Soft-switching Composite Modulation Strategy for Bidirectional Isolated AC-DC Matrix Converters

被引：0

作者：

Mei Y. ^{[1
]}

Lu Q. ^{[1
]}

Huang W. ^{[1
]}

机构：

[1] Inverter Technology Engineering Research Center, Beijing North China University of Technology University, Shijingshan Dsitrict, Beijing

来源：

Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2021年 / 41卷 / 07期

基金：

中国国家自然科学基金;

关键词：

AC-DC converter; Matrix converter; Phase-shift control; Zero voltage switch (ZVS);

D O I：

10.13334/j.0258-8013.pcsee.201406

中图分类号：

学科分类号：

摘要：

In this paper, a soft-switching composite modulation strategy of bidirectional isolated AC-DC matrix converters was proposed. In this modulation strategy, a symmetrical double-line-voltage modulation scheme was adopted for the front-stage three-phase to single-phase matrix converter circuit, which improves the voltage transfer ratio. A complementary control method was employed for the back-stage full-bridge circuit, which is simple and easy to implement. A phase-shift control method was used to coordinate the front-stage and the back-stage. By coordinating the pulse width distribution of the front-stage and the back-stage, the zero voltage switching (ZVS) commutation of all switching devices was achieved under a simple two-step commutation of bidirectional switches in the matrix converter. Simulation and experimental results show that, the three-phase grid-side currents are balanced and the total harmonic distortion (THD) is less than 3%, the input power factor is close to unity, the dc output voltage and current are constant with small ripples, and all bidirectional switching devices and common switching devices can operate with ZVS. The converter efficiency is greater than 94.5% within wide load range (10%~100%), and the maximum efficiency reaches up to 97.74%. Hence, these results verified that the isolated AC-DC matrix converter features stable bidirectional power transfer, good input/output performance and high efficiency based on ZVS under the proposed modulation strategy. © 2021 Chin. Soc. for Elec. Eng.

引用

页码：2474 / 2483

页数：9

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