Lumped modelling of open-circuit turbogenerator operational parameters

• Published in: IEEE transactions on energy conversion Vol. 14; no. 3; pp. 347 - 353
• Main Authors: Arjona L., M.A., MacDonald, D.C.
• Format: Journal Article
• Language: English
• Published: IEEE 01.09.1999
• Subjects: Cross sections; Curve fitting; Damper windings; Electromagnetic analysis; Electromagnetic induction; Electromagnetic measurements; Equivalent circuits; Finite element method; Finite element methods; Frequency dependence; Frequency domain analysis; Mathematical analysis; Mathematical models; Networks; Solid modeling; Terminals; Turbogenerators
• ISSN: 0885-8969; 1558-0059
• DOI: 10.1109/60.790881

Solid-rotor turbine-generators have commonly been derived from the fitting of curves to terminal characteristics obtained by measurement or from finite element simulations. The paper presents a new method to represent the open-circuit operational inductances of a large turbogenerator of 150 MVA. The method differs from current estimation techniques because the lumped model and its parameters are determined simultaneously. It is based on a finite-element electromagnetic linear analysis of the solid-rotor machine cross section in the frequency domain. Network theory is used to characterise the quadrature-axis model where the problems of model structure and parameter determination are treated. A q-axis equivalent circuit with one damper winding and frequency dependent parameters is found. In addition, an analysis of the machine d-axis is presented. It is based in an electromagnetic study of the "black box" two-port network, where the open-circuit operational inductances are represented by frequency dependent parameters.