In view of the challenge by the system peak-valley difference due to the large-scale wind power anti-peak-regulation characteristic and air-conditioning load to both the economy and security of power system operation， a new interactive mode of voluntarily declaring power consumption willingness and peak-load shifting cost is designed. The interactive mode is based on an analysis of load shifting potential of commercial and industrial customers. Based on this mode， a load model of interactive customer fully reflecting customer willingness on the customer side is developed. A generation and load integrated scheduling model is built by embedding the load model of interactive customer into the traditional security constrained unit combined model. The load model of interactive customer can participate in power network operation as scheduling resources， reducing the cost of expensive generator start and stop as well as the operation cost of the power system. New England 39-bus system validates the effectiveness of the proposed mode and model.