Performance Analysis of Multilevel Inverter Upto XI Level With Pem Fuel Cell Based Energy System

Nowadays Renewable energy sources play a prominent role in the areas of research, due to exhaustion of conventional energy sources. The major available renewable energy sources are sunlight, wind energy and Fuel Cells. In this work Fuel cells were used as a source of energy for multilevel inverters instead of DC sources. Multilevel converters are very interesting solution for medium and high voltage applications, due to its characteristic to synthesize a sinusoidal voltage from several DC levels. The better topology for power quality and transmission system applications is the cascaded multilevel inverters. However, this topology presents a problem that consists of use of several DC sources or Fuel cell energy system. Nowadays multilevel inverters have a great relevance in transmission and distribution systems, due to its general structure which synthesizes a sinusoidal voltage in many voltages levels. Multilevel inverters generates an output signal with low THD, because of this the size of the output filter reduces, whose cut-off frequency depends on the modulation technique and the switching frequency used. In addition it can be possible to use PWM modulation over each step staircase voltage, generating a high PWM frequency output. The Topology-I of cascaded H-Bridge multilevel inverter is general type of 11 levels Multi Level Inverter (MLI)