Abstract: Load shedding control is one of the key technologies in the stable operation and efficiency optimization control of power system. Aiming at the optimization problem of load over-cut rate in the optimal control of minute-level accurate load-cutting efficiency， in this paper， a precise control method for load cutting is presented， which takes into account the granularity of users response load. Firstly， the granularity of user response load is taken as the starting point， and the strategy of demand response is adopted to reduce the granularity of user response load. Secondly， the optimal model of the minimum load over-cut rate is constructed by load classification modeling. Finally， a numerical example is given to show that the proposed method can reduce the load over-cut effectively compared with the traditional minimum over-cut control method. The validity of the proposed method is verified by the reduced over-cut rate and its volatility.

Key words: precise load shedding control, user response load granularity, demand response, over-shear rate