Dual Converter Operating with Floating Capacitors Connecting Open-End Winding Doubly-Fed Induction Generator to the DC Microgrid

• Published in: IEEE transactions on industry applications Vol. 59; no. 5; pp. 1 - 12
• Main Authors: Soares, Emerson L., Jacobina, Cursino B., Rocha, Nady, Melo, Victor Felipe M. B.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.09.2023; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Active and reactive power control; Capacitors; Coils (windings); Configurations; dc micro- grid; Distributed generation; Doubly fed induction generators; doubly-fed induction generator (DFIG); Electric power loss; floating capacitors voltage control; Generators; Harmonic distortion; Induction generators; Microgrids; Power control; Pulse duration modulation; Pulse width modulation; Stator windings; Stators; Topology; Voltage control; wind energy conversion systems (WECS); Winding
• ISSN: 0093-9994; 1939-9367
• DOI: 10.1109/TIA.2023.3288079

This paper presents a novel configuration to connect a three-phase doubly-fed induction generator (DFIG) to the dc microgrid. The proposed topology connects an uncontrolled con- verter and a full-controlled converter in series with the generator stator windings in an open-end winding (OEW) configuration. The full-controlled converter is connected to an independent dc link based on floating capacitors. The paper discusses the converter operating principles, pulse-width modulation (PWM), DFIG power control, and the floating capacitors' voltage reg- ulation. The work compares the proposed and conventional systems regarding current harmonic distortions, torque ripple, and semiconductor losses. Simulations and experiments show steady-state and transient results for a 0.56-kW DFIG operating at the rated power. Finally, it was verified that the proposed topology presents lower power losses and low-distorted voltages and currents over the DFIG stator windings.