Control method and device for wind turbine generator set

Abstract

The present invention provides a control method and device for a wind turbine generator set. The control method includes: obtaining a current minimum pitch angle of the wind turbine generator set; deriving a critical stall tip speed ratio of the wind turbine generator set at the current minimum pitch angle from a critical stall tip speed ratio distribution of the wind turbine generator set, wherein the critical stall tip speed ratio distribution includes the critical stall tip speed ratios of the wind turbine generator set at various minimum pitch angles; predicting an operating condition of the wind turbine generator set at the current minimum pitch angle and the derived critical stall tip speed ratio; in response to the predicted operating condition failing to meet a desired performance indicator, adjusting the current minimum pitch angle; and controlling the operation of the wind turbine generator set using the adjusted minimum pitch angle.

Description

Technical Field

[0001] The present application relates to the technical field of wind power generation, and in particular to a control method and device for a wind turbine generator set. Background Art

[0002] During actual operation, wind turbine blades may stall due to numerous environmental factors, including geographical conditions, daytime, and season. Stalled operation alters the load and aerodynamic characteristics of the blades, causing vibration and power generation loss. Long-term stalling can even lead to blade breakage. Therefore, accurately predicting stall and implementing appropriate control measures can effectively reduce power generation losses and operational risks. Summary of the Invention

[0003] The object of the present invention is to provide a control method and device for a wind turbine generator set.

[0004] According to one aspect of the present invention, a control method for a wind turbine generator set is provided, the control method comprising: acquiring a current minimum pitch angle of the wind turbine generator set; deriving a critical stall tip speed ratio of the wind turbine generator set at the current minimum pitch angle from a critical stall tip speed ratio distribution of the wind turbine generator set, wherein the critical stall tip speed ratio distribution includes the critical stall tip speed ratios of the wind turbine generator set at various minimum pitch angles; predicting an operating condition of the wind turbine generator set at the current minimum pitch angle and the derived critical stall tip speed ratio; adjusting the current minimum pitch angle in response to the predicted operating condition failing to meet a desired performance indicator; and using the adjusted minimum pitch angle to control the operation of the wind turbine generator set.

[0005] Preferably, when the operating condition is characterized by the output power of the wind turbine generator set operating at the current minimum pitch angle and the derived critical stall tip speed ratio, the performance indicator is the full power of the wind turbine generator set.

[0006] Preferably, the predicting the operating condition of the wind turbine generator set at the current minimum pitch angle and the derived critical stall tip speed ratio includes: calculating the critical stall wind speed of the wind turbine generator set at the current minimum pitch angle based on relevant operating parameters of the wind turbine generator set and the derived critical stall tip speed ratio; deriving the power coefficient of the wind turbine generator set at the current minimum pitch angle and the derived critical stall tip speed ratio from the power coefficient distribution of the wind turbine generator set, wherein the power coefficient distribution includes the power coefficient of the wind turbine generator set at each tip speed ratio and minimum pitch angle; and predicting the output power of the wind turbine generator set operating at the current minimum pitch angle and the derived critical stall tip speed ratio based on the derived critical stall wind speed and the derived power coefficient.

[0007] Preferably, the adjusting of the current minimum pitch angle includes: calculating the equivalent wind speed of the wind turbine based on the predicted output power and the derived power coefficient; calculating the optimized tip speed ratio of the wind turbine according to the relevant operating parameters of the wind turbine and the equivalent wind speed; deriving the optimized minimum pitch angle of the wind turbine at the optimized tip speed ratio from the critical stall tip speed ratio distribution of the wind turbine; deriving the optimized power coefficient of the wind turbine at the optimized minimum pitch angle and the optimized tip speed ratio from the power coefficient distribution of the wind turbine; and adjusting the current minimum pitch angle to the optimized minimum pitch angle in response to the difference between the derived optimal power coefficient and the derived power coefficient being less than a predetermined convergence accuracy.

[0008] Preferably, the adjustment of the current minimum pitch angle also includes: in response to the difference between the derived optimal power coefficient and the derived power coefficient being greater than a predetermined convergence accuracy, using the derived optimal power coefficient as the last derived optimal power coefficient, and iteratively executing the steps of calculating the equivalent wind speed, calculating the optimal tip speed ratio, deriving the optimal minimum pitch angle, and deriving the optimal power coefficient until the difference between the derived optimal power coefficient and the last derived optimal power coefficient is less than the predetermined convergence accuracy; adjusting the current minimum pitch angle to the optimal minimum pitch angle obtained at the end of the iteration.

[0009] Preferably, the relevant operating parameters of the wind turbine generator set include the generator speed and impeller radius of the wind turbine generator set.

[0010] Preferably, the control method further comprises: recording the predicted output power and the adjusted minimum pitch angle in pairs into a blade stall control table of the wind turbine generator set.

[0011] Preferably, the control method further comprises: constructing a blade stall control distribution of the wind turbine generator set using the blade stall control table, wherein the blade stall control distribution comprises an optimal minimum pitch angle at each stall power point of the wind turbine generator set.

[0012] Preferably, the control method further comprises: in response to the wind turbine generator set running to a stall power point on the blade stall control distribution, adjusting a current minimum pitch angle of the wind turbine generator set to an optimal minimum pitch angle at the stall power point.

[0013] According to another aspect of the present invention, a control device for a wind turbine generator set is provided, the control device comprising: a pitch angle acquisition unit, configured to acquire a current minimum pitch angle of the wind turbine generator set; a tip speed ratio derivation unit, configured to derive a critical stall tip speed ratio of the wind turbine generator set at the current minimum pitch angle from a critical stall tip speed ratio distribution of the wind turbine generator set, wherein the critical stall tip speed ratio distribution includes the critical stall tip speed ratios of the wind turbine generator set at each minimum pitch angle; an operating condition prediction unit, configured to predict an operating condition of the wind turbine generator set at the current minimum pitch angle and the derived critical stall tip speed ratio; a pitch angle adjustment unit, configured to adjust the current minimum pitch angle in response to the operating condition failing to achieve a desired performance indicator; and a pitch angle control unit, configured to use the adjusted minimum pitch angle to control the operation of the wind turbine generator set.

