Control method and device based on fan power limitation, equipment and storage medium

Abstract

The application provides a kind of based on fan power limit control method, device, equipment and storage medium, belong to wind power generation field, this method is as follows: obtain multiple wind speed measurement and multiple wind direction measurement;Multiple wind speed measurement is input to wind speed filter, and according to the output value of wind speed filter, a preset wind speed-power interpolation table is inquired, to determine the first power upper limit;According to the output value of wind speed filter, a preset wind speed-against wind deviation limit value interpolation table is inquired, to determine the against wind deviation limit value;Multiple wind direction measurement is input to wind direction filter to obtain the against wind deviation filter value;The against wind deviation limit value and the against wind deviation filter value are input to comparator, to determine the second power upper limit;According to preset control method and the first power upper limit and the second power upper limit, fan power is adjusted.The application can reduce the loss of fan by analyzing wind speed and combining preset control method, avoid damage of fan under extreme wind condition, improve the service life of fan.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, and in particular to a control method, device, equipment and storage medium based on wind turbine power limitation. Background Technology

[0002] Wind energy is a renewable energy source with enormous development value and application prospects in the new era. However, my country's complex geographical conditions necessitate the use of advanced technologies to fully realize the potential of wind energy. With the continuous development of disciplines such as mechanics and mechanical engineering, wind power generation technology has been further upgraded and transformed.

[0003] Wind turbines are typically constructed from lightweight and high-strength materials, making them highly flexible with minimal damping. They are easily subjected to external dynamic excitations, such as wind loads, which act continuously on the wind turbine throughout its lifespan. Under certain extreme conditions, overload can shorten the turbine's lifespan, and in severe cases, lead to its complete collapse. Summary of the Invention

[0004] This invention provides a control method, device, equipment, and storage medium based on wind turbine power limitation. By analyzing wind speed under different conditions, the upper limit of power corresponding to that wind speed is obtained. By combining the power upper limit obtained from the analysis with a preset control method, the operating state of the wind turbine can be better adjusted, reducing wind turbine losses, avoiding damage to the wind turbine under extreme wind conditions, and improving the service life of the wind turbine.

[0005] In a first aspect, embodiments of the present invention provide a control method based on wind turbine power limitation, the method comprising:

[0006] Acquire multiple wind speed measurements and multiple wind direction measurements;

[0007] Multiple wind speed measurements are input into the wind speed filter, and the first power upper limit is determined by querying the preset wind speed-power interpolation table based on the output value of the wind speed filter.

[0008] Based on the output value of the wind speed filter, the preset wind speed-wind deviation limit interpolation table is consulted to determine the wind deviation limit;

[0009] Multiple wind direction measurements are input into a wind direction filter to obtain a wind deviation filter value;

[0010] Input the wind deviation limit and the wind deviation filter value into the comparator to determine the second power limit;

[0011] The fan power is adjusted according to the preset control method and the first and second power limits.

[0012] Optionally, the wind deviation limit and the wind deviation filter value are input into the comparator to determine the second power upper limit, including:

[0013] If the wind deviation limit is greater than the wind deviation filter value, then the power change is calculated based on the wind deviation limit.

[0014] The second power upper limit is determined based on the amount of power change.

[0015] Optionally, the fan power is adjusted according to a preset control method and a first power limit and a second power limit, including:

[0016] In non-extreme wind conditions, the wind turbine power can be kept below the first power limit by adjusting the blade pitch angle or the torque of the wind turbine generator.

[0017] In extreme wind conditions, the blade pitch angle is adjusted according to the pitch control method to ensure that the turbine power does not exceed the second power limit.

[0018] Among them, the pitch control method includes one or more of the following: nonlinear pitch control method, pre-pitch control method, and variable parameter pitch control method.

[0019] Optionally, under extreme wind conditions, the blade pitch angle is adjusted according to the pitch control method to ensure that the turbine power does not exceed the second power limit, including:

[0020] When the wind turbine is running above the preset rated wind speed, a nonlinear pitch control method is adopted to reduce the wind turbine power and reduce the wind turbine load by adjusting the blade pitch angle.

