Abstract:With the rapid growth of load and prompt development of distribution generations (DG) in distribution network, traditional distribution network requires to be upgraded to meet the needs of new added load and DG. Based on the traditional medium voltage distribution network with hand in hand wiring method, the reformation scheme of AC/DC hybrid distribution network is proposed using voltage source converter (VSC)-based DC technology. In addition, the structure and control strategy of AC/DC hybrid distribution network are introduced. Taking a power supply region in Liaoning province as an example, the economics of three kinds of reformation schemes, i.e. constructing AC/DC hybrid distribution network, building up AC distribution network, and building up DC distribution network, are compared and analyzed. Analysis proves that AC/DC hybrid distribution network has the lowest operating loss. When operating years of the distribution network is more than 5 years, constructing AC/DC hybrid distribution network has the lowest total investment cost. In the end, the paper summarizes the comprehensive advantages and development prospect of AC/DC hybrid distribution network and then manifests that the AC/DC hybrid distribution network can be a feasible reformation scheme of the distribution network.