Abstract: Virtual synchronous generator control, as a representative grid construction technology, not only delivers inertia and damping support to power systems but also introduces power oscillation challenges. In distributed and differentiated cluster parallel systems, active power oscillation mechanisms become particularly complex. Addressing oscillation issues caused by damping variations among clustered grid-connected units, this paper thoroughly examines how parallel unit damping differences affect system stability and elucidates their stabilization effects on grid-tied systems. Building on this analysis, we propose a comprehensive transient and steady-state damping difference compensation strategy that simultaneously suppresses transient damping variations and corrects steady-state output errors while enhancing system transient response characteristics. The study establishes a state-space small-signal model incorporating the proposed control strategy to investigate how transient power compensation and steady-state power correction components influence parallel system stability. Using root locus analysis, we develop corresponding parameter adjustment methods and selection criteria. Simulation results ultimately validate the strategy's effectiveness in mitigating power oscillations induced by clustered unit damping differences.