Study of asynchronous operation and resynchronisation of synchronous machines by mathematical models

The paper describes two mathematical models for the simulation of laminated-and solid-rotor synchronous machines. Employing these models, machine behaviour during asynchronous operation and the process of resynchronisation have been studied in detail using a general-purpose analogue computer. Results obtained on the analogue computer have been verified by comparison with results obtained on large alternators and on laboratory micromachines. Investigations have been made into the process of pulling into step from the state of steady asynchronous operation, using an entirely different approach, and the process is explained in simple physical terms. The effects of various auxiliary equipments, different machine parameters and system conditions on out-of-synchronous operation and resynchronisation have been studied.