Method, device and system for primary frequency regulation of wind turbine generator set

Abstract

The present invention provides a method, device and system for primary frequency regulation of a wind turbine generator set. By coordinating the adjustment of the wind turbine and the single-machine energy storage device configured for the wind turbine, the response speed of power regulation can be improved, the function of rapid active power regulation can be realized, the primary frequency regulation and active power control requirements of the wind farm can be met, and the grid disconnection caused by the generator speed of the wind turbine being too low can be avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine generator set control, and in particular to a method, device and system for primary frequency regulation of a wind turbine generator set. Background Art

[0002] The production, transmission, distribution, and conversion of electrical energy into other forms of energy occur simultaneously. The instantaneous power generated in a power system must equal the power consumed at that same moment. The simultaneous nature of power generation, supply, and consumption necessitates a constant balance between these three elements, with power generation and supply increasing and decreasing with instantaneous increases and decreases in power consumption. When power generation is less than power consumption, the grid frequency decreases; when power generation exceeds power consumption, the grid frequency increases. Frequency fluctuations beyond a certain range not only threaten the security of the power system but also damage power-consuming equipment, reducing its service life.

[0003] With the large-scale deployment of wind power, the randomness, intermittency, and volatility of wind power output can easily lead to poor grid frequency stability in areas with weak power grids, which in turn affects the frequency of the entire power grid system. This requires wind turbines to have active power regulation capabilities, and at the same time, places higher demands on the speed and stability of active power regulation. However, due to the uncertainty of wind conditions, relying solely on wind turbines cannot meet the requirements of rapid response. Summary of the Invention

[0004] The present invention solves the problem that the existing wind turbine generator set itself is difficult to meet the requirement of rapid response.

[0005] In order to solve the above problems, the present invention provides a method for primary frequency regulation of a wind turbine generator set, which is applied to a wind turbine generator set equipped with a single-machine energy storage device. The method comprises: determining a wind turbine power variation value and an energy storage power variation value according to a power variation amount to be regulated by the wind turbine generator set, a first power calibration value of the wind turbine, and a second power calibration value of the energy storage device; the initial values of the first power calibration value and the second power calibration value are both zero; determining a wind turbine power set value according to the wind turbine power variation value and the initial wind turbine power value of the wind turbine; and determining a wind turbine power set value according to the energy storage power variation value and the energy storage power of the energy storage device. The method comprises the following steps: determining an energy storage power set value based on an initial value of the wind speed rate, and adjusting the operating states of the wind turbine and the energy storage device according to the wind turbine power set value and the energy storage power set value; obtaining an actual wind turbine power value and an actual energy storage power measured value; calculating a first difference between the actual wind turbine power measured value and the wind turbine power set value, and a second difference between the actual energy storage power measured value and the energy storage power set value; if the sum of the first difference and the second difference is greater than the power change, changing the first power calibration value or the second power calibration value according to the magnitude of the first difference and the second difference; and executing the above steps in a loop.

[0006] Optionally, changing the first power calibration value or the second power calibration value according to the size of the first difference and the second difference includes: if the sum of the first difference and the second difference is greater than the power change, and the first difference is greater than half of the power change, then updating the first power calibration value to the total power difference; the total power difference is obtained by subtracting the power change from the sum of the first difference and the second difference; if the sum of the first difference and the second difference is greater than the power change, and the second difference is greater than half of the power change, then updating the second power calibration value to the total power difference.

[0007] Optionally, changing the first power calibration value or the second power calibration value according to the size of the first difference and the second difference includes: if the sum of the first difference and the second difference is greater than the power change, and the first difference is greater than the second difference, updating the first power calibration value to a first preset value; if the sum of the first difference and the second difference is greater than the power change, and the second difference is greater than the second difference, updating the second power calibration value to a second preset value; the first preset value and the second preset value are both greater than zero.

[0008] Optionally, the wind turbine power change value and the energy storage power change value are determined respectively according to the power change amount to be adjusted by the wind turbine generator set, the first power calibration value of the wind turbine, and the second power calibration value of the energy storage device, including: subtracting the first power calibration value of the wind turbine from the power change amount to obtain the wind turbine power change value; subtracting the second power calibration value of the energy storage device from the power change amount to obtain the energy storage power change value.

