A variable pitch torque decoupling control method and wind power generation system

Abstract

The application discloses a kind of variable pitch torque decoupling control method and wind power generation system.Method includes: obtaining the current output power of generator;Judge whether the output power reaches rated power;If not, send first variable pitch control instruction to variable pitch control unit, to make variable pitch control unit control the blade pitch of wind wheel keeps minimum pitch angle, and send first torque control instruction to torque control unit, to make torque control unit increase the output torque of generator;If yes, send second torque control instruction to torque control unit, to make torque control unit control the output torque of generator keeps as rated torque, and send second variable pitch control instruction to variable pitch control unit, to adjust the pitch angle of blade pitch.The application realizes torque control and variable pitch control decoupling, solves the problem of mutual coupling of variable pitch control and torque control, improves the power output efficiency of generator.

Description

Technical Field

[0001] This invention relates to the field of wind power generation, and in particular to a pitch torque decoupling control method and a wind power generation system. Background Technology

[0002] With the rapid development of new and clean energy sources, wind power generation is becoming increasingly widely used due to its economic and environmental benefits. Wind power generation converts the kinetic energy of wind into mechanical kinetic energy, and then into electrical kinetic energy. Specifically, it uses wind power to drive the blades of a wind turbine to rotate, which in turn drives a generator to rotate, ultimately producing electricity.

[0003] The smaller the blade pitch angle, the larger the contact area between the blade and the wind, the stronger the ability to capture wind energy, and the greater the power output of the generator. At the same time, the generator's output power is directly proportional to its rotational speed and output torque.

[0004] In related technologies, pitch control is used to control the pitch angle, and torque control is used to adjust the generator's output torque, thereby adjusting the generator's output power. During the operation of the wind turbine and generator, pitch control and torque control can couple, causing them to influence each other and thus affecting the generator's power output. Summary of the Invention

[0005] To address the aforementioned technical problems and deficiencies, the purpose of this invention is to provide a pitch torque decoupling control method and a wind power generation system that can decouple pitch control and torque control, thereby solving the technical problem of mutual coupling between pitch control and torque control affecting the power output of the generator.

[0006] To achieve the above objectives, in a first aspect, the present invention provides a pitch torque decoupling control method applied to the main control unit of a wind power generation system. The wind power generation system further includes a wind turbine, a generator, a pitch control unit, and a torque control unit. The pitch torque decoupling control method includes:

[0007] Obtain the current output power of the generator;

[0008] Determine whether the output power reaches the rated power;

[0009] If not, a first pitch control command is sent to the pitch control unit to make the pitch control unit control the wind turbine blades to maintain the minimum pitch angle, and a first torque control command is sent to the torque control unit to make the torque control unit increase the generator output torque.

[0010] If so, a second torque control command is sent to the torque control unit to keep the generator's output torque at the rated torque, and a second pitch control command is sent to the pitch control unit to adjust the blade pitch angle.

[0011] Using the above embodiment, the generator's operation is divided into two phases: before reaching rated power and after reaching rated power. The wind turbine or generator is controlled in both phases. Before reaching rated power, pitch control is fixed, while torque control is adjusted separately. After reaching rated power, torque control is fixed, while pitch control is adjusted separately. This decoupling of torque control and pitch control in the two phases solves the problem of mutual coupling between pitch control and torque control, thus improving the generator's power output efficiency.

[0012] Optionally, before the step of sending the first torque control command to the torque control unit, the method further includes:

[0013] Obtain the generator speed;

[0014] The generator's operating phase is determined based on its rotational speed. The operating phase includes the startup phase, torque ramp-up phase, and rated speed phase.

[0015] The generator's output torque is determined based on its speed and operating stage.

[0016] The first torque control command is generated based on the output torque.

[0017] Using the above embodiments, the precise output torque can be obtained based on the generator's rotational speed. The first torque control command contains the output torque information. The torque control unit can control the generator's output torque to the corresponding value based on the output torque information in the first control command, thus achieving precise control of the generator's output torque.

