A proposal for the improvement of electrical energy quality by energy storage in flywheels applied to synchronized grid generator systems

Abstract

In its industrial application, three-phase induction motors are subject to the drive of high inertial loads. This fact results in the storage of kinetic energy during their operation. Thereby, this work presents a method to connect the electric grid of a Squirrel Cage Induction Generator rotor (SCIG) coupled to a cylindrical flywheel of high inertial content to reduce small disturbances in the electric grid. The proposal is validated by means of experimental tests on a bench using toroidal inductors to mitigate the effects of the current transients in the injection of kinetic energy converted into electrical energy in the grid. The results showed that this system can supply a short-time undervoltage disturbance of up to 0.2 pu three-phase and 0.4 pu per phase.