Method and system for correcting load jump of wind generating set

Abstract

The invention discloses a wind generating set load jump correction method and system, and the method comprises the steps: S1, obtaining the time sequence load data of a fan part; s2, judging whether the time sequence load data is within a preset range or not, judging whether the unit is in a normal power generation working condition or not, and if both are met, entering step S3; s3, calculating an average value and a standard deviation according to the time sequence load data, and performing difference detection to judge whether the jump is single-point jump or multi-point jump; s4, if the jump is single-point jump, the jump value of the jump point is corrected to be the average value of two adjacent points before and after the jump point, and if the jump is multi-point jump, the jump value of each jump point is smoothed to be the sum of the previous point and the standard deviation; and S5, repeatedly executing the steps S3 to S5 until the smoothing effect requirement is met. The method can effectively solve the problems that the sensor signal jumps due to the interference of the internal environment of the fan, the load value is inaccurate, and the safety judgment of the unit is influenced.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbine generator sets, and in particular to a method and system for correcting load jump of wind turbine generator sets. Background Art

[0002] Wind turbines are large and complex mechanical components. To monitor and evaluate the structural health of wind turbines under wind loads and operating loads to ensure the safety, reliability and performance of the system, mechanical load tests are required to identify potential structural problems, fatigue cracks or strain concentration areas, thereby preventing equipment failure or damage. In addition, analysis based on measured data can improve system reliability, reduce downtime and reduce maintenance costs.

[0003] The mechanical load test process generally lasts 3 to 6 months, during which the external conditions such as the fan environment may change greatly, resulting in frequent jumps in sensor signals due to temperature or certain interference conditions during the test, which leads to inaccurate calculations of the corresponding load and invalid test data, delaying the test cycle and increasing test costs. Therefore, it is necessary to reasonably correct the load signal to ensure that the data is authentic and available. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for correcting load jumps of a wind turbine generator set, which can effectively solve the problem that the load signal of the wind turbine jumps due to interference from the internal environment of the wind turbine, resulting in inaccurate load values ​​and affecting the safety judgment of the set.

[0005] Another object of the present invention is to provide a load jump correction system for a wind turbine generator set.

[0006] The purpose of the present invention is achieved through the following technical solutions: A method for correcting load jump of a wind turbine generator set, characterized by comprising: S1, obtaining time series load data of fan components; S2, judging whether the time series load data is within the preset range, judging whether the unit is in normal power generation condition, if all are satisfied, proceeding to step S3; S3, calculating the average value and standard deviation according to the time series load data, and performing differential detection to determine whether it is a single-point jump or a multi-point jump; S4. If it is a single-point jump, the jump value of the jump point is corrected to the average value of the two adjacent points before and after the jump point. If it is a multi-point jump, the jump value of each jump point is smoothed to the sum of the previous point and the standard deviation. S5. Repeat steps S3 to S5 until the smoothing effect requirement is met.

[0007] Further, in step S1, the following operations are specifically performed: The fan component is the blade. A blade root load strain gauge is installed at the root of the blade. The signal of the blade root load strain gauge is connected to the fan data acquisition system for data acquisition. When the wind speed is less than 4m / s, the wind turbine cabin is calibrated by yawing one circle clockwise and counterclockwise. When the wind speed is below 5m / s, the blades are calibrated at idling angles of 0° and 90° respectively. After the calibration is completed, the calculation relationship between the electrical signal and the load is obtained.

[0008] Further, in step S1, the following operations are specifically performed: The wind turbine component is a tower. A tower top load strain gauge and a tower bottom load strain gauge are installed on the top and bottom of the tower respectively. The signals of the tower top load strain gauge and the tower bottom load strain gauge are connected to the wind turbine data acquisition system for data acquisition. When the wind speed is less than 4m / s, the wind turbine cabin is calibrated by yawing one circle clockwise and counterclockwise. When the wind speed is below 5m / s, the wind turbine blades are calibrated at idling angles of 0° and 90° respectively. After the calibration is completed, the calculation relationship between the electrical signal and the load is obtained.

[0009] Further, in step S2, the following operations are specifically performed: The industrial computer system of the wind turbine determines whether the time series load data is within a preset range, and the industrial computer system determines whether the unit is in a normal power generation condition based on the main control data of the wind turbine. If both conditions are met, the process proceeds to step S3.

[0010] Further, in step S3, the following operations are specifically performed: Calculate the average value X and standard deviation S based on the time series load data, and then perform differential detection. If multiple jump points Y appear i >X+3*S and the index of the jump point is not continuous, where i=1, 2, ..., n, then it is identified as a single-point jump. If there are two or more consecutive jumps and the jump point Y i If the number ratio does not exceed the preset ratio of the entire timing number points, it is identified as a multi-point jump.

