Analysis and performance of a permanent-magnet synchronous generator supplying an isolated load

The analysis and performance of a permanent-magnet synchronous generator (PMSG) supplying an isolated load at constant speed is presented. The two-axis model is used for computation of the load characteristics of the PMSG and to study voltage compensation using shunt-connected capacitance. For a more comprehensive study, a time-stepping, coupled field-circuit analysis is developed using a two-dimensional finite element package. The time-stepping finite element analysis is applied to study the steady-state and transient performance of the PMSG when supplying an isolated resistive load. With appropriate modification of the external circuit model, the steady-state performance of a PMSG which supplies a bridge rectifier load is also studied. Voltage regulation characteristics, waveforms and harmonics are investigated. The computed results are verified by experiments on a 2.5 kW PMSG.