Temperature detection method of gearbox transmission shaft, controller and wind generating set

Abstract

The invention discloses a gearbox transmission shaft temperature detection method, a controller and a wind generating set, a transmission shaft comprises a high-speed shaft and a low-speed shaft, the high-speed shaft is connected to a generator, and the low-speed shaft is connected to a wind wheel hub. And a temperature variation on the low-speed shaft side; obtaining a first temperature variation ratio according to the temperature variation of the high-speed shaft side and the temperature variation of the low-speed shaft side; and in response to the condition that the first temperature variation ratio is within the preset friction heat ratio range, determining that the temperatures of the high-speed shaft side and the low-speed shaft side are normal. By adopting the embodiment of the invention, the temperature detection result can be prevented from being influenced by wrong data of the temperature sensor, and the temperature rise change condition of the high-speed shaft side can be accurately reflected.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and particularly to a temperature detection method, a controller and a wind turbine generator set for a gearbox transmission shaft. Background Art

[0002] The gearbox is an important mechanical component of a wind turbine generator set. Its main function is to transmit the mechanical power generated by the wind turbine under the action of wind to the generator to obtain the corresponding rotational speed. During the long-term operation of the wind turbine generator set, the gearbox will generate a temperature rise. Due to the lubrication of the gear oil inside the gearbox, its temperature rise is generally within the normal range; the high-speed shaft outside the gearbox has a high temperature rise due to its high rotational speed. Excessive temperature will seriously affect the service life of mechanical components, and may even cause mechanical damage such as cracks and fractures in mechanical components, affecting the safety of the wind turbine generator set. Therefore, it is very necessary to detect the temperature signal of the rotating shaft of the gearbox, especially the high-speed shaft.

[0003] Currently, the temperature rise change of the high-speed shaft during the test of the wind turbine generator set is mainly detected by installing a temperature sensor at the position where the high-speed shaft is located. However, affected by the ambient temperature, the accuracy of the temperature sensor and the rotational speed, the temperature data detected by the temperature sensor may be inaccurate and cannot accurately reflect the temperature rise change of the high-speed shaft. Summary of the Invention

[0004] Embodiments of the present invention provide a temperature detection method, a controller and a wind turbine generator set for a gearbox transmission shaft, which can avoid the influence of incorrect data of the temperature sensor on the temperature detection result and accurately reflect the temperature rise change of the high-speed shaft side.

[0005] In a first aspect, an embodiment of the present invention provides a temperature detection method for a gearbox transmission shaft. The transmission shaft includes a high-speed shaft and a low-speed shaft. The high-speed shaft is connected to the generator, and the low-speed shaft is connected to the wind turbine hub. The temperature detection method includes:

[0006] Obtain the temperature change amount on the high-speed shaft side and the temperature change amount on the low-speed shaft side during the operation of the wind turbine generator set;

[0007] Obtain a first temperature change amount ratio according to the temperature change amount on the high-speed shaft side and the temperature change amount on the low-speed shaft side;

[0008] In response to the first temperature change amount ratio being within a preset friction heat ratio range, determine that the temperatures on both the high-speed shaft side and the low-speed shaft side are normal.

[0009] In a possible implementation manner of the first aspect, the temperature detection method further includes: in response to the first temperature change amount ratio being less than the lower limit of the friction heat ratio range, determine that the temperature on the low-speed shaft side is abnormal.

[0010] In a possible implementation manner of the first aspect, a plurality of temperature sensors are arranged on the high-speed shaft side, and the first temperature change amount is calculated based on the measured temperature of the first temperature sensor on the high-speed shaft side; the temperature detection method further includes: in response to the first temperature change amount ratio being greater than the upper limit of the friction heat ratio range, obtaining the measured temperatures of the second temperature sensor on the high-speed shaft side at the start time and the end time of the operation of the wind turbine generator; calculating the difference between the measured temperatures of the second temperature sensor at the end time and the start time of the operation of the wind turbine generator, to obtain the high-speed shaft side temperature change amount corresponding to the second temperature sensor; according to the high-speed shaft side temperature change amount corresponding to the second temperature sensor and the temperature change amount of the low-speed shaft side, obtaining the second temperature change amount ratio; in response to the second temperature change amount ratio being within the friction heat ratio range, determining that the temperature of the high-speed shaft side is normal, and determining that the first temperature sensor itself has a data anomaly fault.

