Full-period T-n curve test system and method of fan yaw asynchronous motor

Abstract

The invention discloses a full-period T-n curve test system and method for a yaw asynchronous motor of a fan. The full-period T-n curve test system comprises a tested motor M1, a test accompanying motor M2, a twin trawling table and a torque sensor, the tested motor M1 and the test accompanying motor M2 are installed on the twin trawling table, the tested motor M1 and the test accompanying motor M2 are connected through a torque sensor, after the rated power of the test accompanying motor M2 is converted to the rotating speed of the tested motor M1, the rated power needs to be more than two times of the rated power of the tested motor M1, and the output rotating speed and torque of the test accompanying motor M2 are adjusted through a frequency converter during testing. Therefore, the tested motor M1 works at different rotating speeds, and the torque and rotating speed values are read and recorded through the torque sensor. According to the invention, T-n curve testing of the asynchronous motor under all operation conditions is realized so as to check the performance of the asynchronous motor.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, and in particular to a full-cycle Tn curve testing system and method for a wind turbine yaw asynchronous motor. Background Art

[0002] With the development of large-scale wind turbines, the unit capacity of wind turbines has gradually developed from the original 2MW and 3MW to 8MW, 12MW and even 20MW, but the asynchronous motor used in the yaw system has only developed from the original 2.2KW and 3kw to 5.5kw. The power increase of the asynchronous motor does not match the increase in the unit capacity. Since the asynchronous motor itself has a strong overload capacity and high reliability, this method can meet the purpose of cost reduction. However, the disadvantage of this method is that this leads to relatively extreme operating conditions for the asynchronous motors of large megawatt wind turbines, such as overspeed, reversal, and stall. For this reason, it is necessary to test the Tn curve of the asynchronous motor under all operating conditions to verify the performance of the asynchronous motor. Summary of the invention

[0003] The first object of the present invention is to provide a full-cycle Tn curve test system for a wind turbine yaw asynchronous motor, which is used to implement Tn curve testing under all operating conditions of the asynchronous motor to verify the performance of the asynchronous motor.

[0004] The second object of the present invention is to provide a full-cycle Tn curve testing method for a wind turbine yaw asynchronous motor to ensure the accuracy and reliability of the Tn curve testing.

[0005] The first object of the present invention is achieved through the following technical scheme: a full-cycle Tn curve test system for a wind turbine yaw asynchronous motor, comprising a motor to be tested M1, a companion motor to be tested M2, a towing platform and a torque sensor; wherein the motor to be tested M1 is an asynchronous motor, and needs to be equipped with a thermometer, a power analyzer and a speed sensor; the companion motor to be tested M2 is an asynchronous motor or a synchronous motor, and needs to be equipped with a thermometer and a frequency converter. To ensure the rigor of the test, the companion motor to be tested M2 is equipped with a power analyzer and a speed sensor. If the power analyzer and the speed sensor cannot be configured, the power analyzer and the speed sensor are read by the frequency converter. The output parameters of the accompanying motor M2, including the output speed and torque, are obtained from the data; the motor M1 under test and the accompanying motor M2 under test are installed on a pair of dragging platforms, the motor M1 under test and the accompanying motor M2 under test are connected through a torque sensor, and the rated power of the accompanying motor M2 under test must be more than twice the rated power of the motor M1 under test after being converted to the speed of the motor M1 under test. During the test, the output speed and torque of the accompanying motor M2 under test are adjusted by the frequency converter so that the motor M1 under test works at different speeds, and the torque and speed values ​​are read and recorded by the torque sensor.

[0006] Furthermore, the thermometer is a temperature gun or PT100.

[0007] The second object of the present invention is achieved by the following technical solution: a full-cycle Tn curve test method for a wind turbine yaw asynchronous motor, which is implemented based on the full-cycle Tn curve test system for the wind turbine yaw asynchronous motor. The method tests the four working conditions encountered by the asynchronous motor during the yaw process: normal operation, overspeed, reverse rotation and stall, as follows:

[0008] a. Normal operating condition test

[0009] The accompanying test motor M2 is powered on, and the frequency converter is used for V / F control, that is, the output voltage is controlled in proportion to the frequency, so as to control the speed of the accompanying test motor M2. The direction of the accompanying test motor M2 is consistent with that of the tested motor M1. The tested motor M1 is started at the same time, and the speed of the accompanying test motor M2 is adjusted. The test is divided into two parts, namely, the speed of the accompanying test motor M2 is gradually increased from zero to the synchronous speed, which is called the 0-synchronous speed test, and the speed of the accompanying test motor M2 is gradually reduced from the synchronous speed to zero, which is called the synchronous speed-0 test. During the above two tests, the torque sensor is used to read and record the corresponding torque and speed values, and then the Tn curves of the speed increase and decrease are drawn according to the recorded torque and speed values, that is, the torque-speed curve. After obtaining two Tn curves, the average value of each point on the curve is taken to draw the final Tn curve;

