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Title: Feedforward modulation for the neutral-point-clamped converter with confined capacitor voltage ripples and reduced switching power losses
Authors: Beniwal, Neha
Pou, Josep
Ceballos, Salvador
Townsend, Christopher D.
Konstantinou, Georgios
Dehghani Tafti, Hossein
Farivar, Glen G.
Keywords: Engineering::Electrical and electronic engineering
Issue Date: 2020
Source: Beniwal, N., Pou, J., Ceballos, S., Townsend, C. D., Konstantinou, G., Dehghani Tafti, H., & Farivar, G. G. (2020). Feedforward modulation for the neutral-point-clamped converter with confined capacitor voltage ripples and reduced switching power losses. IEEE Transactions on Power Electronics, 35(4), 4426-4438. doi:10.1109/TPEL.2019.2940077
Journal: IEEE Transactions on Power Electronics
Abstract: This paper presents a new modulation technique with feedforward compensation for the three-phase three-level neutral-point-clamped converter. With the proposed technique, the capacitor voltage ripples are allowed to vary within certain limits. This enables an optimised design of the converter since the maximum capacitor voltages are predefined. Furthermore, the proposed modulation technique is able to reduce switching power losses compared to modulation techniques that eliminate capacitor voltage ripples completely. The proposed technique is therefore a trade-off solution between aforementioned techniques and traditional modulation techniques where the capacitor voltage ripples are not limited. In the proposed technique, if the capacitor voltages are within the tolerable specified range, all the phases switch in two consecutive voltage levels in steady state. When the capacitor voltages go beyond the specified limits, one of the three phases is chosen to switch in three levels to inject an appropriate neutral point current for capacitor voltage balance. As the capacitor voltages are allowed to oscillate, the modulation technique is provided with feedforward compensation to avoid producing low frequency distortion on the output voltages of the converter. Experimental results are presented operating under different loading conditions.
ISSN: 0885-8993
DOI: 10.1109/TPEL.2019.2940077
Schools: School of Electrical and Electronic Engineering 
Interdisciplinary Graduate School (IGS) 
Research Centres: Energy Research Institute @ NTU (ERI@N) 
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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