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Title: Band-limited three-level modulation for balancing capacitor voltages in neutral-point-clamped converters
Authors: Beniwal, Neha
Townsend, Christopher David
Farivar, Glen Ghias
Pou, Josep
Ceballos, Salvador
Dehghani Tafti, Hossein
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2020
Source: Beniwal, N., Townsend, C. D., Farivar, G. G., Pou, J., Ceballos, S., & Dehghani Tafti, H. (2020). Band-limited three-level modulation for balancing capacitor voltages in neutral-point-clamped converters. IEEE Transactions on Power Electronics, 35(9), 9739-9754. doi:10.1109/TPEL.2020.2969452
Journal: IEEE Transactions on Power Electronics
Abstract: In this paper, a band-limited three-level modulation scheme is proposed for a three-phase neutral-point-clamped (NPC) converter with an aim to balance the average capacitor voltages under all operating conditions. When conventional carrier-based pulsewidth modulation is applied, the amplitude of neutral point (NP) voltage ripple tends to increase under linear imbalances, while the NP voltage can shift leading to instability in the presence of nonlinear loads. A previously proposed three-level modulation scheme was able to eliminate all low-frequency capacitor voltage ripple by switching a phase between three levels in each switching period. This approach significantly increased switching loss. The proposed modulation scheme limits the increase in switching loss by employing two operational bands, one fixed band applied to the capacitor voltages and another variable band applied to the phase currents. If the instantaneous capacitor voltages exceed the voltage band, then an appropriate phase-leg is switched in three-levels to guarantee the capacitor voltages cannot diverge further. If the instantaneous capacitor voltages reside within the voltage band, a variable current band is used to regulate switching in three voltage levels in order to obtain lower switching losses as compared to the conventional three-level modulation scheme. Therefore, the proposed modulation scheme presents a trade-off between switching losses and capacitor voltage ripple. Experimental results are obtained under different loading conditions for validating the performance of the proposed modulation scheme.
ISSN: 0885-8993
DOI: 10.1109/TPEL.2020.2969452
Rights: © 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The published version is available at:
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:IGS Journal Articles

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