Investigation of Stability Issues in Droop-Controlled DC Micro-grids with Intermediate Bus Architecture

Inhalt:
DC microgrids for stationary and mobile applications gain growing attention in the field of scientific and industrial research. Despite undisputed advantages in terms of efficiency and operating cost, new technical challenges arise, out of which system stability under all operating conditions is of crucial importance for uninterruptible service. The research work at hand explores possible stability issues in a typical droop-controlled DC microgrid utilizing an intermediate bus architecture that are linked to the control loop setup of its power source converters and the amount and distribution of energy storage elements within the distribution system. Based on considerations for possible control loop implementations, recommendations for stable, reconfigurable, and highly reliable DC power systems are outlined.