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G. Stojcic, K. Pasanbegovic, T. Wolbank:
"Detecting Faults in Doubly Fed Induction Generator by Rotor Side Transient Current Measurement";
Vortrag: IEEE International Energy Conversion Congress and Exposition (ECCE), Denver, CO, USA; 15.09.2013 - 19.09.2013; in: "Proceedings of IEEE International Energy Conversion Congress and Exposition (ECCE)", (2013), ISBN: 978-1-4799-0336-8; S. 4420 - 4425.

The doubly fed induction generator (DFIG) is one
of the main technologies at variable speed power generation
systems. Reliability and efficiency are key factors to realize the
maximum energy output of the renewable resources. Detecting
generator faults enables the reduction of risk for unexpected
outages and thus high economic losses. Stator winding
insulation faults count to one of the most frequent failures in
electric machines. Common fault detection methods are based
on several additional sensors and hardware what makes the
system complex, expansive and also fault-prone. In this work a
method is proposed and investigated to detect stator winding
faults based only on measured signals available from inverter
build-in sensors. By rotor-side inverter switching the generator
is excited by transient voltage pulses and the current response
provides the possibility to extract a fault indicator through a
specific signal processing. Measurements on DFIG test stand
prove the methods applicability and accuracy.

http://dx.doi.org/10.1109/ECCE.2013.6647291

http://publik.tuwien.ac.at/files/PubDat_223929.pdf