Integration of wind power affects system frequency stability because of its rapid volatility and frequency decoupling characteristics, wind power will be incorporated in day ahead and intro-day scheduling selectively under different wind power penetrations, how to determine effects on frequency control of wind power integration is a problem. This paper establishes a long- term dispatching decision simulation platform based on power system simulation software DIgSILENT/PowerFactory. The platform is a two-layer control structure containing scheduling side and power station side, it could do simulation of long-term frequency response process after wind integration. At last, taking an actual power grid as an example, impact of wind power integration on frequency control is simulated, thus, wind power dispatching and operation scheme is determined, and the validity of model is checked.