TRANSIENT PERFORMANCE OF A 5-PH BRUSHLESS DC GENERATOR

Gerges, W. R.; Kettleborough, J. G.; Smith, I. R.

doi:10.21608/asat.1991.25844

TRANSIENT PERFORMANCE OF A 5-PH BRUSHLESS DC GENERATOR

Document Type : Original Article

Authors

¹ Lecturer, The Air Defence Academy, Alexandria, Egypt.

² S. Lecturer, University of Technology, Loughborough, England.

³ Head of Electricl Department, University of technology, Loughborough, England.

10.21608/asat.1991.25844

Abstract

The paper studies the transient performance of a 28 V, 14 KW brushless 5-phase DC genertor, with its associated automatic voltage regulator (AVR). The study describes the performance of the generator when subjected to sudden increase and sudden decrQase in load as well as the case when the generator is connected to a dynamic load which may regenerate power into the generator. A mathematical model is developed for the system to enable these studies to be
carried out. Modelling of the generator/rectifier and exciter/rectifier arrangements is achieved using tensor methods to define the changing conduction pattern of the diodes in the rectifier bridges owing to the local ocnditions and the changing magnitudes of the armature voltages. The AVR is modelled in terms of the actual configuration, rather than by the more familiar transfer function approach, and the resulting differential equations are integrated together with those for the generator and the exciter. Experimental results are presented in excellent agreement with those from the computer predictions, thereby validating the model and illustrating its use as a valuable tool for engineers involved in the design of control systems containing electrical machines.