[0014] Preferably, when the operating condition is characterized by the output power of the wind turbine generator set operating at the current minimum pitch angle and the derived critical stall tip speed ratio, the performance indicator is the full power of the wind turbine generator set.

[0015] Preferably, the operating condition prediction unit includes: a critical wind speed calculation unit, configured to calculate the critical stall wind speed of the wind turbine at the current minimum pitch angle based on relevant operating parameters of the wind turbine and the derived critical stall tip speed ratio; a power coefficient derivation unit, configured to derive the power coefficient of the wind turbine at the current minimum pitch angle and the derived critical stall tip speed ratio from the power coefficient distribution of the wind turbine, wherein the power coefficient distribution includes the power coefficient of the wind turbine at each tip speed ratio and minimum pitch angle; an output power calculation unit, configured to predict the output power of the wind turbine operating at the current minimum pitch angle and the derived critical stall tip speed ratio based on the derived critical stall wind speed and the derived power coefficient.

[0016] Preferably, the pitch angle adjustment unit is configured to: calculate the equivalent wind speed of the wind turbine generator set based on the predicted output power and the derived power coefficient; calculate the optimized tip speed ratio of the wind turbine generator set according to the relevant operating parameters of the wind turbine generator set and the equivalent wind speed; derive the optimized minimum pitch angle of the wind turbine generator set at the optimized tip speed ratio from the critical stall tip speed ratio distribution of the wind turbine generator set; derive the optimized power coefficient of the wind turbine generator set at the optimized minimum pitch angle and the optimized tip speed ratio from the power coefficient distribution of the wind turbine generator set; in response to the difference between the derived optimal power coefficient and the derived power coefficient being less than a predetermined convergence accuracy, adjust the current minimum pitch angle to the optimized minimum pitch angle.

[0017] Preferably, the pitch angle adjustment unit is further configured to: in response to the difference between the derived optimal power coefficient and the derived power coefficient being greater than a predetermined convergence accuracy, use the derived optimal power coefficient as the last derived optimal power coefficient, and iteratively execute the steps of calculating the equivalent wind speed, calculating the optimal tip speed ratio, deriving the optimal minimum pitch angle, and deriving the optimal power coefficient until the difference between the derived optimal power coefficient and the last derived optimal power coefficient is less than the predetermined convergence accuracy; and adjust the current minimum pitch angle to the optimal minimum pitch angle obtained at the end of the iteration.

[0018] Preferably, the relevant operating parameters of the wind turbine generator set include the generator speed and impeller radius of the wind turbine generator set.

[0019] Preferably, the control device further comprises: a stall control recording unit configured to record the predicted output power and the adjusted minimum pitch angle in pairs into a blade stall control table of the wind turbine generator set.

[0020] Preferably, the control device further comprises: a stall control construction unit configured to: construct a blade stall control distribution of the wind turbine using the blade stall control table, wherein the blade stall control distribution comprises an optimal minimum pitch angle at each stall power point of the wind turbine.

[0021] Preferably, the control device further includes: a second pitch angle adjustment unit, configured to: in response to the wind turbine generator set running to the stall power point on the blade stall control distribution, adjust the current minimum pitch angle of the wind turbine generator set to an optimal minimum pitch angle at the stall power point.

[0022] According to another aspect of the present invention, a computer-readable storage medium storing a computer program is provided. When the computer program is executed by a processor, the control method for a wind turbine generator set as described above is implemented.

[0023] According to another aspect of the present invention, a computer device is provided, comprising: a processor; and a memory storing a computer program. When the computer program is executed by the processor, the control method for a wind turbine generator set as described above is implemented.

[0024] According to the exemplary embodiments of the present invention, the control method and device for a wind turbine generator set can more accurately identify the possible stall risk of the wind turbine generator set without adding new investment (such as additional hardware equipment) to actively avoid the occurrence of a stall condition. In addition, it can also prevent blade stall while allowing the wind turbine generator set to operate as close to the aerodynamic boundary of the wind turbine generator set as possible and maintain maximum wind energy utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above objects and features of the present invention will become more apparent from the following description in conjunction with the accompanying drawings, in which:

[0026] Figure 1 A schematic diagram showing a critical stall tip speed ratio distribution for a wind turbine generator system according to an exemplary embodiment of the present invention is shown;

[0027] Figure 2 A schematic diagram illustrating a power coefficient distribution for a wind turbine generator system according to an exemplary embodiment of the present invention is shown;

[0028] Figure 3 A flow chart showing a control method for a wind turbine generator system according to an exemplary embodiment of the present invention is shown;

[0029] Figure 4 shows a schematic process for stall control of a wind turbine according to an exemplary embodiment of the present invention;

[0030] Figure 5 1. A schematic process for optimizing the minimum pitch angle of a wind turbine generator system according to an exemplary embodiment of the present invention is shown;

[0031] Figure 6 A schematic diagram illustrating a blade stall control distribution for a wind turbine according to an exemplary embodiment of the present invention is shown;

[0032] Figure 7 Another schematic diagram illustrating a blade stall control profile for a wind turbine according to an exemplary embodiment of the present invention is shown;

[0033] Figure 8 A structural block diagram showing a control device for a wind turbine generator set according to an exemplary embodiment of the present invention; and

[0034] Figure 9A schematic diagram of a system architecture for a wind turbine generator system according to an exemplary embodiment of the present invention is shown. DETAILED DESCRIPTION

[0035] The present invention utilizes the characteristic of a wind turbine generator set's critical stall tip speed ratio, which lies between stalled and non-stalled conditions, to predict the wind turbine generator set's stall conditions at different minimum pitch angles, and adjusts the wind turbine generator set's minimum pitch angle based on these stall conditions. This method of predicting stall conditions based on the wind turbine generator set's stall mechanism can more accurately identify the potential stall risk of the wind turbine generator set, proactively avoiding the occurrence of stall conditions. Furthermore, by optimizing the minimum pitch angle, the wind turbine generator set can operate as close to its aerodynamic boundaries as possible while ensuring unit safety and consistently maintaining maximum wind energy utilization.

