Table of Contents
ISRN Renewable Energy
Volume 2012, Article ID 863813, 11 pages
Research Article

Study on Fault and Isolated Condition in Two Circuit Configurations of PV-ESS Hybrid System

Graduate School of Information Science and Technology, Hokkaido University, N14W9 Kita-Ward, Sapporo, Hokkaido 060-0814, Japan

Received 28 December 2011; Accepted 26 January 2012

Academic Editors: E. R. Bandala and L. Ozgener

Copyright © 2012 Myo Htaik et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Most photovoltaic (PV) generation systems are connected with a utility grid and recognized as supplemental generation resources; but in some applications such as microgrid concept, a PV system works as a main resource. To improve the availability of PV systems, technological development for higher less output fluctuation in normal condition, higher fault tolerance in fault occurrence, and power demand and supply balancing in isolated condition are required. For these reasons, hybridization of a PV system and an energy storage system (ESS) would become an important technology in the future. This paper presented two kinds of circuit models, conventional “ac-connected PV-ESS,” and proposed “dc-connected PV-ESS” in which ESS is inserted at the dc-side of PV system. This paper also investigated dc-link voltage controlled by dc-dc converter of ESS in dc-connected PV-ESS and suitable control systems are also discussed normal, during fault occurrence and isolated operation.