[0021] When the wind turbine is running within the preset wind speed range, the blade pitch angle is adjusted using a pre-variable pitch control method.

[0022] Among them, the preset rated wind speed is within the preset wind speed range;

[0023] When the speed deviation of the wind turbine generator exceeds the preset deviation value, a variable parameter pitch control method is adopted. The parameters in the pitch control are adjusted according to the speed deviation value to reduce the overshoot of the pitch angle and reduce the wind turbine load.

[0024] Optionally, the classification of the generator operating status of the wind turbine includes:

[0025] The first interval is the interval where the speed and torque increase upon entry.

[0026] The second interval is the interval with the optimal tip speed ratio.

[0027] The third range is the rated speed torque ramp-up range;

[0028] The fourth range is the constant power control range above the rated power.

[0029] Optionally, the switching of the generator operating status of the wind turbine includes:

[0030] When the generator is first connected to the grid, its operating status is in the first interval;

[0031] When the generator is operating in the first interval and the generator power exceeds the minimum generator power in the second interval, the generator operating status is switched to the second interval.

[0032] When the generator is operating in the second range and the generator speed reaches the rated speed, the generator operating state switches to the third range.

[0033] When the generator is operating in the second interval and the generator speed drops to the cut-in speed and the generator torque is lower than the minimum torque in the second interval, the generator operating state switches to the first interval.

[0034] When the generator is operating in the third interval and the generator torque reaches the rated torque, the generator operating state switches to the fourth interval.

[0035] When the generator is operating in the third interval and the generator speed is lower than the rated speed and the generator torque is less than the minimum torque in the second interval, the generator operating state switches to the second interval.

[0036] When the generator is operating in the fourth interval and the generator torque is less than the rated torque and the pitch angle becomes the minimum pitch angle, the generator operating state switches to the third interval.

[0037] Thirdly, embodiments of the present invention provide a control device based on wind turbine power limitation, the device comprising:

[0038] The acquisition module is used to acquire multiple wind speed measurements and multiple wind direction measurements;

[0039] The determination module is used to input multiple wind speed measurements into the wind speed filter and, based on the output value of the wind speed filter, query a preset wind speed-power interpolation table to determine the first power upper limit;

[0040] The determination module is also used to query a preset wind speed-wind deviation limit interpolation table based on the output value of the wind speed filter to determine the wind deviation limit;

[0041] The determination module is also used to input multiple wind direction measurements into the wind direction filter to obtain the wind deviation filter value;

[0042] The comparison module is used to input the wind deviation limit and the wind deviation filter value into the comparator to determine the second power limit.

[0043] The adjustment module is used to adjust the fan power according to the preset control method and the first power limit and the second power limit.

[0044] Optionally, the device further includes:

[0045] The switching module is used to ensure that the generator's operating status is in the first interval when it is first connected to the grid.

[0046] When the generator is operating in the first interval and the generator power exceeds the minimum generator power in the second interval, the generator operating status is switched to the second interval.

[0047] When the generator is operating in the second range and the generator speed reaches the rated speed, the generator operating state switches to the third range.

[0048] When the generator is operating in the second interval and the generator speed drops to the cut-in speed and the generator torque is lower than the minimum torque in the second interval, the generator operating state switches to the first interval.

[0049] When the generator is operating in the third interval and the generator torque reaches the rated torque, the generator operating state switches to the fourth interval.

[0050] When the generator is operating in the third interval and the generator speed is lower than the rated speed and the generator torque is less than the minimum torque in the second interval, the generator operating state switches to the second interval.

[0051] When the generator is operating in the fourth interval and the generator torque is less than the rated torque and the pitch angle becomes the minimum pitch angle, the generator operating state switches to the third interval.

[0052] The first interval is the cut-in speed and torque ramp-up interval; the second interval is the optimal tip speed ratio interval; the third interval is the rated speed and torque ramp-up interval; and the fourth interval is the constant power control interval above the rated power.

