Improved Damping Filter For Grid Connected Solar PV Microinverter

Now a days, non-renewable energy like coal, are depleting because of their limitation and our demand increasing for electricity. Therefore, we need to change our usage to renewable energy like wind or solar energy. H-bridge single phase grid connected PV-microinverter is used as interface between solar panel and grid, LCL filter acts as interfacing element between them. LCL filter is having many advantages but there is resonance of it with the grid current. This may cause stability problems in the PV- microinverter, to improve the quality of PV-microinverter must reduce the THD of grid current, this happens when it used the LCL filter, this is so high more than the IEEE standard of power system (must be smaller than 5%). (R//LC) passive damping filter is proposed in this paper to reduce resonance peak at resonant frequency and total harmonic distortion THD of grid current for the grid-tied PV microinverter. There are many methods to solve this problem, we have used (R//LC) passive damping filter, this method makes microinverter not complex and to minimizing the total power losses to reach high efficiency of PV-microinverter, which is the main goal of this study. MATLAB/Simulink simulation results are shown the performance of (R/ ILC) passive damping topology.