DC-AC buck and buck-boost inverters for renewable energy applications

In this paper, two types of DC-DC converters with modified structures and different control methods for generating AC output voltage are proposed. In the modified cascaded dual buck inverter, absence of split capacitors leads to increased reliability of the inverter. Also, a new structure is proposed for integrated dual buck-boost inverter. The proposed inverters are capable of obtaining maximum power from solar cells by themselves. To evaluate operations of the proposed inverters, they have been modeled and simulated in PSCAD/EMTDC for different modulation indexes. Simulation results confirm validity and effectiveness of the proposed inverters.