Performance prediction and design modifications of superconducting generators using parameter sensitivity analysis results

Many significant parameters of the superconducting alternator vary considerably from that of a conventional generator because of the rotating shields and very long field time constants. The effects of these parameter values on the dynamic performance of superconducting alternators could be obtained using parameter sensitivity analysis results. Here, results from a companion paper by A.H.M.S. Ula, J.M. Stephenson, and P.J. Lawrenson (see ibid., vol.3, no.1, p.179-86, 1988) are used to predict the dynamic performance of a 2000 MVA superconducting alternator, first with a single rotor screen and then with double rotor screens. It is shown how the parameter survey results can be used for design modifications resulting in significantly improved dynamic performance. Finally, a novel design which further improves the dynamic performance of the alternator is presented