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Modeling and control of grid-connected photovoltaic systems for 100 Hz oscillations mitigation

In grid-connected Photovoltaic (PV) applications, DC-links based on large electrolytic capacitors are used to attenuate voltage oscillations caused by the sinusoidal power injection into the grid, where the electrolytic capacitors introduce reliability problems. This paper proposes the unified modeling of the complete PV system in typical grid-connected operation conditions to design control strategies that mitigate the DC-link voltage oscillations as well as irradiance disturbances caused by environmental perturbations, it making feasible the use of non-electrolytic capacitors. The developed control strategy has been associated with a maximum power point tracking technique to maximize the power produced by the PV panel, evaluating the system performance using analytical and simulation results.