A Safety Enhanced, High Step-Up DC-DC Converter for AC Photovoltaic Module Application

被引:122
作者
Chen, Shih-Ming [1 ]
Liang, Tsorng-Juu [1 ]
Yang, Lung-Sheng [2 ]
Chen, Jiann-Fuh [1 ]
机构
[1] Natl Cheng Kung Univ, Dept Elect Engn, GEERC, Tainan 70101, Taiwan
[2] Far E Univ, Dept Elect Engn, Tainan, Taiwan
关键词
AC module; coupled inductor; high step-up voltage gain; single switch; BOOST CONVERTER; HIGH-EFFICIENCY; INVERTER; DESIGN; SWITCH; INPUT;
D O I
10.1109/TPEL.2011.2170097
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
Within the photovoltaic (PV) power-generation market, the ac PV module has shown obvious growth. However, a high voltage gain converter is essential for the module's grid connection through a dc-ac inverter. This paper proposes a converter that employs a floating active switch to isolate energy from the PV panel when the ac module is OFF; this particular design protects installers and users from electrical hazards. Without extreme duty ratios and the numerous turns-ratios of a coupled inductor, this converter achieves a high step-up voltage-conversion ratio; the leakage inductor energy of the coupled inductor is efficiently recycled to the load. These features explain the module's high-efficiency performance. The detailed operating principles and steady-state analyses of continuous, discontinuous, and boundary conduction modes are described. A 15 V input voltage, 200 V output voltage, and 100 W output power prototype circuit of the proposed converter has been implemented; its maximum efficiency is up to 95.3% and full-load efficiency is 92.3%.
引用
收藏
页码:1809 / 1817
页数:9
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