Grid connected PVs & Wind Turbine with a wide range of reactive power control and active filter capability

The paper presents a two-stage, single-phase power converter system fed from PV and Wind Turbine energy sources, and a new control methodology for transferring the output power to the grid, leading to reduce harmonics in the grid current, and controlled power factor. The proposed control depends on comparing the total power from the renewable energy sources with the power required to supply the nonlinear load, leading to a controlled distribution of power requirement from the sources. A key outcome of the paper is that excellent power factor and good harmonic reduction is obtained from the perspective of the grid, with no requirement for an intermediate battery due to the inherent ability to provide leading reactive power to the grid when necessary. Simulation and experimental results are used to support the proposed control methodology.