[0011] In a possible implementation manner of the first aspect, the temperature detection method further includes: in response to the second temperature change amount ratio being greater than the upper limit of the friction heat ratio range, obtaining the measured temperatures of the third temperature sensor on the high-speed shaft side at the start time and the end time of the operation of the wind turbine generator; calculating the difference between the measured temperatures of the third temperature sensor at the end time and the start time of the operation of the wind turbine generator, to obtain the high-speed shaft side temperature change amount corresponding to the third temperature sensor; according to the high-speed shaft side temperature change amount corresponding to the third temperature sensor and the temperature change amount of the low-speed shaft side, obtaining the third temperature change amount ratio; in response to the third temperature change amount ratio being within the friction heat ratio range, determining that the temperature of the high-speed shaft side is normal, and determining that the first temperature sensor and the second temperature sensor itself have data anomaly faults.

[0012] In a possible implementation manner of the first aspect, the first temperature sensor is installed at one of the following positions: the motor side of the high-speed shaft, the blade side, and the three-stage turntable of the gearbox.

[0013] In a possible implementation manner of the first aspect, the first temperature sensor includes a thermocouple temperature sensor and / or a thermal resistance temperature sensor.

[0014] In a possible implementation manner of the first aspect, the temperature detection method further includes: obtaining the friction heat ratio of the high-speed shaft side and the low-speed shaft side; shifting the friction heat ratio upward by a preset ratio to obtain the upper limit of the friction heat ratio range; shifting the friction heat ratio downward by a preset ratio to obtain the lower limit of the friction heat ratio range; wherein, the preset ratio is less than or equal to 10%.

[0015] In a possible implementation of the first aspect, the temperature change amounts on the high-speed shaft side and the low-speed shaft side during the operation of the wind turbine generator set include: obtaining the temperature change amounts on the high-speed shaft side and the low-speed shaft side during the on-site operation or the drag test operation of the wind turbine generator set.

[0016] In a second aspect, an embodiment of the present invention provides a controller, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the temperature detection method of the gearbox transmission shaft in any one of the above.

[0017] In a third aspect, an embodiment of the present invention provides a computer-readable storage medium, which stores computer instructions for causing a computer to execute the temperature detection method of the gearbox transmission shaft in any one of the above.

[0018] In a fourth aspect, an embodiment of the present invention provides a wind turbine generator set, which includes: a gearbox, a generator, a hub, and the controller as described above. The low-speed shaft of the gearbox is connected to the hub, and the high-speed shaft is connected to the generator. The controller is configured to execute the temperature detection method in any one of the above.

[0019] As described above, in the temperature detection method of the gearbox transmission shaft in the embodiment of the present invention, first, the temperature change amounts on the high-speed shaft side and the low-speed shaft side during the operation of the wind turbine generator set are obtained; then, according to the temperature change amounts on the high-speed shaft side and the low-speed shaft side, a first temperature change amount ratio is obtained; finally, if the first temperature change amount ratio is within a preset frictional heat ratio range, it is determined that the temperatures on both the high-speed shaft side and the low-speed shaft side are normal.

[0020] Since the embodiment of the present invention comprehensively considers the temperature rise change conditions on the high-speed shaft side and the low-speed shaft side and the transmission ratio, and realizes the detection of the temperature rise change conditions on the high-speed shaft side and the low-speed shaft side based on the feature that the temperature change amounts on the high-speed shaft side and the low-speed shaft side are approximately equal to the frictional heat ratio on the high-speed shaft side and the low-speed shaft side. Compared with the single detection of the temperature on the high-speed shaft side or the low-speed shaft side, this method is not easily affected by the ambient temperature, the accuracy of the temperature sensor, the rotation speed, and the drag duration, and can complete the temperature detection under any circumstances, having the advantages of high detection accuracy and wide application range, and is of great significance for improving the quality and efficiency of factory inspection and the safety of on-site operation.

[0021] In addition, the temperature detection method of the gearbox transmission shaft of the wind turbine generator set in the embodiment of the present invention also has the advantages of simple operation and reliable results, which is conducive to realizing the intellectualization and automation of the gearbox transmission shaft of the wind turbine generator set. Description of the Drawings

[0022] The present invention can be better understood from the following description of the specific embodiments in conjunction with the accompanying drawings, wherein the same or similar reference numerals denote the same or similar features.

[0023] Figure 1 FIG. is a schematic structural diagram of a gearbox provided by an embodiment of the present invention;

[0024] Figure 2 FIG. is a flowchart of a method for detecting the temperature of a transmission shaft of a gearbox provided by an embodiment of the present invention;

[0025] Figure 3 FIG. is a flowchart of a method for detecting the temperature of a transmission shaft of a gearbox provided by another embodiment of the present invention;

[0026] Figure 4 FIG. is a flowchart of a method for detecting the temperature of a transmission shaft of a gearbox provided by still another embodiment of the present invention;

[0027] Figure 5 FIG. is a flowchart of a method for detecting the temperature of a transmission shaft of a gearbox provided by yet another embodiment of the present invention.

