Encontro de Energia no Meio Rural

Abstract

MONTEIRO, Luis Guilherme and ZILLES, Roberto. Estratégias de controle de carga em pequenos sistemas fotovoltaicos. In Procedings of the 5th Encontro de Energia no Meio Rural, 2004, Campinas (SP) [online]. 2004 [cited 09 October 2024]. Available from: <http://www.proceedings.scielo.br/scielo.php?script=sci_arttext&pid=MSC0000000022004000100055&lng=en&nrm=iso> .

Considering the necessity to optimize and to draw out the useful life of the rechargeable batteries in photovoltaics systems it is of custom to endow the systems with an equipment that plays this function. Its application, of adjusted form, can represent a significant reduction in the operational costs of these systems. In this paper the different strategies, and its particularitities, used for the management of the state of charge are presented in small photovoltaics systems. In general, this management is made through the scan of voltage in the terminals of the accumulator with an electronic device called charge controller. The market offers a diversity of options for the designer of systems, that essentially vary in that refer to the strategy of commutation of the consumption and load circuits (for example, ON/OFF or PWM). The majority of the controllers for small systems does not allow to adjustment of the points of performance of the circuits of load and consumption. In many cases it is observed that the pre-adjusted points allow extreme discharges that make it harmless to one of functions that would have to play, or either, to protect the battery of extreme discharges. In this direction, this article makes an analysis of the different strategies of control and presents one criticizes to the products offered in the market for application in solar home systems.

Keywords : controladores de carga; regulação; pontos de ajuste.