Accuracy improvement for complex harmonic analysis modelling of a wound field synchronous generator

Abstract

Complex harmonic analysis (CHA) provides a computationally efficient alternative to finite element analysis (FEA) for modelling multi-phase wound field synchronous machines. This paper presents three methods that could improve the accuracy of the CHA: by improving the equivalent air gap, by including a saturation factor, and by using image methods for computing end-winding inductance. The comparison against a finite element method and experiment shows the improved complex harmonic method could predict waveforms reliably, where a dynamic finite element method would be time-consuming. This paper shows the method is valid for a five-phase generator.

Keywords

• synchronous generators
• harmonic analysis
• finite element analysis
• air gaps
• synchronous machines
• machine windings
• accuracy improvement
• complex harmonic analysis modelling
• wound field synchronous generator
• CHA
• computationally efficient alternative
• element analysis
• multiphase wound field synchronous machines
• equivalent air gap
• saturation factor
• image methods
• end-winding inductance
• improved complex harmonic method
• dynamic finite element method
• five-phase generator