[0028] Description of the Reference Numerals:

[0029] 10 - High-speed shaft; 20 - Low-speed shaft. Detailed Embodiments

[0030] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a comprehensive understanding of the present invention.

[0031] Figure 1 The structure of the gearbox of a wind turbine is shown. The transmission shaft extending axially out of the gearbox includes a high-speed shaft 10 and a low-speed shaft 20. The radius of the high-speed shaft 10 is much larger than that of the low-speed shaft. The high-speed shaft 10 is connected to a generator (not shown in the figure) and is the gearbox shaft on the side of the generator, that is, the output shaft of the gearbox; the low-speed shaft 20 is connected to a wind turbine hub (not shown in the figure) and is the gearbox shaft on the side of the impeller, that is, the output shaft of the gearbox.

[0032] During the on-site test operation of the wind turbine, the wind energy drives the impeller to rotate, and then drives the low-speed shaft to rotate. After being speeded up by the gearbox in the gearbox, it is transmitted to the high-speed shaft, and finally drives the moving coil of the generator to rotate.

[0033] During the drag test operation of the wind turbine, the frequency converter increases the voltage for the generator winding coil. Under the action of electromagnetic induction, the moving coil of the generator starts to rotate, and then drives the high-speed shaft to rotate. After being decelerated by the gearbox in the gearbox, it is transmitted to the low-speed shaft.

[0034] Both the high-speed shaft and the low-speed shaft have bearing support structures, and the rotations of the high-speed shaft and the low-speed shaft are synchronous. When the high-speed shaft and the low-speed shaft rotate, they will rub against the corresponding bases, resulting in temperature rise.

[0035] From the above analysis, it can be seen that there is a certain relationship between the temperature rise changes of the high-speed shaft and the low-speed shaft and the transmission ratio. Based on this principle, the detection of the temperature rise changes of the transmission shaft of the gearbox can be realized. The following is an explanation of the formula derivation process of the relationship between the temperature rise changes of the high-speed shaft and the low-speed shaft and the transmission ratio:

[0036] First, considering that the heat generation method of the rotating structure mainly includes heat generation by friction, the heat Q + is expressed as:

[0037] Q + = N×v×t (1)

[0038] N = F×R (2)

[0039] Second, considering that the heat dissipation method of the rotating structure mainly includes the heat being carried away by circulating oil (cooling medium), this process is related to the speed of rotation. The dissipated heat Q - is expressed as:

[0040] Q - = p×v×t (3)

[0041] Among them, N represents the frictional torque, v represents the mechanical rotation speed, t represents the rotation operation duration, ρ represents the heat dissipation coefficient, F represents the frictional force, and R represents the rotation radius.

[0042] Next, according to the physical definition, the heat expression based on the temperature change amount can be obtained as:

[0043] Q = C×M×ΔT (4)

[0044] Among them, C represents the specific heat, M represents the mass, and ΔT represents the temperature change amount.

[0045] Let the rotation speed on the high-speed shaft side be v1, the rotation speed of the low-speed shaft be v2, the transmission ratio of the gearbox be n, n = v1 / v2, the frictional torque on the high-speed shaft side be N1, the frictional torque on the low-speed shaft side be N2, the temperature change amount on the high-speed shaft side be ΔT1, the temperature change amount on the low-speed shaft side be ΔT2, the heat dissipation coefficient on the high-speed shaft side be ρ1, the heat dissipation coefficient on the low-speed shaft side be ρ2, R1 represents the rotation radius of the high-speed shaft, and R2 represents the rotation radius of the low-speed shaft, F1 represents the frictional force of the high-speed shaft, and F2 represents the frictional force of the low-speed shaft.

[0046] Combining formulas (1)-(4), we can get:

[0047] The expression for the heat generated by the high-speed shaft is:

[0048] F1R1v1t - ρ1v1t = CMΔT1 (5)

[0049] The expression for the heat generated by the low-speed shaft is:

[0050] F2R2v2t - ρ2v2t = CMΔT2 (6)

[0051] Taking the ratio of the heat generated by the high-speed shaft and the low-speed shaft, we can obtain:

[0052]

[0053] Considering that the gearbox can be regarded as an integral structure with the centroid located in the middle, and the high-speed shaft and the low-speed shaft evenly bear the weight of the gearbox, so the pressures on both sides of the shaft are the same, and the friction coefficients are the same, that is, the frictional forces are basically the same, and F1 is approximately equal to F2.