[0009] Optionally, the method further includes: if the sum of the first difference and the second difference is less than or equal to the power change, maintaining the first power calibration value and the second power calibration value at zero.

[0010] Optionally, the method further includes: collecting the initial value of the wind turbine power and the initial value of the energy storage power at the moment of triggering a frequency modulation.

[0011] Optionally, the method further includes: receiving the power change determined by the wind farm dispatching device according to the power grid frequency change.

[0012] The present invention provides a device for primary frequency regulation of a wind turbine generator set, which is applied to a wind turbine generator set equipped with a single-machine energy storage device, comprising: a power change determination module, which is used to determine a wind turbine power change value and an energy storage power change value according to a power change amount to be adjusted by the wind turbine generator set, a first power calibration value of the wind turbine, and a second power calibration value of the energy storage device; the initial values of the first power calibration value and the second power calibration value are both zero; a power regulation module, which is used to determine a wind turbine power set value according to the wind turbine power change value and the initial wind turbine power value of the wind turbine, and to determine an energy storage power set value according to the energy storage power change value and the initial energy storage power value of the energy storage device , and adjust the operating status of the fan and the energy storage device according to the fan power given value and the energy storage power given value; an actual measurement acquisition module, used to obtain the fan power measured value and the energy storage power measured value; a difference calculation module, used to calculate the first difference between the fan power measured value and the fan power given value, and the second difference between the energy storage power measured value and the energy storage power given value; a calibration module, used to change the first power calibration value or the second power calibration value according to the size of the first difference and the second difference if the sum of the first difference and the second difference is greater than the power change; a loop module, used to cyclically trigger the operation of the above modules.

[0013] Optionally, the calibration module is specifically used to: if the sum of the first difference and the second difference is greater than the power change, and the first difference is greater than half of the power change, then update the first power calibration value to the total power difference; the total power difference is obtained by subtracting the power change from the sum of the first difference and the second difference; if the sum of the first difference and the second difference is greater than the power change, and the second difference is greater than half of the power change, then update the second power calibration value to the total power difference.

[0014] The present invention provides a primary frequency regulation system for a wind turbine generator set, comprising a single-machine integrated energy module, a wind turbine control module and an energy storage device control module; the single-machine integrated energy module is used to execute the above-mentioned primary frequency regulation method for the wind turbine generator set.

[0015] The method, device and system for primary frequency regulation of a wind turbine generator set provided in the embodiments of the present invention can improve the response speed of power regulation and realize the function of rapid active power regulation by coordinated regulation of the wind turbine and the single-machine energy storage device configured for the wind turbine, thereby meeting the primary frequency regulation and active power control requirements of the wind farm and avoiding disconnection from the grid due to excessively low generator speed of the wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0017] Figure 1 This is a general schematic diagram of active power regulation in a wind farm according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of data flow for active power regulation in a wind farm according to an embodiment of the present invention;

[0019] Figure 3 is a schematic flow chart of a method for primary frequency regulation of a wind turbine generator set according to an embodiment of the present invention;

[0020] Figure 4 This is a flow chart of a method for frequency modulation of a single-machine integrated energy module in accordance with an embodiment of the present invention;

[0021] Figure 5 Schematic diagram of power variation during a primary frequency modulation process of a wind turbine generator set according to an embodiment of the present invention;

[0022] Figure 6The figure is a structural diagram of a device for primary frequency modulation of a wind turbine generator set according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is given in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] The embodiment of the present invention provides a method and system for primary frequency regulation of a wind turbine generator set based on single-machine energy storage, and the wind turbine generator set may include the following devices:

[0025] Energy storage system, including batteries, temperature control system, fire protection system and converter; wind turbine, i.e. impeller; tower; nacelle, including transmission chain system, power generation system, yaw system and braking system and other related equipment; sensor system, including but not limited to wind speed and direction measuring device, generator speed sensor, voltage transformer and current transformer; control system, including input and output modules, controller, communication interface module and communication bus and other control-related equipment.

