Direct Torque Control: Stator Flux Regulation Improvement at Low Speed
Abstract: A simple method to
improve stator flux regulation of a direct torque control (DTC) of induction otor
drive is presented. By using this method, the simple control structure of DTC
is retained and no modification to the voltage vectors look-up table is
required. To implement this technique, the index to the look-up table is
modified so that the reverse voltage vectors are selected (instead of zero-voltage
vectors) whenever the stator flux regulation fails. To study the viability and
the effectiveness of this simple method in improving the flux regulation at low
speed, experiments are conducted to a ¼ hp induction motor with DTC technique.
The control algorithm is implemented using a DS1104 controller board with
Xilinx FPGA.
Author: Nik Rumzi Nik Idris
Journal Code: jptkomputergg170181