[0011] Further, in step S4, the following operations are specifically performed: If it is a single-point jump, determine the index position of the jump point in the timing, and then use the smoothing formula Y i =(Y i-1 +Y i+1 ) / 2, for the jump point Y i Correction is performed, where i=1, 2, ..., n, Y i-1 and Y i+1 Respectively represent the jump point Y i Two adjacent points; If it is a multi-point jump, each jump point Y i The jump value of is smoothed to the previous adjacent point Y i-1 and the standard deviation S.

[0012] Another object of the present invention is achieved by the following technical solutions: A load jump correction system for a wind turbine generator set, comprising: A collection module, used for collecting time series load signals of fan components; The fan data acquisition system is used to process the time series load signal into time series load data and transmit it to the industrial computer system; The industrial computer system is used to determine whether the time series load data is within the preset range and whether the unit is in normal power generation conditions. If all are met, the average value and standard deviation are calculated based on the time series load data, and differential detection is performed to determine whether it is a single-point jump or a multi-point jump, and then corrections are made to the jump points.

[0013] Furthermore, the wind turbine component is a blade, and the acquisition module includes a blade root load strain gauge arranged at the root of the blade.

[0014] Furthermore, the wind turbine component is a tower, and the acquisition module includes a top load strain gauge arranged at the top of the tower and a tower bottom load strain gauge arranged at the bottom of the tower.

[0015] Further, the industrial computer system specifically performs the following operations: Determine whether the time series load data is within the preset range, and determine whether the unit is in normal power generation conditions based on the main control data of the wind turbine. If both are satisfied, calculate the average value X and standard deviation S based on the time series load data, and then perform differential detection: If there are multiple jump points Y i >X+3*S and the index of the jump point is discontinuous, where i=1, 2, ..., n, it is identified as a single-point jump, and then the index position of the jump point in the timing is determined, and then according to the smoothing formula Y i =( Y i-1 +Y i+1 ) / 2, for the jump point Y i Correction is performed, where i=1, 2, ..., n, Y i-1 and Y i+1 Respectively represent the jump point Y i Two adjacent points; If there are two or more consecutive jumps and the jump point Y i If the number ratio does not exceed the preset ratio of the total number of points in the time series, it is identified as a multi-point jump, and each jump point Y i The jump value of is smoothed to the previous adjacent point Y i-1 and the sum of the standard deviation S; Repeat differential detection and correction based on the time series load data until the smoothing effect requirements are met.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects: The present invention can classify and process fan load signals according to the jump types that often occur, can effectively remove abnormal components in the signal, thereby improving the clarity and quality of the signal, and can also provide a better signal smoothing effect while maintaining the original characteristics of the signal. The processed signal is more stable and reliable, which helps to improve the accuracy of data processing and analysis, and saves time for on-site data collection and a large amount of manual maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The figure is a flow chart of the method of the present invention.

[0018] Figure 2 A side view of the fan.

[0019] Figure 3 This is the front view of the blade.

[0020] Figure 4 Schematic diagram of blade load jump before filtering.

[0021] Figure 5 This is a schematic diagram of blade load jump filtering. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0023] Embodiment 1: like Figure 1 As shown, this embodiment provides a method for correcting load jump of a wind turbine generator set, comprising the steps of: S1. Obtain the time series load data of the fan components; specifically perform the following operations: The wind turbine component is a blade 1 or a tower 3. When the load jump signal of the blade 1 needs to be corrected, a blade root load strain gauge 6 is installed at the root of the blade, and the signal of the blade root load strain gauge is connected to the wind turbine data acquisition system 7 for data acquisition to obtain the time series load data of the blade; When the load jump signal of the tower 3 needs to be corrected, a tower top load strain gauge 4 and a tower bottom load strain gauge 5 are installed at the top and bottom of the tower respectively, and the signals of the tower top load strain gauge and the tower bottom load strain gauge are connected to the wind turbine data acquisition system 7 for data acquisition to obtain the time series load data of the tower; When the wind speed is less than 4m / s, the wind turbine nacelle 2 is calibrated by yawing clockwise and counterclockwise for 1 circle each, such as Figure 3 As shown, when the wind speed is below 5m / s, the blades are calibrated at idling with pitch angles of 0° and 90°, and after the calibration is completed, the calculation relationship between the electrical signal and the load is obtained; The calculation relationship is written into the industrial computer system 8 for load synthesis, and the output results are monitored in real time and exceptions are handled.

[0024] This embodiment takes the correction of the load jump signal of blade 1 as an example. Figure 2 shown.

