Small Signal Stability of Power System with SCIG, DFIG Wind Turbines

Abstract

Voltage stability issue is a key problem which attracting worldwide attention because voltage stability may leads to voltage collapse. This paper investigates the impact of Squirrel Cage induction generator (SCIG) and Doubly Fed Induction Generator (DFIG) on the power system small signal stability. Here considered wind generators are SCIG which is fixed speed and DFIG is variable speed. Small signal stability study has been conducted on a modified IEEE 14 bus system with SCIG, DFIG wind turbine systems and their simulation results have been analyzed in this paper. Fixed speed wind generators are more simple to operate and reliable but they are limited as energy output of a wind turbine and stability issues are consider. Variable speed wind generators of similar rating improve stability of the system. All these modeling’s, simulations have been done in Power system Analysis Toolbox (PSAT), which is a MATLAB based toolbox to evaluate power system.