Analysis of Underground Distribution System Models for Secondary Substations

Boohyun Shin, Hyeseon Lee and Sungyun Choi ()
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Boohyun Shin: School of Electrical Engineering, Korea University, Seoul 02841, Republic of Korea
Hyeseon Lee: Distribution Power Laboratory, KEPCO Research Institute, Daejeon 34056, Republic of Korea
Sungyun Choi: School of Electrical Engineering, Korea University, Seoul 02841, Republic of Korea

Energies, 2024, vol. 17, issue 17, 1-22

Abstract: In Korea, the demand for complete underground installation of power distribution equipment installed on roads and green areas is increasing. In addition, KEPCO is making efforts to build a more reliable system for the underground distribution system. To meet these needs, this paper proposes the S-substation. In the S-substation, an RMU, a large power transformer, and an LV-Board (including ATCB and MCCB) are installed within the underground structure. This paper proposes three models to apply the S-substation to the underground distribution system. Power flow analysis is conducted for each model by simulating a variety of loads and DERs, and the frequency fluctuations are also examined under different distribution system events. An economic analysis is also conducted to select the optimal model. The economic analysis focuses on VOLL and construction costs. Based on power flow and economic analysis, one model is selected, and the underground distribution system that the model is applied is presented.

Keywords: secondary substation; power flow; underground distribution system; underground compact station; ring main unit; power quality; MCCB; MATLAB/SIMULINK; value of lost load (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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