Abstract: Large-scale grid-connection photovoltaic power（PV）generation causes power system to face the problem of insufficient equivalent moment of inertia and insufficient primary frequency regulation capability. One of the important means to solve this problem is to take part in grid frequency regulation actively. This paper analyzes the frequency response characteristics of traditional power system firstly. Then a dynamic frequency response model of power system including PV generation is established. The rate of change of frequency（RoCoF）,the frequency nadir from peak,the frequency overshoot and stability time are taken as the characteristic quantity to evaluate the dynamic process of frequency regulation. The impact and variation of novel frequency regulation control strategies and parameters on dynamic process of system frequency are qualitatively analyzed. Finally,a two-area four-machine simulation model is built in PSCAD/EMTDC simulation platform. The validity of the mechanism analysis and the feasibility of the novel frequency control strategy is verified by time-domain simulation.