Abstract:In the context of the construction of new power systems and the development of photovoltaic systems throughout the county，the integration of massive distributed photovoltaics （DPV）poses a huge threat to the safe and efficient operation of the distribution network. It is urgent to evaluate the capacity of DPV in the distribution network to quantify the comprehensive impact of high proportion DPV on the distribution network. Firstly，a source load uncertainty model in multiple scenarios is constructed. Secondly，a DPV carrying capacity assessment model is established to determine the maximum capacity of DPV that can be connected to the distribution network. Finally，a DPV capacity evaluation system considering multiple factors is proposed to reflect the operational level of the distribution network，and the scientificity of the proposed method is verified through power grid cases.