Open AccessTorque derivative control in induction motor drives supplied by multilevel inverters
Author(s) -
Brando Gianluca,
Dannier Adolfo,
Del Pizzo Andrea,
Rizzo Renato,
Spina Ivan
Publication year - 2016
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2014.0958
Subject(s) - control theory (sociology) , induction motor , direct torque control , torque , control (management) , torque motor , computer science , control engineering , engineering , physics , voltage , electrical engineering , artificial intelligence , thermodynamics
The study deals with a novel torque derivative control of induction motor drives. The proposed technique is mainly finalised to improve the motor dynamic response regardless of speed operating conditions, ensuring satisfactory values of both motor currents distortion and torque ripple. The core of the discussed approach is a special look‐up table, in which the converter voltage space vectors are sorted with respect to their influence on the torque derivative, taking also into account their influence on the flux magnitude. The table is indeed accessed by a desired torque derivative value, obtained by properly processing the output of hysteresis controllers. Moreover, a variable duty‐cycle technique is implemented in order to ensure a satisfactory torque ripple in steady‐state conditions. The proposed algorithm, suitable for a general multilevel inverter, is numerically tested on a three‐level neutral point clamped inverter and its performance are compared with the ones obtained by a traditional direct torque control method based on three speed ranges look‐up tables. The control is then validated experimentally by means of a reduced scale laboratory prototype fixing the same condition used for numerical analysis.