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High frequency with inverter back to back for dfig Wind generator

High frequency with inverter back to back for dfig Wind generator

High frequency with inverter back to back for dfig Wind generator

(OP)
Hi.

The picture in attached was measurement from dranetz px5 in transformer with 3 winding.1 Winding in High voltage, 2 winding in 690v for inverter back to back and the 3 winding in 400 v for other loads where I did measurement.

The high frequency in sine wave measurmet can have relations with common mode from inverter back to back in 2 winding?

The inverter back to back is used for reactive Power, frequency control nas other things in dfig Wind generator

Guilherme S.

RE: High frequency with inverter back to back for dfig Wind generator

As inverters go, that's fairly clean looking, I've seen a lot worse. But to answer your question, yes, that's indicative of common mode noise resulting from the PWM firing.


" We are all here on earth to help others; what on earth the others are here for I don't know." -- W. H. Auden

RE: High frequency with inverter back to back for dfig Wind generator

Just post the dang thing.


Keith Cress
kcress - http://www.flaminsystems.com

RE: High frequency with inverter back to back for dfig Wind generator

(OP)
I was think in a possible solution, use a new transformer HV/LV just 400V. HV is clean. there are problem if I use same ground in same transformers (Y/Yn ground)?

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