[0026] In order to meet the requirements of primary frequency regulation, the active power control instruction change rate of the wind farm dispatching equipment will be relatively large. At this time, wind turbines using existing active power regulation technology may have two problems: one is the long power regulation response time. After the active power control system gives a control instruction, the unit will respond after a certain delay. The length of the delay time is related to the actual active power of the unit at that time. Communication delay is not considered here; the other is that during the rapid adjustment of active power, due to excessive and rapid retraction of the blades, the generator speed may easily be lower than the cut-out speed, resulting in grid disconnection.

[0027] In order to solve the above problems, the present invention adds a single-machine energy storage device to the wind turbine generator set and provides a primary frequency modulation method for rapid coordinated regulation of active power.

[0028] Figure 1 The figure shows an overall schematic diagram of active power regulation in a wind farm. The wind farm dispatching equipment sends an active power instruction to the single-machine integrated energy module. After receiving the active power instruction, the single-machine integrated energy module sends power regulation instructions to the wind turbine and energy storage device respectively. After receiving the power regulation instruction, the wind turbine control module of the wind turbine and the energy storage device control module of the energy storage device perform corresponding power regulation operations.

[0029] Figure 2This diagram shows the data flow for active power regulation in a wind farm. The power change refers to the power change that should be achieved based on the current power of a single unit, as determined by the wind farm dispatching equipment based on grid frequency fluctuations. The single-unit integrated energy module issues power commands to the wind turbines and energy storage devices based on their frequency, power, status, and rated power.

[0030] Figure 3 This is a schematic flow chart of a method for primary frequency modulation of a wind turbine generator set provided by an embodiment of the present invention. The method is applied to the above-mentioned wind turbine generator set equipped with a single-unit energy storage device, comprising:

[0031] S302 , determining a wind turbine power change value and an energy storage power change value respectively according to the power change amount to be adjusted by the wind turbine generator set, a first power calibration value of the wind turbine, and a second power calibration value of the energy storage device.

[0032] The power change required by the wind turbine generator set is calculated by the wind farm dispatching device based on the grid frequency. The wind turbine generator set and energy storage device can receive the power change determined by the wind farm dispatching device based on the grid frequency change.

[0033] The wind turbine and energy storage device are both regulated based on the total power change required by the wind turbine generator set. Combined with their corresponding power calibration values, the actual power change value can be obtained. This power calibration value is used to reversely adjust the power of the wind turbine and energy storage device when the total power change exceeds the aforementioned power change, thereby quickly reducing the total power change to equal the aforementioned power change, thereby completing the power regulation process. The initial values of the first and second power calibration values are both zero, and the calculation process of the two during the power regulation process is determined by step S310.

[0034] By adjusting the total power change amount that needs to be adjusted by the wind turbine generator set as the benchmark, the power change response speed of the wind turbine generator set can be improved. Combined with the first power calibration value and the second power calibration value that are continuously updated in subsequent steps, reverse adjustment can be performed when the overall power change amount is greater than the power change amount that actually needs to be adjusted, thereby ultimately achieving the purpose of keeping the overall power change amount equal to the power change amount.

[0035] Exemplarily, the power change value is calculated in the following manner: subtract the first power calibration value of the wind turbine from the above power change to obtain the wind turbine power change value; subtract the second power calibration value of the energy storage device from the above power change to obtain the energy storage power change value.

[0036] S304, determining a given wind power value based on the above-mentioned wind turbine power change value and the initial wind turbine power value of the wind turbine, determining a given energy storage power value based on the energy storage power change value and the initial energy storage power value of the energy storage device, and adjusting the operating status of the wind turbine and the energy storage device based on the given wind power value and the given energy storage power value.

[0037] The initial value of the fan power is the fan power at the time when the frequency modulation is triggered once, and the initial value of the energy storage power is the energy storage power at the time when the frequency modulation is triggered once. If the power is to be increased, the power change value and the initial power value are obtained and then summed to obtain the fan power set value. If the power is to be reduced, the power change value and the initial power value are obtained and then the power change value is subtracted from the initial power value to obtain the fan power set value.

[0038] After obtaining the setpoints for wind turbine power and energy storage power, the wind turbine control module and the energy storage device control module of the wind turbine generator set respectively perform corresponding power regulation operations. By coordinating the wind turbine and its associated stand-alone energy storage device, the response speed of power regulation can be improved, the power regulation delay can be reduced, and if a stand-alone energy storage device is present, the grid disconnection caused by low generator speed can be avoided.

