Method, device, controller and medium for controlling a wind turbine generator system

Abstract

The application discloses a kind of wind generating set control method, device, controller and medium, belong to wind power generation field.The method comprises: obtaining the torque data and current speed of wind generating set;In the case where current speed is located in the first speed interval, target control parameter is determined based on current speed, preset first target corresponding relationship and the trend of torque obtained based on torque data, wherein target control parameter includes target torque, or, including target torque and target speed, the speed of first speed interval is greater than or equal to rated speed and less than or equal to extension speed, and the torque in first target corresponding relationship in first speed interval is greater than or equal to the first torque corresponding to rated speed;The control parameter of wind generating set is adjusted to target control parameter.According to the embodiment of the application, the power generation of wind generating set can be improved.

Description

Technical Field

[0001] This application belongs to the field of wind power generation, and in particular relates to a control method, device, controller and medium for a wind turbine generator set. Background Technology

[0002] A wind turbine is a device that converts wind energy into electrical energy. During operation, the wind turbine is controlled according to a speed-torque curve. The speed-torque curve represents the relationship between the wind turbine's speed and torque. By adjusting the wind turbine's speed and torque to match the curve, control of the wind turbine can be achieved.

[0003] However, at present, the control of wind turbine operation limits the performance of the blades, making it difficult to increase the power generation of wind turbines. Summary of the Invention

[0004] This application provides a control method, device, controller, and medium for wind turbine generator sets, which can improve the power generation of wind turbine generator sets.

[0005] In a first aspect, embodiments of this application provide a control method for a wind turbine generator set, comprising: acquiring torque data and current rotational speed of the wind turbine generator set; when the current rotational speed is within a first rotational speed range, determining target control parameters based on the current rotational speed, a preset first target correspondence, and a torque trend obtained based on the torque data, wherein the target control parameters include target torque, or include target torque and target rotational speed, wherein the rotational speed in the first rotational speed range is greater than or equal to the rated rotational speed and less than or equal to the extended rotational speed, and the torque in the first rotational speed range in the first target correspondence is greater than or equal to the first torque corresponding to the rated rotational speed; and adjusting the control parameters of the wind turbine generator set to the target control parameters.

[0006] Secondly, embodiments of this application provide a control device for a wind turbine generator set, comprising: an acquisition module for acquiring the current rotational speed of the wind turbine generator set; a torque determination module for determining target control parameters based on the current rotational speed, a preset first target correspondence, and a torque trend obtained from torque data when the current rotational speed is within a first rotational speed range, wherein the target control parameters include a target torque, or include a target torque and a target rotational speed, wherein the rotational speed in the first rotational speed range is greater than or equal to the rated rotational speed and less than or equal to the extended rotational speed, and the torque in the first rotational speed range in the first target correspondence is greater than or equal to the first torque corresponding to the rated rotational speed; and a control module for controlling the control parameters of the wind turbine generator set to adjust to the target control parameters.

[0007] Thirdly, embodiments of this application provide a controller, including: a processor and a memory storing computer program instructions; the processor executes the computer program instructions to implement the control method of the wind turbine generator set of the first aspect.

[0008] Fourthly, embodiments of this application provide a computer-readable storage medium storing computer program instructions, which, when executed by a processor, implement the wind turbine generator control method of the first aspect.

[0009] This application provides a control method, device, controller, and medium for a wind turbine generator set. When the current speed of the wind turbine generator set is within a first speed range, target control parameters are determined based on the current speed, the torque data of the wind turbine generator set, and a preset first target correspondence. The control parameters of the wind turbine generator set are then adjusted to the target control parameters. The target control parameters include target torque, or target torque and target speed. The speed in the first speed range is greater than or equal to the rated speed and less than or equal to the extended speed. In the first target correspondence, the torque within the first speed range is greater than or equal to the first torque corresponding to the rated speed. The wind turbine generator set adjusts the target control parameters according to the first target correspondence. After reaching the rated speed, the speed of the wind turbine generator set can continue to increase. When the speed is greater than the rated speed, the torque still changes with the speed and is greater than the first torque, thus extending the variable speed segment in the speed-torque curve of the wind turbine generator set. The blade performance is better in the variable speed segment compared to other conditions. The extension of the variable speed segment expands the operating range of the blades, thereby increasing the power generation of the wind turbine generator set. Attached Figure Description

[0010] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0011] Figure 1 A flowchart illustrating a control method for a wind turbine generator set provided in an embodiment of this application;

[0012] Figure 2 This is a schematic diagram illustrating an example of a speed-torque curve in an embodiment of this application;

[0013] Figure 3 A flowchart of a control method for a wind turbine generator set provided in another embodiment of this application;

[0014] Figure 4 A flowchart of a control method for a wind turbine generator set provided in yet another embodiment of this application;

[0015] Figure 5 A flowchart illustrating a control method for a wind turbine generator set provided in yet another embodiment of this application;

[0016] Figure 6 One of the comparative schematic diagrams of control scheme 1, control scheme 2 and control scheme 3 provided in the embodiments of this application;

