Inaccuracies in Network Realization of Rational Models Due to Finite Precision of RLC Branches
Inaccuracies in Network Realization of Rational Models Due to Finite Precision of RLC Branches
复制标题
RLC分支精度有限导致有理模型网络实现不准确
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
A. Fernandes
中科院分区：
文献类型：
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作者：
A. Lima;B. Gustavsen;A. Fernandes
电力系统暂态仿真中最具挑战性的一点是对频率相关阻抗或导纳进行建模，并将其包含在仿真环境中。高精度模型可以通过频域中的有理函数近似来识别，例如通过矢量拟合。在时域仿真中包括所获得的模型的一种方式是经由等效电路。本文展示了一种情况下，通过在ATP的等效电路建模给出了一个不准确的合理的模型表示。结果表明，有限精度的分支卡导致灾难性的取消错误的RLCG分支的表示。对输出格式的敏感性进行了研究。
One of the most challenging points in the simulation of power system transients is the modeling of frequency dependent impedances or admittances and their inclusion in the simulation environment. Highly accurate models can be identified via rational function approximations in the frequency domain, for instance by Vector Fitting. One way of including the obtained model in a time domain simulation is via an equivalent electrical circuit. This paper shows a case where the modeling via an equivalent circuit in ATP gives an inaccurate representation of the rational model. It is shown that the finite precision of the branch cards causes a catastrophic cancellation error in the representation of an RLCG branch. The sensitivity to the output format is investigated.