基于CIM的电力变压器模型分析

变压器模型正确与否对电力系统分析结果影响很大。离线潮流计算中,变压器等值阻抗是直接给定的,因而使用变压器模型通常无需考虑变压器分接头对等值阻抗的影响。而在调度自动化系统中,变压器的等值阻抗一般由主接头下短路试验数据计算而来,但变压器实际上可能在不同的分接头下运行,需要考虑变压器分接头调整的影响,且其影响比较显著。详细分析表明基于公共信息模型(CIM)定义的变压器模型可以非常方便地计及分接头调整对变压器等值阻抗的影响,非常适合于调度自动化系统,并且其参数计算非常方便。采用基于CIM的变压器模型,不仅可以方便地实现系统的互联,也可以保证电力系统计算的正确性。

Transformer Representation Based on Common Information Model

An accurate model for a transformer is of fundamental importance to the results of power system analysis. In off-line power flow studies, as the equivalent impedance of a transformer is directly given, it is not necessary to consider the effect of tap changer regulation on the impedance of a transformer when a transformer model is selected. But in the dispatching automation system, the equivalent impedance of a transformer is calculated by short circuit test data in the under main tap position. In fact, the transformer can operate in any tap position, thus the effect of tap changer regulation on the equivalent impedance of a transformer must be considered, and the effect is very significant. Detailed analysis indicates that the transformer model based on the common information model (CIM) can easily consider the effect of tap changer regulation on the impedance of a transformer. It is a very satisfactory model for dispatching automation system, and the calculation of its parameters is very simple. Using transformer model based on CIM can not only accomplish system interconnection, but also guarantee the correctness of power system calculation.