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

fYear

2014

fDate

Aug. 31 2014-Sept. 3 2014

Firstpage

1

Lastpage

6

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Transportation Electrification Asia-Pacific (ITEC Asia-Pacific), 2014 IEEE Conference and Expo

Conference_Location

Beijing

Print_ISBN

978-1-4799-4240-4

Type

conf

DOI

10.1109/ITEC-AP.2014.6941090

Filename

6941090