[0018] Optionally, the step of determining the generator's output torque based on the generator's speed and operating stage includes:

[0019] Based on the operating phase, determine the torque-speed interpolation table for the torque and generator speed;

[0020] The output torque is determined based on the generator speed and torque speed interpolation table.

[0021] Using the above embodiments, the torque-speed interpolation tables are different for each of the startup, torque ramp-up, and rated speed stages. Therefore, once the generator is in a specific operating stage, the corresponding torque-speed interpolation table can be selected. This eliminates complex calculations and improves data processing efficiency and accuracy.

[0022] Optionally, the step of determining the generator's output torque based on the generator's speed and operating stage includes:

[0023] During the startup phase, when the generator speed reaches the startup speed, the output torque is determined to continue to increase, and the generator speed is maintained at the startup speed.

[0024] Using the above embodiment, before the generator speed reaches the starting speed, the output torque is [value missing]. After the speed reaches the starting speed, the output torque begins to increase continuously, allowing the generator's output power to increase continuously during this stage.

[0025] Optionally, during the startup phase, after determining that the output torque continues to increase and maintaining the generator speed at the startup speed when the generator speed reaches the startup speed, the method further includes:

[0026] When the output torque increases to the first torque threshold, it enters the torque ramp-up phase;

[0027] During the torque ramp-up phase, both the generator speed and output torque begin to increase until the generator speed reaches the rated speed.

[0028] Using the above embodiment, the generator maintains a constant starting speed, and the output torque begins to increase. When the output torque reaches the first torque threshold, it enters the torque ramp-up stage. Then, both the speed and torque begin to increase until the speed increases to the rated speed. During this stage, the generator's output power also begins to increase continuously.

[0029] Optionally, after the step of increasing both the generator speed and output torque during the torque ramp-up phase until the generator speed reaches the rated speed, the method further includes:

[0030] When the generator reaches its rated speed, it enters the rated speed stage, which keeps the generator speed at the rated speed.

[0031] The output torque is determined to continue increasing until it reaches the second torque threshold.

[0032] Using the above embodiment, the generator continuously increases its output torque at its rated speed, and its output power also continuously increases. When the output torque increases to the second threshold, the output power also reaches the rated power.

[0033] Optionally, before the step of sending the second pitch control command to the pitch control unit, the method further includes:

[0034] Obtain wind speed information;

[0035] Determine the pitch angle based on wind speed information and rated power;

[0036] The second pitch control command is generated based on the pitch angle.

[0037] In the above embodiment, the second pitch control command includes pitch angle information. The pitch control unit adjusts the blades to the corresponding pitch angle according to the pitch angle information in the second pitch control command, so as to adjust the wind turbine's wind energy capture capability and achieve precise control of the pitch angle.

[0038] Optionally, the step of determining the pitch angle based on wind speed information and rated power includes:

[0039] Call the table showing the correspondence between wind speed, rated power, and blade pitch angle;

[0040] Determine the propeller pitch angle based on wind speed, rated power, and the corresponding relationship table.

[0041] Using the above embodiment, the precise pitch angle can be obtained from the corresponding relationship table using wind speed and rated power. This eliminates the need for complex calculations and improves data processing efficiency.

[0042] Optionally, the steps for obtaining wind speed information include:

[0043] It receives wind speed information from a wind speed prediction model, which is used to predict wind speed for a future period based on wind speed information over a past period and current weather conditions.

[0044] Using the above embodiment, a wind speed prediction model is used to predict wind speed information over a future period. The main control unit sends the predicted wind speed information to the pitch control unit, allowing the blades to adjust their pitch angle in advance. This avoids the lag in pitch control and prevents large fluctuations in generator output power caused by untimely pitch angle changes when wind speed changes abruptly.

[0045] In a second aspect, the present invention provides a wind power generation system, including a main control unit, a wind turbine, a generator, a pitch control unit, and a torque control unit, wherein the main control unit includes:

[0046] The acquisition module is used to obtain the current output power of the generator;

[0047] The judgment module is used to determine whether the output power reaches the rated power;

[0048] The first instruction module is used to send a first pitch control instruction to the pitch control unit when the output power does not reach the rated power, so that the pitch control unit adjusts the blades of the wind turbine to maintain the minimum pitch angle, and sends a first torque control instruction to the torque control unit, so that the torque control unit increases the output torque of the generator.

