A Single Stage Doubly Grounded Transformerless Inverter Topology With Buck-Boost Voltage Capability for Grid Connected PV Systems

Chamarthi, Phanikumar; Moursi, Mohamed Shawky El; Khadkikar, Vinod; Hosani, Khalifa Al; Al‐Durra, Ahmed; EL-Fouly, Tarek H. M.

doi:10.1109/tpwrd.2022.3166506

Cited by 10 publications

(12 citation statements)

References 38 publications

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“…Therefore, compared to other proposed structures, the proposed topology is cost-effective. Compared other presented topologies in Table V except [17], [18], [37], [3] and [33], the proposed topology has the best value of the power density. Although the power density of the proposed topology is lower than topologies [17], [18], [37], [3] and [33], it nevertheless has a higher overall efficiency.…”

Section: Comparisonmentioning

confidence: 87%

“…Compared other presented topologies in Table V except [17], [18], [37], [3] and [33], the proposed topology has the best value of the power density. Although the power density of the proposed topology is lower than topologies [17], [18], [37], [3] and [33], it nevertheless has a higher overall efficiency. Although the power density of the proposed structure is less than structures [17], [18] and [29], but in comparison with these structures the proposed structure has the ability to eliminate the leakage current.…”

Section: Comparisonmentioning

confidence: 87%

“…Also, the proposed structure, unlike structures [18] and [19], can provide voltage boosting feature. Although the power density of the proposed topology is lower than that of structures [3] and [37], it nevertheless has a high efficiency. Also, unlike topology [37], the proposed topology can provide the voltage boosting capability.…”

Section: Comparisonmentioning

confidence: 90%

“…Although the power density of the proposed topology is lower than that of structures [3] and [37], it nevertheless has a high efficiency. Also, unlike topology [37], the proposed topology can provide the voltage boosting capability. (W/cm 3 ), voltage stress and current stress of utilized switches.…”

Section: Comparisonmentioning

confidence: 90%

“…The ripple voltage of switched capacitors can increase the harmonic distortion of output voltage waveform in the negative half cycle. Recently, some transformer-less common grounded grid-tied inverter to eliminate leakage current and provide voltage boosting feature during single stage power conversion [33][34][35][36][37][38]. Also, a new switched capacitor-based common grounded grid-tied five-level inverter has been presented in [39].…”

Section: Introductionmentioning

confidence: 99%

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A New Six-Level Transformer-Less Grid-Connected Solar Photovoltaic Inverter With Less Leakage Current

et al. 2022

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This paper presents a novel structure of the transformer-less grid-connected inverters. The proposed inverter is combined with six power switches and two power diodes which can generate six voltage levels at the output. Furthermore, the proposed inverter can overcome the leakage current issue in the photovoltaic (PV) system, which is the major problem in grid-tied PV applications. Additional significant features include-reduced filter size, lower total harmonic distortion (THD) of the injected current to the grid, and voltage boosting ability. Moreover, the proposed topology provides full reactive power support to the grid. A control strategy is designed and implemented to provide a voltage boost ability without using any additional dc-dc boost converter. Finally, the performance of the proposed inverter is validated by the 770 W laboratory prototype.INDEX TERMS Transformer-less inverter, voltage boosting ability, leakage current limitation, and photovoltaic application.

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Section: Comparisonmentioning

confidence: 87%

Section: Comparisonmentioning

confidence: 87%

Section: Comparisonmentioning

confidence: 90%

Section: Comparisonmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

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A New Six-Level Transformer-Less Grid-Connected Solar Photovoltaic Inverter With Less Leakage Current

et al. 2022

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An integrated common ground‐based grid‐connected current‐fed switched inverter

Ravitheja,

Sahoo,

Thirumala

2024

Circuit Theory & Apps

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A current‐fed switched inverter and its derivatives are gaining more attention in solar PV grid‐connected applications. In these inverters, the absence of galvanic isolation generates the leakage current, leading to the injection of harmonics and the degradation of solar PV panel life span. This paper proposes an integrated common ground‐based grid‐connected current‐fed switched inverter. The common ground between the input DC source and output AC grid eliminates the leakage current and makes the inverter immune to high‐frequency common‐mode voltage variations. It utilizes the shoot‐through state to boost the input DC voltage and obtain the rated AC output voltage. Moreover, as compared to the contemporary common ground‐based inverter topologies, the number of passive reactive elements and active switches is less. Thereby, the size, cost of the system, and associated power loss are reduced. The proposed inverter's continuous input current and buck–boost nature make it suitable for applications like solar PV systems. The steady‐state analysis of the proposed inverter is validated using the MATLAB Simulink tool, and furthermore, the simulation results during grid‐tied mode have been cross‐verified with the help of real‐time simulator OPAL‐RT. Further, the power loss and thermal loss analysis are carried out using the PLECS software. Finally, the performance of the inverter and simulation results are verified with the experimental results.

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