The load distribution of each power plant in the power system is the process of power balance. Electricity balance is one of the important calculations in the power grid design and transmission process. Its purpose is to determine how the power and intensity of each power station in the power system can meet the needs of the entire load system. The purpose of this paper is to consult a new power system power cell balance method based on considering multiple types of flexible sources and loads. Aiming at the problem that the traditional power balance method cannot calculate the output process of a single thermal power station, using the principle of the improved successive load shedding method, through the nested structure, a new thermal power station power balance calculation method is proposed. Consulting platform for new power system power balance method. The case study shows that the power system based on the algorithm proposed in this paper is larger than the improved sequential load shedding method. This method avoids the ambiguity of the traditional power balance method in dealing with the typical daily output process and the maximum shaving capacity of each thermal power plant, and has certain advantages in solving the thermal power output process.