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Study of a multiphase interleaved step-up converter for fuel cell high power applications

机译：用于燃料电池高功率应用的多相交错式升压转换器的研究

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摘要

This paper presents a study of a high power dc distributed system supplied by a fuel cell generator. A proposed parallel power converter with interleaving algorithm is chosen to boost a low dc voltage of fuel cell to a dc bus utility level. The present interleaved step-up converters are composed of two and four identical boost converters connected in parallel. Converters are controlled by interleaved switching signals, which have the same switching frequency and the same phase shift. By virtue of paralleling the converters, the input current can be shared among the cells or phases, so that high reliability and efficiency in power electronic systems can be obtained. In addition, it is possible to improve the system characteristics such as maintenance, repair, fault tolerance, and low heat dissipation. During the past decade, power electronics research has focused on the development of interleaved parallel converters. For an interleaving technique with a real fuel cell source, this work is the first presentation; it is not just a fuel cell simulation. So, the design and experimental verification of 1.2-kW prototype converters at a switching frequency of 25 kHz connected with a Nexa? PEM fuel cell system (1.2-kW, 46-A) in a laboratory is presented. Experimental results corroborate the excellent system performances. The fuel cell ripple current can be virtually reduced to zero. As a result, the fuel cell mean current is nearly equal to the fuel cell rms current.
机译：本文介绍了由燃料电池发电机提供的高功率直流分布式系统的研究。选择一种采用交错算法的并行功率转换器，以将燃料电池的低直流电压提升到直流总线实用水平。本交错式升压转换器由并联连接的两个和四个相同的升压转换器组成。转换器由交织的开关信号控制，该开关信号具有相同的开关频率和相同的相移。通过使转换器并联，可以在单元或相之间共享输入电流，从而可以在电力电子系统中获得高可靠性和效率。另外，可以改善系统特性，例如维护，维修，容错和低散热。在过去的十年中，电力电子学的研究重点是交叉并行转换器的开发。对于具有真实燃料电池源的交错技术，这项工作是首次展示。这不仅仅是燃料电池模拟。那么，在Nexa连接的25 kHz开关频率下1.2 kW原型转换器的设计和实验验证？介绍了实验室中的PEM燃料电池系统（1.2 kW，46-A）。实验结果证实了出色的系统性能。燃料电池的纹波电流实际上可以降低到零。结果，燃料电池的平均电流几乎等于燃料电池的均方根电流。

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