Abstract A steady-state model of Extended Sen Transformer (EST) for unified iterative power flow solution is proposed in order to develop the models and methods of power system steady analysis involving the EST. According to the working principle of the EST, both the series and shunt windings of the EST can be represented by a branch of a voltage source and an impedance connected in series, which subsequently means that the EST may be expressed as an equivalent circuit with dual voltage sources. Furthermore, with the help of the unified iterative power flow solving methodology, a steady-state model of the EST is able to be established considering its three main operational modes such as voltage regulation, phase angle regulation and independent power flow regulation. The load flow tool in MATLAB is employed to carry out the simulative analyses for a modified IEEE 6-machine and 30-bus system and a modified IEEE 54-machine and 118-bus system with ESTs. The magnitudes and phase angles of the bus voltages resulted from the MATLAB simulation and the analytic calculation utilizing the proposed model can reach acceptable agreement, confirming its effectiveness.

中文翻译：

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用于统一迭代潮流解决方案的扩展 Sen 变压器的稳态建模

摘要 为了发展涉及EST的电力系统稳态分析模型和方法，提出了统一迭代潮流求解的扩展Sen变压器(EST)稳态模型。根据EST的工作原理，EST的串联绕组和并联绕组都可以用一个电压源的支路和一个阻抗串联来表示，这也就意味着EST可以表示为一个双路等效电路。电压源。此外，借助统一迭代潮流求解方法，可以建立考虑其三种主要运行模式（电压调节、相角调节和独立潮流调节）的EST稳态模型。利用MATLAB中的潮流工具对改进的IEEE 6机30总线系统和改进的IEEE 54机118总线系统与ESTs进行了仿真分析。MATLAB 仿真和分析计算得出的母线电压幅值和相角可以达到可接受的一致性，证实了其有效性。