Abstract：The load-transfer after the distribution area fault and mutual power support between distribution

areas can be realized with the flexible interconnection device（FID）based on power electronic devices. Aiming at

the becoming increasingly prominen three-phase unbalance problem，a three-phase current unbalance regulation

control strategy according to the FID mutual power support to the distribution area was proposed，contributing to

the increased equipment utilization efficiency. Firstly，the structure，mathematical model and operation mode of the FID were introduced. Secondly，a three-phase current unbalance regulation control strategy was proposed according to the original mutual power support to the distribution area. The three-phase balance can be realized with the threephase current compensation. Finally，the effectiveness and feasibility of the proposed control strategy were verified by Matlab/Simulink simulation and the hardware-in-loop experiment on StarSim.

      Key words：flexible interconnection device（FID）；mutual power support；distribution area；three-phase

unbalance