ASYMMETRIC CASCADED MULTI LEVEL INVERTER USING TWO UNEQUAL DC SOURCES BY FUZZY CONTROLLER

Abstract

From the several levels of DC voltage the multilevel inverters are used to get the desired voltage
waveform from the different inputs. By using the Multilevel inverter it has several advantages such as it
will improve higher efficiency and make the output voltage without harmonic distortion, and make the low
electromagnetic emissions and it also make the capability of operate in the very high voltage levels and
different modularity’s. in the multilevel inverter it has different topologies in that we have use here as
cascaded H-bridge inverter, Flying capacitor and Diode clamped Multi level inverter. Fuzzy controller
being chosen to regulate the output voltage and minimize harmonics of designed seven-level inverter. The
load variations causing the switching surges produce no effect on THD. Fuzzy controllers are used for
wide range of parameter variations and the level of accuracy is compared to be more with PI controller.
The speed of response can be calculated even in microseconds and the control value can be set for multilevel inputs.