The invention relates to a maximum power permeability calculation method for a
distributed power supply in connection to a power distribution network. The maximum power permeability calculation method is characterized by comprising the steps that 1), for the maximum power permeability for the
distributed power supply in connection to the power distribution network, the maximum power permeability of a medium-
voltage distribution line is taken in consideration, and the maximum power permeability in a main
transformer power supply region is taken in consideration as well; the maximum power permeability of the medium-
voltage distribution line refers to a specific value between the maximum installed gross capacity of the
distributed power supply and the maximum transmission capacity of the distribution line in the distribution line; the permeability in the main
transformer power supply region refers to a specific value between the installed capacity of the distributed power supply and a main
transformer rated capacity in the main transformer power supply region; and 2), the line intercepting amount constraint, the node
voltage constraint and the
busbar short circuit current constraint are comprehensively taken into consideration. According to the maximum power permeability calculation method, the different positions of the distributed power supplies of different types in connection to the power distribution network are illustrated and compared, so that the maximum power permeability of the distributed power supply in connection to the power distribution network is further optimized, and a technical scheme and calculation evidence for the distributed power supply in connection to the power distribution network widely and massively are provided.