Research on the Control of Unidirectional Power Flow DC Transformer for Photovoltaic DC High-Voltage Convergence Based on Soft Switching

被引:0
作者
Yao, Yue [1 ]
Chen, Jieguang [1 ]
Xu, Weiming [1 ]
He, Ping [1 ]
Chen, Yaojun [2 ]
Li, Jiaying [2 ]
机构
[1] Hengchuang Elect Power Design & Res Inst Co Ltd, Technol Dept, Jiaxin, Peoples R China
[2] Wuhan Univ, Sch Elect & Automat, Wuhan, Peoples R China
来源
2023 5TH ASIA ENERGY AND ELECTRICAL ENGINEERING SYMPOSIUM, AEEES | 2023年
关键词
unidirectional power flow; dc transformer; LLC converter; voltage gain; control; SOLID-STATE TRANSFORMER; DESIGN;
D O I
10.1109/AEEES56888.2023.10114088
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
In the centralized photovoltaic grid-connected applications, the high-power unidirectional power flow DC transformer is the key equipment to realize the convergence of DC high-voltage. This paper proposes a DC transformer topology with multi-module whose outputs connected in series, and each module connected with an independent PV battery pack. A single module consists of a boost converter and a LLC resonant converter. The boost converter is used to realize the MPPT of the input photovoltaic battery pack, while LLC resonant converter is used to realizes voltage and power conversion and isolation. IN the paper the soft switching conditions of LLC converter is studied, and the relationship curve between voltage gain and frequency is obtained. On this basis, based on the premise of realizing soft switching, a sub-module LLC transformer control strategy based on the voltage gain-frequency characteristic curve is proposed. Finally, the validity of the proposed strategy is verified by simulation and experiments, and the fault ride through characteristics
引用
收藏
页码:18 / 23
页数:6
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