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