LC Filter Using Phase-Shifting Technique to Reduce Total Harmonic Distortion (THD) in Grid-Connected PV Systems

Recently, researchers are focused on photovoltaic (PV) energy as it has the potential to produce clean electricity and people are seeing it as an alternative to the energy produced by fossil fuels. People understand the importance of multilevel inverter, though still various issues regarding the application in PV must be tackled. The major one is connection to grid. The key point is high total harmonic distortion of grid current (ig). This paper employs a PSPWM strategy, along with a phase-shifted MPPT algorithm featuring an LC filter and a multilevel H-bridge inverter configuration, with the aim of minimizing total harmonic distortion. The findings show that using this technique with the right value choice dedicated to the LC filter proposed and a suitable system controller allows a very significant reduction of the total harmonic distortion in current of grid (ig). The resulting inverter output waveforms are illustrated and Compared Based on the current of grid (ig) total harmonic distortion (THD). Every one of the setups we simulated in MATLAB Simulink.