Filter-Clamped Two-Level Three-Phase Transformerless Grid-Connected Photovoltaic Inverter for Leakage Current Reduction

Rahimi, Ramin; Farhadi, Masoud; Moradi, Gholam Reza; Farhangi, Babak; Farhanai, Shahrokh

doi:10.1109/kpec47870.2020.9167569

Cited by 17 publications

(9 citation statements)

References 43 publications

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“…PV inverters are broadly categorized based on their topologies into two types: transformer-based [2,3] and transformerless [4,5,6,7,8,9]. Transformer-based inverters have traditionally been used due to their proven reliability and electrical isolation capabilities.…”

Section: Introductionmentioning

confidence: 99%

“…A three-phase inverter based on neutral-point capacitance is proposed, which connects the AC and DC sides' neutral point by a capacitor [8]. A new inverter using a two-stage filter-clamped topology is studied by R. Rahimi, which doesn't require any additional components [9]. This paper focuses on the topological characteristics and switching modulation methods of several novel three-phase PV inverters and their overall performance in suppressing leakage current and reducing costs.…”

Section: Introductionmentioning

confidence: 99%

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Innovative approaches for minimizing leakage current in three-phase transformerless PV inverters

Wang

2024

J. Phys.: Conf. Ser.

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Three-phase transformerless photovoltaic (PV) inverters are widely used in solar systems due to their advantages, such as relatively low cost, small size, and high performance. However, they encounter leakage current problems, which can lead to issues such as harmonic damage, grid distortion, and safety risks to individuals. Effectively suppressing leakage current is a critical issue that needs to be addressed for transformerless PV inverters. The purpose of this research is to review advancements made in suppressing leakage current over the past few years in the research area of three-phase transformerless photovoltaic inverters. By summarizing recent research, this paper presents several topologies that efficiently eliminate system leakage current. Additionally, this paper analyzes optimal modulation methods for these topologies in detail. Through a comparison of these topologies, this paper offers insights for future photovoltaic system design. Furthermore, this paper suggests methods to effectively suppress leakage current, reduce total harmonic distortion (THD), and improve efficiency. Finally, this paper discusses expectations for future research and development in the photovoltaic industry.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Innovative approaches for minimizing leakage current in three-phase transformerless PV inverters

Wang

2024

J. Phys.: Conf. Ser.

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“…Various DC-DC converters, such as interleaved converters, have been presented in the literature during the last few years to solve these issue [9], [10]. Soft-switching converters [11], [12] coupled-inductor structures [13], [14] and voltage multiplier converters [15], [16]. However, these structures are still in the development phase for answering the tough requirements.…”

Section: Introductionmentioning

confidence: 99%

Effect of switched-capacitor on super-lift Luo converter

Hussein¹,

Motlak

Almusawi³

2022

Bulletin EEI

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With the increasing need for solar energy and the need for DC-DC converters that are more efficient, smaller in size, less expensive, and faster in response, in this paper, we will modify the positive output super-lift Luo converter using a switched-capacitor cell. It consists of two capacitors that are charged in parallel and discharged in series to raise the output voltage, the use of capacitors in-stead of inductors increases the voltage, because capacitors are more efficient and have a smaller size than inductors and provide faster and smoother charging and discharging than inductors, so a capacitive cell has been used. The circuit was simulated using the physical security information management (PSIM) program. The current, voltage, and gain co-efficient waves were analyzed and the theoretical equations were proven. The circuit was also linked with the maximum power point tracker using the same program with a solar cell to get the most benefit from the solar energy using this type of converter.

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“…Also, the high efficiency is another critical concern in these converters. Over the past several years, various DC‐DC converters have been introduced in the literature to overcome these challenges, for example, interleaved converters, 8–10 soft switching converters, 11–13 coupled inductor structures, 14–16 and voltage multiplier converters 17–19 . However, these structures are still in the development phase for answering the tough requirements.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of a switched‐capacitor DC‐DC converter with variable conversion ratio

Kurdkandi

Farhadi

Babaei

et al. 2020

Circuit Theory & Apps

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In order to increase the low voltage of renewable energy systems to a relatively high bus voltage for the downstream DC-AC grid-connected inverter, a new DC-DC switched-capacitor converter with the potential of output voltage regulation is proposed. The operational principles, with regard to the specific switching conditions, are provided the relationships for the parameter design and efficiency calculation. The topology makes it possible to integrate the high voltage gain and excellent output regulation that open a huge area of applications and create the possibility of maximum power point tracking (MPPT), which is an important advantage of proposed structure. Moreover, the most important advantages of the proposed structure are continuous input current, variety of the DC voltage source values, and the cost of the converter in comparison with the conventional structures. A comparison with other similar structures is given to show the merits of the proposed topology. Finally, the experimental results are presented to clarify the theory and feasibility of the proposed converter. K E Y W O R D S DC-DC power conversion, high step-up voltage gain, switched capacitor (SC)

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Filter-Clamped Two-Level Three-Phase Transformerless Grid-Connected Photovoltaic Inverter for Leakage Current Reduction

Cited by 17 publications

References 43 publications

Innovative approaches for minimizing leakage current in three-phase transformerless PV inverters

Innovative approaches for minimizing leakage current in three-phase transformerless PV inverters

Effect of switched-capacitor on super-lift Luo converter

Design and analysis of a switched‐capacitor DC‐DC converter with variable conversion ratio

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