With the development of DC distribution system

the network structure and operation mode of traditional distribution system have greatly changed. The AC/DC hybrid distribution network will be dominant in the future and poses a new challenge to power flow control and the AC/DC hybrid algorithm. For this reason

a hierarchical power flow control strategy is proposed to carry out orderly voltage control. At the first layer

DC load sharing is realized by the bidirectional converter with droop control

and DC bus voltage is controlled according to the droop control curve

at the second layer

local voltage balance is regulated by the distributed generator

while at the third

regional voltage is controlled by the voltage regulator. Secondly

the Gauss-Newton hybrid algorithm is proposed according to the characteristics of the AC/DC hybrid distribution system to improve the convergence performance of the algorithm. Finally

the test results on a modified IEEE 123-bus system show the validity and correctness of the control strategy and algorithm proposed. This work is supported by National High Technology Research and Development Program of China(863 Program)(No. 2015AA050202)and State Grid Corporation of China(No. PDB17201500073).