Utility Grid Interfaced Solar Water Pumping System Using PMSM Drive

This work presents a solar photovoltaic (PV) array fed grid interfaced, encoder-less, permanent magnet synchronous motor (PMSM) based solar water pumping (SWP) system. This system mitigates the intermittency issues associated with the solar PV energy. In the presence of grid, the SWP system provides an uninterrupted water flow irrespective of available solar insolation. In condition of grid failure, the output water flow is a function of available solar insolation. A boost converter is used on the grid side to facilitate power transfer from the grid and enabling the unity power factor (UPF) operation using unit vector template (UVT) theory. The speed of the PMSM, is regulated using sensor-less vector control. A double second order generalized integrator quadrature signal generator (DSOGIQSG) is used for extracting the fundamental signal from the distorted grid voltage. Performance of the proposed system is validated using a laboratory developed prototype under varying solar insolation, during grid failure, during voltage sag, voltage swell and distorted grid voltage conditions.