Large Step Ratio Input-Series–Output-Parallel Chain-Link DC–DC Converter
Large Step Ratio Input-Series–Output-Parallel Chain-Link DC–DC Converter
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DOI：
10.1109/tpel.2018.2861702
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发表时间：
2019-05
影响因子：
6.7
通讯作者：
Xiaotian Zhang;Mofan Tian;Xin Xiang;J. Pereda;T. Green;Xu Yang
中科院分区：
文献类型：
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作者：
Xiaotian Zhang;Mofan Tian;Xin Xiang;J. Pereda;T. Green;Xu Yang
高压大功率DC-DC变换是直流输电、配电和发电的关键，这就要求直流变压器结构紧凑、效率高、步进比大。介绍了一种由多个高步比变流器单元组成的输入-串联-输出-并联的DC-DC变流器。每个子转换器单元都是一个隔离的模块化DC-DC转换器，带有一堆半桥单元，将DC降低到低电压水平。该变压器提供电流隔离和额外的阶跃比。由于串并联结构、模块单元和隔离变压器的组合，该转换器实现了较大的步进比。在一个30千伏-1千伏、1兆瓦的应用中，对所提出的DC-DC转换器进行了分析，讨论了其运行性能、权衡、功率效率和元件的选择。最后，通过实验室小试样机对该转换器进行了验证。
High-voltage and high-power dc–dc conversion is key to dc transmission, distribution, and generation, which requires compact and efficient dc transformers with large step ratios. This paper introduces a dc–dc converter with the input-series–output-parallel arrangement of multiple high step ratio subconverter units. Each subconverter unit is an isolated modular dc–dc converter with a stack of half-bridge cells chopping the dc down to low voltage level. The transformer provides galvanic isolation and additional step ratio. The converter achieves a large step ratio due to the combination of the series-parallel configuration, the modular cells, and the isolation transformer. The proposed dc–dc converter is analyzed in a 30 kV–1 kV, 1-MW application to discuss the operation performance, tradeoffs, power efficiency, and selection of components. Finally, the converter is validated through a laboratory downscaled prototype.