[0036] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0037] Figure 1 A schematic diagram 100 is shown of a critical stall tip speed ratio distribution for a wind turbine according to an exemplary embodiment of the present invention.

[0038] Reference Figure 1 According to an exemplary embodiment of the present invention, a critical stall tip speed ratio distribution 101 for a wind turbine generator set may include the critical stall tip speed ratios of the wind turbine generator set at various minimum pitch angles, and the critical stall tip speed ratio may be between the stall condition and the non-stall condition of the wind turbine generator set. Therefore, the critical stall tip speed ratio may be used to indicate a critical value at which the wind turbine generator set is about to enter a stall state. Generally speaking, the greater the tip speed ratio of a wind turbine generator set, the lower the risk of the wind turbine generator set being in a stall state. Therefore, when the tip speed ratio of a wind turbine generator set is located at Figure 1 When the critical stall tip speed ratio distribution is above 101, it indicates that the wind turbine generator set is in a non-stall condition; when the tip speed ratio of the wind turbine generator set is at Figure 1 When the critical stall peak speed ratio distribution is below 101, it indicates that the wind turbine generator set is in a stall condition.

[0039] Figure 2 A schematic diagram 200 of a power coefficient distribution for a wind turbine according to an exemplary embodiment of the present invention is shown.

[0040] Reference Figure 2, the power coefficient distribution 201 of the wind turbine generator set according to the exemplary embodiment of the present invention may include the power coefficient (also called the maximum power coefficient or the maximum wind energy utilization coefficient) of the wind turbine generator set at each tip speed ratio and the minimum pitch angle, and the power coefficient may represent the conversion efficiency of the wind turbine generator set in converting wind energy into electrical energy. Therefore, the power coefficient is one of the important indicators for considering the operating performance of the wind turbine generator set, and it is not affected by the surrounding air density. In actual use, the larger the power coefficient, the greater the output power of the wind turbine generator set and the higher the efficiency; conversely, the smaller the power coefficient, the smaller the output power of the wind turbine generator set and the lower the efficiency.

[0041] Figure 3 A flow chart 300 is shown of a control method for a wind turbine according to an exemplary embodiment of the present invention.

[0042] Reference Figure 3 , Figure 3 The control method shown may include the following steps:

[0043] In step 310 , the current minimum pitch angle of the wind turbine generator system may be obtained.

[0044] In step 320 , the critical stall tip speed ratio of the wind turbine at the current minimum pitch angle may be derived from the critical stall tip speed ratio distribution of the wind turbine, wherein the critical stall tip speed ratio distribution may include the critical stall tip speed ratios of the wind turbine at each minimum pitch angle.

[0045] In step 330 , the operating condition of the wind turbine generator system under the current minimum pitch angle and the derived critical stall tip speed ratio may be predicted.

[0046] At step 340 , the current minimum pitch angle may be adjusted in response to the predicted operating conditions not meeting the desired performance criteria.

[0047] In one example, when the operating condition can be characterized by the output power of the wind turbine generator set operating at the current minimum pitch angle and the derived critical stall tip speed ratio, the performance indicator may be the full power of the wind turbine generator set.

[0048] In this example, the critical stall wind speed of the wind turbine generator set at the current minimum pitch angle can be calculated based on relevant operating parameters of the wind turbine generator set and the derived critical stall tip speed ratio; the power coefficient of the wind turbine generator set at the current minimum pitch angle and the derived critical stall tip speed ratio is derived from the power coefficient distribution of the wind turbine generator set, wherein the power coefficient distribution may include the power coefficient of the wind turbine generator set at various tip speed ratios and minimum pitch angles; and the output power of the wind turbine generator set operating at the current minimum pitch angle and the derived critical stall tip speed ratio is predicted based on the derived critical stall wind speed and the derived power coefficient.

[0049] Accordingly, when the predicted output power does not reach full power, the current minimum pitch angle can be adjusted; when the predicted output power reaches full power, the current minimum pitch angle can be kept unchanged. Generally speaking, the larger the minimum pitch angle of a wind turbine, the lower the risk of the wind turbine stalling. In this example, the minimum pitch angle of the wind turbine can be increased to prevent the wind turbine from entering the stall region. Although this method can achieve the purpose of actively avoiding blade stall, it cannot ensure that the wind turbine maintains maximum wind energy utilization (i.e., maximizes wind energy utilization).

[0050] Therefore, in order to obtain the optimal minimum pitch angle so that the wind turbine can maximize wind energy utilization while avoiding blade stall, in this example, the equivalent wind speed of the wind turbine can also be calculated based on the predicted output power and the derived power coefficient; the optimal tip speed ratio of the wind turbine can be calculated according to the relevant operating parameters of the wind turbine and the equivalent wind speed; the optimal minimum pitch angle of the wind turbine at the optimal tip speed ratio is derived from the critical stall tip speed ratio distribution of the wind turbine; the optimal power coefficient of the wind turbine at the optimal minimum pitch angle and the optimal tip speed ratio is derived from the power coefficient distribution of the wind turbine; and in response to the difference between the derived optimal power coefficient and the derived power coefficient being less than a predetermined convergence accuracy, the current minimum pitch angle is adjusted to the optimal minimum pitch angle.

