Study of Performance and Issues of Integration of Fixed Speed SCIG Wind Turbines to Power System Grid

Abstract

The selection of the technology used in wind turbine is an essential factor in any operation of building a wind farm. The Fixed speed wind turbine that uses SCIG has some superior characteristics such as it does not require slip rings, robust mechanical design, and due to its operational simplicity, the fixed speed SCIG wind turbine has lower cost as compared to the other types of wind turbines. This thesis work is done to study the performance and issues of fixed speed SCIG wind turbine that works in multi MW range. The studies was done through calculation its power curve and investigate the effects of wind speed at starting and wind gust on the wind turbine and also the rate of change of pitch angle. The study also was through different circumstances and issues at steady state like changes in grid side voltage, re-switching transient, improving power factor, effect of network faults at common coupling point, and the ways to ride through these faults by the assistance of shunt capacitor and using of STATCOM. The multi connections of wind turbines to make a single wind farm with capacity of (36 MW) also studied through the way of starting of all the turbines in the wind farm and also in LVRT method for unsymmetrical faults at PCC point and voltage dip at grid side for duration of (100 ms).