Development of frequency control performance evaluation criteria of BESS for ancillary service: A case study of frequency regulation by KEPCO

Abstract

In order to evaluate system frequency regulation ability of BESS, we propose a system equivalent model that can reconstruct the system environment using frequency characteristics. This equivalent model is designed to reflect the relationship between the characteristics of various generator units and the system frequency, and each parameter is parameterized by the actual frequency and the demand power. For the validity of the model, the output power of model and the output power of optimal power flow was compared and verified. In the case study, we verified that we were able to evaluate contribution of Frequency Regulation BESS using the model in actual grid and mentioned various applications.