STABILITY SOLUTION FOR THE 220 KV POWER GRID INTEGRATED WITH RENEWABLE ENERGY SOURCE USING BESS: A CASE STUDY OF VIETNAM

le van dai

doi:10.30572/2018/KJE/170233

Authors

le van dai Faculty of Electrical Engineering Technology, Industrial University of Ho Chi Minh City, Ho Chi Minh City, Vietnam

DOI:

https://doi.org/10.30572/2018/KJE/170233

Keywords:

Battery energy storage systems (BESS), transmission corridor analysis, frequency response, renewable power variability, power system operation

Abstract

This paper proposes a control method for battery energy storage systems (BESS) connected to a 220 kV transmission network to enhance grid stability when renewable energy sources (RES), such as wind and solar, are integrated. This problem leads to significant issues developing for grid stability, including frequency instability, transmission line overloads, and grid failures. The research mainly focuses on the 220 kV transmission line between the 500 kV Pleiku and Dak Nong substations in Vietnam's Tay Nguyen area. Using PSS®E and DigSILENT Power Factory modeling tools, the findings reveal that combining three BESS units, each with a rated power capacity of 200 MW and an energy storage capacity of 673 MWh, effectively reduces grid congestion and stabilizes frequency fluctuations. Simulation findings estimate a decrease of 2,057 MWh in surplus power production. in case with the BESS connection, the minimum system frequency during rapid RES production increases to 49.17 Hz, up from 48.91 Hz without BESS, ensuring that power flows remain within acceptable operating limits. These simulation results illustrate the proposed method BESS, can enhance grid performance, decrease faults, preserve frequency stability during RES fluctuation, and facilitate Vietnam's clean energy transition, notably in the Tay Nguyen area. This proposed method also meets the frequency stability standards outlined in Circular No. 25/2016/TT-BCT issued by the Vietnamese Ministry of Industry and Trade

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