An improved performance of F2DTC induction motor using five-level SVM

This paper presents proportional integral direct torque control (PIDTC) and fuzzy-2 DTC (F2DTC) of the induction motor (IM) drive using space vector modulation (SVM) for five-level diode clamped inverter (FDCI). The above control schemes have been implemented in the laboratory using 2HP IM through a DSPACE DS-1104 controller. The dc-link capacitor voltages of FDCI are balanced in both the control schemes. However, the PIDTC of IM with five-level inverter gives poor transient performance during starting, loading, and speed reversal with considerable current and voltage total harmonic distortion (THD). In addition, it takes more time to reach the steady state with large spikes on capacitor voltages during the load or speed perturbation. This is due to poor performance of the PI-controllers (speed, torque, and voltage). In F2DTC, the conventional PI-controllers are replaced by Mamdani type fuzzy-2 controllers using Centroid method with simple logical rules and it controls the duty ratios to improve the firing strength of the inverter.