NDLI: Optimised harmonic elimination modulation extended to four-leg neutral-point-clamped inverter

Content Provider	IET Digital Library
Author	Sharifzadeh, Mohammad Sheikholeslami, Abdolreza Vahedi, Hani Ghoreishy, Hoda Labbé, Philippe Alexandre Haddad, Kamal Al
Abstract	Uninterruptible power supply (UPS) is the promising candidate to ensure high quality of delivering power from renewable energy resources to the AC loads especially sensitive and critical ones. In this study, optimised harmonic elimination modulation technique is extended to four-leg neutral-point-clamped (NPC) with neutral point voltage balancing and it has been experimentally validated. It is demonstrated that by controlling the fourth leg to eliminate more harmonics while operating at low switching frequency makes the four-wire NPC an ideal candidate for an UPS application in energy conversion systems. Non-triplen, 5th to 23rd harmonics orders from the output voltage waveforms are eliminated by optimally computing the switching angles for phase legs. Moreover, switching angles computed for the fourth leg are also considered to help removing triplen harmonics containing 3rd, 9th, 15th, and 21st orders from phase voltages. It is mathematically proved that the designed selective harmonic elimination technique ensures the neutral point voltage balancing. The obtained experimental results confirm the proper performance of the proposed technique in supplying symmetrical/asymmetrical loads from renewable energy resources while keeping the inverter neutral point voltage balanced.
Starting Page	441
Ending Page	448
Page Count	8
ISSN	17554535
Volume Number	9
e-ISSN	17554543
Issue Number	Issue 3, Mar (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/9/3
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2015.0022
Journal	IET Power Electronics
Publisher Date	2016-03-09
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	AC Loads Asymmetrical Load Supply Energy Conversion System Four-leg Neutral-point-clamped Inverter Four-wire NPC Harmonics Harmonics Suppression Invertors Low Switching Frequency Neutral Point Voltage Balancing Nontriplen Harmonics Order Elimination Optimised Harmonic Elimination Modulation Technique Phase Legs Power Delivery Power Supply Quality Renewable Energy ReSource Renewable Energy Source Selective Harmonic Elimination Technique Switching Angles Symmetrical Load Supply Uninterruptible Power Supplies Uninterruptible Power Supply UPS
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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