Adaptive control of interleaved boost converter for fuel cell energy

The problem of controlling interleaved dc-dc boost converters (IBC) is addressed for fuel cell (FC) energy generation system. The aim is to ensure output voltage regulation and perfect current sharing, between different branches, despite changes of the converter power load. The problem is dealt with using an adaptive control strategy, based on large-signal nonlinear model of the whole FC-IBC system, involving online estimation of the uncertain load. The difficulty of the present adaptive control problem lies in the fact that the uncertain load comes not only in the model but also in the current reference signal. Therefore, the perfect current sharing requirement cannot be met unless the online load estimate converges to its true value. It is formally shown that the estimate actually converges to its true value ensuring the achievement of all desired control performances.