[0054] Also considering that calculating the bearing heat dissipation coefficients ρ1 and ρ2 requires parameters such as bearing friction power, bearing surface temperature, and bearing heat dissipation area, the reference value of the calculation result is 1.67×10 -5 , which is much smaller than the values of R1 and R2. In addition, since the gearbox is an integral and single-material structure, its specific heat capacity is the same, that is, the heat dissipation conditions are also basically the same, and ρ1 is approximately equal to ρ2.

[0055] Therefore, formula (7) can be approximately simplified to:

[0056]

[0057] In formula (8), the high-speed shaft radius R1, the low-speed shaft radius R2, and the transmission ratio n are constant values. That is to say, the ratio of the temperature change ΔT1 of the high-speed shaft and the temperature change ΔT2 of the low-speed shaft is a constant, approximately equal to the ratio of the frictional heat of the high-speed shaft side and the low-speed shaft side.

[0058] Based on this feature, the embodiment of the present invention provides a method for detecting the temperature of the transmission shaft of a gearbox. As Figure 2 shown, this temperature detection method includes: step S201 to step S203.

[0059] Step S201, obtain the temperature change of the high-speed shaft side and the temperature change of the low-speed shaft side during the operation of the wind turbine generator;

[0060] Step S202, obtain the first temperature change ratio according to the temperature change of the high-speed shaft side and the temperature change of the low-speed shaft side;

[0061] Step S203: When the ratio of the first temperature change amount is within the preset friction heat ratio range, it is determined that the temperatures on both the high-speed shaft side and the low-speed shaft side are normal.

[0062] In this step, if the ratio of the first temperature change amount is within the preset friction heat ratio range, it indicates that the temperature change trends on both the high-speed shaft side and the low-speed shaft side are consistent, and there is no abnormally high relative temperature signal on the high-speed shaft side, nor is there an abnormally high relative temperature signal on the low-speed shaft side. Therefore, it can be determined that the temperatures on both the high-speed shaft side and the low-speed shaft side are normal.

[0063] Conversely, if the ratio of the first temperature change amount is less than the lower limit of the friction heat ratio range, it indicates that the temperature signal on the low-speed shaft side, which is in the denominator position, is abnormally high, and it can be determined that the temperature on the low-speed shaft side is abnormal.

[0064] Exemplarily, the upper limit of the friction heat ratio range can be obtained by shifting the friction heat ratio calculated according to formula (8) upward by a preset ratio; the lower limit of the friction heat ratio range can be obtained by shifting the friction heat ratio downward by a preset ratio; where the preset ratio can be less than or equal to 10% to leave an appropriate safety detection margin.

[0065] The temperature detection method for the transmission shaft of the gearbox of the wind turbine generator set in the embodiment of the present invention is applicable to the temperature detection of the transmission shaft of the gearbox during the drag test or on-site test.

[0066] For the convenience of those skilled in the art to understand, the following combines Figure 3 to give an example of the temperature detection method in the embodiment of the present invention.

[0067] Figure 3 The temperature detection process shown in

[0068] Step S301: Start the drag operation or on-site operation of the wind turbine generator set.

[0069] Step S302: Record the starting temperature values of the high-speed shaft and the low-speed shaft.

[0070] Step S303: The operation duration reaches or the drag ends.

[0071] Step S304: Record the ending temperature values of the high-speed shaft and the low-speed shaft, and calculate the ratio b1 of the temperature change amounts of the high-speed shaft and the low-speed shaft.

[0072] Step S305: Calculate or read the upper limit b2 and the lower limit b3 of the friction heat ratio of the high-speed shaft and the low-speed shaft according to formula (8).

[0073] Step S306: Determine whether b1, b2, and b3 satisfy the relational expression: b3 ≤ b1 ≤ b2. If so, execute Step S307; otherwise, execute Step S308.

[0074] Step S307: Determine that the temperatures of the high-speed shaft and the low-speed shaft are normal.

[0075] Step S308: Determine whether b1 is greater than b2. If so, execute Step S309; otherwise, execute Step S310.

[0076] Step S309: Determine that the temperature on the high-speed shaft side is abnormal.

[0077] Step S310: Determine whether the calculated temperature change ratio is less than the difference between the friction heat ratio constant and the preset allowable deviation. If so, execute Step S311; otherwise, end the process.

