented by the symbol deadband_max, the lower limit threshold of the frequency-active power change rate is represented by the symbol slope_min, the upper limit of the active power increase is represented by the symbol Power_up, and the lower limit of the active power decrease is represented by the symbol Power_down.

[0049] Specifically, Figure 3 This is a schematic diagram of a first target frequency-active power piecewise linear function for a first correction scenario provided in an embodiment of this disclosure. The horizontal axis represents the grid frequency in Hz, and the vertical axis represents active power in MW.

[0050] When the first correction occurs, such as Figure 3 As shown, when the detected grid frequency f is within the range of (50-deadband_max, 50+deadband_max), the active power command P is equal to the current active power value Pt.

[0051] When the first correction occurs, such as Figure 3As shown, when the detected grid frequency f is within the range of (50-deadband_max+Power_up / slope_min, 50-deadband_max), the active power command P is equal to Pt+slope_min*[f-(50-deadband_max)].

[0052] When the first correction occurs, such as Figure 3 As shown, when the detected grid frequency f is in the range of (-∞, 50 - deadband_max + Power_up / slope_min), the active power command P is equal to Pt + Power_up;

[0053] When the first correction occurs, such as Figure 3 As shown, when the detected grid frequency f is within the range of (50+deadband_max, 50+deadband_max+Power_down / slope_min), the active power command P is equal to Pt+slope_min*[f-(50+deadband_max)].

[0054] When the first correction occurs, such as Figure 3 As shown, when the detected grid frequency f is in the range of (50 + deadband_max + Power_down / slope_min, +∞), the active power command P is equal to Pt + Power_down.

[0055] By adjusting the active power command P in each frequency range when the first correction occurs, the frequency dead zone and the frequency-active power change rate are corrected, and finally the detected grid frequency f and the first target frequency-active power piecewise linear function of the active power command P are obtained.

[0056] In some embodiments, during the second correction scenario, the upper limit threshold of the dead zone for frequency change, the lower limit threshold of the dead zone for frequency change, the lower limit threshold of the frequency-active power change rate, and the upper limit threshold of the frequency-active power change rate are obtained; the calculated value of the dead zone for frequency change is calculated based on the upper limit threshold of the dead zone for frequency change, the lower limit threshold of the dead zone for frequency change, the upper limit threshold of the grid frequency change rate, and the lower limit threshold of the grid frequency change rate; the calculated value of the frequency-active power change rate is calculated based on the lower limit threshold of the frequency-active power change rate, the upper limit threshold of the frequency-active power change rate, the upper limit threshold of the grid frequency change rate, and the lower limit threshold of the grid frequency change rate; the frequency dead zone and the frequency-active power change rate are corrected based on the grid frequency, the current active power, the set grid frequency, the calculated value of the dead zone for frequency change, the calculated value of the frequency-active power change rate, the upper limit of the active power increase, and the lower limit of the active power decrease, to obtain a second target frequency-active power piecewise linear function. Among them, the lower limit threshold of the dead zone of frequency change is represented by the symbol deadband_min, the upper limit threshold of the frequency-active power change rate is represented by the symbol slope_max, the calculated value of the dead zone of frequency change is represented by the symbol deadband_cal, and the calculated value of the frequency-active power change rate is represented by the symbol slope_cal.

[0057] Specifically, Figure 4 This is a schematic diagram of the second target frequency-active power piecewise linear function for the second modified case provided in this embodiment of the disclosure. The horizontal axis represents the grid frequency in Hz, and the vertical axis represents active power in MW.

[0058] When the second correction occurs, the deadband value of the frequency change, deadband_cal, is determined by interpolation between (deltaF_rate_min, deltaF_rate_max) and (deadband_min, deadband_max). The slope_cal value of the frequency-active power change rate is determined by interpolation between (deltaF_rate_min, deltaF_rate_max) and (slope_min, slope_max). If linear interpolation is used, the calculations are as follows: deadband_cal = (deadband_max - deadband_min) / (deltaF_rate_max - deltaF_rate_min) * (deltaF_rate - deltaF_rate_min) + deadband_min; slope_cal = (slope_max - slope_min) / (deltaF_rate_max - deltaF_rate_min) * (deltaF_rate - deltaF_rate_min) + slope_min. In other embodiments, spline interpolation or similar methods can be used to obtain the frequency modulation dead zone and the frequency-active power change rate.

