Dynamic Droop Control in Direct Current Microgrid to Improve Voltage Regulation and Current Sharing

The DC microgrid is superior to the AC microgrid in many ways, including high efficiency, dependability, power quality, and more. The main problems in the DC microgrid are keeping constant DC voltage and proportional load sharing of the converters. As described in the previous studies, the droop control is a standard method to solve the problem. However, the previous droop control techniques used fixed droop resistance, which cannot be used for all loading conditions. Because of unequal line resistance and other factors, when, the voltage deviation decreases, the current sharing error between the sources increases, and vice versa. This research presents a new dynamic droop control approach to solve the previous droop controller drawbacks. This method takes the actual converter current and voltage values to calculate a new dynamic droop resistance in every operation time of the DC microgrid. The efficacy of this innovative dynamic droop control system is evaluated through both MATLAB simulations and real-time simulator experiments.