Abstract

The electric power system continuously faces the problem of low frequency oscillatory stability due to lightly loaded synchronous generators connected to weak grid, variable loads and overloaded tie lines. This paper examines the problem of power system oscillation in the Integrated Nepal Power System (INPS). Furthermore, the potential effect of integration of wind turbine generation is also studied. The points for wind power injection are chosen suitably. The eigenvalue analysis is then run to identify the critical modes of oscillation as well as the participation factor which helps to identify the potential problematic area in INPS with respect to small-signal stability. Moreover, the transient stability is analyzed with the help of time domain analysis. Our study results depict that the integration of doubly fed induction generator (DFIG) has both beneficial and detrimental effects in INPS. All the simulation results are analyzed and validated using the Power System Analysis Toolbox (PSAT).

Keywords: Small-signal stability; Synchronous generator; Wind power penetration; Integrated Nepal power system (INPS)