Single-phase grid integrated Photovoltaic inverter for harmonic and reactive power compensation

The paper presents a single phase grid integration of a shunt connected Photovoltaic (PV) generator. The objective of the proposed system is to provide uninterrupted power supply to the load during both strong sunlight as well as at night or at cloudy conditions. The interface between the grid and the PV is carried out through a Voltage Source Inverter (VSI), eliminating the current harmonics and compensating the load reactive power. The DC voltage control of the DC bus capacitor is employed in order to maintain unit power factor operation of the system, irrespective of changes in solar radiation level or due to change in load. The control scheme implemented is based upon single phase p-q theory.