用于可逆固体氧化物燃料电池的多端口双向功率转换系统

Xiang Lin, K. Sun, Jin Lin, Zhe Zhang, W. Kong
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引用次数: 14

摘要

可逆固体氧化物燃料电池/电解槽(SOFC/EC)技术是一种极具吸引力的高能量存储系统解决方案。然而,单片SOFC/EC堆叠的电压范围大、功耗低,给SOFC/EC存储系统的功率转换系统设计带来了困难。本文提出了一种新的电力多端口双向转换系统,将多个SOFC/EC栈与公用电网连接起来。转换器结构包含一个多端口结构,具有两个转换级。首先分析了两级转换结构,以解决SOFC/EC堆叠电压的大范围问题。采用高降压CLLC谐振变换器实现高效的电压变换,并采用交错降压变换器作为第二级,实现对SOFC/EC堆叠电压的大范围控制。本文介绍了多端口结构的推导,并讨论了所提出的转换系统的控制策略。所提出的转换系统能够灵活地控制多个SOFC/EC堆栈的应用。通过小尺寸样机的实验验证了该系统的特性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Multi-Port Bidirectional Power Conversion System for Reversible Solid Oxide Fuel Cell Applications
Reversible Solid Oxide Fuel Cell/Electrolyser Cell (SOFC/EC) technology is an attractive solution for high energy storage system in the utility grid. However, the wide range of voltage and low power of single SOFC/EC stack make it difficult to design the power conversion system for SOFC/EC storage system. In this paper, a new power multi-port bidirectional conversion system is proposed to connect multiple SOFC/EC stacks with the utility grid. The converter structure contains a multi-port structure with two conversion stages. The two-stage conversion structure is first analyzed to address the wide-range of SOFC/EC stack’s voltage. The high-step-down CLLC resonant converter is implemented to achieve efficient voltage transformation, and the interleaved buck converter is employed as the second stage to control the voltage of SOFC/EC stack within a wide range. The derivation of the multi-port structure is introduced, and the control strategy of proposed conversion system is also discussed in this paper. The proposed conversion system enables a flexible control for the application of multiple SOFC/EC stacks. The feature of the proposed system is verified by the experiments from a down-scale prototype.
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