Energy-efficient single-stage solar PV powered sensorless PMSM drive for water pumping

Abstract

This work presents a speed sensorless permanent magnet synchronous motor (PMSM) drive for single-stage solar photovoltaic (PV) powered water pumping. The elimination of speed sensor reduces the system cost and improves the system robustness. The estimation of rotor speed and position is achieved through estimation of stator flux from voltage and current in stationary reference frame. Conventional maximum power point technique uses two sensors for PV array voltage and current sensing. In the presented work, an effort is made to eliminate the PV array current sensor without compromising the system performance. The proposed system is modelled and its performance is simulated in MATLAB/Simulink. The experimental performance is validated on a developed laboratory prototype using a digital signal processor (DS-1202). A comprehensive comparison is made to validate the significance of the proposed work.