A study on voltage fluctuations induced by electromechanical oscillations in distributed generation systems with power factor control

This paper focuses on analyzing the impact of electromechanical oscillations caused by distributed synchronous generators (with power factor control) on distribution systems from the power quality point of view. The electromechanical oscillations are natural responses of synchronous generators to a mismatch in their net torques, and thus, are present in every distribution system equipped with such generators. In this work, a previously established methodology is applied to analyze the induced phenomena, which are related to voltage fluctuations. This methodology is used to the power quality assessment of a real power distribution system from Brazil. The obtained results show that electromechanical oscillations in distribution systems can indeed be a significant source of power quality problems, especially regarding voltage fluctuations, even when power factor (instead of terminal voltage) control is performed on the field circuit of the machine.