Photovoltaic water pumping system using maximum power point tracking

摘要

The main objective of the paper is to design a photovoltaic water pumping system with an easier and feasible MPPT algorithm. As we know the output power from the PV arrays is sensitive to solar irradiance and temperature changes, so it has become necessary to operate the photovoltaic (PV) system at the maximum power point (MPP) so that maximun power can be harnessed from the solar panel. The paper presents an Open voltage (OV) scheme for extracting the maximum power from a PV system for use in a water pumping system. A buck converter is used with feedback PI controller which adjusts the duty cycle of buck converter to match the load impedance to the PV panel, consequently maximizes the motor speed and water discharge rate of the centrifugal pump. The performance of the OV method is evaluated and modeled in SIMULINK environment of MATLAB to confirm the significance of its power improvement and efficient technique for water pumping system.