Title :
A novel LLC integrated three-port DC-DC converter for stand-alone PV/battery system
Author :
Xiaofeng Sun ; Yanfeng Shen ; Wuying Li
Author_Institution :
Coll. of Electr. Eng., Yanshan Univ., Qinhuangdao, China
fDate :
Aug. 31 2014-Sept. 3 2014
Abstract :
By integrating an interleaved bidirectional Buck/Boost circuit and a full-bridge LLC resonant circuit, a three-port converter is proposed for stand-alone PV/Battery system. The full-bridge switching unit is shared, and system cost and size are reduced. All primary switches operate under ZVS and all secondary diodes can achieve ZCS-OFF, leading to reduced switching losses. In addition, the input current ripple is small, which is favorable for interfacing renewable energy sources. Both the operation principle and operation modes are presented. Then this paper analyzes the gain and soft switching characteristics. Finally, a 500W prototype is built and tested to verify all considerations.
Keywords :
DC-DC power convertors; battery storage plants; bridge circuits; photovoltaic power systems; power semiconductor diodes; zero current switching; LLC integrated three-port DC-DC converter; ZCS-OFF; full-bridge LLC resonant circuit; full-bridge switching unit; gain characteristics; input current ripple; interleaved bidirectional buck-boost circuit; power 500 W; renewable energy sources; secondary diodes; soft switching characteristics; stand-alone PV system; stand-alone battery system; switching loss reduction; system cost reduction; system size reduction; Batteries; Inductors; Magnetic resonance; Pulse width modulation; Switches; Switching frequency; Zero voltage switching;
Conference_Titel :
Transportation Electrification Asia-Pacific (ITEC Asia-Pacific), 2014 IEEE Conference and Expo
Conference_Location :
Beijing
Print_ISBN :
978-1-4799-4240-4
DOI :
10.1109/ITEC-AP.2014.6941090
