Study of an Improved Fuzzy Direct Torque Control of Induction Motor
Abstract: The conventional
direct torque control will inevitably produce torque ripple because of its way
of flux estimates. For the purpose of handling this problem, a new control
strategy was presented in this paper. This strategy combined subdivides control
with voltage vector and fuzzy logic control in traditional direct torque
control. In this model, the fuzzy logic combined the phase angle of the flux,
the flux error and torque error as fuzzy variables and classified these fuzzy
variables, in order to optimize the choice of voltage space vector, and the
same time the traditional PID regulator is replaced by a fuzzy regulator.
Simulation results show that, a great improvement torque responses , a great reduction
of torque ripples is achieved and the strategy has a better dynamic and steady
performance, especially in low-speed area.
Keywords: torque ripple;
direct torque control; fuzzy control; vectors subdivision; fuzzy speed
regulator
Author: Dong Ming, Tang
Yong-qi, Song Hai-liang, Wang Bing-jie
Jouranl Code: jptkomputergg130100
