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

Author

Urtasun, Andoni ; Lu, Dan

Author_Institution

Dept. of Electr. & Electron. Eng., Public Univ. of Navarra (UPNA) Pamplona, Pamplona, Spain

fYear

2014

fDate

Sept. 28 2014-Oct. 1 2014

Firstpage

1

Lastpage

6

Abstract

In this paper, the configuration composed by a Two-Input Buck (TIBuck) converter and a boost inverter is proposed for low-voltage grid-connected PV systems. This configuration is attractive for this application because it has high efficiency and can achieve dual maximum power point tracking (MPPT) with only one active switch. However, in this system, 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. Simulation results are reported to validate the theoretical analysis, showing the dual MPPT capability.

Keywords

invertors; maximum power point trackers; photovoltaic power systems; MPPT; PV arrays; PV strings; TIBuck converter; boost inverter; low-voltage grid-connected PV systems; maximum power point tracking; single-switch two-input buck converter control; small-signal modeling; two-input buck converter; Australia; Educational institutions; Inverters; Resistance; Switches; Transfer functions; Voltage control;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Engineering Conference (AUPEC), 2014 Australasian Universities

Conference_Location

Perth, WA

Type

conf

DOI

10.1109/AUPEC.2014.6966544

Filename

6966544