IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) e-ISSN: 2278-1676,p-ISSN: 2320-3331, Volume 7, Issue 5 (Sep. - Oct. 2013), PP 52-58 www.iosrjournals.org www.iosrjournals.org 52 | Page A Svc Light Based Technique for Power Quality Improvement for Grid Connected Wind Energy System D. Shobha Rani 1 , Md. Mahaboob 2 , Md.Asif 3 ,P.Harika 4 1,2,3,4 (Department of EEE, Vardhaman College of Engineering (Autonomous), JNTU Hyderabad, India) Abstract : The power produced from wind energy source is always fluctuating due to variation in the wind. Connecting this wind sources to grids leads the system to issues , and shows the impact on the functionality of the grid to be impaired. Thus wind power injection in to an electric grid affects the quality of power.. This project deals the existence of the power quality problems due to the installation of wind turbine with grid. In order to eliminate these power quality problems, this project proposes a scheme based on FACTS device called SVC light which is connected at a Point of Common Coupling. The proposed model is compared with the model that do not use any compensating device .Performance of the system with BESS under load variations and Fault ride through capability of the svc light is also analysed. This control scheme for the grid connected wind energy generation system is to improve the power quality and this system is simulated using MATLAB /SIMULINK in power system block set. Keywords: Power Quality, Wind Generating System (WGS), Svc light, Statcom, and Fault ride through capability, Battery energy storage system (BESS). I. INTRODUCTION The wind power generation is asynchronous, and it is robust and cheap. Asynchronous generators, will not contribute to regulation of grid voltage, and they are substantial absorbers of reactive power. variations in the wind turbine, electrical power on the grid and leads to large voltage fluctuations. The power quality problems can be viewed with respect to the wind generation, transmission and distribution network, such as voltage sag, swells, flickers, harmonics etc. The wind generator introduces disturbances into the distribution network... However, induction generators require reactive power for magnetization. Main requirements involve:  Reactive power supply,  Fault ride-through capability,  Voltage control,  Power quality control (flicker, harmonics),  Frequency control Some or all of which may require FACTS at the PCC to satisfy the demands . A proper control scheme in wind energy generation system is required under normal operating condition to allow the proper control over the active power production. A svc light based control technology has been proposed for improving the power quality which can technically manages the power level associates with the commercial wind turbines. The proposed Svc light control scheme for grid connected wind energy generation for power quality improvement has following objectives. • Unity power factor at the source side. • Reactive power support only from svc light to wind Generator and Load II Power Quality Problems 2.1 Voltage fluctuations: The voltage fluctuation problems results from the wind speed and generator torque. The voltage variation is directly related to active and reactive power variations. The voltage variation can be: • Voltage Sag/Voltage Dips. • Voltage Swells. The voltage flicker issue specifies dynamic variations in the network caused by wind turbine. Thus the power fluctuation from this turbine occurs during continuous operation. The magnitude of voltage variation depends on grid capacity , network impedance,phase-angle and power factor of the wind turbines. It is defined as a fluctuation of voltage in a frequency 10–35 Hz.