Under large disturbances in power grids

virtual synchronous generators (VSG) face a high risk of transient instability. Among them

power angle stability and frequency stability are two key factors for ensuring safe and stable VSG operation. However

existing studies seldom consider these two aspects in an integrated manner. To address this gap

a VSG large signal equivalent model is first established

and the influence of VSG control parameters on transient power angle stability and frequency stability under different fault depths is analyzed

revealing the inherent conflict between the two stability objectives. Subsequently

an adaptive transient control strategy based on angular frequency negative feedback is proposed. By introducing virtual inertia

virtual damping

and virtual power reshaping

this method enhances both rotor angle stability and frequency stability. To further optimize the transient performance

a control parameter design method that accounts for frequency dynamic response is proposed

along with a quantitative characterization of the feasible domain of parameters. Finally

the effectiveness of the proposed method and parameter design is verified through Simulink and RT-Lab hardware-in-the-loop (HIL) platform