Start-up with medium voltage stator 73
06.01 STATOR IU is zero.
06.02 STATOR IY measures negative values. Absolute values are higher than with the
phase U test.
Note: Values depend on the battery voltage and current transformer transformation ratio.
Note: When battery is removed, the signals behaves in the opposite way.
Test at zero speed
For testing purposes it is possible to start the converter at zero speed. Then the rotor-side
converter modulates but the main circuit breaker will not be closed. The produced slip ring
current is approximately 20…30 A which does not harm the slip rings during a short test
period.
This feature can be used in the commissioning when the wind is so weak that it rotates the
blades but can not accelerate the rotor to the minimum speed ie, 1 m/s needed at start-up.
The figure below represents normal behavior when the rotor-side converter is started for a
short time.
0
200
400
600
800
1000
1200
0 2000 4000 6000 8000 10000
0
20
40
60
80
100
120
1.10 DC VOLTAGE [v]
1.11 MAINS VOLTAGE [V]
2.01 STATOR IS (rms) [A]
2.06 ROTOR IR (rms) [A]
2.02 STATOR VOLTAGE [v]
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