A short‐circuit analysis algorithm capable of analyzing unbalanced loads and phase shifts through transformers using the Newton‐Raphson power‐flow calculation, sequence, and superposition methods,International Transactions on Electrical Energy Systems

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A short‐circuit analysis algorithm capable of analyzing unbalanced loads and phase shifts through transformers using the Newton‐Raphson power‐flow calculation, sequence, and superposition methods
International Transactions on Electrical Energy Systems ( IF 1.9 ) Pub Date : 2020-10-13 , DOI: 10.1002/2050-7038.12653
Insu Kim ₁

Affiliation

Load in short‐circuit analyses is usually neglected because the short‐circuit current magnitude that flows from conventional rotating machines is significantly greater than the short‐circuit current magnitude changed by the loads. However, as distributed loads unbalanced in phases have been connected to a grid, the current that flows from them affects the magnitude and angle of the short‐circuit current. Thus, the objective of this study is to develop a short‐circuit algorithm able to analyze the effect of unbalanced loads and phase shifts through transformers on the short‐circuit current. For this purpose, this study adds the steady‐state short‐circuit models of loads unbalanced in phases to the sequence network. To determine the accurate short‐circuit current, this study proposes the superposition principle that superimposes the contribution of pre‐ and post‐fault conditions. To calculate the pre‐ and post‐fault voltages, this study also combines the three‐phase Newton‐Raphson and sequence methods. In addition to the superposition principle, this study takes phase shifts through three‐phase transformers in the sequence network into account. The case studies indicate that the proposed method could be more accurate because of not ignoring loads unbalanced in phases and the phase shift through transformers.

中文翻译：

一种短路分析算法，能够使用牛顿-拉夫森潮流计算，顺序和叠加方法来分析变压器的不平衡负载和相移

短路分析中的负载通常被忽略，因为从常规旋转电机流出的短路电流幅度明显大于负载所改变的短路电流幅度。但是，由于已将不平衡的分散负载连接到电网，流过它们的电流会影响短路电流的大小和角度。因此，本研究的目的是开发一种短路算法，能够分析不平衡负载和通过变压器的相移对短路电流的影响。为此，本研究在相序网络中增加了相位不平衡的负载的稳态短路模型。为了确定准确的短路电流，本研究提出了叠加原理，该原理叠加了故障前后条件的影响。为了计算故障前后的电压，本研究还结合了三相牛顿-拉夫逊法和顺序法。除叠加原理外，本研究还考虑了顺序网络中通过三相变压器的相移。案例研究表明，由于不忽略相中不平衡的负载以及通过变压器的相移，所提出的方法可能更准确。

更新日期：2020-10-13

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