[0049] The second instruction module is used to send a second torque control instruction to the torque control unit when the output power reaches the rated power, so that the torque control unit controls the generator output torque to maintain the rated torque, and sends a second pitch control instruction to the pitch control unit to adjust the blade pitch angle.

[0050] The above embodiments can achieve the technical effects of the above methods, which will not be elaborated here.

[0051] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0052] 1. The generator's operation is divided into two phases: before reaching rated power and after reaching rated power. The turbine or generator is controlled in both phases. Before reaching rated power, pitch control is fixed, while torque control is adjusted separately. After reaching rated power, torque control is fixed, while pitch control is adjusted separately. This decouples torque control and pitch control in the two phases, resolving the problem of their mutual coupling and improving the generator's power output efficiency.

[0053] 2. The precise output torque can be obtained based on the generator's speed. The first torque control command contains the output torque information. Based on the output torque information in the first control command, the torque control unit can control the generator's output torque to the corresponding value, thus achieving precise control of the generator's output torque.

[0054] 3. The second pitch control command contains pitch angle information. The pitch control unit adjusts the blades to the corresponding pitch angle according to the pitch angle information in the second pitch control command, so as to adjust the wind turbine's wind energy capture capability and achieve precise control of the pitch angle. Attached Figure Description

[0055] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0056] Figure 1 This is a schematic diagram of the architecture of a wind power generation system according to an embodiment of the present invention;

[0057] Figure 2 The flowchart of the pitch torque decoupling control method according to an embodiment of the present invention is as follows. Figure 1 ;

[0058] Figure 3 The flowchart of the pitch torque decoupling control method according to an embodiment of the present invention is as follows. Figure 2 ;

[0059] Figure 4 The flowchart of the pitch torque decoupling control method according to an embodiment of the present invention is as follows. Figure 3 ;

[0060] Figure 5 This is a schematic diagram of the architecture of a main control unit according to an embodiment of the present invention;

[0061] Figure 6 This is a schematic diagram of the architecture of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0062] The terminology used in the following embodiments of the present invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification and appended claims of the present invention, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to include the plural expressions as well, unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in the present invention refers to and includes any or all possible combinations of one or more of the listed items.

[0063] Hereinafter, the terms "first" and "second" are used for descriptive purposes only to distinguish technical features and should not be construed as implying relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, unless otherwise stated, "multiple" means two or more.

[0064] Wind power generation systems can convert the kinetic energy of wind into mechanical kinetic energy, and then into electrical kinetic energy. Specifically, wind power drives the blades of the wind turbine to rotate, and the rotation of the blades drives the generator to rotate, ultimately generating electricity.

[0065] Among these factors, the smaller the blade pitch angle, the larger the contact area between the blade and the wind, the stronger the ability to capture wind energy, and the greater the power output of the generator. Simultaneously, the generator's output power P is directly proportional to its rotational speed N and output torque T, specifically P = NTk, where k is a constant.

[0066] In related technologies, pitch control is used to control the pitch angle, and torque control is used to adjust the generator's output torque, thereby adjusting the generator's output power. During the operation of the wind turbine and generator, both pitch control and torque control affect the generator's power output. Therefore, pitch control and torque control are coupled and influence each other, thus affecting the generator's electrical energy output.

[0067] Therefore, this embodiment of the invention provides a pitch torque decoupling control method, which divides the operation of generator 2 into two phases: before reaching rated power and after reaching rated power. The wind turbine 3 or generator 2 is controlled in these two phases. Before generator 2 reaches rated power, pitch control is fixed, while torque control is adjusted separately. After reaching rated power, torque control is fixed, while pitch control is adjusted separately. This decoupling of torque control and pitch control in the two phases solves the problem of mutual coupling between pitch control and torque control, improving the power output efficiency of generator 2.

