Abstract

A renewed interest in comprehensive modeling of distribution system components arose in recent literature. This trend can be attributed to, aside from the inherent imbalance of such systems, the rapid and system-wide integration of technologies, e.g. non-linear loads and distributed generators, which further increase grid imbalance effects. Such phenomena, in turn, demand sufficiently detailed models for their proper assessment. Despite the described scenario, it remains reasonable to inquire whether approximate component models can still be used for simplifying computations without causing exceedingly high modeling error. In this context, an approximation of particular interest is assuming phase transposition for distribution lines, due to its property of impedance matrix decoupling on the symmetric component frame. In this paper, the derivation of a closed-form upper bound for voltage drop magnitude error, due to assuming transposition in a general M-phase line, is carried out. The bound is validated by means of a case study based on the IEEE 4-bus feeder considering generalized feeder geometries. Obtained results suggest that the upper bound is tight with respect to actual error and thus provides a practical means of estimating voltage drop error yielded by the assumption of distribution line transposition.

摘要

最近的文献中出现了对配电系统组件综合建模的新兴趣。除了此类系统固有的不平衡外，这一趋势还可归因于技术的快速和系统范围集成，例如非线性负载和分布式发电机，这进一步增加了电网不平衡的影响。反过来，此类现象需要足够详细的模型才能进行适当的评估。尽管描述了这种情况，但仍然有理由询问近似组件模型是否仍可用于简化计算而不会导致极高的建模错误。在这种情况下，由于其在对称组件框架上阻抗矩阵去耦的特性，假设配电线路的相移是特别令人感兴趣的近似。在本文中，M相线，进行。该界限通过基于 IEEE 4 总线馈线考虑广义馈线几何形状的案例研究进行验证。获得的结果表明，上限相对于实际误差是严格的，因此提供了一种估算由配电线换位假设产生的电压降误差的实用方法。