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A bet ract Accurate generator modeling allows for more precise calculations of power system control and stability limits. In this paper, a procedure using a set of measured data f " an on-line plant transient recording and analysis (PTRA) system to develop the synchronous generator model for the Taipower system is described. A continuoustime transfer-function matrix is derived for a popular sixth-order synchronous generator model. In order to accomodate the nature of on-line digital measurementa, the transfer-function matrix is trans formed into a simple discretotime linear regression model. A me* sure of discrepancy between the generator model outputs and the on-line measurements from generators is employed. A modified conjugate gradient method suitable for identifying generator parameters is developed to minimiw the measure of discrepancy, from which a set of accurate generator parameter values can be obtained. The merits of the modified conjugate gradient method include its computational efficiency and numerical reliability. The p r o p d procedure allows simultaneous estimation of all generator parameter values. A detailed algorithm and numerical studies are reported in a companion

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