a setting-free loss of excitation detection of synchronous generator in the presence of facts device

In this paper, the loss of excitation fault (loe) as one of the most common fault in synchronous generator is analyzed and the methods for detecting this fault are investigated. then, the performance of the power system equipped with statcom is simulated in the matlab / simulink software and the effects of the generator performance on the resistor and its derivatives in the generator terminal are analyzed. a new method for loe detection based on derivative of resistance is proposed. to illustrate the efficiency of this method various sizes and conditions for generator load are considered. the simulation results show that the amount of resistance time derivative in all cases, whether with or without statcom, behaves the same as a new criterion for detecting the loe of an effective and useful method that is faster and more accurate than conventional methods. simulation results in different amount and type of the loads shows the validity of the proposed method.