Isolated Bidirectional Grid-Tied Three-Phase AC–DC Power Conversion Using Series-Resonant Converter Modules and a Three-Phase Unfolder
Isolated Bidirectional Grid-Tied Three-Phase AC–DC Power Conversion Using Series-Resonant Converter Modules and a Three-Phase Unfolder
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DOI：
10.1109/tpel.2017.2652477
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发表时间：
2017-01
影响因子：
6.7
通讯作者：
W. Chen;R. Zane;L. Corradini
中科院分区：
文献类型：
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作者：
W. Chen;R. Zane;L. Corradini
功率双向变换器用于将储能与直流和交流配电网相结合。由多个双桥串联谐振变换器（DBSRC）模块组成的模块化双向dc-dc变换器系统可以重新配置以扩展系统的工作范围。本文提出了一种模块化三相交直流变换器系统，通过在两个DBSRC模块的串联输出上增加一个线频解压缩器。DBSRC模块被控制输出时变电流，然后通过unfolder重构成正弦交流电流。与采用dc-dc变换器和双电平电压源逆变器的传统两级系统相比，DBSRC-unfolder系统具有更小的直流链路电容、可忽略的unfolder开关损耗、更小的线路滤波器尺寸和更快的动态响应。在1千瓦的实验样机上验证了系统的运行和性能。
Power-bidirectional converters are used to integrate energy storage with both dc and ac distribution grids. A modular bidirectional dc–dc converter system consisting of multiple dual-bridge series resonant converter (DBSRC) modules can be reconfigured to extend the system operating range. This paper proposes a modular three-phase ac–dc converter system by adding a line-frequency unfolder to series-connected outputs of two DBSRC modules. The DBSRC modules are controlled to output time-varying currents, which are then reconstructed into sinusoidal ac currents by the unfolder. Compared with a conventional two-stage system with a dc–dc converter and a two-level voltage-source inverter, the DBSRC–unfolder system has smaller dc-link capacitance, negligible unfolder switching loss, reduced line filter size, and faster dynamic response. The system operation and performance are verified on a 1-kW experimental prototype.