[0039] S306, obtaining the actual measured value of the wind turbine power and the actual measured value of the energy storage power.

[0040] During the above power adjustment operation, the actual measured value of the wind turbine power and the actual measured value of the energy storage power can be obtained according to a preset period, so as to adjust the wind turbine power and the energy storage power in real time.

[0041] S308, calculating a first difference between the actual measured value of the wind turbine power and the given value of the wind turbine power, and a second difference between the actual measured value of the energy storage power and the given value of the energy storage power.

[0042] The first and second differences represent the relationship between the power to be adjusted for the wind turbine and energy storage device and the power change (i.e., the target change), specifically, the relationship between the power change to be adjusted for the entire wind turbine and the target change, including situations where the power change is less than, equal to, or greater than the target. Generally, a reasonable adjustment target is for the power change to ultimately be zero.

[0043] S310: If the sum of the first difference and the second difference is greater than the power variation, change the first power calibration value or the second power calibration value according to the magnitudes of the first difference and the second difference.

[0044] As mentioned above, if the sum of the first difference and the second difference is greater than the power change, by changing the first power calibration value or the second power calibration value, the above-mentioned fan power change value and energy storage power change value are changed, thereby adjusting the fan power set value and energy storage power set value, and ultimately achieving the purpose of reducing the above-mentioned overall power to be changed.

[0045] The above steps are executed in a loop. The actual measured values of the fan power and the energy storage power are continuously detected and compared with the given values of the fan power and the energy storage power. When the corresponding difference is obtained, it is compared with the power change, thereby adjusting the given values of the fan power and the energy storage power respectively.

[0046] The method for primary frequency regulation of a wind turbine generator set provided in an embodiment of the present invention can improve the response speed of power regulation and realize the function of rapid active power regulation by coordinated regulation of the wind turbine and the single-machine energy storage device configured for the wind turbine, thereby meeting the primary frequency regulation and active power control requirements of the wind farm and avoiding disconnection from the grid due to excessively low generator speed of the wind turbine.

[0047] In the case where the sum of the first difference and the second difference is greater than the power variation, the first power calibration value or the second power calibration value may be determined in the following manner:

[0048] Method 1

[0049] (1) If the sum of the first difference and the second difference is greater than the power change, and the first difference is greater than half of the power change, the first power calibration value is updated to the total power difference. In this case, the second power calibration value can remain unchanged.

[0050] (2) If the sum of the first difference and the second difference is greater than the power change, and the second difference is greater than half of the power change, then the second power calibration value is updated to the total power difference. In this case, the first power calibration value can remain unchanged.

[0051] The total power difference is obtained by subtracting the power variation from the sum of the first difference and the second difference. The first difference, ie, the second difference, can be the absolute value of the difference between the actual power measurement value and the given power value.

[0052] Considering that the power regulation speed of wind turbines is slower than that of energy storage devices, the energy storage devices provide the majority of the power change in the initial phase, while the wind turbines contribute a smaller portion of the power change. As the wind turbines continue to adjust, their contribution to the power change gradually increases. During this process, the energy storage device's setpoint power needs to be reduced to ensure that the overall power change does not exceed the power change value issued by the wind farm dispatching device for an extended period of time. For example, the energy storage device ultimately stops supplying power, leaving the wind turbines as the sole power source.

[0053] When the same power variation is sent to both, the second difference between the actual storage power value of the energy storage device and the given storage power value is usually smaller than the first difference between the actual fan power value of the fan and the given fan power value.

[0054] When the sum of the first difference and the second difference is greater than the power variation, a determination to change the first power calibration value or the second power calibration value may be made based on either the first difference or the second difference being greater than half of the power variation. The power calibration value may be obtained by subtracting the power variation from the sum of the first difference and the second difference.

[0055] Method 2

[0056] (1) If the sum of the first difference and the second difference is greater than the power change, and the first difference is greater than the second difference, the first power calibration value is updated to the first preset value.

[0057] (2) If the sum of the first difference and the second difference is greater than the power change, and the second difference is greater than the second difference, the second power calibration value is updated to the second preset value.

