Grid Interactive Inverters

A new scheme for uploading PV generated power to the grid is presented with basic digital and analogue electronics. An auxiliary circuit is needed to sense the grid failure and subsequent restoration so that inverter connection can be re-made with the grid. For a more dependable way to avoid "Islanding" the Sandia voltage shift and the Sandia frequency shift methods are mentioned. The relevant IEEE and IEC standards are also indicated for universal up linking of power.