TRANSIENT STABILITY IMPROVEMENT OF A GRID CONNECTED PERMANENT MAGNET SYNCHRONOUS GENERATOR BASED WIND FARM

Abstract

Among all available wind energy conversion systems (WECS), the direct driven permanent magnet synchronous generator (PMSG) variable speed WECS integrated with power electronic interfaces is considered to be the best choice for the current energy market due to its capability of extracting optimal energy capture, reducing mechanical stresses. It doesn't need external excitation current, which means less losses and more compact size. Its simple structure, Low cost maintenance also, decoupling control implementation makes it less sentient to the parameter changes of the generator. The performance of wind energy system is influenced by many factors such as the characteristics of the turbines, generators and control systems. One of the important functions of the control systems is to determine the active and reactive powers supplied by the wind turbine to the grid. Conversely, the performance of the WECS is affected by the variation of the varying grid condition.