[0017] Figure 7 A second comparative schematic diagram of control scheme one, control scheme two, and control scheme three provided in the embodiments of this application;

[0018] Figure 8 The third comparative schematic diagram of control scheme 1, control scheme 2 and control scheme 3 provided in the embodiments of this application;

[0019] Figure 9 A schematic diagram of the structure of a control device for a wind turbine generator set provided in an embodiment of this application;

[0020] Figure 10 This is a schematic diagram of the controller provided in one embodiment of this application. Detailed Implementation

[0021] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0022] A wind turbine is a device that converts wind energy into electrical energy. During operation, the wind turbine's operation is controlled according to a speed-torque curve. This speed-torque curve essentially represents the relationship between the wind turbine's rotational speed and torque; it can be represented as a curve, a table, or other forms, which are not limited here. The wind turbine's speed and torque can be adjusted to correspond to the values ​​shown on the speed-torque curve, thus achieving control. However, the control of wind turbine operation imposes limitations on blade performance, making it difficult to increase the power generation of the wind turbine.

[0023] This application provides a control method, device, controller, and medium for a wind turbine generator set. It can control the wind turbine generator set's speed to continue increasing after reaching the rated speed, and when the wind turbine generator set's speed is higher than the rated speed, it controls the torque of the wind turbine generator set to increase relative to the torque when the speed is less than or equal to the rated speed, thereby extending the variable speed segment of the wind turbine generator set's speed-torque curve. The variable speed segment is the section of the speed-torque curve where the wind turbine generator set's torque changes with the speed. During the variable speed segment, the blade performance is better compared to other conditions, resulting in increased power generation. Extending the variable speed segment of the wind turbine generator set's speed-torque curve expands the range of optimal blade performance, thereby increasing the wind turbine generator set's power generation.

[0024] The first aspect of this application provides a control method for a wind turbine generator set, which can be applied to wind turbine generator set control scenarios. This control method can be executed by a control device, which can be a controller for the wind turbine generator set or other devices with control functions, and is not limited thereto. Figure 1 A flowchart of a control method for a wind turbine generator set provided in an embodiment of this application is shown below. Figure 1 As shown, the control method for the wind turbine generator set may include steps S101 to S103.

[0025] In step S101, the torque data and current speed of the wind turbine generator set are obtained.

[0026] The system can periodically acquire torque data and current speed of the wind turbine generator set. The period for acquiring torque data can differ from the period for acquiring current speed, and this is not limited here. The periods for acquiring torque data and current speed can be set according to scenarios, requirements, experience, etc., and are not limited here. Alternatively, upon receiving a control command, the system can trigger the acquisition of torque data and current speed of the wind turbine generator set in response to the control command. The above-mentioned methods of periodically acquiring torque data and current speed of the wind turbine generator set and methods of acquiring torque data and current speed of the wind turbine generator set in response to control commands can be used in combination, and are not limited here.

[0027] Torque data is data related to the torque of the wind turbine generator set. For example, torque data may include the target torque for controlling the wind turbine generator set.

[0028] In step S102, when the current speed is within the first speed range, the target control parameters are determined based on the current speed, the preset first target correspondence, and the torque trend obtained based on the torque data.

[0029] The first speed range is defined as the speed within which the rated speed is greater than or equal to the rated speed and less than or equal to the extended speed. In other words, the first speed range is the range where the speed is greater than or equal to the rated speed and less than or equal to the extended speed; that is, the first speed range is [rated speed, extended speed]. The rated speed is the speed at which the wind turbine generator operates at its rated power and connected to the grid. The extended speed is greater than the rated speed and less than or equal to the maximum safe operating speed of the wind turbine generator. The specific value of the extended speed can be set according to the model, structure, application environment, and application requirements of the wind turbine generator, and is not limited here. In some examples, the ratio of the extended speed to the rated speed is greater than or equal to 1 and less than or equal to 1.3, i.e., Ω. r ≤Ω e ≤1.3Ω r , where Ω r For the rated speed, Ω e To extend the rotational speed.

[0030] The first target correspondence includes the correspondence between speed and torque within a first speed range. In this first target correspondence, the torque within the first speed range is greater than or equal to the first torque corresponding to the rated speed. The first torque is the torque corresponding to the rated speed on the speed-torque curve. In the first target correspondence, the torque corresponding to all speeds within the first speed range other than the rated speed is greater than the first torque.

[0031] The torque trend is the change of torque over time and can be obtained based on torque data. For example, the torque of a wind turbine generator at time t1 is M1, and the torque of the wind turbine generator at time t2 is M2. Time t1 is earlier than time t2. If torque M2 is greater than torque M1, then the torque trend is increasing; if torque M2 is less than torque M1, then the torque trend is decreasing.

[0032] In the first target correspondence, within the first speed range, the torque can first increase with the increase of speed. When the torque reaches a certain torque, the torque will continue to increase with the decrease of speed until the speed returns to the rated speed, and the torque increases to the rated torque and remains at the rated torque.