[0078] Step S311: Determine that the temperature on the low-speed shaft side is abnormal.

[0079] As described above, in the temperature detection method for the transmission shaft of the gearbox of the wind turbine generator set in the embodiment of the present invention, first, obtain the temperature change amount on the high-speed shaft side and the temperature change amount on the low-speed shaft side during the operation of the wind turbine generator set; then, according to the temperature change amount on the high-speed shaft side and the temperature change amount on the low-speed shaft side, obtain the first temperature change ratio; finally, if the first temperature change ratio is within the preset friction heat ratio range, determine that the temperatures of the high-speed shaft side and the low-speed shaft side are both normal.

[0080] Since the embodiment of the present invention comprehensively considers the temperature rise change conditions on the high-speed shaft side and the low-speed shaft side in combination with the transmission ratio, and based on the feature that the temperature change amounts on the high-speed shaft side and the low-speed shaft side are approximately equal to the friction heat ratio on the high-speed shaft side and the low-speed shaft side, to realize the detection of the temperature rise change conditions on the high-speed shaft side and the low-speed shaft side. Compared with the method of detecting only the temperature on the high-speed shaft side or the low-speed shaft side, this method is not easily affected by the ambient temperature, the accuracy of the temperature sensor, the rotation speed, and the driving duration, and can complete the temperature detection under any circumstances, having the advantages of high detection accuracy and wide application range, and is of great significance for improving the quality and efficiency of factory inspection and the safety of on-site operation.

[0081] In addition, the temperature detection method for the transmission shaft of the gearbox in the embodiment of the present invention also has the advantages of simple operation and reliable results, which is conducive to realizing the intellectualization and automation of the transmission shaft of the gearbox.

[0082] Generally, considering that the rotation speed on the high-speed shaft side is relatively high and the temperature rise change condition is relatively severe, multiple temperature sensors can be arranged on the high-speed shaft side. For example, temperature sensors are respectively arranged at positions adjacent to the high-speed shaft such as the motor side, the blade side of the high-speed shaft, and the three-stage carrier of the gearbox, for realizing the comparative detection of the temperature rise change condition on the high-speed shaft side.

[0083] In an embodiment of the present invention, the first temperature change amount in step S202 and step S203 can be calculated based on the measured temperature of the first temperature sensor on the high-speed shaft side. Exemplarily, the first temperature sensor can be installed at one of the following positions: the motor side of the high-speed shaft, the blade side, and the three-stage carrier of the gearbox. Exemplarily, the first temperature sensor can include a thermocouple temperature sensor and / or a thermal resistance temperature sensor.

[0084] If the ratio of the first temperature change amount is greater than the upper limit of the friction heat ratio range, it indicates that the temperature signal on the high-speed shaft side at the molecular position is abnormally high. Considering the actual installation and use of the first temperature sensor, for example, when the first temperature sensor is a thermocouple temperature sensor, the positive and negative poles may be connected reversely, or when the first temperature sensor is a thermal resistance temperature sensor, the temperature data is easily affected by the installation distance, both of which will cause the measured temperature data of the first temperature sensor to be inaccurate, and further cause the temperature signal on the high-speed shaft side to be abnormally high.

[0085] Therefore, when the ratio of the first temperature change amount is greater than the upper limit of the friction heat ratio range, it is possible to first determine whether the first temperature sensor itself has a data anomaly fault. After excluding the case where the first temperature sensor itself has a data anomaly fault, it is possible to determine the temperature anomaly on the high-speed shaft side, thereby improving the accuracy of the temperature detection result on the high-speed shaft side.

[0086] Therefore, the embodiment of the present invention also provides a temperature detection method for the transmission shaft of a gearbox. Refer to Figure 4 , Figure 4 And Figure 2 The difference is that after step 202 in Figure 2 ,it further includes Figure 4 Steps S204 to S207 in

[0087] Step S204, if the ratio of the first temperature change amount is greater than the upper limit of the friction heat ratio range, obtain the measured temperatures of the second temperature sensor on the high-speed shaft side at the start time and end time of the operation of the wind turbine generator;

[0088] Step S205, calculate the difference between the temperatures measured by the second temperature sensor at the end time and start time of the operation of the wind turbine generator to obtain the temperature change amount on the high-speed shaft side corresponding to the second temperature sensor;

[0089] Step S206, according to the temperature change amount on the high-speed shaft side corresponding to the second temperature sensor and the temperature change amount on the low-speed shaft side, obtain the ratio of the second temperature change amount;

[0090] Step S207: If the ratio of the second temperature change amount is within the range of the friction heat ratio, determine that the temperature on the high-speed shaft side is normal and determine that the first temperature sensor itself has a data anomaly fault.