[0068] The pitch torque decoupling control method in this embodiment is applied to the main control unit 1 of the wind power generation system, such as... Figure 1 As shown, the wind power generation system also includes a wind turbine 3, a generator 2, a pitch control unit 4, and a torque control unit 5. The wind turbine 3 is equipped with multiple blades 31; the pitch control unit 4 is used to control the pitch of the blades 31, adjusting their pitch angle; the torque control unit 5 is used to control the output torque of the generator 2, adjusting its output torque.

[0069] The pitch torque decoupling control method of this embodiment will be described in detail below, such as... Figure 2 As shown, it includes steps 101, 102, 103a, and 103b;

[0070] Step 101: Obtain the current output power of generator 2.

[0071] The power detection module can monitor the output power of generator 2 in real time. The module then performs a first-order low-pass filter on the collected output power data to obtain data with anti-interference processing. After receiving the anti-interference processed output power data, the main control unit 1 can perform more accurate judgments and processing.

[0072] Step 102: Determine whether the output power has reached the rated power.

[0073] The rated power is generally the upper limit of the output power designed for generator 2. Assuming the detected output power is P1 and the rated power is P0, the main control unit 1 compares the magnitude of P0 and P1 to determine whether the output power has reached the rated power.

[0074] Step 103a: If not, send a first pitch control command to the pitch control unit 4 so that the pitch control unit 4 controls the blades 31 of the wind turbine 3 to maintain the minimum pitch angle, and send a first torque control command to the torque control unit 5 so that the torque control unit 5 increases the output torque of the generator 2.

[0075] Specifically, when the output power is determined to be less than the rated power, it is determined that the output power of generator 2 has not reached the rated power, and there is still room for the output power of generator 2 to increase. At this time, the main control unit 1 sends the first pitch control command to the pitch control unit 4. The pitch control unit 4 controls the blades 31 of the wind turbine 3 to maintain the minimum pitch angle and temporarily stops making adjustments in order to maintain the maximum wind energy capture capability of the wind turbine 3 and increase the output power of generator 2 as quickly as possible.

[0076] At the same time, the main control unit 1 sends a first torque control command to the torque control unit 5, so that the torque control unit 5 continuously increases the output torque of the generator 2 to improve the output power of the generator 2.

[0077] Thus, during the period before the generator 2's output power reaches its rated power, the pitch control unit 4 does not perform pitch control adjustments, maintaining the minimum pitch angle of the blade 31. At the same time, only the torque control unit 5 performs torque control on the generator 2's output torque. That is, pitch control and torque control are decoupled during this stage.

[0078] Step 103b: If yes, a second torque control command is sent to the torque control unit 5 to keep the output torque of the generator 2 at the rated torque, and a second pitch control command is sent to the pitch control unit 4 to adjust the pitch angle of the blade 31.

[0079] Specifically, when the output power is determined to be equal to the rated power, it is determined that the output power of generator 2 has reached the rated power and the output power of generator 2 has reached the set upper limit. At this time, the main control unit 1 sends a second torque control command to the torque control unit 5, so that the torque control unit 5 controls the output torque of generator 2 to maintain the rated torque, and the output torque of generator 2 is not adjusted temporarily.

[0080] At the same time, the main control unit 1 sends a second pitch control command to the pitch control unit 4 to adjust the pitch angle of the blade 31 in order to adjust the wind energy capture capability of the wind turbine 3, so that the output power of the generator 2 is maintained at the rated power, so as to ensure that the generator 2 can continuously output the maximum power and improve the power generation efficiency of the generator 2.

[0081] Thus, during this phase after the generator 2 has reached its rated output power, the torque control unit 5 does not adjust the torque control. Instead, only the pitch control unit 4 controls the pitch angle of the wind turbine 3 to adjust its wind energy capture capability, thereby maintaining the generator 2's output power at its rated power. In other words, this phase also achieves decoupling between pitch control and torque control.

[0082] Therefore, the pitch torque decoupling control method provided in this embodiment can fix the pitch control and adjust the torque control separately before the generator 2 reaches its rated power; and fix the torque control and adjust the pitch control separately after reaching the rated power. In this way, torque control and pitch control are decoupled in the two stages, solving the problem of mutual coupling between pitch control and torque control, and improving the power output efficiency of generator 2.

