Speed control of a grid connected doubly-fed induction generator system for maximum power point tracking with improved input power factor employing matrix converter as a slip power exchanger

Abstract

The paper presents a scheme for the rotor side field oriented control of doubly fed induction generator (DFIG) connected to the power grid. To control the speed, the slip power is exchanged between the grid and the generator through a Matrix Converter connected to the rotor side as power frequency changer. Use of Matrix Converter (MC) helps to increase the input power factor of the overall DFIG system. Based on stator flux oriented control, the dynamic modeling of entire system is implemented in the synchronously rotating reference frame (d-q). The scheme is able to control the active power from the rotor terminals and it also allows the sharing of magnetizing current between stator and rotor. The analysis of the entire scheme and the design of various controllers are discussed. The simulation results are presented to justify the proposed scheme before implementing the scheme in hardware.