Performance improvement of closed loop optimal cascaded high level multilevel inverter fed induction motor drive using ANFIS with low THD and effective speedtorque control

Abstract

Multilevel inverters (MLIs) are mainly attracted by many researchers due to the cause of minimum harmonic distortion and production of good quality medium and high power output than that of conventional two level inverters. This paper presents 63 level optimal structured single phase MLI by means of fewer switches and sinusoidal pulse width modulation (SPWM) technique for controlling switching actions according requirements. Later it implemented as three phase optimal cascaded 63 level multilevel inverter with same SPWM technique controlling technique. Closed loop optimal cascaded high level multilevel inverter feeding induction motor drive with Fuzzy Logic Controller (FLC) has been designed. To obtain better performance with same drive, replace FLC with Adaptive Neuro Fuzzy Inference System (ANFIS) controller by verifying voltage, current, distortion and speed- torque under no load and ON load conditions. The proposed drive of validity has been proved with MATLAB/SIMULINK.