TITLE:
A Novel Multilevel Inverter Circuit for the Performance Enhancement of Direct Torque Controlled Induction Motor
AUTHORS:
Manoj Kumar Nadesan, Geetha Ramadas, Chellamuthu Chinnagounder
KEYWORDS:
Diode Clamped Inverter Circuit, Cascaded H Bridge Inverter, Direct Torque Control, Proportional Integral Controller, Space Vector Modulation, Induction Motor
JOURNAL NAME:
Circuits and Systems,
Vol.7 No.9,
July
29,
2016
ABSTRACT: Induction motor is the
most sought after motor in the industry for excellent performance
characteristics and robustness. Developments in the Power Electronic circuitry
have revolutionised the induction motor industry leading to the developments in
various control strategies and circuits for motor control. Direct Torque
Control (DTC) is one of the excellent control strategies preferred by
industries for controlling the torque and flux in an induction machine. The
main drawback of DTC is the presence of torque ripple which is slightly more
than the acceptable limit. There are various parameters that introduce ripples
in the electromagnetic torque, one of them being the type of inverter circuit.
There are various types of inverter circuits available and the effect of each
of them in the production of torque ripple is different. This work is an
attempt to identify the influence of various multilevel inverter circuits on
the torque ripple level and to propose the best inverter circuit. The influence
of multilevel diode clamped inverter and cascaded H bridge inverter circuits on
torque ripple minimization, is analysed using simulation studies for
identifying the most suitable multilevel inverter circuit which gives minimum
torque ripple. The results obtained from the simulation studies are validated
by hardware implementation on 0.75 kW induction motor.