Day-ahead Scheduling for Improving the Transfer Capability Utilization Rate of Transmission Interface with Battery Energy Storage

Investigating the transfer capability utilization rate of transmission interface flow is one of the important steps for formulating the day-ahead renewable power generation schedule. However, restrained by transmission limitations and curtailments, the dispatch-down of renewable energy has already become a prominent problem that declines the utilization rate of transmission interfaces. In this paper, a day-ahead scheduling model considering the flexibility of battery energy storage (BES) is proposed. Transmission interface constraints are introduced to limit the magnitude and direction of the power flow across the specific interface. By optimizing the proposed model, the charging and discharging schedule of BES units is obtained to regulate the output of wind and thermal units and fully utilize the transfer capability of the interface. Moreover, compared with different scenarios of load fluctuation, the positive effect of BES on a flexible day-ahead scheduling is analyzed. Comprehensive case studies on the modified IEEE 30-bus system validate that the BES is effective to improve the utilization rate of transmission interfaces without wind curtailments.