A multi-phase stacked interleaved buck converter (SIBC) is suitable for large-power water electrolysis applications due to its merits of high current output capability and zero output current ripple. However

the auxiliary converter used to compensate for the current ripple still has to withstand high voltage stress. This paper proposes a new multi-phase SIBC applied in the multicarrier energy system integrating electricity

heat

and hydrogen. A resistor-capacitor voltage divider is used to provide the input voltage of the auxiliary converter and as a heater for the thermal loads. Thus

the voltage stress of the auxiliary converter can be reduced at a low cost

and the size of the filter inductor can be reduced. With accurate voltage and current analysis and appropriate parameter design

the voltage stresses of both the switches and capacitors in the auxiliary converter can be further limited within an expected range. The experimental results verify the correctness of the topology

modulation

analysis

and design methods. A comparison with the conventional method is made in terms of cost

volume

and efficiency to show the advantages of the proposed method.