DocumentCode :
2864586
Title :
High efficiency wide load range buck/boost/bridge photovoltaic microconverter
Author :
Hester, Richard K. ; Thornton, Christopher ; Dhople, Sairaj ; Zhao, Zheng ; Sridhar, Nagarajan ; Freeman, Dave
Author_Institution :
Texas Instrum., Dallas, TX, USA
fYear :
2011
fDate :
6-11 March 2011
Firstpage :
309
Lastpage :
313
Abstract :
Series strings of photovoltaic modules with integrated dc-dc microconverters can harvest more energy compared to conventional string-inverter architectures if the arrays are partially shaded or the modules mismatched. This work presents a multi-mode dc-dc converter as a candidate microconverter topology for photovoltaic modules. The topology constitutes a single inductor and four switching devices and can function in either buck, boost or an intermediate bridge mode based on the load. The proposed maximum power point tracking scheme is capable of tracking the true maximum even in partially-shaded PV modules. An experimental prototype demonstrates efficiency above 95 % at 215 W over a load range of 3 A to 7 A.
Keywords :
DC-DC power convertors; photovoltaic power systems; current 3 A to 7 A; high efficiency wide load range boost photovoltaic microconverter; high efficiency wide load range bridge photovoltaic microconverter; high efficiency wide load range buck photovoltaic microconverter; integrated dc-dc microconverters; microconverter topology; multimode dc-dc converter; partially-shaded PV modules; photovoltaic modules; power 215 W; string-inverter architectures; Bridge circuits; Converters; Photovoltaic systems; Prototypes; Pulse width modulation; Switches;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2011 Twenty-Sixth Annual IEEE
Conference_Location :
Fort Worth, TX
ISSN :
1048-2334
Print_ISBN :
978-1-4244-8084-5
Type :
conf
DOI :
10.1109/APEC.2011.5744613
Filename :
5744613
Link To Document :
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