A High-Voltage Gain Transformerless Grid-Connected Inverter

Yupeng Wei; Xiaoqiang Guo; Zhe Zhang; Lichong Wang; Josep M. Guerrero

doi:10.1109/SPIES55999.2022.10082633

A High-Voltage Gain Transformerless Grid-Connected Inverter

Yupeng Wei^*, Xiaoqiang Guo, Zhe Zhang, Lichong Wang, Josep M. Guerrero

^*Corresponding author for this work

Research output: Contribution to book/anthology/report/conference proceeding › Article in proceeding › Research › peer-review

Abstract

Transformerless inverters are used in small and medium power photovoltaic grid-connected systems due to small-size, low-cost and high-efficiency. Transformerless inverters have problems of leakage current and low-voltage gain in applications due to the lack of electrical isolation and boost characteristics of transformers. According to these problems, this paper introduces a gain unit circuit in the front-stage based on the two-stage topology of Boost converter combined with the H-bridge inverter to improve the boost capability. The rear-stage adopts double Buck inverter, which has the ability to prevent the short circuit of the bridge arms and improves the reliability of the system. At the same time, it is ensured that there is no high-frequency component in the parasitic capacitance voltage, and the leakage current is suppressed. In this paper, the operational modes, circuit gain and devices stress of the proposed inverter are analyzed, and the simulation verified the feasibility of the scheme.

Original language	English
Title of host publication	2022 4th International Conference on Smart Power and Internet Energy Systems, SPIES 2022
Number of pages	4
Publisher	IEEE
Publication date	2022
Pages	533-536
ISBN (Print)	978-1-6654-8956-0, 978-1-6654-8958-4
ISBN (Electronic)	978-1-6654-8957-7
DOIs	https://doi.org/10.1109/SPIES55999.2022.10082633
Publication status	Published - 2022
Event	4th International Conference on Smart Power and Internet Energy Systems, SPIES 2022 - Beijing, China Duration: 9 Dec 2022 → 12 Dec 2022

Conference

Conference	4th International Conference on Smart Power and Internet Energy Systems, SPIES 2022
Country/Territory	China
City	Beijing
Period	09/12/2022 → 12/12/2022
Sponsor	Shandong University, Tsinghua University

Bibliographical note

Funding Information:
This work was supported in part by National Natural Science Foundation of China under Grant 52077190, Central for Local Science and Technology Development Program under Grant 226Z4504G, and Hebei Province Natural Science Foundation under Grant F2020203013.

Publisher Copyright:
© 2022 IEEE.

Keywords

grid-connected inverter
high-voltage gain
leakage current
nonisolated inverter
two-stage converter

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10.1109/SPIES55999.2022.10082633

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Cite this

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title = "A High-Voltage Gain Transformerless Grid-Connected Inverter",

abstract = "Transformerless inverters are used in small and medium power photovoltaic grid-connected systems due to small-size, low-cost and high-efficiency. Transformerless inverters have problems of leakage current and low-voltage gain in applications due to the lack of electrical isolation and boost characteristics of transformers. According to these problems, this paper introduces a gain unit circuit in the front-stage based on the two-stage topology of Boost converter combined with the H-bridge inverter to improve the boost capability. The rear-stage adopts double Buck inverter, which has the ability to prevent the short circuit of the bridge arms and improves the reliability of the system. At the same time, it is ensured that there is no high-frequency component in the parasitic capacitance voltage, and the leakage current is suppressed. In this paper, the operational modes, circuit gain and devices stress of the proposed inverter are analyzed, and the simulation verified the feasibility of the scheme.",

keywords = "grid-connected inverter, high-voltage gain, leakage current, nonisolated inverter, two-stage converter",

author = "Yupeng Wei and Xiaoqiang Guo and Zhe Zhang and Lichong Wang and Guerrero, {Josep M.}",

note = "Funding Information: This work was supported in part by National Natural Science Foundation of China under Grant 52077190, Central for Local Science and Technology Development Program under Grant 226Z4504G, and Hebei Province Natural Science Foundation under Grant F2020203013. Publisher Copyright: {\textcopyright} 2022 IEEE.; 4th International Conference on Smart Power and Internet Energy Systems, SPIES 2022 ; Conference date: 09-12-2022 Through 12-12-2022",

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doi = "10.1109/SPIES55999.2022.10082633",

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Wei, Y, Guo, X, Zhang, Z, Wang, L & Guerrero, JM 2022, A High-Voltage Gain Transformerless Grid-Connected Inverter. in 2022 4th International Conference on Smart Power and Internet Energy Systems, SPIES 2022. IEEE, pp. 533-536, 4th International Conference on Smart Power and Internet Energy Systems, SPIES 2022, Beijing, China, 09/12/2022. https://doi.org/10.1109/SPIES55999.2022.10082633

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AU - Wei, Yupeng

AU - Guo, Xiaoqiang

AU - Zhang, Zhe

AU - Wang, Lichong

AU - Guerrero, Josep M.

N1 - Funding Information: This work was supported in part by National Natural Science Foundation of China under Grant 52077190, Central for Local Science and Technology Development Program under Grant 226Z4504G, and Hebei Province Natural Science Foundation under Grant F2020203013. Publisher Copyright: © 2022 IEEE.

PY - 2022

Y1 - 2022

N2 - Transformerless inverters are used in small and medium power photovoltaic grid-connected systems due to small-size, low-cost and high-efficiency. Transformerless inverters have problems of leakage current and low-voltage gain in applications due to the lack of electrical isolation and boost characteristics of transformers. According to these problems, this paper introduces a gain unit circuit in the front-stage based on the two-stage topology of Boost converter combined with the H-bridge inverter to improve the boost capability. The rear-stage adopts double Buck inverter, which has the ability to prevent the short circuit of the bridge arms and improves the reliability of the system. At the same time, it is ensured that there is no high-frequency component in the parasitic capacitance voltage, and the leakage current is suppressed. In this paper, the operational modes, circuit gain and devices stress of the proposed inverter are analyzed, and the simulation verified the feasibility of the scheme.

AB - Transformerless inverters are used in small and medium power photovoltaic grid-connected systems due to small-size, low-cost and high-efficiency. Transformerless inverters have problems of leakage current and low-voltage gain in applications due to the lack of electrical isolation and boost characteristics of transformers. According to these problems, this paper introduces a gain unit circuit in the front-stage based on the two-stage topology of Boost converter combined with the H-bridge inverter to improve the boost capability. The rear-stage adopts double Buck inverter, which has the ability to prevent the short circuit of the bridge arms and improves the reliability of the system. At the same time, it is ensured that there is no high-frequency component in the parasitic capacitance voltage, and the leakage current is suppressed. In this paper, the operational modes, circuit gain and devices stress of the proposed inverter are analyzed, and the simulation verified the feasibility of the scheme.

KW - grid-connected inverter

KW - high-voltage gain

KW - leakage current

KW - nonisolated inverter

KW - two-stage converter

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PB - IEEE

T2 - 4th International Conference on Smart Power and Internet Energy Systems, SPIES 2022

Y2 - 9 December 2022 through 12 December 2022

ER -

A High-Voltage Gain Transformerless Grid-Connected Inverter

Abstract

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Keywords

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