Abstract

The input current ripple generated by DC-DC converter is one of main factors affecting fuel cells lifetime in fuel cell vehicle. Interleaved boost converter (IBC) can reduce the current ripple by increasing number of phases, but which will aggrandize the size of DC-DC converter. Therefore, a filter inductor is added to the input side of IBC, and this novel structure can effectively reduce the fuel cell current ripple. However, the interleaved boost converter with added inductor (IBCAI) has stability problem if the controller parameter and inductance are not selected properly. This article establishes the transfer function of IBCAI by state space equation, and determines the controller parameter and inductance by amplitude margin and phase margin. The simulation results based on these parameters show that IBCAI can work stably and maintain the current ripple of fuel cell within 0.2 A under different load conditions. According to the experimental data, it can be found that IBCAI can control the fuel cell current ripple within 1 A, which is much smaller than that under IBC.

中文翻译：

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燃料电池低纹波DC-DC转换器稳定性分析

摘要

DC-DC转换器产生的输入电流纹波是影响燃料电池汽车燃料电池寿命的主要因素之一。交错式升压转换器 (IBC) 可以通过增加相数来减少电流纹波，但这会增大 DC-DC 转换器的尺寸。因此，在IBC的输入端增加了一个滤波电感，这种新颖的结构可以有效降低燃料电池电流纹波。但是，如果控制器参数和电感选择不当，则带有附加电感器的交错式升压转换器（IBCAI）存在稳定性问题。本文通过状态空间方程建立IBCAI的传递函数，并通过幅度裕度和相位裕度确定控制器参数和电感。基于这些参数的仿真结果表明，IBCAI在不同负载条件下均能稳定工作并将燃料电池的电流纹波保持在0.2A以内。根据实验数据可以发现，IBCAI可以将燃料电池电流纹波控制在1A以内，远小于IBC下的。