[0083] In one embodiment, before sending the first pitch control command to the pitch control unit 4 in step 103a, as follows: Figure 3 As shown, it also includes the following steps:

[0084] Step 201: Obtain the rotational speed of generator 2.

[0085] The rotational speed of generator 2 can be obtained through a speed detection module. After detecting the rotational speed of generator 2, the speed detection module performs a first-order low-pass filter on the speed data to obtain data with anti-interference processing. After receiving the output power data with anti-interference processing, the main control unit 1 can perform more accurate judgment and processing.

[0086] Step 202: Determine the operating stage of generator 2 based on the rotational speed of generator 2. The operating stage includes the start-up stage, the torque ramp-up stage, and the rated speed stage.

[0087] Specifically, the startup phase is the stage where the speed of generator 2 increases from 0 to the startup speed, which is the speed at which generator 2 is connected to the grid and begins to output power. When the speed of generator 2 has not reached the startup speed, the output torque of generator 2 is 0. When the speed of generator 2 reaches the startup speed and is maintained at the startup speed, the output torque of generator 2 begins to increase until it increases to the first torque threshold.

[0088] The torque ramp-up phase is the stage where the speed of generator 2 increases from the starting speed to the rated speed. Once the output torque of generator 2 at the starting speed reaches the first torque threshold, generator 2 enters the torque ramp-up phase. During this phase, both the speed and output torque of generator 2 begin to increase.

[0089] The rated speed stage is the operating phase in which generator 2 maintains its rated speed. Once generator 2 reaches its rated speed, it enters the rated speed stage. During this stage, generator 2 maintains its rated speed, and the output torque continues to increase until it reaches the second torque threshold.

[0090] Step 203: Determine the output torque of generator 2 based on the speed and operating stage of generator 2.

[0091] The relationship between the speed and output torque of generator 2 is different in the startup phase, torque ramp-up phase, and rated speed phase. Once it is determined which phase of the generator 2 is in, the output torque of generator 2 can be determined based on the speed.

[0092] Specifically, the above steps may include: determining a torque-speed interpolation table between the torque and the speed of generator 2 based on the operating stage; and determining the output torque based on the speed of generator 2 and the torque-speed interpolation table.

[0093] The torque-speed interpolation table records multiple correspondences between torque and speed, allowing the corresponding torque value to be obtained from the speed. The torque-speed interpolation tables differ for each of the startup, torque ramp-up, and rated speed stages. Therefore, once the operating stage of generator 2 is determined, the corresponding torque-speed interpolation table can be selected. This eliminates complex calculations and improves data processing efficiency and accuracy.

[0094] The torque-speed interpolation tables for each stage can be obtained by acquiring a large amount of data through prior experiments, and then integrating this data into torque-speed interpolation tables.

[0095] Step 204: Generate a first torque control command based on the output torque.

[0096] The first torque control command contains output torque information. Based on the output torque information in the first control command, the torque control unit 5 can control the output torque of the generator 2 to the corresponding value, thereby achieving precise control of the output torque of the generator 2.

[0097] In one embodiment, step 203 may specifically include the following steps:

[0098] First, during the startup phase, when the speed of generator 2 reaches the startup speed, it is determined that the output torque will continue to increase, and the speed of generator 2 will be maintained at the startup speed.

[0099] Specifically, before the generator 2 reaches the starting speed, the output torque is 0. After the speed reaches the starting speed, the output torque begins to increase continuously, and the output power of the generator 2 also begins to increase continuously during this stage.

[0100] Then, when the output torque increases to the first torque threshold, the torque ramp-up phase begins; during the torque ramp-up phase, the speed and output torque of generator 2 both begin to increase until the speed of generator 2 reaches the rated speed.

[0101] Specifically, generator 2 maintains a constant starting speed, and the output torque begins to increase. When the output torque reaches the first torque threshold, it enters the torque ramp-up stage. Then, both the speed and torque begin to increase until the speed increases to the rated speed. During this stage, the output power of generator 2 also begins to increase continuously.