[0010] b. Overspeed test

[0011] First, start the accompanying motor M2 at the minimum speed, then start the motor M1 under test, accelerate the accompanying motor M2 until the speed of the motor M1 under test reaches the synchronous speed, and then slowly increase the speed of the accompanying motor M2 until it reaches more than 150% of the synchronous speed of the motor M1 under test, use a torque sensor to record the data of the motor M1 under test during supersynchronous operation and draw the corresponding Tn curve;

[0012] c. Reverse working condition test

[0013] The direction of the accompanying motor M2 is opposite to that of the motor M1 under test. The inverter is used to control the driving of the accompanying motor M2 until it reaches the synchronous speed of the motor M1 under test. Then the motor M1 under test is started. At this time, the direction of the rotating magnetic field of the motor M1 under test is opposite to that of the accompanying motor M2 under test. The motor M1 under test is running in the electromagnetic braking state. The test starts from the synchronous speed of the motor M1 under test and gradually decreases. The torque sensor is used to record the data of the motor M1 under test when it is reversed and the corresponding Tn curve is drawn;

[0014] d. Stalled rotor condition test

[0015] The rotation direction of the accompanying motor M2 is opposite to that of the motor under test M1. At this time, the frequency converter is in torque control mode. Start the frequency converter to control the torque of the accompanying motor M2 from zero to more than 2.5 times the rated torque of the motor under test M1, and then start the motor under test M1. Observe whether the motor under test M1 is blocked, and use a torque sensor to read and record the torque of the motor under test M1 and draw the corresponding T-n curve. During the test, if the motor under test M1 can rotate, the output torque of the accompanying motor M2 needs to be increased until the motor under test M1 is blocked.

[0016] Furthermore, during the normal operation condition test, the drawing time for each curve is not less than 20 s.

[0017] Furthermore, during the normal operation condition test, after drawing the T-n curve of the rising speed, the power supply of the motor under test M1 needs to be cut off, and wait for the motor to cool down to room temperature before conducting the test of the falling speed.

[0018] Furthermore, during the normal operation condition test, the test frequency is based on the maximum frequency of the torque sensor, and the time for the 0-synchronous speed test and the synchronous speed-0 test is 1 minute.

[0019] Furthermore, during the test of the reverse operation condition and the blocked operation condition, if the temperature rise of the motor under test M1 is higher than the preset value, the power supply of the motor under test M1 needs to be cut off, and the motor under test M1 is driven by the accompanying motor M2 to rotate idly to quickly reduce the motor temperature and ensure the test safety.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0021] 1. The test under the reverse and overspeed conditions of the asynchronous motor is added to more comprehensively check the performance of the yaw motor.

[0022] 2. The design of this system is simple and reliable, with fewer components, ensuring the stability during the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the schematic diagram of the full-cycle T-n curve test system.

[0024] Figure 2 It is the physical diagram of the full-cycle T-n curve test system. DETAILED DESCRIPTION OF THE INVENTION

[0025] The present invention will be further described in detail below in conjunction with the embodiments and the drawings, but the embodiments of the present invention are not limited thereto.

[0026] Embodiment 1

[0027] As Figure 1 and Figure 2As shown, the present embodiment discloses a full-cycle Tn curve test system for a yaw asynchronous motor of a wind turbine, comprising a motor to be tested M1, a companion motor to be tested M2, a towing platform and a torque sensor; wherein the motor to be tested M1 is an asynchronous motor, and needs to be equipped with a thermometer (which can be a temperature gun or PT100), a power analyzer and a speed sensor; the companion motor to be tested M2 is an asynchronous motor or a synchronous motor, and needs to be equipped with a thermometer and a frequency converter. To ensure the rigor of the test, the companion motor to be tested M2 is equipped with a power analyzer and a speed sensor. If the power analyzer and the speed sensor cannot be configured, the power analyzer and the speed sensor are read by the variable The output parameters of the accompanying motor M2, including the output speed and torque, are obtained from the data of the frequency converter; the motor M1 under test and the accompanying motor M2 under test are installed on the dragging platform, and the motor M1 under test and the accompanying motor M2 under test are connected through a torque sensor. After the rated power of the accompanying motor M2 is converted to the speed of the motor M1 under test, it must be more than twice the rated power of the motor M1 under test. During the test, the output speed and torque of the accompanying motor M2 under test are adjusted by the frequency converter, so that the motor M1 under test works at different speeds, and the torque and speed values ​​are read and recorded by the torque sensor.

