Ground Leakage Current Reduction in Single-Phase Grid-Connected Power Converter

Mohammadhassan Hedayati; Vinod John

doi:10.1109/OPTIM.2015.7427014

Ground Leakage Current Reduction in Single-Phase Grid-Connected Power Converter

Mohammadhassan Hedayati, Vinod John

Engineering

Indian Institute of Science Bangalore

Research output: Chapter in Book/Report/Conference proceeding › Published conference contribution

2 Citations (Scopus)

Abstract

One of the major concerns during the design of grid-connected converters is meeting the electromagnetic interference (EMI) standards. Ground leakage current is another aspect which has a stringent limit due to safety concerns. Presence of high frequency pulses, with high dv/dt due to switching actions, in common-mode (CM) voltage excite parasitic capacitances of the power converters. This results in injection of peaky current to ground and causes high EMI noise level. In this paper a new method is proposed to make the CM voltage, of a single-phase grid-connected converter, sinusoidal and free of high frequency pulses. The proposed method consists of two parallel connected H-bridge power converters, which uses unipolar PWM with carrier interleaving angle of 180°. The proposed method reduces the ground leakage current by more than an order of magnitude. A modification to the LCL filter is adopted which further reduces the leakage current by 48%. It is shown that these modifications make the overall system insensitive to circuit nonidealities. Experimental results based on ground leakage current and EMI measurements on a 7.5kW parallel single-phase PWM-rectifier are presented. These results validate the effectiveness of the proposed method.

Original language	English
Title of host publication	2015 Intl. Aegean Conference on Electrical Machines & Power Electronics (ACEMP 2015), 2015 Intl. Conference on Optimization of Electrical & Electronic Equipment (OPTIM2015) & 2015 Intl. Symposium on Advanced Electromechanical Motion Systems (ELECTROMOTION 2015) 2-4 Sept. 2015
Publisher	IEEE Explore
Pages	117-112
Number of pages	6
ISBN (Electronic)	978-1-4673-7239-8, 978-1-4673-7547-4 (USB)
DOIs	https://doi.org/10.1109/OPTIM.2015.7427014
Publication status	Published - 2015
Event	2015 Intl Aegean Conference on Electrical Machines & Power Electronics (ACEMP 2015) - Side, Turkey Duration: 2 Sept 2015 → 4 Sept 2015 Conference number: ACEMP 2015 https://www.proceedings.com/content/029/029710webtoc.pdf

Conference

Conference	2015 Intl Aegean Conference on Electrical Machines & Power Electronics (ACEMP 2015)
Country/Territory	Turkey
City	Side
Period	2/09/15 → 4/09/15
Internet address	https://www.proceedings.com/content/029/029710webtoc.pdf

Bibliographical note

We would like to thank the Department of Heavy Industry (DHI) Government of India for funding this project and supporting us throughout the work.

Keywords

AC-DC power conversion
electromagnetic compatibility
leakage currents

Access to Document

10.1109/OPTIM.2015.7427014Licence: Unspecified

Cite this

Hedayati, M., & John, V. (2015). Ground Leakage Current Reduction in Single-Phase Grid-Connected Power Converter. In 2015 Intl. Aegean Conference on Electrical Machines & Power Electronics (ACEMP 2015), 2015 Intl. Conference on Optimization of Electrical & Electronic Equipment (OPTIM2015) & 2015 Intl. Symposium on Advanced Electromechanical Motion Systems (ELECTROMOTION 2015) 2-4 Sept. 2015 (pp. 117-112). IEEE Explore. https://doi.org/10.1109/OPTIM.2015.7427014

Ground Leakage Current Reduction in Single-Phase Grid-Connected Power Converter. / Hedayati, Mohammadhassan; John, Vinod.
2015 Intl. Aegean Conference on Electrical Machines & Power Electronics (ACEMP 2015), 2015 Intl. Conference on Optimization of Electrical & Electronic Equipment (OPTIM2015) & 2015 Intl. Symposium on Advanced Electromechanical Motion Systems (ELECTROMOTION 2015) 2-4 Sept. 2015. IEEE Explore, 2015. p. 117-112.

Research output: Chapter in Book/Report/Conference proceeding › Published conference contribution

Hedayati, M & John, V 2015, Ground Leakage Current Reduction in Single-Phase Grid-Connected Power Converter. in 2015 Intl. Aegean Conference on Electrical Machines & Power Electronics (ACEMP 2015), 2015 Intl. Conference on Optimization of Electrical & Electronic Equipment (OPTIM2015) & 2015 Intl. Symposium on Advanced Electromechanical Motion Systems (ELECTROMOTION 2015) 2-4 Sept. 2015. IEEE Explore, pp. 117-112, 2015 Intl Aegean Conference on Electrical
Machines & Power Electronics
(ACEMP 2015), Side, Turkey, 2/09/15. https://doi.org/10.1109/OPTIM.2015.7427014

Hedayati M, John V. Ground Leakage Current Reduction in Single-Phase Grid-Connected Power Converter. In 2015 Intl. Aegean Conference on Electrical Machines & Power Electronics (ACEMP 2015), 2015 Intl. Conference on Optimization of Electrical & Electronic Equipment (OPTIM2015) & 2015 Intl. Symposium on Advanced Electromechanical Motion Systems (ELECTROMOTION 2015) 2-4 Sept. 2015. IEEE Explore. 2015. p. 117-112 doi: 10.1109/OPTIM.2015.7427014

Hedayati, Mohammadhassan ; John, Vinod. / Ground Leakage Current Reduction in Single-Phase Grid-Connected Power Converter. 2015 Intl. Aegean Conference on Electrical Machines & Power Electronics (ACEMP 2015), 2015 Intl. Conference on Optimization of Electrical & Electronic Equipment (OPTIM2015) & 2015 Intl. Symposium on Advanced Electromechanical Motion Systems (ELECTROMOTION 2015) 2-4 Sept. 2015. IEEE Explore, 2015. pp. 117-112

