NDLI: Low-leakage current two-stage transformerless grid-connected converter for residential PV application

Content Provider	IET Digital Library
Author	Farswan, Rajesh S. Datta, Abhijit
Abstract	Conventional PV-fed three-level DC–DC converter has greater leakage current due to varying common mode (CM) voltage, and thus requires galvanic isolation if interfaced with on-grid inverters. To reduce the leakage current and eliminate the requirement of galvanic isolation, a low-leakage three-level DC–DC converter is proposed for residential application. Efficacy of the converter is demonstrated by proposing a two-stage single-phase on-grid PV system by interfacing with a three-level transformerless single-phase inverter topology. The DC–DC converter has reduced leakage current, which decreases the overall leakage current in the PV inverter system. In addition, smaller filter magnetics are required for both the three-level converter and three-level inverter. The CM analysis of the proposed system is presented. The proposed system is simulated using PSCAD and a laboratory prototype is developed for experimental evaluation. The experimental results show a part-load efficiency of >96% for the overall system. Furthermore, the measured leakage current in the proposed system is <10 mA, which is below the prescribed RMS limit, as specified in German DIN VDE 0126-1-1 standard.
Starting Page	1043
Ending Page	1052
Page Count	10
ISSN	17554535
Volume Number	12
e-ISSN	17554543
Issue Number	Issue 5, May (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/12/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2018.5363
Journal	IET Power Electronics
Publisher Date	2019-01-08
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Common Mode Voltage Control of Electric Power System Conventional PV-fed Three-level DC–DC Converter Current 10.0 MA DC-DC Power Converter Galvanic Isolation Greater Leakage Current Invertors Leakage Current Low-leakage Measured Leakage Current On-grid Inverter On-grid PV System Photovoltaic Power System Power Converter Power Electronics Power Grid Power Supplies to Apparatus Power Supply PV Inverter System Residential Application Residential PV Application Single-phase Inverter Topology Solar Power Stations Supervisory Circuit Three-level Converter Three-level Inverter Two-stage Single-phase Two-stage Transformerless Grid-connected Converter
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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