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T.Bharath Kumar
M.Ramamoorty M.Ramamoorty
O.Chandra Sekhar


The reliability of the electrical power networks is essential for the continuous power supply to the consumers. The assessment of reliability in interconnected power systems is complex in nature due to the large number of components and network topology. In this paper, a new approach based on electrical circuit analogy for reliability modelling of power system is presented. This electrical circuit approach for the reliability modelling gives the probability of power availability at the load bus. This is one of the reliability indices used to assess the quality of power system. In this analysis two methods are proposed one through Series-parallel equivalent and star- delta conversion approach and another method is based on classical node elimination approach. The Classical node elimination method is used for power system analysis and has not been used so far for reliability analysis. This is the first time the classical node elimination method for reliability analysis in interconnected power system is adapted. The Electrical circuit approach is also helpful to find the System Average Interruption Duration Index (SAIDI) and Customer Average Interruption Duration Index (CAIDI) if the relevant data for each customer served by the load bus is known. The IEEE 6-bus system is used as an example to obtain the probability of power availability at the load bus in this paper. The result obtained from both methods shows the effectiveness of the proposed electrical network approach. The a

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