Design and implementation of T-type three level inverter based grid-connected PV system

Abstract

Due to its intermittence, strong dependability on the climate conditions, penetration of PV plants to grid utilities is a big challenge for the power system operators. This project is intended to design and implement a three-phase grid-connected PV system. Two controllers will be developed namely the Golden Section Search (GSS) –based MPPT and the SVM for the three level T-type inverter being used as interface with the Gird. The MPPT algorithm ensures maximum power extraction from the PV generator and the SVM ensures the requirements of grid connection standard in terms of power quality. Phase locked loop (PLL) is used to lock the grid phase and frequency and to eliminate the high frequency ripples and reduce the THD at the inverter output an LCL filter is used.