Mitigating Transmission Line Impacts Due to DERs by Ancillary Services Provided by Battery Energy Storage System in a Multi-Area Network

In a multi-area network Distributed Energy Resources(DERs) of one area can significantly impact the transmission line flows of other area. The change in transmission line flows over a longer period will lead to transmission revenue loss for a transmission owner. In this study the feasibility of battery energy storage system providing ancillary service to mitigate the line flow impacts of the non-DER area due to the DERs in a neighboring area is studied. Firstly, the line flow difference of the lines in a non-DER area for the DER and non-DER scenario is captured. The most significant lines of the non-DER area are identified based on the number of hours a line experiences a line flow difference exceeding a predefined threshold. Optimization is conducted to determine the additional battery capacity needed at each DER bus to limit the line flows of the identified significant lines. The results demonstrate that utilizing battery energy storage as ancillary services is an effective strategy for mitigating line flow impacts which in turn reduces the revenue loss for the transmission owner.