Development of the Control System for Fast-Responding Frequency Regulation in Power Systems using Large-Scale Energy Storage Systems

Abstract Energy storage systems (ESS) can be used to provide frequency regulation services in a power system to replace traditional frequency regulation power plants. Battery ESS, in particular, can provide “fast-responding frequency regulation,” wherein the facility can respond immediately and accurately to the frequency regulation signal sent by the system operator. This paper presents the development and the trial run results of a frequency regulation co ntrol system that uses large-scale ESS for use in a large pow er system. The control system was developed initially for the 4 MW ESS dem onstration facility in Jocheon Jeju Island, and was further deve loped for use in the 28 MW ESS facility at the Seo-Anseong substation an d the 24 MW ESS facility at the Shin-Yongin substation to pro vide frequency regulation services within mainland Korea. The ESS facility in Seo-Anseong substation responds to a sudden drop in frequency via governor-free control, while the ESS facility in Shin-Yongin responds via automatic generator control (AGC).