Open AccessStudy on Fault and Isolated Condition in Two Circuit Configurations of PV-ESS Hybrid System
Author(s) -
Myo Htaik,
Ryoichi Hara,
Hiroyuki Kita
Publication year - 2012
Publication title -
isrn renewable energy
Language(s) - English
Resource type - Journals
eISSN - 2090-746X
pISSN - 2090-7451
DOI - 10.5402/2012/863813
Subject(s) - photovoltaic system , microgrid , fault (geology) , electrical engineering , computer science , distributed generation , grid connected photovoltaic power system , voltage , grid , reliability engineering , electronic engineering , engineering , automotive engineering , maximum power point tracking , renewable energy , inverter , mathematics , geometry , seismology , geology
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.
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