Topology study of AC-DC hybrid distribution system based on reliability combination calculation

With the increase in the proportion of new energy sources and the wide distribution of DC loads, DC distribution technology is receiving more and more attention. Based on the research of back-to-back flexible DC transmission HVDC DC transmission technology, a hybrid AC-DC distribution system is derived, through the combination of DC and traditional AC distribution networks, the hybrid AC-DC distribution system can reduce the steps of energy conversion and improve the operational efficiency and power quality. To enhance system power supply reliability and mitigate the randomness and volatility introduced by distributed energy sources, this paper first proposes common topologies for hybrid AC-DC distribution systems. It then applies three reliability analysis methods—the minimum path method, Monte Carlo simulation, and convolution integral method—to perform reliability calculations on several typical distribution system topologies. Finally, using the power supply reliability rates obtained from these methods as evaluation criteria, the Hierarchical Analysis Method is employed to determine the optimal architecture for current hybrid AC-DC distribution systems.