[0028] Example 2

[0029] This embodiment discloses a full-cycle Tn curve test method for a wind turbine yaw asynchronous motor, which is implemented based on the full-cycle Tn curve test system for a wind turbine yaw asynchronous motor described in Example 1. The method mainly tests four operating conditions encountered by the asynchronous motor during the yaw process: normal operation, overspeed, reverse rotation and stall, as follows:

[0030] a. Normal operating condition test

[0031] The accompanying motor M2 is powered on, and the frequency converter is used for V / F control, that is, the output voltage is controlled in proportion to the frequency, so as to control the speed of the accompanying motor M2. The direction of the accompanying motor M2 is consistent with that of the motor M1 under test. The motor M1 under test is started at the same time, and the speed of the accompanying motor M2 is adjusted. The test is divided into two parts, namely, the speed of the accompanying motor M2 is gradually increased from zero to the synchronous speed, which is called the 0-synchronous speed test, and the speed of the accompanying motor M2 is gradually reduced from the synchronous speed to zero, which is called the synchronous speed-0 test. During the above two tests, the torque sensor is used to read Take the corresponding torque and speed values ​​and record them, then draw the Tn curves of speed increase and decrease, i.e. torque-speed curves, respectively according to the recorded torque and speed values. After obtaining two Tn curves, take the average value of each point on the curve to draw the final Tn curve; wherein, the drawing time of each curve is not less than 20s. After drawing the Tn curve of speed increase, the motor M1 to be tested needs to be powered off, and the speed decrease test is performed after the motor cools to room temperature. The test frequency is based on the maximum frequency of the torque sensor, and the time for the 0-synchronous speed test and the synchronous speed-0 test is 1 minute;

[0032] b. Overspeed test

[0033] First, start the accompanying motor M2 at the minimum speed, then start the motor M1 under test, accelerate the accompanying motor M2 until the speed of the motor M1 under test reaches the synchronous speed, and then slowly increase the speed of the accompanying motor M2 until it reaches more than 150% of the synchronous speed of the motor M1 under test, use a torque sensor to record the data of the motor M1 under test during supersynchronous operation and draw the corresponding Tn curve;

[0034] c. Reverse working condition test

[0035] The direction of the accompanying motor M2 is opposite to that of the motor M1 under test. The inverter is used to control the driving of the accompanying motor M2 until it reaches the synchronous speed of the motor M1 under test. Then the motor M1 under test is started. At this time, the direction of the rotating magnetic field of the motor M1 under test is opposite to that of the accompanying motor M2 under test. The motor M1 under test is running in the electromagnetic braking state. The test starts from the synchronous speed of the motor M1 under test and gradually decreases. The torque sensor is used to record the data of the motor M1 under test when it is reversed and the corresponding Tn curve is drawn;

[0036] d. Stalled rotor condition test

[0037] The direction of the accompanying motor M2 is opposite to that of the motor M1 under test. At this time, the inverter is in torque control mode. The inverter is started to control the torque of the accompanying motor M2 from zero to more than 2.5 times the rated torque of the motor M1 under test, and then the motor M1 under test is started to observe whether the motor M1 under test is blocked. The torque sensor is used to read and record the torque of the motor M1 under test and draw the corresponding Tn curve. During the test, if the motor M1 under test can rotate, the output torque of the accompanying motor M2 needs to be increased until the motor M1 under test is blocked.

[0038] In addition, during the test of reverse working condition and stalled working condition, if the temperature rise of the motor M1 under test is higher than the preset value, it is necessary to cut off the power supply of the motor M1 under test, and drive the motor M1 under test to idle by the companion motor M2 to quickly reduce the motor temperature and ensure the safety of the test.

[0039] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A full-cycle Tn curve test system for a wind turbine yaw asynchronous motor, characterized in that: It includes a motor M1 to be tested, a motor M2 to be tested, a pairing platform and a torque sensor; wherein the motor M1 to be tested is an asynchronous motor and needs to be equipped with a thermometer, a power analyzer and a speed sensor; the motor M2 to be tested is an asynchronous motor or a synchronous motor and needs to be equipped with a thermometer and a frequency converter. To ensure the rigor of the test, the motor M2 to be tested is equipped with a power analyzer and a speed sensor. If the power analyzer and the speed sensor cannot be configured, the output parameters of the motor M2 to be tested are obtained by reading the data of the frequency converter, including the output speed and torque; the motor M1 to be tested and the motor M2 to be tested are installed on the pairing platform, the motor M1 to be tested and the motor M2 to be tested are connected through a torque sensor, the rated power of the motor M2 to be tested is converted to the speed of the motor M1 to be tested, and needs to be more than twice the rated power of the motor M1 to be tested. During the test, the output speed and torque of the motor M2 to be tested are adjusted by the frequency converter, so that the motor M1 to be tested works at different speeds, and the torque and speed values ​​are read and recorded by the torque sensor.

