SYNCHRONOUS MACHINE MODELLING BY STANDSTILL FREQUENCY RESPONSE TESTS.

Abstract

The synchronous machine is modelled in terms of operational impedances derived from standstill frequency response measurements. A curve-fitting procedure in the complex plane yields all parameters, including the armature resistance, without having to preprocess the data or make other measurements. The validity of the model is demonstrated for a microalternator by comparing the sudden short-circuit current predicted by the model with that obtained experimentally. Frequency response data obtained at different current levels are used to show that a useful model can be derived from tests at low per-unit current.