A Novel Five-Level Transformer-less Inverter Topology with Common-Ground for Grid-Tied PV Applications

Ardashir, Jaber Fallah; Gasemi, Mahdi; Peyghami, Saeed; Rozmeh, Behrouz; Blaabjerg, Frede

doi:10.23919/epe21ecceeurope50061.2021.9570654

Cited by 6 publications

(3 citation statements)

References 28 publications

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“…Figure 3 indicates how multilevel inverters have a wide variety of uses in the emerging field of renewable energy, and Figure 4 exhibits the MLI-based system integration of various renewable energy sources being employed and discussed [109][110][111][112][113]. An MLI is selected for medium-and high-power applications based on its capability to generate voltage waveforms of superior quality while functioning at a low switching frequency [104][105][106][107][108]. Figure 3 indicates how multilevel inverters have a wide variety of uses in the emerging field of renewable energy, and Figure 4 exhibits the MLI-based system integration of various renewable energy sources being employed and discussed [109][110][111][112][113].…”

Section: Grid-connected Solar Photovoltaic Systemmentioning

confidence: 99%

A Review of Multilevel Inverter Topologies for Grid-Connected Sustainable Solar Photovoltaic Systems

Nyamathulla,

Chittathuru

2023

Sustainability

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Solar energy is one of the most suggested sustainable energy sources due to its availability in nature, developments in power electronics, and global environmental concerns. A solar photovoltaic system is one example of a grid-connected application using multilevel inverters (MLIs). In grid-connected PV systems, the inverter’s design must be carefully considered to improve efficiency. The switched capacitor (SC) MLI is an appealing inverter over its alternatives for a variety of applications due to its inductor-less or transformer-less operation, enhanced voltage output, improved voltage regulation inside the capacitor itself, low cost, reduced circuit components, small size, and less electromagnetic interference. The reduced component counts are required to enhance efficiency, to increase power density, and to minimize device stress. This review presents a thorough analysis of MLIs and a classification of the existing MLI topologies, along with their merits and demerits. It also provides a detailed survey of reduced switch count multilevel inverter (RSC-MLI) topologies, including their designs, typical features, limitations, and criteria for selection. This paper also covers the survey of SC-MLI topologies with a qualitative assessment to aid in the direction of future research. Finally, this review will help engineers and researchers by providing a detailed look at the total number of power semiconductor switches, DC sources, passive elements, total standing voltage, reliability analysis, applications, challenges, and recommendations.

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Section: Grid-connected Solar Photovoltaic Systemmentioning

confidence: 99%

A Review of Multilevel Inverter Topologies for Grid-Connected Sustainable Solar Photovoltaic Systems

Nyamathulla,

Chittathuru

2023

Sustainability

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“…Consequently, Fig. 39(e)-(g) shows three different CGSCbased inverter configurations, which are able to generate 5L double voltage conversion gain output using six power switches [127]- [129], seven power switches [132], [144], and eight power switches [135], respectively. Ardashir et al [145] have recently introduced a 5L CGSC-based inverter, which comprises six power switches.…”

Section: Cgsc-based Mlismentioning

confidence: 99%

“…Although it has used a similar virtual dc-link SC technique to create the negative output voltage levels, its overall voltage conversion gain is unity. As for the presented topologies in [127]- [129], [132], and [144], capacitor C 2 acts as a virtual dc-link source, which is required to be charged to the peak voltage of the inverter, 2V dc , through the series connection of the input dc source and the capacitor, C 1 . This charging operation can be realized during the zero and top positive output voltage level generation, which might be troublesome in terms of voltage ripple attenuation of C 2 during the switching process.…”

Section: Cgsc-based Mlismentioning

confidence: 99%

Switched-Capacitor Multilevel Inverters: A Comprehensive Review

Barzegarkhoo

Forouzesh

Lee

et al. 2022

IEEE Trans. Power Electron.

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101

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Multilevel inverters (MLIs) with switched-capacitor (SC) units have been a widely rehearsed research topic in power electronics since the last decade. Inductorless/transformerless operation with voltage-boosting feature and inherent capacitor self-voltage balancing performance with a reduced electromagnetic interference make the SC-MLI an attractive converter over the other available counterparts for various applications. There have been many developed SC-MLI structures recently put forward, where different basic switching techniques are used to generate multiple (discrete) output voltage levels. In general, the priority of the topological development is motivated by the number of output voltage levels, overall voltage gain, and full dc-link voltage utilization, while reducing the component counts and stress on devices for better efficiency and power density. To facilitate the direction of future research in SC-MLIs, this article presents a comprehensive review, critical analysis, and categorization of the existing topologies. Common fundamental units are generalized and summarized with their merits and demerits. Ultimately, major challenges and research directions are outlined leading to the future technology roadmap for more practical applications.

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Single DC-link-based 5-level MLI topology for renewable and grid applications with fewer switches

Tiwari,

Agarwal

2024

Electr Eng

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This article describes a 5-level single DC source multilevel inverter (SDS-MLI) with fewer components and optimum efficiency. Multiple DC source MLI topologies are presently deemed unsuitable for a range of applications, such as renewable energy (RE) conversion systems and grid applications, while single DC source MLI topologies are more suitable. Existing MLI circuits have more active/passive components, but the SDS-MLI design employs a level-doubling network, requires fewer components, and reduces the DC-link voltage for grid applications. The SDS-MLI uses one capacitor, six switches, and a DC supply. A primary control method enforces a well-known phase disposition carrier arrangement to actualize the presented configuration. Existing systems are evaluated based on the number of active and passive components, their efficiency, capacitor voltage, and voltage stress. In comparison to existing topologies, SDS-MLI has fewer components, a lower capacitor voltage, and less TSVs to achieve an efficiency of 98.66%. MATLAB/Simulink and experimental setups are used to verify the SDS-MLI architecture. On the basis of experimental setup and simulation, the number of load voltage & load current waveforms under various situations such as variable load, varied input supply, different frequencies, and different modulation indexes are shown.

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A Novel Five-Level Transformer-less Inverter Topology with Common-Ground for Grid-Tied PV Applications

Cited by 6 publications

References 28 publications

A Review of Multilevel Inverter Topologies for Grid-Connected Sustainable Solar Photovoltaic Systems

A Review of Multilevel Inverter Topologies for Grid-Connected Sustainable Solar Photovoltaic Systems

Switched-Capacitor Multilevel Inverters: A Comprehensive Review

Single DC-link-based 5-level MLI topology for renewable and grid applications with fewer switches

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