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 |
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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 | |
Publication status | Published - 2015 |
Event | 2015 Intl Aegean Conference on Electrical Machines & Power Electronics (ACEMP 2015) - Side, Turkey Duration: 2 Sep 2015 → 4 Sep 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) |
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Country/Territory | Turkey |
City | Side |
Period | 2/09/15 → 4/09/15 |
Internet address |
Keywords
- AC-DC power conversion
- electromagnetic compatibility
- leakage currents