NDLI: Highly efficient and reliable inverter concept-based transformerless photovoltaic inverters with tri-direction clamping cell for leakage current elimination

Content Provider	IET Digital Library
Author	Mei, Ye Hu, Senjun Lin, Lei Li, Wuhua He, Xiangning Cao, Fengwen
Abstract	Single-phase transformerless inverters are widely employed in grid-connected photovoltaic systems, because they are light, inexpensive and most importantly, have high conversion efficiencies. The highly efficient and reliable inverter concept (HERIC) is a well-known topology for transformerless inverters. Theses inverters, however, suffer from high-frequency leakage current generated by parasitic parameters. The mechanism behind the leakage current is described in this study. The concept of tri-direction clamping cell (TDCC) applied to HERIC-based transformerless inverters is proposed to eliminate the leakage current. This is achieved by clamping the freewheeling voltage to the midpoint voltage of the DC bus capacitors. A derived HERIC-based inverter has been selected to be connected with a TDCC that is constructed from three active switches in Y-type connection. This circuit is analysed in detail as an example in order to investigate the circuit performance. The experimental results show that the derived inverter has the advantages of leakage current elimination, high conversion efficiency and low grid current total harmonic distortion.
Starting Page	1675
Ending Page	1683
Page Count	9
ISSN	17554535
Volume Number	9
e-ISSN	17554543
Issue Number	Issue 8, Jun (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/9/8
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2015.0654
Journal	IET Power Electronics
Publisher Date	2016-06-29
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	DC Bus Capacitor Freewheeling Voltage Grid-connected Photovoltaic System HERIC-based Transformerless Photovoltaic Inverter High Conversion Efficiency Highly Efficient-and-reliable Inverter Concept Invertors Leakage Current Leakage Current Elimination Low Grid Current Total Harmonic Distortion Other Power Apparatus And Electric Machine Photovoltaic Power System Power Capacitor Power System Protection Solar Power Stations TDCC Tridirection Clamping Cell Y-type Connection
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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