Swinging bus technique for ripple current elimination in Fuel Cell power conversion

A swinging bus scheme is investigated in this work to eliminate undesirable low frequency ripple current reflection in Fuel Cells (FCs). The swinging bus is thoroughly characterized under various loading conditions to establish a behavioral model. As a result, a general control scheme and signal processing for buck- and boost- derived power converters is obtained. A digital filter in the form of a Moving Averaging Filter (MAF) proves to be a fundamental component of the control loop, a significant practical advancement in control for low frequency ripple elimination. A formal mathematical demonstration is included and experimental results are presented to validate the technique and illustrate its benefits.