[0053] Thirdly, embodiments of the present invention provide an electronic device including a memory and a processor, wherein the memory stores a computer program, and the processor executes the program to implement the method as described in any of the implementations of the first aspect.

[0054] Fourthly, embodiments of the present invention provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method as described in any of the implementations of the first aspect.

[0055] This invention provides a control method, device, equipment, and storage medium based on wind turbine power limitation. By analyzing wind speeds under different conditions, the upper limit of power corresponding to that wind speed is obtained. By combining a preset control method with the analyzed upper limit of power, the operating state of the wind turbine can be better adjusted, reducing wind turbine losses, avoiding damage to the wind turbine under extreme wind conditions, and extending the wind turbine's service life. Furthermore, by dividing the wind turbine's operating state into intervals, the wind turbine can operate in its optimal state for as long as possible, further reducing wind turbine losses and extending its service life.

[0056] It should be understood that the description in the Summary of the Invention is not intended to limit the key or essential features of the embodiments of the present invention, nor is it intended to restrict the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0057] The above and other features, advantages, and aspects of the various embodiments of the present invention will become more apparent from the accompanying drawings and the following detailed description. In the drawings, the same or similar reference numerals denote the same or similar elements.

[0058] Figure 1 This is a schematic diagram illustrating the division of the operating state range of a wind turbine generator according to an embodiment of the present invention;

[0059] Figure 2 This is a flowchart of a control method based on wind turbine power limitation according to an embodiment of the present invention;

[0060] Figure 3 This is a flowchart illustrating the acquisition of the first power upper limit in a control method based on wind turbine power limitation according to an embodiment of the present invention;

[0061] Figure 4 This is a flowchart illustrating the acquisition of the second power upper limit in a control method based on wind turbine power limitation according to an embodiment of the present invention;

[0062] Figure 5 This is a schematic diagram of a control device based on wind turbine power limitation according to an embodiment of the present invention;

[0063] Figure 6 This is a structural diagram of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0064] To enable those skilled in the art to better understand the technical solutions in one or more embodiments of this specification, the technical solutions in one or more embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this specification, and not all of the embodiments. Based on one or more embodiments of this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this document.

[0065] It should be noted that the embodiments of the present invention are described only to more clearly illustrate the technical solutions of the embodiments of the present invention, and do not constitute a limitation on the technical solutions provided by the embodiments of the present invention.

[0066] Figure 1 This is a schematic diagram illustrating the division of the operating state range of a wind turbine generator according to an embodiment of the present invention, as shown below. Figure 1 As shown:

[0067] The first interval is AB, which is the range for the entry speed and torque ramp-up; the second interval is BC, which is the range for the optimal tip speed ratio; the third interval is CD, which is the range for the rated speed and torque ramp-up; and the fourth interval is EF, which is the range for constant power control above the rated power.

[0068] Optionally, the operating status of the wind turbine generator can be switched based on factors such as operating time, speed, torque power, and pitch angle.

[0069] Specifically, the switching logic for the wind turbine generator's operating state can be as follows: Upon initial grid connection, the generator operates in the first interval; when the generator is in the first interval and its power exceeds the minimum generator power in the second interval, the generator switches to the second interval; when the generator is in the second interval and its speed reaches the rated speed, the generator switches to the third interval; when the generator is in the second interval and its speed drops to the cut-off speed and its torque is lower than the minimum torque in the second interval, the generator switches to the first interval; when the generator is in the third interval and its torque reaches the rated torque, the generator switches to the fourth interval; when the generator is in the third interval and its speed is lower than the rated speed and its torque is less than the minimum torque in the second interval, the generator switches to the second interval; when the generator is in the fourth interval and its torque is less than the rated torque and its pitch angle becomes the minimum pitch angle, the generator switches to the third interval.

