随州EMS系统中对零阻抗支路的改进处理方法

为有效利用母联开关上配备的有功和无功量测，电力系统中的母联开关被抽象成连接在两个母线节点间的零阻抗支路；另外，在有些三绕组变压器的等值模型中，由于中压侧阻抗很小带来计算过程中的数值不稳定性，也可使用零阻抗支路的改进处理方法。深入分析了与零支路相关的各类量测，采用了一种新思路来列写偏导方程，从而在状态估计和潮流计算的处理中根据零支路两侧的相关数据建立对应的雅克比矩阵行。实践证明，该方法提高了数值稳定性，计算结果也更合理。

An Improved Method of Analyzing Zero Impedence Branch in EMS

The bus coupling switch is usually modeled as a zero impedance branch.In some equivalent circuit of the three winding transformer,impedance of the middle winding is small(positive or negtive).To avoiding numeric instability,it can be modeled as a zero impedance branch. This paper presents a improved method to build derivative equations and make jacbian matrix using the zero impedance branch.Practice proves that the result is more stable and resonable.