Design of a Modular, High Step-Up Ratio DC-DC Converter for HVDC Applications Integrating Offshore Wind Power
Design of a Modular, High Step-Up Ratio DC-DC Converter for HVDC Applications Integrating Offshore Wind Power
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DOI：
10.1109/tie.2015.2510975
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发表时间：
2016-04-01
影响因子：
7.7
通讯作者：
Finney, Stephen J.
中科院分区：
文献类型：
--
作者：
Hu, Yihua;Zeng, Rong;Finney, Stephen J.
大功率、高电压增益的直流变换器是海上风电高压直流输电的关键。本文提出了一种矩阵式Transformer结构的隔离式超高升压DC-DC变换器。功率单元采用反激-正激变换器，副边采用矩阵连接，提高了功率水平和容错能力。由于转换器的模块化结构，开关器件上的应力减小，Transformer的尺寸也减小。拟议的拓扑结构可以在列交错模式、行交错模式和混合工作模式下运行，以处理来自风电场的变化能量。此外，容错操作也实现了在几个故障情况。一个400 W的直流-直流变换器与四个单元的开发和实验测试，以验证所提出的技术，可应用于大功率高压直流输电。
High-power and high-voltage gain dc-dc converters are key to high-voltage direct current (HVDC) power transmission for offshore wind power. This paper presents an isolated ultra-high step-up dc-dc converter in matrix transformer configuration. A flyback-forward converter is adopted as the power cell and the secondary side matrix connection is introduced to increase the power level and to improve fault tolerance. Because of the modular structure of the converter, the stress on the switching devices is decreased and so is the transformer size. The proposed topology can be operated in column interleaved modes, row interleaved modes, and hybrid working modes in order to deal with the varying energy from the wind farm. Furthermore, fault-tolerant operation is also realized in several fault scenarios. A 400-W dc-dc converter with four cells is developed and experimentally tested to validate the proposed technique, which can be applied to high-power high-voltage dc power transmission.