document: Direct self control with minimum torque ripple and high dynamics for a double three-level GTO inverter drive A highly dynamic control scheme with very low torque ripple-direct self control -LRB- DSC -RRB- with torque hysteresis control-for very high-power medium-voltage induction motor drives fed by a double three-level inverter -LRB- D3LI -RRB- is presented . In this arrangement , two three-level inverters that are connected in parallel at their DC sides are feeding the open motor windings . The DSC , well known from two - and three-level inverters , is adapted to the D3LI and optimized for a minimum torque ripple . An 18-corner trajectory is chosen for the stator flux of the induction machine since it is approaching the ideal circle much better than the hexagon known from DSC for two-level inverters , without any detriment to the torque ripple . The machine and inverter control are explained and the proposed torque quality and dynamics are verified by measurements on a 180-kW laboratory drive
doc_bio_tags: B I I O O O O O O O O O O O O O O O B I I I O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B I I O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B I O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B I O O O O O O O O O O O
extractive_keyphrases: highly dynamic control scheme direct self control open motor windings stator flux torque quality
abstractive_keyphrases: very low torque ripple torque hysteresis control medium-voltage induction motor drives double three-level inverter parallel connected inverters variable-speed drives multilevel converters machine observer 180 kw