[0102] Then, when the speed of generator 2 reaches the rated speed, it enters the rated speed stage, keeping the speed of generator 2 at the rated speed; and determines that the output torque continues to increase until the output torque increases to the second torque threshold.

[0103] Specifically, at rated speed, generator 2 continuously increases output torque, and output power also continuously increases. When the output torque increases to the second threshold, the output power also reaches the rated power.

[0104] In one embodiment, before the step of sending the second pitch control command to the pitch control unit 4 in step 103b, as follows: Figure 4 As shown, it also includes the following steps:

[0105] Step 301: Obtain wind speed information.

[0106] Specifically, an anemometer can be used to detect wind speed in the environment. After detecting the wind speed, the anemometer performs a first-order low-pass filter on the wind speed data to obtain interference-resistant data. After receiving the interference-resistant wind speed information, the main control unit 1 can perform more accurate judgments and processing.

[0107] The above steps may also include: receiving wind speed information from a wind speed prediction model, which is used to predict wind speed information for a future period based on wind speed information over a past period and current weather conditions.

[0108] The wind speed prediction model is used to predict wind speed information for a period of time in the future. The main control unit 1 sends the predicted wind speed information to the pitch control unit 4, allowing the blades 31 to change their pitch angle in advance. This avoids the lag in pitch control and prevents large fluctuations in the output power of generator 2 caused by untimely changes in pitch angle when wind speed changes suddenly.

[0109] Step 302: Determine the pitch angle based on the wind speed information and rated power.

[0110] Wind speed determines the amount of wind energy that can be captured. When the wind speed is too high, the pitch angle of the blades 31 needs to be increased through the pitch control unit 4 to reduce the wind energy capture capacity of the rotor 3, so that the generator 2 can maintain its rated power without changing its output torque. In this case, the speed of the generator 2 will decrease accordingly. When the wind speed is too low, the pitch angle of the blades 31 needs to be decreased through the pitch control unit 4 to increase the wind energy capture capacity of the rotor 3, so that the generator 2 can maintain its rated power without changing its output torque. In this case, the speed of the generator 2 will increase accordingly.

[0111] The above steps may also include: calling up the correspondence table of wind speed, rated power, and pitch angle; and determining the pitch angle based on the correspondence table of wind speed, rated power, and pitch angle.

[0112] The table showing the correspondence between wind speed, rated power, and pitch angle can be generated by acquiring a large amount of data through prior experiments. The corresponding relationship between wind speed, rated power, and pitch angle can then be determined from the table using wind speed and rated power. This eliminates complex calculations and improves data processing efficiency.

[0113] Step 303: Generate a second pitch control command based on the pitch angle.

[0114] The second pitch control command includes pitch angle information. The pitch control unit 4 adjusts the blade 31 to the corresponding pitch angle according to the pitch angle information in the second pitch control command, so as to adjust the wind energy capture capability of the wind turbine 3 and realize precise control of the pitch angle.

[0115] The pitch torque decoupling control method provided in this embodiment of the invention can divide the operation of generator 2 into two phases: before reaching rated power and after reaching rated power. The wind turbine 3 or generator 2 is controlled in both phases. Before generator 2 reaches rated power, pitch control is fixed, while torque control is adjusted separately. After reaching rated power, torque control is fixed, while pitch control is adjusted separately. This decoupling of torque control and pitch control in the two phases solves the problem of mutual coupling between pitch control and torque control, thereby improving the power output efficiency of generator 2.

[0116] This invention provides a wind power generation system, including a main control unit 1, a wind turbine 3, a generator 2, a pitch control unit 4, and a torque control unit 5. For example... Figure 5 As shown, the main control unit 1 includes an acquisition module 11, a judgment module 12, a first instruction module 13, and a second instruction module 14, wherein:

[0117] Module 11 is used to obtain the current output power of generator 2;

[0118] The judgment module 12 is used to determine whether the output power reaches the rated power;

[0119] The first instruction module 13 is used to send a first pitch control instruction to the pitch control unit 4 when the output power does not reach the rated power, so that the pitch control unit 4 adjusts the blades 31 of the wind turbine 3 to maintain the minimum pitch angle, and sends a first torque control instruction to the torque control unit 5, so that the torque control unit 5 increases the output torque of the generator 2.

