RELIABILITY EVALUATION OF INTERCONNECTED POWER-SYSTEMS INCLUDING JOINTLY OWNED GENERATORS
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This paper presents a new approach for reliability evaluation of interconnected power systems including jointly owned generators. In this approach, all the jointly owned generators are first combined to form a generation model of these units. Then the rest of the generation model is combined with this jointly owned units (JOUs) generation model and load model to form composite generation model. The transmission model is modified to account for flows due to JOUs. This modified transmission model along with the composite generation model forms the system state space. There are some negative capacity states (inadequate transfer capacity states) in the modified transmission model which are carried over to the system state space. The system state space is decomposed into disjoint subsets, in which one subset contains only the positive states of transmission lines and the rest of the subsets contains one or more ITC (inadequate transfer capacity) states in one or more transmission lines. The subset containing only the positive states of transmission lines is decomposed using the Simultaneous De composition-simulation (SiDeS) approach and the indices are computed. The rest of the subsets are decomposed with a new approach developed to accommodate ITC states in the transmission lines. In the final phase, simulation is performed on all non-decomposed U-sets and overall reliability indices are computed. This method gives results which are very close to the results obtained by the state-by-state analysis. The state-by-state analysis is, of course, impractical for real sized systems. 1993 IEEE
