Control system design of a stacked-interleaved buck converter for electrolysers

The design of a multi-loop control system for a Stacked Interleaved Buck Converter (SIBC) is presented in this paper. Starting from the SIBC model, which reveals a significant coupling among the several voltage and current variables, a nested control loop structure has been defined to regulate the SIBC output voltage, branch currents and voltages simultaneously. The proposed design approach is based on the dynamic decoupling between the different control loops, which has been achieved by an appropriate management of SIBC model, as well as by introducing suitable auxiliary variables. The effectiveness of the proposed control system has been verified in simulations, which regards the tracking of a given reference output voltage profile in case of different and variable output currents.