NDLI: Quasi-resonant DC-link H5 PV inverter

Content Provider	IET Digital Library
Author	Fazlali, Behnam Adib, Ehsan
Abstract	By removing transformer from PV inverters, they become more attractive for distributed power generation systems. Regardless of their some extra leakage currents, transformer-less inverters would be more advantageous regarding their higher efficiency. However, using traditionally hard-switching converters still causes to drastic switching losses, high di/dt and electromagnetic interference. Quasi-resonant DC-link techniques have promising features to provide zero-voltage switching (ZVS) condition for full bridge inverters, but they are not suitable for transformer-less PV inverters due to consequent high leakage current. In this study, a transformer-less PV inverter is proposed by adapting a proper quasi-resonant DC-link technique to the H5 topology. Using only two auxiliary switches, ZVS turn on and turn off for high-frequency bus switch and ZCS turn on and ZVS turn off for high-frequency switches of the bridge as well as ZVS turn on and turn off of the antiparallel diodes of main switches are realised. Zero current switching (ZCS) turn on and ZVS turn off for auxiliary switches and ZVS turn on and ZCS turn off for antiparallel diodes are also provided. To verify the proposed circuit operation, a 20 kHz 1 kW quasi-resonant DC-link H5 PV inverter prototype is implemented and operation characteristics, soft switching conditions and design rules are confirmed.
Starting Page	1214
Ending Page	1222
Page Count	9
ISSN	17554535
Volume Number	10
e-ISSN	17554543
Issue Number	Issue 10, Aug (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/10/10
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2016.0970
Journal	IET Power Electronics
Publisher Date	2017-05-02
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Antiparallel Diode Auxiliary Switch Bridge Circuit Diode Distributed Power Generation Distributed Power Generation System Electromagnetic Interference Frequency 20 KHz Full Bridge Inverter H5 Topology Hard-switching Converter High-frequency Bus Switch Invertors Leakage Current Network Topology Power 1 KW Quasiresonant Dc-link H5 PV Inverter Soft Switching Condition Solar Cell And Array Switching Loss Transformer-less Inverter ZCS Zero Current Switching Zero Voltage Switching Zero-voltage Switching Condition ZVS
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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