Generator Damping Evaluation Considering Different Forced Oscillation Sources

The frequency range of forced oscillation is wide distributed due to various types of disturbances, thus the evaluation of generator damping under different forced oscillation is crucial for the stable operation of modern power system. This paper is intended to explore the damping characteristics of generator under forced oscillation with different oscillation frequencies. Firstly, the energy dissipation of the generator was analyzed based on the oscillating energy flow method. Secondly, the energy dissipation of generator components such as excitation control system, governor control system and other windings of the generator was further investigated. Finally, three scenarios considering internal or external disturbance locations were tested in the dual-machine system to explore the energy dissipation variation of each generator component at different frequencies. Simulation results show that the generator with disturbance inside may provide positive damping at a certain frequency, however, the energy emitted by the source device is much larger than other non-source device, which can be used as an indication for the precise location of oscillation source.