2. A full-cycle Tn curve test system for a wind turbine yaw asynchronous motor according to claim 1, characterized in that: The thermometer is a temperature gun or PT100.

3. A full-cycle Tn curve test method for a wind turbine yaw asynchronous motor, characterized in that: The full-cycle Tn curve test system of the wind turbine yaw asynchronous motor according to claim 1 or 2 is implemented. The method is to test the four working conditions encountered by the asynchronous motor during the yaw process: normal operation, overspeed, reverse rotation and stall, as follows: a. Normal operating condition test The accompanying test motor M2 is powered on, and the frequency converter is used for V / F control, that is, the output voltage is controlled in proportion to the frequency, so as to control the speed of the accompanying test motor M2. The direction of the accompanying test motor M2 is consistent with that of the tested motor M1. The tested motor M1 is started at the same time, and the speed of the accompanying test motor M2 is adjusted. The test is divided into two parts, namely, the speed of the accompanying test motor M2 is gradually increased from zero to the synchronous speed, which is called the 0-synchronous speed test, and the speed of the accompanying test motor M2 is gradually reduced from the synchronous speed to zero, which is called the synchronous speed-0 test. During the above two tests, the torque sensor is used to read and record the corresponding torque and speed values, and then the Tn curves of the speed increase and decrease are drawn according to the recorded torque and speed values, that is, the torque-speed curve. After obtaining two Tn curves, the average value of each point on the curve is taken to draw the final Tn curve; b. Overspeed test First, start the accompanying motor M2 at the minimum speed, then start the motor M1 under test, accelerate the accompanying motor M2 until the speed of the motor M1 under test reaches the synchronous speed, and then slowly increase the speed of the accompanying motor M2 until it reaches more than 150% of the synchronous speed of the motor M1 under test, use a torque sensor to record the data of the motor M1 under test during supersynchronous operation and draw the corresponding Tn curve; c. Reverse working condition test The direction of the accompanying motor M2 is opposite to that of the motor M1 under test. The inverter is used to control the driving of the accompanying motor M2 until it reaches the synchronous speed of the motor M1 under test. Then the motor M1 under test is started. At this time, the direction of the rotating magnetic field of the motor M1 under test is opposite to that of the accompanying motor M2 under test. The motor M1 under test is running in the electromagnetic braking state. The test starts from the synchronous speed of the motor M1 under test and gradually decreases. The torque sensor is used to record the data of the motor M1 under test when it is reversed and the corresponding Tn curve is drawn; d. Stalled rotor condition test The direction of the accompanying motor M2 is opposite to that of the motor M1 under test. At this time, the inverter is in torque control mode. The inverter is started to control the torque of the accompanying motor M2 from zero to more than 2.5 times the rated torque of the motor M1 under test, and then the motor M1 under test is started to observe whether the motor M1 under test is blocked. The torque sensor is used to read and record the torque of the motor M1 under test and draw the corresponding Tn curve. During the test, if the motor M1 under test can rotate, the output torque of the accompanying motor M2 needs to be increased until the motor M1 under test is blocked.

4. A full-cycle Tn curve test method for a wind turbine yaw asynchronous motor according to claim 3, characterized in that: In normal operating condition testing, the drawing time of each curve shall not be less than 20s.

5. The full-cycle Tn curve testing method of a wind turbine yaw asynchronous motor according to claim 3 is characterized in that: In the normal operating condition test, after drawing the Tn curve of the speed increase, it is necessary to cut off the power of the motor M1 under test and wait for the motor to cool to room temperature before performing the speed reduction test.

6. A full-cycle Tn curve test method for a wind turbine yaw asynchronous motor according to claim 3, characterized in that: In the normal operating condition test, the test frequency is based on the maximum frequency of the torque sensor, and the time for the 0-synchronous speed test and the synchronous speed-0 test is 1 minute.

7. The full-cycle Tn curve testing method of a wind turbine yaw asynchronous motor according to claim 3 is characterized in that: During the test of reverse working condition and stalled working condition, if the temperature rise of the motor M1 under test is higher than the preset value, it is necessary to cut off the power supply of the motor M1 under test, and drive the motor M1 under test to idle by the companion motor M2 to quickly reduce the motor temperature and ensure the safety of the test.

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