Dc microgrid droop control based on battery state of charge balancing

Document Type

Conference Proceeding

Publication Date



Department of Mechanical Engineering-Engineering Mechanics


© 2016 IEEE. This paper presents a load sharing method applied in a distributed micro grid system. The goal of this method is to balance the state-of-charge (SoC) of each parallel connected battery and make it possible to detect the average SoC of the system by measuring bus voltage for all connected modules. In this method the reference voltage for each battery converter is adjusted by adding a proportional SoC factor. Under such setting the battery with a higher SoC will output more power, whereas the one with lower SoC gives out less. Therefore the higher SoC battery will use its energy faster than the lower ones, and eventually the SoC and output power of each battery will converge. Since the reference voltage is related to SoC status, the information of the average SoC in this system could be shared for all modules by measuring bus voltage.

Publication Title

2016 IEEE Power and Energy Conference at Illinois, PECI 2016