Urtasun Erburu, Andoni

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https://academica-e.unavarra.es/handle/2454/50131

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Urtasun Erburu

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Andoni

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Ingeniería Eléctrica, Electrónica y de Comunicación

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ISC. Institute of Smart Cities

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0000-0003-4744-8964

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88756

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810015

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Author: Dah-Chuan Lu, Dylan × Subject: Small-signal modeling ×

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    PublicationOpen Access
    Control of a single-switch two-input buck converter for MPPT of two PV strings
    (IEEE, 2015) Urtasun Erburu, Andoni; Dah-Chuan Lu, Dylan; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa; Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa
    In this paper, the Two-Input Buck (TIBuck) converter is proposed as the DC/DC stage for photovoltaic (PV) cascaded converters. This converter is attractive for this application because it is cost-effective and reliable and can achieve dual maximum power point tracking (MPPT) with only one power transistor. However, due to the simplified and integrated structure, the nonlinear characteristics of the converter and the two PV arrays complicate the control. By means of a small-signal modeling, the control theme of the two PV voltages is formulated and the effect of the nonlinearities is presented. It is shown that, while fast voltage dynamics are achieved for the first input, the second-input voltage response depends on the second-stage converter control. Simulation and experimental results are reported to validate the theoretical analysis, showing the dual MPPT capability.