The large-scale integration of new energy stations into the grid has led to increasingly severe broadband oscillation problems. Currently

targeted research on the internal topology structure of new energy stations for wide-band oscillations (WBO) remains insufficient. Therefore

this article studies the propagation mechanism of WBO considering the topological characteristics of the power station. Firstly

the internal short-circuit ratio and voltage distribution non-uniformity of the new energy power station are derived

and the difference in oscillation risk of power generation units at different positions is quantified. Secondly

a propagation model of broadband oscillation “water surface ripples” is proposed

which explains the mechanism of oscillation originating from the feeder end converter and propagating to the entire station and even other nearby stations from three dimensions: electrical distance

multimodal propagation characteristics

and inverter coupling resonance. Finally

simulation cases are used to verify that considering the internal structure

the cumulative electrical distance between multiple units in the station has a significant impact on the short-circuit ratio and voltage distribution between units. The oscillation signal will stimulate the propagation amplification mechanism of adjacent units with similar frequency oscillation modes.