MPPT schemes for single-stage three-phase grid-connected photovoltaic voltage-source inverters

Single-stage grid-connected PV systems provide many advantages such as simple topology, high efficiency, high power density, and lower cost. However, achieving MPPT, while conditioning the output power and synchronizing with the power grid, is a big challenge in such systems. In this paper two MPPT schemes are investigated for single-stage three-phase grid-connected photovoltaic voltage-source inverters. MPP is tracked using either the load angle or the inverter modulation index.