GB/T 25388.2-2021Wind turbines generator system—Double-fed converter—Part 2: Test method (English PDF)

3.1 Test environment conditions

The test environment conditions of the converter should meet the following requirements.

a) Temperature. 15°C~35°C;

b) Relative humidity. 45%~75%;

c) Atmospheric pressure. 86kPa~106kPa; d) Altitude. <=2000m.

Value, the converter should be able to stop immediately. After the shutdown is completed, the converter should be able to report the correct fault information without any abnormality. The fault is eliminated and After reset, the normal grid-connected state can be restored.

Or refer to the simulation test platform in 4.1, start the converter to complete the grid connection, and simulate the method of feedback signal inversion of the protection device, The converter should be able to stop immediately. After the shutdown is completed, the converter should be able to report the correct fault information without any abnormality. The fault is cleared and reset After that, the normal grid-connected state can be restored.

4.2 Test items and content

4.2.21 Protection function test

4.2.21.1.3 Phase loss protection

According to the simulation test platform in 4.1, disconnect a phase cable of the AC terminal on the grid side and the machine side under the shutdown state. Main power of the upper system, variable current The device should be able to report the correct fault information, and it is forbidden to start the machine without any abnormality. After the fault is eliminated and reset, the normal grid-connected state can be restored.

4.2.21.1.4 Phase sequence error protection

According to the simulation test platform in 4.1, switch the two-phase cable on the grid side or the machine side under the state of shutdown and power failure. The main power of the system, the converter should The correct fault information can be reported, and the machine is forbidden to start without any abnormality. After the fault is eliminated and reset, the normal grid-connected state can be restored.

4.2.21.1.5 Instantaneous overcurrent protection test

According to the simulation test platform in 4.1, in the shutdown state, the hardware protection threshold is modified to reduce the instantaneous overcurrent hardware Protection threshold threshold. Start the converter to complete the grid connection, and adjust the AC terminal current of the grid-side converter and the machine-side converter respectively to trigger the working current The instantaneous overcurrent protection threshold, the converter should be able to stop immediately. After the shutdown is completed, the converter should be able to report the correct fault information without any abnormal. After the fault is eliminated and reset, the normal grid-connected state can be restored.

4.2.21.1.6 DC overvoltage protection

According to the simulation test platform in 4.1, when the power is off, the hardware protection threshold is modified to reduce the DC overvoltage hardware protection.

Protection threshold threshold. Start the converter to complete the grid connection, make the DC bus voltage higher than the threshold threshold, trigger the DC overvoltage fault, the converter should be able to Shut down immediately. After the shutdown is completed, the converter should be able to report the correct fault information without any abnormality. After the fault is eliminated and reset, it can be restored Normal grid-connected state.

4.2.21.1.7 DC undervoltage protection

According to the simulation test platform in 4.1, when the power is off, the hardware protection threshold is modified to increase the DC undervoltage hardware protection.

Protection threshold threshold. Start the converter to complete the grid connection, so that the DC bus voltage is lower than the threshold threshold, and the DC undervoltage fault is triggered. The converter should be able to Shut down immediately. After the shutdown is completed, the converter should be able to report the correct fault information without any abnormality. After the fault is eliminated and reset, it can be restored Normal grid-connected state.

4.2.21.2 Type 2 fault protection

4.2.21.2.1 Voltage unbalance protection

According to the simulation test platform in 4.1, turn on the main power of the system and start the grid-connected operation of the converter. Adjust the output voltage of the power grid simulator to make the If the unbalance degree of the pressure-negative sequence exceeds the software protection threshold, the converter should be able to reduce the load and shut down according to the set slow shutdown strategy. After the shutdown is completed, the flow is changed The device should be able to report the correct fault information without any abnormalities. After the fault is eliminated and reset, the normal grid-connected state can be restored.

4.2.21.2.2 Power grid over-frequency protection

According to the simulation test platform in 4.1, turn on the main power of the system and start the grid-connected operation of the converter. Adjust the output grid frequency of the grid simulator to make If the grid frequency exceeds the software protection threshold, the converter should be able to reduce load and stop according to the set slow shutdown strategy. After the shutdown is complete, the converter should The correct fault information can be reported without any exceptions. After the fault is eliminated and reset, the normal grid-connected state can be restored.

