A Simplified Voltage Vector Selection Strategy for Direct Torque Control
Abstract: The direct torque
control (DTC) for permanent magnet synchronous motor (PMSM) under the control
of switching table suffers from high torque ripple and variable switching
frequency. For PMSM DTC system, voltage vector selection strategy as the
hysteresis control principle determines the system’s performance. The angle (a)
between stator flux vector and the applying voltage vector determines effect of
the voltage vector on the amplitude of stator flux and torque angle. The effect
of the voltage vector on toque is dependent on a, torque angle and parameters
of PMSM. A voltage vector selection strategy based on the technology of space
vector modulation (SVM) is proposed to control stator flux, torque angle and
torque. Experimental results for a 15-kW interior PMSM show it can decrease
stator current and torque ripples and fix the switching frequency.
Author: Li Yaohua Li Yaohua,
Liu Jingyu, Ma Jian Ma Jian, Yu Qiang Yu Qiang
Journal Code: jptkomputergg110063
