Influence of wind energy integration on low frequency oscillatory instability of power system

The ever-increasing trend of extracting electrical power from renewable resources is encouraging addition of more and more wind generation to the grid. However, the integration of added wind generation is compromising the stability of the system as wind generation technologies differ from that of conventional generation. Hence, there is an urgent need to investigate influence of various wind generation techniques on the electromagnetic oscillation of the given power system. This paper aims to investigate the same. The variable speed wind turbine with doubly fed induction generator (DFIG), constant speed wind turbine with squirrel cage generator (CSIG) and variable speed wind turbine with direct driven synchronous generator (DDSG) are selected for the study. Simulation models are developed with single machine infinite bus and multi machine system to evaluate local and inter-area mode of the electromagnetic oscillation. The simulation results obtained using the PSAT^® are used to evaluate the impact of different wind generator on the small signal stability.