[0070] Optionally, the operating status of the wind turbine can be adjusted and the operating range of the wind turbine can be switched based on various meteorological conditions such as wind speed, wind direction, temperature, and humidity, combined with historical operating data of the unit and weather forecasts.

[0071] Figure 2 This is a flowchart illustrating a control method based on wind turbine power limitation according to an embodiment of the present invention. Figure 2 As shown, it includes:

[0072] S201. Obtain multiple wind speed measurements and multiple wind direction measurements.

[0073] For example, a wind vane can be used to measure wind direction, with the wind direction arrow on the wind vane indicating the current wind direction;

[0074] The measurement principle is as follows: whenever the wind vane forms an angle with the direction of the airflow, the airflow will exert a certain pressure on the tail of the wind vane. The magnitude of this pressure is proportional to the projection of the wind vane's geometry onto the plane perpendicular to the direction of the airflow. The windward area of ​​the head of the wind vane is smaller than that of the tail. The wind pressure will cause the wind vane to rotate around its vertical axis until it is parallel to the airflow. The wind direction can be easily observed from the relative position between the wind vane and the fixed main azimuth indicator.

[0075] For example, an anemometer can be used to measure wind speed; the measurement principle is as follows: the anemometer has a rectangular wind pressure plate, and a long and short toothed arc frame is installed next to the wind pressure plate. The number of long and short teeth raised by the wind pressure plate represents the wind force. The greater the wind force, the higher the wind speed level.

[0076] Alternatively, mechanical measurement, ultrasonic measurement, or calorimetric measurement methods can be used to measure wind direction and wind speed.

[0077] S202. Input multiple wind speed measurements into the wind speed filter, and query the preset wind speed-power interpolation table based on the output value of the wind speed filter to determine the first power upper limit.

[0078] Optionally, such as Figure 3 As shown, the wind speed measurement value is input into the wind speed filter. The wind speed filter filters the wind speed measurement value according to preset conditions. Based on the obtained filtered value, the preset wind speed-power interpolation table is consulted to find the power corresponding to the obtained filtered value. This power is the first power upper limit.

[0079] Optionally, the filtering process can be selected according to the measurement requirements, including but not limited to methods such as moving average or median filtering of the measurement values.

[0080] S203. Based on the output value of the wind speed filter, query the preset wind speed-wind deviation limit interpolation table to determine the wind deviation limit.

[0081] Optionally, such as Figure 4 As shown, the wind speed measurement value is input into the wind speed filter. The wind speed filter filters the wind speed measurement value according to preset conditions. Based on the obtained filtered value, the preset wind speed-wind deviation limit interpolation table is consulted to find the wind deviation limit corresponding to the obtained filtered value.

[0082] Optionally, the filtering process can be selected according to the measurement requirements, including but not limited to methods such as moving average or median filtering of the measurement values.

[0083] S204. Input multiple wind direction measurements into the wind direction filter to obtain the wind deviation filter value.

[0084] Optionally, such as Figure 4 As shown, the wind direction measurement value is input into the wind direction filter. The wind direction filter filters the wind direction measurement value according to preset conditions and obtains the wind deviation filter value.

[0085] Optionally, the filtering process can be selected according to the measurement requirements, including but not limited to methods such as moving average or median filtering of the measurement values.

[0086] S205. Input the wind deviation limit and the wind deviation filter value into the comparator to determine the second power limit.

[0087] Optionally, such as Figure 4 As shown, the wind deviation limit and the wind deviation filter value are input into the comparator. If the wind deviation limit is greater than the wind deviation filter value, the power change is calculated based on the wind deviation limit. The second power upper limit is determined based on the power change. If the wind deviation limit is less than or equal to the wind deviation filter value, no operation is performed.

[0088] S206. Adjust the fan power according to the preset control method and the first and second power limits.

[0089] Optionally, the fan power is adjusted according to a preset control method and a first power limit and a second power limit, including:

[0090] In non-extreme wind conditions, the wind turbine power can be kept below the first power limit by adjusting the blade pitch angle or the torque of the wind turbine generator.

