Implementation of the State-Space Power Transformer Model in ATP for High Frequency Transient Studies

State-space representation is a practical, efficient and reliable way to evaluate the high-frequency interaction of a transformer with the power network under different types of disturbances. Currently, this representation is available in commercial electromagnetic transient programs; however, this important tool is not yet implemented in the alternative transient program ATP. This paper describes the implementation methodology of the state-space model of the power transformer in ATP using the Norton type-94 component and foreign models. The proposed implementation incorporates several aspects relevant to its application in realistic situations, including initialization from steady state, customization of information exchange between the manufacturer and the purchaser, and accurate consideration of damping. The implemented model in ATP is validated on a real 50 MVA power transformer by means of three relevant example cases, obtaining an excellent agreement between the reference data and those calculated with ATP.

状态空间表示法（State-space representation）是评估变压器与电网在各类扰动下高频交互的一种实用、高效且可靠的方法。目前，该表示法已在商用电磁暂态程序中得到应用；然而，这一重要工具尚未在替代暂态程序ATP中实现。本文阐述了利用诺顿94型组件及外部模型在ATP中实现电力变压器状态空间模型的方法。所提出的实现方案涵盖了实际应用中的多个关键方面，包括稳态初始化、制造商与采购方之间信息交换的定制化，以及阻尼的精确考量。通过三个相关案例，在一台实际的50 MVA电力变压器上对ATP中实现的模型进行了验证，结果显示参考数据与ATP计算数据之间具有极好的一致性。