[0051] In an embodiment of the present invention, information such as the wind speed of the wind turbine generator set can be measured by a remote sensing device such as a radar, thereby providing more optimization time and improving the control time accuracy. In addition, in this example, in response to the difference between the derived optimal power coefficient and the derived power coefficient being greater than a predetermined convergence accuracy, the derived optimal power coefficient can be used as the last derived optimal power coefficient, and the steps of calculating the equivalent wind speed, calculating the optimal tip speed ratio, deriving the optimal minimum pitch angle, and deriving the optimal power coefficient described above are iteratively performed until the difference between the derived optimal power coefficient and the last derived optimal power coefficient is less than a predetermined convergence accuracy; and the current minimum pitch angle is adjusted to the optimal minimum pitch angle obtained at the end of the iteration. The minimum pitch angle obtained by adopting this iterative optimization method can enable the wind turbine generator set to operate as close to the aerodynamic boundary of the wind turbine generator set as possible while avoiding blade stall and always maintaining the maximum wind energy utilization rate.

[0052] Return again Figure 3 In step 350 , the adjusted minimum pitch angle may be used to control the operation of the wind turbine to actively avoid blade stall.

[0053] To provide optimal minimum pitch angle control parameters for future wind turbine control, and to avoid redundant and unnecessary calculations that would otherwise occupy or consume computing resources (such as memory) within the wind turbine controller, in one example, the predicted output power and the adjusted minimum pitch angle are recorded in pairs in a blade stall control table for the wind turbine. This provides a corresponding pitch control reference for future stall control of the wind turbine.

[0054] Because the data in the blade stall control table is only applicable to providing pitch control references for the same or similar stall conditions, in another example, the blade stall control table can be used to construct a blade stall control profile for the wind turbine generator set, in order to ensure that the data in the blade stall control table is applicable to stall conditions not recorded in the blade stall control table, or to all stall conditions. The blade stall control profile includes the optimal minimum pitch angle at each stall power point of the wind turbine generator set. For example, but not limited to, a blade stall control curve can be fitted to a plurality of data points recorded in the blade stall control table. Accordingly, in this example, in response to the wind turbine generator set reaching a stall power point on the blade stall control profile, the current minimum pitch angle of the wind turbine generator set can be adjusted to the optimal minimum pitch angle at that stall power point.

[0055] Optionally, after obtaining the blade stall control table of the wind turbine generator set, corresponding control parameters may continue to be collected, and parameters with low accuracy may be eliminated through an optimization model, thereby improving control accuracy.

[0056] It should be understood that although the above describes examples of determining whether to perform stall control on a wind turbine generator set and optimizing the minimum pitch angle for stall control by predicting the output power of the wind turbine generator set operating at the current minimum pitch angle and the critical stall tip speed ratio corresponding to the current minimum pitch angle, these examples are merely exemplary and the present invention is not limited thereto. Other operating parameters of the wind turbine generator set (e.g., the generator speed of the wind turbine generator set, etc.) may also be selected to perform the above operations. It should be noted that the specific processing procedures for the above operations will also vary depending on the selection of different operating parameters. No further details will be given here.

[0057] Below, we will refer to Figure 4 The process of determining whether to perform stall control on a wind turbine generator set by predicting output power is described in detail.

[0058] Figure 4 An exemplary process 400 for stall control of a wind turbine is shown according to an exemplary embodiment of the present invention.

[0059] Reference Figure 4 , process 400 may be initiated.

[0060] At operation 401, process 400 may monitor the current minimum pitch angle of the wind turbine in real time via corresponding sensors installed on the wind turbine. Furthermore, filtering may be performed on the monitored minimum pitch angle to remove glitches in the time series data, thereby preventing abnormal value information from entering the control system and negatively impacting the accuracy of stall control.

[0061] At operation 402, process 400 may determine the minimum pitch angle of the wind turbine according to the current minimum pitch angle of the wind turbine. Figure 1 A one-dimensional interpolation calculation is performed on the critical stall tip speed ratio distribution shown to obtain the critical stall tip speed ratio of the wind turbine generator set at the current minimum pitch angle.

[0062] In operation 403, the process 400 may calculate the critical stall wind speed of the wind turbine at the current minimum pitch angle based on the generator speed and the rotor radius of the wind turbine. For example, the critical stall wind speed may be calculated by, but not limited to, the following formula (1):

[0063] V stall =Ω*R / λ stall (1)

[0064] In formula (1), Ω is the generator speed of the wind turbine generator set, R is the impeller radius of the wind turbine generator set, and λ is the stall is the critical stall tip speed ratio of the wind turbine at the current minimum pitch angle, V stall is the critical stall wind speed of the wind turbine at the current minimum pitch angle.

[0065] At operation 404, the process 400 may compare the critical stall tip speed of the wind turbine generator system with the current minimum pitch angle of the wind turbine generator system. Figure 2 The power coefficient distribution shown is subjected to two-dimensional interpolation calculation to obtain the power coefficient of the wind turbine at the current minimum pitch angle and critical stall tip speed ratio.

[0066] At operation 405, the process 400 may calculate the output power of the wind turbine operating at the current minimum pitch angle and the critical stall tip speed ratio based on the critical stall tip speed ratio of the wind turbine at the current minimum pitch angle and the power coefficient of the wind turbine at the current minimum pitch angle and the critical stall tip speed ratio. For example, the output power may be calculated by, but not limited to, the following equation (2):

[0067] P est =0.5*ρπR 2 *Cp est *V stall 3 (2)

[0068] In formula (2), ρ is the air density around the wind turbine, R is the impeller radius of the wind turbine, and Cp is est The power coefficient of the wind turbine at the current minimum pitch angle and critical stall tip speed ratio, V stall is the critical stall wind speed of the wind turbine at the current minimum pitch angle, P est is the output power of the wind turbine generator set operating at the current minimum pitch angle and critical stall tip speed ratio.

