Grid Connected Multilevel Inverter for Renewable Energy Systems

This paper emphasis on Grid connected multilevel topologies for single-phase converters, Multilevel topologies allow to reduce the harmonic content of the converter output voltage, allowing the use of smaller and cheaper output filters. Moreover, these topologies are usually characterized by a strong reduction of the switching voltages across the switches, allowing the reduction of switching losses and electromagnetic interference (EMI). The main objective of this paper is a novel five-level inverter based on a full-bridge topology with diodes connected to the midpoint of the dc link to balance the midpoint voltage, an intelligent controller like a specific fuzzy logic PWM strategy to be developed to keep the output voltage being sinusoidal and to have the high efficient performance. This solution is opted for renewable energy systems, like where unity power factor operations are commonly required. This model circuit realized in MATLAB-SIMULINK software and Simulation results illustrate the effectiveness of the proposed solution.