Power distribution network coordination control system and method

The invention discloses a power distribution network coordination control system and method. The method comprises the following steps: S2, a coordination controller, according to target output power of each area, controls distributed energy in the area to work so that for each area, under the condition that the output power of each distributed energy does not reach a rated value, at least one from the distributed energy with the lowest generating cost grade works at maximum output power higher than a first preset value while other distributed energy with the lowest generating cost grade works at output power higher than the first preset value; and S3, when the output power of any one of the distributed energy reaches the rated value, the output power of the distributed energy whose output power is smaller than the first preset value is increased until the output power of all the distributed energy is smaller than the rated value, wherein during the increase, the lower the generating cost level is, the higher