This paper proposes a dynamic power decoupling (DPD) strategy for the three-phase grid-tied PV power system without increasing the dc-link capacitance. Under normal condition, the interleaved boost converter will extract the maximum power point (MPP) from the PV array and the three-phase inverter will inject the power to the grid. During the unbalanced grid fault scenario, the input power and current of the interleaved boost converter will be controlled by the proposed DPD to achieve the power decoupling capability as well as to eliminate the dc-link voltage oscillation. The proposed work has been carried out in MATLAB, and the results are presented.
DPD, Two stage PV system, MPPT controller
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