In this paper, a comparative study of various standalone and grid connected hybrid systems is done and analyzed. The hybrid system consists of wind, mini hydro, solar, fuel cell, biogas plants along with diesel generator as a backup source. The comparison between standalone and grid connected systems is done in detail. Various hybrid systems incorporate different controlling strategies for wind farms, hydro turbines, conventional generators etc. are also included. An in-depth study of hybrid system comprising of wind and hydro turbines connected to conventional generators is also done. Islanding operation is also considered a special concern in this paper, which also include various works by hydraulic turbine and controller of governor system in smart distribution systems.

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Distributed Generation (dg) Doubly Fed Induction Generator (dfig) Hybrid Systems Hydraulic Turbine And Governor (htg) Renewable Energy Sources (res) Small Hydro Power Plant (shpp) Wind Turbine (wt)