[0059] When the second correction occurs, such as Figure 4 As shown, when the detected grid frequency f is within the range of (50-deadband_cal, 50+deadband_cal), the active power command P is equal to the current active power value Pt.

[0060] When the second correction occurs, such as Figure 4 As shown, when the detected grid frequency f is within the range of (50-deadband_cal+Power_up / slope_cal, 50-deadband_cal), the active power command P is equal to Pt+slope_cal*[f-(50-deadband_cal)].

[0061] When the second correction occurs, such as Figure 4 As shown, when the detected grid frequency f is in the range of (-∞, 50 - deadband_cal + Power_up / slope_cal), the active power command P is equal to the current active power value Pt + Power_up;

[0062] When the second correction occurs, such as Figure 4As shown, when the detected grid frequency f is in the range of (50+deadband_cal, 50+deadband_cal+Power_down / slope_cal), the active power command P is equal to Pt+slope_cal*[f-(50+deadband_cal)].

[0063] When the second correction occurs, such as Figure 4 As shown, when the detected grid frequency f is in the range of (50 + deadband_cal + Power_down / slope_cal, +∞), the active power command P is equal to Pt + Power_down.

[0064] By adjusting the active power command P in each frequency range when the second correction occurs, the frequency dead zone and the frequency-active power change rate are corrected, and finally the detected grid frequency f and the second target frequency-active power piecewise linear function of the active power command P are obtained.

[0065] In some embodiments, in the third correction case, the current active power, the set grid frequency, the lower limit threshold of the dead zone for frequency change, the upper limit threshold of the frequency-active power change rate, the upper limit of the active power increase, and the lower limit of the active power decrease are obtained; based on the grid frequency, the current active power, the set grid frequency, the lower limit threshold of the dead zone for frequency change, the upper limit threshold of the frequency-active power change rate, the upper limit of the active power increase, and the lower limit of the active power decrease, the frequency dead zone and the frequency-active power change rate are corrected to obtain a third target frequency-active power piecewise linear function. Wherein,

[0066] Specifically, Figure 5 This is a schematic diagram of the third target frequency-active power piecewise linear function for the third correction scenario provided in this embodiment of the disclosure. The horizontal axis represents the grid frequency in Hz, and the vertical axis represents active power in MW.

[0067] When the third correction occurs, such as Figure 5 As shown, when the detected grid frequency f is within the range of (50-deadband_min, 50+deadband_min), the active power command P is equal to the current active power value Pt.

[0068] When the third correction occurs, such as Figure 5 As shown, when the detected grid frequency f is within the range of (50-deadband_min+Power_up / slope_max, 50-deadband_min), the active power command P is equal to Pt+slope_max*[f-(50-deadband_min)].

[0069] When the third correction occurs, such as Figure 5 As shown, when the detected grid frequency f is in the range of (-∞, 50 - deadband_min + Power_up / slope_max), the active power command P is equal to Pt + Power_up;

[0070] When the third correction occurs, such as Figure 5 As shown, when the detected grid frequency f is within the range of (50+deadband_min, 50+deadband_min+Power_down / slope_max), the active power command P is equal to Pt+slope_max*[f-(50+deadband_min)].

[0071] When the third correction occurs, such as Figure 5 As shown, when the detected grid frequency f is within the range of (50 + deadband_min + Power_down / slope_max, +∞), the active power command P is equal to Pt + Power_down.

[0072] By adjusting the active power command P in each frequency range when the third correction occurs, the frequency dead zone and the frequency-active power change rate are corrected, and finally the third target frequency-active power piecewise linear function of the detected grid frequency f and active power command P is obtained.

[0073] In step S12, the upper limit of the active power increase and the lower limit of the active power decrease are fixed values. However, the embodiments of this disclosure are not limited to this method. For example, the upper limit of the active power increase and the lower limit of the active power decrease can also be dynamically adjustable.

[0074] In step S12, the same frequency-active power change rate method is used for both the upward and downward adjustment of active power. However, the embodiments of this disclosure are not limited to this method. For example, different frequency-active power change rate methods can be used in the process of upward and downward adjustment of active power.

