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

doi:10.19595/j.cnki.1000-6753.tces.L80480

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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.

Key words： Three-phase four-leg unbalanced grid conditions high frequency link rectifier de-re-coupling saddle pulse width modulation inductor voltage

Received: 30 June 2018 Published: 28 June 2019

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TM461

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	Yan Zhaoyang
	Liang Chenyang
	Kang Ming
	Li Jianxia
	Yang Lijun

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Yan Zhaoyang,Liang Chenyang,Kang Ming等. Three-Phase Four-Leg High Frequency Link Matrix Rectifier and Its De-Re-Coupling SAPWM Method under Unbalanced Grid Conditions[J]. Transactions of China Electrotechnical Society, 2019, 34(12): 2558-2571.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L80480 OR https://dgjsxb.ces-transaction.com/EN/Y2019/V34/I12/2558

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