Evaluation of maximum power supply carrying capacity of medium-voltage distribution network considering feeder segment transfer

An evaluation method for the maximum power supply carrying capacity of the medium-voltage distribution network considering the sectionalized transfer of feeders is proposed to determine the accurate load transfer scheme, avoid overloading of feeders and ensure the stable operation of the medium-voltage distribution network. Taking feeder and main transformer as the starting point, under the premise of considering the necessity of feeder sectionalized transfer when analyzing N − 1 fault, an evaluation model for the maximum power supply carrying capacity of medium-voltage distribution network is constructed, which takes the maximum sum of all feeder sectionalized loads of distribution network as the objective function and meets the feeder, main transformer capacity and N − 1 constraints. After solving the model, the feeder sectionalized load, load distribution of main transformer and optimal load transfer scheme. The experimental results show that the maximum power supply carrying capacity of the medium-voltage distribution network determined by this method is 221.78 MVA, and the upper limit error of its power supply carrying capacity is only 1.22 MVA; the determined load transfer scheme can ensure that the main transformer and feeder are not overloaded; the model operation efficiency is outstanding.