Improvement of Voltage Profile in Distribution Line Using “Sen†Transformer

Unchol Jin, Unhyok Ri, Jonggang Ri and Munchol Pang
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Unchol Jin: Faculty of Electrical Engineering, Kim Chaek University of Technology, Pyongyang, Democratic People’s Republic of Korea
Unhyok Ri: Faculty of Electrical Engineering, Kim Chaek University of Technology, Pyongyang, Democratic People’s Republic of Korea
Jonggang Ri: Faculty of Electrical Engineering, Kim Chaek University of Technology, Pyongyang, Democratic People’s Republic of Korea
Munchol Pang: Faculty of Electrical Engineering, Kim Chaek University of Technology, Pyongyang, Democratic People’s Republic of Korea

International Journal of Research and Innovation in Social Science, 2025, vol. 9, issue 9, 7245-7257

Abstract: This study presents the problem of improving the voltage quality in distribution lines using “Sen†transformer (ST). The ST is made out of a transformer and tap changers and is capable of regulating the active and the reactive power flow selectively in the electric transmission and distribution line. A power system is having a need to provide good quality of supply which means the voltage should be maintained at some reasonable limits. All the electric devices are designed only to operate for a fixed value of its terminal voltage. The resent electrical power system is more complicated, so, there are many disturbances that occur in the system like voltage sag and swell, fault, unbalance loading, uncontrolled power flow, etc. Voltage sags and swells in the medium and low voltage distribution grid are considered to be the most frequent type of power quality problems based on recent power quality studies. In this paper, the ST has been used to improve quality of voltage in the distribution line with different phase angle of injecting voltage. Usage of ST has improved the voltage profile of the system. In this paper, the ST is simulated in MATLAB/SIMULINK for compensating voltage in distribution line during fault condition for maintaining constant voltage profile of the network. Through the simulation, it was confirmed that the voltage sags and swells in the distribution line are effectively suppressed by ST. The ST is easy to operate for improving voltage profile than other devices like DVR, D-STATCOM etc. The cost is also reduced and the operating reliability is increased compared to other types of devices using power electronic components.

Date: 2025
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