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大量种类繁多的分布式电源接入可能运行在三相不平衡状态的配电网。分布式电源种类繁多,控制方式多样,并网阻抗等值参数取值范围较宽。前退回代是用于配网潮流计算的重要方法之一。通过数值仿真计算发现，分布式电源三序稳态模型的负序和零序阻抗在一定的取值范围内，会引起前推回代潮流计算发散。进一步分析潮流发散的原理，发现造成发散的原因是前推回代格式的谱半径大于1，并提出一种等值负序和零序阻抗补偿方法解决这一问题。“,”Various distributed generators (DGs) are integrated in distribution system which is usually operated in three-phase unbalanced condition. There are various distributed generator with various control mode. The equivalent interface impedance of DGs may vary within a large range. Backward/forward sweep power flow (FBS) is an important method for distribution system power flow analysis. In this paper, the convergence problem caused by the zero and negative sequence impedance of DGs in forward/backward sweep power flow was found through numerical experiments. The reason of this phenomenon is that spectral radius of FBS is more than 1 and an impedance compensation method is proposed to solve this problem.