A Single-Stage Fault-Tolerant Three-Phase Bidirectional AC/DC Converter With Symmetric High-Frequency Y-Δ Connected Transformers

被引:13
|
作者
Gu, Ling [1 ]
Peng, Kai [1 ]
机构
[1] Nanjing Univ Sci & Technol, Sch Automat, Nanjing 210094, Peoples R China
基金
中国博士后科学基金;
关键词
AC-DC power converters; inverters; pulse width modulation converters; AC-DC CONVERTER; MODEL-PREDICTIVE CONTROL; RECTIFIER; DESIGN;
D O I
10.1109/TPEL.2020.2974992
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
This article presents a single-stage isolated three-phase bidirectional ac/dc converter with symmetric Y-Delta connected transformers, which implements ac/dc buck conversion, high-frequency electrical isolation, and high power factor for ac side (PF > 0.99). The converter can be utilized between the ac bus and the dc bus in ac-dc hybrid microgrid and in other applications where three-phase bidirectional ac/dc conversion is needed. With two operating modes available, the converter possesses the fault-tolerant ability and the improved light-load efficiency. When the converter works in the high power application with all the components operating normally, the transformers operate in the symmetric mode and share the power equally. Then, the switch current stress can be reduced. The converter can also operate in dual transformermode for light-load conditions or with some abnormal components. The Y-Delta connected transformers provide an additional step-down conversion ratio and make the converter suitable for buck conversion. Furthermore, to guarantee the voltage-second balance of the transformers, the corresponding space vector pulse width modulation (SVPWM) algorithm is proposed. Experimental results based on a 2.4-kW prototype are presented in detail, which verify the theoretical analysis and demonstrate the converter's performance well.
引用
收藏
页码:9226 / 9237
页数:12
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