New Measurement of Synchronous Machine Quantities

Synchronous machine quantities are used in the various studies of power system behavior under both normal and abnormal conditions. Instead of the IEEE test code 115 [1] generally employed, this paper describes two approaches to measure synchronous machine quantities of each winding with the machine at standstill, namely, the indicial response method and the low-requency response method. These quantities are directly applicable as various coefficients in Park´s equation of synchronous machine. Comparison with conventional methods and analysis in the short-circuit phenomena lead to the fact that it suffices to consider that both direct and quadrature axes each have one damper circuit and that the time constant of the damper winding and the coupling coefficients between windings can be considered almost constant in the low-frequency region (0-0.1 pu).