A Novel Dynamic Overmodulation Strategy of Direct Torque Control
Abstract: The direct torque
control-space vector modulation (DTC-SVM) is well-known for achieving excellent
dynamic overmodulation. However, the method uses complicated predictive stator
flux vector control and requires high precision stator flux vector to define
overmodulation mode. This paper proposes a straightforward dynamic
overmodulation method and constant switching frequency controller without SVM
to obtain a faster dynamic torque response in DTC for induction machines. To
perform this method, the flux error status produced from the flux hysteresis
comparator during dynamic condition is modified slightly before being fed to
the look-up table. The verification of proposed method was performed using
MATLAB/Simulink simulation package. The effects of different switching and
operating condition on dynamic torque performance are analyzed. The result
shows that a faster torque response is achieved in proposed dynamic
overmodulation DTC method. The main benefit of the proposed method is its
simplicity since only minor modification is made to the basic DTC
hysteresis-based structure.
Penulis: Auzani Jidin, Tole
Sutikno, Aiman Zakwan Jidin, Nik Rumzi Nik Idris, Abdul Halim Mohd Yatim
Kode Jurnal: jptkomputerdd100051
