Stability analysis of a Networking DC microgrid with distributed droop control and CPLs

CARNAGHI, MARCO; CERVELLINI, PAULA; JUDEWICZ, MARCOS; GARCIA RETEGUI, ROGELIO; FUNES, MARCOS

IEEE LATIN AMERICA TRANSACTIONS

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Lugar: New York; Año: 2023 vol. 21

1548-0992

Networking direct current microgrids (DCMGs) have gained interest in the pursuit of achieving higher integration of renewable energy sources (RESs) and improving system resilience and reliability. The highly cooperative nature of these MGs is an advantage in order to maximize the RESs utilization and minimize grid power demand, but represents a major challenge in ensuring stable and robust operation in face of the marked load fluctuations. Overvoltages and overcurrents,among other phenomena related to system stability, deteriorate the power quality and can be prevented or addressed with proper analysis. In this regard, numerous research studies havepresented proposals related to the achievment of an optimal power distribution among the individual DCMGs of a networking DCMG. However, the stable operation of these MGs still requiresfurther analysis to reach the same level of understanding accomplished in other topologies. Therefore, in this paper, a stability analysis for a networking DCMG is presented. This analysis includes the modeling of the system considering a distributed control strategy and the presence of uncertain active loads, and the subsequent formulation of sufficient conditions of load and generation power for robust stability of the DCMG. Finally, circuital simulations are contrasted with the results of the presented stability analysis to evaluate the correspondence between both and draw conclusions regarding the microgrid representation and the tunning of the controller’s gains and parameters.