[Kadam, 3(3): March, 2014] ISSN: 2277-9655 Impact Factor: 1.852 http: // www.ijesrt.com(C)International Journal of Engineering Sciences & Research Technology [1333-1336] IJESRT INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY Voltage Swell mitigation in Wind Farm System Kadam D.P *1 , Dr. Kushare B.E. 2 *1,2 Department of Electrical K. K. Wagh Institute of Engineering Education and Research, Nashik (MS), India dpkadam@gmail.com Abstract As the wind power penetration into the grid is increasing quickly, the influence of wind turbine on the power quality is becoming an important issue. Wind power penetration is the impact on power system stability. Power quality problems such as voltage sag and swell are some major concern. In this paper voltage swell issues is analyzed. Wind turbine connected to squirrel cage induction generator is modelled using PSCAD simulation software to analyse the said issues where STATCOM is introduced as an active voltage and reactive power supporter to increase the power system stability. STATCOM unit is developed to inject reactive power for mitigation of power quality problems and to get stable grid operation. Keywords: Squirrel Cage Induction Generator (SCIG); PSCAD; Wind Turbine Generator (WTG); Static Synchronous Compensator (STATCOM); Power Quality. Introduction Wind power penetration is the impact on power system stability. To facilitate the investigation of the impact of a wind farm on the dynamics of the power system to which it is connected, an adequate model is required. In order to avoid the necessity of developing a detailed model of a wind farm with tens or hundreds of wind turbines and their interconnections, aggregated wind farm models are needed [1]. From each generating station the probability of the total generating capacity not exceeding a given power level. This gives a measure of the reliability of the system [2].If the network is weak this situation will cause a voltage collapse to occur in the transmission system. The process can be dynamically supported by a STATCOM to improve voltage stability and to improve recovery from network faults and mitigate voltage flicker [3]. Frequently wind parks are connected to weak systems, as they are typically located far from major load centres and central generation. This reflects itself in the short circuit ratio (SCR) of the interconnection. For weak systems the SCR will usually be less than 6 having over speed of generator [4].Reactive power is the most important aspect in today’s condition. Reactive power consumption in a Wind farm is mainly due to the use of induction generators for energy conversion. The basic principle of induction generator is that they consume reactive power in order to generate real power. The magnetizing currents drawn by step up transformers also contribute to reactive power consumption to some extent. This reactive power consumption leads to increased T & D losses, poor voltage profile over loading of T & D equipment and blocked capacity and over loading and reduction in life of T & D equipment [5].Issue related to fixed speed wind turbine equipped with squirrel cage induction generators is the fault ride through capability. When connected to a weak power grid and during a grid fault, the over speeding of the wind turbines can cause voltage instability. As a result, utilities typically disconnect the wind turbines immediately from the grid when such a contingency occurs. With the rapid increase in penetration of wind power in power grids, tripping of many turbines in a large wind farm during grid faults may begin to influence the overall power system stability [6]. Today India is a major player in the global wind energy and as compared to develop countries Indian grid system is very weak also having poor infrastructure. Considering the increasing share of wind generation interfaced to grid it is necessary to study an overall prospective on various types of existing wind generator systems and possible generator configuration, critical power quality issues, problems related with grid connections [7].Use of more intelligent controller for STATCOM and its interface to large power systems addressing various issues such as security, stability, and voltage profile improvement and power quality [8].It was found that