[0025] S2, determine whether the time series load data is within the preset range, and determine whether the unit is in normal power generation condition. If all are satisfied, proceed to step S3; perform the following operations specifically: The industrial computer system judges the time series load data transmitted by the wind turbine data acquisition system to determine whether the time series load data is within the preset range, and the industrial computer system determines whether the unit is in normal power generation conditions based on the main control data of the wind turbine. If all are met, it goes to step S3, otherwise it only monitors without processing.

[0026] S3. Under the action of wind load, the blade vibration load value collected in the time sequence when the fan is running can be seen in the industrial computer system to form a load signal similar to a sine wave, such as Figure 4 Calculate the average value and standard deviation based on the time series load data, and perform differential detection to determine whether it is a single-point jump or a multi-point jump; perform the following operations specifically: The industrial computer system calculates the average value X and standard deviation S based on the time series load data, and then performs differential detection. If multiple jump points Y appear i >X+3*S and the index of the jump point is not continuous, where i=1, 2, ..., n, then it is identified as a single-point jump. If there are two or more consecutive jumps and the jump point Y i If the number ratio does not exceed the preset ratio of the total number of timing points (10% in this embodiment), it is identified as a multi-point jump.

[0027] S4. If it is a single-point jump, the jump value of the jump point is corrected to the average value of the two adjacent points before and after the jump point. If it is a multi-point jump, the jump value of each jump point is smoothed to the sum of the previous point and the standard deviation. Specifically, the following operations are performed: If it is a single-point jump, determine the index position of the jump point in the timing, and then use the smoothing formula Y i =(Y i-1 +Y i+1 ) / 2, for the jump point Y i Make corrections, Y i-1 and Y i+1 Respectively represent the jump point Y i The curve obtained after filtering of two adjacent points is as follows Figure 5 As shown, the signal is repaired while maintaining its original characteristics; If it is a multi-point jump, each jump point Y i The jump value of is smoothed to the previous adjacent point Y i-1 and the standard deviation S.

[0028] S5. Repeat steps S3 to S5 until the smoothing effect requirement is met.

[0029] Embodiment 2: This embodiment provides a wind turbine generator set load jump correction system, including: The acquisition module is used to acquire the time-series load signals of the wind turbine components; wherein the wind turbine components are blades or towers. When the wind turbine components are blades, the system corrects the blade load jump signal; when the wind turbine components are towers, the system corrects the tower load jump signal; when the blade load jump signal is corrected, a blade root load strain gauge is installed at the root of the blade; when the tower load jump signal is corrected, a top load strain gauge is set at the top of the tower and a tower bottom load strain gauge is set at the bottom of the tower.

[0030] The fan data acquisition system is used to process the time series load signal into time series load data and transmit it to the industrial computer system.

[0031] The industrial computer system is used to determine whether the time series load data is within the preset range and whether the unit is in normal power generation conditions. If all are satisfied, the average value and standard deviation are calculated according to the time series load data, and differential detection is performed to determine whether it is a single-point jump or a multi-point jump, and then the jump point is corrected; the following operations are performed specifically, Determine whether the time series load data is within the preset range, and determine whether the unit is in normal power generation conditions based on the main control data of the wind turbine. If both are satisfied, calculate the average value X and standard deviation S based on the time series load data, and then perform differential detection: If there are multiple jump points Y i >X+3*S and the index of the jump point is discontinuous, where i=1, 2, ..., n, it is identified as a single-point jump, and then the index position of the jump point in the timing is determined, and then according to the smoothing formula Y i =( Yi-1 +Y i+1 ) / 2, for the jump point Y i Correction is performed, where i=1, 2, ..., n, Y i-1 and Y i+1 Respectively represent the jump point Y i Two adjacent points; If there are two or more consecutive jumps and the jump point Y i If the number ratio does not exceed the preset ratio of the total number of points in the time series, it is identified as a multi-point jump, and each jump point Y i The jump value of is smoothed to the previous adjacent point Y i-1 and the sum of the standard deviation S; Repeat differential detection and correction based on the time series load data until the smoothing effect requirements are met.

[0032] The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and invention concept of the present invention within the scope disclosed by the present invention, which shall fall within the protection scope of the present invention.

Claims

1. A method for correcting load jump of a wind turbine generator set, characterized in that: include, S1, obtaining time series load data of fan components; S2, judging whether the time series load data is within the preset range, judging whether the unit is in normal power generation condition, if all are satisfied, proceeding to step S3; S3, calculating the average value and standard deviation according to the time series load data, and performing differential detection to determine whether it is a single-point jump or a multi-point jump; S4. If it is a single-point jump, the jump value of the jump point is corrected to the average value of the two adjacent points before and after the jump point. If it is a multi-point jump, the jump value of each jump point is smoothed to the sum of the previous point and the standard deviation. S5. Repeat steps S3 to S5 until the smoothing effect requirement is met.

