利 用 智 能 电 表 量 测 数 据 的 三 相 四 线 制 配 电 线 路 参 数 辨 识

The parameters of low-voltage distribution lines are the important basis for predicting non-sudden failures and calculating line losses. However, given the insufficiency of information provided by smart meters and the existence of neutral lines, it is difficult to solve the equations for line parameters. Thus, a method for calculating the parameters of three-phase four-wire low-voltage distribution lines is proposed. Initially, the line impedances are assumed to be certain values, and the power loss of each neutral line is analyzed based on the known topology. Subsequently, the transmitted power and the phase angle of the current of each line are calculated, and new electrical quantities are formed using the above phase angles and measured data. Finally, based on the least-square method, the actual line impedances can be computed iteratively. The effectiveness of the proposed method is verified by an example with 20 load nodes and 47 lines.