引入分布式电源的配电网结构复杂，其配电网线损计算具有新的特点，传统的配电网线损计算方法已不能满足未来分布式发电系统的需求。针对含分布式电源的辐射性配电网开展研究，将常见分布式电源节点划分为PQ节点、PI节点、PV节点和PQ(V)节点几种类型，根据各节点类型的特点，提出了改进前推回推潮流算法，通过33节点算例计算潮流和线损电压，与传统的配电网进行比较，发现了采用异步电机作为接口的分布式电源会降低系统的电压水平，而采用其他形式接口的分布式电源对系统电压具有支撑作用。

The calculation of line loss for complex distribution network with distributed generation has new features.However,the traditional method cannot meet the demand for future distributed generation systems.In this paper,the radial distribution network with distributed generation is investigated.The common distributed power nodes are divided into PQ,PI,PV and PQ (V) types.According to the characteristics of each node type,the improved algorithm of forward and backward for power flow calculation is put forward.The voltage line loss is calculated for taking the system with 33 nodes as an example.Compared with the traditional distribution network,the system voltage is reduced for the distributed generation using asynchronous generator as the interface,while other interface forms play supporting roles to system voltage.