ANALYSIS OF AN ASYMMETRICAL REDUCED SWITCH MULTILEVEL INVERTER TOPOLOGY WITH DIFFERENT MODULATION TECHNIQUES USING dSPACE

Abstract

Multilevel inverters are noteworthy in high voltage industrial applications now a day. This study is an experimental analysis of a reduced switch asymmetrical multilevel topology when applied with different modulation schemes. Sinusoidal Pulse width modulation (SPWM) and Space vector pulse width modulation (SVPWM) Techniques are employed to control the MLI. The space Vector algorithm applied here is a general one which can applied to any N- level inverters without much complexity as compared with conventional space vector techniques. The Total Harmonic Distortion (THD) of the MLI output is evaluated for different modulation techniques. The topology can generate 7 level output voltage which is simulated in MATLAB/simulink tool and verified with experimental test setup results. The closeness of simulation value of %THD with the experimental test setup %THD verifies the effectiveness space vector algorithm over SPWM technique