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首页> 外文期刊>Power Delivery, IEEE Transactions on >Closed-Form Determination of the Impedance Locus Plot of Fault Current Limiters: A Rigorous Approach With Graphical Representation
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Closed-Form Determination of the Impedance Locus Plot of Fault Current Limiters: A Rigorous Approach With Graphical Representation

机译：故障限流器阻抗轨迹图的闭式确定：图形表示的严格方法

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摘要

In this paper, a mathematically rigorous method is presented to calculate the impedance of FCLs based on a desirable change of short circuit currents. The method is found on the principle of superposition and can be easily incorporated into standard short circuit current calculations of power systems. The changes of the short circuit currents for each FCL installed are easily calculated without having to build a new impedance matrix for each new case. In addition, the method gives a clear graphical representation of the impact of the FCL on the power system taking advantage of the FCL impedance locus in the complex plane. The resultant plots provide valuable insight and information to utilities, system planners, and FCL manufacturers. FCL manufacturers can use these plots to identify the FCL impedance value and angle subject to the manufacturing and system constraints. The plots also allow utilities and system planners to compute the changes of fault current distribution caused by the FCL quickly and accurately. Results show that FCLs can increase short circuit currents in other branches. High-limiting FCLs may cause larger increase in short circuit currents of other branches and therefore a compromise may have to be made between fault current limitation and the maximum additional currents that are acceptable in other branches. Examples on a three-bus system and an eleven-bus system are presented for illustration and validation.
机译：在本文中，提出了一种数学上严格的方法，可根据短路电流的理想变化来计算FCL的阻抗。该方法基于叠加原理，可以轻松地纳入电力系统的标准短路电流计算中。轻松计算出每个安装的FCL的短路电流的变化，而不必为每种新情况建立新的阻抗矩阵。此外，该方法利用复杂平面中的FCL阻抗轨迹，可以清晰地图形表示FCL对电力系统的影响。结果图为公用事业，系统规划人员和FCL制造商提供了宝贵的见识和信息。 FCL制造商可以使用这些图来确定FCL阻抗值和角度，这些值和角度取决于制造和系统限制。该图还允许公用事业公司和系统规划人员快速准确地计算出由FCL引起的故障电流分布的变化。结果表明，FCL可以增加其他分支中的短路电流。高限制的FCL可能会导致其他分支的短路电流更大地增加，因此可能必须在故障电流限制和其他分支可接受的最大附加电流之间做出折衷。给出了三总线系统和十一总线系统的示例，以进行说明和验证。

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