Impact of Load Modeling on Power System Oscillations

Load modeling plays an important role in power system simulation studies. As the system loads evolve, load modeling communities worldwide are working to refine existing models as well as develop new models. In addition to the fault responses, the system loads also affect the ensuing interarea oscillations. The ability of a transmission planner to predict the damping of a future power system with changing loads depends greatly on how the load is modeled in transmission planning studies. This paper explains the mechanism of the impact of loads as well as load modeling on the electromechanical oscillations using a phasor approach and highlights how the changing load as well as the load modeling assumptions can play a big part in the ability of a planner to gauge the impact of loads on these oscillations.