[0069] In operation 406, if the output power of the wind turbine generator set operating at the current minimum pitch angle and the critical stall tip speed ratio does not reach the full power of the wind turbine generator set, the process 400 may determine that the wind turbine generator set may be at risk of stalling and enter operation 407; otherwise, the process 400 may return to operation 401 and continue to monitor the current minimum pitch angle of the wind turbine generator set.

[0070] At operation 407 , process 400 may adjust the current minimum pitch angle and use the adjusted minimum pitch angle to control the operation of the fleet.

[0071] After operation 407 , process 400 may end.

[0072] It should be understood that although Figure 4 A schematic process for stall control of a wind turbine generator system according to an exemplary embodiment of the present invention is shown, but the present invention is not limited thereto.

[0073] Below, we will refer to Figure 5 The process of optimizing the minimum pitch angle for stall control is described in detail.

[0074] Figure 5 An exemplary process 500 for optimizing the minimum pitch angle of a wind turbine according to an exemplary embodiment of the present invention is shown.

[0075] Reference Figure 5 When it is determined that the unit is at risk of stalling, the process 500 may be initiated to perform minimum pitch angle optimization.

[0076] In operation 501, the process 500 may calculate the equivalent wind speed of the wind turbine generator set based on the output power of the wind turbine generator set operating at the current minimum pitch angle and the critical stall tip speed ratio and the power coefficient of the wind turbine generator set at the current minimum pitch angle and the critical stall tip speed ratio. For example, the equivalent wind speed may be calculated by, but not limited to, the following equation (3):

[0077] V itr =(P itr / (0.5*ρπR 2 *Cp itr )) 1 / 3 (3)

[0078] In formula (3), ρ is the air density around the wind turbine generator set, R is the impeller radius of the wind turbine generator set, and P itr is the output power of the wind turbine generator set operating at the current minimum pitch angle and critical stall tip speed ratio, Cp itr is the power coefficient of the wind turbine at the current minimum pitch angle and critical stall tip speed ratio, V itr is the equivalent wind speed of the wind turbine.

[0079] In operation 502, the process 500 may calculate the optimal tip speed ratio of the wind turbine generator set based on the generator speed, the impeller radius, and the equivalent wind speed of the wind turbine generator set. For example, the optimal tip speed ratio may be calculated by, but is not limited to, the following formula (4):

[0080] λ itr =Ω*R / V itr (4)

[0081] In formula (4), Ω is the generator speed of the wind turbine generator set, R is the impeller radius of the wind turbine generator set, V itr is the equivalent wind speed of the wind turbine generator set, λ itr To find the optimal tip speed ratio of wind turbines.

[0082] In operation 503, the process 500 may compare the wind turbine generator system with the optimal tip speed. Figure 1 The critical stall tip speed ratio distribution shown is subjected to one-dimensional interpolation calculation to obtain the optimal minimum pitch angle for the wind turbine generator set to avoid stall.

[0083] At operation 504, the process 500 may compare the wind turbine generator system with the optimal minimum pitch angle and the optimal tip speed. Figure 2 The power coefficient distribution shown is subjected to two-dimensional interpolation calculation to obtain the optimal power coefficient of the wind turbine generator set under the optimal minimum pitch angle and the optimal tip speed ratio.

[0084] At operation 505, if the difference between the optimized power coefficient of the wind turbine generator set at the optimized minimum pitch angle and optimized tip speed ratio and the power coefficient of the wind turbine generator set at the current minimum pitch angle and critical stall tip speed ratio is less than a predetermined convergence accuracy, process 500 may proceed to operation 506. Otherwise, process 500 may use the optimized power coefficient as the power coefficient and return to operation 501 to iteratively execute operations 501 to 504 until the difference is less than the predetermined convergence accuracy. The minimum pitch angle thus obtained is the optimal adjustment control parameter, which can maintain the maximum wind energy utilization rate of the wind turbine generator set while ensuring the safety of the unit operation.

[0085] At operation 506 , process 500 adjusts the current minimum pitch angle of the wind turbine to the optimized minimum pitch angle.

[0086] After operation 506, process 500 may end.

[0087] It should be understood that although Figure 5 A schematic process 500 for optimizing the minimum pitch angle of a wind turbine generator set according to an exemplary embodiment of the present invention is shown, but the present invention is not limited thereto, and other methods may be used to optimize the minimum pitch angle, as long as the obtained minimum pitch angle can maintain the maximum wind energy utilization rate for the operation of the wind turbine generator set while ensuring the safety of the unit operation.

[0088] It should be understood that although Figure 5 A schematic process for optimizing the minimum pitch angle of a wind turbine generator system according to an exemplary embodiment of the present invention is shown, but the present invention is not limited thereto.

[0089] Figure 6 A schematic diagram 600 is shown of a blade stall control profile for a wind turbine according to an exemplary embodiment of the present invention.

[0090] Reference Figure 6 , a blade stall control profile 601 of a wind turbine according to an exemplary embodiment of the present invention may include an optimal minimum pitch angle at each stall power point of the wind turbine. Figure 6 The blade stall control distribution 601 shown can provide the wind turbine with the optimal minimum pitch angle control parameters in the future stall condition or in the current non-stall condition. Figure 6 At a certain stall power point in the blade stall control distribution 601 shown, the current minimum pitch angle of the wind turbine generator set may be adjusted to an optimal minimum pitch angle at the stall power point.

[0091] Figure 7 Another schematic diagram 700 is shown for a blade stall control profile for a wind turbine according to an exemplary embodiment of the present invention.

[0092] Reference Figure 7 According to an exemplary embodiment of the present invention, the blade stall control distribution of a wind turbine generator set may include the optimal minimum pitch angle of the wind turbine generator set at each stall power point at different air densities. It can be seen that different air densities pho correspond to different blade stall control distributions. In this way, the minimum pitch angle adjustment for the stall condition can be determined based on the information of the two dimensions of air density and stall power. It can be seen that using Figure 7 The blade stall control distribution shown can be obtained using Figure 6The blade stall control shown distributes a better minimum pitch angle adjustment, thereby achieving the best unit control effect.

