PV Injection System with Third Harmonic Compensation based on H-Bridge Topologies

The need to decarbonate the planet, due to the massive use of fossil energy, has led to turn to employ renewables energies in many applications. Among the most common energy sources are the wind, solar, and sea, being one of the most relevant the solar energy, particularly in some countries as Chile. To transport the energy, solar system must be connected to a middle voltage level lines and therefore different topologies have been proposed where some of them are based on H-Bride. This work presents the use of H-Bridge power converters connected in parallel in the dc side and connected to a transformer in the ac side to pump up to middle voltage level. Additionally, as all phases of the H-Bridge are connected in parallel in the dc side, the third harmonic, typical of this topology, is compensated and therefore the ac waveform results free of low frequency harmonics. To get the maximum power from the solar array, it is employed a maximum power point tracker which uses measuring cells, avoiding oscillations around the maximum power point. The results show the feasibility of the proposal.