Utilization of energy storage system for frequency regulation in large-scale transmission system

Minhan Yoon, Jaehyeong Lee, Sungyoon Song, Yeontae Yoo, Gilsoo Jang, Seungmin Jung, Sungchul Hwang

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


As the penetration rate of renewable energy resources (RES) in the power system increases, uncertainty and variability in system operation increase. The application of energy storage systems (ESS) in the power system has been increased to compensate for the characteristics of renewable energy resources. Since ESS is a controllable and highly responsive power resource, primary frequency response and inertia response are possible in case of system contingency, so it can be utilized for frequency regulation (FR) purposes. In frequency regulation, reduction of the Rate of Change of Frequency (RoCoF) and increase the frequency nadir by improving the response characteristics are important factors to secure frequency stability. Therefore, it is important to control ESS with proper parameters according to changing system situation. In this paper, we propose a method to calculate and apply a frequency droop, which is basically required according to the power system condition based on swing equation and effective inertia assessment. In addition, a method to estimate RoCoF droop according to the correlation with frequency by estimating the systematic inertia in the current situation is proposed. The case study for verification of the proposed method was performed through dynamic simulation using actual Korean power system data. The results show that the proposed method is more effective than the governor-free of the conventional thermal generator and conventional droop control-based FR-ESS.

Original languageEnglish
Article number3898
Issue number20
Publication statusPublished - 2019 Oct 15


  • Adaptive droop
  • ESS
  • Effective inertia
  • Frequency regulation

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Control and Optimization
  • Electrical and Electronic Engineering


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