Abstract: Recently, doubly-fed induction generator-based wind turbines (DFIG-WTs) have been widely involved in the system frequency regulation process by adopting reasonable control strategies. Thus, wind power, as an ever-increasingly important energy source, is expected to play a significant role in both power generation and frequency regulation in modern power systems. Considering the variability of wind resources, wind power generation has inherent uncertainties, and the integration of large-scale wind power into the grid will impact the reliability and frequency security of the power system. This paper investigates the integrated assessment of reliability and frequency of power systems with a high penetration level of wind power. Firstly, the system frequency regulation process considering the virtual inertia response of DFIG-WTs is modeled. The analytical expression of system frequency deviation under supply and demand fluctuations and equipment failures is solved. Secondly, a frequency-sensitive reliability model of the generators is established to analyze the coupling relationship between system reliability and frequency deviation. Finally, a multi-time scale analytical framework is proposed to calculate the integrated reliability and frequency indices. The simulation results show that it is necessary to consider the influence of the frequency adjustment process and frequency deviation on the generators' reliability parameters when evaluating the reliability of a high-proportion wind power system.