[0033] To make it easier to understand, the first target correspondence will be illustrated below using the speed-torque curve. Figure 2 This is a schematic diagram of an example of a speed-torque curve in an embodiment of this application. Figure 2 The middle is located at the rated speed Ω r Up to extended speed Ω e The curved portion of the interval represents the correspondence of the first target, and the curved portion corresponding to the correspondence of the first target may include segments C, D, and E. In segment C, the torque increases with increasing speed, and the maximum torque value is M. d The minimum torque is M cIn segment DE, torque decreases as speed increases, with the maximum torque value being M. e The minimum torque is M d In some cases, the curve corresponding to the first target relationship may also include segment EF, in which the rotational speed remains constant while the torque increases until the torque reaches the rated torque M. f .

[0034] The target control parameters are desired control parameters that can be used to control the operation of the wind turbine generator set. The target control parameters may include target torque, or they may include both target torque and target speed. Based on the torque trend, a correspondence applicable to the current situation within the first target correspondence can be determined. From this correspondence applicable to the current situation, the target torque, or target speed and target torque, can be obtained. The target speed may be the desired value of the wind turbine generator set's speed, and the target torque may be the desired value of the wind turbine generator set's torque.

[0035] In step S103, the control parameters of the wind turbine generator set are adjusted to the target control parameters.

[0036] The wind turbine generator set is controlled by adjusting its control parameters to target control parameters, which can be done gradually. Based on the torque trend, the torque of the wind turbine generator set can be adjusted, or the speed and torque of the wind turbine generator set can be adjusted, so that the wind turbine generator set operates according to the first target relationship when the speed is within a first speed range.

[0037] In some examples, the target control parameter includes a target torque, which can be adjusted by regulating the operating parameters of the generator in the wind turbine to adjust the torque of the wind turbine to the target torque. Operating parameters can be electrical parameters; for example, operating parameters may include, but are not limited to, current.

[0038] In this embodiment, when the current speed of the wind turbine generator is within a first speed range, target control parameters are determined based on the current speed, the torque data of the wind turbine generator, and a preset first target correspondence. The control parameters of the wind turbine generator are then adjusted to the target control parameters. The target control parameters include target torque, or target torque and target speed. The speed in the first speed range is greater than or equal to the rated speed and less than or equal to the extended speed. In the first target correspondence, the torque within the first speed range is greater than or equal to the first torque corresponding to the rated speed. The wind turbine generator adjusts the target control parameters according to the first target correspondence. After reaching the rated speed, the speed of the wind turbine generator can continue to increase. When the speed is greater than the rated speed, the torque still changes with the speed and is greater than the first torque, thus extending the variable speed segment in the wind turbine generator's speed-torque curve. The blade performance is better in the variable speed segment compared to other conditions. The extension of the variable speed segment expands the operating range for optimal blade performance, thereby increasing the power generation of the wind turbine generator.

[0039] In some embodiments, the first target correspondence may include a first sub-correspondence, wherein the rotational speed and torque within a first rotational speed range are positively correlated, that is, the torque increases with increasing rotational speed within the first rotational speed range. The torque data may include the target torque prior to a predetermined period, and the target control parameters include the target torque. For example, the first sub-correspondence may be as follows: Figure 2 As shown in segment CD. Figure 3 A flowchart of a control method for a wind turbine generator set provided in another embodiment of this application. Figure 3 and Figure 1 The difference is that, Figure 1 Step S102 can be further refined as follows: Figure 3 Steps S1021 and S1022 in the process, Figure 1 Step S103 can be further refined as follows: Figure 3 Step S1031 in the process.

[0040] In step S1021, if the current speed is in the first speed range and the target torque before the predetermined period is less than or equal to the second torque, the trend of torque is determined to be an increasing trend, and the first sub-correspondence is determined as the first target correspondence.

[0041] The predetermined period can be a time interval, specifically the period during which the current rotational speed of the wind turbine is acquired. The duration of this interval must meet the interval accuracy requirement for the wind turbine control to acquire the current rotational speed; that is, the current rotational speed of the wind turbine is acquired once within each predetermined period. The predetermined period can be a fixed value or a variable value, automatically adjusted according to the operational needs of the wind turbine, or adjusted according to received adjustment commands; there is no limitation here. For example, within a given period, the first predetermined period might be 10 seconds long, and in response to an adjustment command, the duration of the second predetermined period could be adjusted to 30 seconds.

[0042] The target torque before the predetermined period is the target torque obtained based on the current speed obtained last time, that is, the target torque determined last time.

[0043] The second torque is the torque corresponding to the extended speed in the first sub-correspondence. In the first sub-correspondence, the speed and torque within the first speed range are positively correlated; correspondingly, the second torque is the maximum torque among the torques corresponding to each speed within the first speed range in the first sub-correspondence. For example, Figure 2 M in d This is the second torque. The second torque can be preset. It is greater than the first torque but less than the rated torque. The specific setting depends on the wind turbine model, structure, application environment, and application requirements, and is not limited here. In some examples, the ratio of the second torque to the rated torque is greater than or equal to 0.5 and less than or equal to 0.7, i.e., 0.5M. f ≤M d ≤0.7M f , of which M d For the second torque, M f This refers to the rated torque. For example, the ratio of the second torque to the rated torque is 0.6, i.e., M. d =0.6M f .

