The invention provides a method of calculating charging
load distribution of
electric cars in a power distribution network. The method includes three links: a link of designing upload data of chargingstations, a link of a command for scheduling and calculation of charging power for the power distribution network, and a link that each
charging station distributes charging power, wherein in the link of designing upload data of charging stations: single electric car charging scheme margin and
charging station charging scheme margin are defined and are fitted into a quadratic curve, and then quadratic curve coefficients a, b and c, the number of
electric cars in the charging stations, and the top and bottom limitation of charging power are obtained, and then the quadratic curve coefficients a, b and c, the number of
electric cars in the charging stations, and the top and bottom limitation of charging power form an array, and then the array is uploaded to the power distribution network forscheduling; in the link of a command for scheduling and calculation of charging power for the power distribution network, the uploaded data of each
charging station is scheduled and utilized, and according to the operation management requirement of the power distribution network, such as
peak load shifting, an optimization model is established to calculate the allowed charging power of each charging
station, and the allowed charging power is used as a command to issue to each charging
station; and in the link that each charging
station distributes charging power, the charging stations performpower distribution according to the sequence, from small to large, of the charging scheme margin of each electric car to realize ordered charging management.