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首页> 外文期刊>Electric power systems research >Frequency scan on a phase-coordinates frame for unbalanced systems
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Frequency scan on a phase-coordinates frame for unbalanced systems

机译：不平衡系统在相位坐标系上进行频率扫描

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The unbalanced electric networks analysis has upgraded from the sequence components frame models to the phase-coordinates frame models. The electric power distribution systems for industrial plants, commercial buildings or residential costumers can contain several network unbalances that can be easily represented by phase-coordinates models. The phase-coordinates models can be used for the analysis of distribution systems at fundamental frequency as well as for other frequencies and are well suited for the harmonic analysis of unbalanced networks. The formulation of the frequency scan method in a phase-coordinates frame, besides allowing for a more accurate modeling of unbalanced networks, allows the specification of harmonic injections of any type: single-phase or three-phase of the desired sequence. Therefore, it is possible to study the effect of the non-linear loads according to its features and connection to the circuit. This paper develops the phase-coordinates model of an unbalanced distribution power system, considering the representation of three-phase transformer banks of three or two single-phase transformers, as well as other asymmetries that can be found in the electrical systems of industrial plants, commercial or service facilities. The present model improves the representation of the single-phase transformer with mid-tap on the secondary side. The frequency scan based on the present model is tested with a simple example of a four-wire delta system that highlights the possibilities of the model in phase-coordinates.
机译：不平衡电网分析已从序列分量框架模型升级为相坐标框架模型。用于工厂，商业建筑或住宅用户的配电系统可以包含多个网络不平衡，可以通过相坐标模型轻松表示。相位坐标模型可用于基本频率以及其他频率的配电系统分析，非常适合于不平衡网络的谐波分析。在相位坐标系中制定频率扫描方法，除了可以更精确地对不平衡网络建模外，还可以指定任意类型的谐波注入：所需序列的单相或三相。因此，可以根据非线性负载的特性和与电路的连接来研究非线性负载的影响。本文考虑了由三台或两台单相变压器组成的三相变压器组的表示形式，以及在工厂设备的电气系统中发现的其他不对称性，开发了一种不平衡配电系统的相坐标模型，商业或服务设施。本模型改进了次级侧中间抽头的单相变压器的表示。基于四线三角系统的简单示例测试了基于当前模型的频率扫描，该示例突出了模型在相位坐标中的可能性。

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