An Uninterruptable Solar Water Pumping System Based on RelSyRMD with Multiple Power Sources

Abstract

This paper examines a two-stage solar-powered water pumping system operated by a reluctance synchronous motor drive (RelSyMD) with the grid integration. This configuration also focuses on smart sharing of the power between solar PV array and grid supply. It consists of a bidirectional voltage source converter instead of a diode bridge rectifier, which also feeds power from DC link to the grid. Moreover, an intermediate DC-DC converter is used for optimization of PV array power, so that in spite of change in insolation, the DC link voltage is kept constant. When there is no need for water pumping, or if the power of the PV array exceeds the need of the pump, this system allows farmers to profit financially by feeding excess power to the grid. The system is simulated and modeled in the MATLAB environment. There are four distinct modes of operation recognized based on the availability of power sources and sun radiation. The response of the system in these operating conditions is simulated and results are presented in this work.