Abstract: With the high-proportion integration of renewable energy such as wind power and photovoltaic power into the power system, the equivalent inertia and damping level of the system continue to decrease, and the frequency response capability is significantly weakened. Therefore, starting from the frequency response mechanism of low-inertia power systems, this paper constructs a frequency dynamic model including virtual inertia and damping, analyzes the influence law of key parameters on frequency characteristics, and proposes an inertia/damping adaptive coordinated regulation strategy based on state partitioning. It dynamically adjusts inertia and damping parameters according to the frequency change rate and deviation amplitude to realize the switching of regulation focus in different response stages. Simulation verification through the PSCAD microgrid model shows that the proposed method can effectively reduce RoCoF, raise the frequency extreme value, and improve the system frequency stability under the condition of high renewable energy penetration.