High Efficient Maximum Power Point Tracking with The Peak-Current-Mode-Controlled Interleaved SEPIC with Coupled Inductor
Onur BIYIKLIOĞLU Murat Ünlü Sabri Çamur
AbstractA SEPIC (single-ended primary inductance converter) DC-DC converter has become popular in recent years particularly some applications where output voltage may be above or below the converter input voltage. In this paper, the interleaved SEPIC converter with coupled inductors is designed and employed in photovoltaic (PV) system applications for maximum power point tracking. The interleaved SEPIC is constructed as two parallel conventional converter module. Thus, the controller generates two PWM control signals with 180 degrees out of phase. In the designed SEPIC, the peak-currentmode controller is employed to control each inductor current according to inductor current references (IL1 and IL2). The sum of the inductor currents is the input (PV) current. In this study, MPPT process is realized the reference voltage (Vref) generated from MPPT algorithm is directly applied the PI controller, and thus ILref is obtained for peak-current-mode-controller. The system is analyzed for sudden irradiation varying conditions and sudden load change. Simulation results show that the proposed converter is very efficient in the MPPT process and has a fastdynamic response due to the peak-current-mode-controller and the PI controller.