[0093] Figure 8 A structural block diagram 800 of a control device for a wind turbine generator system according to an exemplary embodiment of the present invention is shown.

[0094] Reference Figure 8 , Figure 8 The control device shown may include a pitch angle acquisition unit 810, a tip speed ratio derivation unit 820, an operating condition prediction unit 830, a pitch angle adjustment unit 840 and a pitch angle control unit 850, wherein the pitch angle acquisition unit 810 may be configured to acquire a current minimum pitch angle of the wind turbine generator set; the tip speed ratio derivation unit 820 may be configured to derive a critical stall tip speed ratio of the wind turbine generator set at the current minimum pitch angle from a critical stall tip speed ratio distribution of the wind turbine generator set, wherein the critical stall tip speed ratio distribution includes the critical stall tip speed ratios of the wind turbine generator set at each minimum pitch angle; the operating condition prediction unit 830 may be configured to predict the operating condition of the wind turbine generator set at the current minimum pitch angle and the derived critical stall tip speed ratio; the pitch angle adjustment unit 840 may be configured to adjust the current minimum pitch angle in response to the operating condition failing to meet the desired performance indicator; and the pitch angle control unit 850 may be configured to use the adjusted minimum pitch angle to control the operation of the wind turbine generator set.

[0095] exist Figure 8 In the control device shown, when the operating condition can be characterized by the output power of the wind turbine generator set operating at the current minimum pitch angle and stall tip speed ratio, the performance indicator can be the full power of the wind turbine generator set.

[0096] exist Figure 8 In the control device shown, the operating condition prediction unit 830 may include a critical wind speed calculation unit, a power coefficient derivation unit and an output power calculation unit (all not shown), wherein the critical wind speed calculation unit may be configured to calculate the critical stall wind speed of the wind turbine at the current minimum pitch angle based on the relevant operating parameters of the wind turbine and the derived critical stall tip speed ratio; the power coefficient derivation unit may be configured to derive the power coefficient of the wind turbine at the current minimum pitch angle and the derived critical stall tip speed ratio from the power coefficient distribution of the wind turbine, wherein the power coefficient distribution includes the power coefficient of the wind turbine at each tip speed ratio and minimum pitch angle; the output power calculation unit may be configured to predict the output power of the wind turbine operating at the current minimum pitch angle and the derived critical stall tip speed ratio based on the derived critical stall wind speed and the derived power coefficient.

[0097] exist Figure 8In the control device shown, the pitch angle adjustment unit 840 can be configured to calculate the equivalent wind speed of the wind turbine generator set based on the predicted output power and the derived power coefficient; calculate the optimal tip speed ratio of the wind turbine generator set according to the relevant operating parameters of the wind turbine generator set and the equivalent wind speed; derive the optimal minimum pitch angle of the wind turbine generator set at the optimal tip speed ratio from the critical stall tip speed ratio distribution of the wind turbine generator set; derive the optimal power coefficient of the wind turbine generator set at the optimal minimum pitch angle and the optimal tip speed ratio from the power coefficient distribution of the wind turbine generator set; and adjust the current minimum pitch angle to the optimal minimum pitch angle in response to the difference between the derived optimal power coefficient and the derived power coefficient being less than a predetermined convergence accuracy.

[0098] exist Figure 8 In the control device shown, the pitch angle adjustment unit 840 can also be configured to use the derived optimal power coefficient as the last derived optimal power coefficient in response to the difference between the derived optimal power coefficient and the derived power coefficient being greater than a predetermined convergence accuracy, and iteratively perform the steps of calculating the equivalent wind speed, calculating the optimal tip speed ratio, deriving the optimal minimum pitch angle, and deriving the optimal power coefficient until the difference between the derived optimal power coefficient and the last derived optimal power coefficient is less than the predetermined convergence accuracy; and adjust the current minimum pitch angle to the optimal minimum pitch angle obtained at the end of the iteration.

[0099] exist Figure 8 In the control device shown, the relevant operating parameters of the wind turbine generator set may include, but are not limited to, the generator speed and the impeller radius of the wind turbine generator set.

[0100] in addition, Figure 8 The control device shown may further include a stall control recording unit (not shown), which may be configured to record the predicted output power and the adjusted minimum pitch angle in pairs into a blade stall control table of the wind turbine generator set.

[0101] Further, Figure 8 The control device shown may further include a stall control construction unit (not shown), which may be configured to use the blade stall control table to construct a blade stall control distribution of the wind turbine generator set, wherein the blade stall control distribution includes an optimal minimum pitch angle at each stall power point of the wind turbine generator set.

[0102] Further, Figure 8 The control device shown may further include a second pitch angle adjustment unit (not shown), which may be configured to adjust the current minimum pitch angle of the wind turbine to an optimal minimum pitch angle at the stall power point in response to the wind turbine operating to the stall power point on the blade stall control distribution.

[0103] Figure 9 A schematic diagram 900 is shown of a system architecture for a wind turbine according to an exemplary embodiment of the present invention.

[0104] Reference Figure 9 , a system architecture for a wind turbine generator system according to an exemplary embodiment of the present invention may include Figure 8 The control device 910, wind turbine generator set 920 and wind turbine generator set controller 930 are shown (such as, but not limited to, a main control PLC system or a pitch control system in the wind turbine generator set). The control method for a wind turbine generator set according to an exemplary embodiment of the present invention can be run as an algorithm in a computing unit of the control device 910, and the control device 910 may include, but not limited to, Figure 8 The pitch angle acquisition unit 810, the tip speed ratio derivation unit 820, the operating condition prediction unit 830, the pitch angle adjustment unit 840 and the pitch angle control unit 850 are shown.

