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Predictive Direct Control Applied to AC Drives and Active Power Filter

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4 Author(s)
Drobnic, K. ; Fac. of Electr. Eng., Univ. of Ljubljana, Ljubljana ; Nemec, M. ; Nedeljkovic, D. ; Ambrozic, V.

This paper presents different applications of a method called direct control. The previously developed approach has been redefined into a generalized form. The method relies on the prediction of either current or flux in discrete-time intervals and, consequently, selects the inverter voltage vector that produces the fastest possible transient. Depending on the task, two possible variants have been developed, offering a compromise between ripple in the controlled variable and switching frequency. A special effort has been made to overcome problems due to various delays (processing time, acquisition, gate driver delay, etc.) in the prediction routine, thus achieving maximum performance. The approach has been upgraded for application in AC drives, which allows additional torque control. The functional versatility of the approach has been demonstrated on different applications of power electronics (active power filter, induction machine, surface-mounted permanent-magnet synchronous machine). All applications have been tested on different laboratory models and have confirmed the validity of the approach.

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:56 ,  Issue: 6 )

Date of Publication:

June 2009

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