Title :
Current Regulation in Four-Leg Voltage-Source Converters
Author :
Dong, Gan ; Ojo, Olorunfemi
Author_Institution :
Siemens Energy & Autom. Inc., Alpharetta
Abstract :
Three-phase four-leg voltage-source converters by virtue of the fourth leg connected to the neutral points of the wye-connected loads effectively handle the zero-sequence currents and voltages occasioned by connected load impedance imbalances and/or nonlinearity of loads. This paper develops a generalized carrier-based pulsewidth-modulation scheme for this converter which with a natural reference-frame control scheme that directly controls the actual load currents ensures current regulation irrespectively of the nature of the load. The proposed modulation and control schemes are effectively validated by computer simulation and experimental results for the converter operation in the linear and overmodulation regions.
Keywords :
power convertors; pulse width modulation; carrier-based pulsewidth-modulation scheme; current regulation; load impedance imbalances; three-phase four-leg voltage-source converters; zero-sequence currents; zero-sequence voltages; Current control; Gallium nitride; Impedance; Leg; Pulse width modulation; Pulse width modulation converters; Space vector pulse width modulation; Support vector machine classification; Support vector machines; Voltage control; Current regulation; four-leg voltage-source converter; natural reference frame controller;
Journal_Title :
Industrial Electronics, IEEE Transactions on
DOI :
10.1109/TIE.2007.895140