[0105] exist Figure 9 In the system architecture shown, Figure 1 The critical stall tip speed ratio distribution A shown is loaded into the control device 910, and the current minimum pitch angle B is input to the control device 910. The control device 910 can be Figure 1 The critical stall tip speed ratio distribution A shown derives the critical stall tip speed ratio of the wind turbine at the current minimum pitch angle B, predicts the operating conditions of the wind turbine at the current minimum pitch angle B and the derived critical stall tip speed ratio, and adjusts the current minimum pitch angle in response to the predicted operating conditions failing to meet the desired performance indicator. The adjusted minimum pitch angle is transmitted by the wind turbine controller 930 to the wind turbine 920, causing the wind turbine 320 to operate at the adjusted minimum pitch angle. This method of predicting stall conditions by leveraging the stall mechanism of the wind turbine can more accurately identify the potential stall risk of the wind turbine, thereby proactively avoiding the occurrence of stall conditions.

[0106] It should be understood that although Figure 9 The system architecture of a wind turbine generator set according to an exemplary embodiment of the present invention is shown, but the present invention is not limited thereto. For example, the control device 910 may also be provided between the wind turbine generator set controller 930 and the wind turbine generator set 920, as long as the current minimum pitch angle of the wind turbine generator set can be actively adjusted. In addition, Figure 9 In addition to being integrated into a separate controller, the control device 910 shown may also be integrated into a wind turbine controller 930 or a background controller for scheduling wind turbines in a wind farm, or other control devices that may be connected to the wind turbine controller 930 or the wind turbine 920. The present invention is not limited thereto.

[0107] According to the exemplary embodiments of the present invention, the control method and device for a wind turbine generator set can more accurately identify the possible stall risk of the wind turbine generator set without adding new investment (such as additional hardware equipment) to actively avoid the occurrence of a stall condition. In addition, it can also prevent blade stall while allowing the wind turbine generator set to operate as close to the aerodynamic boundary of the wind turbine generator set as possible and maintain maximum wind energy utilization.

[0108] According to an exemplary embodiment of the present invention, a computer-readable storage medium storing a computer program may also be provided. The computer-readable storage medium stores a computer program that, when executed by a processor, causes the processor to perform the control method for a wind turbine generator system according to the present invention. The computer-readable recording medium is any data storage device that can store data read by a computer system. Examples of computer-readable recording media include read-only memory, random access memory, read-only optical discs, magnetic tapes, floppy disks, optical data storage devices, and carrier waves (such as data storage via the Internet via a wired or wireless transmission path).

[0109] According to an exemplary embodiment of the present invention, a computer device is further provided. The computer device includes a processor and a memory. The memory is configured to store a computer program. The computer program is executed by the processor so that the processor executes the computer program for the control method for a wind turbine generator system according to the present invention.

[0110] While the present application has been shown and described with reference to the preferred embodiments, it will be understood by those skilled in the art that various modifications and variations can be made to these embodiments without departing from the spirit and scope of the present application as defined by the appended claims.

Claims

1. A control method for a wind turbine generator set, characterized in that: The control method includes: Obtaining a current minimum pitch angle of the wind turbine generator set; deriving a critical stall tip speed ratio of the wind turbine generator set at the current minimum pitch angle from a critical stall tip speed ratio distribution of the wind turbine generator set, wherein the critical stall tip speed ratio distribution includes the critical stall tip speed ratios of the wind turbine generator set at each minimum pitch angle; Predicting an operating condition of the wind turbine generator set under the current minimum pitch angle and the derived critical stall tip speed ratio; In response to the predicted operating condition failing to meet the expected performance indicator, adjusting the current minimum pitch angle; Using the adjusted minimum pitch angle to control the operation of the wind turbine generator set; The operating condition is characterized by the output power of the wind turbine generator set operating at the current minimum pitch angle and the derived critical stall tip speed ratio, and the performance indicator is the full power of the wind turbine generator set.

2. The control method according to claim 1, characterized in that: The predicting of the operating condition of the wind turbine generator set under the current minimum pitch angle and the derived critical stall tip speed ratio includes: Calculating a critical stall wind speed of the wind turbine generator set at the current minimum pitch angle according to relevant operating parameters of the wind turbine generator set and the derived critical stall tip speed ratio; deriving a power coefficient of the wind turbine generator set at the current minimum pitch angle and the derived critical stall tip speed ratio from a power coefficient distribution of the wind turbine generator set, wherein the power coefficient distribution includes the power coefficient of the wind turbine generator set at each tip speed ratio and minimum pitch angle; Based on the derived critical stall wind speed and the derived power coefficient, the output power of the wind turbine generator system operating at the current minimum pitch angle and the derived critical stall tip speed ratio is predicted.

3. The control method according to claim 2, characterized in that: The adjusting the current minimum pitch angle includes: Calculating an equivalent wind speed of the wind turbine generator system based on the predicted output power and the derived power coefficient; Calculating an optimal tip speed ratio of the wind turbine generator set according to relevant operating parameters of the wind turbine generator set and the equivalent wind speed; deriving an optimized minimum pitch angle of the wind turbine generator set at the optimized tip speed ratio from a critical stall tip speed ratio distribution of the wind turbine generator set; deriving the optimized power coefficient of the wind turbine generator set at the optimized minimum pitch angle and the optimized tip speed ratio from the power coefficient distribution of the wind turbine generator set; In response to a difference between the derived optimal power coefficient and the derived power coefficient being less than a predetermined convergence accuracy, the current minimum pitch angle is adjusted to the optimized minimum pitch angle.

4. The control method according to claim 3, characterized in that: The adjusting the current minimum pitch angle further includes: In response to the difference between the derived optimal power coefficient and the derived power coefficient being greater than a predetermined convergence accuracy, the derived optimal power coefficient is used as the last derived optimal power coefficient, and the steps of calculating the equivalent wind speed, calculating the optimal tip speed ratio, deriving the optimal minimum pitch angle, and deriving the optimal power coefficient are iteratively performed until the difference between the derived optimal power coefficient and the last derived optimal power coefficient is less than the predetermined convergence accuracy; The current minimum pitch angle is adjusted to the optimized minimum pitch angle obtained at the end of the iteration.

