Load-Flow in Multiphase Distribution Networks: Existence, Uniqueness, and Linear Models
Load-Flow in Multiphase Distribution Networks: Existence, Uniqueness, and Linear Models
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多相配电网中的潮流：存在性、唯一性和线性模型
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
Changhong Zhao
中科院分区：
文献类型：
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作者：
A. Bernstein;Cong Wang;E. Dall’Anese;J. L. Boudec;Changhong Zhao
本文考虑了一般的不平衡和多相配电系统，并开发了一个基于固定点的解释交流潮流方程的潮流算法。给出了潮流解存在唯一的显式条件。这些条件也保证了潮流算法收敛到唯一的潮流解。所提出的方法扩展了完善的Z总线迭代方法，并且它适用于具有以下特征的通用系统：（i）Y形连接;（ii）不接地三角形连接;（iii）Y形连接和三角形连接的源/负载的组合;以及（iv）配电变压器次级处的线对线和线对中性点设备的组合。线性潮流模型，然后推导出，其近似精度进行了分析。通过IEEE测试馈线上的实验，证实了理论结果。
This paper considers generic unbalanced and multiphase distribution systems and develops a load-flow algorithm based on a fixed-point interpretation of the AC power-flow equations. Explicit conditions for existence and uniqueness of load-flow solutions are presented. These conditions also guarantee convergence of the load-flow algorithm to the unique power-flow solution. The proposed methodology broadens the well-established Z-bus iterative method, and it is applicable to generic systems featuring (i) wye connections; (ii) ungrounded delta connections; (iii) a combination of wye-connected and delta-connected sources/loads; and, (iv) a combination of line-to-line and line-to-grounded-neutral devices at the secondary of distribution transformers. Linear load-flow models are then derived, and their approximation accuracy is analyzed. Theoretical results are corroborated through experiments on IEEE test feeders.