A Six-Switch Five-Level Transformer-less Inverter without Leakage Current for Grid-Tied PV System

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

doi:10.1109/ecce47101.2021.9595014

Cited by 8 publications

(6 citation statements)

References 16 publications

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“…The identical capacitors used in the DC links of single-phase MLIs may be used in three-phase systems. Table 7 provides a comparative study of different mid-point-clamped SC-MLIs [187][188][189][190][191][192][193][194][195][196][197]. a.…”

Section: Mid-point-clamped Sc-mlismentioning

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: Mid-point-clamped Sc-mlismentioning

confidence: 99%

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

Nyamathulla,

Chittathuru

2023

Sustainability

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“…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. 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.…”

Section: Cgsc-based Mlismentioning

confidence: 99%

“…Regarding these contributions, many new challenges, design considerations, and practical limitations have been reported. Accordingly, MLIs with the SC concept are developed through different circuit configurations, such as single [19]- [75] and multiple [5], [6], [73], [76]- [91] dc-source structures, mid-point-clamped techniques [92]- [120], and common-grounded (CG)-based topologies [121]- [145]. Their performance is much improved using a hybrid topological design, where other well-known integrated techniques, such as flying-capacitor (FC) [146]- [157] and switchedboost (SB) [158], [159] technologies, are merged with the SC concept.…”

Section: Introductionmentioning

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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“…In this part the proposed inverter is compared with the well-known H5 [11], HERIC [12], Virtual-dc-bus [13], NPC [14], T-type NPC [15], and Flying-Capacitor [16] three-level inverters, from different point of views. All the mentioned inverters are employed in grid-tied PV applications and depicted in Fig.…”

Section: Benchmarking With the Prior-art Pv Invertermentioning

confidence: 99%

“…Although these inverters have successfully caused zero leakage current, they suffer from non-symmetric usage and nonequal power loss of the utilized components. Several common-ground PV inverters are introduced in [15][16][17]. The topological solution for grid-tied transformerless PV inverters are to use neutral point clamped inverters like Neutral point clamped (NPC) and T-type-NPC [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

A Symmetric Switched-Capacitor-Based Basic Inverter Unit for Grid-Connected PV Systems

Jahan

Sarhangzadeh

Ardashir

et al. 2022

IEEE Trans. Power Electron.

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In this paper a new inverter unit is proposed. It is a compact switched-capacitor-based inverter, which is combined of four switches, two diodes and four capacitors. Since this inverter unit is a mid-point-clamped inverter, it can mitigate the capacitive leakage current in many applications. One of the main applications of the proposed inverter is in grid-tied photovoltaic (PV) systems, where the commonmode current brings many challenges. Other than the mentioned feature, the proposed inverter includes the following advantages: i) spontaneous balancing of the voltage across the capacitors without needing any control system or auxiliary circuits, ii) capability of full reactive power transfer, iii) low voltage stress on the capacitors compared to common three-level inverter topologies (NPC, T-type-NPC, FC and etc.), and iv) symmetric switching sequence, which causes a continuous input current. The feasibility and versatility of the proposed inverter unit is validated by experimental tests, which are conducted by using a lab-scale prototype.

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A Six-Switch Five-Level Transformer-less Inverter without Leakage Current for Grid-Tied PV System

Cited by 8 publications

References 16 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

A Symmetric Switched-Capacitor-Based Basic Inverter Unit for Grid-Connected PV Systems

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