NDLI: Optimal selective harmonic elimination for cascaded H-bridge-based multilevel rectifiers

Content Provider	IET Digital Library
Author	Marzoughi, Alinaghi Imaneini, Hossein
Abstract	In medium-voltage medium- and high-power converters, it is of great importance to reach high-quality waveforms with low switching frequency. In active rectifiers, both converter's ac-side harmonics and grid preexisting distortions affect the quality of the input current, which according to the existing standards is restricted from both the individual harmonics amplitude and total harmonic distortion point of view. The well known selective harmonic elimination pulse-width modulation technique is able to completely eliminate certain harmonics from the ac-side voltage of the converter, and as a result increases the quality of the input current. In this study, an optimal selective harmonic elimination control strategy is introduced for cascaded H-bridge (CHB) rectifiers. By fully manipulating the ac-side waveform of the rectifier, maximum number of harmonics is eliminated for a specific number of switching transitions. Moreover, this method can be easily extended for any number of H-bridge cells and it uses only one lookup table for the whole interval of modulation index. Also using an effective voltage balancing technique, dc-link voltages are balanced to the reference value and the rectifier does not encounter any difficulty under equal or non-equal loads conditions. Using this method, the size of the bulky line-side filters can be reduced which leads to lower overall cost of implementation. To prove the feasibility of the proposed scheme, simulation and experimental results for a seven-level CHB-based rectifier are reported.
Starting Page	350
Ending Page	356
Page Count	7
ISSN	17554535
Volume Number	7
e-ISSN	17554543
Issue Number	Issue 2, Feb (2014)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/7/2
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2013.0044
Journal	IET Power Electronics
Publisher Date	2013-08-21
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Active Rectifier Bulky Line Side Filter Cascaded H-bridge-based Multilevel Rectifier CHB-based Rectifier Control of Electric Power System Converter AC-side Harmonics Grid Preexisting Distortion H-bridge Cell Harmonic Distortion Harmonics Harmonics Amplitude Lookup Table Modulation Index Optimal Selective Harmonic Elimination Control Power Converter Power Grid Power Harmonic Filter Power Supplies to Apparatus Power Supply Quality Power System Control Pulse Width Modulation PWM Power Converter PWM Rectifier Switching Converter Switching Transition Total Harmonic Distortion Voltage Balancing Technique Waveform Analysis
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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