Bidding Strategy of Battery Energy Storage Power Station Participating in Frequency Regulation Market

As an important part of high-proportion renewable energy power system, battery energy storage station (BESS) has gradually participated in the frequency regulation market with its excellent frequency regulation performance. However, the participation of BESS in the electricity market is constrained by its own state of charge (SOC). Due to the inability to accurately predict the next day's real-time SOC, the mismatch between bidding strategy and real-time scheduling is easy to occur. Aiming at the multi time scale clearing mechanism in the frequency regulation market, this paper divides the bidding strategy of the BESS participating in the frequency regulation market into two stages: the day ahead market (DAM) and the real time market (RTM). In the pre-clearing stage of the DAM, since it is impossible to accurately predict the frequency regulation command of the next day, the cost of dynamic frequency regulation of BESS is reasonably simplified to avoid the loss of BESS to the maximum extent. In the real-time clearing stage of the RTM, the capacity constraint factor is introduced according to the real-time SOC of BESS, and the initial quotation before the day is adjusted, so that the time-varying characteristic of the SOC of BESS is considered in the bidding strategy.