Abstract:  In order to explore the structure of distribution network with high power supply reliability and adaptive to the operation of distributed generators， our research group proposed a honeycomb topology for active distribution network on the basis of distributed active microgrids. Firstly， this paper makes a brief introduction of the topology and active microgrids and smart power/information exchange base stations in the topology；and advantages and disadvantages of the topology are also analyzed. Secondly， the Markov chain is used to analyze the state transition process of the honeycomb microgrid， and the mathematical models are given， including the state transition probability matrix and the probability calculation method under different states. Thirdly， revised formulas based on the minimum cut set method for calculating the reliability indices of the honeycomb microgrid is derived. Finally， the IEEE-RBTS BUS6 F4 test system is taken as an example， power supply reliability of the system before and after “transformation” into honeycomb microgrid is simulated and compared， and the result shows that the system has higher power supply reliability after “transformation”；furthermore， the power supply reliability of honeycomb active distribution network is obviously better than the ordinary distribution network.

Key words: honeycomb, active distribution network, reliability, smart power/information exchange base station, Markov chain, state transition probability matrix, minimum cut set algorithm