[Singh*, 4(11): November, 2015] ISSN: 2277-9655 (I2OR), Publication Impact Factor: 3.785 http: // www.ijesrt.com© International Journal of Engineering Sciences & Research Technology [362] IJESRT INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY USE OF BALANCED AND UNBALANCED LOADS BY USING AN ISOLATED W-H HYBRID MODEL WITH POWER CONVERTERS Tapas chhual Singh * , Binay Bhusan Nanda, B. Vikram Anand, Sujit Kumar Patro * Lecturer, Department of Electrical Engineering,GIET Gunupur,Odisha,India Lecturer, Department of Electrical Engineering,GIET Gunupur,Odisha,India Asst. prof, Department of Electrical Engineering,GIET Gunupur,Odisha,India Asst. prof, Department of Electrical Engineering,GIET Gunupur,Odisha,India ABSTRACT In this paper, a new three-phase four-wire load connected to an autonomous W-H(wind –hydro) hybrid system driven by squirrel cage induction generators SCIG, which hasn’t been connecting to the grid and where the wind- hydro potential exist constantly. The control of voltage and frequency (VFC) are the main important. The wind system driven by variable speed generator. This hybrid system utilizes back-to-back-connected, two IGBT based voltage- source converters (VSCs) with a battery at its dc link. This hybrid system has bidirectional flow of active- and reactive power, which maintains a constant frequency across the load irrespective of any types of load like linear and non linear loads. The performance has verified by MATLAB-9/Simulink-SimPower Systems software, KEYWORDS: W-H Hybrid Renewable energy systems, SCIG, VSC, MPPT. INTRODUCTION Renewable energy sources have raised its attention world- wide due to rising prices of limited fossil fuels. Renewable energy source are the best and only replaceable source for fossil fuels and plays an important role in reducing the emissions of harmful gases which are the main causes of greenhouse effect. The need of isolated systems that uses renewable energy sources highly depends on modern simulation based control systems. A renewable energy is a resource which is replaced naturally with some biological effects and can be used again. Examples are: oxygen, fresh water, solar energy, timber, geothermal and biomass. Renewable resources may include goods commodities such as wood, paper and leather. Among the renewable energy sources, small hydro power and wind energy have the ability to complement with each other. As regards wind-turbine, these can be built either as constant-speed machines or as variable speed machines, which rotate at a fixed speed regardless of wind speed for constant speed machine and varies in accordance with wind speed for variable speed. Variable speed machine is having certain advantages. They compensate torque and power pulsations dynamically, reduce mechanical stresses, improves system efficiency and power quality. in fixed-speed wind turbines, energy transformation efficiency is very less for widely varying air flow. So to make it more efficient, technology has implemented from fixed speed turbine to variable speed turbine. The grid connected variable speed WECS based on squirrel cage induction generator SCIG use two power converters with a lead acid battery at its DC link. In such systems reliability improves as power converters decouples the squirrel cage induction generator from the grid. This paper proposed a new three-phase four-wire wind– hydro hybrid system for isolated location. which has not connected to any grid and where the wind and hydro potential exists concurrently. The proposed system uses a variable speed wind-turbine and a constant speed, constant power small hydro electric power driven by squirrel cage induction generator SCIG for both. India ranked 5 th in the world for utilizing such wind power and one such location in india is the Andaman-Nicober islands.