[0058] Similar to Method 1 above, as the wind turbines continue to adjust, their power contribution gradually increases. During this process, the energy storage device's setpoint power must be reduced to ensure that the overall power change does not exceed the power change value issued by the wind farm dispatcher for an extended period. For example, the energy storage device ultimately ceases to provide power, leaving the wind turbines as the sole power source.

[0059] The judgment condition differs from that of Method 1. Here, the comparison result of the first difference and the second difference is used, and the power calibration value is a preset value. Optionally, both the first preset value and the second preset value are greater than zero. It should be noted that the first preset value and the second preset value can be fixed values or variable values, for example, the preset value changes with the number of updates.

[0060] Method 3

[0061] If the sum of the first difference and the second difference is less than or equal to the power variation, the first power calibration value and the second power calibration value are both maintained at zero.

[0062] Figure 4 This diagram shows a flow chart of a single-machine integrated energy module operating a primary frequency modulation method. The power change is the required power increase or decrease calculated based on the grid frequency, and the initial wind turbine power and energy storage power values are the wind turbine power and energy storage power values at the time the primary frequency modulation is triggered.

[0063] The power variation is simultaneously transmitted to the fan power variation given module and the energy storage power variation given module, and then summed with the fan power initial value and the energy storage power initial value respectively to obtain the fan power given value and the energy storage power given value.

[0064] The calculation process of the wind turbine power variation given module is: power variation - difference calibration module output value, and the calculation process of the energy storage power variation given module is: power variation - difference calibration module output value.

[0065] The calculation process of the difference module 1 is: the wind turbine measured power minus the wind turbine power setting, and the calculation process of the difference module 2 is: the energy storage measured power minus the energy storage power setting.

[0066] The operation process of the difference calibration module is as follows: when the sum of difference module 1 and difference module 2 is less than or equal to the power variable, the value transmitted to the power variation given module and the energy storage power variation given module is 0; when the sum of difference module 1 and difference module 2 is greater than the power variable, if difference module 1 is greater than power variation / 2, the value of difference module 1+difference module 2-power variation is transmitted to the energy storage power variation given module; if difference module 2 is greater than power variation / 2, the value of difference module 1+difference module 2-power variation is transmitted to the fan power variation given module.

[0067] The fan control algorithm and energy storage control algorithm in the above embodiments are beyond the scope of the present invention and will not be described in detail here.

[0068] Figure 5 The diagram shows the power variation during the primary frequency modulation process of a wind turbine generator set, which shows how the wind turbine power set value, energy storage power set value, wind turbine power measured value, and energy storage power measured value change over time.

[0069] like Figure 5 As shown, the power change is 200kw, the initial value of the fan power is 1000kw, the initial value of the energy storage power is 0, and the fan power set value and the energy storage power set value are both changed to the same power change, i.e. 200kw, in a short time.

[0070] The measured value of wind turbine power increases slowly over time, while the measured value of energy storage power increases faster than the measured value of wind turbine power. Figure 5 In the experiment, the total power reaches 1200kw in less than 0.5 seconds, which means the power regulation target is achieved. The measured value of the energy storage power reaches 200kw in about 0.5 seconds. Then, the given value of the energy storage power is affected by the second power calibration value and gradually decreases. The measured value of the energy storage power also decreases with the decrease of the given value of the energy storage power until it is reduced to 0. During this process, the given value of the fan power remains unchanged at 200kw, and the measured value of the fan power slowly rises to 200kw.

[0071] exist Figure 5 In the example, the 200 kW power regulation process is completed in less than 0.5 seconds. At this time, the energy storage device provides most of the power change. As time goes by, the total power exceeds the target 1200 kW and the energy storage power set value is reduced to maintain the total power around 1200 kW until the wind turbine completes the 200 kW power increase and the energy storage device exits the power output state.

[0072] The embodiments of the present invention can realize the function of rapid active power regulation, and lay a solid foundation for primary frequency regulation and active power control of wind farms.

