Symmetrical Cascaded Switched-Capacitor Multilevel Inverter Based on Hybrid Pulse Width Modulation

Multilevel inverters have been widely used in various industrial applications such as renewable energy generation and electric vehicles. An improved circuit of symmetrical cascaded switched-capacitor multilevel inverter is proposed so that the reactive power is absorbed by its power supply instead o...

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Auteurs principaux:	Lingling Cao, Jiefeng Lin, Shikai Chen, Yuanmao Ye
Format:	article
Langue:	EN
Publié:	MDPI AG 2021
Sujets:	cascaded multilevel inverter switched-capacitor PWM modulation reactive power Technology T
Accès en ligne:	https://doaj.org/article/9982e908902d41ae9210ac7b3d2e9f12
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id	oai:doaj.org-article:9982e908902d41ae9210ac7b3d2e9f12
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spelling	oai:doaj.org-article:9982e908902d41ae9210ac7b3d2e9f122021-11-25T17:27:29ZSymmetrical Cascaded Switched-Capacitor Multilevel Inverter Based on Hybrid Pulse Width Modulation10.3390/en142276431996-1073https://doaj.org/article/9982e908902d41ae9210ac7b3d2e9f122021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/22/7643https://doaj.org/toc/1996-1073Multilevel inverters have been widely used in various industrial applications such as renewable energy generation and electric vehicles. An improved circuit of symmetrical cascaded switched-capacitor multilevel inverter is proposed so that the reactive power is absorbed by its power supply instead of capacitors. Then, a special hybrid pulse width modulation strategy combing level-shifted pulse width modulation (LS-PWM) and phase-shifted pulse width modulation (PS-PWM) was developed for the inverter. With this modulation algorithm, the power between cascaded units is automatically balanced, and the voltage of the capacitor in each unit is also automatically balanced to the dc input voltage. In addition, the optimized capacitor voltage ripple makes it possible to use a smaller capacitor to produce a better output voltage waveform. Theoretical analysis, simulation and experimental results show that the equivalent switching frequency of the cascaded multilevel inverter is twice the original frequency so that the output voltage harmonics are only distributed near even multiples of the carrier frequency.Lingling CaoJiefeng LinShikai ChenYuanmao YeMDPI AGarticlecascaded multilevel inverterswitched-capacitorPWM modulationreactive powerTechnologyTENEnergies, Vol 14, Iss 7643, p 7643 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	cascaded multilevel inverter switched-capacitor PWM modulation reactive power Technology T
spellingShingle	cascaded multilevel inverter switched-capacitor PWM modulation reactive power Technology T Lingling Cao Jiefeng Lin Shikai Chen Yuanmao Ye Symmetrical Cascaded Switched-Capacitor Multilevel Inverter Based on Hybrid Pulse Width Modulation
description	Multilevel inverters have been widely used in various industrial applications such as renewable energy generation and electric vehicles. An improved circuit of symmetrical cascaded switched-capacitor multilevel inverter is proposed so that the reactive power is absorbed by its power supply instead of capacitors. Then, a special hybrid pulse width modulation strategy combing level-shifted pulse width modulation (LS-PWM) and phase-shifted pulse width modulation (PS-PWM) was developed for the inverter. With this modulation algorithm, the power between cascaded units is automatically balanced, and the voltage of the capacitor in each unit is also automatically balanced to the dc input voltage. In addition, the optimized capacitor voltage ripple makes it possible to use a smaller capacitor to produce a better output voltage waveform. Theoretical analysis, simulation and experimental results show that the equivalent switching frequency of the cascaded multilevel inverter is twice the original frequency so that the output voltage harmonics are only distributed near even multiples of the carrier frequency.
format	article
author	Lingling Cao Jiefeng Lin Shikai Chen Yuanmao Ye
author_facet	Lingling Cao Jiefeng Lin Shikai Chen Yuanmao Ye
author_sort	Lingling Cao
title	Symmetrical Cascaded Switched-Capacitor Multilevel Inverter Based on Hybrid Pulse Width Modulation
title_short	Symmetrical Cascaded Switched-Capacitor Multilevel Inverter Based on Hybrid Pulse Width Modulation
title_full	Symmetrical Cascaded Switched-Capacitor Multilevel Inverter Based on Hybrid Pulse Width Modulation
title_fullStr	Symmetrical Cascaded Switched-Capacitor Multilevel Inverter Based on Hybrid Pulse Width Modulation
title_full_unstemmed	Symmetrical Cascaded Switched-Capacitor Multilevel Inverter Based on Hybrid Pulse Width Modulation
title_sort	symmetrical cascaded switched-capacitor multilevel inverter based on hybrid pulse width modulation
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/9982e908902d41ae9210ac7b3d2e9f12
work_keys_str_mv	AT linglingcao symmetricalcascadedswitchedcapacitormultilevelinverterbasedonhybridpulsewidthmodulation AT jiefenglin symmetricalcascadedswitchedcapacitormultilevelinverterbasedonhybridpulsewidthmodulation AT shikaichen symmetricalcascadedswitchedcapacitormultilevelinverterbasedonhybridpulsewidthmodulation AT yuanmaoye symmetricalcascadedswitchedcapacitormultilevelinverterbasedonhybridpulsewidthmodulation
_version_	1718412363579785216

Symmetrical Cascaded Switched-Capacitor Multilevel Inverter Based on Hybrid Pulse Width Modulation

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