A Grid Connected Open-end Winding Induction Generator System with Series Compensation

This paper presents a new grid connected induction generator system having open-end stator windings with a series compensator (voltage source inverter (VSI) connected in series) for reactive power compensation. The proposed scheme consists of a two-level capacitor fed voltage source inverter connected to one side of the windings of the induction generator while the other end of the windings are connected to the grid. A current oriented control scheme is developed to control the operation of the VSI to ensure that it compensates the reactive power required by the induction generator. Thus the induction generator system can supply active power to the grid without drawing reactive power from it for excitation. Unlike the shunt compensated induction generator systems, the proposed scheme does not require an interfacing inductor for connecting to the grid thereby reducing the hardware footprint. The proposed scheme is validated by simulation using PLECS software and the simulation results are presented in the paper.