@inproceedings{4d91f2fb48f44e3fb5ef773786f6256a,

title = "Ground Leakage Current Reduction in Single-Phase Grid-Connected Power Converter",

abstract = "One of the major concerns during the design of grid-connected converters is meeting the electromagnetic interference (EMI) standards. Ground leakage current is another aspect which has a stringent limit due to safety concerns. Presence of high frequency pulses, with high dv/dt due to switching actions, in common-mode (CM) voltage excite parasitic capacitances of the power converters. This results in injection of peaky current to ground and causes high EMI noise level. In this paper a new method is proposed to make the CM voltage, of a single-phase grid-connected converter, sinusoidal and free of high frequency pulses. The proposed method consists of two parallel connected H-bridge power converters, which uses unipolar PWM with carrier interleaving angle of 180°. The proposed method reduces the ground leakage current by more than an order of magnitude. A modification to the LCL filter is adopted which further reduces the leakage current by 48%. It is shown that these modifications make the overall system insensitive to circuit nonidealities. Experimental results based on ground leakage current and EMI measurements on a 7.5kW parallel single-phase PWM-rectifier are presented. These results validate the effectiveness of the proposed method.",

keywords = "AC-DC power conversion, electromagnetic compatibility, leakage currents",

author = "Mohammadhassan Hedayati and Vinod John",

note = "We would like to thank the Department of Heavy Industry (DHI) Government of India for funding this project and supporting us throughout the work.; 2015 Intl Aegean Conference on Electrical<br/>Machines & Power Electronics<br/>(ACEMP 2015) ; Conference date: 02-09-2015 Through 04-09-2015",

year = "2015",

doi = "10.1109/OPTIM.2015.7427014",

language = "English",

pages = "117--112",

booktitle = "2015 Intl. Aegean Conference on Electrical Machines & Power Electronics (ACEMP 2015), 2015 Intl. Conference on Optimization of Electrical & Electronic Equipment (OPTIM2015) & 2015 Intl. Symposium on Advanced Electromechanical Motion Systems (ELECTROMOTION 2015) 2-4 Sept. 2015",

publisher = "IEEE Explore",

url = "https://www.proceedings.com/content/029/029710webtoc.pdf",

}

TY - GEN

T1 - Ground Leakage Current Reduction in Single-Phase Grid-Connected Power Converter

AU - Hedayati, Mohammadhassan

AU - John, Vinod

N1 - Conference code: ACEMP 2015

PY - 2015

Y1 - 2015

N2 - One of the major concerns during the design of grid-connected converters is meeting the electromagnetic interference (EMI) standards. Ground leakage current is another aspect which has a stringent limit due to safety concerns. Presence of high frequency pulses, with high dv/dt due to switching actions, in common-mode (CM) voltage excite parasitic capacitances of the power converters. This results in injection of peaky current to ground and causes high EMI noise level. In this paper a new method is proposed to make the CM voltage, of a single-phase grid-connected converter, sinusoidal and free of high frequency pulses. The proposed method consists of two parallel connected H-bridge power converters, which uses unipolar PWM with carrier interleaving angle of 180°. The proposed method reduces the ground leakage current by more than an order of magnitude. A modification to the LCL filter is adopted which further reduces the leakage current by 48%. It is shown that these modifications make the overall system insensitive to circuit nonidealities. Experimental results based on ground leakage current and EMI measurements on a 7.5kW parallel single-phase PWM-rectifier are presented. These results validate the effectiveness of the proposed method.

AB - One of the major concerns during the design of grid-connected converters is meeting the electromagnetic interference (EMI) standards. Ground leakage current is another aspect which has a stringent limit due to safety concerns. Presence of high frequency pulses, with high dv/dt due to switching actions, in common-mode (CM) voltage excite parasitic capacitances of the power converters. This results in injection of peaky current to ground and causes high EMI noise level. In this paper a new method is proposed to make the CM voltage, of a single-phase grid-connected converter, sinusoidal and free of high frequency pulses. The proposed method consists of two parallel connected H-bridge power converters, which uses unipolar PWM with carrier interleaving angle of 180°. The proposed method reduces the ground leakage current by more than an order of magnitude. A modification to the LCL filter is adopted which further reduces the leakage current by 48%. It is shown that these modifications make the overall system insensitive to circuit nonidealities. Experimental results based on ground leakage current and EMI measurements on a 7.5kW parallel single-phase PWM-rectifier are presented. These results validate the effectiveness of the proposed method.

KW - AC-DC power conversion

KW - electromagnetic compatibility

KW - leakage currents

U2 - 10.1109/OPTIM.2015.7427014

DO - 10.1109/OPTIM.2015.7427014

M3 - Published conference contribution

SP - 117

EP - 112

BT - 2015 Intl. Aegean Conference on Electrical Machines & Power Electronics (ACEMP 2015), 2015 Intl. Conference on Optimization of Electrical & Electronic Equipment (OPTIM2015) & 2015 Intl. Symposium on Advanced Electromechanical Motion Systems (ELECTROMOTION 2015) 2-4 Sept. 2015

PB - IEEE Explore

T2 - 2015 Intl Aegean Conference on Electrical<br/>Machines & Power Electronics<br/>(ACEMP 2015)

Y2 - 2 September 2015 through 4 September 2015

ER -

Ground Leakage Current Reduction in Single-Phase Grid-Connected Power Converter

Abstract

Conference

Bibliographical note

Keywords

Access to Document

Fingerprint

Cite this