[0075] In step S12, the frequency regulation dead zone and frequency-active power change rate are used for scheduling. The frequency regulation parameters are selected to meet the requirements of the simulated load of the wind turbine generator set. However, the embodiments of this disclosure are not limited to this method. For example, the frequency regulation parameters can be scheduled in real time by load sensor.

[0076] Step S13: Obtain the target active power based on the grid frequency and the target frequency-active power piecewise linear function, and perform primary frequency regulation on the wind turbine generator based on the target active power.

[0077] In step S13, the target frequency-active power piecewise linear function is determined according to the corresponding correction of the detected grid frequency f. The active power value P corresponding to the target frequency-active power piecewise linear function (also known as the primary frequency regulation active power response curve) is obtained using the detected grid frequency f. Then, the active power value P is sent to the power control system as the target active power to perform primary frequency regulation (i.e., active power frequency regulation) on the wind turbine generator set.

[0078] In step S13, the active power command value (i.e., the target active power) is directly transmitted to the power control system. However, the embodiments of this disclosure are not limited to this method. For example, the active power command value can be directly transmitted to the pitch actuator and the converter actuator.

[0079] In step S13, frequency regulation active power control can be performed on a single wind turbine generator set. It can also be used at the wind farm level. When controlling at the wind farm level, it is necessary to calculate the frequency regulation active power control command for the entire wind farm and transmit it to the individual wind turbine generator set through the energy management platform or other means for execution of the active power command.

[0080] In the primary frequency regulation control method for wind turbine generator sets according to this embodiment, the grid frequency is detected, and the grid frequency change rate and the amount of grid frequency change are calculated. If the grid frequency change rate and the amount of grid frequency change meet the requirements, the frequency regulation dead zone and the frequency-active power change rate are corrected based on the grid frequency and the grid frequency change rate to obtain a target frequency-active power piecewise linear function. The target active power is obtained based on the grid frequency and the target frequency-active power piecewise linear function, and the wind turbine generator set is subjected to primary frequency regulation based on the target active power. In this case, the variation of the grid frequency change rate is innovatively linked with the set dead zone value and the active power change rate value to obtain the corrected frequency-active power piecewise linear function (i.e., the frequency-active power piecewise linear function is redefined), which solves the problem that the fixed dead zone and active power change rate cause a large adverse impact on the wind turbine generator set components during frequency regulation. Compared to traditional methods, this approach uses the grid frequency change rate to schedule (i.e. correct) the frequency regulation dead zone and the frequency-active power change rate. This allows the turbine to calculate the frequency regulation active power command based on the corresponding frequency-active power piecewise linear function when facing different grid frequency changes. This approach takes into account the increased load caused by the frequent operation of converter and pitch actuators in older wind turbines due to the fixed frequency regulation dead zone and frequency-active power change rate, thus improving the grid-friendliness of older wind turbines. By employing a scheduling method that utilizes the frequency regulation dead zone and the frequency-active power change rate, this approach overcomes the problems of frequent actuator operation caused by fixed frequency regulation dead zones and frequency-active power change rates in traditional methods. It fully considers the actual needs of scheduling the frequency regulation dead zone and frequency-active power change rate under different grid frequency variations, thus resolving component damage caused by frequent execution of frequency regulation commands during wind turbine frequency regulation. This satisfies the requirement of both active power frequency regulation and stable and safe operation throughout the wind turbine's service life. Different control parameters can be set to achieve active power frequency regulation response for wind turbines within the remaining service life limits, enabling older wind turbines to also provide active power frequency regulation capabilities.

[0081] The following are embodiments of the apparatus disclosed herein, which can be used to execute embodiments of the method disclosed herein. For details not disclosed in the apparatus embodiments of this disclosure, please refer to the embodiments of the method disclosed herein.

[0082] Please see Figure 6 , Figure 6 This is a block diagram of a wind turbine generator primary frequency regulation control device provided in an embodiment of this disclosure. The wind turbine generator primary frequency regulation control device 10 includes an acquisition module 11, a correction module 12, and a determination module 13, wherein:

[0083] Module 11 is used to detect the power grid frequency and calculate the rate of change and the amount of change in the power grid frequency.

