Isolated Wind-Hydro Hybrid System Using Cage Generators and Battery Storage

Power Generation from Renewable energy sources like wind, solar, geothermal, biomass, and hydro is predominant now days and among the renewable energy sources, small hydro and wind energy have the ability to complement each other. For Power generation by small or micro hydro as well as wind systems, the use of squirrel-cage induction generators (SCIGs) is mostly adopted. As regards in recent years, wind turbine technology has switched from fixed speed to variable speed because of the several advantages like i.e. reduction in mechanical stresses, dynamically compensate for torque and power pulsations, improve power quality and system efficiency. In Modern there are still few many isolated locations which cannot be connected to the grid and where the wind potential and hydro potential exist simultaneously. For such locations , a “ NEW ISOLATED WIND – HYDRO HYBRIDSYSTEM USING CAGE GENERATORS AND BATTERY STORAGE” is Proposed , employing one squirrel-cage induction generator (SCIG) driven by a variable-speed wind turbine and another SCIG driven by a constant-power hydro turbine along with BESS feeding threephase four-wire loads. So the main objectives of the control algorithm for the VSCs are to achieve maximum power tracking (MPT) through rotor speed control of a wind-turbine-driven SCIG under varying wind speeds and control of the magnitude and the frequency of the load voltage. The proposed wind-hydro hybrid system has a capability of bidirectional activeand reactive-power flow, by which it controls the magnitude and the frequency of the load voltage. The design procedure for selection of various components for analyzing performance of the proposed hybrid system has been demonstrated under different electrical (consumer load variation) and mechanical (with wind-speed variation) dynamic conditions. Index Terms — Battery energy storage system (BESS), small hydro, squirrel-cage induction generator (SCIG), wind-energyconversion system (WECS).