Low Frequency Current Ripple Reduction Technique with Active Control in a Fuel Cell Power System with Inverter Load
Low Frequency Current Ripple Reduction Technique with Active Control in a Fuel Cell Power System with Inverter Load
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DOI：
10.1109/tpel.2007.900594
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发表时间：
2007-07
期刊：
影响因子：
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通讯作者：
Changrong Liu;J. Lai
中科院分区：
文献类型：
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作者：
Changrong Liu;J. Lai
包含单相DC-AC逆变器的燃料电池电力系统往往会以两倍于输出频率的频率产生交流纹波电流。这种纹波电流可能会缩短燃料电池的寿命，并由于滞后效应而使燃料效率恶化。最明显的影响是燃料电池控制器在瞬时过电流条件下跳闸，导致燃料电池输出能力下降。对纹波电流的传播路径进行了分析，推导了其交流线性化模型。对无源储能元件的等效电路模型和纹波电流抑制进行了仿真和实验验证。然后提出了一种先进的有源控制技术，在DC-DC转换器中加入电流控制环以减小纹波。采用多相DC/DC转换器和全桥DC-AC逆变器的质子交换膜型燃料电池，通过计算机仿真和硬件实验验证了所提出的有源消纹方法。提供了开环、单电压环和所提出的有源电流环控制的测试结果，以供比较
A fuel cell power system that contains a single-phase dc-ac inverter tends to draw an ac ripple current at twice the output frequency. Such a ripple current may shorten fuel cell life span and worsen the fuel efficiency due to the hysteresis effect. The most obvious impact is it tends to reduce the fuel cell output capacity because the fuel cell controller trips under instantaneous over-current condition. In this paper, the ripple current propagation path is analyzed, and its linearized ac model is derived. The equivalent circuit model and ripple current reduction with passive energy storage component are simulated and verified with experiments. An advanced active control technique is then proposed to incorporate a current control loop in the dc-dc converter for ripple reduction. The proposed active ripple reduction method has been verified with computer simulation and hardware experiment with a proton exchange membrane type fuel cell using a multiphase dc/dc converter along with a full-bridge dc-ac inverter. Test results with open loop, single voltage loop, and the proposed active current-loop control are provided for comparison