[0084] Correction module 12 is used to correct the frequency regulation dead zone and frequency-active power change rate based on the grid frequency and grid frequency change rate if the grid frequency change rate and grid frequency change amount meet the requirements, and obtain the target frequency-active power piecewise linear function.

[0085] The determination module 13 is used to obtain the target active power based on the grid frequency and the target frequency-active power piecewise linear function, and to perform primary frequency regulation on the wind turbine generator based on the target active power.

[0086] Optionally, when the correction module 13 corrects the frequency regulation dead zone and the frequency-active power change rate based on the grid frequency and the grid frequency change rate to obtain the target frequency-active power piecewise linear function, it is specifically used to: obtain the upper limit threshold and the lower limit threshold of the grid frequency change rate; determine the corresponding correction situations based on the grid frequency change rate, the upper limit threshold of the grid frequency change rate, and the lower limit threshold of the grid frequency change rate; and in the various correction situations, correct the frequency regulation dead zone and the frequency-active power change rate based on the grid frequency and the grid frequency change rate to obtain the corresponding target frequency-active power piecewise linear function.

[0087] It should be noted that the explanation of the above-described method embodiment for primary frequency regulation control of wind turbine generator sets also applies to the device for primary frequency regulation control of wind turbine generator sets in this embodiment, and will not be repeated here.

[0088] In the wind turbine generator primary frequency regulation control device of this disclosure embodiment, the acquisition module detects the grid frequency and calculates the grid frequency change rate and the amount of grid frequency change; the correction module is used to correct the frequency regulation dead zone and the frequency-active power change rate based on the grid frequency and the grid frequency change rate if the grid frequency change rate and the amount of grid frequency change meet the requirements, and obtain the target frequency-active power piecewise linear function; the determination module obtains the target active power based on the grid frequency and the target frequency-active power piecewise linear function, and performs primary frequency regulation on the wind turbine generator based on the target active power. In this case, the variation of the grid frequency change rate is innovatively linked with the set dead zone value and the active power change rate value to obtain the corrected frequency-active power piecewise linear function (i.e., redefining the frequency-active power piecewise linear function), which solves the problem that the fixed dead zone and active power change rate cause a large adverse impact on the wind turbine generator components during frequency regulation. Compared to traditional methods, this approach uses the grid frequency change rate to schedule (i.e. correct) the frequency regulation dead zone and the frequency-active power change rate. This allows the turbine to calculate the frequency regulation active power command based on the corresponding frequency-active power piecewise linear function when facing different grid frequency changes. This approach takes into account the increased load caused by the frequent operation of converter and pitch actuators in older wind turbines due to the fixed frequency regulation dead zone and frequency-active power change rate, thus improving the grid-friendliness of older wind turbines. By employing a scheduling method that utilizes the frequency regulation dead zone and the frequency-active power change rate, this approach overcomes the problems of frequent actuator operation caused by fixed frequency regulation dead zones and frequency-active power change rates in traditional methods. It fully considers the actual needs of scheduling the frequency regulation dead zone and frequency-active power change rate under different grid frequency variations, thus resolving component damage caused by frequent execution of frequency regulation commands during wind turbine frequency regulation. This satisfies the requirement of both active power frequency regulation and stable and safe operation throughout the wind turbine's service life. Different control parameters can be set to achieve active power frequency regulation response for wind turbines within the remaining service life limits, enabling older wind turbines to also provide active power frequency regulation capabilities.

[0089] According to embodiments of this disclosure, this disclosure also provides an electronic device, a readable storage medium, and a computer program product.

[0090] Figure 7This is a block diagram of an electronic device used to implement the method for primary frequency regulation control of a wind turbine generator according to embodiments of the present disclosure. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable electronic devices, and other similar computing devices. The components, connections and relationships between components, and functions shown in this disclosure are merely illustrative and are not intended to limit the implementation of the present disclosure as described and / or claimed herein.

[0091] like Figure 7 As shown, the electronic device 20 includes a computing unit 21, which can perform various appropriate actions and processes based on a computer program stored in a read-only memory (ROM) 22 or a computer program loaded from a storage unit 28 into a random access memory (RAM) 23. The RAM 23 may also store various programs and data required for the operation of the electronic device 20. The computing unit 21, ROM 22, and RAM 23 are interconnected via a bus 24. An input / output (I / O) interface 25 is also connected to the bus 24.

