首页|A current-source DC-AC converter and control strategy for grid-connected PV applications
A current-source DC-AC converter and control strategy for grid-connected PV applications
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NETL
NSTL
Elsevier
This paper presents a two-stage current-source DC-AC converter for grid-connected PV applications which is composed of an input step-up stage, followed by a step-down stage and an unfolding inverter. A decentralized control strategy of the DC-DC stage allows maximizing the renewable energy harvest using an Incremental Conductance MPPT algorithm and synthesizing an output current to be injected into the grid with low harmonic distortion. Double-loop PI controllers are used for the boost stage. The DC bus voltage of the buck stage is regulated using a PI controller, and an inner Proportional-Resonant (PR) controller tracks a sinusoidal reference. The PR controller proposed in this paper, includes a reduced number of resonant stages meeting the energy quality required by standards, which results in good stability margins. Finally, a SOGI-FLL algorithm synchronizes the inverter operation with the grid. Experimental results show an excellent dynamic response of the system, and the injected current complies with the IEEE Std. 1547-2018 specifications regarding harmonic content using a control law with a low computational burden.
PV power conversion systemBoost-buck converterGrid-tie inverterPulse-width modulationPR Controller
Christian Buzzio、Yamil S. Poloni、German G. Oggier、Guillermo O. Garcia
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Instituto de Investigaciones en Tecnologias Energeticas y Materiales Avanzados (IITEMA), Universidad Nacional de Rio Cuarto, CONICET, Rio Cuarto, Cordoba,Argentina
NETL
NSTL
Elsevier
