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A modified maximum power point tracking control technic for an off-grid photovoltaic system which include the interleaved hybrid DC-to-DC boost converter was presented in this paper. The input voltage was predicted by measured one branch current of the proposed hybrid DC-to-DC boost converter. The proposed control technic consists of maximum power point tracking with the predicted input voltage and PI controller. Thanks to the proposed control technic, the photovoltaic panel was forced to operate at maximum power point and the output voltage of the proposed converter ensured the desired value despite the varying input power. In addition, the interleaved hybrid DC-to-DC boost converter was increased the low output DC voltage of photovoltaic panel to the desired high voltage value and the stresses on the circuit elements was decreased by reducing the input current ripples. As a conclusion, the total cost of the proposed system is reduced by eliminating the sensing of the input voltage and the service lifespan of the proposed system is extended by using the interleave hybrid DC-to-DC boost converter. The simulation and experimental results of the proposed system were obtained by using MATLAB/Simulink and 400 W DSP TMS320F28379D based porotype, respectively.

The Modified MPPT for PV System with Interleaved Hybrid DC-to-DC Boost Converter