Abstract
This paper extends the concepts of hierarchical level one (HLI) generating unit commitment health analysis to unit commitment in composite generation and transmission systems (HLII). The problem of unit commitment is decomposed into two subproblems. Generating units are first committed to the system based on HLI operating criteria followed by unit commitment evaluation at HLII. The committed capacity should satisfy the operating criteria at both HLI and HLII. Operating reserve evaluation at HLII recognizes the ability of the transmission system to deliver the generated energy to the major load points. This paper presents a procedure to determine the operating state probabilities using a contingency enumeration technique. For a given load level, the required number of committed units and the associated well-being indices at HLI and HLII are determined. The impact of system lead time on the well-being indices are also presented. The results are compared and discussed by application to the IEEE-RTS.