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This paper presents an approximate model for computing the peak demand power in a metro railway system.The peak demand of substations can be calculated using the current vector iteration method. But the existing methodrequires many repeated calculations to determine the peak demand power, which makes it difficult to apply to the real-timepeak power control problem. In this paper, we assume that none of the conditions vary except source impedance and makean approximate model for rapid calculation based on changes in the impedance of the power substation. The proposedmodel result is approximately the same as the existing model, which is demonstrated through simulation Keywords : Peak demand, Approximate model, Metro railway, Rectifier source       .                        .                .              .

Approximate Model for Peak Demand Power Computation in Metro Railway with DC Rectifiers