[0091] In extreme wind conditions, the blade pitch angle is adjusted according to the pitch control method to ensure that the turbine power does not exceed the second power limit.

[0092] Among them, the pitch control method includes one or more of the following: nonlinear pitch control method, pre-pitch control method, and variable parameter pitch control method.

[0093] For example, when the wind turbine is running above the preset rated wind speed, a nonlinear pitch control method is used to reduce the wind turbine power and reduce the wind turbine load by adjusting the blade pitch angle.

[0094] Specifically, the blade pitch angle can be adjusted using the following formula:

[0095]

[0096] In the formula, K p K is the proportional adjustment coefficient. I θ is the integral adjustment coefficient, and θ is the pitch angle before adjustment. e To adjust the rear propeller pitch angle.

[0097] For example, when the wind turbine is running within a preset wind speed range, a pre-variable pitch control method is used to adjust the blade pitch angle; wherein, the preset rated wind speed is within the preset wind speed range;

[0098] Specifically, when the wind turbine is operating near the rated wind speed, the blade pitch angle changes significantly per unit wind speed. Considering the hysteresis effect of the pitch actuator, the wind turbine is prone to impact loads. Pitching the blades in advance when the wind speed is close to and below the rated wind speed can make the pitching action near the rated wind speed transition smoothly and reduce the impact load on the wind turbine.

[0099] To perform pre-pitch control, first determine the maximum value of the pre-pitch angle range, then set the average value of the rate of change of the pitch angle at a unit wind speed within the blade pitch range as the reference value of the rate of change of the pitch angle during pre-pitch control, and finally calculate the initial wind speed corresponding to the pre-pitch control.

[0100] The range of pre-pitch adjustment can be adjusted by analyzing and calculating the load under typical operating conditions. Wind speed measurement should not be used as the basis for judging pre-pitch adjustment. The correspondence between wind speed and power can be considered, and power measurement can be used as the basis for judging pre-pitch adjustment. An interpolation algorithm can be used to determine the blade pitch angle corresponding to the power at each time.

[0101] For example, when the speed deviation of the wind turbine generator is greater than the preset deviation value, a variable parameter pitch control method is adopted to adjust the parameters in the pitch control according to the speed deviation value, thereby reducing the overshoot of the pitch angle and reducing the wind turbine load.

[0102] Specifically, the parameters in the pitch control can be adjusted according to the magnitude of the motor speed deviation, thereby reducing the overshoot of the pitch angle and reducing the load on the wind turbine under extreme gust conditions; the adjustment formula is as follows:

[0103]

[0104] For example, when the motor speed deviation is less than or equal to R1, i.e., |a|≤R1, f(a) is set to 1. In this region, the motor speed changes relatively smoothly. In order to eliminate the steady-state error of the motor speed, the integral parameter needs to be set relatively large. When R1<|a|≤R1+R2, the integral coefficient needs to be reduced to reduce the overshoot of the blade pitch angle when a increases. When R1+R2<|a|≤R1+R2+R3, only the proportional element is retained in the PI pitch control. When R1+R2+R3<|a|≤R1+R2+R3+R4, if the actual value of the motor speed is significantly greater than its reference value, the blade pitch angle is increased to reduce the absorption of wind energy and prevent the wind turbine from overspeeding. When |a|>R1+R2+R3+R4, a larger integral parameter is needed to ensure that the blade can adjust the pitch in time to ensure the stable operation of the wind turbine.

[0105] Furthermore, if the measured motor speed is significantly lower than its reference value, the blades need to be pitched significantly to increase wind energy absorption, which requires increasing the integral coefficient.

[0106] It should be noted that the values ​​of R1, R2, R3 and R4 in the formula can be obtained from the analysis of historical pitch angle adjustment data.

