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Research on the unbalance degree of four-circuit overhead lines on the same tower with different phase sequence arrangements

机译：相序不同的同塔四回路架空线不平衡度研究

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摘要

The phase sequence arrangements of multi-circuit overhead lines on the same tower, commonly used in extremely high voltage/ultra-high voltage (EHV/UHV) transmission lines, directly affects the symmetry of power transmission systems, which influence the operation of power grid and relay protection. It is difficult to achieve complete transposition of four-circuit overhead lines on the same tower because of their complex structure, and it is a practical and effective way to select a proper phase sequence arrangement to improve the symmetry of the line parameters. This paper presents an evaluation index based method for evaluating the symmetry of four-circuit overhead lines on the same tower and selecting the optimal phase sequence arrangement. First, the unbalance degrees of the single-sequence component and composite-sequence component are defined as the basic evaluation index of the symmetry of the parameters and obtained by the calculation of the line sequence parameters. Furthermore, the unbalance degree comprehensive evaluation index is constructed by the weighted sum based on the ranking of basic evaluation indexes. The weight distribution factors of various unbalance degrees are calculated according to the exponential (0,2) scale algorithm. The unbalance degree comprehensive evaluation index is used to evaluate the symmetry of transmission line parameters and select the optimal phase sequence arrangements of four-circuit overhead lines on the same tower. Finally, the optimal phase sequence arrangements for the different towers with typical structures, such as vertical, horizontal, d-type and e-type towers are obtained by using the above analysis method and verified by simulation of PSCAD/EMTDC.
机译：通常在极高电压/超高压（EHV / UHV）输电线路中使用的同一塔上的多回路架空线的相序安排直接影响输电系统的对称性，从而影响电网的运行和继电保护。由于四回路架空线结构复杂，难以在同一塔架上完成换位，因此，选择合适的相序排列以提高线路参数的对称性是一种实用有效的方法。本文提出了一种基于评估指标的方法，用于评估同一铁塔上四回路架空线的对称性，并选择最佳的相序安排。首先，将单序列分量和复合序列分量的不平衡度定义为参数对称性的基本评估指标，并通过计算线序参数来获得。此外，基于基本评价指标的排名，通过加权和构建不平衡度综合评价指标。根据指数（0,2）标度算法计算各种不平衡度的权重分布因子。不平衡度综合评价指标用于评价输电线路参数的对称性，选择同一塔上四回路架空线的最佳相序安排。最后，利用上述分析方法得到了具有典型结构的不同塔架（如垂直，水平，d型和e型塔架）的最佳相序安排，并通过PSCAD / EMTDC的仿真进行了验证。

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