Based on the security constrained economical dispatch model，a generation scheduling model for the wind-thermal power system is presented by introducing the wind curtailment penalty factor.The model integrates the wind power preferentially，but allows shedding the wind power in certain circumstances to ensure the security of the grid.A case study of a provincial power system in China is used to test the model.The results show that it is able to coordinate optimizing the wind power generation and the thermal units output and give priority to wind power.When the grid is not able to accommodate all the wind power，it should be shed in order on all wind farms in accordance with the prior formulated wind curtailing principles to meet the grid’s security constraints while ensuring that the security cross-section will be within limits.