Dual-stage operation strategy of BESS for frequency regulation considering planned peak shaving

With the increasing penetration of the renewables, power system is with the challenge of the frequency stability. Battery energy storage systems (BESS) is regarded as an effective way providing frequency regulation services (FRS). However, the high-quality frequency regulation sources fail to be fully utilized, because the current ancillary services market rules cannot quantify the contribution of BESS in FRS in current ancillary services market rules. Therefore, it is significant that the existing BESS, which have already provided the peak shaving service (PSS), are further involved in the FRS. In this paper, a dual-stage operation strategy (DOS) for BESS based on dynamic programming method (DPM) is proposed. In detail, DPM is applied in Stage I planning BESS in PSS, and DPM is applied again in Stage II arranging BESS in FRS. At last, the promising results show the application of DOS takes full advantage of BESS in FRS irrelevant to ancillary services market rules. Meanwhile, the original arrangement of BESS in PSS and the corresponding profit are both satisfied.