[0073] Figure 6 A schematic structural diagram of a device for primary frequency modulation of a wind turbine generator set provided in an embodiment of the present invention, which is applied to a wind turbine generator set equipped with a single-unit energy storage device, includes:

[0074] A power change determination module 601 is configured to determine a wind turbine power change value and an energy storage power change value, respectively, based on the power change amount to be adjusted for the wind turbine generator set, a first power calibration value of the wind turbine, and a second power calibration value of the energy storage device; the initial values of the first power calibration value and the second power calibration value are both zero;

[0075] a power adjustment module 602, configured to determine a fan power set value based on the fan power change value and the initial fan power value of the fan, determine a storage power set value based on the energy storage power change value and the initial energy storage power value of the energy storage device, and adjust the operating states of the fan and the energy storage device based on the fan power set value and the energy storage power set value;

[0076] The actual measurement acquisition module 603 is used to obtain the actual measurement value of the wind turbine power and the actual measurement value of the energy storage power;

[0077] a difference calculation module 604 for calculating a first difference between the wind turbine power measured value and the wind turbine power set value, and a second difference between the energy storage power measured value and the energy storage power set value;

[0078] a calibration module 605 configured to change the first power calibration value or the second power calibration value according to the magnitude of the first difference and the second difference if the sum of the first difference and the second difference is greater than the power variation;

[0079] The loop module 606 is used to trigger the above modules to run in a loop.

[0080] Optionally, the calibration module is specifically used to: if the sum of the first difference and the second difference is greater than the power change, and the first difference is greater than half of the power change, then update the first power calibration value to the total power difference; the total power difference is obtained by subtracting the power change from the sum of the first difference and the second difference; if the sum of the first difference and the second difference is greater than the power change, and the second difference is greater than half of the power change, then update the second power calibration value to the total power difference.

[0081] Optionally, the calibration module is specifically used to: if the sum of the first difference and the second difference is greater than the power change, and the first difference is greater than the second difference, then update the first power calibration value to a first preset value; if the sum of the first difference and the second difference is greater than the power change, and the second difference is greater than the second difference, then update the second power calibration value to a second preset value; the first preset value and the second preset value are both greater than zero.

[0082] Optionally, the power regulation module is specifically used to: subtract the first power calibration value of the wind turbine from the power change to obtain the wind turbine power change value; subtract the second power calibration value of the energy storage device from the power change to obtain the energy storage power change value.

[0083] Optionally, the calibration module is further configured to: if the sum of the first difference and the second difference is less than or equal to the power variation, maintain the first power calibration value and the second power calibration value at zero.

[0084] Optionally, the above-mentioned device further includes a collection module, which is used to: collect the initial value of the wind turbine power and the initial value of the energy storage power at the moment of triggering a frequency modulation.

[0085] Optionally, the apparatus further includes a receiving module configured to receive the power variation determined by the wind farm dispatching device according to the power grid frequency variation.

[0086] An embodiment of the present invention also provides a primary frequency regulation system for a wind turbine generator set, comprising a single-machine integrated energy module, a wind turbine control module and an energy storage device control module; the single-machine integrated energy module is used to execute the above-mentioned primary frequency regulation method for a wind turbine generator set.

[0087] An embodiment of the present invention further provides a computer-readable storage medium storing a computer program. When executed by a processor, the computer program implements the various processes of the above-described embodiments and achieves the same technical effects. To avoid repetition, the details are not described here. The computer-readable storage medium may be, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0088] Of course, those skilled in the art will understand that all or part of the processes of the above embodiments can be implemented by instructing the control device through a computer program, and the program can be stored in a computer-readable storage medium. When the program is executed, it may include the processes of the above-mentioned method embodiments, wherein the storage medium may be a memory, a disk, an optical disk, etc.

[0089] Finally, it should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or device comprising the element.

[0090] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0091] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for primary frequency modulation of a wind turbine generator set, characterized in that: Applied to a wind turbine generator set equipped with a single-unit energy storage device, the method includes: Determine the wind turbine power change value and the energy storage power change value respectively according to the power change amount to be adjusted by the wind turbine generator set, the first power calibration value of the wind turbine, and the second power calibration value of the energy storage device; the initial values of the first power calibration value and the second power calibration value are both zero; Determining a fan power set value according to the fan power change value and the initial fan power value of the fan, determining a storage power set value according to the energy storage power change value and the initial energy storage power value of the energy storage device, and adjusting the operating states of the fan and the energy storage device according to the fan power set value and the energy storage power set value; Obtain the actual measured values of wind turbine power and energy storage power; Calculating a first difference between the actual wind turbine power value and the given wind turbine power value, and a second difference between the actual energy storage power value and the given energy storage power value; If the sum of the first difference and the second difference is greater than the power variation, changing the first power calibration value or the second power calibration value according to the magnitude of the first difference and the second difference; Execute the above steps repeatedly.

