A Modified P&O Technique for Solar based EV Charging with SEPIC

Solar Power Generation is being done extensively across the globe. The solar irradiation is variable with time and the irradiation change can be easily observed form sunrise to sunset. So there is a need to operate the PV panel at the maximum power operating point and this can be easily done using P&O technique. P&O algorithm may take an incorrect decision when the insolation increases or decreases and a shift occur in the tracking. The duty cycle has to be corrected when change in insolation occurs so that we can reduce the shift. To achieve this, an improved P&O technique using changes in current is proposed in this paper. A Single Ended Primary Inductance Converter (SEPIC) is used in the paper to implement this technique. The SEPIC Parameter calculations are also presented in this paper. The simulation results on traditional and improved P&O techniques showed that the proposed technique has better tracking and shift reduction. The simulation is performed in MATLAB/Simulink environment. The model proposed in this paper can be used for charging the batteries.