[0091] In this embodiment, since the ratio of the second temperature change amount is within the range of the friction heat ratio, it indicates that the temperature change trends on the high-speed shaft side and the low-speed shaft side obtained based on the second temperature sensor are consistent, there is no relatively high anomaly in the temperature signal on the high-speed shaft side, and there is no relatively high anomaly in the temperature signal on the low-speed shaft side either. Therefore, it can be determined that the temperatures on both the high-speed shaft side and the low-speed shaft side are normal.

[0092] Meanwhile, considering that the ratio of the first temperature change amount being greater than the upper limit of the friction heat ratio range in step S204 is caused by a data anomaly fault of the first temperature sensor itself, it can be determined that the first temperature sensor itself has a data anomaly fault, and the fault prompt information is returned to the control center in a timely manner, enabling the staff to discover problems, eliminate faults, and potential safety hazards at an early stage.

[0093] On the contrary, if the ratio of the second temperature change amount is greater than the upper limit of the friction heat ratio range, it indicates that there is also a relatively high anomaly in the temperature signal on the high-speed shaft side at the molecular position. In this case, considering the actual installation and use conditions of the second temperature sensor, for example, when the second temperature sensor is a thermocouple temperature sensor, the positive and negative poles may be connected reversely, or when the second temperature sensor is a thermal resistance temperature sensor, the temperature data is easily affected by the installation distance, which will cause the measured temperature data of the second temperature sensor to be inaccurate, and further result in a relatively high anomaly in the temperature signal on the high-speed shaft side.

[0094] Therefore, the embodiment of the present invention further provides a temperature detection method for the transmission shaft of a gearbox. Refer to Figure 5 , Figure 5 And Figure 4 is different in that after step 206 in Figure 4 , it further includes Figure 5 Steps S208 to S211 in

[0095] Step S208: If the ratio of the second temperature change amount is greater than the upper limit of the friction heat ratio range, obtain the measured temperatures of the third temperature sensor on the high-speed shaft side at the start and end times of the operation of the wind turbine generator;

[0096] Step S209: Calculate the difference between the measured temperatures of the third temperature sensor at the end and the start of the operation of the wind turbine generator set to obtain the temperature change amount on the high-speed shaft side corresponding to the third temperature sensor;

[0097] Step S210: Obtain the third temperature change ratio based on the temperature change amount on the high-speed shaft side corresponding to the third temperature sensor and the temperature change amount on the low-speed shaft side;

[0098] Step S211: If the third temperature change ratio is within the friction heat ratio range, determine that the temperature on the high-speed shaft side is normal and determine that data abnormal faults occur in the first temperature sensor and the second temperature sensor themselves.

[0099] In this embodiment, the third temperature change ratio being within the friction heat ratio range indicates that the temperature change trends on the high-speed shaft side and the low-speed shaft side obtained based on the third temperature sensor are consistent, there is no relatively high abnormal temperature signal on the high-speed shaft side, and there is also no relatively high abnormal temperature signal on the low-speed shaft side. Therefore, it can be determined that the temperatures on both the high-speed shaft side and the low-speed shaft side are normal.

[0100] At the same time, considering that the second temperature change ratio in step S208 being greater than the upper limit of the friction heat ratio range is caused by a data abnormal fault in the second temperature sensor itself, it can be determined that data abnormal faults occur in the first temperature sensor and the second temperature sensor themselves, and the fault prompt information is returned to the control center in a timely manner so that the staff can discover problems, eliminate faults and potential safety hazards early.

[0101] Similarly, if the third temperature change ratio is also greater than the upper limit of the friction heat ratio range, it indicates that the temperature detection results of at least three temperature sensors on the high-speed shaft side are consistent. In this way, it is possible to rule out data abnormal faults in the temperature sensors themselves, and thus it can be determined that the temperature on the high-speed shaft side has a relatively high abnormality, and the abnormal information is prompted to the staff so that the staff can discover problems, eliminate faults and potential safety hazards early.

[0102] For the convenience of those skilled in the art to understand, the following uses Table 1 to Figure 4 and Figure 5 give an example of the temperature detection method for the transmission shaft of the gearbox of the wind turbine generator set in

[0103] Table 1 shows the measurement data of the temperature sensors at the inner ring of the rear bearing of the low-speed shaft, the blade side of the high-speed shaft, and the position of the three-stage carrier of the gearbox during the operation of the wind turbine generator set.