5. The control method according to claim 4, characterized in that: The relevant operating parameters of the wind turbine generator set include the generator speed and impeller radius of the wind turbine generator set.

6. The control method according to any one of claims 1 to 5, characterized in that: The control method further includes: The predicted output power and the adjusted minimum pitch angle are recorded in pairs in a blade stall control table of the wind turbine generator set.

7. The control method according to claim 6, characterized in that: The control method further includes: The blade stall control table is used to construct a blade stall control distribution of the wind turbine generator set, wherein the blade stall control distribution includes an optimal minimum pitch angle at each stall power point of the wind turbine generator set.

8. The control method according to claim 7, characterized in that: The control method further includes: In response to the wind turbine generator set running to a stall power point on the blade stall control profile, a current minimum pitch angle of the wind turbine generator set is adjusted to an optimal minimum pitch angle at the stall power point.

9. A control device for a wind turbine generator set, characterized in that: The control device comprises: The pitch angle obtaining unit is configured to: obtain the current minimum pitch angle of the wind turbine generator set; a tip speed ratio deriving unit, configured to: derive a critical stall tip speed ratio of the wind turbine generator set at the current minimum pitch angle from a critical stall tip speed ratio distribution of the wind turbine generator set, wherein the critical stall tip speed ratio distribution includes the critical stall tip speed ratios of the wind turbine generator set at each minimum pitch angle; an operating condition prediction unit, configured to: predict an operating condition of the wind turbine generator set operating at the current minimum pitch angle and the derived critical stall tip speed ratio; a pitch angle adjustment unit, configured to: in response to the operating condition failing to meet the expected performance indicator, adjust the current minimum pitch angle; a pitch angle control unit, configured to: use the adjusted minimum pitch angle to control the operation of the wind turbine generator set; The operating condition is characterized by the output power of the wind turbine generator set operating at the current minimum pitch angle and the derived critical stall tip speed ratio, and the performance indicator is the full power of the wind turbine generator set.

10. The control device according to claim 9, characterized in that: The operating condition prediction unit includes: a critical wind speed calculation unit configured to calculate a critical stall wind speed of the wind turbine generator set at the current minimum pitch angle based on relevant operating parameters of the wind turbine generator set and the derived critical stall tip speed ratio; a power coefficient deriving unit configured to: derive the power coefficient of the wind turbine generator set at the current minimum pitch angle and the derived critical stall tip speed ratio from a power coefficient distribution of the wind turbine generator set, wherein the power coefficient distribution includes the power coefficient of the wind turbine generator set at each tip speed ratio and minimum pitch angle; The output power calculation unit is configured to predict the output power of the wind turbine generator set operating at the current minimum pitch angle and the derived critical stall tip speed ratio based on the derived critical stall wind speed and the derived power coefficient.

11. The control device according to claim 10, characterized in that: The pitch angle adjustment unit is configured as follows: Calculating an equivalent wind speed of the wind turbine generator system based on the predicted output power and the derived power coefficient; Calculating an optimal tip speed ratio of the wind turbine generator set according to relevant operating parameters of the wind turbine generator set and the equivalent wind speed; deriving an optimized minimum pitch angle of the wind turbine generator set at the optimized tip speed ratio from a critical stall tip speed ratio distribution of the wind turbine generator set; deriving the optimized power coefficient of the wind turbine generator set at the optimized minimum pitch angle and the optimized tip speed ratio from the power coefficient distribution of the wind turbine generator set; In response to a difference between the derived optimal power coefficient and the derived power coefficient being less than a predetermined convergence accuracy, the current minimum pitch angle is adjusted to the optimized minimum pitch angle.

12. The control device according to claim 11, characterized in that The pitch angle adjustment unit is further configured to: In response to the difference between the derived optimal power coefficient and the derived power coefficient being greater than a predetermined convergence accuracy, the derived optimal power coefficient is used as the last derived optimal power coefficient, and the steps of calculating the equivalent wind speed, calculating the optimal tip speed ratio, deriving the optimal minimum pitch angle, and deriving the optimal power coefficient are iteratively performed until the difference between the derived optimal power coefficient and the last derived optimal power coefficient is less than the predetermined convergence accuracy; The current minimum pitch angle is adjusted to the optimized minimum pitch angle obtained at the end of the iteration.

13. The control device according to claim 12, characterized in that: The relevant operating parameters of the wind turbine generator set include the generator speed and impeller radius of the wind turbine generator set.

14. The control device according to any one of claims 9 to 13, characterized in that: The control device further comprises: The stall control recording unit is configured to record the predicted output power and the adjusted minimum pitch angle in pairs into a blade stall control table of the wind turbine generator set.

15. The control device according to claim 14, characterized in that: The control device further comprises: The stall control construction unit is configured to: construct a blade stall control distribution of the wind turbine generator set using the blade stall control table, wherein the blade stall control distribution includes an optimal minimum pitch angle at each stall power point of the wind turbine generator set.

16. The control device according to claim 15, characterized in that The control device further comprises: The second pitch angle adjustment unit is configured to: in response to the wind turbine generator set running to the stall power point on the blade stall control distribution, adjust the current minimum pitch angle of the wind turbine generator set to an optimal minimum pitch angle at the stall power point.

17. A computer-readable storage medium storing a computer program, wherein: When the computer program is executed by a processor, the control method for a wind turbine generator set according to any one of claims 1 to 8 is implemented.

18. A computing device comprising: processor; A memory storing a computer program, which, when executed by a processor, implements the control method for a wind turbine generator set according to any one of claims 1 to 8.

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