Winding Function Model of Stand-Alone Synchronous Turbo-Generator With Damper Winding

Abstract

The original dynamic model of the synchronous round-rotor generator also known as synchronous turbo-generator (STG) in stand-alone mode of operation is developed and presented in the paper. The model is based on Winding Function (WF) theory and as such it is derived in the natural frame of reference. Depending on the presence or absence of a damper winding on the rotor two independent mathematical models are derived. The presented model provides an accurate description of the real spatial distribution of all windings in the machine, including the short-circuited damper cage winding. Currents in all windings of the machine over time, including all bars of the damper winding, are output from the model. Moreover, the time required to run the model on a computer of average performance is measured in minutes, which is unimaginably fast compared to similar models based on the Finite Element Method (FEM). On the other hand, the results obtained with a completely different and independent time stepping FEM based model largely confirm the validity of the results obtained with the proposed model.

Keywords

• Damper winding
• finite element method
• islanding mode of operation
• mathematical modeling
• stand-alone mode of operation
• synchronous round-rotor generator