[0044] The target torque prior to the predetermined period is the torque determined and adjusted during the previous torque control process. The target torque prior to the predetermined period falls between the first and second torques. The torque trend between the first and second torques shows an increasing trend, indicating that the torque should be adjusted according to the first sub-correspondence between the first and second torques. This first sub-correspondence can be used as the first target correspondence. The torque corresponding to the current speed in the first sub-correspondence is determined as the target torque for the wind turbine generator's torque adjustment.

[0045] In step S1022, the torque corresponding to the current rotational speed in the first sub-correspondence is determined as the target torque.

[0046] exist Figure 2 In the diagram, the variable speed segment of the wind turbine generator is segment BCDE, and the first sub-correspondence is as follows: Figure 2 As shown in section CD, section CD is an extended variable speed section. The variable speed section is extended from section BC to section BCD. Compared with section BC, it can further improve the power generation of wind turbine generators.

[0047] In some embodiments, the relationship between the speed and torque of the wind turbine generator set may further include a second target correspondence. The second target correspondence includes the correspondence between the speed and torque within a second speed range. The speed within the second speed range is greater than or equal to the cut-in speed and less than or equal to the rated speed. In other words, the second speed range is a speed range in which the speed is greater than or equal to the cut-in speed and less than or equal to the rated speed, i.e., the second speed range is [cut-in speed, rated speed].

[0048] The second target correspondence smoothly connects with the first sub-correspondence, and the torque corresponding to the rated speed in the first sub-correspondence is the same as the torque corresponding to the rated speed within the second speed range in the second target correspondence. Furthermore, the torque D and speed Ω in the first sub-correspondence and the second target correspondence satisfy the following equation (1):

[0049] k×Ω 2 =D (1)

[0050] Where k is the optimal gain constant coefficient, which can be set according to the model, structure, application environment and application requirements of the wind turbine generator set, and is not limited here.

[0051] In step S1031, the torque of the wind turbine generator set is adjusted to the target torque.

[0052] The adjustment here refers to adjusting from the current torque to the target torque. This adjustment can be gradual, and can be gradually adjusted to the target torque over a period of time.

[0053] In some embodiments, the first target correspondence may include a second sub-correspondence, in which the rotational speed and torque within a first rotational speed range are negatively correlated; that is, the torque decreases as the rotational speed increases within the first rotational speed range. The torque data may include the target torque prior to a predetermined period, and the target control parameters include the target rotational speed and the target torque. For example, the first sub-correspondence may be as follows: Figure 2 As shown in section DE. Figure 4 A flowchart of a control method for a wind turbine generator set provided in another embodiment of this application. Figure 4 and Figure 1 The difference is that, Figure 1 Step S102 can be further refined as follows: Figure 4 Steps S1023 to S1024 in the process, Figure 1 Step S103 can be further refined as follows: Figure 4 Step S1032 in the process.

[0054] In step S1023, if the current speed is in the first speed range and the target torque before the predetermined period is greater than the second torque, the trend of torque is determined to be a decreasing trend, and the second sub-correspondence is determined as the first target correspondence.

[0055] The second torque is the torque corresponding to the extended speed in the second sub-correspondence. In the second sub-correspondence, the speed and torque within the first speed range are negatively correlated; correspondingly, the second torque is the minimum torque among the torques corresponding to each speed within the first speed range in the second sub-correspondence. In some examples, the torque corresponding to the extended speed in the second sub-correspondence is the same as the torque corresponding to the extended speed in the first sub-correspondence. For details regarding the second torque, please refer to the relevant descriptions in the above embodiments, which will not be repeated here.

[0056] The target torque prior to the predetermined period is the torque determined and adjusted during the previous torque control process. If the target torque prior to the predetermined period is greater than the second torque, and the torque trend is decreasing, it indicates that the torque should be adjusted according to the second sub-correspondence relationship corresponding to the range greater than the second torque. This second sub-correspondence relationship can be used as the first target correspondence relationship. The speed corresponding to the target torque prior to the predetermined period in the second sub-correspondence relationship is determined as the target speed for adjusting the wind turbine generator's speed, i.e., the target speed. Similarly, the torque corresponding to the target speed in the second sub-correspondence relationship is determined as the target torque for adjusting the wind turbine generator's torque, i.e., the target torque.

[0057] In some examples, the torque of the wind turbine can be adjusted specifically based on a comparison between the target speed and the current speed. If the current speed is greater than the target speed, the torque is increased in the direction of the target torque. If the current speed is less than the target speed, the torque is decreased in the direction of the target torque. For example, proportional-integral-derivative (PID) control can be used to adjust the torque of the wind turbine using the current speed and the target speed.