4.2.21.2.3 Grid under-frequency protection

According to the simulation test platform in 4.1, turn on the main power of the system and start the grid-connected operation of the converter. Adjust the output grid frequency of the grid simulator to make If the grid frequency is lower than the software protection threshold, the converter should be able to reduce load and stop according to the set slow shutdown strategy. After the shutdown is complete, the converter should The correct fault information can be reported without any exceptions. After the fault is eliminated and reset, the normal grid-connected state can be restored.

4.2.21.2.4 Overcurrent protection

According to the simulation test platform in 4.1, under the state of shutdown and power failure, reduce the overcurrent software protection by modifying the software protection threshold method Threshold threshold. Start the converter to complete the grid connection, and adjust the AC terminal current of the grid-side converter and the machine-side converter respectively, so that the working current triggers over-voltage Current protection threshold, the converter should be able to reduce load and stop according to the set slow shutdown strategy. After the shutdown is completed, the converter should be able to report the correct fault Information without any exceptions. After the fault is eliminated and reset, the normal grid-connected state can be restored.

4.2.21.2.5 Generator over-speed protection

According to the simulation test platform in 4.1, turn on the main power of the system and start the grid-connected operation of the converter. Adjust the generator speed to exceed the over-speed protection threshold When the time, the converter should be able to reduce the load and stop according to the set slow stop strategy. After the shutdown is completed, the converter should be able to report the correct fault information, and no Any abnormalities. After the fault is eliminated and reset, the normal grid-connected state can be restored.

4.2.21.2.6 Generator underspeed protection

According to the simulation test platform in 4.1, turn on the main power of the system and start the grid-connected operation of the converter. Adjust the generator speed to be lower than the underspeed protection threshold When the time, the converter should be able to reduce the load and stop according to the set slow stop strategy. After the shutdown is completed, the converter should be able to report the correct fault information, and no Any abnormalities. After the fault is eliminated and reset, the normal grid-connected state can be restored.

4.2.21.2.7 Communication fault protection

According to the simulation test platform in 4.1, the main power of the system is connected, and the grid-connected operation of the converter is started through the simulation main control. Disconnect the converter from the analog main The converter should be able to reduce load and stop according to the set slow stop strategy. After the shutdown is completed, the converter should be able to report the correct fault message Information, and there is no abnormality. After the fault is eliminated and reset, the normal grid-connected state can be restored.

4.2.21.2.8 Cooling system failure protection

According to the simulation test platform in 4.1, turn on the main power of the system and start the grid-connected operation of the converter. Stop the operation of the cooling system of the converter, change the flow The generator should be able to reduce load and stop according to the set slow stop strategy. After the shutdown is completed, the converter should be able to report the correct fault information without any difference. often. After the fault is eliminated and reset, the normal grid-connected state can be restored.

4.2.21.2.9 Over temperature protection

According to the simulation test platform in 4.1, under the state of shutdown and power failure, lower the over-temperature protection threshold by modifying the software protection threshold. limit. Start the converter to complete the grid connection, so that the ambient temperature, coolant temperature, device temperature, etc. exceed the corresponding temperature protection threshold, and the converter should be able to According to the set slow stop strategy, the load will be reduced and the stop will be stopped. After the shutdown is completed, the converter should be able to report the correct fault information without any abnormality. Therefore After the fault is eliminated and reset, the normal grid-connected state can be restored.

4.2.21.2.10 Surge over-voltage protection

According to the simulation test platform in 4.1, remove the converter surge protection device or absorption device, the converter should be able to correctly identify and prompt Alarm.

4.2.22 Immunity test

4.2.22.1 Electrostatic discharge immunity test

The converter can be operated under light load, and the test shall be carried out in accordance with the provisions of GB/T 17626.6 and under the following conditions.

a) Test voltage. contact discharge 6kV, air discharge 8kV;

b) Test port. the whole shell;

c) The number of discharges at each sensitive point test point. 10 times for each of the positive and negative polarity, and the interval between each discharge is at least 1s;

d) Performance criterion. It is judged in accordance with the relevant regulations of GB/T 25388.1.

