Experimental verification of the thermal droop load sharing technique

As the demand for reliable power systems comprised of parallel-connected converter units continue to increase the need for optimized, yet simple, load sharing techniques increase accordingly. This paper examines the traditional series droop resistor technique and its reliability optimized counterpart the thermal droop load sharing. The former technique ensures an approximate load sharing among the individual converters by distributing an equal current throughout the system while the latter technique uses temperature information to adjust the individual converter currents, hence intentionally creating an unequal load sharing. Following an introduction to the thermal droop load sharing technique, a set of measurements of both techniques is presented. These verify that the thermal droop load sharing technique has a positive impact on the overall system