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This paper presents a modular cascaded H-bridge multilevel photovoltaic (PV) inverter for three-phase grid-connected applications. The modular cascaded multilevel topology helps to improve the efficiency and flexibility of PV systems. The main abstruse is the harmonization of the DG to the utility grid. Generally current regulated PWM voltage-source inverters (VSI) are used for synchronizing the utility grid with DG source in order to meet the following objectives: 1) To ensure grid stability 2) active and reactive power control through Fuzzy Logic and PI controller 3) power quality improvement (i.e. harmonic elimination) etc. For three-phase grid-connected applications, PV mismatches may introduce unbalanced supplied power, leading to unbalanced grid current. To solve this issue, a Fuzzy logic control scheme with modulation compensation is also proposed. In this paper, fuzzy with PI controller is proposed to enhance the power quality by diminishing voltage and current error. The studied system is modeled and simulated in the MATLAB/Simulink environment and the results obtained are compared with conventional PI Controller

A GRID CONNECTED PV SYSTEM INTEGRATED THROUGH MULTILEVEL MODULAR CASCADED H-BRIDGE INVERTER BY USING FUZZY LOGIC CONTROLLER