Research on the Participation of Battery Energy Storage in the Primary Frequency Control Method of Conventional Coal-Fired Power Plants

With the release and implementation of the “double carbon” policy, a large number of new energy sources with fluctuating and intermittent characteristics are integrated into the power grid, and the stability of the power system is challenged. Therefore, how to ensure the safe and stable operation of the power system is now a key issue to be solved. The traditional means of frequency regulation relies on thermal power units, but it has low efficiency of frequency regulation, which is harder to adapt to the new track of the current rapid development of the power grid. Compared with thermal power units alone, battery energy storage systems assist thermal power units to participate in frequency regulation can solve most of the problems of thermal power units alone. In this paper, we construct a power system model from the principle of grid frequency regulation, and verify the reasonableness and necessity of battery storage system participation in frequency regulation with thermal units alone and battery storage system-assisted thermal units respectively. The frequency regulation effect of the traditional thermal unit frequency regulation and the joint thermal storage model are compared, and the variable coefficient sag control is simulated in the joint thermal storage model, and the fuzzy PID algorithm and the artificial neural network (ANN) algorithm are added to the joint thermal storage model, which has obvious superiority compared with the traditional thermal unit frequency regulation. Among them, the fuzzy PID algorithm is the most effective, which can produce a small change in the frequency scale value, followed by the ANN algorithm and the combined fire storage frequency model.