Enhancing grid flexibility with coordinated battery storage and smart transmission technologies

The integration of large-scale renewable energy sources (RES), rising population, and escalating electricity demands challenge conventional power grids capacity to satisfy the escalating energy requirements due to an increase in the congestion level of the network. RES's inherent intermittency further complicates its integration into the power grid. One viable strategy to tackle these challenges involves the utilization of battery energy storage systems (BESS), which helps to store surplus energy, and discharge the stored energy when wind generation falls short of demand. However, increased flexibility is needed to meet escalating demands. Dynamic line rating (DLR) and optimal transmission switching (OTS) are efficient solutions that can alleviate network congestion and reduce operational costs. This paper presents a BESS model coordinated with DLR and OTS to efficiently utilize existing network infrastructure by integrating more RES into the grid. Firstly, the BESS model determines the optimal charging and discharging of the storage units. Secondly, DLR is incorporated into the model, employing a novel method to determine the optimal placement of DLR on overhead lines. Furthermore, OTS is co-optimized with DLR and BESS, facilitating network reconfiguration to enhance system flexibility and cost-effectiveness. The findings highlight the efficacy of this tripartite integration in terms of reduction in total cost, load and wind curtailment and surpassing the outcomes achieved by individual or paired technologies.