Abstract: This paper presents modeling and simulation of an impartial Photo-Voltaic (PV) system with upgraded multilevel Inverter using MATLAB/SIMULINK. The filtration of lower order harmonics is a challenging issue. So to reduce the harmonic contents, the level of the output voltage is increased up to 25 levels by proper arrangement of multilevel inverter with reduced number of switches. The model includes a 25 level inverter which claims that the total harmonic distortion (THD) reduced to approximately 3%. The proposed 25 level inverter uses only 12 numbers of switches which is very less than that of diode clamped, capacitor clamped and cascaded H-Bridge multilevel inverter (MLI). The comparative analysis of THD between the two system discussed in this paper says that the THD is increased by introducing the DC-DC converter which is approximately found to be 12% but it is less as compared to the other conventional multilevel inverters used for PV system . It also reduces the rating of the PV cell. The rating of the PV cell is higher in the system when the dc-dc converter is not included
Keywords: Boost Converter, MPP, MPPT, MLI, PV System, THD
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