Three-Phase Four-Leg High Frequency Link Matrix Rectifier and Its De-Re-Coupling SAPWM Method under Unbalanced Grid Conditions
Yan Zhaoyang, Liang Chenyang, Kang Ming, Li Jianxia, Yang Lijun
Key Lab of Power Electronics for Energy Conversion and Motor Drive of Hebei Province School of Electrical Engineering Yanshan University Qinhuangdao 066004 China
Abstract：In order to improve the applicability of the three-phase high frequency link matrix rectifier under the unbalanced gird conditions, a three-phase four-leg high frequency link matrix rectifier topology is proposed. This topology introduces a fourth leg based on a voltage-type three-phase three-leg high frequency link matrix rectifier, which is designed to provide a zero-sequence current path for the input unbalanced current, thereby improving its ability to adapt to unbalanced grid conditions. In order to improve the utilization of DC voltage and reduce the input current harmonics, a digital implementation of a de-re-coupling saddle pulse width modulation (SAPWM) method for bidirectional switches is proposed, and the algorithm is simple and flexible. A new idea is proposed for analyzing the voltage waveforms at both ends of the filter inductor on the AC side, to demonstrate that the proposed topology can be decomposed into three independent single-phase high-frequency link matrix rectifiers. Finally, a stable DC voltage can still be output under the condition of one-phase drop of the grid voltage, the input current harmonic content is low and the power factor is high. Simulation and experiments verify the feasibility and effectiveness of the proposed topology and theoretical analysis.
闫朝阳, 梁晨阳, 康鸣, 李建霞, 杨丽君. 不平衡电网下三相四桥臂高频链矩阵整流器及其解结耦鞍型波脉宽调制方法[J]. 电工技术学报, 2019, 34(12): 2558-2571.
Yan Zhaoyang, Liang Chenyang, Kang Ming, Li Jianxia, Yang Lijun. Three-Phase Four-Leg High Frequency Link Matrix Rectifier and Its De-Re-Coupling SAPWM Method under Unbalanced Grid Conditions. Transactions of China Electrotechnical Society, 2019, 34(12): 2558-2571.
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2019, Vol. 34 
