New energy including wind and photovoltaics develops rapidly in recent years, while the corresponding normal energy, such as water, thermal power and so on, is slowing down. Simultaneously, the ratio of normal energy goes down in the structure of grid network connected power with each passing year. This paper researches the effect of the large-scale new energy access to power grid on system peak regulation, which is based on the probability of wind power peak shaving, the real-time contribution made by wind power to the burden of grid, and photovoltaic output characteristics. In addition, the relationship between the available power-on mode of conventional power source and the systematic peak regulation is also studied. Consequently, the ability of peak regulation and the scale to taking in wind sources are obtained.