[0120] The second instruction module 14 is used to send a second torque control instruction to the torque control unit 5 when the output power reaches the rated power, so that the torque control unit 5 controls the output torque of the generator 2 to maintain the rated torque, and sends a second pitch control instruction to the pitch control unit 4 to adjust the pitch angle of the blade 31.

[0121] In this embodiment, the main control unit 1 of the wind power generation system applies the pitch torque decoupling control method provided in the above embodiment. This allows the generator 2's operation to be divided into two phases: before reaching rated power and after reaching rated power. The wind turbine 3 or generator 2 is controlled in both phases. Before the generator 2 reaches rated power, pitch control is fixed, while torque control is adjusted separately. After reaching rated power, torque control is fixed, while pitch control is adjusted separately. This decoupling of torque control and pitch control in both phases solves the problem of mutual coupling between pitch control and torque control, improving the power output efficiency of the generator 2.

[0122] In this embodiment of the invention, the main control unit 1 can be an electronic device with a computer system. Figure 6 A schematic diagram of a computer system suitable for implementing embodiments of the present invention is shown.

[0123] It should be noted that, Figure 6 The computer system of the electronic device shown is merely an example and should not impose any limitation on the functionality and scope of use of the embodiments of the present invention.

[0124] like Figure 6As shown, the computer system includes a Central Processing Unit (CPU) 1801, which can perform various appropriate actions and processes based on programs stored in Read-Only Memory (ROM) 1802 or programs loaded from storage portion 1808 into Random Access Memory (RAM) 1803, such as performing the methods described in the above embodiments. Various programs and data required for system operation are also stored in RAM 1803. The CPU 1801, ROM 1802, and RAM 1803 are interconnected via bus 1804. An Input / Output (I / O) interface 1805 is also connected to bus 1804.

[0125] The following components are connected to I / O interface 1805: an input section 1806 including a keyboard, mouse, etc.; an output section 1807 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and speakers, etc.; a storage section 1808 including a hard disk, etc.; and a communication section 1809 including a network interface card such as a LAN (Local Area Network) card, modem, etc. The communication section 1809 performs communication processing via a network such as the Internet. A drive 1810 is also connected to I / O interface 1805 as needed. Removable media 1811, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., are installed on drive 1810 as needed so that computer programs read from them can be installed into storage section 1808 as needed.

[0126] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing computer programs for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via communication section 1809, and / or installed from removable medium 1811. When the computer program is executed by central processing unit (CPU) 1801, it performs various functions defined in the system of the present invention.

[0127] It should be noted that the computer-readable medium shown in the embodiments of the present invention can be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. A computer-readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of a computer-readable storage medium may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), flash memory, optical fiber, portable compact disc read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof. In the present invention, a computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. In the present invention, a computer-readable signal medium can include a data signal propagated in baseband or as part of a carrier wave, wherein a computer-readable computer program is carried. The transmitted data signal can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. The computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The computer program contained on the computer-readable medium can be transmitted using any suitable medium, including but not limited to wireless, wired, etc., or any suitable combination thereof.

[0128] 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. Each block in a flowchart or block diagram may represent a module, segment, or portion of code, which contains 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 a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, may 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.

[0129] The units described in the embodiments of the present invention can be implemented in software or hardware, and the described units can also be located in a processor. The names of these units do not necessarily limit the specific unit itself.

[0130] In another aspect, the present invention also provides a computer-readable storage medium, which may be included in the electronic device described in the above embodiments; or it may exist independently and not assembled into the electronic device. The storage medium carries one or more computer programs that, when executed by a processor of the electronic device, cause the electronic device to implement the methods provided in the above embodiments.

[0131] It should be noted that although several modules or units of the device for performing actions have been mentioned in the detailed description above, this division is not mandatory. In fact, according to embodiments of the present invention, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units.

[0132] Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of the present invention can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, portable hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, host server, touch terminal, or network device, etc.) to execute the method according to the embodiments of the present invention.