2. The method for correcting load jump of a wind turbine generator set according to claim 1, characterized in that: In step S1, the following operations are specifically performed: The fan component is the blade. A blade root load strain gauge is installed at the root of the blade. The signal of the blade root load strain gauge is connected to the fan data acquisition system for data acquisition. When the wind speed is less than 4m / s, the wind turbine cabin is calibrated by yawing one circle clockwise and counterclockwise. When the wind speed is below 5m / s, the blades are calibrated at idling angles of 0° and 90° respectively. After the calibration is completed, the calculation relationship between the electrical signal and the load is obtained.

3. The method for correcting load jump of a wind turbine generator set according to claim 1, characterized in that: In step S1, the following operations are specifically performed: The wind turbine component is a tower. A tower top load strain gauge and a tower bottom load strain gauge are installed on the top and bottom of the tower respectively. The signals of the tower top load strain gauge and the tower bottom load strain gauge are connected to the wind turbine data acquisition system for data acquisition. When the wind speed is less than 4m / s, the wind turbine cabin is calibrated by yawing one circle clockwise and counterclockwise. When the wind speed is below 5m / s, the wind turbine blades are calibrated at idling angles of 0° and 90° respectively. After the calibration is completed, the calculation relationship between the electrical signal and the load is obtained.

4. The method for correcting load jump of a wind turbine generator set according to claim 1, characterized in that: In step S2, the following operations are specifically performed: The industrial computer system of the wind turbine determines whether the time series load data is within a preset range, and the industrial computer system determines whether the unit is in a normal power generation condition based on the main control data of the wind turbine. If both conditions are met, the process proceeds to step S3.

5. The method for correcting load jump of a wind turbine generator set according to claim 1, characterized in that: In step S3, the following operations are specifically performed: Calculate the average value X and standard deviation S based on the time series load data, and then perform differential detection. If multiple jump points Y appear i >X+3*S and the index of the jump point is not continuous, where i=1, 2, ..., n, then it is identified as a single-point jump. If there are two or more consecutive jumps and the jump point Y i If the number ratio does not exceed the preset ratio of the entire timing number points, it is identified as a multi-point jump.

6. The method for correcting load jump of a wind turbine generator set according to claim 1, characterized in that: In step S4, the following operations are specifically performed: If it is a single-point jump, determine the index position of the jump point in the timing, and then use the smoothing formula Y i =( Y i-1 +Y i+1 ) / 2, for the jump point Y i Correction is performed, where i=1, 2, ..., n, Y i-1 and Y i+1 Respectively represent the jump point Y i Two adjacent points; If it is a multi-point jump, each jump point Y i The jump value of is smoothed to the previous adjacent point Y i-1 and the standard deviation S.

7. A load jump correction system for a wind turbine generator set, characterized in that: include, A collection module, used for collecting time series load signals of fan components; The fan data acquisition system is used to process the time series load signal into time series load data and transmit it to the industrial computer system; The industrial computer system is used to determine whether the time series load data is within the preset range and whether the unit is in normal power generation conditions. If all are met, the average value and standard deviation are calculated based on the time series load data, and differential detection is performed to determine whether it is a single-point jump or a multi-point jump, and then corrections are made to the jump points.

8. The method for correcting load jump of a wind turbine generator set according to claim 7, characterized in that: The fan component is a blade, and the acquisition module includes a blade root load strain gauge arranged at the root of the blade.

9. The method for correcting load jump of a wind turbine generator set according to claim 7, characterized in that: The wind turbine component is a tower, and the acquisition module includes a top load strain gauge arranged at the top of the tower and a tower bottom load strain gauge arranged at the bottom of the tower.

10. The method for correcting load jump of a wind turbine generator set according to claim 7, characterized in that: The industrial computer system specifically performs the following operations: Determine whether the time series load data is within the preset range, and determine whether the unit is in normal power generation conditions based on the main control data of the wind turbine. If both are satisfied, calculate the average value X and standard deviation S based on the time series load data, and then perform differential detection: If there are multiple jump points Y i > X+3*S and the index of the jump point is discontinuous, where i=1, 2, ..., n, it is identified as a single-point jump, and then the index position of the jump point in the timing is determined, and then according to the smoothing formula Y i =( Y i-1 +Y i+1 ) / 2, for the jump point Y i Correction is performed, where i=1, 2, ..., n, Y i-1 and Y i+1 Respectively represent the jump point Y i Two adjacent points; If there are two or more consecutive jumps and the jump point Y i If the number ratio does not exceed the preset ratio of the total number of points in the time series, it is identified as a multi-point jump, and each jump point Y i The jump value of is smoothed to the previous adjacent point Y i-1 and the sum of the standard deviation S; Repeat differential detection and correction based on the time series load data until the smoothing effect requirements are met.

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