Publication:
Control of a single-switch two-input buck converter for MPPT of two PV strings

Date

2015

Authors

Dah-Chuan Lu, Dylan

Director

Publisher

IEEE
Acceso abierto / Sarbide irekia
Artículo / Artikulua
Versión aceptada / Onetsi den bertsioa

Project identifier

Abstract

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.

Description

Keywords

Dual MPPT, Photovoltaic power systems, Small-signal modeling, Two-input converters, Voltage control

Department

Ingeniería Eléctrica y Electrónica / Ingeniaritza Elektrikoa eta Elektronikoa

Faculty/School

Degree

Doctorate program

item.page.cita

A. Urtasun and D. D. Lu, "Control of a Single-Switch Two-Input Buck Converter for MPPT of Two PV Strings," in IEEE Transactions on Industrial Electronics, vol. 62, no. 11, pp. 7051-7060, Nov. 2015. doi: 10.1109/TIE.2015.2432097

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