[0092] Multiple components in electronic device 20 are connected to I / O interface 25, including: input unit 26, such as keyboard, mouse, etc.; output unit 27, such as various types of monitors, speakers, etc.; storage unit 28, such as disk, optical disk, etc., which is communicatively connected to computing unit 21; and communication unit 29, such as network card, modem, wireless transceiver, etc. Communication unit 29 allows electronic device 20 to exchange information / data with other electronic devices through computer networks such as the Internet and / or various telecommunications networks.

[0093] The computing unit 21 can be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the computing unit 21 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The computing unit 21 performs the various methods and processes described above, such as performing a method for primary frequency regulation control of a wind turbine generator. For example, in some embodiments, the method for primary frequency regulation control of a wind turbine generator can be implemented as a computer software program tangibly contained in a machine-readable medium, such as storage unit 28. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 20 via ROM 22 and / or communication unit 29. When the computer program is loaded into RAM 23 and executed by the computing unit 21, one or more steps of the method for primary frequency regulation control of a wind turbine generator described above can be performed. Alternatively, in other embodiments, the computing unit 21 may be configured by any other suitable means (e.g., by means of firmware) to perform a method of primary frequency control of a wind turbine generator.

[0094] Various embodiments of the systems and techniques described above in this disclosure can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic electronic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include: implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0095] The program code used to implement the methods of this disclosure may be written in any combination of one or more programming languages. This program code may be provided to a processor or controller of a general-purpose computer, special-purpose computer, or other programmable data processing apparatus, such that when executed by the processor or controller, the program code causes the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may be executed entirely on a machine, partially on a machine, as a standalone software package partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0096] In this disclosure, a machine-readable medium can be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or electronic device. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. Machine-readable media can be, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or electronic devices, or any suitable combination of the foregoing. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage electronics, magnetic storage electronics, or any suitable combination of the foregoing.

[0097] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device for displaying information to the user (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor); and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the computer. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0098] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or middleware components (e.g., application servers), or frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), the Internet, and blockchain networks.

[0099] Computer systems can include clients and servers. Clients and servers are generally geographically separated and typically interact via communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. A server can be a cloud server, also known as a cloud computing server or cloud host, a hosting product within the cloud computing service ecosystem, addressing the shortcomings of traditional physical hosts and VPS (Virtual Private Server, or simply "VPS") services, such as high management difficulty and weak business scalability. Servers can also be servers for distributed systems or servers incorporating blockchain technology.

[0100] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this disclosure can be achieved, and this disclosure does not impose any limitations herein.

[0101] The specific embodiments described above do not constitute a limitation on the scope of protection of this disclosure. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A method of primary frequency regulation control of a wind turbine generator system, characterized in that, The method comprises the following steps: detecting the grid frequency, and calculating the grid frequency change rate and the grid frequency change amount; if the grid frequency change rate and the grid frequency change amount meet the requirements, correcting the frequency modulation dead zone and the frequency-active power change rate based on the grid frequency and the grid frequency change rate to obtain a target frequency-active power broken line function, wherein if the grid frequency change rate and the grid frequency change amount are both greater than zero or both less than zero, the grid frequency change rate and the grid frequency change amount meet the requirements, and the frequency change direction and the change trend are the same, the target frequency-active power broken line function is obtained, including: obtaining the upper limit threshold of the grid frequency change rate and the lower limit threshold of the grid frequency change rate; determining corresponding various correction conditions according to the grid frequency change rate, the upper limit threshold of the grid frequency change rate and the lower limit threshold of the grid frequency change rate; in various correction conditions, correcting the frequency modulation dead zone and the frequency-active power change rate based on the grid frequency and the grid frequency change rate to obtain a corresponding target frequency-active power broken line function; obtaining a target active power based on the grid frequency and the target frequency-active power broken line function, and performing primary frequency modulation on the wind turbine generator set based on the target active power.

2. The method of wind turbine primary frequency regulation control according to claim 1, wherein, The method for determining corresponding various correction conditions according to the grid frequency change rate, the upper limit threshold of the grid frequency change rate and the lower limit threshold of the grid frequency change rate comprises: if the grid frequency change rate is equal to the lower limit threshold of the grid frequency change rate, determining a first correction condition; if the grid frequency change rate is greater than the lower limit threshold of the grid frequency change rate and less than the upper limit threshold of the grid frequency change rate, determining a second correction condition; if the grid frequency change rate is equal to the upper limit threshold of the grid frequency change rate, determining a third correction condition.

