燃料电池电力变换器的低频纹波电流抑制策略

燃料电池电力变换器通常包括直 — 直及直 — 交2级变换器，而直 — 交变换器通常会产生2倍于输出频率的纹波电流并反向传播到燃料电池输出端。低频纹波电流会造成燃料电池系统的燃料浪费，减小电力变换器的输出能力，更重要的是减少燃料电池堆寿命，所以必须得到有效抑制。文中论述了燃料电池电力变换器纹波电流产生的机理及传播途径。在此基础上提出了一种能有效抑制电流纹波的新型控制器，并应用在一个1.2 kW的质子交换膜燃料电池电力变换器样机上。实验证明该控制器能有效抑制电流纹波产生，并实现了电力变换器的指令电流控制。

A Scheme for Suppressing Low Frequency Ripple Current in the Fuel Cell Power Conditioning System

The power conditioning system(PCS) of the proton exchange membrane fuel cell(PEMFC) for residential application usually contains a two-stage converter of DC-DC converter and power grid connection DC-AC inverter.The inverter tends to draw an AC ripple current at twice the output frequency.The low frequency ripple current should be effectively suppressed since it will waste the fuel,reduce the output capacity of the fuel cell system and shorten the fuel cell's life span.Based on a discussion of the mechanism of generation and propagation channels of the ripple current,a novel ripple current suppressing PCS controller is proposed and applied to a 1.2 kW PEMFC prototype.The experimental results show that the ripple current is effectively suppressed with the new controller and the PCS instruction current control achieved.