【摘要】 为引导能源产业低碳、绿色发展，碳达峰、碳中和战略有序推进，户用分布式光伏容量大幅增长，低压台区线损理论计算变得日益复杂。针对现有含高密度分布式光伏的低压台区线损理论计算方法在快速性、准确性上不能满足台区线损降损要求，提出一种新的基于改进潮流计算的低压台区三相线损理论计算方法。首先，根据逆变器类型对两类分布式光伏电源进行建模，确立PI、PV型光伏节点向PQ节点转化的方案。然后，采用前推回代法计算牛顿-拉夫逊法（简称牛拉法）初始值，并通过梯度下降法修正牛拉法迭代的雅可比矩阵，有效提高计算的精度与速度。最后，以某省实际低压台区所采集的数据为例，验证所提方法在提升台区三相线损理论计算上的正确性与有效性，并应用计算结果指导台区线损精益化管理工作。更多还原

【Abstract】 In order to guide the low-carbon and green development of the energy industry, the strategy of "carbon peaking and carbon neutral" is being promoted in an orderly manner, and the capacity of household distributed photovoltaic is increasing significantly, which makes the theoretical calculation of line loss in low-voltage transformer area increasingly complicated. In view of the shortcomings of the existing theoretical calculation method of low-voltage transformer area containing high-density distributed photovoltaic that cannot meet the requirements of transformer area line loss reduction in terms of rapidity and accuracy, a new theoretical calculation method of three-phase line loss in low-voltage transformer area based on improved power flow calculation is proposed. Firstly, the two types of distributed photovoltaic power supplies are modelled according to the inverter types, and the transformation of PI and PV type distributed photovoltaic nodes to PQ nodes is established. Then, the Newton-Raphson method is used to calculate the initial value of the Newton-Raphson method by the forward back substitution method, and the Jacobi matrix of the Newton-Raphson iteration is modified by the gradient descent method to effectively improve the accuracy and speed of the calculation. Finally, the data collected from an actual low-voltage transformer area in a province is used as an example to verify the correctness and effectiveness of the proposed method in enhancing the theoretical calculation of three-phase line loss in the transformer area, and the calculation results are applied to the lean management of line loss in the transformer areas.更多还原