电解槽用小型直流电容三相并网电源的建模与控制

L. Torok, L. Mathe, C. Nielsen, S. Munk‐Nielsen
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引用次数: 3

摘要

如今,由于燃料电池可再生能源发电对氢形式的能量存储的高需求,电解槽变得越来越有趣。这种系统的电源设计是复杂的,特别是当直流链路电容减小时。用简化的电源开关模型代替复杂的电源开关模型,可以更好地观察系统动力学。由小直流链路电容和栅极侧电感引起的谐振更容易分析。为了减小直流链路电压纹波对负载电压和电流的影响,提出了一种基于系统简化模型的前馈补偿方法。该方法使用锁频环(FLL)来估计直流链路电压纹波的基元分量。基于重构整流元件,产生了一个新的前馈补偿信号,从而抵消了前馈回路中电网电感和直流电容引入的谐振。理论工作已通过电解槽用5kw直流电源的实验验证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Modelling and control of three-phase grid-connected power supply with small DC-link capacitor for electrolysers
These days electrolyzers are becoming more and more interesting due to the high demand for energy storage in form of hydrogen for renewable power generation using fuel cells. The design of a power supply for such a system is complex especially when the DC-link capacitance is reduced. By substituting the complex switching model of the power supply with a simplified one, the system dynamics can be better observed. The resonances caused by the small DC link capacitor and grid side inductance can be easier analyzed. A feed forward compensation method is proposed based on the simplified model of the system in order to minimize the effects of the DC link voltage ripple on the load voltage and current. The proposed method uses Frequency-Locked Loop (FLL) for estimating the fundamental component of the DC-link voltage ripple. Based on the reconstructed rectifier component a new feed-forward compensation signal is created, canceling in such a way the resonance introduced by the grid inductance and the DC-link capacitor from the feed-forward loop. The theoretical work has been validated through experiments on a 5 kW DC power supply used for electrolyser application.
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