Optimization of Topology in a Microgrid Using Modified Multilevel Inverter

In a microgrid, the utilization of an inverter of higher level reduces the harmonics and allows the removal of bulk filters. Conventional topologies use a large number of electrical components with an increase in the complexity of the inverter, such as size and cost. The modified topology requires an isolated DC sources and switches for each H-bridge; thus, the multilevel inverter contributes the possibilities of interfacing solar and wind renewable sources, as well as the combination of hybrid that results in higher output power and voltage. Different levels in the output voltage are generated by changing the structures of the topologies. A detailed study and simulation is carried out analytically using MATLAB/Simulink. Simulations regarding magnitudes of total harmonic distortions produced by the harmonic components that are present in AC output voltage are carried out. The techniques such as MCPWM, SPWM, NLC are implemented to obtain reduced THD. The modified multilevel inverter with the implementation of any type of topologies in the microgrid uses proper filters to reduce the harmonics. For the verification of simulated results, a laboratory prototype of a single-phase Solar-PV and battery-based microgrid using the asymmetrical modified multilevel inverter of topology has been developed.