With the large-scale integration of renewable energy into the power grid

broadband oscillation accidents in renewable energy stations have occurred frequently. Existing research has mostly focused on power generation equipment such as wind turbines and photovoltaic inverters

while few studies have addressed the issues of oscillations induced by auxiliary devices such as static var generators (SVG)

with a lack of comparative analysis between theory and practical cases. To address this

taking a broadband oscillation event triggered by SVG control mode switching at a photovoltaic station in China in 2024 as the research subject

we conduct studies on oscillation source tracing and suppression. First

the engineering background is outlined

and oscillation frequency analysis is performed based on field recorded waveform data to clarify the actual oscillation characteristics. Next

the experimental platform and impedance measurement device used for oscillation analysis are introduced

along with the system wiring configuration and measurement procedures. Subsequently

combined with frequency-domain analysis and time-domain simulation

the oscillation source is progressively identified at the station level and equipment level. Finally

based on the tracing results

control parameters of the oscillation source equipment are optimized

and oscillation suppression is achieved through impedance reshaping

thereby addressing the practical engineering problem.