[0107] This invention provides a control method based on wind turbine power limitation. The method includes: acquiring multiple wind speed measurements and multiple wind direction measurements; inputting the multiple wind speed measurements into a wind speed filter, and querying a preset wind speed-power interpolation table based on the output value of the wind speed filter to determine a first power upper limit; querying a preset wind speed-wind deviation limit interpolation table based on the output value of the wind speed filter to determine a wind deviation limit; inputting multiple wind direction measurements into a wind direction filter to obtain a wind deviation filter value; inputting the wind deviation limit and the wind deviation filter value into a comparator to determine a second power upper limit; and adjusting the wind turbine power according to a preset control method and the first and second power upper limits. This invention obtains the corresponding power upper limit under different wind speed conditions through wind speed analysis. By combining the power upper limit obtained from the analysis with a preset control method, the operating state of the wind turbine can be better adjusted, reducing wind turbine losses, avoiding damage to the wind turbine under extreme wind conditions, and improving the service life of the wind turbine.

[0108] The following combination Figure 5 This application provides a detailed description of the apparatus provided in the embodiments that can execute the above-described control method based on wind turbine power limitation.

[0109] For example, Figure 5 This is a schematic diagram of a control device based on wind turbine power limiting according to an embodiment of the present invention; as shown. Figure 5 As shown, the control device 50 includes:

[0110] The acquisition module 501 is used to acquire multiple wind speed measurements and multiple wind direction measurements;

[0111] The determination module 502 is used to input multiple wind speed measurement values ​​into the wind speed filter, and to query a preset wind speed-power interpolation table based on the output value of the wind speed filter to determine the first power upper limit;

[0112] The determination module 502 is also used to query a preset wind speed-wind deviation limit interpolation table based on the output value of the wind speed filter to determine the wind deviation limit.

[0113] The determination module 502 is also used to input multiple wind direction measurement values ​​into the wind direction filter to obtain the wind deviation filter value;

[0114] Comparison module 503 is used to input the wind deviation limit and the wind deviation filter value into the comparator to determine the second power limit;

[0115] The adjustment module 504 is used to adjust the fan power according to the preset control method and the first power limit and the second power limit.

[0116] Optionally, the device further includes: a switching module for ensuring that the generator operates in the first interval when it is first connected to the grid;

[0117] When the generator is operating in the first interval and the generator power exceeds the minimum generator power in the second interval, the generator operating status is switched to the second interval.

[0118] When the generator is operating in the second range and the generator speed reaches the rated speed, the generator operating state switches to the third range.

[0119] When the generator is operating in the second interval and the generator speed drops to the cut-in speed and the generator torque is lower than the minimum torque in the second interval, the generator operating state switches to the first interval.

[0120] When the generator is operating in the third interval and the generator torque reaches the rated torque, the generator operating state switches to the fourth interval.

[0121] When the generator is operating in the third interval and the generator speed is lower than the rated speed and the generator torque is less than the minimum torque in the second interval, the generator operating state switches to the second interval.

[0122] When the generator is operating in the fourth interval and the generator torque is less than the rated torque and the pitch angle becomes the minimum pitch angle, the generator operating state switches to the third interval.

[0123] The first interval is the cut-in speed and torque ramp-up interval; the second interval is the optimal tip speed ratio interval; the third interval is the rated speed and torque ramp-up interval; and the fourth interval is the constant power control interval above the rated power.

[0124] Optionally, the determining module 502 is further configured to calculate the power change based on the wind deviation limit if the wind deviation limit is greater than the wind deviation filter value; and determine the second power upper limit based on the power change.

[0125] Optionally, the adjustment module 504 is also used to adjust the blade pitch angle or the torque of the wind turbine generator to ensure that the wind turbine power does not exceed the first power limit under non-extreme wind conditions; and to adjust the blade pitch angle according to the pitch control method to ensure that the wind turbine power does not exceed the second power limit under extreme wind conditions.

[0126] Among them, the pitch control method includes one or more of the following: nonlinear pitch control method, pre-pitch control method, and variable parameter pitch control method.