[0104] Table 1

[0105]

[0106] Among them, the temperature of the inner ring of the rear bearing of the low-speed shaft rises from 31.9 °C to 33.9 °C, and the temperature change is 2.8 °C; the temperature on the blade side of the high-speed shaft rises from 39.0 °C to 57.2 °C, and the temperature change is 18.2 °C; the temperature of the third-stage carrier of the gearbox rises from 25 °C to 46.7 °C, and the temperature change is 21.7 °C.

[0107] The actual working condition is that the temperature sensor at the position of the third-stage carrier of the gearbox is a thermocouple, and the positive and negative poles are connected reversely by the manufacturer, resulting in a large difference in its temperature value compared with the "temperature of the high-speed shaft of the gearbox" and the "temperature of the blade of the high-speed shaft of the gearbox".

[0108] According to the temperature detection method of the embodiment of the present invention, based on the temperature change of the third-stage carrier of the gearbox and the temperature change of the inner ring of the rear bearing of the low-speed shaft, the ratio of the temperature change of the high-speed shaft side to the low-speed shaft side can be calculated as 21.7 / 2.8 = 7.75; based on the temperature change of the blade side of the high-speed shaft and the temperature change of the inner ring of the rear bearing of the low-speed shaft, the ratio of the temperature change of the high-speed shaft side to the low-speed shaft side is calculated as 18.2 / 2.8 = 6.5.

[0109] It is also known that the total transmission ratio of the gearbox is 73.69, the radius of the high-speed shaft is 0.05 m, and the radius of the low-speed shaft is 0.57 m. According to formula (8), the ratio of the frictional heat of the high-speed shaft side to the low-speed shaft side is calculated as the constant 73.69×0.05 / 0.57 = 6.464.

[0110] It can be seen that under the same working conditions, the ratio of the temperature change of the high-speed shaft side to the low-speed shaft side calculated based on the temperature change of the blade side of the high-speed shaft and the temperature change of the inner ring of the rear bearing of the low-speed shaft is approximately equal to the constant of the frictional heat ratio, while the ratio of the temperature change of the high-speed shaft side to the low-speed shaft side calculated based on the temperature change of the third-stage carrier of the gearbox and the temperature change of the inner ring of the rear bearing of the low-speed shaft is much larger than the constant of the frictional heat ratio.

[0111] Therefore, it can be determined that the temperature of the high-speed shaft side is normal, and it is determined that the temperature sensor at the position of the third-stage carrier of the gearbox has a data abnormality fault by itself. The detection result completely conforms to the actual working condition, indicating that the temperature detection method in the embodiment of the present invention is reliable.

[0112] The embodiment of the present invention also provides a controller, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the temperature detection method of the gearbox transmission shaft as described in any one of the above.

[0113] An embodiment of the present invention further provides a computer-readable storage medium storing computer instructions for causing a computer to execute the temperature detection method of the gearbox transmission shaft according to any one of the above.

[0114] An embodiment of the present invention further provides a wind turbine generator set, which includes: a gearbox, a generator, a hub, and a controller as described above. The low-speed shaft of the gearbox is connected to the hub, and the high-speed shaft is connected to the generator. The controller is configured to execute the temperature detection method of the gearbox transmission shaft according to any one of the above.

[0115] It should be clear that each embodiment in this specification is described in a progressive manner. For the same or similar parts between each embodiment, reference can be made to each other. The key point of each embodiment is to illustrate the differences from other embodiments. For the device embodiment, reference can be made to the description part of the method embodiment. The embodiments of the present invention are 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 between steps after understanding the spirit of the embodiments of the present invention. And, for the sake of brevity, the detailed description of known method technologies is omitted here.

[0116] The functional blocks shown in the above structural block diagram can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application-specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, and so on. When implemented in software, the elements of the embodiments of the present invention are programs or code segments used to execute the required tasks. The programs or code segments can be stored in a machine-readable medium or transmitted via a data signal carried in a carrier wave on a transmission medium or a communication link. A "machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical discs, hard disks, fiber media, radio frequency (RF) links, and so on. The code segments can be downloaded via a computer network such as the Internet, an intranet, and so on.

[0117] The embodiments of the present invention can be implemented in other specific forms without departing from its spirit and essential features. For example, the algorithms described in specific embodiments can be modified without the basic spirit of the embodiments of the present invention departing from the system architecture. Therefore, the current embodiments are regarded as exemplary in all aspects rather than restrictive. The scope of the embodiments of the present invention is defined by the appended claims rather than the above description, and all changes falling within the meaning and equivalents of the claims are thus included in the scope of the embodiments of the present invention.

