Generator Models Established by Frequency Response Tests on a 555 MVA Machine

An accurate model of a turbogenerator is required for excitation and transient stability studies. Frequency response tests have been made on a 555 MVA unit to determine direct and quadrature axis transfer functions under operating conditions. Digital and analog computations were performed on line in the course of system tests. The performance of the model derived from the test results compares satisfactorily with the behaviour observed in service.