分布式电源（distributed resources，DR）的接入会对配电网线损产生重要影响，其影响与DR的接入位置、准入容量及功率因数密切相关。基于辐射状单回路配电网网络结构，采用均匀分布恒功率负荷模型，推导出了单个DR接入配电网后线损的减小量与DR接入位置、准入容量、功率因数之间的数学关系，给出了DR最优配置计算公式；通过仿真分析，总结了DR 接入对配网线损的影响规律，并将推导公式推广到多个DR接入配电网的情况。所得的结论为DR接入配电网的最佳运行方式提供了理论依据，为DR的电网规划提供理论指导。

Distributed resources (DR) have important impacts on power loss of distribution network system, including the location, capacity and power factor of DR. Based on radial single circuit network and uniform distribution constant power load model, the mathematical relations between reduction of power loss and location, capacity and power factor of DR were deduced for single DR inserting, and generalized for multiple DR inserting. The optimum location and capacity of DR were obtained. The influence of DR inserting on the power loss of distribution network was simulated and analyzed. The conclusions investigated in this paper provided theoretical references to optimal operation mode and power network planning of DR.