Author : B.Venkata Rao 1
Date of Publication :7th September 2016
Abstract: In series connected Photo Voltaic (PV) modules (string), there is a higher possibility of mismatch of currents among modules during partial shading conditions. In order to overcome this problem various DMPPT (Distributed Maximum Power Point Tracking) architectures are studied and PV to Virtual bus DPP (Differential Power Processing) architecture is considered in this paper. The proposed technique is used for the extraction of maximum power from series connected modules under shading conditions. The MPP (Maximum Power Point) voltage values of all modules are obtained by using Resonant MPPT method. These MPP voltage values are given as reference voltages to the Bi-directional fly-back DC-DC converters, which are placed in parallel to each PV module. These converters are used for operating each module at their MPP by providing required compensation currents to the shaded modules in PV to Virtual bus architecture.
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