Isolated Buck-Boost DC/DC Converter for PV Grid-Connected System

被引：0
|
作者：
Yao, Chuan [1 ]
Ruan, Xinbo [1 ]
Wang, Xuehua [1 ]
机构：
[1] Huazhong Univ Sci & Technol, Coll Elect & Elect Engn, Wuhan, Peoples R China
来源：
IEEE INTERNATIONAL SYMPOSIUM ON INDUSTRIAL ELECTRONICS (ISIE 2010) | 2010年
关键词：
Isolated Buck-Boost converter; Inductor current ripple; Two-edge modulation; Control strategy; GENERATION; TOPOLOGIES; INVERTERS;
D O I：
暂无
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：
A family isolated Buck-Boost converter is proposed in this paper, and FB-Boost converter is analyzed as one of the typical topologies. An improved two-edge modulation strategy is proposed to minimize the inductor current ripple over the input voltage range. In order to improve the efficiency and reliability of FB-Boost converter, three-mode control scheme is proposed in this paper, according to the different region of input voltage, FB-Boost converter can operate at Boost, FB-Boost and FB modes respectively. As the input voltage in FB-Boost mode is close to the output voltage, the inductor current ripple in this mode is smaller than the other modes, so the switching frequency in this mode can be lowered to reduce the switching loss. To verify the effectiveness of the design and control, a 250 V similar to 500 V input, 360 V output and 6 kW rated power prototype is fabricated, the average efficiency over the input voltage range is 95.6%, and the highest efficiency can achieve 96.7%.
引用
收藏
页码：889 / 894
页数：6
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