Control scheme of stand-alone doubly fed induction generator for DC voltage applications

This paper presents a control strategy for a stand-alone Doubly Fed Induction Generator (DFIG) in DC voltage applications. In the proposed topology, the stator of the DFIG is connected to a DC load through a diode rectifier, while the rotor is connected to the DC load through a voltage source IGBT inverter. This topology allows the integration of DFIG in the hybrid system with other electric sources and storage devices connected to the same DC bus. The field oriented control strategy is adopted to control the voltage source IGBT inverter in order to maintain constant voltage and frequency at the output of the generator under variable load. A control strategy has been implemented by using dSpace DS1104 control board based on TMS320F240 real time digital signal processor (DSP). Simulation and experimental results are presented in this paper to validate the proposed control strategy.