Winding function model of Grid-Connected synchronous Turbo-Generator with damper winding

Abstract

The original dynamic model of the grid-connected synchronous round-rotor generator, also known as synchronous turbo-generator (STG) is presented in the paper. The model is based on the Winding Function (WF) theory and as such it is derived in the natural frame of reference. Depending on the presence or absence of a cage damper winding on the rotor two independent models are derived. The strength and the importance of the derived models lie in the fact that it is possible to consider the real spatial distribution of all the windings in the machine, including the damper winding. The time-dependent currents in all the windings, including the currents in all the bars of the damper cage winding, are the output of the model. In addition, the model execution time on a mid-range computer is a few tens of seconds, which is incomparably faster than the execution time of models based on the Time Stepping Finite Element (TSFE) method, which is measured in days. On the other hand, the results obtained with a completely different and independent TSFE model fully confirm the validity of the results obtained with the proposed WF model.

Keywords

• Damper winding
• Grid-connected generator
• Mathematical modeling
• Synchronous turbo-generator
• Synchronous round-rotor generator
• Time stepping finite element method