[0058] In step S1024, the rotational speed corresponding to the target torque before the predetermined period in the second sub-correspondence is determined as the target rotational speed, and the torque corresponding to the target rotational speed in the second sub-correspondence is determined as the target torque.

[0059] exist Figure 2 In the diagram, the variable speed section of the wind turbine generator is segment BCDE, and the second sub-correspondence is as follows: Figure 2 As shown in section DE, the DE end is an extended variable speed section, which is extended from section BC to section BCDE. Compared with section BC, this can further increase the power generation of the wind turbine generator. Moreover, in the second sub-correspondence as follows... Figure 2In segment DE, as the rotational speed decreases, the torque continues to increase. In other words, the torque increases, but the rotational speed decreases, eventually returning to the rated speed Ω. r This can prevent the load on the wind turbine generator set from becoming too large, thus balancing the power generation and load of the wind turbine generator set.

[0060] In step S1032, the rotational speed of the wind turbine generator set is adjusted to the target rotational speed, and the torque of the wind turbine generator set is adjusted to the target torque.

[0061] Here, speed adjustment refers to adjusting from the current speed to the target speed, and torque adjustment refers to adjusting from the current torque to the target torque. Both speed and torque adjustments can be gradual, taking time to reach the target speed and torque. The time required to reach the target speed may differ from the time required to reach the target torque, and this is not limited here.

[0062] In some embodiments, after the speed drops from the extended speed back to the rated speed, the rated speed can be maintained, and the torque of the wind turbine generator can be increased until the torque reaches the rated speed. Figure 5 A flowchart of a control method for a wind turbine generator set provided in another embodiment of this application. Figure 5 and Figure 4 The difference is that, Figure 5 The control method for the wind turbine generator set shown may also include step S104.

[0063] In step S104, if the target torque before the predetermined period is greater than or equal to the third torque but less than the rated torque, the speed of the wind turbine generator set is controlled to remain at the rated speed, and the torque of the wind turbine generator set is increased until the torque of the wind turbine generator set reaches the rated torque.

[0064] The third torque is the torque corresponding to the rated speed in the second sub-correspondence. In the first speed range of the second sub-correspondence, speed and torque are negatively correlated; correspondingly, the third torque is the maximum torque among the torques corresponding to each speed in the first speed range of the second sub-correspondence. The third torque is greater than the second torque and less than or equal to the rated torque. The closer the third torque is to the rated torque, the greater the load on the wind turbine generator set, the higher the cost, and the greater the power generation; the closer the third torque is to the second torque, the smaller the load on the wind turbine generator set, the lower the cost, and the smaller the power generation. The third torque can be set according to the model, structure, application environment, and application requirements of the wind turbine generator set, and is not limited here. In some examples, the third torque is related to the maximum expected load and maximum expected power generation of the wind turbine generator set, and the third torque can be set according to specific circumstances. In some examples, the ratio of the third torque to the rated torque is greater than or equal to 0.8 and less than or equal to 1, i.e., 0.8M. f ≤M e ≤Mf , of which M e For the third torque, M f This refers to the rated torque. For example, the ratio of the third torque to the rated torque is 0.9, i.e., M. e =0.9M f .

[0065] To avoid overloading the wind turbine and ensure a certain power generation, after the speed drops from the extended speed to the rated speed, the rated speed can be maintained, and the torque of the wind turbine can be increased until the rated torque is reached. Once the rated torque is reached, the wind turbine can be controlled to operate at the rated speed and rated torque. If the target torque before the predetermined period is greater than or equal to the third torque but less than the rated torque, it means that the wind turbine speed should be maintained at the rated speed, and the wind turbine torque should be increased to the rated torque. After the wind turbine torque is increased to the rated torque, the wind turbine can be controlled to operate at the rated torque. For example, if... Figure 2 As shown, the relationship curve between speed and torque in step S104 is segment EF, and the rated torque is M. f The third torque is M e .

