Design of a Bi-directional DC-DC 4 Phase Interleave Converter for PV Applications

This paper presents a design of a bidirectional 4 phase interleave converter specifically for PV applications. The proposed model has rated capacity of 60 to 120 VDC, 1KW. The Design of this DC-DC bidirectional 4 phase interleave converter to investigate the behavior of the system used MATLAB/SIMULINK. The simulation results are observed to determine the output voltage value. The design used FIO controller to decision battery charge or discharge status. The first step is boost converter to transfer power from battery into 120Vdc bus and the second step is working as buck converter to store energy into the battery 60Vdc when no load required. Mathematical models for boost and buck modes are being derived and the Simulink model is constructed in order to simulate the system of both step designs. The results of simulation found that the designed converter is able to charge battery and discharge battery and deliver power to load as designed. The output current is 12A (2.3A per phase) battery capacity of selected Lead-Acid battery per designed is 12Ah.