A model-based decoupling observer to locate forced oscillation sources in mechanical power

In this paper, a method is proposed to locate the forced oscillation source, which is often resulted from a continuous disturbance on unit's mechanical power. By judiciously designing a Luenberger observer using an eigenstructure assignment, the relationship between outputs of observer and disturbance in mechanical power of a unit is decoupled. The introduced observer cannot only locate the forced oscillation source in mechanical power, but also estimates the amplitude of the oscillation source. Simulation results of the 19-machine 118-bus test system demonstrate the effectiveness of the proposed method.