Steady-state and transient analysis of self-excited induction generators

The authors describe a method for accurately predicting the minimum value of capacitance necessary to initiate self-excitation with a stand-alone induction generator. Final steady-state self-excitation voltages and frequencies are also calculated for loaded and unloaded operations, taking into account the rotor parameter variations with the frequency. It is shown that the calculated and measured results are in strong agreement, and for the loaded generator they agree considerably more so than when constant rotor parameters are used. The theory is also extended to include the transient build up of voltage during the initiation stage of self-excitation, and the perturbations of the terminal voltage and the stator current which result from load changes.<>