Four-wire low voltage power network dataset

In most existing low voltage network datasets, the impedance data is approximate, with the following two approximations being commonly applied: 1. a Kron-reduction, which assumes that the neutral wire is grounded everywhere; 2. discarding off-diagonal elements of the series impedance matrix in sequence coordinates. This dataset, contains four-wire variants of low voltage networks for power flow simulation purposes. This means the impedance matrices associate with the lines have size 4x4 and are defined in the wire coordinate space. Furthermore, it contains approximations derived from the four-wire network models, with 3x3 impedance matrices, including Kron-reduced, phase-to-neutral, and modified-phase-to-neutral transformations.现有绝大多数低压电网数据集的阻抗数据均采用近似处理方式，常用近似手段分为以下两类： 1. 克朗降阶（Kron-reduction）：该方法假设中性线处处接地； 2. 舍弃序坐标系下串联阻抗矩阵的非对角元素。 本数据集面向潮流仿真需求，收录了低压电网的四线制变体模型。此类模型所关联的线路阻抗矩阵维度为4×4，且定义于线坐标系空间中。 此外，本数据集还包含基于四线制电网模型推导得到的近似模型，其阻抗矩阵维度为3×3，涵盖克朗降阶、相-中性线变换以及改进型相-中性线变换三类形式。