NDLI: EMI and ground leakage current reduction in single-phase grid-connected power converter

Content Provider	IET Digital Library
Author	Hedayati, Mohammad Hassan John, Vinod
Abstract	Ground leakage current in a power converter is a major concern, which has stringent limitations due to safety concerns. Presence of high-frequency pulses, with high dv/dt due to switching actions in common-mode (CM) voltage, result in injection of current waveforms with large di/dt spikes into the ground and causes high electromagnetic interference (EMI) noise level. In this study, a new method is proposed to make the CM voltage, of a single-phase grid-connected inverter, sinusoidal and free of high-frequency pulses. The proposed method consists of two parallel connected H-bridge power converters, which uses unipolar pulse width modulation (PWM) with carrier interleaving angle of 180°. The proposed method reduces the ground leakage current by more than an order of magnitude. A novel modification to the LCL filter is proposed which further reduces the leakage current by 48%. It is shown that these modifications make the overall system insensitive to circuit non-idealities. Experimental results based on ground leakage current measurements on a 7.5 kW parallel single-phase PWM rectifier are presented. These results validate the effectiveness of the proposed method.
Starting Page	938
Ending Page	944
Page Count	7
ISSN	17554535
Volume Number	10
e-ISSN	17554543
Issue Number	Issue 8, Jun (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/10/8
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2016.0568
Journal	IET Power Electronics
Publisher Date	2017-03-06
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Carrier Interleaving Angle CM Voltage Common-mode Voltage Electromagnetic Compatibility Electromagnetic Interference Electromagnetic Interference Noise Level EMI Ground Leakage Current Reduction Interference Invertors LCL Filter Leakage Current Other Power Apparatus And Electric Machine Parallel Connected H-bridge Power Converter Parallel Single-phase PWM Rectifier Power 7.5 KW Power Converter Power Filter Power Grid PWM Rectifier Single-phase Grid-connected Inverter Single-phase Grid-connected Power Converter Unipolar Pulse Width Modulation
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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