[0066] To more intuitively illustrate the advantages of the wind turbine generator control method in the embodiments of this application, the following comparison is made using control scheme one (wind turbine generator constant speed of 7.2 rpm), control scheme two (wind turbine generator constant speed of 7.92 rpm), and the wind turbine generator control method in the embodiments of this application (referred to as control scheme three). Figure 6 This is one of the comparative schematic diagrams of control scheme 1, control scheme 2 and control scheme 3 provided in the embodiments of this application. The horizontal axis represents time and the vertical axis represents rotational speed. Figure 7 This is the second comparative schematic diagram of control scheme one, control scheme two and control scheme three provided in the embodiments of this application. The horizontal axis represents time and the vertical axis represents load. Figure 8 The third diagram is a comparison of control scheme one, control scheme two, and control scheme three provided in the embodiments of this application. The horizontal axis represents time, and the vertical axis represents power. Figure 6 , Figure 7 and Figure 8 This is a comparative diagram obtained from tests conducted under the same conditions. Figure 6 Therefore, under the same rated power and wind speed, the speed of the wind turbine generator in control scheme three falls between the speeds of the wind turbine generators in control scheme one and control scheme two. This means that control scheme three employs dynamic speed control. Figure 7 It can be obtained that, with Figure 6Corresponding to the rotational speed, the maximum load in control scheme three is less than the maximum load in control scheme two. Figure 8 It can be obtained that, with Figure 6 The power ratio in control scheme three corresponds to the rotational speed in control scheme one, and falls between the power ratios of the wind turbine generator sets in control scheme one and control scheme two. According to... Figures 6 to 8 It can be seen that the ratio of the average power of control scheme 2 to that of control scheme 1 is 102.4%, the ratio of the average power of control scheme 3 to that of control scheme 1 is 101.4%, the ratio of the maximum load of control scheme 2 to that of control scheme 1 is 109.1%, and the ratio of the maximum load of control scheme 3 to that of control scheme 1 is 103.5%. The ratio of the increase in load and power generation of control scheme 2 relative to control scheme 1 is (109.1%-100%) / (102.4%-100%) = 3.8, and the ratio of the increase in load and power generation of control scheme 3 relative to control scheme 1 is (103.5%-100%) / (101.4%-100%) = 2.5. The larger the ratio of the increase in power generation, the greater the cost of increasing power generation. The cost of increasing power generation of control scheme 2 relative to control scheme 1 is greater than the cost of increasing power generation of control scheme 3 relative to control scheme 1. Therefore, it can be seen that the control method of the wind turbine generator set in this embodiment of the application incurs a lower cost in increasing the power generation of the wind turbine generator set.

[0067] The second aspect of this application provides a control device for a wind turbine generator set. This control device can be implemented as a controller for the wind turbine generator set or a remote control device, etc., and is not limited thereto. Figure 9 This is a schematic diagram of the control device for a wind turbine generator set provided in one embodiment of this application. Figure 9 As shown, the control device 200 of the wind turbine generator set may include an acquisition module 201, a torque determination module 202, and a control module 203.

[0068] The acquisition module 201 can be used to acquire the torque data and current speed of the wind turbine generator set.

[0069] The torque determination module 202 can be used to determine the target control parameters based on the current speed, the preset first target correspondence, and the torque trend obtained based on the torque data when the current speed is within the first speed range.

[0070] The target control parameters include target torque, or target torque and target speed. The speed in the first speed range is greater than or equal to the rated speed and less than or equal to the extended speed, and the torque in the first speed range in the first target correspondence is greater than or equal to the first torque corresponding to the rated speed.

[0071] In some examples, the ratio of extended speed to rated speed is greater than or equal to 1 and less than or equal to 1.3.

[0072] The control module 203 can be used to adjust the control parameters of the wind turbine generator set to the target control parameters.

[0073] In this embodiment, when the current speed of the wind turbine generator is within a first speed range, target control parameters are determined based on the current speed, the torque data of the wind turbine generator, and a preset first target correspondence. The control parameters of the wind turbine generator are then adjusted to the target control parameters. The target control parameters include target torque, or target torque and target speed. The speed in the first speed range is greater than or equal to the rated speed and less than or equal to the extended speed. In the first target correspondence, the torque within the first speed range is greater than or equal to the first torque corresponding to the rated speed. The wind turbine generator adjusts the target control parameters according to the first target correspondence. After reaching the rated speed, the speed of the wind turbine generator can continue to increase. When the speed is greater than the rated speed, the torque still changes with the speed and is greater than the first torque, thus extending the variable speed segment in the wind turbine generator's speed-torque curve. The blade performance is better in the variable speed segment compared to other conditions. The extension of the variable speed segment expands the operating range for optimal blade performance, thereby increasing the power generation of the wind turbine generator.

[0074] In some embodiments, the torque data includes a target torque prior to a predetermined period. The torque determination module 202 can be used to: determine that the torque trend is an increasing trend when the target torque prior to the predetermined period is less than or equal to a second torque, and determine the first sub-correspondence as a first target correspondence; determine the torque corresponding to the current speed in the first sub-correspondence as the target torque, and the target control parameters include the target torque.

[0075] In the first sub-correspondence, the rotational speed and torque within the first rotational speed range are positively correlated. The second torque is the torque corresponding to the extended rotational speed in the first sub-correspondence.

[0076] In some examples, the ratio of the second torque to the rated torque is greater than or equal to 0.5 and less than or equal to 0.7.

[0077] In some embodiments, the torque corresponding to the rated speed in the first sub-correspondence is the same as the torque corresponding to the rated speed within the second speed range in the second target correspondence. The speed in the second speed range is greater than or equal to the cut-in speed and less than or equal to the rated speed. The torque D and speed Ω in the first sub-correspondence and the second target correspondence satisfy the following relationship: k × Ω 2 =D. Where k is the coefficient of the optimal gain constant.

[0078] In some embodiments, the torque data includes a target torque prior to a predetermined period. The torque determination module 202 can be used to: obtain the target torque prior to the predetermined period; if the target torque prior to the predetermined period is greater than a second torque, determine that the torque trend is a decreasing trend and determine the second sub-correspondence as the first target correspondence; determine the rotational speed corresponding to the target torque prior to the predetermined period in the second sub-correspondence as the target rotational speed, and determine the torque corresponding to the target rotational speed in the second sub-correspondence as the target torque, wherein the target control parameters include the target rotational speed and the target torque.