Claims

1. A temperature detection method for a transmission shaft of a gearbox, the transmission shaft including a high-speed shaft and a low-speed shaft, the high-speed shaft being connected to a generator of a wind power generation set, and the low-speed shaft being connected to a wind turbine hub, characterized in that, The temperature detection method includes: Obtaining the temperature change amount on the high-speed shaft side and the temperature change amount on the low-speed shaft side during the operation of the wind turbine generator set; Obtaining a first temperature change amount ratio according to the temperature change amount on the high-speed shaft side and the temperature change amount on the low-speed shaft side; In response to the first temperature change amount ratio being within a preset friction heat ratio range, determining that the temperatures on both the high-speed shaft side and the low-speed shaft side are normal.

2. The method according to claim 1, wherein The method further includes: In response to the first temperature change amount ratio being less than the lower limit of the friction heat ratio range, determining that the temperature on the low-speed shaft side is abnormal.

3. The method according to claim 1, wherein A plurality of temperature sensors are arranged on the high-speed shaft side, and the first temperature change amount is calculated based on the measured temperature of the first temperature sensor on the high-speed shaft side; the method further includes: In response to the first temperature change amount ratio being greater than the upper limit of the friction heat ratio range, obtaining the measured temperatures of the second temperature sensor on the high-speed shaft side at the start and end times of the operation of the wind turbine generator set; Calculating the difference between the measured temperatures of the second temperature sensor at the end and start times of the operation of the wind turbine generator set to obtain the temperature change amount on the high-speed shaft side corresponding to the second temperature sensor; Obtaining a second temperature change amount ratio according to the temperature change amount on the high-speed shaft side corresponding to the second temperature sensor and the temperature change amount on the low-speed shaft side; In response to the second temperature change amount ratio being within the friction heat ratio range, determining that the temperature on the high-speed shaft side is normal and determining that the first temperature sensor itself has a data anomaly fault.

4. The method according to claim 3, characterized in that, The method further includes: In response to the second temperature change amount ratio being greater than the upper limit of the friction heat ratio range, obtaining the measured temperatures of the third temperature sensor on the high-speed shaft side at the start and end times of the operation of the wind turbine generator set; Calculating the difference between the measured temperatures of the third temperature sensor at the end and start times of the operation of the wind turbine generator set to obtain the temperature change amount on the high-speed shaft side corresponding to the third temperature sensor; Obtaining a third temperature change amount ratio according to the temperature change amount on the high-speed shaft side corresponding to the third temperature sensor and the temperature change amount on the low-speed shaft side; In response to the third temperature change amount ratio being within the friction heat ratio range, determining that the temperature on the high-speed shaft side is normal and determining that the first temperature sensor and the second temperature sensor itself have data anomaly faults.

5. The method according to claim 3, characterized in that, The first temperature sensor is installed at one of the following positions: the motor side of the high-speed shaft, the blade side, and the three-stage turntable of the gearbox.

6. The method according to claim 3, wherein The first temperature sensor includes a thermocouple temperature sensor and / or a thermal resistance temperature sensor.

7. The method according to claim 1, characterized in that, The method further includes: Obtaining the friction heat ratio of the high-speed shaft side and the low-speed shaft side; Shifting the friction heat ratio upward by a preset ratio to obtain the upper limit of the friction heat ratio range; Shifting the friction heat ratio downward by a preset ratio to obtain the lower limit of the friction heat ratio range; Wherein, the preset ratio is less than or equal to 10%.

8. The method according to claim 1, wherein The temperature change amount on the high-speed shaft side and the temperature change amount on the low-speed shaft side during the operation of the wind turbine generator set include: Obtain the temperature change amount on the high-speed shaft side and the temperature change amount on the low-speed shaft side during the on-site operation or drag test operation of the wind turbine generator set.

9. A controller, characterized in that, Including: At least one processor; And a memory communicatively connected to the at least one processor; wherein, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the temperature detection method of the gearbox transmission shaft according to any one of claims 1-8.

10. A computer-readable storage medium, characterized in that, This computer-readable storage medium stores computer instructions for causing a computer to execute the temperature detection method of the gearbox transmission shaft according to any one of claims 1-8.

11. A wind turbine generator, characterized in that, The wind turbine generator set includes: a gearbox, a generator, a hub, and a controller as claimed in claim 9. The low-speed shaft of the gearbox is connected to the hub, and the high-speed shaft is connected to the generator. The controller is configured to execute the temperature detection method according to any one of claims 1-8.

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