NDLI: Evaluation and analysis of transformerless photovoltaic inverter topology for efficiency improvement and reduction of leakage current

Content Provider	IET Digital Library
Author	Cha, Woo Jun Kim, Kyu Tae Cho, Yong Won Lee, Sung Ho Kwon, Bong Hwan
Abstract	In transfomerless photovoltaic (PV) grid-connected inverter application, to reduce leakage current and to increase efficiency, many inverter topologies have been proposed. The method for increasing efficiency and reducing leakage current is evaluated and analysed in the present study. The operation of transfomerless PV inverter topologies with high-performance such as full-bridge, H5, H6, HERIC and paralleled-buck topology is analysed to calculate switching losses, conduction losses and free-wheeling losses. Device total losses for inverter topology are calculated according to the switching frequency and the output power. Also, a novel high-frequency model of inverter topology is proposed using the leg voltage and high-frequency equivalent circuit. The relation between the parasitic capacitor voltage and its leakage current is explained using the proposed high-frequency model. Also, the magnitude of the high-frequency voltage in the parasitic capacitor is derived mathematically. Efficiency of the several inverter topology according to the output power is compared and the leakage current is analysed using a novel high-frequency model. Finally, the efficiency and leakage current analysis are verified by simulation tool and 3 kW prototype.
Starting Page	255
Ending Page	267
Page Count	13
ISSN	17554535
Volume Number	8
e-ISSN	17554543
Issue Number	Issue 2, Feb (2015)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/8/2
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2014.0401
Journal	IET Power Electronics
Publisher Date	2014-10-31
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Conduction Loss Efficiency Improvement Equivalent Circuit Free-wheeling Loss High-frequency Equivalent Circuit High-frequency Model Invertors Leakage Current Leakage Current Reduction Leg Voltage Network Topology Paralleled-buck Topology Parasitic Capacitor Voltage Power 3 KW Switching Loss Transfomerless PV Inverter Topology Transformerless Photovoltaic Inverter Topology
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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