In view of such problems faced by the present distribution network as serious unbalance of feeder power

frequent heavy load of transformer and difficult upgrade of urban transmission and distribution

the feeder flexible interconnection technology of distribution network based on power electronic technology is studied in this paper.At partial situation

use of flexible multi-state switch instead of traditional connection switch or section switch can realize fast and real-time power flow regulation between adjacent distribution networks

optimize power flow distribution and improve power quality of distribution network.The use of flexible multi-state switch for the achievement of power flow inversion in feeder interconnection of distribution network is further studied.The results of power flow control

power flow inversion and feeder load balancing of flexible multi-state switch are verified by simulation and experiment.