Method of evaluating reliability of microgrids in Island mode by using load prioritization

This paper presents a method for evaluating reliability when some error occurs in upstream grid and the microgrid is in island mode. Also, a connection matrix for the linkage between grid components as well as a load prioritization matrix for indicating loads priority along with effects of prioritization on reliability indices is recommended. In addition, a failure effect matrix for a feeder over loads of adjacent feeders is provided. Moreover, an algorithm is used to show how the failure effect matrix is obtained. In present paper, a 4-bus RBTS system with microgrids is studied, the reliability of which is analyzed in 3 modes: (i) No microgrids, (ii) with microgrid in island mode without load prioritization, and (iii) with microgrid in island mode with load prioritization; and failure effects on loads are also examined and, for these 3 modes, reliability indices are calculated, indicating that it is improved in the mode of load prioritization.