A comparative analysis of loss of excitation protection methods for synchronous generators

Synchronous generators require to be protected against loss of excitation (LOE) because this event threatens the generator and power system stability. Over the years, several methods have been proposed for LOE detection. Thereby, this paper aims to show the performance of the loss of excitation protection methods in synchronous generators. Comprehensive simulation studies of total LOE and partial LOE are accomplished for various generator conditions and system disturbances. The performed studies demonstrate depending of initial generator loading, a partial loss of excitation may damage the machine. Still, in order to test the method's security to Stable Power Swings have been done. The results show that majority of the methods discussed presented difficulties in the detection of partial loss of excitation.