Current-sharing and DC bus voltage control system design of paralleled DC-DC converters

The paper is dedicated to problem of current sharing of paralleled DC-DC converters in order to provide balanced loading of DC-DC converters with common DC bus. Cascaded control system structure is considered where, at first, an inner multivariable current proportional controller is designed and then, at second, an outer voltage integral controller is constructed in order to keep the desired output voltage of the DC bus. Simulation results of the system with the three paralleled DC converters equipped by the pulse-width modulators are presented.