[0127] Optionally, the adjustment module 504 is also used to reduce the power and load of the wind turbine by adjusting the blade pitch angle when the wind turbine is running above the preset rated wind speed using a nonlinear pitch control method; and to adjust the blade pitch angle by using a pre-pitch control method when the wind turbine is running within the preset wind speed range. The preset rated wind speed is within the preset wind speed range. When the speed deviation of the wind turbine generator is greater than the preset deviation value, a variable parameter pitch control method is used to adjust the parameters in the pitch control according to the speed deviation value, thereby reducing the overshoot of the pitch angle and reducing the wind turbine load.

[0128] This invention also provides a computer electronic device. Figure 6 A schematic diagram of the structure of an electronic device to which embodiments of the present invention can be applied is shown, such as... Figure 6 As shown, this computer electronic device includes a central processing unit (CPU) 601, which can perform various appropriate actions and processes based on programs stored in read-only memory (ROM) 602 or programs loaded from storage section 608 into random access memory (RAM) 603. The RAM 603 also stores various programs and data required for system operation. The CPU 601, ROM 602, and RAM 603 are interconnected via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0129] The following components are connected to I / O interface 605: an input section 606 including a keyboard, mouse, etc.; an output section 607 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section 608 including a hard disk, etc.; and a communication section 609 including a network interface card such as a LAN card, modem, etc. The communication section 609 performs communication processing via a network such as the Internet. A drive 610 is also connected to I / O interface 605 as needed. A removable medium 611, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on drive 610 as needed so that computer programs read from it can be installed into storage section 608 as needed.

[0130] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0131] The modules or modules described in the embodiments of the present invention can be implemented in software or hardware. The described modules or modules can also be housed in a processor. For example, a processor can be described as including an acquisition module 501, a determination module 502, a comparison module 503, and an adjustment module 504. The names of these modules do not necessarily limit the module itself; for example, the adjustment module 504 can also be described as "an adjustment module 504 for adjusting the power of a wind turbine according to a preset control method and a first power upper limit and a second power upper limit."

[0132] In another aspect, the present invention also provides a computer-readable storage medium, which may be the computer-readable storage medium included in the wind turbine power limitation control device described in the above embodiments; or it may be a standalone computer-readable storage medium not assembled into an electronic device. The computer-readable storage medium stores one or more programs, which are used by one or more processors to execute the wind turbine power limitation control method described in the present invention.

[0133] The above description is merely a preferred embodiment of the present invention and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention is not limited to the specific combination of the above-described technical features, but also includes other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in this invention.

Claims

1. A control method based on wind turbine power limitation, characterized in that, The method includes: Acquire multiple wind speed measurements and multiple wind direction measurements; The multiple wind speed measurements are input into the wind speed filter, and the first power upper limit is determined by querying a preset wind speed-power interpolation table based on the output value of the wind speed filter. Based on the output value of the wind speed filter, the preset wind speed-wind deviation limit interpolation table is consulted to determine the wind deviation limit; The multiple wind direction measurements are input into a wind direction filter to obtain a wind deviation filter value; The wind deviation limit and the wind deviation filter value are input into a comparator to determine the second power upper limit; the wind turbine power is adjusted according to a preset control method and the first and second power upper limits, specifically including: In non-extreme wind conditions, the wind turbine power is kept below the first power limit by adjusting the blade pitch angle or the torque of the wind turbine generator. In extreme wind conditions, the blade pitch angle is adjusted according to the pitch control method to ensure that the turbine power does not exceed the second power limit. The pitch control method includes one or more of the following: nonlinear pitch control method, pre-pitch control method, and variable parameter pitch control method. Specifically, this step includes: when the turbine operates above a preset rated wind speed, the nonlinear pitch control method is used to reduce turbine power and load by adjusting the blade pitch angle; when the turbine operates within a preset wind speed range, the pre-pitch control method is used to adjust the blade pitch angle; wherein the preset rated wind speed is within the preset wind speed range; when the turbine generator speed deviation is greater than a preset deviation value, the variable parameter pitch control method is used to adjust the parameters in the pitch control according to the speed deviation value, reducing pitch angle overshoot and turbine load.

