<p>In this study, we introduce a new control strategy for a virtual synchronous generator using a simpler third-order model, referred as simplified model reduces complexity while maintaining essential behavior. By including active power as a new factor, we can now use more advanced controllers that greatly improve the stability during sudden changes in small-scale power systems. This is particularly helpful during major disturbances, power fluctuations, and when switching between standalone and grid-connected modes. To account for the varying control requirements of the virtual synchronous generator, we employ an adaptive tuning method to ensure optimal responses to grid modifications. We also introduce online estimators for virtual mechanical power and a specific time constant, allowing for real-time adjustments. One significant benefit of our new controller is its ability to boost stability during transitions and to facilitate the integration of solar panels with battery storage systems into small power networks. The simulation results demonstrate the robustness and performance of the proposed controller, showing favorable comparisons to both supplementary and classical controllers operating under similar scenarios. This highlights its reliability and efficiency.</p>