Network Analysis and Algorithm of Microgrid Reliability Assessment

Microgrid is profitable to mitigate the expansion pressure of transmission grid and achieve higher reliability at the same time. It also provides an ideal platform for the application of renewable energy. Network characteristics analysis is the basic element in reliability assessment of microgrid. This paper discusses two methods of microgrid construction according to China's distribution system, and constructs a microgrid based on typical 10 kV distribution network. In order to analyze the topology characteristics of a microgrid, two typical kinds of matrices are used to describe the topology of microgrid, and a more common microgrid based on RBTS Bus4 System is established to illustrate four kinds of sub-network type under different conditions. Issues analyzed in this paper clear the structure difference between the microgrid and distribution network. Accordingly, the algorithms suitable to identify the characteristics of network structure in reliability analysis of microgrid are offered. The work in this paper lays a foundation for further reliability assessment of microgrid.