Mitigation of Low-Frequency Current Ripple in Fuel-Cell Inverter Systems Through Waveform Control
Mitigation of Low-Frequency Current Ripple in Fuel-Cell Inverter Systems Through Waveform Control
复制标题
DOI：
10.1109/tpel.2012.2205407
复制
发表时间：
2013-02
影响因子：
6.7
通讯作者：
G. Zhu;Siew-Chong Tan;Yu Chen;C. Tse
中科院分区：
文献类型：
--
作者：
G. Zhu;Siew-Chong Tan;Yu Chen;C. Tse
包括单相dc/ac逆变器的燃料电池电力系统以燃料电池输出频率的两倍汲取低频ac涟漪电流。这样的100/120 Hz涟漪电流可能在燃料电池系统中产生不稳定性，降低其效率，并缩短燃料电池堆的寿命。本文提出了一种波形控制方法，可以减轻这种低频涟漪电流被从燃料电池，而燃料电池系统提供交流电源的负载通过差分逆变器。这是可能的，因为利用所提出的解决方案，输出交流功率的脉动分量（交流涟漪电流的原因）将主要由差分逆变器的两个输出电容器提供，而平均直流输出功率由燃料电池提供。理论分析，仿真和实验结果提供了解释的操作和展示的方法的性能。实验结果表明，该方案在不增加硬件的情况下，可以有效地抑制电流涟漪，并获得高质量的输出电压。该解决方案的应用针对需要电流涟漪缓解的系统，例如用于消除光伏和LED系统中的电解电容器。
Fuel-cell power systems comprising single-phase dc/ac inverters draw low-frequency ac ripple currents at twice the output frequency from the fuel cell. Such a 100/120 Hz ripple current may create instability in the fuel-cell system, lower its efficiency, and shorten the lifetime of a fuel cell stack. This paper presents a waveform control method that can mitigate such a low-frequency ripple current being drawn from the fuel cell while the fuel-cell system delivers ac power to the load through a differential inverter. This is possible because with the proposed solution, the pulsation component (cause of ac ripple current) of the output ac power will be supplied mainly by the two output capacitors of the differential inverter while the average dc output power is supplied by the fuel cell. Theoretical analysis, simulation, and experimental results are provided to explain the operation and showcase the performance of the approach. Results validate that the proposed solution can achieve significant mitigation of the current ripple as well as high-quality output voltage without extra hardware. Application of the solution is targeted at systems where current ripple mitigation is required, such as for the purpose of eliminating electrolytic capacitor in photovoltaic and LED systems.