Block Diagram Approach to Power System Reliability

The Markov process concept is used to derive expressions for an equivalent of two units in series and parallel considering two-state conditions of fluctuating normal and stormy weather. These expressions are then used to simplify a system by the series and parallel block reduction technique. It is observed that this technique alone is not sufficient for a system where a complex configuration is involved. For such cases, star-delta conversion in addition to the series and parallel equivalents is used. The results obtained by this technique are compared with those obtained by existing methods. Finally a computer algorithm for system reduction is described.