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T. Wolbank, R.H. Stumberger, R. Lechner, J. Machl:
"Ripple Current reduction by optimizing load dependend swiching losses using adptive current control";
Talk: IEE International Conference on Power Electronics, Machines and Drives (PEMD), Brighton, UK; 2010-04-19 - 2010-04-21; in: "Proceedings of IET International Conference on Power Electronics, Machines and Drives", (2010), ISBN: 978-1-849192316; 1 - 6.

In modern inverter fed drive applications the power
semiconductors used are typically designed to operate at their
maximum thermal operation conditions. Semiconductors
worst case thermal considerations in general define the
uppermost inverter switching frequency dependent on
maximum load current. Fixing this frequency to a constant
value, the drive will not be operated with best possible
performance at partial load. With the help of the proposed
modified predictive current controller it is possible to control
both machine current as well as inverter switching frequency
at once. Using a thermal model of the power semiconductors
hence enables operation at their thermal limit as well as a
reduction of current ripple. In a first step the modified
predictive current controller as well as the thermal model of
the power semiconductors is described. Finally measurement
results on a 220kW high precision industrial load
dynamometer are presented to compare the performance of a
classical predictive current controller and the proposed
modification with switching frequency adaptation.

http://dx.doi.org/10.1049/cp.2010.0174

http://publik.tuwien.ac.at/files/PubDat_189850.pdf