[0133] In this embodiment, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the above description to give a full understanding of the embodiments of the invention. However, those skilled in the art will recognize that the technical solutions of the invention can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of the invention.

[0134] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0135] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0136] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein.

[0137] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A method of variable pitch torque decoupling control, the method comprising: The application discloses a main control unit applied to a wind power generation system, and relates to the technical field of wind power generation. Obtaining the current output power of the generator; Determining whether the output power reaches the rated power; If not, sending a first pitch control instruction to the pitch control unit to control the blade pitch of the wind wheel to keep the minimum pitch angle, and sending a first torque control instruction to the torque control unit to increase the output torque of the generator; If yes, sending a second torque control instruction to the torque control unit to control the output torque of the generator to keep the rated torque, and sending a second pitch control instruction to the pitch control unit to adjust the pitch angle of the blade pitch. Before the step of sending the first torque control instruction to the torque control unit, the method further comprises the steps that: Obtaining the rotating speed of the generator; Determining the operating stage of the generator according to the rotating speed of the generator, wherein the operating stage comprises a starting stage, a torque climbing stage and a rated rotating speed stage; According to the rotating speed of the generator and the operating stage, the output torque of the generator is determined, and specifically, in the starting stage, when the rotating speed of the generator reaches the starting rotating speed, the output torque is determined to be continuously increased, and the rotating speed of the generator is maintained at the starting rotating speed; When the output torque increases to a first torque threshold, the torque climbing stage is entered; In the torque climbing stage, the rotating speed of the generator and the output torque are both started to increase until the rotating speed of the generator reaches the rated rotating speed; When the rotating speed of the generator reaches the rated rotating speed, the rated rotating speed stage is entered, and the rotating speed of the generator is maintained at the rated rotating speed; The output torque is determined to be continuously increased until the output torque increases to a second torque threshold; According to the output torque, a first torque control instruction is generated.

2. The method of pitch torque decoupling control of claim 1, wherein, The step of determining the output torque of the generator according to the rotating speed of the generator and the operating stage comprises the steps that: According to the operating stage, a torque-rotating speed interpolation table of the torque and the rotating speed of the generator is determined; According to the rotating speed of the generator and the torque-rotating speed interpolation table, the output torque is determined.

3. The pitch torque decoupling control method according to any one of claims 1 to 2, characterized in that, Before the step of sending the second pitch control instruction to the pitch control unit, the method further comprises the steps that: Obtaining wind speed information; According to the wind speed information and the rated power, the pitch angle is determined; According to the pitch angle, a second pitch control instruction is generated.

4. The method of pitch torque decoupling control of claim 3, wherein, The step of determining the pitch angle according to the wind speed information and the rated power comprises the steps that: A corresponding relation table of wind speed, rated power and pitch angle is called; According to the wind speed, the rated power and the corresponding relation table, the pitch angle is determined.

5. The method of pitch torque decoupling control of claim 3, wherein, The step of obtaining wind speed information comprises the steps that: Wind speed information sent by a wind speed prediction model is received, and the wind speed prediction model is used for predicting wind speed information in a future period of time according to wind speed information in a past period of time and current weather conditions.

6. A wind power system characterized by The application is applied to the variable pitch torque decoupling control method in any one of claims 1-5, comprising a master control unit, a wind wheel, a generator, a variable pitch control unit and a torque control unit, and the master control unit comprises: an acquisition module, configured to acquire the current output power of the generator; a judgment module, configured to judge whether the output power reaches the rated power; a first instruction module, configured to send a first variable pitch control instruction to the variable pitch control unit to make the variable pitch control unit adjust the blade pitch of the wind wheel to keep the minimum pitch angle, and send a first torque control instruction to the torque control unit to make the torque control unit increase the output torque of the generator, when the output power does not reach the rated power; a second instruction module, configured to send a second torque control instruction to the torque control unit to make the torque control unit control the output torque of the generator to keep the rated torque, and send a second variable pitch control instruction to the variable pitch control unit to adjust the pitch angle of the blade pitch, when the output power reaches the rated power.

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