适用于统一迭代潮流计算的扩展型“Sen”变压器模型

为了发展基于扩展型“Sen”变压器(Extended Sen Transformer, EST)的潮流计算理论与方法，从简化EST潮流模型的角度出发，提出了一种适用于统一迭代潮流计算的EST模型。首先，根据EST的工作原理，将串、并联侧绕组等效为电压源与阻抗串联组成的支路，进而把EST简化为一种双电压源型等效电路。然后，基于统一迭代法的解算思想，并结合EST的电压调节、相角调节和功率调节运行模式，建立了EST的稳态潮流模型。最后，借助Matlab软件，算例分析在一个修改的IEEE6机30节点系统中展开。通过比较所提模型与软件仿真所得系统节点电压幅值和相角，二者之间偏差在合理范围内，验证了所提模型的有效性。

Modelling of extended Sen transformer for a unified iterative power flow solution

In order to develop the theories and methods for load flow calculation of a power system with the Extended Sen Transformer (EST), an EST model suitable for a unified iterative power flow solution is proposed from the perspective of simplifying the power flow model of the EST. First, according to the working principle of the EST, the series and shunt windings of the EST are both equivalent to a series-connected branch composed of a voltage source and an impedance. As a result the EST becomes an equivalent circuit of a dual voltage source. Then, based on the solution idea of the unified iterative method, a steady-state power flow model of the EST is established considering the operation modes of the EST such as the voltage regulation, phase angle regulation and independent power flow regulation. Finally, MATLAB software is used to carry out a simulation for the modified IEEE 6-machine 30-bus system. The magnitude and phase angle of the node voltages obtained through the Matlab simulation and the proposed model can reach acceptable agreement, confirming the effectiveness of the proposed model. This work is supported by National Natural Science Foundation of China (No. 51567006), Program for Top Science and Technology Talents in Universities of Guizhou Province (No. 2018036) and Science and Technology Fund of Guizhou Province (No. 2019]1100).