Design and implementation of solar pumping system with induction motor and submersible pump

Abstract

Solar Water Pumping System (SWPS) is becoming increasingly popular in remote areas where grid is not available or unreliable. This system is mainly used for irrigation purpose in farming and household purposes. In the proposed system, induction motor along with submersible pump of 1.5 kW is used. On the basis of motor rating, solar panel rating is decided to be 1.8 kW considering losses in the system. In this paper the main focus is to design boost-converter which boosts the voltage obtained from solar panel. This boost voltage acts as a dc-link voltage for three-phase inverter. Three-phase inverter is developed to convert dc voltage into ac voltage. This ac voltage generated is given to induction motor which runs the submersible pump. Maximum Power Point Tracking (MPPT) algorithm is implemented to obtain maximum power from the solar panel under different solar irradiation and temperature. In this topology, incremental conductance method is used to obtain maximum power from solar panel. Modulation index of inverter is controlled by Sine-Triangle Pulse Width Modulation (SPWM) technique. SPWM along with V/F scheme is implemented for the control of inverter which results in the control of speed of induction motor when the output from solar panel changes. Design and simulation verification of the system is performed in PSIM software. After satisfactory results obtained through simulation studies, hardware setup is also tested on resistive load.