Renewable energy penetration has been consistently Increasing in power systems across the world. Renewable energy systems are integrated into the power grid by essentially a power electronics converter system, these power electronic converters act as an inertialess interface. Now, large power injection to the grid from an inertialess system leads to an effective reduction in the overall system inertia thus affecting overall system damping. In this paper, the impact of integrating renewable energy on damping of the system is first examined by eigenvalue analysis, then a supplementary adaptive wide-area damping controller is implemented to improve the system damping of low-frequency oscillation. Two different approaches for implementation of damping controller has been carried out. In the first approach, the damping controller is implemented by giving control action to the excitation system of synchronous generator and in seconds approach the control action is provided through the power electronics converter using power modulation technique. It is observed from the simulation results that the power system damping is better improved by control action through converters than the excitation control.