[0079] In the second sub-correspondence, the rotational speed and torque within the first speed range are negatively correlated. The second torque is the torque corresponding to the extended speed range in the second sub-correspondence.

[0080] In some embodiments, the control module 203 may also be used to: control the speed of the wind turbine generator set to remain at the rated speed and increase the torque of the wind turbine generator set until the torque of the wind turbine generator set reaches the rated torque, where the third torque is the torque corresponding to the rated speed in the second sub-correspondence.

[0081] In some examples, the third torque is related to the wind turbine's maximum expected load and maximum expected power generation.

[0082] In some examples, the ratio of the third torque to the rated torque is greater than or equal to 0.8 and less than or equal to 1.

[0083] In some embodiments, the control module 203 can be used to adjust the operating parameters of the generator in the wind turbine generator set to adjust the torque of the wind turbine generator set to a target torque. For example, the torque of the wind turbine generator set can be adjusted to the target torque via a converter in the wind turbine generator set.

[0084] A third aspect of this application also provides a controller. Figure 10 This is a schematic diagram of the controller provided in one embodiment of this application. Figure 10 As shown, the controller 300 includes a memory 301, a processor 302, and a computer program stored in the memory 301 and executable on the processor 302.

[0085] In one example, the processor 302 described above may include a central processing unit (CPU), or an application-specific integrated circuit (ASIC), or one or more integrated circuits that may be configured to implement the embodiments of this application.

[0086] Memory 301 may include read-only memory (ROM), random access memory (RAM), disk storage media device, optical storage media device, flash memory device, electrical, optical, or other physical / tangible memory storage device. Therefore, typically, memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the control method for a wind turbine generator according to embodiments of this application.

[0087] The processor 302 reads the executable program code stored in the memory 301 to run the computer program corresponding to the executable program code, so as to implement the control method of the wind turbine generator set in the above embodiment.

[0088] In one example, controller 300 may also include communication interface 303 and bus 304. For example, Figure 10 As shown, the memory 301, processor 302, and communication interface 303 are connected through bus 304 and complete communication with each other.

[0089] The communication interface 303 is mainly used to realize communication between various modules, devices, units and / or equipment in the embodiments of this application. Input devices and / or output devices can also be connected through the communication interface 303.

[0090] Bus 304 includes hardware, software, or both, that couples components of controller 300 together. For example, and not limitingly, bus 304 may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hyper Transport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-E) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local Bus (VLB) bus, or other suitable buses, or combinations of two or more of these. Where appropriate, bus 304 may include one or more buses. Although specific buses are described and illustrated in the embodiments of this application, this application considers any suitable bus or interconnection.

[0091] A fourth aspect of this application also provides a computer-readable storage medium storing computer program instructions. When these computer program instructions are executed by a processor, they can implement the wind turbine generator control method described in the above embodiments and achieve the same technical effect. To avoid repetition, further details are omitted here. The aforementioned computer-readable storage medium may include non-transitory computer-readable storage media, such as read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks, etc., and is not limited thereto.

[0092] This application also provides a computer program product. When the instructions in the computer program product are executed by the processor of an electronic device, the electronic device performs the control method of the wind turbine generator set in the above embodiments and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0093] It should be clarified that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. For device embodiments, equipment embodiments, computer-readable storage medium embodiments, computer program product embodiments, etc., relevant parts can be referred to the description section of the method embodiments. This application is not limited to the specific steps and structures described above and shown in the figures. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of this application. Furthermore, for the sake of brevity, detailed descriptions of known methods and techniques are omitted here.

[0094] The aspects of this application have been described above with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It should be understood that each block in the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that these instructions, executable via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions / actions specified in one or more blocks of the flowchart illustrations and / or block diagrams. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field-programmable logic circuit. It is also understood that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can also be implemented by dedicated hardware performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0095] Those skilled in the art will understand that the above embodiments are exemplary and not restrictive. Different technical features appearing in different embodiments can be combined to achieve beneficial effects. Based on a study of the drawings, specification, and claims, those skilled in the art should be able to understand and implement other variations of the disclosed embodiments. In the claims, the term "comprising" does not exclude other means or steps; the quantifier "a" does not exclude a plurality; the terms "first" and "second" are used to identify names and not to indicate any particular order. Any reference numerals in the claims should not be construed as limiting the scope of protection. The functionality of multiple parts appearing in the claims can be implemented by a single hardware or software module. The appearance of certain technical features in different dependent claims does not mean that these technical features cannot be combined to achieve beneficial effects.

