In the paper, the special characteristics of the system are emphasized regarding the nature of low frequency oscillations are discussed. This study reveal the emergence of an undamped swing mode involving the interaction of several machines and their ...
In the paper, the special characteristics of the system are emphasized regarding the nature of low frequency oscillations are discussed. This study reveal the emergence of an undamped swing mode involving the interaction of several machines and their controllers. Excitation systems with automatic voltage regulator(AVR) and governors and power system stabilizer(PSS) are installed locally within power plants and used for improvement of power system response to small and large disturbance. However an improperly tuned PSS and AVR could destabilize low frequency oscillation mode. This paper show that it is important to select the coefficients of AVR and PSS.