2. The method according to claim 1, characterized in that Changing the first power calibration value or the second power calibration value according to the magnitude of the first difference and the second difference includes: If the sum of the first difference and the second difference is greater than the power variation, and the first difference is greater than half of the power variation, updating the first power calibration value to a total power difference; the total power difference is obtained by subtracting the power variation from the sum of the first difference and the second difference; If the sum of the first difference and the second difference is greater than the power variation, and the second difference is greater than half of the power variation, the second power calibration value is updated to the total power difference.

3. The method according to claim 1, characterized in that Changing the first power calibration value or the second power calibration value according to the magnitude of the first difference and the second difference includes: If the sum of the first difference and the second difference is greater than the power variation, and the first difference is greater than the second difference, updating the first power calibration value to a first preset value; If the sum of the first difference and the second difference is greater than the power variation, and the second difference is greater than the second difference, updating the second power calibration value to a second preset value; The first preset value and the second preset value are both greater than zero.

4. The method according to claim 1, wherein The step of determining the wind turbine power change value and the energy storage power change value respectively according to the power change amount to be adjusted by the wind turbine generator set, the first power calibration value of the wind turbine, and the second power calibration value of the energy storage device includes: Subtracting a first power calibration value of the fan from the power change to obtain a fan power change value; The second power calibration value of the energy storage device is subtracted from the power change to obtain an energy storage power change value.

5. The method according to claim 1, wherein The method further comprises: If the sum of the first difference and the second difference is less than or equal to the power variation, the first power calibration value and the second power calibration value are both maintained at zero.

6. The method according to claim 1, characterized in that The method further comprises: At the moment of triggering a frequency modulation, the initial value of the wind turbine power and the initial value of the energy storage power are collected.

7. The method according to claim 1, characterized in that The method further comprises: The power variation determined by the wind farm dispatching device according to the power grid frequency variation is received.

8. A device for primary frequency modulation of a wind turbine generator set, characterized in that: Applicable to wind turbines equipped with stand-alone energy storage devices, including: a power change determination module, configured to determine a wind turbine power change value and an energy storage power change value, respectively, based on the power change amount to be adjusted by the wind turbine generator set, a first power calibration value of the wind turbine, and a second power calibration value of the energy storage device; the initial values of the first power calibration value and the second power calibration value are both zero; a power regulation module, configured to determine a fan power set value based on the fan power change value and the initial fan power value of the fan, determine a storage power set value based on the energy storage power change value and the initial energy storage power value of the energy storage device, and regulate the operating states of the fan and the energy storage device based on the fan power set value and the energy storage power set value; The actual measurement acquisition module is used to obtain the actual measured values of wind turbine power and energy storage power; a difference calculation module, configured to calculate a first difference between the actual wind turbine power value and the given wind turbine power value, and a second difference between the actual energy storage power value and the given energy storage power value; a calibration module, configured to change the first power calibration value or the second power calibration value according to the magnitude of the first difference and the second difference if the sum of the first difference and the second difference is greater than the power variation; The loop module is used to trigger the above modules to run in a loop.

9. The device according to claim 8, characterized in that The calibration module is specifically used for: If the sum of the first difference and the second difference is greater than the power variation, and the first difference is greater than half of the power variation, updating the first power calibration value to a total power difference; the total power difference is obtained by subtracting the power variation from the sum of the first difference and the second difference; If the sum of the first difference and the second difference is greater than the power variation, and the second difference is greater than half of the power variation, the second power calibration value is updated to the total power difference.

10. A primary frequency modulation system for a wind turbine generator set, characterized in that: Including single-machine integrated energy module, fan control module and energy storage equipment control module; The single-machine integrated energy module is used to execute the primary frequency regulation method of a wind turbine generator set as described in any one of claims 1-7.

Images