高风电渗透率下考虑二次频率跌落的电力系统调度策略

Wind power generation (WPG) has become one of the prominent forms of new energy generation. However, the large-scale integration of WPG into the grid poses a significant challenge to the frequency stability of the power system, especially with respect to the secondary frequency drop (SFD) that may occur due to WPG’s participation in frequency regulation. This paper proposes a new power system dispatch strategy considering SFD. Firstly, the frequency response model of power system is constructed in different stages of frequency drop, and the ladder reserve method is used to reduce the order of the model to get the key frequency indices. Secondly, a day-ahead and intra-day integrated dispatch model of power system is established through considering dynamic frequency constraints. Finally, considering the nonlinearity in the frequency constraints, the dispatch model is solved by mixed integer model programming and the two-stage iterative methods. The results show that, compared with existing SFD-focused models, the proposed dispatch method reduces the maximum deviations of PFD, SFD, and steady-state frequency by approximately 2–10% and lowers WPG curtailment by about 4–5% across both benchmark and real grid systems.