2. The control method based on wind turbine power limitation according to claim 1, characterized in that, The step of inputting the wind deviation limit and the wind deviation filter value into the comparator to determine the second power upper limit includes: if the wind deviation limit is greater than the wind deviation filter value, then calculating the power change based on the wind deviation limit; The second power upper limit is determined based on the power change.

3. The fan speed control method according to claim 1, characterized in that, The classification of generator operating states for wind turbines includes: The first interval is the interval where the speed and torque increase upon entry. The second interval is the interval with the optimal tip speed ratio. The third range is the rated speed torque ramp-up range; The fourth range is the constant power control range above the rated power.

4. The fan speed control method according to claim 3, characterized in that, The switching of the generator operating status of the wind turbine includes: When the generator is first connected to the grid, its operating status is in the first interval; When the generator is operating in the first interval and the generator power exceeds the minimum generator power in the second interval, the generator operating state switches to the second interval. When the generator is operating in the second interval and the generator speed reaches the rated speed, the generator operating state switches to the third interval. When the generator is operating in the second interval and the generator speed drops to the cut-in speed and the generator torque is lower than the minimum torque in the second interval, the generator operating state switches to the first interval. When the generator is operating in the third interval and the generator torque reaches the rated torque, the generator operating state switches to the fourth interval. When the generator is operating in the third interval and the generator speed is lower than the rated speed and the generator torque is less than the minimum torque in the second interval, the generator operating state switches to the second interval. When the generator is operating in the fourth interval and the generator torque is less than the rated torque and the pitch angle becomes the minimum pitch angle, the generator operating state switches to the third interval.

5. A control device based on wind turbine power limitation, characterized in that, The apparatus for use in the method according to any one of claims 1-4 comprises: The acquisition module is used to acquire multiple wind speed measurements and multiple wind direction measurements; The determination module is used to input the multiple wind speed measurements into the wind speed filter, and to query a preset wind speed-power interpolation table based on the output value of the wind speed filter to determine the first power upper limit; The determining module is also used to query a preset wind speed-wind deviation limit interpolation table based on the output value of the wind speed filter to determine the wind deviation limit. The determining module is also used to input the plurality of wind direction measurement values ​​into the wind direction filter to obtain the wind deviation filter value; The comparison module is used to input the wind deviation limit and the wind deviation filter value into the comparator to determine the second power limit. The adjustment module is used to adjust the fan power according to the preset control method and the first power limit and the second power limit.

6. The control device based on wind turbine power limitation according to claim 5, characterized in that, The device also includes: The switching module is used to ensure that the generator's operating status is in the first interval when it is first connected to the grid. When the generator is operating in the first interval and the generator power exceeds the minimum generator power in the second interval, the generator operating state switches to the second interval. When the generator is operating in the second range and the generator speed reaches the rated speed, the generator operating state switches to the third range. When the generator is operating in the second interval and the generator speed drops to the cut-in speed and the generator torque is lower than the minimum torque in the second interval, the generator operating state switches to the first interval. When the generator is operating in the third interval and the generator torque reaches the rated torque, the generator operating state switches to the fourth interval. When the generator is operating in the third interval and the generator speed is lower than the rated speed and the generator torque is less than the minimum torque in the second interval, the generator operating state switches to the second interval. When the generator is operating in the fourth interval and the generator torque is less than the rated torque and the pitch angle becomes the minimum pitch angle, the generator operating state switches to the third interval. The first interval is the cut-in speed and torque ramp-up interval; the second interval is the optimal tip speed ratio interval; the third interval is the rated speed and torque ramp-up interval; and the fourth interval is the constant power control interval above the rated power.

7. An electronic device, characterized in that, The method includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the method as described in any one of claims 1 to 4.

8. A computer-readable storage medium, characterized in that, The device contains a computer program that, when executed by a processor, implements the method as described in any one of claims 1 to 4.

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