4.2.22.2 Radio frequency electromagnetic field radiation immunity test

The converter can be operated under light load, and the test shall be carried out in accordance with the provisions of GB/T 17626.3 and under the following conditions.

a) Frequency range. 80MHz~1000MHz;

b) Test field strength. 10V/m;

c) 1kHz sine wave, 80% amplitude modulation;

d) Test port. the whole shell;

e) Antenna polarization direction. horizontal and vertical direction;

f) Performance criterion. It is judged in accordance with the relevant regulations of GB/T 25388.1.

4.2.22.3 Electric fast pulse group immunity test

The converter can be operated under light load, in accordance with the provisions of GB/T 17626.4 and tested under the following conditions.

a) Test voltage. ±2kV (power line), ±1kV (signal line);

b) Test port. input and output power port, signal line;

c) Repetition frequency. 5kHz/100kHz;

d) Duration. 1min;

e) Performance criterion. It is judged in accordance with the relevant regulations of GB/T 25388.1.

4.2.22.4 Surge voltage immunity test

The converter can be operated under light load, in accordance with the provisions of GB/T 17626.5 and tested under the following conditions.

a) Test voltage. ±2kV (common mode), ±1kV (differential mode);

b) Test port. input and output power port, signal line;

c) Polarity. positive and negative;

d) Test times. 5 times for positive and negative polarity;

e) Repetition rate. once per minute;

f) Performance criterion. It is judged in accordance with the relevant regulations of GB/T 25388.1.

4.2.22.5 Conducted disturbance immunity test

The converter can be operated under light load, and the test shall be carried out in accordance with the provisions of GB/T 17626.6 and under the following conditions.

a) Frequency range. 0.15MHz~80MHz;

b) Test field strength. 10V (modulation);

c) 1kHz sine wave, 80% amplitude modulation;

d) Test port. external port;

e) Injection method. CDN or current clamp, electromagnetic clamp;

f) Performance criterion. It is judged in accordance with the relevant regulations of GB/T 25388.1.

4.2.23 Electromagnetic emission test

4.2.23.1 Conducted emission test

The converter should be operated under normal full load or light load, in accordance with the provisions of GB/T 12668.3-2012 and under the following conditions test.

a) Test frequency band. 150kHz~30MHz;

b) Test port. input and output power port, signal line;

c) Test limit. According to the C3 limit of 6.5.2 in GB/T 12668.3-2012.

4.2.23.2 Radiation emission test

The converter should operate under normal full-load or light-load grid-connected working conditions, in accordance with the provisions of GB/T 12668.3-2012 and in the following conditions Test under pieces.

a) Test frequency band. 30MHz~1000MHz;

b) Test port. shell port;

c) Test limit. According to the C3 limit of 6.5.2 in GB/T 12668.3-2012.

4.2.24 Communication test

According to the simulation test platform in 4.1, the converter and the unit control system can carry out communication tests. The main content of the test should include opening Machine process, control process (instruction issuance), shutdown process, protection and reset process, data and status exchange, etc.

4.2.25 Low temperature working test

The test method is carried out in accordance with "Test A" in GB/T 2423.1-2008.

4.2.26 High temperature work test

The test method is carried out in accordance with "Test B" in GB/T 2423.2-2008.

4.2.27 Constant humidity test

The test method is carried out in accordance with "Test Cab" in GB/T 2423.3-2016.

4.2.28 Alternating damp heat test

The test method is carried out in accordance with "Test Db" in GB/T 2423.4-2008.

4.2.29 Protection performance test

The test method is to carry out the protective performance test in accordance with the provisions of GB/T 4208.

4.2.30 Vibration test

The test method is carried out in accordance with "Test Fh" in GB/T 2423.56-2018.

4.2.31 Noise test

The converter should operate stably under the conditions of rated grid voltage, rated grid frequency, converter rated output power, and grid-side unit power factor Perform a noise test under. The automatic switching fan inside the converter should be in operation.

Place the sound level meter at a height of 1m from the ground plane where the converter is placed, and at a distance of 1m from the front, back, left, and right of the enclosure, and then measure Quantity [Environmental noise should not be higher than 60dB(A)], take the maximum value.

4.2.32 Additional test

If there are other requirements for the converter that are not included in the above test items, they should be put forward when ordering and an agreement should be obtained.