3. The method for primary frequency modulation control of the wind turbine generator set according to claim 2, characterized in that: in the first correction condition, obtaining the current active power, the set grid frequency, the upper limit threshold of the frequency change amount dead zone, the lower limit threshold of the frequency-active power change rate, the upper limit of the active power up-regulation amplitude and the lower limit of the active power down-regulation amplitude; correcting the frequency modulation dead zone and the frequency-active power change rate based on the grid frequency, the current active power, the set grid frequency, the upper limit threshold of the frequency change amount dead zone, the lower limit threshold of the frequency-active power change rate, the upper limit of the active power up-regulation amplitude and the lower limit of the active power down-regulation amplitude to obtain a first target frequency-active power broken line function.

4. The method for primary frequency modulation control of the wind turbine generator set according to claim 2, characterized in that: in the second correction condition, obtaining the current active power, the set grid frequency, the upper limit threshold of the frequency change amount dead zone, the lower limit threshold of the frequency change amount dead zone, the lower limit threshold of the frequency-active power change rate, the upper limit threshold of the frequency-active power change rate; calculating the frequency change amount dead zone calculation value based on the upper limit threshold of the frequency change amount dead zone, the lower limit threshold of the frequency change amount dead zone, the upper limit threshold of the grid frequency change rate and the lower limit threshold of the grid frequency change rate. The frequency-active power change rate calculation value is calculated based on a frequency-active power change rate lower threshold value, a frequency-active power change rate upper threshold value, a power grid frequency change rate upper threshold value, and a power grid frequency change rate lower threshold value. The second target frequency-active power broken line function is obtained based on the power grid frequency, the current active power, the set power grid frequency, the frequency change amount dead band calculation value, the frequency-active power change rate calculation value, an active power up-regulation amplitude upper limit, an active power down-regulation amplitude lower limit, a frequency regulation dead band correction, and a frequency-active power change rate.

5. The method of claim 2, wherein, In the third correction case, the current active power, the set power grid frequency, a frequency change amount dead band lower threshold value, a frequency-active power change rate upper threshold value, an active power up-regulation amplitude upper limit, and an active power down-regulation amplitude lower limit are obtained. The third target frequency-active power broken line function is obtained based on the power grid frequency, the current active power, the set power grid frequency, the frequency change amount dead band lower threshold value, the frequency-active power change rate upper threshold value, the active power up-regulation amplitude upper limit, the active power down-regulation amplitude lower limit, a frequency regulation dead band correction, and a frequency-active power change rate.

6. A device for primary frequency regulation control of a wind power generator unit, characterized in that, comprising: The obtaining module is configured to detect the power grid frequency, and calculate the power grid frequency change rate and the power grid frequency change amount. The correction module is configured to, if the power grid frequency change rate and the power grid frequency change amount meet a requirement, correct a frequency regulation dead band and a frequency-active power change rate based on the power grid frequency and the power grid frequency change rate to obtain a target frequency-active power broken line function, wherein if the power grid frequency change rate and the power grid frequency change amount are both greater than zero or both less than zero, the power grid frequency change rate and the power grid frequency change amount meet the requirement, the frequency change direction and the change trend are the same, and the target frequency-active power broken line function is obtained, including: The power grid frequency change rate upper threshold value and the power grid frequency change rate lower threshold value are obtained. Various correction cases are determined according to the power grid frequency change rate, the power grid frequency change rate upper threshold value, and the power grid frequency change rate lower threshold value. In each correction case, a corresponding target frequency-active power broken line function is obtained by correcting a frequency regulation dead band and a frequency-active power change rate based on the power grid frequency and the power grid frequency change rate. The determining module is configured to obtain a target active power based on the power grid frequency and the target frequency-active power broken line function, and perform primary frequency regulation on the wind power generator set based on the target active power.

7. An electronic device, comprising: comprising: at least one processor; and a memory connected with the at least one processor in communication; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method of primary frequency regulation control of the wind power generator set according to any one of claims 1-5.

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