1.School of Electrical Engineering, Shenyang University of Technology, Shenyang 110870, China;2.School of Electrical Engineering, Northeast Electric Power University, Jilin 132012, China

Coordinated control of load-side flexible resources to accommodate wind power is one of the key technologies for constructing a new power system. Considering that the forecast accuracy of wind power increases with the shortening of the forecast time scale, this paper proposes a multi-time-scale optimal scheduling strategy for flexible loads such as seawater desalination and electric heating to accommodate the redundant wind power. First, the power and electricity balance relationship of the coordinated accommodation of wind power by the multi-variable system is analyzed. A model of operating characteristics of adjustable support capacity of seawater desalination and electric heating loads is established. Then, considering the scheduling advantages and operation boundaries of load, the adaptability of scheduling demand of wind power accommodation at different time scales is analyzed and a multi-time-scale optimal scheduling mechanism is established. On this basis, the day-ahead, intra-day and real-time optimal scheduling models are established. A multi-time-scale optimal scheduling method is proposed for the coordinated accommodation of wind power in a multi-media and multi-energy flow system containing electricity-water-heat-storage. Finally, the numerical analysis is carried out by taking the winter heating period of a coastal city in northern China as an example. The results show that this method has a strong ability to follow the fluctuation of wind power in both positive and negative peak-shaving output of wind power. It can effectively improve the wind power utilization rate and operation economy.