Research on Topology and Regulation Characteristics of Single-Core Independent Phase Shifting Transformers

Power systems worldwide are evolving toward interconnection and long-distance transmission, resulting in issues of uneven power flow distribution. Single-core independent phase shifting transformers (SCIPSTs) can regulate voltage magnitude and phase angle, serving as an effective solution to this problem. To provide guidance on the parameter design for practical applications, this paper conducted a study on the topological structure, regulation characteristics, and parameter design of SCIPSTs. First, the topological composition and working principle of SCIPSTs are elaborated. Regulation of voltage magnitude and phase shift angle is achieved by controlling the magnitude and phase of the compensation voltage. Second, the voltage regulation characteristics of SCIPSTs are analyzed, and the constraint mechanisms of the source-side winding transformation ratio and load-side winding transformation ratio on the compensation voltage range are revealed. Third, the influence of symmetric and asymmetric parameter designs on the regulation range is discussed, illustrating the key parameter design methods. Finally, a system simulation model is built to verify the voltage regulation and power flow control effects of SCIPSTs. Simulation results show that SCIPSTs can realize independent regulation of active power and reactive power within a certain range, with significantly improved regulation precision and performance.