Computer-Aided Modeling of a Rectified DC Load-Permanent Magnet Generator System with Multiple Damper Windings in the Natural Abc Frame of Reference

In this paper, a computer-aided modeling method, by which one can analyze and predict the dynamic performance of electronically rectified load-permanent magnet generator systems with multiple damping circuits is presented. Perpetual electronic switching in such systems results in a continuous change in the machine system network topologies. Hence, network modeling of such systems was done here on an instantaneous basis in the time domain. The natural abc frame of reference was used throughout. An advantage of using this approach is that it enables one to directly use readily available abc machine parameters obtained from magnetic field solutions. Thus, the inherent nonlinearities and space harmonics in the flux linkages, inductances, as well as induced emfs are fully accounted for in this modeling and analysis approach. This method was applied to a two-pole, 75 kVA, 208 V, 24000 r/ min permanent magnet generator-3 phase full wave rectifier load system, Figure (1). The resulting model was used to study the generator-load system performance. Details of developing this model are given in the paper. Accordingly, by using generalized concepts of network graph theory in conjunction with hybrid matrix formulation of nonlinear networks, see references [5] and [9] in the paper, the state equations associated with this system were automatically formulated and continuously updated in a computer-aided network solution program.