Five-Level Common-Ground-Type Boosting Inverter With Lesser Capacitor-Stored Energy

Article Engineering, Electrical & Electronic

Dual Boost Five-Level Switched-Capacitor Inverter With Common Ground

Vishal Anand et al.

Summary: This paper presents a 5L-CGT inverter topology with double voltage boosting. The topology uses only eight switches and two capacitors which can be charged equal to the input source. The advantages of this topology include minimal common-mode voltage and leakage current. Capacitor selection and sizing are analyzed in detail, along with quasi-soft charging to minimize charging current ripples. The proposed 5L-CGT inverter is tested for inductive load under varying conditions, and a comparison with existing state-of-the-art shows its merits in terms of equal voltage stress and efficiency.

IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS (2023)

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Article Green & Sustainable Science & Technology

A new transformer-less common grounded five-level grid-tied inverter with leakage current elimination and voltage boosting capability for photovoltaic applications

Naser Vosoughi Kurdkandi et al.

Summary: Due to concerns about air pollution, global warming, and the limitations of fossil fuels, renewable energy sources such as photovoltaic applications are being widely integrated into power generation systems worldwide. This study proposes a new switched-capacitor-based transformer-less grid-tied inverter, which utilizes a series-parallel switching technique to achieve voltage boosting capability and implements a common ground technique for high overall efficiency and leakage current elimination. The inverter provides multi-level output voltage, reducing total harmonic distortion of the injected grid current, and incorporates a control strategy for controlling both active and reactive powers. A laboratory prototype of the proposed inverter is assembled and experimental results are analyzed to evaluate its performance.

IET RENEWABLE POWER GENERATION (2023)

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Review Green & Sustainable Science & Technology

A topology review and comparative analysis on transformerless grid-connected photovoltaic inverters and leakage current reduction techniques

Sahaya A. Ponrekha et al.

Summary: This paper extensively discusses the categorization of transformerless inverters and techniques to reduce leakage current, and compares their performance and construction. By simulating the inverters under different operating conditions and analyzing the loss contribution of each switch, it provides a deep intuition for designing efficient topologies to new researchers, designers, and engineers.

IET RENEWABLE POWER GENERATION (2022)

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Article Automation & Control Systems

A Common Grounded Type Dual-Mode Five-Level Transformerless Inverter for Photovoltaic Applications

Md Noman Habib Khan et al.

Summary: This article presents a novel dual-mode five-level common grounded transformerless inverter topology for a medium-power application with a wide input voltage range. The inverter consists of nine semiconductor switches, two inner flying-capacitors, and a small LC filter, showing high efficiency in laboratory tests.

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS (2021)

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Article Engineering, Multidisciplinary

A Five-Level Transformer-Less Inverter With Self-Voltage Balancing and Boosting Ability

Sangeeta Kumari et al.

Summary: A switched capacitor-based five-level inverter is proposed in this article, which can eliminate leakage current, boost output voltage, and simplify the control scheme. Experimental results verify the feasibility and performance advantages of the inverter.

IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS (2021)

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Article Engineering, Electrical & Electronic

A Novel Dual-Mode Switched-Capacitor Five-Level Inverter With Common-Ground Transformerless Concept

Reza Barzegarkhoo et al.

Summary: The article introduces a novel dual-mode switched-capacitor five-level-TL inverter with a common-ground feature for grid connection, which is capable of generating five output voltage levels in different operating modes and ensuring self-voltage balancing operation. It employs a simple dead-beat continuous current controller modulation technique to handle power exchange and maintain a fixed switching frequency operation. Experimental results demonstrate the feasibility of the proposed solution for practical applications.

IEEE TRANSACTIONS ON POWER ELECTRONICS (2021)

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Article Automation & Control Systems

Six-Switch Step-Up Common-Grounded Five-Level Inverter With Switched-Capacitor Cell for Transformerless Grid-Tied PV Applications

Reza Barzegarkhoo et al.

Summary: This article introduces a novel circuit configuration for photovoltaic string inverters, which aims to address the shortcomings of conventional topologies and enhance the output voltage levels. The proposed structure is based on a series-parallel switching conversion, resulting in improved voltage boosting and elimination of leakage current.

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS (2021)

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Review Engineering, Electrical & Electronic

Voltage Source Multilevel Inverters With Reduced Device Count: Topological Review and Novel Comparative Factors

Ahmed Salem et al.

Summary: This article aims to update and summarize the recently developed multilevel topologies with a reduced component count, and propose a comparative method with novel factors to take component ratings into account. The study covers single-phase and three-phase topologies with symmetrical and asymmetrical operations.

IEEE TRANSACTIONS ON POWER ELECTRONICS (2021)

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Article Engineering, Electrical & Electronic

A Novel Generalized Common-Ground Switched-Capacitor Multilevel Inverter Suitable for Transformerless Grid-Connected Applications

Reza Barzegarkhoo et al.

Summary: This study introduces a generalized circuit configuration of CGSC-TL inverters capable of higher voltage gain and output voltage levels generation, while maintaining the traits of existing inverters. Simulation and experimental results validate the effectiveness and feasibility of this proposal.

IEEE TRANSACTIONS ON POWER ELECTRONICS (2021)

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Article Engineering, Electrical & Electronic

Multilevel common-ground inverter with voltage boosting for PV applications

Sangeeta Kumari et al.

Summary: The paper introduces a five-level transformer-less inverter topology for PV applications, which helps to boost voltage, eliminate leakage current, and reduce component count.

IET POWER ELECTRONICS (2021)

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Article Engineering, Electrical & Electronic