Minimization of leakage ground current in transformerless single-phase full-bridge photovoltaic inverters

Dimitrios Zografos; Eftichios Koutroulis; Yongheng Yang; Frede Blaabjerg

doi:10.1109/EPE.2015.7309232

Minimization of leakage ground current in transformerless single-phase full-bridge photovoltaic inverters

Dimitrios Zografos, Eftichios Koutroulis, Yongheng Yang, Frede Blaabjerg

AAU Energy

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

9 Citations (Scopus)

Abstract

The market of PV systems is rapidly expanding during the last years and the transformerless DC/AC inverters are key components in this evolution. Despite its design and control simplicity, a transformerless full-bridge DC/AC inverter may exhibit a high leakage ground current, due to capacitive coupling between the solar panels and ground, which prohibits its employment in single-phase PV systems. Thus, multiple alternative transformerless PV inverter topologies have been developed in the past, which, however, comprise additional power devices and/or passive components. In this paper, a new modulation method is proposed for optimally controlling the power switches of transformerless single-phase full-bridge PV inverters, such that their leakage ground current is minimized. The design results demonstrate that by using the proposed technique, the leakage ground current of transformerless full-bridge inverters is reduced below the maximum limit imposed by the VDE 0126-1-1 standard, thus enabling their application in single-phase PV installations, instead of more complex PV inverter structures.

Original language	English
Title of host publication	Proceedings of the 2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe)
Number of pages	10
Publisher	IEEE Press
Publication date	Sept 2015
Pages	1-10
DOIs	https://doi.org/10.1109/EPE.2015.7309232
Publication status	Published - Sept 2015
Event	17th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2015 - Centre International de Conférence Genève (CICG), 17 rue Varembé CH . 1211 Genève 20, Geneva, Switzerland Duration: 8 Sept 2015 → 10 Sept 2015

Conference

Conference	17th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2015
Location	Centre International de Conférence Genève (CICG), 17 rue Varembé CH . 1211 Genève 20
Country/Territory	Switzerland
City	Geneva
Period	08/09/2015 → 10/09/2015

Keywords

Control systems
Inverters
Optimization
Power harmonic filters
Pulse width modulation
Topology
Genetic Algorithms
Pulse Width Modulation (PWM)
Single phase system
Voltage Source Inverters (VSI)

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Cite this

@inproceedings{016d94e8e8f740ce8a9c3437afb535f4,

title = "Minimization of leakage ground current in transformerless single-phase full-bridge photovoltaic inverters",

abstract = "The market of PV systems is rapidly expanding during the last years and the transformerless DC/AC inverters are key components in this evolution. Despite its design and control simplicity, a transformerless full-bridge DC/AC inverter may exhibit a high leakage ground current, due to capacitive coupling between the solar panels and ground, which prohibits its employment in single-phase PV systems. Thus, multiple alternative transformerless PV inverter topologies have been developed in the past, which, however, comprise additional power devices and/or passive components. In this paper, a new modulation method is proposed for optimally controlling the power switches of transformerless single-phase full-bridge PV inverters, such that their leakage ground current is minimized. The design results demonstrate that by using the proposed technique, the leakage ground current of transformerless full-bridge inverters is reduced below the maximum limit imposed by the VDE 0126-1-1 standard, thus enabling their application in single-phase PV installations, instead of more complex PV inverter structures.",

keywords = "Control systems, Inverters, Optimization, Power harmonic filters, Pulse width modulation, Topology, Genetic Algorithms, Pulse Width Modulation (PWM), Single phase system, Voltage Source Inverters (VSI)",

author = "Dimitrios Zografos and Eftichios Koutroulis and Yongheng Yang and Frede Blaabjerg",

year = "2015",

month = sep,

doi = "10.1109/EPE.2015.7309232",

language = "English",

pages = "1--10",

booktitle = "Proceedings of the 2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe)",

publisher = "IEEE Press",

note = "17th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2015, IEEE ECCE-EPE 2015 ; Conference date: 08-09-2015 Through 10-09-2015",

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Zografos, D, Koutroulis, E, Yang, Y & Blaabjerg, F 2015, Minimization of leakage ground current in transformerless single-phase full-bridge photovoltaic inverters. in Proceedings of the 2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe). IEEE Press, pp. 1-10, 17th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2015, Geneva, Switzerland, 08/09/2015. https://doi.org/10.1109/EPE.2015.7309232

Minimization of leakage ground current in transformerless single-phase full-bridge photovoltaic inverters. / Zografos, Dimitrios; Koutroulis, Eftichios; Yang, Yongheng et al.
Proceedings of the 2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe). IEEE Press, 2015. p. 1-10.

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

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T1 - Minimization of leakage ground current in transformerless single-phase full-bridge photovoltaic inverters

AU - Zografos, Dimitrios

AU - Koutroulis, Eftichios

AU - Yang, Yongheng

AU - Blaabjerg, Frede

PY - 2015/9

Y1 - 2015/9

N2 - The market of PV systems is rapidly expanding during the last years and the transformerless DC/AC inverters are key components in this evolution. Despite its design and control simplicity, a transformerless full-bridge DC/AC inverter may exhibit a high leakage ground current, due to capacitive coupling between the solar panels and ground, which prohibits its employment in single-phase PV systems. Thus, multiple alternative transformerless PV inverter topologies have been developed in the past, which, however, comprise additional power devices and/or passive components. In this paper, a new modulation method is proposed for optimally controlling the power switches of transformerless single-phase full-bridge PV inverters, such that their leakage ground current is minimized. The design results demonstrate that by using the proposed technique, the leakage ground current of transformerless full-bridge inverters is reduced below the maximum limit imposed by the VDE 0126-1-1 standard, thus enabling their application in single-phase PV installations, instead of more complex PV inverter structures.

AB - The market of PV systems is rapidly expanding during the last years and the transformerless DC/AC inverters are key components in this evolution. Despite its design and control simplicity, a transformerless full-bridge DC/AC inverter may exhibit a high leakage ground current, due to capacitive coupling between the solar panels and ground, which prohibits its employment in single-phase PV systems. Thus, multiple alternative transformerless PV inverter topologies have been developed in the past, which, however, comprise additional power devices and/or passive components. In this paper, a new modulation method is proposed for optimally controlling the power switches of transformerless single-phase full-bridge PV inverters, such that their leakage ground current is minimized. The design results demonstrate that by using the proposed technique, the leakage ground current of transformerless full-bridge inverters is reduced below the maximum limit imposed by the VDE 0126-1-1 standard, thus enabling their application in single-phase PV installations, instead of more complex PV inverter structures.

KW - Control systems

KW - Inverters

KW - Optimization

KW - Power harmonic filters

KW - Pulse width modulation

KW - Topology

KW - Genetic Algorithms

KW - Pulse Width Modulation (PWM)

KW - Single phase system

KW - Voltage Source Inverters (VSI)

U2 - 10.1109/EPE.2015.7309232

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M3 - Article in proceeding

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BT - Proceedings of the 2015 17th European Conference on Power Electronics and Applications (EPE'15 ECCE-Europe)

PB - IEEE Press

T2 - 17th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2015

Y2 - 8 September 2015 through 10 September 2015

ER -

Minimization of leakage ground current in transformerless single-phase full-bridge photovoltaic inverters

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