Renewable Energy Fed Pumping Motor Drive Using Modified Buck Converter

The widespread adoption of renewable energy resources has prompted to modify the existing systems, resulting it to be environmentally friendly and cost-effective with enhanced performance.This paper deals a water pumping system equipped with a battery back-up using an integrated charging system wherein, a modified DC-DC (buck) converter has been proposed for reliable operation.Proposed converter topology uses a minimal component count offering a variation of DC link voltage in a wide range (buck operation).Further, in the system, a three-phase induction motor is used as a pumping motor whose drive unit has been operated by employing the concept of indirect field oriented control (FOC) for enhanced performance.Developed system has been operated and investigated by using the simulation platform of Matlab/Simulink.It has been found that the magnitude of harmonics in the output of proposed converter topology is relatively low resulting in smaller switching losses.Hence, the diminished harmonic effect leads to an improved efficiency of the system using the proposed converter.