With the continuous expansion of renewable energy's integration to power grid

conventional thermal power units are gradually replaced by renewable energy power units

resulting in poor frequency characteristics of power system against load disturbance under the condition of high-penetration new energy. Focusing on the frequency stability of power system peak-shaving operation under large-scale wind power grid connection

this paper draws a conclusion that the frequency regulation ability of the system is weak during start-stop peak shaving and deep peak shaving. To solve this problem

firstly

the conventional AGC system frequency model is improved

and the frequency response model considering renewable energy permeability

governor deadband and generation rate constraints is proposed. Then

based on the frequency response model

the frequency regulation performance of the system during peak-shaving at different wind power permeabilities is studied. Finally

based on two typical peak-shaving modes of thermal power units

the simulation is carried out within the two-area power system considering the fluctuation of wind power. The simulation results show that

the ability of power system to resist load disturbance in deep peak-shaving is stronger than that in start-stop peak-shaving. On this basis

combined with the improved fan integrated inertia control strategy

the frequency regulation performance of power grid peakshaving operation is effectively improved

and the problem of frequency stability of power system peak-shaving operation is solved.