Publication:
Adaptive voltage control of the DC/DC boost stage in PV converters with small input capacitor

Date

2013

Director

Publisher

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

Project identifier

Abstract

In the case of photovoltaic (PV) systems, an adequate PV voltage regulation is fundamental in order to both maximize and limit the power. For this purpose, a large input capacitor has traditionally been used. However, when reducing that capacitor size, the nonlinearities of the PV array make the performance of the voltage regulation become highly dependent on the operating point. This paper analyzes the nonlinear characteristics of the PV generator and clearly states their effect on the control of the DC/DC boost stage of commercial converters by means of a linearization around the operating point. Then, it proposes an adaptive control, which enables the use of a small input capacitor preserving at the same time the performance of the original system with a large capacitor. Experimental results are carried out for a commercial converter with a 40 μF input capacitor, and a 4 kW PV array. The results corroborate the theoretical analysis; they evidence the problems of the traditional control, and they validate the proposed control with such a small capacitor.

Description

Keywords

Adaptive control, Photovoltaic converters, Photovoltaic power systems, Small-signal modeling, Voltage control

Department

Ingeniería Eléctrica y Electrónica / Ingeniaritza Elektrikoa eta Elektronikoa

Faculty/School

Degree

Doctorate program

item.page.cita

A. Urtasun, P. Sanchis and L. Marroyo, "Adaptive Voltage Control of the DC/DC Boost Stage in PV Converters With Small Input Capacitor," in IEEE Transactions on Power Electronics, vol. 28, no. 11, pp. 5038-5048, Nov. 2013. doi: 10.1109/TPEL.2013.2240702

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