Fast dynamic response of SEPIC converter based photovoltaic DC motor drive for water pumping system

In this paper, a SEPIC converter designed for Photovoltaic water pumping system. This type of model avoids use of extra converter and use of battery which reduces the cost of whole system. The Solar water pumping system has becoming more popular in recent years. Photovoltaic (PV) cell having non linear P-V characteristics, it varies with changing solar radiation. Maximum power point tracking (MPPT) algorithms are used to track the peak power point, which helps to improve the efficiency of the system. The MPPT algorithms are incorporated with DC-DC converter which helps to track the MPP of PV cell. The Advantage of SEPIC converter is reduce the ripple at the output stage and also gives the same polarity as input polarity, which feeds the DC motor, so that the motor runs smoothly without any jerking moments, therefore life the DC motor will be increased. The proposed system is tested with different insolation conditions by changing the solar radiation and observed the DC motor characteristics. The P&O algorithm is used to track the MPP point according to changes in solar insolation and tested using MATLAB SIMULINK model and observed all the results.