With the rapid development of smart grids

the access of distributed renewable energy to distribution network is now an inevitable trend in the future. A novel integration topology for AC-DC combined distribution network along the same line is proposed

which incorporates a zigzag transformer and a boost chopper to integrate DC power with the existing AC distribution network. The zigzag transformer is utilized to achieve coupling and decoupling of AC and DC power without sensible iron-core saturation due to voltage canceling out on one phase. The boost chopper is used to maintain the DC ratings at each node and achieve DC power flow. A simulation model for the novel topology is set up to prove the feasibility of the proposed topology.