Comparative Study of Voltage and Control Characteristics of Two-Core and Single-Core Step-Up/Down Thyristor-Controlled Phase-Shifting Transformers

Ningyu Zhang (), Huarui Li, Xiaokuan Jin, Chongze Bi and Jianhua Wang
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Ningyu Zhang: State Grid Jiangsu Electric Power Co., Ltd., Research Institute, Nanjing 211103, China
Huarui Li: State Grid Jiangsu Electric Power Co., Ltd., Research Institute, Nanjing 211103, China
Xiaokuan Jin: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Chongze Bi: School of Electrical Engineering, Southeast University, Nanjing 210096, China
Jianhua Wang: School of Electrical Engineering, Southeast University, Nanjing 210096, China

Energies, 2025, vol. 18, issue 4, 1-13

Abstract: The thyristor-controlled phase-shift transformer (TCPST) is an effective means of controlling power flow, exhibiting a simple structure and a long operating life. However, conventional TCPSTs are limited in their ability to regulate the phase-shifting angle, necessitating the matching of the step-up/down transformer to control the amplitude of voltages. Therefore, this paper puts forth two distinct structures of TCPSTs, each of which is capable of regulating both the phase-shifting angle and the amplitude of voltages: the two-core step-up/down thyristor-controlled phase-shifting transformer (TCSUD-TCPST) and the single-core step-up/down thyristor-controlled phase-shifting transformer (SCSUD-TCPST). Moreover, a comparison was conducted between the topology structure and the thyristor-controlled strategies of the TCSUD-TCPST and the SCSUD-TCPST. The coupling relationship and the limitations of the phase-shifting angle and the amplitude of voltages are illustrated, indicating that the SCSUD-TCPST appears to be a more suitable option for power transmission. Furthermore, the considerable static and dynamic characteristics of the TCSUD-TCPST and the SCSUD-TCPST were investigated through the PLECS simulation platform, which was also employed to further verify the aforementioned conclusions.

Keywords: thyristor-controlled phase-shifting transformer; step-up/down transformer; power flow; flexible alternative current transmission systems; topology structure (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: 2025
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