Claims

1. A control method for a wind turbine generator set, characterized in that, include: Obtain the torque data and current speed of the wind turbine generator set; When the current speed is within a first speed range, target control parameters are determined based on the current speed, a preset first target correspondence, and the torque trend obtained based on the torque data. The target control parameters include target torque, or may include both target torque and target speed. Wherein, the speed in the first speed range is greater than or equal to the rated speed and less than or equal to the extended speed, and the torque in the first speed range in the first target correspondence is greater than or equal to the first torque corresponding to the rated speed. In the first speed range in the first target correspondence, the torque first increases with the increase of the speed. When the torque reaches the second torque, the torque continues to increase with the decrease of the speed until the speed returns to the rated speed, the torque increases to the rated torque and remains at the rated torque, and the second torque is the torque corresponding to the extended speed. The control parameters of the wind turbine generator set are adjusted to the target control parameters.

2. The method according to claim 1, characterized in that, The torque data includes the target torque prior to the predetermined period; The first target correspondence includes a first sub-correspondence, wherein the rotational speed and torque within the first rotational speed range are positively correlated in the first sub-correspondence.

3. The method according to claim 2, characterized in that, The step of determining the target control parameters based on the current rotational speed, a preset first target correspondence, and the torque trend obtained from the torque data includes: If the target torque before the predetermined period is less than or equal to the second torque, the trend of torque is determined to be an increasing trend, and the first sub-correspondence is determined to be the first target correspondence, wherein the second torque is the torque corresponding to the extended speed in the first sub-correspondence; The torque corresponding to the current rotational speed in the first sub-correspondence is determined as the target torque.

4. The method according to claim 1, characterized in that, The torque data includes the target torque prior to the predetermined period; The first target correspondence includes a second sub-correspondence, wherein the rotational speed and torque within the first rotational speed range are negatively correlated in the second sub-correspondence.

5. The method according to claim 4, characterized in that, The step of determining the target control parameters based on the current rotational speed, a preset first target correspondence, and the torque trend obtained from the torque data includes: If the target torque is greater than the second torque before the predetermined period, the trend of torque is determined to be a decreasing trend, and the second sub-correspondence is determined to be the first target correspondence, wherein the second torque is the torque corresponding to the extended speed in the second sub-correspondence; The rotational speed corresponding to the target torque before the predetermined period in the second sub-correspondence is determined as the target rotational speed, and the torque corresponding to the target rotational speed in the second sub-correspondence is determined as the target torque.

6. The method according to claim 4, characterized in that, Also includes: If the target torque before the predetermined period is greater than or equal to the third torque but less than the rated torque, the speed of the wind turbine generator set is controlled to remain at the rated speed, and the torque of the wind turbine generator set is increased until the torque of the wind turbine generator set reaches the rated torque, wherein the third torque is the torque corresponding to the rated speed in the second sub-correspondence.

7. The method according to claim 6, characterized in that, The third torque is related to the maximum expected load and maximum expected power generation of the wind turbine generator set; The ratio of the third torque to the rated torque is greater than or equal to 0.8 and less than or equal to 1; The ratio of the second torque to the rated torque is greater than or equal to 0.5 and less than or equal to 0.

7.

8. The method according to claim 1, characterized in that, The ratio of the extended speed to the rated speed is greater than or equal to 1 and less than or equal to 1.

3.

9. The method according to claim 2, characterized in that, The torque corresponding to the rated speed in the first sub-correspondence is the same as the torque corresponding to the rated speed in the second speed range in the second target correspondence. The speed in the second speed range is greater than or equal to the cut-in speed and less than or equal to the rated speed. The torque D and speed Ω in the first sub-correspondence and the second target correspondence satisfy the following relationship: k×Ω 2 =D Where k is the coefficient of the optimal gain constant.

10. The method according to claim 1, characterized in that, The target control parameters include the target torque. The adjustment of the control parameters for controlling the wind turbine generator set to the target control parameters includes: Adjust the operating parameters of the generator in the wind turbine generator set to adjust the torque of the wind turbine generator set to the target torque.

11. A control device for a wind turbine generator set, characterized in that, include: The acquisition module is used to acquire the torque data and current speed of the wind turbine generator set; The torque determination module is used to determine target control parameters based on the current speed, a preset first target correspondence, and a torque trend obtained from the torque data, when the current speed is within a first speed range. The target control parameters include a target torque, or may include the target torque and a target speed. Wherein, the speed in the first speed range is greater than or equal to the rated speed and less than or equal to the extended speed, and the torque in the first speed range in the first target correspondence is greater than or equal to the first torque corresponding to the rated speed. In the first speed range in the first target correspondence, the torque first increases with the increase of the speed. When the torque reaches the second torque, the torque continues to increase with the decrease of the speed until the speed returns to the rated speed, the torque increases to the rated torque and remains at the rated torque, and the second torque is the torque corresponding to the extended speed. The control module is used to adjust the control parameters of the wind turbine generator set to the target control parameters.

12. A controller, characterized in that, include: Processor and memory storing computer program instructions; When the processor executes the computer program instructions, it implements the control method for the wind turbine generator set as described in any one of claims 1 to 10.

13. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer program instructions, which, when executed by a processor, implement the control method for a wind turbine generator as described in any one of claims 1 to 10.

Images