Along with the use of electric vehicles

load level increment as well as load of randomness incapacitates the distribution system from secure and reliable operation. Meanwhile

some distribution districts interfaced with distributed resources possess surplus power supply. Under the circumstances

tie lines can be used to relieve the burden of overloaded districts and mitigate the impact of soaring load on a single district

if these districts are adjacent geographically. When adopting AC tie lines

the rate of load transferred is limited

and electromagnetic looped network is likely to take place. An idea of load transfer by DC tie lines is proposed for achieving the goal of balanced load among different distribution districts

where inverters are adopted to interface different transformer districts with common DC system. Decoupled power control strategy is employed to determine the amount of transfer load in accordance with the corresponding capacity of the distribution transformer. The method proposed can reduce load rate while making it possible to locally accommodating the distributed energy resources. This work is supported by National Natural Science Foundation of China (No. 51407017) and National High Technology Research and Development Program of China (863 Program) (No. 2011AA05A107).