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

Mohammadhassan Hedayati, Vinod John

Research output: Chapter in Book/Report/Conference proceedingPublished conference contribution

2 Citations (Scopus)


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 languageEnglish
Title of host publication2015 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
PublisherIEEE Explore
Number of pages6
ISBN (Electronic)978-1-4673-7239-8, 978-1-4673-7547-4 (USB)
Publication statusPublished - 2015
Event2015 Intl Aegean Conference on Electrical
Machines & Power Electronics
(ACEMP 2015)
- Side, Turkey
Duration: 2 Sept 20154 Sept 2015
Conference number: ACEMP 2015


Conference2015 Intl Aegean Conference on Electrical
Machines & Power Electronics
(ACEMP 2015)
Internet address

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.


  • AC-DC power conversion
  • electromagnetic compatibility
  • leakage currents


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